JP7834278B2 - Labels and containers - Google Patents

Description

This invention relates to a novel label.
Furthermore, the present invention relates to a novel container that uses this label.

Containers manufactured using in-mold molding have the label and the plastic container body integrally molded by injection molding. Even when decoration is required, secondary processing is unnecessary, and the container has printability, allowing for a wide printing area.

From a recycling perspective, it is preferable to remove the label from in-mold molded containers. Labels containing aluminum or other materials may be used to ensure barrier properties against oxygen, light, etc. In cases where a label made of a different material than the container body is used, recycling is impossible if the label remains attached to the container. Such containers must be treated as industrial waste, incurring disposal costs.

Various types of containers with in-mold labels have been disclosed.
In an in-mold label container in which the label and the container body are integrally molded using injection resin, a label-attached container has been reported in which the length of the label wound around the circumference of the container body is made longer than the circumference of the container body to create a label overlapping portion, and this portion is formed into a non-adhesive portion and an adhesive portion, and is also decorated (see, for example, Patent Document 1).

A container in which the container body and label are integrally molded by injection molding, wherein the length of the label is longer than the circumference of the side wall of the container body, and an overlapping portion of the label is provided, and an adhesive layer is provided between the overlapping portions, has been reported (see, for example, Patent Document 2).

A heat-adhesive film is used as the base film, and a release agent layer is applied to the back of the portion that will become the label's tear-off piece. A label has been reported in which the tear-off piece adheres to the container surface but is not adhesive, allowing it to be easily peeled off and torn with a fingertip (see, for example, Patent Document 3).

Japanese Utility Model Publication No. 5-081036 Japanese Patent Publication No. 2006-027705 Japanese Utility Model Publication No. 6-076972

However, the aforementioned Patent Documents 1 to 3 have the following problems.
In the container described in Patent Document 1, the label is made of water-resistant paper and synthetic paper, and the labels are not adhered to each other in the overlapping areas. Adhering the labels requires processing of the labels, which presents problems in terms of cost and mass production.

In the container described in Patent Document 2, adhesive must be applied to the labels in order to bond them together, which presents problems in terms of cost and mass production. Furthermore, in areas where the labels overlap, the adhesive strength is insufficient, leading to the labels easily peeling off. Additionally, considerable force is required to remove the labels from the container body, making removal difficult.

In the label described in Patent Document 3, a perforated line is provided between the main body of the label and the label's tear-off piece. Therefore, while the tear-off piece can be peeled off the plastic container, there is a problem in that the main body of the label cannot be peeled off.

Therefore, there is a need for the development of new labels that can solve these problems.
Furthermore, there is a need for the development of new containers that utilize this label.

This invention has been made in view of these problems and aims to provide a novel label.
Furthermore, the present invention aims to provide a novel container that uses this label.

To solve the above problems and achieve the objectives of the present invention, the label of the present invention is characterized by being a label laminated with three or more layers, wherein the inner layer is made of a heat-adhesive resin, and the heat-adhesion temperature of the heat-adhesive resin is within the range of 70 to 115°C.

The label of the present invention is characterized by being a laminated label of three or more layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, and the heat-adhesion temperature of the heat-adhesive resin is within the range of 70 to 115°C.

The label of the present invention is a label comprising three or more laminated layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, the heat-adhesion temperature of the heat-adhesive resin is in the range of 70 to 115°C, the label has a peel-off tab on one side edge, and a release layer is formed on the outer surface of the outer layer near the other side edge of the label.

The label of the present invention is a label comprising three or more laminated layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, the heat-adhesion temperature of the heat-adhesive resin is in the range of 70 to 115°C, the label has a peel-off tab on one side, and a release layer is formed on the peel-off tab on the inner surface of the inner layer.

The label of the present invention is a label having any of the above configurations, characterized in that it has a notch at the upper end of one side of the label.

The container of the present invention is a container in which a label having any of the above configurations is in-mold molded, and is characterized by having an overlapping portion where one side of the label rests on the other side of the label.

The container of the present invention is a container in which a label having the above configuration is in-mold molded, and has an overlapping portion where one side of the label rests on the other side of the label, and the peel-off piece is located on the release layer.

The container of the present invention has a flange portion at the upper end of the side wall, a label of any of the above configurations is in-mold molded onto the side wall, one side of the label has an overlapping portion where it rests on the other side, and a notch is present in the flange portion.

The present invention provides the following effects:

The label of the present invention is a label laminated with three or more layers, wherein the inner layer is made of a heat-adhesive resin, and the heat-adhesion temperature of the heat-adhesive resin is within the range of 70 to 115°C, thus providing a novel label.

The label of the present invention is a label laminated with three or more layers, where the outer layer and inner layer are made of a heat-adhesive resin, and the heat-adhesion temperature of the heat-adhesive resin is within the range of 70 to 115°C, thus providing a novel label.

The label of the present invention is a label laminated with three or more layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, the heat-adhesion temperature of the heat-adhesive resin is in the range of 70 to 115°C, the label has a peel-off tab on one side edge, and a release layer is formed on the outer surface of the outer layer near the other side edge of the label, thereby providing a novel label.

The label of the present invention is a label laminated with three or more layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, the heat-adhesion temperature of the heat-adhesive resin is in the range of 70 to 115°C, and the label has a peel-off tab on one side, and a release layer is formed on the inner surface of the inner layer on the peel-off tab, thereby providing a novel label.

The label of the present invention is one of the labels with the above-described configurations, having a notch at the upper end of one side of the label, thus providing a novel label.

The container of the present invention is a container in which a label with any of the above configurations is in-mold molded, and has an overlapping portion where one side of the label rests on the other side of the label, thus providing a novel container.

The container of the present invention is a container in which the label with the above configuration is in-mold molded, and has an overlapping portion where one side of the label rests on the other side of the label, and the peel-off piece is located on the release layer, thus providing a novel container.

The container of the present invention has a flange portion at the upper end of the side wall, and a label of one of the above configurations is in-mold molded onto the side wall. The label has an overlapping portion where one side edge rests on the other side edge, and a notch exists in the flange portion. Therefore, a novel container can be provided.

This is a diagram showing the outer surface of the label. This is a diagram showing the inside of the label. This is a cross-sectional view of the label along line A-A' in Figure 1. This is a magnified view of portion a of the label in Figure 3. This is a perspective view of the container. This is a front view of the container. This is a cross-sectional view of the container along line B-B' in Figure 6. This is an enlarged view of portion b in Figure 7. This is a bottom view of the container. This is an enlarged view of the upper portion in Figure 9. This is a cross-sectional view taken along line C-C' in Figure 10. This is a cross-sectional view taken along line D-D' in Figure 10. This is a diagram showing the outer surface of the label. This is a diagram showing the inside of the label. This is a cross-sectional view of the label along line E-E' in Figure 13. This is a perspective view of the container. This is a front view of the container. Figure 17 is an enlarged front view of the container. This is a cross-sectional view of the container along line F-F' in Figure 17. This is an enlarged view of portion c in Figure 19. This is a bottom view of the container. This is an enlarged view of the upper portion in Figure 21. This is a cross-sectional view taken along line G-G' in Figure 22. This is a cross-sectional view taken along line H-H' in Figure 22. This is a diagram illustrating the process of peeling off a label. This is a diagram illustrating the process of peeling off a label. This is a diagram illustrating the process of peeling off a label. This is a diagram illustrating the process of peeling off a label. This is a diagram showing the outer surface of the label. This is a front view of the container. Figure 30 is an enlarged front view of the central portion of the container. This is a diagram showing the outer surface of the label. This is a diagram showing the inside of the label. This is a cross-sectional view of the label along line I-I' in Figure 32. This is a perspective view of the container. This is a front view of the container. Figure 36 is an enlarged front view of the container. This is a cross-sectional view of the container along line J-J' in Figure 36. This is an enlarged view of portion d in Figure 38. This is a diagram illustrating the process of peeling off a label. This is a diagram illustrating the process of peeling off a label. This is a diagram illustrating the process of peeling off a label. This is a diagram illustrating the process of peeling off a label.

A description of an embodiment for carrying out the first invention relating to labels and containers will be provided.

First, the label of the present invention will be explained using Figures 1 to 4.
The label of the present invention is a label made of three or more layers, wherein the inner layer is made of a heat-adhesive resin, and the heat-adhesion temperature of the heat-adhesive resin is in the range of 70 to 115°C.

The label of the present invention is a label comprising three or more laminated layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, and the heat-adhesion temperature of the heat-adhesive resin is within the range of 70 to 115°C.

Figure 1 shows the outer surface 11 of label 1. Here, label 1 is a component to be in-mold molded into a container (described later). The outer surface 11 of label 1 is the surface that becomes the outside of the container when label 1 is in-mold molded into the container.

The upper edge 13 of label 1 is the edge that will be above the side wall of the container (described later) when label 1 is in-mold molded into the container. The lower edge 14 of label 1 is the edge that will be below the side wall of the container when label 1 is in-mold molded into the container.

Figure 2 shows the inner surface 12 of label 1. Here, the inner surface 12 of label 1 is the surface that becomes the inside of the container when label 1 is in-mold molded into the container.

Figure 3 is a cross-sectional view of label 1 along line A-A' in Figure 1. Figure 4 is an enlarged view of portion a of label 1 in Figure 3.

As shown in Figures 3 and 4, label 1 consists of a three-layer structure: an outer layer 21, an intermediate layer 22, and an inner layer 23.

Here, the outer layer 21 is made of a heat-adhesive resin. The heat-adhesive resin is preferably polypropylene (PP) or the like.

The thermal bonding temperature of the heat-bonding resin is preferably within the range of 70 to 115°C. Furthermore, it is even more preferable that the thermal bonding temperature of the heat-bonding resin is within the range of 75 to 109°C.

A heat bonding temperature of 70°C or higher has the advantage of allowing the heat-bonding resin to withstand the temperature of the molten resin during injection molding, thus preventing the formation of air bubbles. This effect becomes even more pronounced at a heat bonding temperature of 75°C or higher.

A key advantage of a thermal bonding temperature of 115°C or lower is that the thermal bonding resin melts due to the temperature of the molten resin during injection molding, resulting in stronger adhesion. This effect becomes even more pronounced when the thermal bonding temperature is 109°C or lower.

Here, the "thermal bonding temperature" (°C) is measured and defined by the following method: Two strip-shaped test pieces, 15 mm wide, are cut from a single-layer film of the thermal bonding resin. These two test pieces are stacked together to form a sample. Using a sealing device, the sample is compressed and heated in a sealing bar under conditions of 23°C and 50% RH. The heat seal temperature (°C) of this sealing bar is varied at various temperatures, and the heat seal strength of the bonded sample is measured. The heat seal temperature (°C) at which the heat seal strength of the bonded sample becomes 3 N/15 mm width is defined as the "thermal bonding temperature" (°C).
The definition of "thermal bonding temperature" (°C) described below is the same.

The numerical ranges for the thermal bonding temperatures mentioned above are merely preferred or even preferred ranges. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

The intermediate layer 22 is preferably composed of a barrier layer having barrier properties against oxygen, light, etc. Here, aluminum (Al) foil, aluminum-deposited polyethylene terephthalate (VMPET), etc., can be used as the barrier layer.

The inner layer 23 is made of a heat-adhesive resin. Here, the heat-adhesive resin is preferably polypropylene (PP) or the like.

The thermal bonding temperature of the heat-bonding resin is preferably within the range of 70 to 115°C. Furthermore, it is even more preferable that the thermal bonding temperature of the heat-bonding resin is within the range of 75 to 109°C.

A heat bonding temperature of 70°C or higher has the advantage of allowing the heat-bonding resin to withstand the temperature of the molten resin during injection molding, thus preventing the formation of air bubbles. This effect becomes even more pronounced at a heat bonding temperature of 75°C or higher.

A key advantage of a thermal bonding temperature of 115°C or lower is that the thermal bonding resin melts due to the temperature of the molten resin during injection molding, resulting in stronger adhesion. This effect becomes even more pronounced when the thermal bonding temperature is 109°C or lower.

The numerical ranges for the thermal bonding temperatures mentioned above are merely preferred or even preferred ranges. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

Label 1 is not limited to the three-layer structure described above. Label 1 may have a four-layer or more-layer structure.
Furthermore, the outer layer 21 and inner layer 23 described above can be used as the outer layer and inner layer, respectively. In addition, the intermediate layer 22 described above can be used as the intermediate layer.
The outer layer and the inner layer may contain one or more other layers besides the intermediate layer.

Next, the container of the present invention will be described with reference to Figures 5 to 12.
The container of the present invention is a container formed by in-mold molding of a label having the above-described configuration, and has an overlapping portion where one side of the label rests on the other side of the label.

Figure 5 is a perspective view of the container. Figure 6 is a front view of the container.

As shown in Figures 5 and 6, the container 3 is a resin container in which the label 1 described above is in-mold molded. The container 3 has an opening 34 at the top of the drawing. This opening 34 is circular when viewed from above the container 3. The container 3 also has an inverted truncated cone shape. At the bottom of the container 3 is a base 33 (see Figure 9). The periphery of this base 33 has a threaded portion at the bottom and a wall at the top. Here, the threaded portion and the wall together are defined as the side wall portion 31. At the upper end of the side wall portion 31 is a flange portion 32 formed horizontally in the shape of a perforated concentric disc.

An overlapping portion 15 is formed in the side wall portion 31. This overlapping portion 15 is the area where one side edge portion 16 of the label 1 overlaps the other side edge portion 17 when the label 1 is in-mold molded into the container 3. The overlapping portion 15 will be described later.
The resin portion of container 3 is preferably made of polypropylene (PP) or the like.

Figure 7 is a cross-sectional view of the container along line B-B' in Figure 6. Figure 8 is an enlarged view of portion b in Figure 7.
As shown in Figure 7, the cross-sectional shape of the side wall portion 31 is circular.

As shown in Figure 8, the container 3 has an overlapping portion 15 where one side portion 16 of the label 1 is placed on top of the other side portion 17 of the label 1.
One side 16 of label 1 is exposed to the outside of container 3. The other side 17 of label 1 is hidden beneath the one side 16 of label 1.

In the overlapping portion 15, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are bonded together. Both the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are made of a heat-bonding resin with a low heat bonding temperature. Therefore, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are fused and bonded together by the heat of the molten resin during injection molding. Note that the lower corner of the tip of the inner layer 23 of one side portion 16 is rounded and deformed by the heat of the molten resin during injection molding.

As described above, both the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are made of a heat-bonding resin with a low heat bonding temperature. Therefore, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 fuse together due to the heat of the molten resin during injection molding, resulting in the advantage of increased adhesive strength.

Furthermore, the increased adhesive strength in the overlapping portion 15 provides the following benefits.
In other words, in conventional containers, if there is no overlapping portion and there is a gap between the sides of the label, cracking of the container occurs during injection molding due to the orientation of resin molecules caused by the flow of molten resin in the gap. In contrast, in the container 3 of the present invention, by forming an overlapping portion 15, it is possible to prevent cracking of the container 3 caused by the orientation of resin molecules.

Furthermore, in conventional containers, if there is no overlapping portion and a gap exists between the sides of the label, oxygen, light, etc., can penetrate from outside the container into the interior through that gap, making it impossible to ensure barrier properties. In contrast, in the container 3 of the present invention, by forming the overlapping portion 15, barrier properties against oxygen, light, etc. can be ensured.

In Figure 8, the distance from the end 161 of one side portion 16 to the end 171 of the other side portion 17 is defined as the width m of the overlapping portion. The width m of the overlapping portion 15 is preferably at least long enough to prevent cracking of the container and to ensure barrier properties against oxygen, light, etc.

Figure 9 is a bottom view of container 3. Figure 10 is an enlarged view of the upper portion shown in Figure 9.
As shown in Figure 9, the overlapping portion 15 is the area enclosed by the end 161 of one side portion 16, the end 171 of the other side portion 17, the upper edge 13 of the label 1, and the lower edge 14 of the label 1.

As shown in Figure 10, the end 161 of one side portion 16, which is the boundary on the right side of the overlapping portion 15 in the drawing, is located on the side wall portion 31. Furthermore, the end 161 of one side portion 16 is also located on the flange portion 32.
Furthermore, the end portion 171 of the other side portion 17, which is the left-hand boundary of the overlapping portion 15 in the drawing, is located in the side wall portion 31. In addition, the end portion 171 of the other side portion 17 is also located in the flange portion 32.

Furthermore, the upper edge 13 of label 1, which is the upper boundary of the overlapping portion 15 in the drawing, is located on the flange portion 32.
Therefore, the overlapping portion 15 consists of an overlapping portion 151 in the side wall portion 31 and an overlapping portion 152 in the flange portion 32.

Figure 11 is a cross-sectional view taken along line C-C' in Figure 10. In other words, Figure 11 is a cross-sectional view taken at the end portion 161 of one side portion 16.
In the overlapping portion 151 of the side wall portion 31, the end portion 161 of one side edge portion 16 is formed on the outside of the side wall portion 31. The end face of the end portion 161 of one side edge portion 16 is visible.
Furthermore, the other side portion 17 is formed by adhering it to the inside of the end portion 161 of the other side portion 16. The cross-section of the other side portion 17 is visible.

In the overlapping portion 152 of the flange portion 32, the end 161 of one side portion 16 is formed on the outside of the flange portion 32. The end 161 of one side portion 16 is bent from the side wall portion 31 toward the flange portion 32. The end face of the end 161 of one side portion 16 is visible.
Furthermore, the other side portion 17 is formed by adhering it to the inside of the end portion 161 of the other side portion 16. The other side portion 17 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the other side portion 17 is visible.

Figure 12 is a cross-sectional view taken along the line D-D' in Figure 10. Specifically, Figure 12 is a cross-sectional view taken along the cross-sectional line D-D' passing between the end 161 of one side portion 16 and the end 171 of the other side portion 17.

In the overlapping portion 151 of the side wall portion 31, one side portion 16 is formed on the outside of the side wall portion 31. The cross-section of the one side portion 16 is visible.
Furthermore, one side portion 16 is bonded to the inside of the other side portion 17. The cross-section of the other side portion 17 is visible.

In the overlapping portion 152 of the flange portion 32, one side portion 16 is formed on the outside of the flange portion 32. The one side portion 16 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the one side portion 16 is visible.
Furthermore, one side portion 17 is bonded to the inside of the other side portion 16. The other side portion 17 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the other side portion 17 is visible.

In the container 3 described above, the cross-sectional shapes of the opening 34, flange portion 32, and side wall portion 31 are circular when viewed from above. However, these shapes are not limited to circles. Other shapes such as ellipses, rounded triangles, rounded polygons such as quadrilaterals, and shapes combining curves and straight lines can also be adopted.

Furthermore, in the above explanation, the width m of the overlapping portion 15 is the value obtained when the side wall portion 31, which has a curved surface and an inclined surface, is unfolded into a plane.

Next, we will describe embodiments for carrying out the second invention relating to labels and containers. Here, we will describe embodiment (1) for carrying out the second invention relating to labels and containers.

First, the label of the present invention will be explained using Figures 13 to 15.
The label of the present invention is a label made of three or more laminated layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, the heat-adhesive temperature of the heat-adhesive resin is in the range of 70 to 115°C, the label has a peeling tab on one side edge, and a release layer is formed on the outer surface of the outer layer near the other side edge of the label.

The label of the present invention is a label having the above-described configuration, wherein one of the sides of the label has a notch at the upper end.

Figure 13 shows the outer surface 11 of label 1. Here, label 1 is a component to be in-mold molded into a container (described later). The outer surface 11 of label 1 is the surface that becomes the outside of the container when label 1 is in-mold molded into the container.

The upper edge 13 of label 1 is the edge that will be above the side wall of the container (described later) when label 1 is in-mold molded into the container. The lower edge 14 of label 1 is the edge that will be below the side wall of the container when label 1 is in-mold molded into the container.

Label 1 has a peel-off tab 18 on one side edge 16. This peel-off tab 18 will be described later.
Label 1 has a notch 19 at the upper end of one side edge 16. This notch 19 will be described later.

A rectangular release layer 24 is formed on the outer surface 11 of the outer layer (described later) of label 1, near the other side edge 17 of label 1. This release layer 24 will be described later.

Figure 14 shows the inner surface 12 of label 1. Here, the inner surface 12 of label 1 is the surface that becomes the inside of the container when label 1 is in-mold molded into the container.
The release layer 24 is formed on the outer surface 11 of the outer layer (described later) of the label 1 and is not visible from the inner surface 12, so it is shown with a dotted line.

Figure 15 is a cross-sectional view of label 1 along line E-E' in Figure 13.
As shown in Figure 15, label 1 has a three-layer structure consisting of an outer layer 21, an intermediate layer 22, and an inner layer 23.

Here, the outer layer 21 is made of a heat-adhesive resin. The heat-adhesive resin is preferably polypropylene (PP) or the like.

The thermal bonding temperature of the heat-bonding resin is preferably within the range of 70 to 115°C. Furthermore, it is even more preferable that the thermal bonding temperature of the heat-bonding resin is within the range of 75 to 109°C.

A heat bonding temperature of 70°C or higher has the advantage of allowing the heat-bonding resin to withstand the temperature of the molten resin during injection molding, thus preventing the formation of air bubbles. This effect becomes even more pronounced at a heat bonding temperature of 75°C or higher.

A key advantage of a thermal bonding temperature of 115°C or lower is that the thermal bonding resin melts due to the temperature of the molten resin during injection molding, resulting in stronger adhesion. This effect becomes even more pronounced when the thermal bonding temperature is 109°C or lower.

Here, the "thermal bonding temperature" (°C) is measured and defined by the following method: Two strip-shaped test pieces, 15 mm wide, are cut from a single-layer film of the thermal bonding resin. These two test pieces are stacked together to form a sample. Using a sealing device, the sample is compressed and heated in a sealing bar under conditions of 23°C and 50% RH. The heat seal temperature (°C) of this sealing bar is varied at various temperatures, and the heat seal strength of the bonded sample is measured. The heat seal temperature (°C) at which the heat seal strength of the bonded sample becomes 3 N/15 mm width is defined as the "thermal bonding temperature" (°C).
The definition of "thermal bonding temperature" (°C) described below is the same.

The numerical ranges for the thermal bonding temperatures mentioned above are merely preferred or even preferred ranges. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

The intermediate layer 22 is preferably composed of a barrier layer having barrier properties against oxygen, light, etc. Here, aluminum (Al) foil, aluminum-deposited polyethylene terephthalate (VMPET), etc., can be used as the barrier layer.

The inner layer 23 is made of a heat-adhesive resin. Here, the heat-adhesive resin is preferably polypropylene (PP) or the like.

The thermal bonding temperature of the heat-bonding resin is preferably within the range of 70 to 115°C. Furthermore, it is even more preferable that the thermal bonding temperature of the heat-bonding resin is within the range of 75 to 109°C.

A heat bonding temperature of 70°C or higher has the advantage of allowing the heat-bonding resin to withstand the temperature of the molten resin during injection molding, thus preventing the formation of air bubbles. This effect becomes even more pronounced at a heat bonding temperature of 75°C or higher.

A key advantage of a thermal bonding temperature of 115°C or lower is that the thermal bonding resin melts due to the temperature of the molten resin during injection molding, resulting in stronger adhesion. This effect becomes even more pronounced when the thermal bonding temperature is 109°C or lower.

The numerical ranges for the thermal bonding temperatures mentioned above are merely preferred or even preferred ranges. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

Label 1 is not limited to the three-layer structure described above. Label 1 may have a four-layer or more-layer structure.
Furthermore, the outer layer 21 and inner layer 23 described above can be used as the outer layer and inner layer, respectively. In addition, the intermediate layer 22 described above can be used as the intermediate layer.
The outer layer and the inner layer may contain one or more other layers besides the intermediate layer.

The release layer 24 is formed on the outer surface 11 of the outer layer 21, near the other side edge 17 of the label 1. Forming the release layer 24 on the outer surface 11 of the outer layer 21 has the advantage of simplifying the formation process and reducing costs.

The method for preparing the release layer 24 is as follows: First, the release layer coating is applied to the outer surface 11 of the label 1. Then, this release layer coating is dried. As a result, the dried release layer coating becomes the release layer 24.

The release layer 24 adheres to the outer surface 11 of the label 1 during the drying process of the release layer coating. This release layer 24 has weak adhesion to the inner surface 12 of the inner layer 23 of the label 1, which is made of heat-activated adhesive resin. The process of this adhesion will be described later.

Next, the container of the present invention will be described with reference to Figures 16 to 28.
The container of the present invention is a container formed by in-mold molding of a label having the above-described configuration, and has an overlapping portion where one side of the label rests on the other side of the label.

The container of the present invention is an in-mold molded container with a label having the above-described configuration, and has an overlapping portion where one side of the label rests on the other side of the label, with the peel-off piece located on the release layer.

The container of the present invention has a flange portion at the upper end of the side wall, and a label of one of the above configurations is in-mold molded onto the side wall. The label has an overlapping portion where one side edge rests on the other side edge, and a notch exists in the flange portion.

Figure 16 is a perspective view of the container. Figure 17 is a front view of the container.

As shown in Figures 16 and 17, the container 3 is a resin container in which the label 1 described above is in-mold molded. Specifically, the container 3 is a resin container in which the label 1 described above is in-mold molded onto the side wall portion 31 of the container 3. The container 3 has an opening 34 at the top of the drawing. This opening 34 is circular when viewed from above the container 3. The container 3 also has an inverted truncated cone shape. The container 3 has a bottom portion 33 (see Figure 21) at the bottom. The peripheral portion of this bottom portion 33 has a threaded foot at the bottom and a wall at the top. Here, the threaded foot and the wall together are defined as the side wall portion 31. At the upper end of the side wall portion 31, there is a flange portion 32 of a perforated concentric disc formed horizontally.

A release layer 24 is formed on the side wall portion 31. The release layer 24 will be described later.
A peeling piece 18 is formed on the release layer 24. The peeling piece 18 will be described later.

An overlapping portion 15 is formed in the side wall portion 31. This overlapping portion 15 is the area where one side edge portion 16 of the label 1 overlaps the other side edge portion 17 when the label 1 is in-mold molded into the container 3. The overlapping portion 15 will be described later.
The resin portion of container 3 is preferably made of polypropylene (PP) or the like.

Figure 18 is an enlarged front view of the container shown in Figure 17.

The peeling piece 18 is located on the peeling layer 24. The area of the peeling piece 18 is defined as follows: There are two intersection points between the boundary line 241 on the left side of the peeling layer 24 and the line of the end portion 161 of one side portion 16. These are the upper intersection point p and the lower intersection point q. The area enclosed by the line segment pq connecting intersection points p and q, and the line of the convex end portion 161, is defined as the area of the peeling piece 18. The longest horizontal distance between line segment pq and the line of the convex end portion 161 is defined as the width n of the peeling piece 18. The distance between intersection point p and intersection point q is defined as the height l of the peeling piece 18.

The convex end portion 161 of the peel-off piece 18 has a horizontal Mount Fuji-like shape. The shape of the convex end portion 161 is not limited to this shape. Other shapes that can be used for the convex end portion 161 include polygons such as triangles and quadrilaterals, curves such as semicircles and semi-ellipses, and lines consisting of a combination of curves and straight lines.

The convex end portion 161 of the peel-off piece 18 has one convex section. However, the shape of the convex end portion 161 is not limited to having only one convex section. In addition, the shape of the convex end portion 161 may have multiple convex sections.

The peeling piece 18 is located approximately in the center of the side wall 31 of the container 3 in the vertical direction. The position of the peeling piece 18 is not limited to this position. In addition, the position of the peeling piece 18 may be any other position on the side wall 31 of the container 3 in the vertical direction, such as above, in the center, or below the side wall 31.

The width n of the peel-off piece 18 is preferably such that it can be grasped with at least two fingers.
The height l of the peeling piece 18 may be a part of the height of the side wall 31 of the container 3 in the vertical direction, or it may be the entire height of the side wall 31.

In the explanation in Figure 18 above, the upper and lower ends of the boundary line 241 on the left side of the peeling layer 24 are located to the right of the end 161 of one of the side portions 16. However, the upper and lower ends of the boundary line 241 are not limited to these positions. They may coincide with the end 161 of one of the side portions 16. Furthermore, part or both of the upper and lower ends of the boundary line 241 may be located to the left of the end 161 of one of the side portions 16.

The line of the end portion 161 from the intersection point p in the peeling piece 18 to the upper end of the side wall portion 31 will be described. Let angle α be the angle between the tangent line of the end portion 161 at intersection point p and the horizontal line.

The angle α is preferably within the range of 30 to 80°. Furthermore, it is even more preferable that the angle α is within the range of 40 to 75°.

When the angle α is within the range of 30 to 80°, it is possible to prevent the cutting of one side portion 16 when peeling it away from the other side portion 17, and the peeling force is distributed, making it easier to peel off one side portion 16. Furthermore, this effect becomes even more pronounced when the angle α is within the range of 40 to 75°.

Furthermore, the numerical range of angle α mentioned above merely indicates a preferred or even preferred range. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

The line at end 161 may be a curve, a straight line, or a combination of a curve and a straight line. Here, if the line at end 161 is a curve or a combination of a curve and a straight line, it is preferable that the curvature of the curve changes smoothly.

The line of the end portion 161 from the intersection point q of the peeling piece 18 to the lower end of the side wall portion 31 will be described. Let angle β be the angle between the tangent line of the end portion 161 at intersection point q and the horizontal line.

The angle β is preferably within the range of 30 to 80°. Furthermore, it is even more preferable that the angle β is within the range of 40 to 75°.

When the angle β is within the range of 30 to 80°, it is possible to prevent the cutting of one side portion 16 when peeling it away from the other side portion 17, and the peeling force is distributed, making it easier to peel off one side portion 16. Furthermore, this effect becomes even more pronounced when the angle β is within the range of 40 to 75°.

Furthermore, the numerical range of angle β mentioned above merely indicates a preferred or even preferred range. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

The line at end 161 may be a curve, a straight line, or a combination of a curve and a straight line. Here, if the line at end 161 is a curve or a combination of a curve and a straight line, it is preferable that the curvature of the curve changes smoothly.

An overlapping portion 15 is formed in the side wall portion 31. The area of the overlapping portion 15 is defined as follows: The area enclosed by the line of the end portion 161 from intersection point p to the upper end of the side wall portion 31, the line segment pq connecting intersection point p and intersection point q, the line of the end portion 161 from intersection point q to the lower end of the side wall portion 31, the notch portion 19 of the label 1 (described later), the lower edge 14 of the label 1, and the line of the end portion 171 of the other side edge portion 17 is defined as the area of the overlapping portion 15.

The width of the overlapping portion 15 is defined as follows: If the end 161 of one side portion 16 is not included in the peeling layer 24, the width m of the overlapping portion 15 is defined as the horizontal distance from the end 161 of one side portion 16 to the end 171 of the other side portion 17. If the end 161 of one side portion 16 is included in the peeling layer 24, the width m of the overlapping portion 15 is defined as the horizontal distance from the line segment pq connecting intersection point p and intersection point q to the end 171 of the other side portion 17.
Thus, the width m of the overlapping portion 15 changes depending on the vertical position of the side wall portion 31.

A release layer 24 is formed on the side wall portion 31.
The release layer 24 has a rectangular shape. However, the shape of the release layer 24 is not limited to this shape. In addition, the shape of the release layer 24 can be a polygon such as a triangle or a square, a curve such as a circle or an ellipse, or a combination of curves and straight lines.
In this case, it is preferable that the release layer 24 includes the entirety of the peeling piece 18.

Figure 19 is a cross-sectional view of the container along line F-F' in Figure 17. Figure 20 is an enlarged view of section c in Figure 19.
As shown in Figure 19, the cross-sectional shape of the side wall portion 31 is circular.

As shown in Figure 20, the container 3 has an overlapping portion 15 where one side portion 16 of the label 1 is placed on the other side portion 17 of the label 1.
One side 16 of label 1 is exposed to the outside of container 3. The other side 17 of label 1 is hidden beneath the one side 16 of label 1.

In the overlapping portion 15, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are bonded together. Both the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are made of a heat-bonding resin with a low heat bonding temperature. Therefore, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are fused and bonded together by the heat of the molten resin during injection molding.

As described above, both the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are made of a heat-bonding resin with a low heat bonding temperature. Therefore, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 fuse together due to the heat of the molten resin during injection molding, resulting in the advantage of increased adhesive strength.

Furthermore, the increased adhesive strength in the overlapping portion 15 provides the following benefits.
In other words, in conventional containers, if there is no overlapping portion and there is a gap between the sides of the label, cracking of the container occurs during injection molding due to the orientation of resin molecules caused by the flow of molten resin in the gap. In contrast, in the container 3 of the present invention, by forming an overlapping portion 15, it is possible to prevent cracking of the container 3 caused by the orientation of resin molecules.

Furthermore, in conventional containers, if there is no overlapping portion and a gap exists between the sides of the label, oxygen, light, etc., can penetrate from outside the container into the interior through that gap, making it impossible to ensure barrier properties. In contrast, in the container 3 of the present invention, by forming the overlapping portion 15, barrier properties against oxygen, light, etc. can be ensured.

In Figure 20, the distance from the end 171 of the other side portion 17 to the boundary line 241 on the left side of the release layer 24 is the width m of the overlapping portion 15. In Figures 18 and 20, the changing width m of the overlapping portion 15 is preferably at least long enough to prevent cracking of the container and ensure barrier properties against oxygen, light, etc.

As shown in Figure 20, the label 1 has a peel-off piece 18 on the other side edge 17.
The peel-off piece 18 is exposed on the outside of the container 3. The other side portion 17 of the label 1 is hidden beneath the peel-off piece 18.

The release layer 24 is adhered to the outer layer 21 of the other side portion 17. The peeling piece 18 is located on the release layer 24.
In the peel-off piece 18, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are not adhered due to the presence of the release layer 24. Furthermore, the lower corner of the tip of the inner layer 23 of one side portion 16 is rounded and deformed due to the heat of the molten resin during injection molding.

In Figure 20, the distance from the end portion 161 of one side portion 16 to the boundary line 241 on the left side of the peeling layer 24 is the width n of the peeling piece 18.

Figure 21 is a bottom view of container 3. Figure 22 is an enlarged view of the upper portion shown in Figure 21.
As shown in Figure 22, the overlapping portion 15 is the area enclosed by the end 161 of one side portion 16, the end 171 of the other side portion 17, and the notch 19 of the label 1.

As shown in Figure 22, the end portion 161 of one side portion 16, which is the boundary on the right side of the overlapping portion 15 in the drawing, is located on the side wall portion 31.
Furthermore, the end portion 171 of the other side portion 17, which is the left-hand boundary of the overlapping portion 15 in the drawing, is located in the side wall portion 31. In addition, the end portion 171 of the other side portion 17 is also located in the flange portion 32.

The notch 19 of label 1, which is the upper boundary of the overlapping portion 15 in the drawing, is located in the flange portion 32.
Therefore, the overlapping portion 15 consists of an overlapping portion 151 in the side wall portion 31 and an overlapping portion 152 in the flange portion 32.

In Figure 22, point s is defined as the end 161 of one side portion 16 located at the upper end of the side wall portion 31. Point t is defined as the tip of the end 171 of the other side portion 17 located at the flange portion 32. The notch portion 19 is defined as a straight line connecting point s (start point) and point t (end point).

The starting point is not limited to point s. Let point v be the end 171 of the other side portion 17, which is located at the upper end of the side wall portion 31. Let point u be a point located below point s. Here, the perimeter vs and the straight-line distance su are equal. Note that the straight-line distance su is the value when the side wall portion 31, which has a curved surface and an inclined surface, is unfolded into a plane. The starting point can be any point between point s and point u.
If the starting point is between point s and point u, one side portion 16 of the flange portion 32 can be peeled off with little force at the overlapping portion 152. This will be explained later.

The endpoint is not limited to point t. Let point w be the point where the extension of the end 161 of one side portion 16 intersects the edge of the label. Let x be another point on the edge of the label. Here, the straight-line distance ws and the perimeter xw are equal. The endpoint can be any point on the edge of the label between point t and point x.
If the endpoint is between points t and x on the edge of the label, then one side portion 16 of the flange portion 32 can be peeled off with little force at the overlapping portion 152. This will be explained later.

The line of the notch 19 may be a curve, or a combination of a curve and a straight line, etc. Here, it is preferable that the curvature of the curve changes smoothly.

Figure 23 is a cross-sectional view taken along the line G-G' in Figure 22. In other words, Figure 23 is a cross-sectional view taken at the end portion 161 of one of the side portions 16.
In the overlapping portion 151 of the side wall portion 31, the end portion 161 of one side edge portion 16 is formed on the outside of the side wall portion 31. The end face of the end portion 161 of one side edge portion 16 is visible.
Furthermore, the other side portion 17 is formed by adhering it to the inside of the end portion 161 of the other side portion 16. The cross-section of the other side portion 17 is visible.

In the flange portion 32, the other side portion 17 is formed on the outside of the flange portion 32. The other side portion 17 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the other side portion 17 is visible.

Figure 24 is a cross-sectional view taken along the line H-H' in Figure 22. That is, Figure 24 is a cross-sectional view taken along the cross-sectional line H-H', which passes between the end 161 of one side portion 16 and the end 171 of the other side portion 17.

In the overlapping portion 151 of the side wall portion 31, one side portion 16 is formed on the outside of the side wall portion 31. The cross-section of the one side portion 16 is visible.
Furthermore, one side portion 16 is bonded to the inside of the other side portion 17. The cross-section of the other side portion 17 is visible.

In the overlapping portion 152 of the flange portion 32, one side portion 16 is formed on the outside of the flange portion 32. The one side portion 16 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the one side portion 16 is visible.
Furthermore, a portion of the other side portion 17 is bonded to the inside of the other side portion 16. The remaining portion of the other side portion 17 is formed on the outside of the flange portion 32. The other side portion 17 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the other side portion 17 is visible.

In the container 3 described above, the cross-sectional shapes of the opening 34, flange portion 32, and side wall portion 31 are circular when viewed from above. However, these shapes are not limited to circles. Other shapes such as ellipses, rounded triangles, rounded polygons such as quadrilaterals, and shapes combining curves and straight lines can also be adopted.

The process of peeling label 1 from container 3 will be explained using Figures 25 to 28.
Figures 25-28 illustrate the process of peeling off the label. Note that the container cools and shrinks after injection molding. Figures 25-28 show the shape after shrinkage.

First, as shown in Figure 25, the peeling piece 18 is peeled off from the other side portion 17 by hooking a fingernail or the like onto the end 161 of one side portion 16.
Next, pinch the peeling piece 18 with your fingers and peel it off further.
Here, the peeling piece 18 can be peeled off from the other side portion 17 with minimal force. This is thought to be because the inner layer 23 of the peeling piece 18 has weak adhesive force to the release layer 24.

Next, as shown in Figure 26, one side portion 16 is peeled away from the other side portion 17 in the overlapping portion 15. A small force is required to peel one side portion 16 away from the other side portion 17. This is because, in the overlapping portion 15, there is no release layer 24 on the outer layer 21 of the other side portion 17. Therefore, it is thought that the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are adhered together.

Next, as shown in Figure 18, one side portion 16 is peeled off from the other side portion 17 along the line of the end portion 161 from the intersection point p in the peeling piece 18 to the upper end of the side wall portion 31, and along the line of the end portion 161 from the intersection point q in the peeling piece 18 to the lower end of the side wall portion 31.
Here, the force required to separate one side portion 16 from the other side portion 17 gradually increases. This is thought to be because the vertical distance of the portion of one side portion 16 being separated gradually increases.
The effects of having angles α and β within a favorable range are as described above.

Next, as shown in Figure 22, one side portion 16 is peeled away from the other side portion 17 along the notch 19. One side portion 16 can be peeled away from the other side portion 17 with little force. The reason why it can be peeled away with little force is thought to be as follows: In conventional containers, as shown in Figure 11, the end portion 161 of one side portion 16 is located in the overlapping portion 152 of the flange portion 32, so a large force is required to peel away the end portion 161 of one side portion 16.

In contrast, in the container of the present invention shown in Figure 23, the flange portion 32 does not have an end portion 161 of one side portion 16. Therefore, the end portion 161 of one side portion 16 can be peeled off with little force at the overlapping portion 151 of the side wall portion 31. Also, as shown in Figure 24, in the overlapping portion 152 of the flange portion 32, one side portion 16 gradually increases in size. Therefore, in the overlapping portion 152 of the flange portion 32, one side portion 16 can be peeled off with little force.

Next, as shown in Figure 27, the inner layer 23 of label 1 breaks. The reason for this is thought to be as follows: The inner layer 23 of label 1 and the resin portion 35 of the side wall 31 are strongly bonded. The force required to break the inner layer 23 is less than this adhesive force. Therefore, the inner layer 23 of label 1 breaks.

The force required to break the inner layer 23 of label 1 is a slightly larger force.
In the comparison label, a large force was required to break the inner layer. The "comparison label" has a three-layer structure. The material of the intermediate layer is aluminum-coated polyethylene terephthalate (VMPET), and the material of the inner layer is polypropylene (PP) with a heat bonding temperature of 135°C. The composition is the same for all "comparison labels" below.

In contrast, the label of the present invention has the effect of requiring only a slightly larger force to break it. This is thought to be because the inner layer 23 of the label 1 of the present invention uses a heat-bonding resin with a low heat bonding temperature, resulting in a smaller breaking force compared to the comparative label.

Furthermore, by requiring a slightly greater force to break the inner layer 23 of label 1, the following effects can be obtained: Even if the peel-off piece 18 and overlapping portion 15 of label 1 peel off due to vibration during container transport, further peeling can be prevented. Also, even if the peel-off piece 18 and overlapping portion 15 of label 1 are peeled off for the purpose of tampering or tampering, further peeling can be prevented.

Next, as shown in Figure 28, peel the intermediate layer 22 of label 1 from the inner layer 23. Only a small force is needed to peel the intermediate layer 22 from the inner layer 23.
In the comparative label, a large force was required to peel the intermediate layer 22 from the inner layer 23. In contrast, the label of the present invention has the effect of requiring only a small force to peel it off. This is thought to be because the inner layer 23 of the label 1 of the present invention uses a heat-adhesive resin with a low heat bonding temperature, so the adhesive force between the intermediate layer 22 and the inner layer 23 is smaller than that of the comparative label.

As described above, the label 1 can be peeled off the container 3 by the operation shown in Figures 25-28. Since the peeled-off label contains a material different from the resin part 35 (such as aluminum foil), it is treated as industrial waste. This process reduces the volume of industrial waste. On the other hand, the remaining resin part 35 and the inner layer 23 attached to it are made of the same material and can be used as recycled material.

In the above explanation, the width n of the peeling piece 18, the height l of the peeling piece 18, the width m of the overlapping portion 15, the angle α, and the angle β are values obtained when the side wall portion 31, which has a curved surface and an inclined surface, is unfolded into a plane.

Next, a second embodiment (part 2) for carrying out the second invention relating to labels and containers will be described.

This section describes aspects that differ from those described in Embodiment (Part 1) for carrying out the second invention relating to labels and containers. The descriptions of other aspects are the same as those described in Embodiment (Part 1) for carrying out the second invention relating to labels and containers.

First, the label of the present invention will be explained with reference to Figure 29.
The label of the present invention is a label made of three or more laminated layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, the heat-adhesive temperature of the heat-adhesive resin is in the range of 70 to 115°C, the label has a peeling tab on one side edge, and a release layer is formed on the outer surface of the outer layer near the other side edge of the label.

The label of the present invention is a label having the above-described configuration, wherein one of the sides of the label has a notch at the upper end.

Figure 29 shows the outer surface 11 of label 1.
Label 1 has a peel-off tab 18 on one side edge 16. This peel-off tab 18 will be described later.

A release layer 24 is formed on the outer surface 11 of the outer layer of label 1, near the other side edge 17 of label 1. This release layer 24 will be described later.

Next, the container of the present invention will be described with reference to Figures 30 and 31.
The container of the present invention is a container formed by in-mold molding of a label having the above-described configuration, and has an overlapping portion where one side of the label rests on the other side of the label.

The container of the present invention is an in-mold molded container with a label having the above-described configuration, and has an overlapping portion where one side of the label rests on the other side of the label, with the peel-off piece located on the release layer.

The container of the present invention has a flange portion at the upper end of the side wall, and a label of one of the above configurations is in-mold molded onto the side wall. The label has an overlapping portion where one side edge rests on the other side edge, and a notch exists in the flange portion.

Figure 30 is a front view of the container. Figure 31 is an enlarged front view of the central portion of the container shown in Figure 30.

A release layer 24 is formed on the side wall portion 31. The release layer 24 will be described later.

A peeling piece 18 is formed on the peeling layer 24.
The convex end 161 of the peel-off piece 18 has a horizontal Mount Fuji-like shape. The shape of the convex end 161 is not limited to this shape. In addition, the shape of the convex end 161 can be a polygon such as a triangle or quadrilateral, a curve such as a semicircle or semiellipse, or a line consisting of a combination of a curve and a straight line.

The convex end portion 161 of the peel-off piece 18 has one convex section. However, the shape of the convex end portion 161 is not limited to having only one convex section. In addition, the shape of the convex end portion 161 may have multiple convex sections.

The peeling layer 24 has a horizontal, Mount Fuji-shaped form on its right side, which is larger than the peeling piece 18.
The edge of the peeling layer 24 and the edge of the peeling piece 18 are separated by a distance d.

The distance d is preferably within the range of 0 to 5 mm. Furthermore, it is even more preferable that the distance d is within the range of 0 to 1 mm.

Having a distance d of 0 mm or more has the advantage of providing a starting point for peeling off the peeling piece 18.

When the distance d is 5 mm or less, the design of the side wall 31 improves, resulting in a more aesthetically pleasing appearance. This effect becomes even more pronounced when the distance d is 1 mm or less.

Furthermore, the numerical range of distance d mentioned above merely indicates a preferred or even preferred range. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

The shape of the peeling layer 24 is not limited to a horizontal Mount Fuji-like shape. In addition, the shape of the peeling layer 24 can be a polygon such as a triangle or a square, a curve such as a circle or an ellipse, or a combination of curves and straight lines.
Here, it is preferable that the release layer 24 encompasses the entire peeling piece 18. Furthermore, it is preferable that the edge of the release layer 24 and the edge of the peeling piece 18 are separated by a distance d.

Next, a description will be given of a third embodiment for carrying out the label and container invention.

First, the label of the present invention will be explained using Figures 32 to 34.
The label of the present invention is a label made of three or more laminated layers, wherein the outer layer and inner layer are made of a heat-adhesive resin, the heat-adhesion temperature of the heat-adhesive resin is in the range of 70 to 115°C, the label has a peel-off tab on one side edge, and a release layer is formed on the peel-off tab on the inner surface of the inner layer.

The label of the present invention is a label having the above-described configuration, wherein one of the sides of the label has a notch at the upper end.

Figure 32 shows the outer surface 11 of label 1. Here, label 1 is a component to be in-mold molded into a container (described later). The outer surface 11 of label 1 is the surface that becomes the outside of the container when label 1 is in-mold molded into the container.

The upper edge 13 of label 1 is the edge that will be above the side wall of the container (described later) when label 1 is in-mold molded into the container. The lower edge 14 of label 1 is the edge that will be below the side wall of the container when label 1 is in-mold molded into the container.

Label 1 has a peel-off tab 18 on one side edge 16. This peel-off tab 18 will be described later.
Label 1 has a notch 19 at the upper end of one side edge 16. This notch 19 will be described later.

The release layer 24 is formed on the inner surface of label 1 (described later) and is not visible from the outer surface 11, so it is shown with a dotted line.

Figure 33 shows the inner surface 12 of label 1. Here, the inner surface 12 of label 1 is the surface that becomes the inside of the container when label 1 is in-mold molded into the container.

A release layer 24 is formed on the peel-off piece 18 of the inner surface 12 of the inner layer (described later) of label 1. This release layer 24 will be described later.

Figure 34 is a cross-sectional view of label 1 along line I-I' in Figure 32.
As shown in Figure 34, label 1 has a three-layer structure consisting of an outer layer 21, an intermediate layer 22, and an inner layer 23.

Here, the outer layer 21 is made of a heat-adhesive resin. The heat-adhesive resin is preferably polypropylene (PP) or the like.

The thermal bonding temperature of the heat-bonding resin is preferably within the range of 70 to 115°C. Furthermore, it is even more preferable that the thermal bonding temperature of the heat-bonding resin is within the range of 75 to 109°C.

A heat bonding temperature of 70°C or higher has the advantage of allowing the heat-bonding resin to withstand the temperature of the molten resin during injection molding, thus preventing the formation of air bubbles. This effect becomes even more pronounced at a heat bonding temperature of 75°C or higher.

A key advantage of a thermal bonding temperature of 115°C or lower is that the thermal bonding resin melts due to the temperature of the molten resin during injection molding, resulting in stronger adhesion. This effect becomes even more pronounced when the thermal bonding temperature is 109°C or lower.

Here, the "thermal bonding temperature" (°C) is measured and defined by the following method: Two strip-shaped test pieces, 15 mm wide, are cut from a single-layer film of the thermal bonding resin. These two test pieces are stacked together to form a sample. Using a sealing device, the sample is compressed and heated in a sealing bar under conditions of 23°C and 50% RH. The heat seal temperature (°C) of this sealing bar is varied at various temperatures, and the heat seal strength of the bonded sample is measured. The heat seal temperature (°C) at which the heat seal strength of the bonded sample becomes 3 N/15 mm width is defined as the "thermal bonding temperature" (°C).
The definition of "thermal bonding temperature" (°C) described below is the same.

The numerical ranges for the thermal bonding temperatures mentioned above are merely preferred or even preferred ranges. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

The intermediate layer 22 is preferably composed of a barrier layer having barrier properties against oxygen, light, etc. Here, aluminum (Al) foil, aluminum-deposited polyethylene terephthalate (VMPET), etc., can be used as the barrier layer.

The inner layer 23 is made of a heat-adhesive resin. Here, the heat-adhesive resin is preferably polypropylene (PP) or the like.

The thermal bonding temperature of the heat-bonding resin is preferably within the range of 70 to 115°C. Furthermore, it is even more preferable that the thermal bonding temperature of the heat-bonding resin is within the range of 75 to 109°C.

A heat bonding temperature of 70°C or higher has the advantage of allowing the heat-bonding resin to withstand the temperature of the molten resin during injection molding, thus preventing the formation of air bubbles. This effect becomes even more pronounced at a heat bonding temperature of 75°C or higher.

A key advantage of a thermal bonding temperature of 115°C or lower is that the thermal bonding resin melts due to the temperature of the molten resin during injection molding, resulting in stronger adhesion. This effect becomes even more pronounced when the thermal bonding temperature is 109°C or lower.

The numerical ranges for the thermal bonding temperatures mentioned above are merely preferred or even preferred ranges. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

Label 1 is not limited to the three-layer structure described above. Label 1 may have a four-layer or more-layer structure.
Furthermore, the outer layer 21 and inner layer 23 described above can be used as the outer layer and inner layer, respectively. In addition, the intermediate layer 22 described above can be used as the intermediate layer.
The outer layer and the inner layer may contain one or more other layers besides the intermediate layer.

The release layer 24 is formed on the peel-off piece 18 on the inner surface 12 of the inner layer 23 of the label 1. Here, forming the release layer 24 on the inner surface 12 of the inner layer 23 has the advantage of allowing the display on the peel-off piece 18 and the display in the adjacent area to be continuous on the side wall 31 of the container 3 in which the label 1 is in-mold molded, resulting in superior design.

The method for preparing the release layer 24 is as follows: First, the release layer coating is applied to the inner surface 12 of the label 1. Then, this release layer coating is dried. As a result, the dried release layer coating becomes the release layer 24.

The release layer 24 adheres to the inner surface 12 of the label 1 during the drying process of the release layer coating. This release layer 24 has weak adhesion to the outer surface 11 of the outer layer 21 of the label 1, which is made of heat-activated adhesive resin. The process of this adhesion will be described later.

Next, the container of the present invention will be described with reference to Figures 35 to 43.
The container of the present invention is a container formed by in-mold molding of a label having the above-described configuration, and has an overlapping portion where one side of the label rests on the other side of the label.

The container of the present invention has a flange portion at the upper end of the side wall, and a label of one of the above configurations is in-mold molded onto the side wall. The label has an overlapping portion where one side edge rests on the other side edge, and a notch exists in the flange portion.

Figure 35 is a perspective view of the container. Figure 36 is a front view of the container.

As shown in Figures 35 and 36, the container 3 is a resin container in which the label 1 described above is in-mold molded. Specifically, the container 3 is a resin container in which the label 1 described above is in-mold molded onto the side wall portion 31 of the container 3. The container 3 has an opening 34 at the top of the drawing. This opening 34 is circular when viewed from above the container 3. The container 3 also has an inverted truncated cone shape. At the bottom of the container 3 is a base portion 33 (see Figure 21). The peripheral portion of this base portion 33 has a threaded foot at the bottom and a wall at the top. Here, the threaded foot and the wall together are defined as the side wall portion 31. At the upper end of the side wall portion 31 is a flange portion 32 of a perforated concentric disc formed horizontally.

An overlapping portion 15 is formed in the side wall portion 31. This overlapping portion 15 is the area where one side edge portion 16 of the label 1 overlaps the other side edge portion 17 when the label 1 is in-mold molded into the container 3. The overlapping portion 15 will be described later.
The resin portion of container 3 is preferably made of polypropylene (PP) or the like.

Figure 37 is an enlarged front view of the container shown in Figure 36.

The area of the peel-off piece 18 is defined as follows: There are two intersection points between the boundary line 241 on the left side of the peel-off layer 24 and the line of the end portion 161 of one side portion 16. These are the upper intersection point p and the lower intersection point q. The area enclosed by the line segment pq connecting intersection points p and q, and the line of the convex end portion 161, is defined as the area of the peel-off piece 18. The longest horizontal distance between line segment pq and the line of the convex end portion 161 is defined as the width n of the peel-off piece 18. The distance between intersection point p and intersection point q is defined as the height l of the peel-off piece 18.

The convex end portion 161 of the peel-off piece 18 has a horizontal Mount Fuji-like shape. The shape of the convex end portion 161 is not limited to this shape. Other shapes that can be used for the convex end portion 161 include polygons such as triangles and quadrilaterals, curves such as semicircles and semi-ellipses, and lines consisting of a combination of curves and straight lines.

The convex end portion 161 of the peel-off piece 18 has one convex section. However, the shape of the convex end portion 161 is not limited to having only one convex section. In addition, the shape of the convex end portion 161 may have multiple convex sections.

The peeling piece 18 is located approximately in the center of the side wall 31 of the container 3 in the vertical direction. The position of the peeling piece 18 is not limited to this position. In addition, the position of the peeling piece 18 may be any other position on the side wall 31 of the container 3 in the vertical direction, such as above, in the center, or below the side wall 31.

The width n of the peel-off piece 18 is preferably such that it can be grasped with at least two fingers.
The height l of the peeling piece 18 may be a part of the height of the side wall 31 of the container 3 in the vertical direction, or it may be the entire height of the side wall 31.

The line of the end portion 161 from the intersection point p in the peeling piece 18 to the upper end of the side wall portion 31 will be described. Let angle α be the angle between the tangent line of the end portion 161 at intersection point p and the horizontal line.

The angle α is preferably within the range of 30 to 80°. Furthermore, it is even more preferable that the angle α is within the range of 40 to 75°.

When the angle α is within the range of 30 to 80°, it is possible to prevent the cutting of one side portion 16 when peeling it away from the other side portion 17, and the peeling force is distributed, making it easier to peel off one side portion 16. Furthermore, this effect becomes even more pronounced when the angle α is within the range of 40 to 75°.

Furthermore, the numerical range of angle α mentioned above merely indicates a preferred or even preferred range. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

The line at end 161 may be a curve, a straight line, or a combination of a curve and a straight line. Here, if the line at end 161 is a curve or a combination of a curve and a straight line, it is preferable that the curvature of the curve changes smoothly.

The line of the end portion 161 from the intersection point q of the peeling piece 18 to the lower end of the side wall portion 31 will be described. Let angle β be the angle between the tangent line of the end portion 161 at intersection point q and the horizontal line.

The angle β is preferably within the range of 30 to 80°. Furthermore, it is even more preferable that the angle β is within the range of 40 to 75°.

When the angle β is within the range of 30 to 80°, it is possible to prevent the cutting of one side portion 16 when peeling it away from the other side portion 17, and the peeling force is distributed, making it easier to peel off one side portion 16. Furthermore, this effect becomes even more pronounced when the angle β is within the range of 40 to 75°.

Furthermore, the numerical range of angle β mentioned above merely indicates a preferred or even preferred range. Therefore, it is certainly possible to achieve the aforementioned effects even outside of these preferred or even preferred ranges.

The line at end 161 may be a curve, a straight line, or a combination of a curve and a straight line. Here, if the line at end 161 is a curve or a combination of a curve and a straight line, it is preferable that the curvature of the curve changes smoothly.

An overlapping portion 15 is formed in the side wall portion 31. The area of the overlapping portion 15 is defined as follows: The area enclosed by the line of the end portion 161 from intersection point p to the upper end of the side wall portion 31, the line segment pq connecting intersection point p and intersection point q, the line of the end portion 161 from intersection point q to the lower end of the side wall portion 31, the notch portion 19 of the label 1 (described later), the lower edge 14 of the label 1, and the line of the end portion 171 of the other side edge portion 17 is defined as the area of the overlapping portion 15.

The width of the overlapping portion 15 is defined as follows: If the end 161 of one side portion 16 does not constitute a peeling piece 18, the width m of the overlapping portion 15 is defined as the horizontal distance from the end 161 of one side portion 16 to the end 171 of the other side portion 17. If the end 161 of one side portion 16 constitutes a peeling piece 18, the width m of the overlapping portion 15 is defined as the horizontal distance from the line segment pq connecting intersection point p and intersection point q to the end 171 of the other side portion 17.
Thus, the width m of the overlapping portion 15 changes depending on the vertical position of the side wall portion 31.

The convex line on the right side of the drawing in the release layer 24 has a horizontal, Mount Fuji-like shape, matching the line of the convex end 161 on the peeling piece 18. The shape of the convex line on the right side of the drawing in the release layer 24 is not limited to this shape. In addition, the shape of the convex line on the right side of the drawing in the release layer 24 can be a polygon such as a triangle or quadrilateral, a curve such as a semicircle or semiellipse, or a line consisting of a combination of curves and straight lines, matching the line of the convex end 161 on the peeling piece 18.

The convex line on the right side of the drawing in the release layer 24 has one convex portion. However, the shape of this convex line is not limited to having one convex portion. In addition, the shape of the convex line on the right side of the drawing in the release layer 24 may have multiple convex portions, matching the shape of the convex end portion 161 of the peeling piece 18.
In this case, it is preferable that the release layer 24 includes the entirety of the peeling piece 18.

Figure 38 is a cross-sectional view of the container along line J-J' in Figure 36. Figure 39 is an enlarged view of portion d in Figure 38.
As shown in Figure 38, the cross-sectional shape of the side wall portion 31 is circular.

As shown in Figure 39, the container 3 has an overlapping portion 15 where one side portion 16 of the label 1 is placed on the other side portion 17 of the label 1.
One side 16 of label 1 is exposed to the outside of container 3. The other side 17 of label 1 is hidden beneath the one side 16 of label 1.

In the overlapping portion 15, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are bonded together. Both the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are made of a heat-bonding resin with a low heat bonding temperature. Therefore, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are fused and bonded together by the heat of the molten resin during injection molding.

As described above, both the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are made of a heat-bonding resin with a low heat bonding temperature. Therefore, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 fuse together due to the heat of the molten resin during injection molding, resulting in the advantage of increased adhesive strength.

Furthermore, the increased adhesive strength in the overlapping portion 15 provides the following benefits.
In other words, in conventional containers, if there is no overlapping portion and there is a gap between the sides of the label, cracking of the container occurs during injection molding due to the orientation of resin molecules caused by the flow of molten resin in the gap. In contrast, in the container 3 of the present invention, by forming an overlapping portion 15, it is possible to prevent cracking of the container 3 caused by the orientation of resin molecules.

Furthermore, in conventional containers, if there is no overlapping portion and a gap exists between the sides of the label, oxygen, light, etc., can penetrate from outside the container into the interior through that gap, making it impossible to ensure barrier properties. In contrast, in the container 3 of the present invention, by forming the overlapping portion 15, barrier properties against oxygen, light, etc. can be ensured.

In Figure 39, the distance from the end 171 of the other side portion 17 to the left-hand boundary line 241 of the release layer 24 is the width m of the overlapping portion 15. In Figures 37 and 39, the changing width m of the overlapping portion 15 is preferably at least long enough to prevent cracking of the container and ensure barrier properties against oxygen, light, etc.

As shown in Figure 39, the other side edge 17 of the label 1 has a peel-off piece 18.
The peel-off piece 18 is exposed on the outside of the container 3. The other side portion 17 of the label 1 is hidden beneath the peel-off piece 18.

The release layer 24 is adhered to the inner surface 12 of the inner layer 23 of one side portion 16.
In the peel-off piece 18, the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are not adhered due to the presence of the release layer 24. Furthermore, the lower corner of the tip of the inner layer 23 of one side portion 16 is rounded and deformed due to the heat of the molten resin during injection molding.

In Figure 39, the distance from the end portion 161 of one side portion 16 to the boundary line 241 on the left side of the peeling layer 24 is the width n of the peeling piece 18.

The overlapping portion 15 in the container of the embodiment for carrying out the third invention is the same as the overlapping portion 15 in the container of the embodiment (1) for carrying out the second invention.
Therefore, the overlapping portion 15 will be explained using Figures 22 to 24.

As shown in Figure 22, the overlapping portion 15 is the area enclosed by the end 161 of one side portion 16, the end 171 of the other side portion 17, and the notch 19 of the label 1.

As shown in Figure 22, the end portion 161 of one side portion 16, which is the boundary on the right side of the overlapping portion 15 in the drawing, is located on the side wall portion 31.
Furthermore, the end portion 171 of the other side portion 17, which is the left-hand boundary of the overlapping portion 15 in the drawing, is located in the side wall portion 31. In addition, the end portion 171 of the other side portion 17 is also located in the flange portion 32.

The notch 19 of label 1, which is the upper boundary of the overlapping portion 15 in the drawing, is located in the flange portion 32.
Therefore, the overlapping portion 15 consists of an overlapping portion 151 in the side wall portion 31 and an overlapping portion 152 in the flange portion 32.

In Figure 22, point s is defined as the end 161 of one side portion 16 located at the upper end of the side wall portion 31. Point t is defined as the tip of the end 171 of the other side portion 17 located at the flange portion 32. The notch portion 19 is defined as a straight line connecting point s (start point) and point t (end point).

The starting point is not limited to point s. Let point v be the end 171 of the other side portion 17, which is located at the upper end of the side wall portion 31. Let point u be a point located below point s. Here, the perimeter vs and the straight-line distance su are equal. Note that the straight-line distance su is the value when the side wall portion 31, which has a curved surface and an inclined surface, is unfolded into a plane. The starting point can be any point between point s and point u.
If the starting point is between point s and point u, one side portion 16 of the flange portion 32 can be peeled off with little force at the overlapping portion 152. This will be explained later.

The endpoint is not limited to point t. Let point w be the point where the extension of the end 161 of one side portion 16 intersects the edge of the label. Let x be another point on the edge of the label. Here, the straight-line distance ws and the perimeter xw are equal. The endpoint can be any point on the edge of the label between point t and point x.
If the endpoint is between points t and x on the edge of the label, then one side portion 16 of the flange portion 32 can be peeled off with little force at the overlapping portion 152. This will be explained later.

The line of the notch 19 may be a curve, or a combination of a curve and a straight line, etc. Here, it is preferable that the curvature of the curve changes smoothly.

Figure 23 is a cross-sectional view taken along the line G-G' in Figure 22. In other words, Figure 23 is a cross-sectional view taken at the end portion 161 of one of the side portions 16.
In the overlapping portion 151 of the side wall portion 31, the end portion 161 of one side edge portion 16 is formed on the outside of the side wall portion 31. The end face of the end portion 161 of one side edge portion 16 is visible.
Furthermore, the other side portion 17 is formed by adhering it to the inside of the end portion 161 of the other side portion 16. The cross-section of the other side portion 17 is visible.

In the flange portion 32, the other side portion 17 is formed on the outside of the flange portion 32. The other side portion 17 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the other side portion 17 is visible.

Figure 24 is a cross-sectional view taken along the line H-H' in Figure 22. That is, Figure 24 is a cross-sectional view taken along the cross-sectional line H-H', which passes between the end 161 of one side portion 16 and the end 171 of the other side portion 17.

In the overlapping portion 151 of the side wall portion 31, one side portion 16 is formed on the outside of the side wall portion 31. The cross-section of the one side portion 16 is visible.
Furthermore, one side portion 16 is bonded to the inside of the other side portion 17. The cross-section of the other side portion 17 is visible.

In the overlapping portion 152 of the flange portion 32, one side portion 16 is formed on the outside of the flange portion 32. The one side portion 16 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the one side portion 16 is visible.
Furthermore, a portion of the other side portion 17 is bonded to the inside of the other side portion 16. The remaining portion of the other side portion 17 is formed on the outside of the flange portion 32. The other side portion 17 is bent from the side wall portion 31 toward the flange portion 32. The cross-section of the other side portion 17 is visible.

In the container 3 described above, the cross-sectional shapes of the opening 34, flange portion 32, and side wall portion 31 are circular when viewed from above. However, these shapes are not limited to circles. Other shapes such as ellipses, rounded triangles, rounded polygons such as quadrilaterals, and shapes combining curves and straight lines can also be adopted.

The process of peeling label 1 from container 3 will be explained using Figures 40 to 43.
Figures 40-43 illustrate the process of peeling off the label. Note that the container cools and shrinks after injection molding. Figures 40-43 show the shape after shrinkage.

First, as shown in Figure 40, the peeling piece 18 is peeled off from the other side portion 17 by hooking a fingernail or the like onto the end 161 of one side portion 16.
Next, pinch the peeling piece 18 with your fingers and peel it off further.
Here, the peeling piece 18 can be peeled off from the other side portion 17 with minimal force. This is thought to be because the outer layer 21 of the other side portion 17 has weak adhesive force to the release layer 24.

Next, as shown in Figure 41, one side portion 16 is peeled away from the other side portion 17 in the overlapping portion 15. A small force is required to peel one side portion 16 away from the other side portion 17. This is because, in the overlapping portion 15, there is no release layer 24 on the inner surface 12 of the inner layer 23 of one side portion 16. Therefore, it is thought that the inner layer 23 of one side portion 16 and the outer layer 21 of the other side portion 17 are adhered together.

Next, as shown in Figure 37, one side portion 16 is peeled off from the other side portion 17 along the line of the end portion 161 from the intersection point p of the peeling piece 18 to the upper end of the side wall portion 31, and along the line of the end portion 161 from the intersection point q of the peeling piece 18 to the lower end of the side wall portion 31.
Here, the force required to separate one side portion 16 from the other side portion 17 gradually increases. This is thought to be because the vertical distance of the portion of one side portion 16 being separated gradually increases.
The effects of having angles α and β within a favorable range are as described above.

Next, as shown in Figure 22, one side portion 16 is peeled away from the other side portion 17 along the notch 19. One side portion 16 can be peeled away from the other side portion 17 with little force. The reason why it can be peeled away with little force is thought to be as follows: In conventional containers, as shown in Figure 11, the end portion 161 of one side portion 16 is located in the overlapping portion 152 of the flange portion 32, so a large force is required to peel away the end portion 161 of one side portion 16.

In contrast, in the container of the present invention shown in Figure 23, the flange portion 32 does not have an end portion 161 of one side portion 16. Therefore, the end portion 161 of one side portion 16 can be peeled off with little force at the overlapping portion 151 of the side wall portion 31. Also, as shown in Figure 24, in the overlapping portion 152 of the flange portion 32, one side portion 16 gradually increases in size. Therefore, in the overlapping portion 152 of the flange portion 32, one side portion 16 can be peeled off with little force.

Next, as shown in Figure 42, the inner layer 23 of label 1 breaks. The reason for this is thought to be as follows: The inner layer 23 of label 1 and the resin portion 35 of the side wall 31 are strongly bonded. The force required to break the inner layer 23 is less than this adhesive force. Therefore, the inner layer 23 of label 1 breaks.

The force required to break the inner layer 23 of label 1 is a slightly larger force.
In the comparison label, a large force was required to break the inner layer. The "comparison label" has a three-layer structure. The material of the intermediate layer is aluminum-coated polyethylene terephthalate (VMPET), and the material of the inner layer is polypropylene (PP) with a heat bonding temperature of 135°C. The composition is the same for all "comparison labels" below.

In contrast, the label of the present invention has the effect of requiring only a slightly larger force to break it. This is thought to be because the inner layer 23 of the label 1 of the present invention uses a heat-bonding resin with a low heat bonding temperature, resulting in a smaller breaking force compared to the comparative label.

Furthermore, by requiring a slightly greater force to break the inner layer 23 of label 1, the following effects can be obtained: Even if the peel-off piece 18 and overlapping portion 15 of label 1 peel off due to vibration during container transport, further peeling can be prevented. Also, even if the peel-off piece 18 and overlapping portion 15 of label 1 are peeled off for the purpose of tampering or tampering, further peeling can be prevented.

Next, as shown in Figure 43, the intermediate layer 22 of label 1 is peeled away from the inner layer 23. Only a small force is needed to peel the intermediate layer 22 away from the inner layer 23.
In the comparative label, a large force was required to peel the intermediate layer 22 from the inner layer 23. In contrast, the label of the present invention has the effect of requiring only a small force to peel it off. This is thought to be because the inner layer 23 of the label 1 of the present invention uses a heat-adhesive resin with a low heat bonding temperature, so the adhesive force between the intermediate layer 22 and the inner layer 23 is smaller than that of the comparative label.

As described above, the label 1 can be peeled off the container 3 by the operation shown in Figures 40-43. Since the peeled-off label contains a different material (such as aluminum foil) than the resin part 35, it is treated as industrial waste. This process reduces the volume of industrial waste. On the other hand, the remaining resin part 35 and the inner layer 23 attached to it are made of the same material and can be used as recycled materials.

In the above explanation, the width n of the peeling piece 18, the height l of the peeling piece 18, the width m of the overlapping portion 15, the angle α, and the angle β are values obtained when the side wall portion 31, which has a curved surface and an inclined surface, is unfolded into a plane.

Next, a description of an embodiment for carrying out the invention relating to the method of manufacturing a container will be given.

The manufacturing method of the container 3 of the present invention will now be described. The container 3 of the present invention can be manufactured by an injection molding method in which the label 1 is in-mold molded.
The injection molding process includes a label transport process, a label loading process, a mold closing process, a molten resin filling process, a mold opening process, and a mold release process.

In the label transport process, label 1 is introduced between the movable mold and the fixed mold, which are separated from each other.
In the label loading process, label 1 is loaded into the fixed mold. For loading label 1, commonly used methods such as air suction or static electricity can be employed.

In the mold closing process, the movable mold is moved toward the fixed mold. Once the mold closing process is complete, a space corresponding to the container 3 is formed between the movable mold and the fixed mold.
In the molten resin filling process, the molten resin injected from the gate flows into the space corresponding to the container 3. As the molten resin flows through this space, it presses the label 1 against the fixed mold. As a result, the label 1 adheres closely to the inner surface of the fixed mold.

In the mold opening process, after the molten resin in the space has cooled, the movable mold is moved away from the fixed mold. The injection-molded product, container 3, moves while remaining in close contact with the movable mold.
In the demolding process, a stripper is used to release the injection-molded product from the movable mold. This release process allows the container 3, which is the injection-molded product, to be obtained.

The manufacturing method for the container 3 of the present invention is not limited to the injection molding method described above. Other commonly used manufacturing methods can also be employed.

Furthermore, the present invention is not limited to the embodiments described above; it can, of course, adopt various other configurations without departing from the spirit of the invention.

1...Label, 11...Outer surface, 12...Inner surface, 13...Top edge, 14...Bottom edge, 15...Overlapping portion, 151...Overlapping portion of side wall, 152...Overlapping portion of flange, 16...One side edge, 161...End, 17...Other side edge, 171...End, 18...Release piece, 19...Notch, 21...Outer layer, 22...Intermediate layer, 23...Inner layer, 24...Release layer boundary, 241...Boundary of release layer, 3...Container, 31...Side wall, 32...Flange, 33...Bottom, 34...Opening, 35...Resin portion

Claims (6)

A label made of three or more layers,
The outer and inner layers are made of heat-bonding resin.
The thermal bonding temperature of the aforementioned heat-bonding resin is within the range of 70 to 115°C.
The label has a peel-off tab on one side,
A label characterized by having a release layer formed on the outer surface of the outer layer, near the other side edge of the label. A label made of three or more layers,
The outer and inner layers are made of heat-bonding resin.
The thermal bonding temperature of the aforementioned heat-bonding resin is within the range of 70 to 115°C.
The label has a peel-off tab on one side,
A label characterized in that a release layer is formed on the peeling piece of the inner surface of the inner layer. The label according to any one of claims 1 to 2 , characterized in that it has a notch at the upper end of one side of the label. A container formed by in-mold molding a label according to any one of claims 1 to 2 ,
A container characterized by having an overlapping portion where one side of the label rests on the other side of the label. A container formed by in-mold molding the label described in claim 1 ,
The label has an overlapping portion where one side is placed on top of the other side of the label,
A container characterized in that the aforementioned peeling piece is present on the release layer. The side wall portion has a flange portion at its upper end.
One of the labels described in claim 3 is in-mold molded onto the side wall portion,
The label has an overlapping portion where one side is placed on top of the other side of the label,
A container characterized in that a notch exists in the flange portion.