JP7739745B2 - packaging bag - Google Patents

Description

The present invention relates to a packaging bag. In particular, it relates to a packaging bag with a spout, made of a plastic film as a base material, capable of containing liquids and other fluids.

Packaging bags capable of storing liquids and other fluids are widely available, and are made from plastic film as a base material, either alone or as laminates. They come in a variety of shapes and are used for a wide range of purposes, making them an indispensable part of people's lives.

For example, in the food sector, plastic containers are widely used for liquid and paste-like contents such as beverages, prepared foods, seasonings, and retort pouch foods. In the fields of daily necessities and toiletries, a wide variety of products are stocked on the shelves of supermarkets, drugstores, and convenience stores. In this way, they are being used in a variety of applications as liquid containers, not just in the food sector.

The advantages of packaging bags include their low price compared to containers such as cans and bottles, the ability to fine-tune material design to meet required quality, and the fact that they are lightweight and space-saving before filling and during distribution and storage. Packaging bags can also be said to be environmentally friendly from the perspective of reducing waste.

In addition, high-resolution printing on the layer visible from the surface can improve the product's image and display necessary information about the contents, and printing barcodes, for example, can also serve as a source of product distribution management and marketing information.

Some packaging bags are commercially available that are able to stand on their own, and are commonly called standing pouches. This ability makes it easier to display products, allows for a larger capacity for the packaging bag, and also makes it easier to remove the contents.

Another form of liquid container is glass or plastic bottles, which are commonly used in the toiletry sector, for example, for detergents and shampoos. However, with the recent rise in awareness of environmental issues, there has been a strong movement to reduce the amount of waste and incineration, and issues have been raised regarding the disposal or incineration of these bottles after the contents have been removed.

In response to this, packaging bags have been devised to be used as refill containers for glass and plastic bottles, and this has already been commercialized and is widely used on the market.

However, when opening a packaging bag to remove the contents, it is necessary to tear part of the bag to create an opening, which can be done by cutting with a blade or by using fingers, which requires the use of both hands and is not very convenient. Furthermore, after tearing, part of the packaging bag inevitably separates and becomes litter.

Patent Document 1 proposes a packaging bag in which substrates each having a sealant layer are stacked with the sealant layers facing each other, the periphery of the body is sealed, and a branch is formed that protrudes from the front side of the body, with a spout provided at the branch. However, when opening the bag, the tip of the spout must be cut to create an opening, which is cumbersome. Furthermore, the problem of the cut-off tip scattering remains unresolved, and these operations pose a risk of the contents scattering and sticking to fingers and the surrounding area.

Japanese Patent Application Laid-Open No. 2018-052592

The present invention was made in consideration of these circumstances, and aims to provide a packaging bag in which a storage compartment and a spout are formed by sealing the peripheral edges of a front laminate and a rear laminate, and in which the spout can be easily opened and the contents poured out using only one hand.

As a means for solving the above problem, the invention described in claim 1 is:
A packaging bag having a body portion formed by placing the sealant layers of a front laminate and a rear laminate, each having a plastic film and a sealant layer, opposite each other and sealing the peripheries of the laminate to form a storage section,
the front laminate comprises a laminate continuing from the upper portion and a laminate continuing from the lower portion, the sealant layers of these laminates are opposed to each other, the peripheral portions thereof are sealed, and a branch portion branching from the body portion is provided;
The branched portion can be bent vertically relative to the body portion, and an openable spout is formed at its tip. The inside of the branched portion is connected to the storage portion, and the spout has an easily peelable portion that is sealed with a peel strength that is smaller than the peel strength of other seals. This is a packaging bag.

The invention described in claim 2 is as follows:
The packaging bag according to claim 1, wherein a bottom film made of a laminate having a plastic film and a sealant layer is inserted between the front laminate and the rear laminate in the lower part of the body portion, and the bottom is formed by sealing, making the bag self-standing.

The invention described in claim 3 is as follows:
3. The packaging bag according to claim 1, wherein the easily peelable portion includes an easy-peel film between the opposing laminate and the sealant layer, and the easy-peel portion is sealed with the sealant layer.

The invention described in claim 4 is as follows:
The packaging bag according to any one of claims 1 to 3, wherein the peel strength of the easily peelable portion is 15 N/15 mm or less.

The invention described in claim 5 is as follows:
In the packaging bag according to any one of claims 1 to 4, the peel strength of the easily peelable portion increases from the inside to the outside of the branch portion.

The invention described in claim 6 is as follows:
The packaging bag according to any one of claims 1 to 5, which has a constriction for gripping with a hand.

This invention provides a packaging bag in which the storage compartment and spout are formed by sealing the peripheral edges of the front and rear laminates, making it possible to provide a packaging bag in which the spout can be easily opened and the contents poured out using only one hand.

FIG. 1 is a perspective (partially see-through) schematic view of one embodiment of a packaging bag according to the present invention, seen from the front side of the body, for illustrating an unopened state filled with contents. FIG. 2 is a perspective (partially see-through) schematic diagram of one embodiment of the packaging bag according to the present invention, seen from the front side of the body, illustrating the state in which the upper part of the body is folded and the branch part is made upright for opening. FIG. 3 is a perspective (partially see-through) schematic view of one embodiment of the packaging bag according to the present invention, seen from the front side of the body, for illustrating the state in which the spout at the tip of the branch is opened. FIG. 4 is a perspective (partially see-through) schematic diagram of one embodiment of the packaging bag according to the present invention, seen from the front side of the body, for illustrating the state of pouring out of the contents after opening. FIG. 5 is a perspective (partially see-through) schematic view seen from the front side of the body portion for explaining another embodiment of the packaging bag according to the present invention.

The present invention will now be described in more detail with reference to Figures 1 to 5. However, the present invention is not limited to the examples shown here. The present invention is defined by the claims.

Figure 1 is a schematic perspective view (partially see-through) of one embodiment of a packaging bag according to the present invention, viewed from the front side of the body, illustrating the unopened state filled with contents.

The present invention relates to a packaging bag (100) composed of a laminate with a plastic film base and a sealant layer. Therefore, it is possible to store liquids and other fluids as contents (30), and it has a pour spout (22).

The packaging bag (100) is composed of a body portion (10), a bottom portion (2), and a branch portion (20). The packaging bag (100) is manufactured by sealing the peripheral edges of the body front side (5) and body back side (6) with the sealant layers of the laminate facing each other to form a sealed portion (1), allowing the contents (30) to be stored in the space between the body front side (5) and body back side (6). In the example shown in Figure 1, the contents (30) are stored in the portion from the bottom (2) of the packaging bag (100) to the liquid level (31).

The example shown in Figure 1 is a case where the packaging bag (100) is self-supporting, and a bottom film (3) made of a laminate with a plastic film base and a sealant layer is inserted and sealed between the front side (5) and back side (6) of the body at the bottom (2) to form a bottom surface (4) at the bottom (2) of the packaging bag (100), allowing the packaging part (100) to stand on its own. The bottom film (3) can be inserted with the fold line (7) folded.

In other words, by expanding the bottom film (3), a bottom surface (4) is formed on the bottom portion (2) of the packaging bag (100), making it possible for the packaging bag (100) to stand on its own.

The bottom film (3) is inserted and sealed to form the bottom surface (4) of the packaging bag (100), making the packaging bag (100) self-standing, which makes it easy to display the product and the packaging bag (
It is possible to increase the capacity of the container (100), and it is also possible to provide excellent convenience in taking out the contents (30).

The expansion of the bottom film (3) may be due to, for example, the weight of the filled contents (30). There are no particular restrictions on the shape of the bottom film (3), as long as the bottom (2) is sealed and the bottom film (3) is expandable to enable the packaging bag (100) to stand on its own.

The top edge of the body (10) is a filling port through which the contents (30) are filled. After sealing both side edges and the bottom (2), the contents (30) are filled, and then the seal portion (1) on the top edge is sealed to seal the entire packaging bag (100).

The packaging bag (100) according to the present invention is composed of a laminate with a plastic film as the base material. The plastic film is a film made of a polymer resin composition, such as polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), or polyimide, and can be selected appropriately depending on the application and purpose.

In particular, polypropylene and polyethylene terephthalate are preferable plastic films in terms of film strength and cost. Furthermore, using oriented polyamide film in the laminate can impart toughness to the laminate against punctures and impacts.

In addition to forming a film from molten resin and laminating it directly, plastic films can also be laminated to other layers via an adhesive layer to form a laminate. Therefore, the layer structure, material composition, thickness, etc. of the laminate can be designed appropriately depending on the required quality of the packaging bag (100).

The packaging bag (100) according to the present invention is particularly characterized by the branching portion (20). Therefore, we will now provide a detailed explanation of the branching portion (20).

On the outer side of the body (5), the laminate continuing from the upper part of the outer side of the body (5) and the laminate continuing from the lower part of the outer side of the body (5) meet at a position above the center of the packaging bag (100), with the sealant layers overlapping and facing each other, and the side seals (21) on both the left and right sides and the spout seal (23) at the tip are sealed to form a branching section (20). In the example shown in Figure 1, the position above the center of the packaging bag (100) is indicated by the branching height position (A).

The spout (22) on the branching portion (20) is continuous with the space between the front side (5) and the back side (6) of the body that can store the contents (30). The branching portion (20) protrudes from the front side (5) of the body and can be bent upward and downward. In the example shown in Figure 1, it is bent upward at the branch height position (A).

Therefore, in the example shown in Figure 1, of the two surfaces, front and back, of the branching portion (20), the laminate continuing from the lower part of the outer body side (5) is visible, while the laminate continuing from the upper part of the outer body side (5) is on the reverse side and is not visible.

The seal portion (23) of the spout (22) at the tip of the branch portion (20) is an easily peelable portion with a lower peel strength than the seal portion (1) around the periphery of the body (10) and the side seal portion (21) of the branch portion (20).

Because this part is an easily peelable portion, when the packaging bag (100) is filled with the contents (30) and pressure is applied from the outside using, for example, fingers, the contents (30) act as internal pressure pushing the packaging bag (100) from the inside, and the weak part, the seal part (23) of the spout, is broken from the inside of the branch part (20), creating an opening and allowing the bag to be opened. Details of opening the packaging bag (100) using pressure from the inside and pouring out the contents (30) will be described later.

The branch (30) is separated from the body (10) of the packaging bag (100), i.e., is arranged branched off, and the contents (30) are filled below the body (10), with a space at the top (11) of the body (10) or at the tip of the branch (20).

Therefore, even if the packaging bag (100) is accidentally subjected to pressure or impact from the outside, this space effectively cushions the impact of the pressure, preventing the external force from acting directly on the weak spot of the spout seal (23), and effectively preventing the spout (22) from being accidentally opened.

If necessary, for example, to improve the shelf life of the contents (30), an opaque layer that blocks ultraviolet light, such as a colored film, can be provided in the laminate. Alternatively, a gas barrier layer can be provided in the laminate. Also, a gas barrier film can be used, for example, in which a gas barrier layer is provided on the surface of a plastic film.

The sealant layer of the laminate that makes up the packaging bag (100) can be sealed by stacking two laminates with the sealant layers facing each other. For example, they can be heat-sealed by applying heat and pressure to bond them together, allowing the packaging bag (100) to be made and sealed.

Polyolefin-based thermoplastic resins are commonly used as materials for the sealant layer. Specific examples include ethylene-based resins such as low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-alpha-olefin copolymer, and ethylene-methacrylic acid copolymer; blends of polyethylene and polybutene; and polypropylene-based resins such as homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-alpha-olefin copolymer.

To form the sealant layer, for example, a film of molten resin can be formed using an extruder or the like, and the layer can be formed directly on the laminate. Alternatively, a sealant layer can be formed on the surface of the laminate by laminating a sealant material that has already been formed into a film.

Figure 2 is a schematic perspective view (partially see-through) of one embodiment of the packaging bag according to the present invention, seen from the front side of the body, illustrating the state in which the upper part of the body is folded and the branch part is set upright for opening.

The packaging bag (100) according to the present invention can be opened by applying pressure from the outside of the packaging bag (100). Prior to this pressure from the outside, the upper part (11) of the body part (10) of the packaging bag (100) is folded in the folding direction (50) indicated by the dashed arrow in the figure.
This can be done after folding the inside of the body (6) of the bag (00).

Also, as shown in Figure 2, the packaging bag (100) can be opened by turning it upside down and applying pressure from the outside of the packaging bag (100). In this case, for example, when transferring the contents (30) to another container, the spout (22) of the packaging bag (100) can be aligned with the opening of the destination container, the bag can be opened, and the contents (30) can be poured out to perform the transfer.

Figure 3 is a schematic perspective view (partially see-through) of one embodiment of the packaging bag according to the present invention, viewed from the front side of the body, illustrating the state of opening the spout at the tip of the branch.

As mentioned above, the packaging bag (100) according to the present invention can be opened by applying pressure from the outside of the packaging bag (100). That is, as shown by the pressure direction (51) indicated by the arrow in the figure, pressure can be applied from the outside of the packaging bag, for example, to both side edges of the body portion (10), to increase the liquid pressure of the contents (30).

The increased liquid pressure presses the packaging bag (100) evenly from the inside, but the seal (23) at the spout at the tip of the branch (20) is an easily peelable portion with a lower seal peel strength than the seal (1) around the periphery of the body (10) and the side seal (21) at the branch (20). Therefore, this weak portion breaks, forming an opening that leads from the inside of the packaging bag (100) to the outside, and the bag is opened. After opening, this becomes the spout (22) through which the contents can be poured out.

Furthermore, in the packaging bag (100) according to the present invention, the easily peelable portion of the spout (22) can be constructed by placing an easy-peel film between the opposing laminates and sealing it with the sealant layer.

When a weak part is constructed in this way, fluctuations and variations in sealing conditions can be eliminated, allowing for a more stable weak part to be constructed, resulting in a stable peel strength for the easily peelable part.

Furthermore, in the packaging bag (100) according to the present invention, the easily peelable portion of the spout (22) can have a peel strength of 15 N/15 mm or less, which is within the range in which the easily peelable portion can be easily opened by applying pressure to the body (10) of the packaging bag (100) with one hand. For example, even elderly people and those with weak grip strength can easily open the packaging bag (100), making it a highly convenient opening mechanism.

Furthermore, the easily peelable portion of the spout (22) can be designed so that the peel strength increases from the inside to the outside of the packaging bag (100).

When designed in this way, opening by destruction of the easily peelable portion, i.e., the fragile portion, is not instantaneous or explosive, but occurs smoothly and sequentially from the inside to the outside of the packaging bag (100), effectively eliminating the risk of the contents spilling out when the bag is opened.

Figure 4 is a schematic perspective view (partially see-through) of one embodiment of the packaging bag of the present invention, viewed from the front side of the body, to illustrate the state of the contents pouring out after opening.

The example of the packaging bag (100) shown in Figure 4 is a refill bag, and shows the state in which the contents (30) are being refilled into the destination container (40).

In this way, the contents (30) can be poured out through the opening (24) formed by hydraulic pressure from inside the packaging bag (100), and the spout (22) is positioned toward the opening (41) of the refill container (40).

The contents (30) naturally fall in the pouring direction (52) due to the weight of the contents and the external air pressure acting on the packaging bag (100), but it is also possible to accelerate the pouring by applying pressure to the body of the packaging bag (100), for example, in the direction of the arrow (51) in the figure.

In this way, the packaging bag (100) of the present invention is made of a laminate with a plastic film base and a sealant layer, and can be easily opened and its contents poured out using only the fingers of one hand.

In other words, this packaging bag (100) can be grasped with one hand, opened, and poured out as is. Therefore, for example, it can be placed in the opening (41) of the refill container (40) and poured out as is, and it is also possible to accelerate the pouring by applying pressure with one hand.

Figure 5 is a schematic perspective view (partially see-through) of another embodiment of the packaging bag according to the present invention, viewed from the front side of the body portion.

The example shown in Figure 5 is an example in which the body portion (10) of the packaging bag (100) is formed in a shape that is easy to grip with the fingers of one hand. In other words, this is an example in which a waist portion (8) is formed in the body portion (10) to make it easier to grip and apply pressure with the palm of your hand.

In the branched portion (20), similar to the example of the packaging bag (100) shown in Figure 1, the laminate continuing from the upper part of the outer side of the body (5) and the laminate continuing from the lower part of the outer side of the body (5) meet above the center of the packaging bag (100), with the sealant layers overlapping and facing each other, sealing the side seals (21) on both the left and right sides and the spout seal (23) at the tip of the branched portion (20).

Furthermore, as in the example shown in Figure 1, the spout (22) of the branching portion (20) is continuous with the space between the front side (5) of the body and the back side (6) of the body, the branching portion (20) protrudes from the front side (5) of the body and can be bent in the vertical direction, and the seal portion (23) of the spout at the tip of the branching portion (20) is an easily peelable portion with a lower seal peel strength than the seal portion (1) around the periphery of the body and the side seal portion (21) of the branching portion (20).

In the packaging bag (100) according to the present invention, the bottom (2) is provided with a bottom film (3), which can be expanded to form the bottom surface (4), thereby providing the packaging bag (100) with self-supporting properties. The expansion of the bottom film (3) may be due to, for example, the weight of the contents (30) filled inside.

In addition, a bottom film (3) composed of a laminate having a plastic film base and a sealant layer is inserted and sealed between the front side (5) and the back side (6) of the body at the bottom (2) of the body (10), thereby sealing the bottom (2) of the packaging bag (100). Considering that the packaging bag (100) can be made self-standing, there are no particular restrictions on its shape.

In the example of the packaging bag (100) shown in Figure 5, the packaging bag (100) can also be opened by applying pressure from the outside of the packaging bag (100). Prior to this pressure from the outside, the upper part (11) of the body of the packaging bag (100) is folded in the folding direction (53) as shown by the dashed arrow in the figure.
This can be done after folding the bag (100) in the direction of the arrows toward the back side (6) of the body of the bag (100).

Furthermore, for example, when transferring the contents (30) into another container, the spout (22) of the packaging bag (100) can be aligned with the opening (41) of the destination container (40), and the contents (30) can be poured out immediately after opening.

In this way, if the shape of the body (10) of the packaging bag (100) is made more suitable for gripping with one hand, gripping, opening, and removing the contents (30) of the packaging bag (100) can be performed more easily and stably, which is effective in further improving convenience.

In other words, even in the example shown in Figure 5, the packaging bag (100) can be grasped and opened with one hand, and because the shape of the body portion (10) is more suitable for holding the body portion with the palm of the hand, pressure can be applied effectively to open it.

Furthermore, after opening, the contents can be poured out directly. Therefore, for example, it can be placed at the opening (41) of the refill container (40) to open and pour out, and pouring can be accelerated by applying pressure with the fingers.

In this way, the packaging bag according to the present invention is a packaging bag in which the storage compartment and spout are formed by sealing the peripheral edges of the front laminate and rear laminate, making it possible to provide a packaging bag in which the spout can be easily opened and the contents poured out using only one hand.

1...Sealed portion 2...Bottom 3...Bottom film 4...Bottom surface 5...Front side of body 6...Back side of body 7...Fold line 8...Narrowed portion 10...Body 11...Upper portion 20...Branched portion 21...Side seal portion 22...Spout 23...Sealed portion of spout 24...Opening 30...Contents 31...Liquid level 40...Refill container 41...Opening 50...Folding direction 51...Pressing direction 52...Pour direction 53...Folding direction 100...Packaging bag A...Branched height position

Claims (8)

A packaging bag having a body portion formed by placing the sealant layers of a front laminate and a rear laminate, each having a plastic film and a sealant layer, opposite each other and sealing the peripheries of the laminate to form a storage section,
the front laminate comprises a laminate continuing from the upper portion and a laminate continuing from the lower portion, the sealant layers of these laminates are opposed to each other, the peripheral portions thereof are sealed, and a branch portion branching from the body portion is provided;
The branched portion can be bent in the vertical direction relative to the body portion, and an openable spout is formed at the tip of the branched portion. The inside of the branched portion is connected to the storage portion, and the spout has an easily peelable portion sealed with a peel strength smaller than the peel strength of other seals.
a length in the vertical direction of the branch portion is shorter than a length in the vertical direction of an upper portion of the body portion where the stack continuing from the upper portion and the rear stack are sealed,
The packaging bag , wherein the peel strength of the easily peelable portion increases from the inside to the outside of the branch portion . The packaging bag according to claim 1, wherein a bottom film made of a laminate having a plastic film and a sealant layer is inserted between the front laminate and the rear laminate in the lower part of the body portion, and the bottom is formed by sealing, making the bag self-standing. The packaging bag according to claim 1 or 2, wherein the easily peelable portion has an easy-peel film between the opposing laminate and is sealed with the sealant layer. The packaging bag according to any one of claims 1 to 3, wherein the peel strength of the easily peelable portion is 15 N/15 mm or less. The packaging bag according to any one of claims 1 to 4 , which has a constriction for gripping with a hand. the laminated body continuing from the lower part and constituting the branching portion is arranged so as to be visible at the branching portion,
The packaging bag according to any one of claims 1 to 5 , wherein the laminate continuing from the upper portion and constituting the branched portion faces the body portion at the branched portion. A packaging bag as described in any one of claims 1 to 6, wherein the spout formed at the tip of the branched portion is located on the upper side of the body portion relative to the folding portion at which the branched portion can be folded in the vertical direction relative to the body portion . A packaging bag having a body portion formed by placing the sealant layers of a front laminate and a rear laminate, each having a plastic film and a sealant layer, opposite each other and sealing the peripheries of the laminate to form a storage section,
the front laminate comprises a laminate continuing from the upper portion and a laminate continuing from the lower portion, the sealant layers of these laminates are opposed to each other, the peripheral portions thereof are sealed, and a branch portion branching from the body portion is provided;
The branched portion can be bent in the vertical direction relative to the body portion, and an openable spout is formed at the tip of the branched portion. The inside of the branched portion is connected to the storage portion, and the spout has an easily peelable portion sealed with a peel strength smaller than the peel strength of other seals.
The packaging bag, wherein the peel strength of the easily peelable portion increases from the inside to the outside of the branch portion.