JP7803559B2 - Inflation bag with tear stop function - Google Patents

Description

This invention relates to a packaging bag with a tear notch.

Generally, when commercial raw materials (e.g., food ingredients such as rice, flour, and breadcrumbs) are delivered to processing facilities (e.g., food processing factories, central kitchens, kitchens of restaurant chains, etc.), they are often delivered in packaging bags made of resin film. The packaging bags delivered to the processing facility are then opened by workers at the processing facility, and the contents of the opened packaging bags are placed into commercial cooking equipment or ingredient processing machines. However, if scissors or other tools are used to open the packaging bags, there is a risk that the tools will accidentally get into the commercial cooking equipment or ingredient processing machines.

Patent Documents 1 and 2 disclose packaging bags that can be opened by hand without using tools such as scissors.

As shown in Figure 11, the packaging bags in Patent Documents 1 and 2 have a bag body 21 formed from a tubular resin film 20 extending in the vertical direction, and an opening notch 24 formed in one of the side edges 22 (the left side in the figure) of the side edges 22, 23 on both the left and right sides of the bag body 21.

The tubular film 20 forming the bag 21 is made by flattening a tubular inflation film consisting of an outer layer primarily composed of polyethylene, a middle layer primarily composed of a cyclic olefin resin and polyethylene, and an inner layer primarily composed of polyethylene, with both the left and right sides folded in half. This gives the bag 21 a straight-line tearability, meaning that when the bag 21 is opened by tearing it from the tear notch 24 on one side edge 22 (the left side in the figures) toward the other side edge 23 (the right side in the figures), it tears in a straight line perpendicular to the up-down direction, as shown in Figures 12 and 13.

Japanese Patent Application Publication No. 7-329991 Utility Model Registration No. 3183912

As shown in Figure 12, when the bag 21 is torn open from the tearing notch 24 on one side edge 22 (the left side in the figure) toward the other side edge 23 (the right side in the figure), the bag 21 is separated into a torn piece 25 and a main bag body 26, as shown in Figure 13. Therefore, when a processing equipment worker opens the bag 21 and places the contents of the opened packaging bag into a commercial cooking appliance or ingredient processing machine, there is a risk that the torn piece 25 shown in Figure 13 will accidentally get into the commercial cooking appliance or ingredient processing machine.

In order to reduce the risk of contamination with remnants 25 of bag bodies 21, some processing facilities have adopted rules requiring that the remnants 25 and bag bodies 26 are left behind after opening rather than discarded, and that the number of remnants 25 and the number of bag bodies 26 are then checked to see if they match, and that the results of this check are recorded in a daily work log or similar.

When tearing open the bag 21 shown in Figure 11 from the tearing notch 24 on one side edge 22 (the left side in the figure) toward the other side edge 23 (the right side in the figure), one method of preventing the torn pieces 25 from separating from the bag body 26 after opening can be considered by stopping the tearing of the bag 21 just before the bag 21 is completely separated into the top and bottom. However, because workers at processing equipment typically have to complete many tasks in a short amount of time, they tend to tear the bag 21 all the way to the end in one go when tearing it open, making it difficult to stop the tearing midway.

The problem this invention aims to solve is to provide a packaging bag with a tear-off notch that can reduce the risk of bag fragments becoming mixed in.

In order to solve the above problems, the present invention provides a packaging bag with a tear notch having the following configuration.
[Configuration 1]
a bag body formed of a resin tubular film extending in the vertical direction and having an internal storage space for storing contents;
an opening notch formed on one of the left and right side edges of the bag body,
In a packaging bag with a tear notch, the bag body is given a straight cut property that causes the bag to tear straight in a direction perpendicular to the up-down direction when the bag body is torn from the tear notch toward the other of the left and right side edges of the bag body to open it,
A packaging bag with an opening notch is characterized in that a tear-stop slit that intersects with an imaginary tear line that extends straight from the opening notch toward the other side edge is formed near the other side edge of the bag body.

When this configuration is adopted, the bag is torn from the opening notch on one side edge toward the other side edge, and when the tip of the tear reaches the tear-stop slit, the tear-stop slit prevents further tearing and stops the tearing of the bag. This makes it possible to open the bag without completely separating the top and bottom, reducing the risk of bag fragments becoming mixed in.

[Configuration 2]
The packaging bag with an opening notch according to configuration 1, wherein the bag body is formed with a stopper-enclosing seal portion that separates the storage space from the tear-stop slit so that the contents in the storage space do not spill out through the tear-stop slit.

By adopting this configuration, a stopper-enclosing seal that separates the storage space from the tear-stop slit is formed on the bag, making it possible to prevent the contents of the storage space in the bag from spilling out of the bag through the tear-stop slit before the bag is opened.

[Configuration 3]
The tubular film is formed by flattening a tubular inflation film that is integrally molded without seams in the circumferential direction so that both the left and right sides are folded in half, and is composed of a front film located on the front side and a back film located on the back side, with the folded part as the boundary,
the stopper-enclosing seal portion is formed so as to avoid the position of the tear-stop slit so that the front film and the back film are not adhered to each other at the position of the tear-stop slit;
3. The packaging bag with a tear-stop notch according to claim 2, wherein the tear-stop slit is formed through the front film and the back film, which are not bonded to each other.

When this configuration is adopted, the front and back films are not bonded to each other at the location of the tear-stop slit, and the tear-stop slit is formed through the front and back films. Therefore, when the bag is torn from the opening notch on one side edge toward the other side edge and the tip of the tear reaches the tear-stop slit, the tear-stop slit in the front film prevents further tearing of the front film, and the tear-stop slit in the back film prevents further tearing of the back film. The tear-stopping effects of the front and back films together make it possible to reliably stop the tearing of the bag.

[Configuration 4]
The packaging bag with a tear notch according to configuration 3, wherein the tubular film is formed from the multilayer inflation film consisting of an outer layer mainly composed of polyethylene, an intermediate layer mainly composed of a cyclic olefin resin and polyethylene, and an inner layer mainly composed of polyethylene.

This effectively imparts straight-line tearing ability, meaning that when the bag is opened by tearing it from the opening notch on one side edge toward the other side edge, it tears in a straight line perpendicular to the up-down direction.

[Configuration 5]
The packaging bag with an opening notch according to any one of configurations 2 to 4, wherein the stopper-enclosing seal portion extends in the vertical direction, intersecting the intended tear line between the opening notch and the tear-stop slit, and the upper end of the stopper-enclosing seal portion is connected to the other side edge of the bag body above the intended tear line, and the lower end of the stopper-enclosing seal portion is connected to the other side edge of the bag body below the intended tear line.

By adopting this configuration, it is possible to reliably separate the portion of the bag where the tear-stop slit is formed from the storage space inside the bag.

[Configuration 6]
The packaging bag with a tear notch according to configuration 5, wherein the stopper-enclosing seal portion is formed in an arc shape with a central angle of 130° or less, the chord of which is the side edge on the other side of the bag body.

When this configuration is adopted, the stopper-enclosing seal is a flat arc, so after the bag is opened by tearing from the opening notch on one side edge to the tear-stop slit near the other side edge, when the opening of the bag is turned downwards and the contents of the bag are poured into a commercial cooking appliance, ingredient processing machine, etc., the contents of the bag are less likely to get caught on the stopper-enclosing seal, allowing for smooth pouring.

[Configuration 7]
A packaging bag with an opening notch as described in any one of configurations 1 to 6, wherein the tear stop slit is formed in a curved arc shape so as to gradually move away from the other side edge of the bag body from the position where it intersects with the intended tear line upward and downward.

In this way, the tear-stop slit is shaped so that it gradually moves away from the other side edge of the bag body upward and downward from the point where it intersects with the intended tear line, making it easy to ensure the distance from the upper end of the tear-stop slit to the other side edge of the bag body, and the distance from the lower end of the tear-stop slit to the other side edge of the bag body. Therefore, even if an unexpected force acts on the tear-stop slit area of the bag body, it is possible to prevent the bag body from tearing from the upper or lower end of the tear-stop slit to the other side edge of the bag body.

The packaging bag with tear notches of this invention tears the bag body from the tear notch on one side edge toward the other side edge. When the tip of the tear reaches the tear-stop slit, the tear-stop slit prevents further tearing and stops the tearing of the bag body. This makes it possible to open the bag body without completely separating the top and bottom, reducing the risk of bag fragments getting mixed in.

A front view of a packaging bag with an opening notch according to an embodiment of the present invention. FIG. 2 is an enlarged view of the vicinity of the tear-stop notch and the tear-stop slit of the packaging bag with the tear-stop notch of FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 2 is a diagram showing a state in which the bag is being torn starting from the tear notch shown in FIG. 1 . FIG. 5 is a diagram showing a state in which the tear tip of FIG. 4 has reached the tear-stop notch. FIG. 6 is a diagram showing a state in which the torn portion (the portion above the tearing position) resulting from tearing the bag body shown in FIG. 5 and the bag body (the portion below the tearing position) are arranged vertically. FIG. 2 is a diagram showing a first example of the packaging bag with opening notches shown in FIG. 1 in an unused state (before contents are placed inside); FIG. 2 is a diagram showing a second example of the packaging bag with the opening notch shown in FIG. 1 in an unused state (before contents are placed inside); FIG. 2 is a diagram showing a third example of the packaging bag with the opening notch shown in FIG. 1 in an unused state (before contents are placed inside); FIG. 10 is a diagram showing a fourth example of the packaging bag with the opening notch shown in FIG. 1 in an unused state (before contents are placed inside); Front view of a conventional packaging bag with a tear notch 12 is a diagram showing a state in which the bag is being torn starting from the tearing notch shown in FIG. 11 . FIG. FIG. 12 is a diagram showing the state in which the packaging bag with the opening notch shown in FIG. 11 has been opened.

Figure 1 shows a packaging bag with a tear notch according to an embodiment of the present invention (sealed with contents inside). This packaging bag with a tear notch has a bag body 2 with an internal storage space 1 (see Figure 3) for storing contents, a tear notch 5 formed in one of the side edges 3, 4 of the bag body 2 (the left side in the figure), and a tear-stop slit 6 formed near the side edge 4 on the other side (the right side in the figure) of the bag body 2.

The bag 2 is formed into a vertically elongated rectangle. This bag 2 is a commercial packaging bag used when delivering commercial raw materials (e.g., granular food ingredients such as rice, flour, breadcrumbs, etc.) to processing facilities (e.g., food processing factories, central kitchens, kitchens of restaurant chains, etc.). When empty, the width of the bag 2 in the left-to-right direction is set to 25 cm or more, and the length of the bag 2 in the up-to-down direction is set to 40 cm or more.

The bag body 2 comprises a resin tubular film 7 extending in the vertical direction, a top seal portion 8 formed at the upper end of the tubular film 7, and a bottom seal portion 9 formed at the lower end of the tubular film 7. The top seal portion 8 is the portion where the upper end of the tubular film 7 is sealed by heat sealing, and the bottom seal portion 9 is the portion where the lower end of the tubular film 7 is sealed by heat sealing. A long, narrow rectangular mark 14 (a so-called phototube mark) is printed perpendicular to the vertical direction at a position a predetermined distance (e.g., 30 mm) above the lower edge of the bag body 2.

The tubular film 7 is formed by flattening a cylindrical inflation film that is seamlessly molded in the circumferential direction and folded in half on both the left and right sides. The folded portion defines a front film 10 on the front side and a back film 11 on the back side (see Figure 3). The folded portions on both the left and right sides of the tubular film 7 form the left and right side edges 3, 4 of the bag body 2.

The blown film constituting the tubular film 7 is multilayered and includes an outer layer primarily composed of polyethylene, a middle layer primarily composed of a cyclic olefin resin and polyethylene, and an inner layer primarily composed of polyethylene. The polyethylene contained in the outer, middle, and inner layers is low-density polyethylene, and the cyclic olefin resin accounts for 50% by weight or more of the middle layer. This multilayer blown film uses polyethylene, a resin with physical properties of viscosity and elongation, for the outer and inner layers, and a cyclic olefin resin, a resin with physical properties of low viscosity and brittleness, for the middle layer. This makes it possible to impart straight-cutting properties to a blown film made of polyethylene resin, which is resistant to punctures and impacts. This blown film possesses bidirectional straight-cutting properties, allowing it to be torn straight in both the vertical direction (MD) and the direction perpendicular to the vertical direction (TD).

This straight-line cutting ability allows the bag 2 to be torn in a straight line perpendicular to the up-down direction when opening it by starting from the tearing notch 5 on one side edge 3 (the left side in the figure) and tearing toward the other side edge 4 (the right side in the figure), as shown in Figure 4.

In this embodiment, the tubular film 7 forming the bag body 2 is provided with two-way straight-cut properties, meaning that it can be torn straight in two directions, the vertical direction (MD direction) and the direction perpendicular to the vertical direction (TD direction), but cannot be torn straight in any other direction. However, the tubular film 7 forming the bag body 2 may also be provided with one-way straight-cut properties, meaning that it can be torn straight only in the direction perpendicular to the vertical direction (TD direction), but cannot be torn straight in any other direction.

As shown in Figure 1, the top seal 8 is formed continuously and uninterrupted across the entire width of the bag body 2, from the side edge 3 on one side (the left side in the figure) of the bag body 2 to the side edge 4 on the other side (the right side in the figure). The top seal 8 is a linear portion of the upper end of the tubular film 7 that is heat-sealed (thermally welded) in a direction perpendicular to the up-down direction, with a width of 0.8 mm to 3.2 mm (preferably 2.2 mm or less).

Similarly, the bottom seal 9 is formed continuously and uninterrupted across the entire width of the bag body 2, from the side edge 3 on one side (the left side in the figure) of the bag body 2 to the side edge 4 on the other side (the right side in the figure). The bottom seal 9 is a linear heat-sealed portion of the lower end of the tubular film 7 that extends in a straight line perpendicular to the up-down direction, with a width of 0.8 mm to 3.2 mm (preferably 2.2 mm or less).

As shown in Figure 2, the tear notch 5 is a cut formed in the side edge 3 on one side (the left side in the figure) of the bag body 2, and this tear notch 5 allows the bag body 2 to be opened by manually tearing it from the side edge 3 on one side (the left side in the figure). The tear notch 5 is located in an area within 50 mm below the top seal portion 8. As shown in Figure 3, the tear notch 5 is formed to penetrate the front film 10 and the back film 11.

As shown in Figure 2, the tear-stop slit 6 is a slit that extends so as to intersect with an imaginary tear line L (an imaginary straight line perpendicular to the up-down direction) that extends straight from the opening notch 5 toward the side edge 4 on the other side (the right side in the figure). The tear-stop slit 6 is formed away from the side edge 4 on the other side (the right side in the figure) of the bag body 2 to one side (the left side in the figure) so as not to overlap the side edge 4 on the other side (the right side in the figure) of the bag body 2. The tear-stop slit 6 is positioned so that the entire slit is contained within an area no more than 20 mm toward one side (the left side in the figure) from the side edge 4 on the other side (the right side in the figure) of the bag body 2.

The tear-stop slit 6 is formed in an arc-like shape that curves upward and downward from the position where it intersects with the intended tear line L, gradually moving away from the side edge 4 on the other side of the bag body 2 (the right side in the figure). The tear-stop slit 6 may have any other shape as long as it extends to intersect with the intended tear line L. For example, it may be formed in a straight line that extends upward and downward from the position where it intersects with the intended tear line L. As shown in Figure 3, the tear-stop slit 6 is formed to penetrate both the front film 10 and the back film 11.

As shown in Figure 2, a notch-surrounding seal 12 is formed around the tear notch 5 of the bag body 2 to separate the storage space 1 (see Figure 3) from the tear notch 5 so that the contents contained in the storage space 1 do not spill out of the tear notch 5. The notch-surrounding seal 12 is a linear portion where the front film 10 and the back film 11 (see Figure 3) are heat-sealed together, extending to surround the tear notch 5 with a width of 0.8 mm to 2.2 mm.

The notch-enclosing seal 12 is formed in an arc shape with a central angle of 130° or less, with the side edge 3 on one side (the left side in the figure) of the bag body 2 as the chord. Here, the notch-enclosing seal 12 extends in the vertical direction, intersecting the intended tear line L between the opening notch 5 and the tear-stop slit 6, with the upper end of the notch-enclosing seal 12 connecting to the side edge 3 on one side (the left side in the figure) of the bag body 2 above the intended tear line L, and the lower end of the notch-enclosing seal 12 connecting to the side edge 3 on one side (the left side in the figure) of the bag body 2 below the intended tear line L.

A stopper-enclosing seal 13 is formed around the tear-stop slit 6 of the bag body 2 to separate the storage space 1 (see Figure 3) of the bag body 2 from the tear-stop slit 6, preventing the contents stored in the storage space 1 from spilling out through the tear-stop slit 6. The stopper-enclosing seal 13 is a linear portion of the front film 10 and the back film 11 (see Figure 3) that is heat-sealed to surround the tear-stop slit 6 and has a width of 0.8 mm to 2.2 mm.

The stopper-enclosing seal portion 13 is formed to avoid the location of the tear-stop slit 6 so that the front film 10 and back film 11 (see Figure 3) are not adhered to each other at the location of the tear-stop slit 6. The tear-stop slit 6 is formed in the part of the front film 10 and back film 11 that is not adhered to each other.

The stopper-enclosing seal 13 is formed in an arc shape with a central angle of 130° or less, with the side edge 4 on the other side (right side in the figure) of the bag body 2 as the chord. Here, the stopper-enclosing seal 13 extends in the vertical direction, intersecting the intended tear line L between the opening notch 5 and the tear-stop slit 6, with the upper end of the stopper-enclosing seal 13 connecting to the side edge 4 on the other side (right side in the figure) of the bag body 2 above the intended tear line L, and the lower end of the stopper-enclosing seal 13 connecting to the side edge 4 on the other side (right side in the figure) of the bag body 2 below the intended tear line L.

This packaging bag with a tear notch is used to contain commercial raw materials (such as rice) and is delivered in that state to a processing facility (such as a central kitchen) where it is opened by workers at the processing facility. This opening operation is performed by tearing the bag 2 from the tear notch 5 on one side edge 3 (the left side in the figure) of the bag 2 shown in Figure 1 toward the other side edge 4 (the right side in the figure). As shown in Figure 4, the bag 2 is torn from the tear notch 5 on one side edge 3 (the left side in the figure) toward the other side edge 4 (the right side in the figure). When the tear reaches the tear stop slit 6 as shown in Figure 5, the tear stop slit 6 prevents further tearing, halting the tearing of the bag 2. Therefore, as shown in Figure 6, the bag 2 can be opened without completely separating the top and bottom halves, reducing the risk of fragments of the bag 2 becoming mixed in.

In particular, in this embodiment, the tubular film 7 forming the bag body 2 is an inflation film made of a polyethylene resin, which has the physical properties of being sticky and stretchy. Therefore, as shown in Figure 4, when a shear force in the thickness direction is applied to the tear tip of the bag body 2, the bag body 2 can be torn relatively easily. However, as shown in Figure 5, once the tear tip of the bag body 2 reaches the tear-stop slit 6, the force applied to the tear tip of the bag body 2 becomes primarily a tensile force rather than a shear force, preventing further tearing of the bag body 2 and effectively halting the tearing.

In addition, as shown in Figures 2 and 3, this packaging bag with an opening notch has a stopper-enclosing seal portion 13 formed in the bag body 2 that separates the storage space 1 from the tear-stop slit 6, making it possible to prevent the contents of the storage space 1 of the bag body 2 from spilling out of the bag body 2 through the tear-stop slit 6 before the bag body 2 is opened.

In addition, as shown in Figures 2 and 3, in this packaging bag with a tear notch, the front film 10 and the back film 11 are not bonded to each other at the location of the tear-stop slit 6, and the tear-stop slit 6 is formed through the front film 10 and the back film 11. Therefore, as shown in Figure 4, when the bag body 2 is torn from the opening notch 5 on one side edge 3 (the left side in the figure) toward the other side edge 4 (the right side in the figure), and the tip of the tear reaches the tear-stop slit 6, as shown in Figure 5, the tear-stop slit 6 in the front film 10 prevents further tearing of the front film 10, and the tear-stop slit 6 in the back film 11 prevents further tearing of the back film 11. The tear-stopping effects of the front film 10 and the back film 11 reliably stop the tearing of the bag body 2.

In addition, in this packaging bag with a tear notch, the tubular film 7 that forms the bag body 2 is formed from the multilayer inflation film consisting of an outer layer primarily composed of polyethylene, a middle layer primarily composed of a cyclic olefin resin and polyethylene, and an inner layer primarily composed of polyethylene.As a result, as shown in Figure 4, when the bag body 2 is opened by tearing it from the tear notch 5 on one side edge 3 (the left side in the figure) toward the other side edge 4 (the right side in the figure), it is possible to effectively impart straight-line tearing properties, meaning that the tear is made in a straight line perpendicular to the up-down direction.

In addition, as shown in Figure 1, this packaging bag with an opening notch has both a flat arc-shaped notch-enclosing seal 12 and a stopper-enclosing seal 13. Therefore, after tearing the bag 2 from the opening notch 5 on one side edge 3 (the left side in the figure) to the tear-stop slit 6 near the other side edge 4 (the right side in the figure), when the opening of the bag 2 is turned downward and the contents of the bag 2 are poured into a commercial cooking appliance, ingredient processing machine, etc., the contents of the bag 2 are less likely to get caught on the stopper-enclosing seal 13, allowing for smooth pouring.

In addition, as shown in Figure 2, this packaging bag with an opening notch has a shape in which the tear-stop slit 6 gradually moves away from the side edge 4 on the other side (the right side in the figure) of the bag body 2 upward and downward from the position where it intersects with the intended tear line L. This makes it easy to ensure the distance from the upper end of the tear-stop slit 6 to the side edge 4 on the other side (the right side in the figure) of the bag body 2, and the distance from the lower end of the tear-stop slit 6 to the side edge 4 on the other side (the right side in the figure) of the bag body 2. Therefore, even if an unexpected force is applied to the tear-stop slit 6 portion of the bag body 2, it is possible to prevent the bag body 2 from tearing from the upper or lower end of the tear-stop slit 6 to the side edge 4 on the other side (the right side in the figure).

Figures 7 to 10 show examples of packaging bags with opening notches according to the above embodiment in an unused state (i.e., before any contents are placed inside).

Figure 7 shows a packaging bag with a tear notch in the form of a single bag, in which only the top seal 8 of the top seal 8 and bottom seal 9 of the bag body 2 shown in Figure 1 has been pre-formed. A user who uses this packaging bag with a tear notch places the bag body 2 in the form of a single bag shown in Figure 7 in a filling and packaging machine (not shown), holds the bag body 2 in the filling and packaging machine with the top seal 8 facing downwards, fills the contents, and then forms the bottom seal 9. This results in the packaging bag with a tear notch in the state shown in Figure 1.

Figure 8 shows a packaging bag with a tear notch in the form of a single bag, in which only the bottom seal 9 of the top seal 8 and bottom seal 9 of the bag body 2 shown in Figure 1 has been pre-formed. A user who uses this packaging bag with a tear notch to package the bag body 2 in the form of a single bag shown in Figure 8 sets the bag body 2 in the filling and packaging machine, holds the bag body 2 with the bottom seal 9 facing downwards, fills the contents, and then forms the top seal 8. This results in the packaging bag with a tear notch in the state shown in Figure 1.

Figure 9 shows a packaging bag with a tear notch in the form of a continuous bag in which multiple bags are connected in a series, and which does not have either the top seal 8 or the bottom seal 9 shown in Figure 1. This packaging bag with a tear notch is delivered to the user in a rolled-up state. The user then loads the continuous bag body 2 (wound into a roll) shown in Figure 9 into a filling and packaging machine. The filling and packaging machine cuts the continuous bag unwound from the roll into individual bags at the positions indicated by the dotted lines in the figure, while simultaneously forming the bottom seal 9 of the bag body 2. At this time, the cutting of the continuous bag and the formation of the bottom seal 9 are performed using the position of mark 14 (the so-called photocell mark) as a reference. Next, the individual bag body 2 is held with the bottom seal 9 facing downwards and filled with the contents, after which the top seal 8 is formed. This results in the packaging bag with a tear notch in the state shown in Figure 1.

Figure 10 shows a packaging bag with a tear notch in the form of a continuous bag in which multiple bags are connected in a series. Of the top seal 8 and bottom seal 9 shown in Figure 1, only the top seal 8 has been pre-formed. This packaging bag with a tear notch is also delivered to the user in a rolled-up state. The user then loads the bag body 2 (wound into a roll) in the continuous bag state shown in Figure 10 into a filling and packaging machine, and the filling and packaging machine cuts the continuous bag unwound from the roll into individual bags at the positions indicated by the dotted lines in the figure. The cutting of the continuous bag is performed based on the position of mark 14 (the so-called photocell mark). Next, the bag body 2 in the single-bag state is held with the top seal 8 facing downwards and filled with the contents, after which the bottom seal 9 is formed. This results in the packaging bag with a tear notch in the state shown in Figure 1. In Figure 10, of the top seal portion 8 and bottom seal portion 9 shown in Figure 1, only the top seal portion 8 is pre-formed, but it is also possible to pre-form only the bottom seal portion 9.

1 Storage space 2 Bag body 3 One side edge 4 Other side edge 5 Opening notch 6 Tear stop slit 7 Cylindrical film 10 Front film 11 Back film 13 Stopper surrounding seal portion L Planned tear line

Claims (4)

a bag body (2) formed of a resin tubular film (7) extending in the vertical direction and having an internal storage space (1) for storing contents;
and an opening notch (5) formed on one of the side edges (3) of the left and right side edges (3, 4) of the bag body (2),
The cylindrical film (7) is formed by flattening a cylindrical inflation film of a polyethylene-based resin that is integrally molded without seams in the circumferential direction, with both the left and right sides folded in half.
The upper and lower ends of the cylindrical film (7) are sealed with linear heat seals having a width of 0.8 mm to 2.2 mm,
In a packaging bag with a tear notch, the bag body (2) is endowed with a straight tear property that allows the bag body (2) to tear straight in a direction perpendicular to the up-down direction when the bag body (2) is opened by tearing the bag body (2) from the tear notch (5) toward the other side edge (4) of the left and right side edges (3, 4) of the bag body (2),
A tear-stop slit (6) intersecting an imaginary tear line (L) extending straight from the opening notch (5) toward the other side edge (4) is formed at a position spaced apart from the other side edge (4) of the bag body (2) to one side so as not to overlap the other side edge (4) of the bag body (2);
The tear-stop slit (6) is formed in a curved arc shape so as to gradually move away from the other side edge (4) of the bag body (2) upward and downward from the position where it intersects with the intended tear line (L),
The bag body (2) is formed with a stopper-enclosing seal portion (13) that separates the storage space (1) from the tear-stop slit (6) so that the contents in the storage space (1) do not spill out through the tear-stop slit (6),
The stopper-enclosing seal portion (13) is a linear heat-sealed portion having a width of 0.8 mm to 2.2 mm, extending so as to surround the tear-stop slit (6),
The stopper-enclosing seal portion (13) extends vertically, intersecting the intended tear line (L) between the opening notch (5) and the tear-stop slit (6), and is formed so that the upper end of the stopper-enclosing seal portion (13) connects to the other side edge (4) of the bag body (2) above the intended tear line (L), and the lower end of the stopper-enclosing seal portion (13) connects to the other side edge (4) of the bag body (2) below the intended tear line (L) . The cylindrical film (7) is composed of a front film (10) located on the front side and a back film (11) located on the back side, with the folded portions on both the left and right sides as boundaries.
The stopper-enclosing seal portion (13) is formed so as to avoid the position of the tear-stop slit (6) so that the front film (10) and the back film (11) are not adhered to each other at the position of the tear-stop slit (6),
2. The inflation bag with tear-stop function according to claim 1 , wherein the tear-stop slit (6) is formed through the front film (10) and the back film (11), which are not bonded to each other. 3. The inflation bag with tear stop function according to claim 2, wherein the tubular film (7) is formed from a multi-layer inflation film consisting of an outer layer primarily composed of polyethylene, an intermediate layer primarily composed of a cyclic olefin resin and polyethylene, and an inner layer primarily composed of polyethylene . 4. An inflation bag with a tear stop function according to claim 1, wherein the stopper-enclosing seal portion (13) is formed in an arc shape with a central angle of 130° or less, with the other side edge (4) of the bag body (2) as the chord of the arc.