JP7222186B2 - pillow packaging bag - Google Patents

Description

The present invention is a packaging bag for packaging a product having a certain shape, such as a press through pack (hereinafter abbreviated as PTP packaging) for confectionery, stationery, pharmaceuticals, especially tablets and capsules, To provide a pillow packaging bag which can be easily opened and the contents of which can be taken out.

A pillow packaging bag made of laminated material, mainly plastic film, is used for packaging products with a certain shape. It is a packaging bag. It can be produced from a single roll of film, can be produced with an inexpensive filling machine, has high productivity, and is used as a packaging form that can be efficiently packed.

This pillow packaging bag is usually opened along the side of the back seal by grasping one end of the top seal portion or the bottom seal portion, but opening requires a large force. Even if an easy-opening starting point such as a notch or notch is simply attached to the end, it is difficult to open. There were problems such as bending and partially opening and making it difficult to take out, and conversely, opening too large.

To solve this problem, there was a method of making it easier to open the package. For example, in Patent Document 1, in a bottom-sealed gusset bag having a backing, an opening notch is provided between the backing and the deepest part of the side surface in sealing portions at both ends of the packaging bag, and A packaging bag characterized by providing an unsealing auxiliary line parallel to the back seal on the front surface and the back surface located between the boundary between the front surface and the back surface and the side surface and the notch for opening. is suggesting.

However, in such a pillow packaging bag having gussets on the left and right sides, cracks are likely to occur at the boundary between the storage portion and the sealing portion in the opening assistance line connecting the opening notches at the upper and lower ends, and particularly high barrier properties are required. There was a problem as a packaging bag used for the contents to be packed.

JP 2014-61942 A

Accordingly, it is an object of the present invention to obtain a packaging bag which is torn open by tearing from the end portion of the seal portion and in which the barrier layer is less likely to crack and which is easy to open.

The pillow packaging bag of the present invention is a pillow packaging bag having a back seal,
An opening auxiliary line is provided parallel to the back seal part of the pillow package,
A front surface that is inclined from the upper end of the front surface pushed forward by the contents and connected to the top seal part, and a rear surface that is inclined from the upper end of the back surface pushed out to the rear by the contents and connected to the top seal part. is formed and
A front bottom surface that is inclined from the lower end of the front surface and connected to the bottom seal portion and a rear bottom surface that is inclined from the lower end of the back surface and connected to the bottom seal portion are formed,
The opening assistance line does not exist in the seal portion, and the starting point of the opening assistance line is formed at any one of the front top surface, the rear top surface, the front bottom surface, and the rear bottom surface,
The starting point of the opening assist line is not formed on the front surface and the back surface pushed forward by the contents,
The pillow packaging bag is a pillow packaging bag having gussets on the left and right sides, and the pillow packaging bag is characterized in that the opening assistance line is provided only between the deepest part where the gusset is wrapped and the back paste. .

The pillow packaging bag of the present invention does not easily cause cracks in the barrier layer, does not open in an incomplete state due to deviation of the opening line, and provides an opening for taking out contents smoothly and easily. be able to.

It is a perspective view in the example of 1st Embodiment of the pillow packaging bag which concerns on this invention, and is the figure seen from the front surface side, and the figure seen from the back surface side. It is a perspective view showing a state in which the pillow packaging bag of the first embodiment of the present invention is opened, and a diagram showing an example of an opening assistance line. It is the perspective view which shows the pillow packaging bag of the 2nd Embodiment based on this invention, and sectional drawing of the longitudinal direction and a horizontal direction.

An embodiment of the pillow packaging bag of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the first embodiment of the pillow packaging bag 1 according to the present invention containing the contents, FIG. 1-1 is a view from the front side, and FIG. 1-2 is the back side It is the figure seen from.
When the pillow packaging bag 1 contains contents having a certain shape, the central surface swells, and as shown in FIG. A front top surface 22 is formed between the portion 4 and the front surface 21 , and a front bottom surface 23 is formed between the bottom seal portion 5 and the front surface 21 .
Similarly, on the back side, as shown in FIG. A rear bottom surface 33 is formed between.
In particular, on the back side, a back seal 6 is formed in the center from the top seal portion 4 to the bottom seal portion 5 .

Here, as shown in FIG. 1-1, on the front side, the starting point 71 is placed on the front top surface 22 between the top seal portion 4 and the upper end of the front surface 21 pushed forward by the contents. An end point is provided on the front bottom surface 23 between the lower end of the surface 21 and the bottom seal portion 5, and an opening assistance line 7 parallel to the back seal 6 is provided between the starting point 71 and the end point.
Further, as shown in FIG. 1-2, on the rear surface side, a starting point 71 is provided on the rear top surface 32 between the upper end of the back surface 31 pushed rearward by the contents and the top seal portion 4, and the lower end of the back surface 31 and the bottom seal are attached. An end point is provided on the rear bottom surface 33 between the portion 5 and an unsealing assistance line 7 parallel to the back seal 6 is provided between the starting point 71 and the end point. The starting point is the front top surface 22 and the rear top surface 32 side, and the end point is the front bottom surface 23 and the rear bottom surface 33 side. Further, the unsealing assistance line 7 may be provided on at least one of the front surface side and the back surface side, but if it is provided on both the front surface side and the back surface side, the unsealability is further improved.

As a processing method of the opening assistance line 7, a method of pressing a metal blade directly against the film, or a method of processing using a laser machine such as a carbon dioxide laser, a YAG laser, an excimer laser having a continuous or pulse oscillation type. are mentioned. In the case of the method using a metal blade, printing and simultaneous processing are desirable, and in the case of the method using a laser, it is desirable to introduce at the time of slitting.

The processing depth of the opening assistance line 7 is basically within the thickness of the outer layer film, but it is processed to be 30% or more and less than 90%, preferably 40% to 70% of the total thickness of the laminate. .
The processing shape of the opening assistance line 7 may be an I-shaped perforated line that is an intermittent continuous line so that it can be easily cut straight regardless of whether the deflection at the time of tearing goes to the left or right. , and other arbitrary shapes such as V-shape, U-shape, and V-shape can be used. In particular, a V shape or a V shape is preferable.

Although there are no particular restrictions on the line width or the number of the opening assisting lines 7, it is preferable to use two or more lines so that the package can be reliably opened.
By clearly defining the position of the auxiliary opening line 7, the contents are torn linearly along the auxiliary opening line 7 or hit the contents and are torn while moving to the auxiliary opening line 7 on the outside.

An opening notch 41 is provided at the end of the top seal portion 4 or the end of the bottom seal portion 5 on the extension line of the unsealing assistance line 7 .
As for the shape of the opening assistance line 7, as shown in FIG. 2-2, a V-shape, a V-shape, a U-shape, or a shape opposite to the V-shape can be used.
In the case of a square shape, a shape opposite to the square shape, a square shape, and a square shape, the notch 41 for opening is processed on both the upper side and the lower side. Although it is good, it is possible to clarify the opening possible starting point by processing only one side.
The shape of the notch 41 for opening may be V-shaped, L-shaped, or an I-shaped notch. In addition, when the unsealing assist line 7 is not a directional opening such as a V-shape, a V-shape, or a N-shape, the opening notch 41 of the top seal portion 4 and the bottom seal portion 5 are also unsealed. should be provided.

FIG. 2-1 is a perspective view showing a state in which the pillow packaging bag 1 of the first embodiment according to the present invention is opened.
To open the pillow packaging bag 1 of the first embodiment, grasp the left and right sides of the notch 41 for opening and tear it, and when the tear reaches the starting point 71 of the opening auxiliary line 7, breakage starts one after another, It tears until it reaches the bottom seal.
In this way, in the figure, the left side portion is separated from the other portion of the pillow packaging bag 1, and a longitudinally opened fractured surface appears, and the contents 9 can be easily opened.

FIG. 3 shows a second embodiment of the present invention, which is a pillow packaging bag having gussets 8 on the left and right sides. 3-1 is a perspective view showing its appearance, FIG. 3-2 is a cross-sectional view in the horizontal direction, and FIG. 3-3 is a cross-sectional view in the vertical direction.
By providing the notch 41 for opening between the back seal part 6 of the upper end seal part of the packaging bag and the deepest part 81 of the gusset, the place where opening is started is the part where the two laminated bodies are overlapped. It is possible to provide a packaging bag that is easy to open because not only can it be opened with a small force, but also it is possible to secure a large gripping area when opening.
In the second embodiment, the notch 41 for opening can be used as a trigger to completely remove the gusset 8 on the side, so that it is possible to provide a wide opening for easy removal of the contents.
In the case of such a pillow packaging bag having left and right gussets, an opening auxiliary line 7 is provided between the deepest part 81 where the gussets 8 are wrapped and the back seal part 6 on the back side.
In addition, a plurality of opening notches 41 may be provided not only on the extension line of the opening assistance line 7 but also on the periphery thereof.

The laminate constituting the pillow packaging bag of the present invention is composed of a substrate layer, metal foil, and heat-sealing resin from the outside.
Examples of the substrate layer include polyethylene terephthalate film, polypropylene film, polystyrene film, polyamide film, etc. Among them, polyethylene terephthalate film is particularly preferable. Also, these films may be provided with an aluminum vapor deposition layer or a metal oxide vapor deposition layer such as silicon oxide.

Moreover, a printed layer can be appropriately provided on the base material layer as needed. The printed layer is a layer printed with an ink obtained by adding various pigments, extender pigments, plasticizers, desiccants, stabilizers, and the like to binder resins such as urethane, acrylic, nitrocellulose, and rubber. As the printing method, for example, known printing methods such as offset printing, gravure printing, flexographic printing, silk screen printing, and inkjet printing can be used. Further, the adhesion of the printed layer can be improved by subjecting the surface of the substrate layer to corona treatment or ozone treatment in advance as a pretreatment.

As the metal foil, for example, aluminum foil, copper foil, tin foil, lead foil, brass foil, gold foil, silver foil, etc. can be used, but aluminum foil is particularly preferable in terms of processability, price, and mass productivity. Moreover, in order to laminate metal foils, they can be bonded together by a dry lamination method via an adhesive layer.
The metal foil not only has a high barrier property against water vapor and the like, but also has a high tear property.

Examples of heat-sealable resins include linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, ethylene- Polyolefin resins such as methyl methacrylic acid copolymers, ethylene/methyl acrylate acid copolymers, ethylene/ethyl acrylate acid copolymers, ethylene/butyl acrylate acid copolymers, and ionomer resins can be used. These resins can be formed into a film by a T-die or an extruder such as an inflation machine. It may be a single layer or multiple layers. The thickness of the film is preferably in the range of 30-100 μm.

An adhesive for dry lamination can be used as the adhesive layer. For example, a two-component curing urethane adhesive, a polyester urethane adhesive, a polyether urethane adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, an epoxy adhesive, and the like can be used. . As a lamination method, a dry lamination method can be used, but lamination may be performed while forming a film on the sealant layer side using an extruder lamination machine, or sand polyethylene processing may be performed.

<Example 1>
As the laminated film, a laminated film consisting of polyethylene terephthalate film (12 μm)/printing layer/sanded polyethylene resin layer (12 μm)/aluminum foil (9 μm)/adhesive layer/linear low-density polyethylene resin layer (40 μm) from the outside is used. bottom.
The left and right sides were folded inward to form a gusset, a back seal portion 6 was provided in the center of the back surface, and 6 sheets of PTP packaging were placed as contents to prepare a pillow packaging bag having the shape shown in FIG.
At this time, the starting point of the opening assistance line is set to the front surface (area b shown in Figure 3-3) on the front side, and to the rear surface (area d shown in Figure 3-3) on the back side. was made to fall within the range of
The end point of the opening assistance line was the front bottom surface on the front side and the rear bottom surface on the back side.

<Example 2>
The starting point of the unsealing assistance line was the front surface (area b shown in FIG. 3-3) for the front surface, and the rear surface (area e shown in FIG. 3-3) for the back surface. The end point of the opening assistance line, the configuration, shape, contents, etc. of the laminated film were prepared in the same pillow packaging bag as in Example 1.

<Example 3>
The starting point of the opening assistance line was set at the position of the front surface (area a shown in FIG. 3-3) on the front surface, and on the rear surface (area d shown in FIG. 3-3) on the back surface. The end point of the opening assistance line, the configuration, shape, contents, etc. of the laminated film were prepared in the same pillow packaging bag as in Example 1.

<Comparative Example 1>
The starting point of the opening assistance line was set at the front surface (range b shown in FIG. 3-3) on the front surface, and at the position of the top seal portion (range c shown in FIG. 3-3) on the back surface. The end point of the opening assistance line, the configuration, shape, contents, etc. of the laminated film were prepared in the same pillow packaging bag as in Example 1.

<Comparative Example 2>
The starting point of the opening assistance line is the position of the top seal part on the front side (area c shown in Figure 3-3), and the position of the top seal part on the back side (area c shown in Figure 3-3). . The end point of the opening assistance line, the configuration, shape, contents, etc. of the laminated film were prepared in the same pillow packaging bag as in Example 1.

<Comparative Example 3>
The starting point of the opening assistance line was the position of the top seal portion on the front surface (area c shown in FIG. 3-3), and the rear surface on the back surface (area d shown in FIG. 3-3).
In addition, the end point of the opening assistance line, the configuration and shape of the laminated film, the contents, etc. were formed in the same pillow packaging bag as in Example 1.

<Comparative Example 4>
The starting point of the opening assistance line was the position of the top seal portion (area c shown in FIG. 3-3) on the front surface, and the back surface (area e shown in FIG. 3-3) on the back surface.
The end point of the opening assistance line, the configuration, shape, contents, etc. of the laminated film were prepared in the same pillow packaging bag as in Example 1.

<Comparative Example 5>
The starting point of the unsealing assistance line was the position of the front surface (area a shown in FIG. 3-3) on the front surface, and the back surface (area e shown in FIG. 3-3) on the back surface.
The end point of the opening assistance line, the configuration, shape, contents, etc. of the laminated film were prepared in the same pillow packaging bag as in Example 1.

<Comparative Example 6>
The starting point of the opening assistance line is the position of the front surface (range a shown in Figure 3-3) on the front side, and the position of the top seal part (range c shown in Figure 3-3) on the back side. bottom.
The end point of the opening assistance line, the configuration, shape, contents, etc. of the laminated film were prepared in the same pillow packaging bag as in Example 1.

<Evaluation method>
Twenty pillow packaging bags were prepared for each, 10 bags were evaluated for openability, and the remaining 10 bags were evaluated for confirmation and evaluation of cracks in the metal foil.

<Method for evaluating side unsealability>
If 10 bags were opened by grasping the left and right sides of the notch and tearing them apart vertically from the top sealing part to the bottom sealing part, the number of bags that could be opened more than half was evaluated as ◎, and if 8 bags or more, it was evaluated as ○. When the number of bags was 6 or more and 7 or less, it was evaluated as Δ, and when it was 5 bags or less, it was evaluated as ×.

<Aluminum foil crack evaluation method>
The pillow packaging bag was immersed in water to a depth of 20 cm, and the outside of the pillow packaging bag was lightly pressed to confirm whether or not bubbles were generated from the opening assistance line or the like.

<Evaluation results>
In Examples 1 to 3, no problem occurred in both side unsealability and evaluation of aluminum foil cracks, and good results were obtained. Among them, the result of Example 1 was very good.
Regarding Comparative Examples 1 to 4 and Comparative Example 6, although the unsealability was good, there was a problem that cracks occurred in the aluminum foil and the barrier properties were remarkably lowered.
In Comparative Example 5, although cracks did not occur in the aluminum foil, the opening line collided with the contents before reaching the opening assistance line, so it diverted outward along the contents and was torn off in the middle. rice field.

From the above results, in order to prevent cracking of the metal foil and to ensure the opening, the starting point of the opening assistance line should be formed on at least one of the front surface on the front side and the rear surface on the back side. Similarly, when opening from the bottom side, the end point of the opening assistance line is either the front bottom surface on the front side or the rear bottom surface on the back side. It was inferred that it was necessary to form at least.

As described above, the pillow packaging bag of the present invention is a packaging bag that has a high barrier property and that can be opened widely according to the size of the contents. In addition, the packaging bag can be manufactured with only one roll of the laminated film, and the productivity is high, and the manufacturing is possible with low-cost packaging equipment.

1...... Pillow packaging bag 21... Front surface 22... Front top surface 23... Front bottom surface 31... Back surface 32 Rear surface 33 Rear bottom surface 4 Top seal portion 41 Notch (top seal portion)
5 Bottom seal portion 6 Back seal portion 7 Opening assistance line 71 Starting point (of the opening assistance line starting point)
8: Gusset portion 81: Deepest portion (deepest portion of gusset)
9 Contents

Claims (7)

In a pillow packaging bag having a back seal,
An opening auxiliary line is provided parallel to the back seal part of the pillow package,
A front surface that is inclined from the upper end of the front surface pushed forward by the contents and connected to the top seal part, and a rear surface that is inclined from the upper end of the back surface pushed out to the rear by the contents and connected to the top seal part. is formed and
A front bottom surface that is inclined from the lower end of the front surface and connected to the bottom seal portion and a rear bottom surface that is inclined from the lower end of the back surface and connected to the bottom seal portion are formed,
The opening assistance line does not exist in the seal portion, and the starting point of the opening assistance line is formed at any one of the front top surface, the rear top surface, the front bottom surface, and the rear bottom surface,
The starting point of the opening assist line is not formed on the front surface and the back surface pushed forward by the contents,
The pillow packaging bag is a pillow packaging bag having gussets on the left and right sides, wherein the opening assistance line is provided only between the deepest part where the gussets are wrapped and the spine. 2. The pillow packaging bag according to claim 1, wherein said opening assistance line comprises a plurality of opening assistance lines parallel to the back seal portion. A laminated body constituting a pillow packaging bag comprises at least a base material layer, a metal foil, and a heat-sealing resin, and the unsealing assistance line consists of an intermittent continuous line cut into the base material layer. 3. The pillow packaging bag according to 1 or 2. 4. The pillow packaging bag according to claim 3, wherein the laminate constituting the pillow packaging bag comprises polyethylene terephthalate as a base material layer. 5. The pillow packaging bag according to claim 3, wherein the laminate constituting the pillow packaging bag is made of aluminum foil as the metal foil. 6. The pillow packaging bag according to any one of claims 1 to 5, wherein the opening assistance line is composed of perforations that are intermittent continuous lines. The pillow packaging bag according to any one of claims 1 to 6, wherein the notch for opening is provided on an extension line of the opening assistance line at the end of the top seal portion and the end of the bottom seal portion.

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