JP6916144B2 - Packaging bag - Google Patents

Description

The present invention relates to a packaging bag provided with an opening start portion and an opening guidance portion for opening the sealed bag body.

Conventionally, an opening start portion such as a notch is provided in the seal portion at both the left and right measuring ends of the bag body composed of the front film and the back film, and in each of the front and back films, a straight line is provided as an opening guide line between the left and right opening start portions. A packaging bag in which a shape-shaped half-cut line is formed is known. In the packaging bag having the above configuration, the packaging bag can be easily opened along the opening guide line, triggered by the opening start portion.

However, when trying to widen the opening by manually picking the open ends of the front film and the back film, there is a problem that it is difficult to pick the open ends by hand if the cut surfaces of both films are at the same position. rice field. In particular, in a packaging bag in which a resealing portion such as a fastener is formed below the opening, there is almost no gap between the opening ends of both films, so that the opening end is more difficult to pinch. ..

As a packaging bag for solving the above problems, for example, in Patent Document 1, as an easy-opening means, an easy-opening processed portion provided on the outer edge of the left and right side seal portions and a surface having a convex shape provided on the surface laminate. A packaging bag including a half-cut line a, a front surface half-cut line b provided on the front surface laminate and having a downwardly convex shape, and a linear back surface half-cut line provided on the back surface laminate is disclosed.

In the above configuration, two half-cut lines are formed on the front surface laminate, and the cutting path in the front surface laminate draws a locus along one of the two half-cut lines, and the back surface laminate has two half-cut lines. By drawing a locus along a straight half-cut line, the cutting path creates a step in the vertical direction of the bag body between the open ends of the films on the front and back surfaces, and the open ends of each film can be easily picked by hand. You can do it.

Japanese Unexamined Patent Publication No. 2014-51310

However, in the above configuration, the half-cut lines of the surface laminate are two non-linear shapes, one having a convex shape upward and the other having a convex shape downward, and the cutting path is half as compared with the linear half-cut line. It is easy to deviate from the cut line. Once the cutting path deviates from the half-cut line, it is difficult to control the trajectory of the cutting path, and the packaging bag is not opened sufficiently, or conversely, the packaging bag is opened larger than planned. There has been a problem that it is difficult to open the package in a shape along a predetermined half-cut line.

Therefore, in the present invention, the packaging bag can be easily opened so as to have a predetermined shape (easy opening), and has excellent operability (opening operability) for manually widening the opening of the bag after opening. The purpose is to provide.

In order to solve the above problems, the packaging bag as one aspect of the present invention is a packaging bag formed by sealing the peripheral edge of a bag body composed of a front film and a back film, and is formed on the peripheral edge of the bag body. The opening start portion formed on each of the left and right side ends of the bag body among the seal portions, and the first opening guide portion formed between the left and right opening start portions in the film on one side of the front and back films. The film on the other side of the front and back films includes a second opening guide formed between the left and right opening start portions, and the first opening guide portion is a linearly formed first opening guide. The second opening guide has a wire, the second opening guide has a plurality of second opening guides formed in parallel, and the plurality of second opening guides have the first opening guide in an intermediate portion of the bag body. It is characterized in that it is formed at a position where it does not overlap with the wire in the vertical direction, and at least one of the plurality of second opening guide wires is connected to the left and right opening start portions.

The second opening guide portion includes at least three second opening guide wires, and among the three second opening guide wires, an intermediate second opening guide wire is located at the tip of the left and right opening start portions. It may be a connected configuration. Further, the second opening guide wire may be a curved line that bulges downward in the vertical direction of the bag body.

In addition to the first opening guide wire, the first opening guide portion further branches from both ends of the first opening guide wire and heads at least toward the seal portion on the closest side of the seal portions on both the left and right ends. It may have one opening auxiliary line, and the opening auxiliary line may be formed so as to pass above the first opening guide line in the vertical direction of the bag body.

Further, the opening auxiliary line may have a configuration in which a plurality of the opening auxiliary lines are formed so as to branch from each specific point at both ends of the first opening guide line.

According to the above aspect, a linear first opening guide line is formed on one side of the film, and a plurality of non-linear second opening guide lines are formed in parallel on the other side film. Even if the cutting path deviates from one second opening guide line, the trajectory of the cutting path can be controlled so as to follow the other second opening guide line. That is, it is possible to easily open the package while keeping the trajectory of the cutting path in the area surrounded by the plurality of second opening guide lines. As a result, it is possible to form a step in the vertical direction of the bag body between the cut surfaces of the pair of films, and it is possible to obtain a packaging bag having excellent opening operability.

Schematic front view showing the packaging bag of the first embodiment of the present invention. Schematic diagram of the back showing the packaging bag of the first embodiment of the present invention. Partially enlarged view of FIG. Partially enlarged view of FIG. Schematic front view showing the packaging bag of the second embodiment of the present invention. Partially enlarged view of FIG.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. 1 is a schematic front view showing the packaging bag according to the present embodiment, FIG. 2 is a schematic rear view of the packaging bag, FIG. 3 is a partially enlarged view of FIG. 1, and FIG. 4 is a partially enlarged view of FIG. show. In FIG. 1, the arrow X indicates the horizontal direction of the packaging bag, and the arrow Y indicates the vertical direction of the packaging bag. The left-right direction X and the up-down direction Y are for clarifying the relative positional relationship of each part in the packaging bag, and do not necessarily match the directions at the time of use.

The packaging bag of the present embodiment has a rectangular shape, and the front (one side) film 1 and the back (other side) film 2 are opposed to each other and overlapped with each other to seal the peripheral edge. As a result, the right seal portion 4 and the left seal portion 5 are formed on the left and right ends of the bag body 3 composed of the front and back films 1 and 2, and the upper seal portion 6 and the lower seal portion 7 are formed on the upper and lower ends of the bag body. The bag main body 3 may have a structure in which two films on the front and back faces each other and are overlapped with each other to seal the peripheral edge, or one film may be folded back to seal the peripheral edge.

The front film and the back films 1 and 2 used for the packaging bag preferably have at least a heat-sealing resin layer. This makes it possible to form the sealing portions 4 to 7 by heat fusion without using an adhesive. The composition of the film can be appropriately selected depending on the nature of the object to be contained. In the present embodiment, a laminated film in which a base material layer, a gas barrier layer, and a sealant layer are sequentially laminated from the outside of the bag is used.

As the base material layer, a polyethylene terephthalate film, a polypropylene film, a polyamide film or the like can be used. As the gas barrier layer, a metal vapor deposition layer such as aluminum may be formed on the surface of the base material layer, or a metal foil layer such as aluminum foil may be adhered and laminated on the surface of the base material layer. , A resin film having a gas barrier property can be used. As the sealant layer, a polyolefin resin such as polyethylene can be preferably used.

A resealing portion 8 is formed on the upper portion of the bag body 3 over the left and right sealing portions 4 and 5. The resealing portion 8 is composed of a fastener having a band-shaped protrusion formed on either one of the front film 1 and the back film 2 and a band-shaped groove formed on the other, but is limited to this. Instead, a known structure capable of opening and sealing, for example, an adhesive seal or the like can be appropriately used.

An opening start portion 9 and an opening guide portion 10 and 11 are formed between the resealing portion 8 and the upper sealing portion 6. As a result, the packaging bag can be opened at the upper end of the bag body along the opening start portion 9 and the opening guide portions 10 and 11. After opening, the packaging bag can be resealed and resealed by the resealing unit 8.

The opening start portion 9 is a portion that serves as a starting point for opening the packaging bag, and a U-shaped notch is formed in the present embodiment, but the present invention is not limited to this, and a V-shaped notch or a linear shape is formed. It is possible to adopt a notch portion of the above, a group of scars penetrating the seal portion, and the like. The opening start portion 9 is formed along the left-right direction from the outer edge to the inner edge of the left and right seal portions 4 and 5.

The opening guides are the first opening guide 10 formed between the left and right opening start portions 9 and 9 on the front film 1, and the first opening guide portion 10 formed between the left and right opening start portions 9 and 9 on the back film 2. (Ii) The opening guidance unit 11 is provided. The first opening guide portion 10 has a linearly formed first opening guide line 10a, and the second opening guide portion 11 has a plurality of second opening guide lines 11a formed in parallel. The plurality of second opening guide lines 11a are formed at a position in the middle portion of the bag body 3 so as not to overlap with the first opening guide line 10a in the vertical direction Y. At least one of the plurality of second opening guide lines 11a is connected to the left and right opening start portions 9 and 9.

The first opening guide wire 10a and the second opening guide wire 11a are formed as grooves having a certain depth (non-penetrating) from the film surface (so-called half-cut wire). As a result, the film strength of the portion where the first opening guide line 10a and the second opening guide line 11a are formed is lower than that of the other film portions. The packaging bag can be opened. The opening guide wires 10 and 11 can be formed by laser processing or by mechanical means such as a Thomson blade.

Because the second opening guide wire 11a is formed at a position that does not overlap in the vertical direction in the intermediate portion between the first opening guide wire 10a formed in a straight line and the bag body 3, that is, because it is formed in a non-linear shape. , The cutting path is more likely to deviate from the second opening guide line 11a as compared with the linear first opening guide line 10a.

Therefore, in the present invention, by forming a plurality of second opening guide lines 11a in parallel, even if the cutting path deviates from one second opening guide line 11a, it follows the other second opening guide line 11a. It is possible to control the trajectory of the cutting path. That is, it is possible to easily open the package while keeping the trajectory of the cutting path within the region surrounded by the plurality of second opening guide lines 11a. When the packaging bag of the present embodiment is opened, a step is formed in the vertical direction Y between the open ends of the front film 1 and the back film 2, and the open ends of the films 1 and 2 can be easily picked by hand. .. In particular, it is possible to obtain a packaging bag having excellent opening operability when resealing after resealing the packaging bag by the resealing unit 8.

Explaining the first opening guide line 10a and the second opening guide line 11a in more detail, as shown in FIG. 3, the first opening guide line 10a has both left and right ends of the left and right opening start portions 9, that is, that is, Of the U-shaped opening start portions 9, the seal portions 4 and 5 are formed so as to be connected to the portion closest to the inner edge.

Further, in the present embodiment, three second opening guide wires 11a are formed in parallel in the vertical direction of the bag body as curved lines that bulge downward in the vertical direction. The second opening guide line 11a can be formed as a curve that bulges upward in the vertical direction, but is formed as a curve that bulges downward in the vertical direction as in the present embodiment. However, it is preferable.

The reason is that when opening the packaging bag, the upper seal portion and the lower seal portion are picked by hand across the opening start portion 9, and one hand is on the front side and the other hand is on the back side. The package is opened by twisting, but the hand holding the upper side of the opening start portion 9 often twists slightly downward from the left-right direction X. Therefore, the opening force is likely to be applied diagonally downward from the opening start portion 9, and if the second opening guide line 11a is formed as a curved line that bulges downward in the vertical direction, the second opening guide line 11a can be easily applied along the second opening guide line 11a. It becomes possible to form a cutting path.

When the second opening guide wire is curved so as to bulge upward in the vertical direction, the second opening guide wire is placed between the virtual line connecting the left and right opening start portions 9 and 9 and the upper seal portion 6. Another reason for the above is that it becomes necessary to secure a space for forming the packaging bag, and there are many restrictions on the design of the packaging bag.

The three second opening guide lines 11a are formed so that both the left and right ends reach the tip of the opening start portion 9. Then, of the three second opening guide wires 11a, the left and right ends of the intermediate second opening guide wire 11a are formed so as to be connected to the tips of the left and right opening start portions 9, respectively. Of the three second opening guide lines 11a, the uppermost second opening guide line 11a is formed so that both the left and right ends are located above the opening start portion 9 (in the vertical direction Y).

With the above configuration, the cutting route of the packaging bag at the time of opening is transmitted from the opening start portion 9 to the first opening guide line 10a and the second opening guide line 11a, and smooth opening becomes possible. However, as the resin film constituting the base material layer or the resin film constituting the sealant layer, a resin film in which the resin is oriented in the film delivery direction at the time of producing the resin film may be used. In this case, by matching the left-right direction X of the front film 1 and the back film 2 with the film delivery direction of the resin film, the front film 1 and the back film 2 can be easily opened in the left-right direction X. There is.

However, when a resin film is manufactured while stretching the resin layer not only in the film feeding direction but also in the direction orthogonal to the film feeding direction such as T-die molding (biaxial stretching) and inflation molding, the resin orientation direction is resin. There is a possibility of tilting with respect to the feeding direction of the film. Moreover, the degree of inclination of the resin orientation direction with respect to the resin film delivery direction changes depending on the position of the resin film. Therefore, when the film delivery direction of the resin film of the base material layer or the sealant layer is aligned with the left-right direction X of the front film 1 and the back film 2, the orientation direction of the resin may be inclined from the left-right direction X. be.

When the orientation direction of the resin used in the front film 1 is inclined from the left-right direction X, the first opening guide line 10a is formed straight from the opening start portion 9 along the left-right direction X, and thus the resin. The angle between the orientation direction of the first opening guide line 10a and the first opening guide line 10a is not so large, and the cutting path is unlikely to deviate from the first opening guide line 10a.

On the other hand, when the orientation direction of the resin used in the back film 2 is inclined in the direction indicated by the arrow A in FIG. 4, for example, the second opening guide line 11a is originally inclined downward. Therefore, the angle between the resin orientation direction and the second opening guide line 11a becomes large, and the cutting path tends to deviate from the resin orientation direction A.

In the present embodiment, of the three second opening guide lines 11a, the uppermost second opening guide line 11a is formed so that both the left and right ends are located above the opening start portion 9 (in the vertical direction Y). Therefore, even in the above case, the cutting path deviating from the orientation direction A of the resin comes into contact with the second opening guide line 11a at the upper end of the three, and thereafter, the second opening guide line. The packaging bag can be easily opened by drawing a trajectory along 11a.

[Second Embodiment]
The present embodiment is characterized in that an opening auxiliary line is provided in addition to the first opening guide line as the first opening guide portion, and other configurations are the same as those of the first embodiment. FIG. 5 shows a schematic front view showing the packaging bag according to the present embodiment, and FIG. 6 shows a partially enlarged view of FIG.

As shown in FIG. 5, in addition to the first opening guide wire 10a, the first opening guide portion 10 is further connected from both ends of the first opening guide wire 10a (inside the bag body than the left and right seal portions 4 and 5). It has at least one opening auxiliary line 10b that branches toward the seal portion 4 or 5 on the closer side of the left and right seal portions 4 and 5, respectively. The opening auxiliary line 10b is formed so as to pass above the first opening guide line 10a in the vertical direction Y.

More specifically, the opening auxiliary lines 10b are four linear lines so as to branch from each specific point at both ends of the first opening guide line 10a (inside the bag body than the left and right sealing portions 4 and 5). Is formed. The other end of the opening auxiliary line 10b is preferably formed so as to cover the seal portion 4 or 5, and more preferably formed up to the outer edge of the seal portion 4 or 5. The opening auxiliary line 10b is formed as a half-cut line like the first opening guide line 10a and the second opening guide line 11a described in the first embodiment.

As described in the first embodiment, the orientation direction of the resin used in the front and back films 1 and 2 used for the packaging bag may be the direction inclined from the left-right direction X. Even in such a case, it is unlikely that the cutting route deviates from the first opening guide line 10a under normal circumstances, but the cutting route may be the first opening guide line depending on the opening method (such as how to tear the packaging bag). There is a risk of deviation from 10a.

Even in such a case, if the opening auxiliary line 10b is formed as in the present embodiment, the deviated cutting path comes into contact with the opening auxiliary line 10b and then first along the opening auxiliary line 10b. It is possible to return to the opening guide line 10a.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the first embodiment, the second opening guide line is formed as a curved line that bulges downward in the vertical direction, but the present invention is not limited to this, and the straight line may be formed as a bent curved line. ..

Further, in the second embodiment, the opening auxiliary line is formed so as to branch from a specific point of the first opening guide line, but the present invention is not limited to this, and the opening auxiliary line may branch from a different point of the first opening guide line. May be formed in. Further, in the above embodiment, the front film and the back film have a three-layer laminated structure, but the present invention is not limited to this, and for example, a surface resin layer or a printing layer may be formed on the surface side of the base material.

1 Front (one side) film 2 Back (other side) film 3 Bag body 4 Right seal part 5 Left seal part 6 Upper seal part 7 Lower seal part 8 Reseal part 9 Opening start part 10 First opening guide part 10a No. 1 Opening guide line 10b Opening auxiliary line 11 Second opening guide 11a Second opening guide line

Claims (4)

A packaging bag made of a front film and a back film that seals the periphery of the bag body, and is opened by sealing portions on the left and right sides of the bag body among the sealing portions formed on the periphery of the bag body. Between the start portion, the first opening guide portion formed between the left and right opening start portions in the film on one side of the front and back films, and between the left and right opening start portions in the film on the other side of the front and back films. The opening start portion includes a notch or a notch portion, and the first opening guide portion has a linearly formed first opening guide line. the second opening guiding part has at least three second opening guide wire vertically above or in parallel formed to bulge only on either one side of the lower bag body, the said three two opening guiding line is formed at a position not overlapping in the vertical direction as the first opening guide wire at an intermediate portion of the bag body, a second opening guide wire intermediate of said three second opening guide wire, A packaging bag characterized in that it is connected to the tip ends of the left and right opening start portions at a position where the first opening guide wire overlaps in the vertical direction. The packaging bag according to claim 1 , wherein the second opening guide wire is a curved line that bulges downward in the vertical direction of the bag body. In addition to the first opening guide line, the first opening guide portion is further branched from the first opening guide line inside the bag body than the seal portions at the left and right side ends of the bag body, and the left and right sides are branched. It has at least one opening auxiliary line toward the seal part on the closest side of the sealing parts at the ends, and the opening auxiliary line passes through the upper side of the bag body in the vertical direction with respect to the first opening guide line. The packaging bag according to claim 1 or 2 , wherein the packaging bag is formed. The packaging bag according to claim 3 , wherein a plurality of opening auxiliary lines are formed so as to branch from a specific point at both ends of the first opening guide line.

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