JP2016117525A - Gusset packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gusset packaging bag, which can be opened with a neat open shape with desired size, at an optional portion of an upper face, and which can be used as a container after opening.SOLUTION: A gusset packaging bag comprises: a bottom face film 10a; a pair of facing side face films 10b, 10c coupled to both end edges of the bottom face film respectively, and on which a folding is formed respectively; and an upper face film 10d coupled to upper end edges of the side face films, in which an almost center part is a hutt seam type, and a back seal part 13 is provided, in which the gusset packaging bag is formed into a cylindrical body whose both ends are opened, one opening 10e is sealed in advance, the other opening 10f is sealed after filling a packed object in the gusset packaging bag. The upper face film 10d has open cut lines 11 on both end edges, and is heat deposited to end edges of the side face films, and the back seal part comprises a tear cut line 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gusset packaging bag, and more particularly to a gusset packaging bag that is easy to open and can be used as a container after the opening without transferring the packaged item to another.

  In recent years, microwave ovens have rapidly developed and become popular, and are now one of the necessities in ordinary households. Along with this spread, a wide variety of processed foods for microwave ovens have been developed and commercialized, and are distributed and sold in large quantities in the market. Most of these processed foods are packed in packaging bags of a predetermined shape, and these packaging bags are devised to suit each processed food.

  For example, Patent Document 1 below describes two different types of packaging bags. One packaging bag consists of a rectangular film in which a base material layer, an intermediate layer, and a sealant layer are laminated. It is equipped with an end seal part that seals the open end, and a cut is made in the direction perpendicular to the length direction of the back seal part near the upper end part of the back seal part, and also near the left and right end parts on the back of the bag Further, a half cut line extending in parallel with the back seal portion is provided. According to this packaging bag, after tearing the bag body from the back seal part in the left-right direction, the bag body is torn longitudinally along the half-cut line and can be used as a tray after opening.

The other packaging bag is provided with a half cut line extending in a direction perpendicular to the length direction of the back seal portion and across the back seal portion in the vicinity of both upper and lower end portions on the back surface of the bag. This packaging bag can also be used as a tray after tearing the bag body in the left-right direction along the half-cut line from the back seal part.
Further, Patent Document 2 described below describes a packaging bag that can easily hold a surface sheet when the gusset packaging bag is opened, and can be smoothly opened without dispersing force.

JP 2008-081191 A JP 2014-069883 A

  Of the two packaging bags described in Patent Document 1, one of the packaging bags requires a strong tearing force when tearing left and right. There is a risk of things jumping out. For this reason, if the package contains liquid, the liquid will flow out and contaminate the surroundings. If the package is heated in a microwave oven, there is a risk of being burned by hot water. is there. In addition, it is difficult to open along the assumed half-cut line even if the back seal part is torn to the left and right, and it becomes easy to form a random opening. Therefore, when using as a tray, the opening edge is There are problems such as being straight and not being torn cleanly and having an unpleasant shape, poor appearance and lack of design.

On the other hand, the other packaging bag has a half cut line formed near both ends of the bag, so that it does not seem to be torn to the edges of both ends like the above packaging bag. However, as a result of the experiment, it is similarly difficult to open along the half cut line, and if it is torn to the left and right, it will be torn to both edges of the bag body beyond the half cut line. There is. In addition, since the half-cut line is provided on the film surface that wraps the packaged item, the mechanical strength of this part is reduced compared to other parts, and the bag body is torn during transportation or heating in the microwave. The packaged items may jump out.
In addition, since these two packaging bags are both shallow, if the bag body is torn, the packaged items will jump out to the outside, especially when used in a microwave oven, there is a risk that hot water will be scattered and burned. is there.
Further, the packaging bag described in Patent Document 2 is of a gusset type and can be opened smoothly, but cannot be opened in any size and cannot be used in a microwave oven.

  The present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to open a desired size and a clean opening shape from an arbitrary position on the upper surface. An object of the present invention is to provide a gusset-type packaging bag that can be used as a container without transferring the package to others.

  Another object of the present invention is to provide a safe and secure gusset packaging bag that does not rupture even if the object to be packaged is heated as it is in a microwave oven.

  Another object of the present invention is to provide a gusset packaging bag with excellent productivity that can be manufactured easily and inexpensively by an automatic packaging machine.

  In order to solve the above-mentioned problem, a gusset packaging bag according to the first aspect of the present invention comprises a bottom film, a pair of opposing side films connected to both ends of the bottom film and folded, and the both side films. A cylindrical body with both ends opened is formed with a top film that is connected to the upper end edge and is bonded to the center of the top and provided with a back seal part. One end opening is pre-sealed and the other end opening is packaged. The upper film is thermally welded to the edge of the side film with opening cut lines at both end edges, and the back seal portion. Is provided with a tearing cut line.

  The gusset packaging bag according to the second aspect is the gusset packaging bag according to the first aspect, wherein the opening cut line includes a groove in which the upper surface film surface is half-cut, a plurality of through holes or non-through holes, and a hole in which these are mixed. Are formed by either through or non-through holes arranged in a line at predetermined intervals.

  A gusset packaging bag according to a third aspect is characterized in that, in the gusset packaging bag according to the first aspect, the opening cut line is formed by a recessed groove having a predetermined width, length and depth.

  A gusset packaging bag according to a fourth aspect is the gusset packaging bag according to any one of the first to third aspects, wherein the tear cut line includes a plurality of notches perpendicular to the longitudinal direction of the back seal portion. It is formed at a predetermined interval from one end in the longitudinal direction to the other end.

  A gusset packaging bag according to a fifth aspect is the gusset packaging bag according to any one of the first to third aspects, wherein the tear-off line is in the back seal portion and is formed on one joining surface of the top film. It is characterized by being formed of a recessed groove having a predetermined width, length and depth.

  A gusset packaging bag according to a sixth aspect is the gusset packaging bag according to any one of the first to fifth aspects, wherein the bag body is made of a single plastic film.

  A gusset packaging bag according to a seventh aspect is the gusset packaging bag according to the sixth aspect, wherein the plastic film is a laminated film in which at least a base material layer and an easily peelable sealant layer are laminated.

  The gusset packaging bag of the eighth aspect is the gusset packaging bag of the seventh aspect, characterized in that the heat-sealing seal of the opening is welded with higher strength than the heat-sealing of other portions.

  According to the gusset packaging bag of the first aspect of the present invention, it can be opened with a beautiful opening shape from any location on the top surface to a desired size. In other words, when the back seal part is torn by the tear cut line, the top film is torn toward both edges, the leading edge reaches the open cut lines at both ends, and the tear direction is perpendicular to the back seal part. It changes to parallel direction and is torn along the opening cut lines at both ends. Since this opening is opened from any part of the back seal part along the opening cut line through the top film, it can be opened to a desired size with a clean opening shape, and the opening piece can be opened from the top film. Can also be excised. In addition, after opening, the package is opened with a desired size and a beautiful opening shape, so that the packaged item does not pop out to the outside without changing the packaged item. It can be used as a deep bottom container.

  According to the gusset packaging bag of the second aspect, the opening cut line is linearly formed with a groove formed by half-cutting the upper surface film surface, a plurality of through holes or non-through holes, and a hole obtained by mixing them with predetermined intervals. By making the through or non-through holes arranged, opening can be performed with a beautiful opening shape along these cut lines. Further, these non-through holes or through holes are not deteriorated in mechanical strength even if a film provided with holes is sealed by being bonded and thermally welded to other films. As a result, the packaging bag is safe and hygienic because there is no invasion of bacteria from the outside through the opening cut line during distribution and storage, and there is no tearing or rupture of the bag during transportation. It will be excellent.

  According to the gusset packaging bag of the third aspect, since the opening cut line is formed by a recessed groove having a predetermined width, length, and depth, even if the internal pressure of the bag body increases during microwave heating. , It can be used safely and safely for microwave ovens without being expelled from being released from the recessed groove. In addition, after heating in a microwave oven, it can be opened to any size and with a clean opening shape, and there is no risk of contaminating the surroundings or burning the hand when opening, and after opening the packaged item Can be used with containers without having to be transferred to another.

  According to the fourth gusset packaging bag, the back seal portion can be easily torn from the notch of the tear cut line.

  According to the gusset packaging bag of the fifth aspect, even when the internal pressure of the bag body rises when heating the microwave oven, it is not released from the recessed groove and ruptures, and can be used safely and safely for a microwave oven. .

  According to the gusset packaging bag of the sixth aspect, a packaging bag can be easily produced by an automatic packaging machine.

  According to the gusset packaging bag of the seventh aspect, peeling at the opening cut line and the tearing cut line becomes smooth.

  According to the gusset packaging bag of the eighth aspect, the sealing strength of the opening at both ends of the cylindrical body is high by welding the heat-sealing seal of the opening with higher strength than the heat-sealing of other portions. The package is not released to the outside. On the other hand, the heat welded part and the back seal part at other places and the bent part are easily separated from the film at the time of opening, so that the opening becomes easy.

It is a perspective view of the gusset packaging bag which concerns on Embodiment 1 of this invention. 2A is a cross-sectional view taken along the line IIA-IIA in FIG. 1, and FIG. 2B is an enlarged view of the IIB portion in FIG. 2A. It is a top view of the plastic packaging material which forms a bag of the gusset packaging bag of FIG. 4A is an enlarged view of the IVA portion of FIG. 3, FIG. 4B is a cross-sectional view taken along line IVB-IVB of FIG. 4A, and FIG. 4C is a cross-sectional view showing a modification of FIG. 5A is an enlarged view of a VA portion in FIG. 3, FIG. 5B is a cross-sectional view taken along line VB-VB in FIG. 5A, and FIG. 5C is a cross-sectional view showing a modification of FIG. FIG. 6 shows the unsealed state of the unsealing cut line when the microwave oven is used, FIG. 6A is before unsealing, FIG. 6B is in the middle of unsealing, and FIG. 7 shows the opened state of the gusset packaging bag of FIG. 1, FIG. 7A is a perspective view before opening, and FIG. 7B is a perspective view after opening. It is a perspective view of the gusset packaging bag which concerns on Embodiment 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment shown below exemplifies a gusset packaging bag for embodying the technical idea of the present invention, and is not intended to specify the present invention. It is equally applicable to those of other embodiments included in.

[Embodiment 1]
With reference to FIG. 1 and FIG. 2, the gusset packaging bag which concerns on Embodiment 1 of this invention is demonstrated. 1 is a perspective view of the gusset packaging bag according to Embodiment 1 of the present invention, FIG. 2A is a cross-sectional view taken along the line IIA-IIA in FIG. 1, and FIG. 2B is an enlarged view of the IIB portion in FIG.

A gusset packaging bag (hereinafter also simply referred to as a “packaging bag”) 10 according to Embodiment 1 of the present invention is connected to a bottom film 10a and both end edges of the bottom film as shown in FIGS. A pair of opposing side films 10b, 10c with a top and a top film piece 10d provided with a back seal part 13 connected to the upper end edges of these side films and having a substantially central portion bonded together, and both ends are open. A first opening 10e is sealed in advance, and the other opening 10f is formed of a bag body that is sealed after the article to be packaged is loaded and wraps the article to be packaged (not shown). Is provided with opening cut lines 11 at both end edges, heat welded to the end edges of both side films 10b, 10c, and a tear cut line 12 (see FIG. 3) on the back seal portion 13. You have me. The upper surface film piece 10d is composed of a pair of upper surface film pieces 10d ₁ and 10d ₂ , and the portion where one opening 10e is sealed is the end seal portion 14, and the other opening 10f is sealed and the portion is an end portion. The seal portion 15 is formed.

  Hereinafter, the individual films of the bottom film, the side film, and the top film constituting the packaging bag will be described in detail.

  First, as shown in FIGS. 1 and 2, the bottom film 10a is made of a substantially rectangular film having a predetermined length and a predetermined length, and both end edges in the longitudinal direction are side films 10b and 10c, respectively. It is heat welded to the edge of the. This thermal welding is performed as welded portions 10ab and 10ac which are thermally welded by joining the both end edges of the bottom film 10a and the side films 10b and 10c with a predetermined width. These welded portions are located on the outer periphery of the bottom film 10a and function as a kind of frame for expanding the bottom film 10a. That is, when the packaging bag is placed on a flat surface, the bottom film 10a can be placed in a state in which these welds spread and function stably as a frame, and the box-like film is placed in the packaging bag. When the tray is inserted, the tray can be positioned and fixed by these welds.

As shown in FIGS. 1 and 2, the pair of side films 10b and 10c are made of a substantially rectangular film having a predetermined length and width and having a predetermined size, and extend along the longitudinal direction at a substantially central portion in the longitudinal direction. Folded portions (bent portions are referred to as gussets) 10b 'and 10c', which are folded into a substantially V shape with a predetermined width, are provided with upper end film pieces 10d ₁ and 10d _{2 at} their longitudinal edges. And heat welded.

As shown in FIGS. 1 and 2, the upper surface film piece 10d is composed of two substantially rectangular upper surface film pieces 10d ₁ and 10d ₂ having a predetermined size and a predetermined length. The pieces are heat-welded with one end edge in the longitudinal direction having a predetermined width. This joint heat welded portion becomes the back seal portion 13, which is provided with a tear cut line 12. This cut line will be described later. Each top film pieces _10d 1, respectively of the edge opening cut line 11 of 10d ₂ (FIG. 2B see) is provided with both side film 10b, is thermally welded to the edge of 10c.

Opening cut line 11, as shown in Figure 4A, it is composed of those sequences predetermined width, a plurality of slits 11 ₁ consisting of recessed groove length and depth in a row at predetermined intervals . This unsealing cut line 11 will be described with a plastic packaging material 100 for producing a packaging bag to be described later.

Cut lines 12 tear also, as shown in FIG. 5A, it consists of those sequences predetermined width, a plurality of slits 21 ₁ consisting of recessed groove length and depth in a row at predetermined intervals Yes. The tear cut line 12 will also be described with reference to a plastic packaging material 100 for producing a packaging bag described later.

  The bottom film 10a, the two side films 10b and 10c, and the top film 10d described above are made of a plastic packaging material 100 made of a single plastic film. That is, the packaging bag 10 is made using this plastic packaging material 100.

  Hereinafter, the plastic packaging material 100 will be described with reference to FIG. FIG. 3 is a plan view of a plastic packaging material for making gusset packaging bags.

Plastic packaging material 100, as shown in FIG. 3, a predetermined length, is made of a plastic film 10 ₀ long with the width and thickness.
The plastic film 10 ₀ is to use a laminated film obtained by laminating at least a substrate layer and a peelable sealant layer. The base material layer is a biaxially stretched plastic film such as a biaxially stretched polypropylene film, a biaxially stretched nylon film, or a biaxially stretched polyester film. The easy-peeling sealant layer is a polyolefin resin film of different multilayers. The easy-open film is already known as having excellent straight cut property (longitudinal direction), and this known film is used in this embodiment. When such a laminated film is used, when the upper film 10d is torn from the back seal portion 13, the upper film 10d is torn linearly from there toward the opening cut line.

Plastic packaging material 100, a predetermined length L, a made of plastic film 10 ₀ long with the width W and thickness, the plastic film 10 ₀ of the long is the longitudinal center of the predetermined width dimension W ₁ and the bottom film area 10 _a, the first and the folded area 10 _AB, 10 _AC are thermally welded are clamshell with a predetermined width dimension W within ₁₂ extend respectively from opposite ends of the bottom film area, these folding The side film areas 10 _B and 10 _C each extending from the area and folded at a predetermined width length W ₂ , and the _second film areas are folded in two from the both edges of the side areas within the predetermined width length W ₂₃ and heat-sealed. It is _{divided into} two bent areas 10 _BD1 and 10 _CD2 and upper film piece areas 10d ₁ and 10d ₂ extending from these bent areas. The respective edge areas a1 and a2 of the upper surface film piece areas 10d ₁ and 10d ₂ are palm-attached areas that are joined to each other and thermally welded to form the back seal portion 13. Moreover, the upper surface film 10d is formed by the upper surface film piece areas 10d ₁ and 10d ₂ . Note that the dividing lines shown in FIG. 3 are described for ease of explanation, and the actual plastic packaging material does not have such dividing lines.

Long plastic film 10 ₀ of scale has a length L, a width W and wall thickness are the type of articles to be packaged, selected by size, etc., are determined. The widths W ₁ and W _{2 of the} bottom film area 10A and the side film areas are also determined by the items to be packaged. The widths W ₁₂ and W ₂₃ of the first, second and third and fourth bent portions are about 3 to 10 mm. The total width of the top film pieces 10d ₁ and 10d ₂ is substantially the same as the width of the bottom film area. Further, among the upper top film pieces _10d 1, 10d ₂ of the back lined areas a1, a2, is one of the back lined area a2 is longer 8 to 20 mm. The part that protrudes for a long time becomes a knob when the back seal portion 13 is opened.

An opening cut line 11 is formed in each of the second bent areas 10 _BD1 and 10 _CD2 . These opening cut lines 11 are on the first surface (surface provided with a sealant layer) of each film in the second folding area 10 _BD1 , 10 _CD2 , and each upper surface film 10 d ₁ , It is formed in an area located on the 10d ₂ side. Moreover, the opening cut line 11 may be the same position bent.

  With reference to FIG. 4, the configuration of the opening cut line will be described. 4 shows an opening cut line, FIG. 4A is an enlarged view of the IVA portion of FIG. 3, FIG. 4B is a cross-sectional view taken along line IVB-IVB of FIG. 4A, and FIG. 4C is a slit of a modification of FIG. It is sectional drawing shown.

Each opening cut line 11 of the second folding area _{10 BD1, 10 CD2} have the same structure. One opening cut line 11, as shown in FIG. 4B, a predetermined width along the longitudinal direction, a plurality of slits 11 ₁ consisting of recessed groove length and depth are arranged in a row at predetermined intervals It has become. That is, the slits 11 _1, as shown in Figure 4B, and is formed with a concave groove 11a having a predetermined depth. The concave shape of the concave groove 11a may be an arbitrary shape, for example, a shape in which the bottom is thinnest and the thickness gradually increases from the bottom toward the surface. The opening cut line 11 is thermally welded to the side film, but the welded top film can be smoothly torn along the opening cut line. Further, when the pressure of the bag body when using a microwave oven increases, the concave groove 11a of the slit 11 ₁ is broken only minimal site Relieve upward pressure to the outside, it can be prevented bursting of the bag.

The opening cut line 11A of the modified example is formed by a slit provided with a concave groove 11a and a crack 11b having a predetermined depth inserted into the bottom of the concave groove. According to the opening cut line 11A, the upper surface film 10a can be further smoothly torn along the cut line. Further, when the time of a microwave oven operating pressure of the bag body is increased, easily further torn slits 11 ₂ can be prevented bursting of the bag.

  With reference to FIG. 5, the structure of the tearing cut line is demonstrated. 5 shows a tear cut line, FIG. 5A is an enlarged view of the tear cut line VA portion of FIG. 3, FIG. 5B is a cross-sectional view taken along the line VB-VB of FIG. 5A, and FIG. It is sectional drawing of the tearing cut line of a modification.

A tear cut line 12 is formed in one back pasting area a1 (see FIG. 3) of the back pasting areas a1 and a2 to be the back seal portion 13. The cut line 12 is composed of a plurality of slits (slits). As shown in FIGS. 3 and 5B, the cut line 12 extends from a recessed groove having a predetermined width, length, and depth along the longitudinal direction. a plurality of slits 12 ₁ formed becomes to those arranged in a line at predetermined intervals. These tear slits 12 _1, as shown in FIG. 5B, and is formed with a concave groove 12a having a predetermined depth. The concave shape of the concave groove 12a may be an arbitrary shape, for example, a shape in which the bottom is thinnest and the thickness gradually increases from the bottom toward the surface. The back pasting area a2 provided with a plurality of slits is pasted together with the other back pasting area a1 to form the back seal portion 13.

By providing the tear cut line 12 in the back seal portion 13, the top film 10d can be torn from an arbitrary location. Further, when the pressure of the bag body when using a microwave oven increases, escape upward pressure torn concave groove 11a of the slit 11 ₁ to the outside, it can be prevented bursting of the bag.

  As shown in FIG. 5C, the tearing cut line 12A of the modification is formed by a slit provided with a concave groove 12a and a crack 12b having a predetermined depth inserted into the bottom of the concave groove. By providing the tear cut line 12A in the back seal portion 13, the top film 10d can be torn from an arbitrary location.

  Returning to FIG. 3 again, the production of a packaging bag using the plastic packaging material 100 will be described. The packaging bag is made by an automatic packaging machine. In addition, since an automatic packaging machine uses a well-known thing, description is abbreviate | omitted.

To make the packaging bag 10, first, a plastic packaging material (hereinafter also referred to as packaging material) 100 is set in an automatic packaging machine (not shown). The set wrapping material is subjected to two-fold heat welding of the first folding areas 10 _AB and 10 _AC of the bottom film area 10 _A by an automatic wrapping machine to form the welded portions 10ab and 10ac (FIG. 2A). These welds become the first and second corners of the bottom of the bag when the bag is formed.

Next, the second folding areas 10 _BD1 and 10 _CD1 of the both side film areas 10 _B and 10 _C are heat-welded in two so that the unsealing cut line 11 faces the upper film side, and welded portions 10bd ₁ and 10cd ₂ ( FIG. 2A) is formed. These welded portions become the third and fourth corners at the top of the bag when the bag is formed. Thereafter, the back seal portion 13 is formed by gluing both ends of the upper surface film pieces 10d ₁ and 10d ₂ and then cut by a predetermined length in the longitudinal direction to form a cylindrical body having both ends opened.

Thus, a wide bottom films 10a, surrounded by the back low Do side film 10b, 10c and the bottom surface film substantially the same size as the upper surface film 10d, the welded portion 10ab which each film is _heat-welded, 10ac, 10bd 1, 10cd ₂ Are the first to fourth corners, and a gusset type short cylindrical body having both ends opened is formed. In this cylindrical body, first, one opening 10e is heat-sealed and sealed to form an end seal portion 14, and the other opening 10f is filled with an object to be packaged and heat-sealed and sealed to end seal portion 15. Is formed, and the packaging bag 10 in which the article to be packaged is packed is formed. The packaged item can be loaded by packing the packaged item in a box-shaped tray. By using this plastic packaging material 100, this packaging bag can be easily produced by an automatic packaging machine. Of course, you may produce with a separate film.

The packaged packaging bag 10 is thermally welded at the end seal portions 14 and 15 and the back seal portion 13 and the four corners at both ends of the bag body. The welding strength of the seal portions 14 and 15 is heat-welded with higher strength than the other back seal portions 13 and 10bd ₂ and 10cd ₂ constituting the third and fourth corners. By increasing the strength of the end seal portions 14 and 15 in this way, the packaged material does not jump out of these places, and when opening, from the third and fourth corners. The top film 10d can be easily opened. Even when the internal pressure rises when used in a microwave oven, the top film 10d is peeled off at the third and fourth corners, and the rising pressure is released from the slits constituting the opening cut line 11. Will not burst. Further, pressure at the time of using the microwave oven is also released from an arbitrary portion of the tear cut line 12 of the back seal portion 13.

With reference to FIGS. 6 and 7, the opening of the mushroom used in this microwave oven will be described. 6 shows the opening state of the opening cut line when using the microwave oven, FIG. 6A is a state before opening, FIG. 6B is during the opening, and FIG. 6C is a sectional view at the time of opening. When a package containing moisture, for example, a packaging bag 10 packaging food, is heated in a microwave oven, the moisture contained in the food vapors and the pressure in the bag rises. Due to this pressure increase, the bag body swells and the rising pressure is applied to the upper surface film piece 10d. When elevated pressure is applied to the upper surface film 10d, third, fourth weld portion 10bd _2, 10cd 2 corners is lifted upward, the welded portion is started peeling, the opening cut lines 11 the peeling progresses The concave groove 11a constituting the slit is broken, and the boosting force is released. Figure 6A~ 6C show one of the open state of the welded portion 10 cd _2.

With reference to FIG. 7, the opening method of a packaging bag is demonstrated. 7 is a view for explaining a method of opening the gusset packaging bag of FIG. 1. FIG. 7A is a perspective view before opening, and FIG. 7B is a perspective view after opening.
The packaging bag 10 can be opened with a desired size and a clean opening shape from any location on the top surface. That is, when tearing from the position (FIG. 7A) indicated by the dotted line of the back seal portion 13, the top films 10d ₁ and 10d ₂ are torn toward both ends, and when the leading ends reach the unsealing cut lines 11 at both ends, The cutting direction is changed from a direction orthogonal to the back seal portion to a parallel direction, and is cut along the opening cut lines 11 at both ends. Since this opening is opened from any part of the back seal part along the opening cut line through the top film, the opening can be opened to a desired size and opened in a clean shape. The piece can also be excised from the top film (FIG. 7B). In addition, after opening, the package is opened with a desired size and a clean opening shape, so that the packaged item does not pop out to the outside without changing the packaged item to another (for example, spills) It can be used as a deep bottom container.

  As described above, the packaging bag 10 can be used for a microwave oven. That is, even if the packaged item is heated in the microwave oven, it can be used safely and safely without being ruptured. And after heating in a microwave oven, it can be opened to any size and with a clean opening shape, so there is no risk of contaminating the surroundings or burns to the hand when opening, and packaging after opening Can be used with containers without transferring things to others.

[Embodiment 2]
With reference to FIG. 8, the gusset packaging bag which concerns on Embodiment 2 of this invention is demonstrated. FIG. 8 is a perspective view of the gusset packaging bag according to the second embodiment.

  The gusset packaging bag 10A according to the second embodiment is the same except that the configuration of a part of the packaging bag 10 of the first embodiment, that is, the opening cut line and the back seal portion is changed. The following description details the changed configuration, and a description of the common configuration is omitted.

  The gusset packaging bag (hereinafter referred to as packaging bag) 10A according to the second embodiment is similar to the packaging bag 10 of the first embodiment, and the upper surface film 10d is provided with opening cut lines 11B at both end edges, respectively. It is heat-welded to the edge of 10b, 10c, and has a configuration in which a tear cut line 12B is provided in the back seal portion 13.

The unsealing cut line 11B is a line in which the perforations are arranged in a straight line instead of the unfolding cutting lines 11 of the bent areas _10BD1 and _10CD2 (see FIG. 3) of the plastic packaging material 100. Each bending area provided with the perforation is heat-welded with the bending to form welded portions 10bd ₁ and 10cd ₂ respectively (see FIG. 9). The unsealing cut line 11B is not limited to the perforation, and other things such as continuous (eg, half cut line) or non-continuous grooves, non-continuous through holes or non-through holes are defined. Any of linearly arranged at intervals may be used.

  Further, the cut cut line 12B is provided with a plurality of notches (notches) at predetermined intervals in the longitudinal direction of the back seal portion 13. These notches are formed in a direction perpendicular to the length direction of the back seal portion. This notch (notch) is used to create a trigger for tearing the back seal part. If it is a generally known notch such as an I-shaped notch, V-shaped notch, U-shaped notch, etc. Good. According to this packaging bag 10A, the bag body can be opened to the left and right, and the opened bag can be used as it is as a food tray for meals.

10,10A gusset packaging bag 10a bottom film 10b, 10c side films 10d top film 10e, 10f opening _10d 1, 10d ₂ top film piece 10 ₀ plastic films 11, 11A, 11B opening cut lines ₁₁ 1, 11 ₂ slit 11a recessed groove 11b Crack 12, 12A, 12B Cut line 12 ₁ , 12 ₂ Slit 12a Recessed groove 12b Crack 13 Back seal part 14, 15 End seal part 100 Plastic packaging material

Claims (8)

A bottom film, a pair of opposing side films that are connected and folded at both end edges of the bottom film, and a top film that is connected to the upper end edges of the both side films and is substantially pasted at the center and provided with a back seal part; Forming a cylindrical body with both ends opened, and one end opening is pre-sealed and sealed, and the other end opening is a bag body that is packaged with the object to be packaged by heat-sealing and sealing.
The gusset packaging bag, wherein the upper film is provided with an opening cut line at both end edges and is thermally welded to an end edge of the side film, and a tear cut line is provided at the back seal portion.   The opening cut line is either a through hole or a non-through hole in which the upper film surface is half-cut, a plurality of through holes or non-through holes, and a combination of these holes arranged in a line at a predetermined interval. The gusset packaging bag according to claim 1, wherein the gusset packaging bag is formed of.   The gusset packaging bag according to claim 1, wherein the opening cut line is formed by a recessed groove having a predetermined width, length, and depth.   The tear cut line is formed by forming a plurality of notches orthogonal to the longitudinal direction of the back seal part at a predetermined interval from one end to the other end in the longitudinal direction of the back seal. The gusset packaging bag according to any one of claims 1 to 3.   2. The tear cut line is formed in the back seal portion, and is formed by a recessed groove having a predetermined width, length, and depth on one joining surface of the upper surface film. The gusset packaging bag in any one of -3.   The gusset packaging bag according to any one of claims 1 to 5, wherein the bag is made of a single plastic film.   The gusset packaging bag according to claim 6, wherein the plastic film is a laminated film in which at least a base material layer and an easily peelable sealant layer are laminated.   The gusset packaging bag according to claim 7, wherein the heat-sealing seal of the opening is welded with higher strength than heat-sealing at other locations.