JP7302407B2 - Easy-open packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to an easy-open packaging bag that can be opened by manually peeling off the sealed portions of overlapping films.

2. Description of the Related Art As packaging bags for storing contents used for medical purposes, etc., there is a type in which a part of the packaging bag is cut off at the time of opening and the contents are taken out. However, in this case, some of the cut pieces of the cut packaging bag become foreign matter, and the cut pieces scatter outside the packaging bag and adhere to or mix with other medical equipment, which can lead to medical accidents. obtain. Therefore, packaging bags are used which do not leave the cut pieces and are easy to peel off by hand.

For example, in Patent Document 1, sealant layers made of different resins in a laminate film are superimposed on each other, and a gripping portion as a non-sealing portion is provided outside the sealing portion at the opening start portion. An open packaging bag is disclosed. This packaging bag can be easily opened by lightly pulling the film on both ends of the sealed film to the left and right from the grasping portions.

However, deformation such as curling and wrinkling may occur in the non-sealed grip portion due to the difference in stress and strain generated in the films at both ends during bag making, the heat sealing temperature, and the like. As a result, it may be difficult to open the bag because it is difficult to grasp the grip with fingers, and the film may be torn due to the curled portion being caught during bag making or transportation, causing pinholes, or unintentional opening of the packaging bag. As a result, the contents may be contaminated.

Patent Literature 2 discloses a packaging bag that has the effect of preventing the film from curling. In Patent Document 2, a non-thermally bonded portion is formed along one side of a rectangular laminated sheet made of one breathable sheet and the other synthetic resin sheet, and a substantially U-shaped peripheral heat seal is formed on the other three sides. Forming and connecting the bonding part, forming a storage part and a protruding thermally bonded part protruding outward toward the non-thermally bonded part, the peripheral thermally bonded part and the projecting thermally bonded part are detachable, and the projecting thermally bonded part Disclosed is an easy-open packaging bag for sterilization, which has an extension part in which one of an air permeable sheet and a synthetic resin sheet extends outward by a predetermined dimension at the edge part of one side forming a part. Further, peelable point seal portions for curl prevention are provided at both corners of one side edge portion where the protruding heat-bonded portion is formed, and the breathable sheet and the synthetic resin sheet are easily heat-bonded in a separable manner. An openable sterilization packaging bag is also disclosed.

Not only can the air-permeable sheet and the synthetic resin sheet be picked up and separated from each other to open the packaging bag, and the contents can be easily taken out, but also the two corners of the edges of one side where the protruding heat-bonded portions are formed can be opened. The point seal portion prevents curling of the non-thermally bonded portion.

However, since it is necessary to provide a point seal portion in order to prevent curling of the film, it is necessary to prepare a separate member, which increases the number of manufacturing processes and is troublesome. There is also the problem that the handle slips when the packaging bag is opened, making it difficult to grip and open.

Japanese Utility Model Laid-Open No. 1-96845 Japanese Patent Application Laid-Open No. 2007-331781

The present invention has been made in view of the above problems. To provide an easily openable packaging bag which does not cause the problem of contamination of contents, improves the gripping property of a grip part when unsealed, and does not require labor in manufacturing.

The invention according to claim 1 is an easy-to-open sheet formed by overlapping the inner surfaces of two rectangular synthetic resin sheets or the inner surfaces of a rectangular synthetic resin sheet and a rectangular breathable sheet so as to face each other. In the packaging bag, a non-sealed portion provided along the upper side, a left side sealed portion provided along the left side, a right side sealed portion provided along the right side, and a lower side provided along the lower side a seal portion; and a convex seal portion that is connected to the left side seal portion and the right side seal portion at the ends on the upper sides thereof and protrudes toward the non-seal portion, wherein the convex seal portion; The left seal portion and the right seal portion are detachably adhered to each other, and a heat-treated portion having a coefficient of static friction of 0.20 or more is provided on the inner surface of the synthetic resin sheet in the non-seal portion. An easy-open packaging bag characterized by:

In the invention according to claim 2, either one of the two superimposed synthetic resin sheets or either one of the superimposed synthetic resin sheet and the breathable sheet is directed outward. 2. The easy-open packaging bag according to claim 1, having an extended extension portion.

The invention according to claim 3 is characterized in that the length of an imaginary vertical line from the bent portion of the convex seal portion to the upper side of the easy-open packaging bag is 5 mm or more and 15 mm or less. The easy-open packaging bag according to claim 1 or claim 2.

The invention according to claim 4 is an easy-open packaging bag in which the inner surfaces of the synthetic resin sheet and the air-permeable sheet are placed facing each other, wherein the air-permeable sheet is made of sterilized paper or non-woven fabric, 4. The easy-open packaging bag according to any one of claims 1 to 3, characterized by having a heat seal layer on the surface to be adhered to the synthetic resin sheet.

The present invention has a convex seal portion protruding toward a non-seal portion, and the convex seal portion and the left and right side seal portions are adhered to each other so as to be peelable, and the non-seal portion beyond the convex seal portion is attached. A heat-treated portion having a coefficient of static friction of 0.20 or more is provided on the inner surface of the synthetic resin sheet in the portion.

Due to the heat-treated part on the inner surface of the synthetic resin sheet in the non-sealed part as a grip part, the difference in stress and strain generated in the two sheets overlapped during bag making, the heat sealing temperature, heat during sterilization, or steam It is possible to prevent the non-sealed portion of the synthetic resin sheet as a gripping portion from being deformed due to curling or wrinkling due to a difference in thermal shrinkage due to influence. Therefore, it is easy to open the packaging bag without difficulty in gripping it when unsealing due to the deformation. In addition, there is no risk of contamination of the contents due to tearing or pinholes in the film due to catching of the curled portion during bag making, transportation, storage, or the like.

Furthermore, the heat-treated portion on the inner surface of the synthetic resin sheet improves the gripping property of the gripping portion, and the sealing portion can be easily peeled off to open the packaging bag without slipping of the handle. The heat-treated portion for preventing deformation and gripping is only heat-treated in the same manner as the heat-bonding for bonding the two sheets, so that it does not take time and effort in manufacturing.

1 is a schematic front view showing a first embodiment of an easy-open packaging bag according to the present invention; FIG. FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. 1; FIG. 3 is an explanatory diagram showing an example of an enlarged state in which the grip portion of FIG. 2 is unsealed; Fig. 2 is a schematic front view showing a second embodiment of an easy-open packaging bag according to the present invention; 1 is a schematic front view showing a first embodiment of an easy-open packaging bag according to a conventional example; FIG.

Hereinafter, examples of the easy-open packaging bag according to the present invention will be described with reference to the drawings as necessary.

FIG. 1 is a schematic front view showing a first embodiment of an easy-open packaging bag 1 according to the present invention. The easy-open packaging bag 1 includes a vertically long rectangular synthetic resin sheet 2 and a vertically long rectangular air-permeable sheet 3, which are superimposed with their inner surfaces facing each other, and have a non-sealed portion 5 provided along an upper side 4 and a left side 6. A left seal portion 7 provided along the edge 8 and a right seal portion 9 provided along the right edge 8 are formed. The non-sealed portion 5 is a portion that becomes a so-called gripping portion when unsealing. The sealing portion may be formed as described above by stacking two vertically long rectangular synthetic resin sheets 2 on top of each other.

A lower seal portion 11 is formed along the lower edge 10 . This lower seal portion 11 is a portion that is adhered after the content 14 is accommodated. Before the content 14 is accommodated, the lower side 10 is not adhered and is open. The convex seal portion 12, the left seal portion 7, and the right seal portion 9 are adhered to each other in a detachable manner. The convex seal portion 12, the left seal portion 7, the right seal portion 9, and the lower seal portion 11 are connected to form a storage portion 13 in a portion surrounded by these seal portions.

Further, a convex seal portion 12 is formed that connects the left seal portion 7 and the right seal portion 9 at their ends on the upper side 4 side and protrudes toward the non-seal portion 5 . The convex seal portion 12 does not reach the upper side 4 and is formed with a width that allows the user to grasp it, in order to exhibit the function of the gripping portion. Specifically, the length of the imaginary vertical line B from the bent portion of the convex seal portion 12 to the upper side 4 of the easy-open packaging bag 1 is preferably 5 mm or more and 15 mm or less. This imaginary vertical line B is a vertical line to the linear upper side 4 . If it is shorter than this, it will be difficult to grip, and if it is longer than this, the material will be wasted.

A heat treatment portion 15 is provided in the non-seal portion 5 . Since the heat-treated portion 15 is for preventing deformation and improving grip as described later, it is preferable to provide the heat-treated portion 15 along the edge of the sheet at the top edge 4 serving as the unsealing start portion, as shown in FIG. Moreover, the heat-treated portion 15 may be provided not only along the upper side 4 but also along the entire non-sealed portion 5 .

FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. FIG. 3 is an explanatory diagram showing an enlarged example of a state in which the easy-open packaging bag 1 is opened by peeling off the unsealed portion 5 as the grip portion of FIG.

As shown in FIGS. 2 and 3 , the heat-treated portion 15 on the non-sealed portion 5 is provided on the inner surface of the synthetic resin sheet 2 . The inner surface of the synthetic resin sheet 2 is the surface that is overlapped with the air-permeable sheet 3 at the time of bag making. This inner surface can be, for example, a sealant layer.

The inner surface of the synthetic resin sheet 2 in the non-sealed portion 5 is provided with a heat-treated portion 15 having a static friction coefficient of 0.20 or more according to JISK7125:1999 Plastics-Films and Sheets-Friction Coefficient Test Method. This heat treatment portion 15 is provided in a fine uneven shape, and is a portion to be gripped by hand when starting to open the package. By setting the above friction coefficient, the difference in stress and strain generated in the two sheets that are superimposed during bag making, the heat sealing temperature, the heat during sterilization, the difference in heat shrinkage due to the influence of water vapor, etc. It is possible to prevent deformation due to curling, wrinkling, or the like in the non-sealed portion of the resin sheet as the grip portion. Therefore, it is easy to open the packaging bag without difficulty in gripping it when unsealing due to the deformation. In addition, there is no risk of contamination of the contents due to tearing or pinholes in the film due to catching of the curled portion during bag making, transportation, storage, or the like.

Furthermore, the heat-treated portion 15 having the coefficient of friction described above improves the gripping property of the gripping portion, and the sealing portion can be easily peeled off to open the packaging bag without the handle slipping.

The heat treatment portion 15 is provided by applying heat at a temperature of 120° C. or more and 130° C. or less to the inner surface of the synthetic resin sheet 2 for 0.3 seconds or more and 0.5 seconds or less.

As shown in FIG. 4, the heat-treating section 15 prevents the two sheets from slipping easily when the two sheets are unsealed, so that the two sheets can be firmly grasped. Since it can be grasped firmly, it becomes possible to separate and open the two sheets more easily.

As described above, in order to make it easier to grip the non-sealed portion 5 as a grip portion, the length of the virtual vertical line B from the bent portion of the convex seal portion 12 to the upper side 4 of the easy-open packaging bag 1 is 5 mm. It is preferable to form it so as to be 15 mm or less. If it is shorter than this, it will be difficult to grip, and if it is longer than this, the material will be wasted.

FIG. 4 is a schematic front view showing a second embodiment of an easy-open packaging bag according to the present invention. The difference between the easy-open packaging bag 1 of the second embodiment and the first embodiment is that an extending portion 16 is provided as shown in FIG. Others are the same as those of the first embodiment.

The extending portion 16 is provided by extending one of the synthetic resin sheet 2 and the air-permeable sheet 3 outward. The extending portion 16 makes it easier to grasp the ends of the two overlapping sheets when opening the easy-open packaging bag 1 is started. In both the synthetic resin sheet 2 and the air permeable sheet 3, the extending portion 16 preferably has a length of an imaginary vertical line to the upper side 4 of the easy-open packaging bag 1 of 5 mm or more and 10 mm or less. If it is shorter than this, it will be difficult to grip. Conversely, if it is longer than this, not only will the material be wasted, but the protruding end will easily get caught during transport or when held by hand, tearing the film or sheet, or damaging the packaging bag. This is because unintended opening occurs.

(About synthetic resin sheet)
The easy-open packaging bag 1 can be used for foods, medical supplies, pharmaceuticals, and the like. Especially when used for medical purposes, it is sterilized with high-temperature steam, gas such as ethylene oxide gas (EOG). Therefore, when the packaging bag 1 is used for medical purposes in particular, the synthetic resin sheet 2 must have transparency to allow the contents to be visually recognized, heat resistance to withstand the heat sealing temperature during bag making and heat during sterilization, and air permeability. It needs to be thermally adhered to the sheet and have an appropriate adhesive strength, and is not particularly limited as long as it has these functions. The synthetic resin sheet 2 is mainly used by laminating a base layer and a sealant layer. The thickness of the synthetic resin sheet 2 is preferably 10 μm or more and 60 μm or less.

Examples of base material layers include polyester films, polyethylene films, polypropylene films, nylon films, polystyrene films, polycarbonate films, polyacrylonitrile films, polyimide films, polyvinyl alcohol films, and polyvinylidene chloride films.

Examples of the sealant layer that adheres to the other breathable sheet include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, ionomer, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer. polymers, ethylene-acrylic acid copolymers, ethylene-acrylic acid ester copolymers, and the like. It is preferable that this sealant layer has an easy-peel property so that the seal can be stably peeled off by the opening force.

An intermediate layer may be laminated between the base material layer and the sealant layer. The intermediate layer can be provided, for example, when it is necessary to improve various physical properties such as gas barrier properties against oxygen and water vapor, light shielding properties, and piercing properties.

The base layer, intermediate layer, and sealant layer are laminated by a known lamination method such as a T-die method or an inflation method.

(About breathable sheet)
On the other hand, the air-permeable sheet 3 is sterilized or sterilized before use, especially for medical applications. Especially for medical applications, the breathable sheet 3 is impermeable to bacteria, heat resistant to withstand heat during sterilization, moisture resistant to steam, and breathable to be heat-bonded to the synthetic resin sheet 2. Any substrate having properties may be used. In addition, it is preferable to have a heat-seal layer on the surface to be adhered to the synthetic resin sheet 2 as long as there is no problem in maintaining adhesion to the synthetic resin sheet 2 (weakening of adhesion, peeling, etc.). Examples of the heat seal layer include heat seal lacquer and low density polyethylene (LDPE) extruded by Ruder, but are not particularly limited.

As the air-permeable sheet 3, for example, sterilized paper, non-woven fabric, etc. can be used, and these base materials are coated with the above-mentioned heat-sealing layer or a material having a function such as hydrophilicity or water repellency on the entire surface or in part as a functional layer. can be laminated.

The sterilized paper used as the breathable sheet 3 is preferable in that it has excellent bactericidal properties, bactericidal resistance, and air permeability, and also has characteristics peculiar to paper such as bag-making properties and printability. In addition, since the sterilized paper is excellent in bag-breaking strength, it is possible to maintain the quality of the contents and good hygiene. As a material for the sterile paper, for example, there is Tyvek (registered trademark) manufactured by DuPont. The thickness of the sterilized paper is preferably 100 μm or more and 200 μm or less.

The nonwoven fabric used as the breathable sheet 3 has a porous structure. Therefore, it is preferable in that it also has characteristics such as high air permeability, high water absorption, and high moisture retention. In addition, nonwoven fabrics have extremely high productivity and are suitable for mass production of the easy-open packaging bag 1 . Furthermore, the nonwoven fabric can be controlled in density from dense to bulky and its thickness can be freely changed, so it is also suitable for manufacturing the easy-open packaging bag 1 according to the type of contents.

Examples of nonwoven fabric materials include polyester, polypropylene, rayon, nylon, biodegradable fibers, pulp, and cotton. In particular, polypropylene can be preferably used. By using this polypropylene, a nonwoven fabric having excellent breathability, waterproofness, antibacterial properties, and bag-breaking strength can be obtained. Spunbond nonwoven fabrics, meltblown nonwoven fabrics, and nonwoven fabrics made of fibrillated three-dimensional network fibers by flash spinning are known as polyolefin nonwoven fabrics. Non-woven fabrics produced by the flash spinning method have very fine and complicated cross-sectional shapes, and can be used for various purposes by utilizing characteristics such as whiteness, opacity, and lightness. The thickness of the nonwoven fabric is preferably 100 μm or more and 200 μm or less.

As a laminated structure when the synthetic resin sheet 2 and the air-permeable sheet 3 are superimposed, for example, nonwoven fabric//polyethylene (PE)/polyethylene terephthalate (PET), or nonwoven fabric/undercoat/heat seal lacquer// Examples include polyethylene (PE)/polyethylene terephthalate (PET). (// indicates a peeling surface between the synthetic resin sheet 2 and the breathable sheet 3.) Note that, without being limited to these, any combination of sheets having a peelable layer structure can be used. can. The latter adds a heat seal lacquer (heat seal layer) mainly composed of ethylene vinyl acetate resin to the structure of the former breathable sheet 3 via an undercoat (anchor coat layer) mainly composed of acrylic resin or the like. This improves the releasability from the synthetic resin sheet 2 .

(Manufacturing method of easy-open packaging bag)
First, one surface of the synthetic resin sheet 2 is provided with a heat-treated portion 15 having a static friction coefficient of 0.20 or more according to JISK7125:1999 Plastics-Films and Sheets-Friction Coefficient Test Method. The heat treatment portion 15 is provided by applying heat at a temperature of 120° C. or higher and 130° C. or lower to one surface of the synthetic resin sheet 2 for 0.3 seconds or longer and 0.5 seconds or shorter. A portion of the inner surface of the synthetic resin sheet 2 where the heat-treated portion 15 is provided becomes a non-sealed portion 5 when the breathable sheet 3 is overlapped and adhered. The heat-treating portion 15 may be provided on the entire inner surface of the synthetic resin sheet 2, but this is not preferable because it may adversely affect the permeability of the synthetic resin sheet 2, such as increasing cloudiness. The heat-treated portion 15 for preventing deformation and improving the gripping property is only heat-treated in the same manner as heat-bonding for bonding two sheets, which will be described later.

Next, the synthetic resin sheet 2 provided with the heat-treated portion 15 and the breathable sheet 3 are overlaid and heat-bonded by the convex seal portion 12, the left seal portion 7, and the right seal portion 9 so as to be peelable. The seal portion 11 is in an unbonded and open state. The content 14 is accommodated in the opening, and the unbonded lower seal portion 11 is heat-bonded and sealed. Methods for forming the seal portions include heat sealing, heat lamination, dry lamination, and the like.

When storing medical goods and medical drugs, the contents 14 are sterilized in advance, and after sealing the contents 14, sterilization such as high-temperature steam, autoclave sterilization, and ethylene oxide gas (EOG) sterilization is performed. conduct. As this sterilization method, a method of irradiating with radiation, a method of using an autoclave, a method of using plasma sterilization, or the like can be adopted.

(How to use the easy-open packaging bag)
A heat treatment portion 15 provided at the end of the sheet at the unsealed portion of the upper side 4 of the inner surface of the synthetic resin sheet 2, which is the opening start portion, and the unsealed portion of the upper side 4 of the breathable sheet 3, which is the opening start portion. Grasp the edge of the sheet with a hand and pull the synthetic resin sheet 2 and the air-permeable sheet 3 in directions opposite to each other. By pulling the two sheets in directions opposite to each other, the convex seal portion 12 and the left and right side seal portions 4 and right side seal portions 9 which are peelably adhered can be peeled off one by one. Since each of the seal portions is adhered in a detachable manner, the two sheets can be easily detached and opened by lightly pulling the two sheets in opposite directions. And it becomes possible to take out the contents 14 easily.

If the lower seal portion 7 is adhered without making it removable, the two sheets are sequentially peeled off from the convex seal portion 12 as described above, and when approaching the lower seal portion 11, they become difficult to peel off. . By doing so, the two sheets are connected at the lower seal part 7, and the bag to be discarded after opening is not divided, so that it is easy to discard, and medical accidents due to foreign matter contamination due to forgetting to discard one sheet. can also be prevented.

(Example)
Next, the easy-open packaging bag according to the present embodiment will be further described using examples and comparative examples. However, the present invention is not limited to the following examples.

As Example 1 of the present invention, the packaging bag 1 shown in FIG. 1 was used. On the other hand, as Comparative Example 1, the packaging bag 20 shown in FIG. 5 was used. FIG. 5 is a schematic front view showing a first embodiment of an easy-open packaging bag according to a conventional example. The packaging bag 1 of Example 1 is provided with the heat treatment section 15 , but the packaging bag 20 of Comparative Example 1 is not provided with the heat treatment section 15 .

The laminated structure of the synthetic resin sheet 2 and the air-permeable sheet 3, which respectively constitute the packaging bag 1 of Example 1 and the packaging bag 20 of Comparative Example 1, is a nonwoven fabric (Tyvek (registered trademark) manufactured by DuPont) // Polyethylene (PE) (50 μm)/polyethylene terephthalate (PET) (12 μm). In addition, the packaging bag 1 of Example 1 and the packaging bag 20 of Comparative Example 1 have all the longitudinal and lateral dimensions, the shapes and dimensions of the left and right side seal portions 7 and 9, the lower seal portion 11, and the convex seal portion 12. are the same. Furthermore, the contents housed in both the packaging bag 1 and the packaging bag 20 are writing utensils.

The heat treatment temperature when providing the heat treatment portion 15 of the packaging bag 1 of Example 1 is 120° C. or more and 130° C. or less, and the static friction coefficient of the heat treatment portion 15 provided after the heat treatment is 0.22 or more and 0.24 or less. be.

The grip performance and unsealing performance of the non-sealed portion 5 as a grip portion were compared between the packaging bag 1 of Example 1 and the packaging bag 20 of Comparative Example 1, respectively. Table 1 shows the evaluation results.

In Example 1, since deformation such as curling does not occur at the end of the upper side 4 in the non-sealed portion 5 as the knob portion due to the heat treatment portion 15, the non-sealed portion 5 as the knob portion communicates with the synthetic resin sheet 2. The non-sealed portions 5 of the adhesive sheet 3 can easily catch the ends of the upper side 4 without slipping, and the two sheets can be easily peeled off by pulling them in opposite directions. I was able to take it out.

On the other hand, in Comparative Example 1, since the heat treatment portion 15 is not provided, the end portion of the upper side 4 is curled at the non-sealed portion 5 as the grip portion, and the synthetic resin sheet 2 is pulled from the non-sealed portion 5 as the grip portion. Since it is difficult to catch the end of the upper side 4 with the non-sealed portion 5 of each of the air-permeable sheets 3, and it is difficult to slip and grip, it is difficult to separate the two sheets by pulling them in opposite directions. was not easy to remove.

In the packaging bag 1 having the laminated structure described above, when the heat treatment temperature is set to 110° C. and the static friction coefficient of the heat treatment section 15 provided after the heat treatment is set to 0.16 or more and 0.17 or less, the heat treatment section 15 is provided. The same result was obtained without In other words, the non-sealed portions 5 of the synthetic resin sheet 2 and the breathable sheet 3 are less likely to grasp the ends of the upper side 4 than the non-sealed portions 5 serving as grasping portions, and it is difficult to grip the two sheets by slipping. It was difficult to peel off by pulling in the direction of pulling, and it was not easy to open and take out the contents 14.例文帳に追加

Furthermore, in the packaging bag 1 having a laminated structure, if the heat treatment temperature is set to 140° C. or higher and the heat treatment unit 15 is provided, the sticking of the linear low-density polyethylene (LLDPE) to the hot plate used for the heat treatment increases, which is preferable. do not have. In this case, polyethylene (PE) accumulates on the seal bar during bag making, and when the seal bar is peeled off, foreign matter may be mixed in, or the film (sheet) transportation may be hindered, resulting in pitch defects (misalignment). In addition, in a three-sided seal bag in which the length of an imaginary vertical line from the bent portion of the convex seal portion 12 to the upper side 4 is 5 mm or more and 15 mm or less,
Better effects were obtained for both grip and opening properties.

As described above, according to the present invention, deformation such as curling of the gripping portion as a non-sealing portion is prevented, and there is no problem of contamination of the contents due to the film being caught by the curling and tearing of the film, and gripping at the time of opening. It is possible to provide an easy-open packaging bag in which the grip performance of the part is improved and which does not require labor in manufacturing. The easy-to-open packaging bag according to the present invention is mainly intended to be a packaging bag in which medical instruments, medicines, etc. are stored in a sterilized state. There is a need to be able to open packaging bags faster and easier in the field.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the meaning and range of equivalents of the scope of the claims.

For example, as long as the shape of each sheet constituting the easy-open packaging bag is rectangular, it does not have to be a vertically long rectangle, but may be, for example, a horizontally long rectangle or a square. Moreover, the shape of the convex seal portion 12 may be a rounded shape instead of the curved portion as shown in FIG.

In addition, the present invention shows a four-side seal bag formed by thermally bonding two sheets, but it is also possible to apply and use a three-side seal bag in which synthetic resin sheets are folded together. Alternatively, a gusset bag having gussets on the sides or bottom may be used.

Reference Signs List 1 Easy-open packaging bag 2 Synthetic resin sheet 3 Breathable sheet 4 Upper side 5 Unsealed portion 6 Left side 7 Left sealed portion 8 Right side 9 Right side seal portion 10 Lower side 11 Lower seal portion 12 Convex seal portion 13 Storage portion 14 Contents 15 Heat treatment portion 16 . . . Extension portion 20 .. Easy-open packaging bag (conventional example)

Claims (4)

An easy-open packaging bag formed by overlapping the inner surfaces of two rectangular synthetic resin sheets or the inner surfaces of a rectangular synthetic resin sheet and a rectangular breathable sheet facing each other,
a non-sealed portion provided along the upper side, a left side sealed portion provided along the left side, a right side sealed portion provided along the right side, and a lower sealed portion provided along the lower side;
a convex seal portion that connects the left seal portion and the right seal portion at the ends on the upper sides thereof and protrudes toward the non-seal portion;
has
the convex seal portion, the left seal portion, and the right seal portion are adhered to each other so as to be peelable,
A heat-treated portion having a coefficient of static friction of 0.20 or more is provided on the inner surface of the synthetic resin sheet in the non-sealed portion.
An easy-open packaging bag characterized by: Either one of the two superimposed synthetic resin sheets, or either one of the superimposed synthetic resin sheet and the air-permeable sheet has an outwardly extending portion, The easy-open packaging bag according to claim 1, characterized in that: The imaginary vertical line from the bent portion of the convex seal portion to the upper side of the easy-open packaging bag is 5 mm or more and 15 mm or less, according to claim 1 or 2. Easy-open packaging bag. In an easy-open packaging bag in which the inner surfaces of the synthetic resin sheet and the air-permeable sheet are placed facing each other, the air-permeable sheet is made of sterilized paper or non-woven fabric, and the surface of the air-permeable sheet is adhered to the synthetic resin sheet. 4. The easy-open packaging bag according to any one of claims 1 to 3, characterized by having a heat-seal layer on the inside.

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