JP2020172288A - Packaging bag - Google Patents

Abstract

To provide a packaging bag which can be easily opened and which can be separated by a tearing line even in the case where the directions of the tearing lines are not completely matched on the front side and the rear side of a body part of the packaging bag in opening and a deviation occurs, in the packaging bag which includes an automatic steam vent mechanism and which can be heated and cooked in a microwave oven.SOLUTION: Part of a seal part of any one side of a peripheral edge part is an overhanging seal part having a shape curved and overhanging in the inside direction of a packaging bag. The overhanging seal part is an automatic vent mechanism in heating cooking, and at the seal part of another side opposing to the seal part of this side, at the position opposing to the overhanging seal part, a cut line is provided.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging bag. In particular, it is a packaging bag made of a laminate based on a plastic film. In this packaging bag, even when the tear lines of the front and back laminates are misaligned between the front side body and the back side body when tearing for opening, the tear lines do not stop at the seals on the opposite sides and tear. It relates to a packaging bag that can be easily opened and separated.

Further, the packaging bag according to the present invention can be used for cooking by a microwave oven, has an automatic steam removal mechanism that automatically discharges steam generated by heating to the outside, and is a hand after cooking. It relates to a packaging bag that can be easily opened by tearing using.

Packaging bags, which are a type of packaging material, are widely used as single or laminated bodies based on a plastic film, and various forms are used for a wide range of purposes in modern life. It has become indispensable for.

For example, it is also used as a liquid container and is widely used in the food field such as retort pouch foods as well as beverages, and in the field of daily necessities and toiletries, various products are crowded with the product shelves of supermarkets, drug stores and convenience stores. .. In addition to liquid containers, various applications have been developed.

The advantages of packaging bags are that they are cheaper than containers such as cans and bottles, that they can be handled with detailed material design depending on the required quality, and that they are lightweight and space-saving even before filling the contents and in distribution and storage. Can be mentioned. In addition, packaging bags can be said to be environmentally friendly from the viewpoint of reducing waste.

In addition, high-definition printing on the layer that can be seen from the surface can improve the image of the product, it is possible to display necessary information about the contents, and printing of barcodes is the distribution and marketing of the product. It is also a source of information.

Some of the packaging bags are self-supporting, those that can be cooked in a microwave oven, and those that have improved storage stability, and are continuing to evolve in terms of functionality.

For example, in cooking with a microwave oven, from the viewpoint of consumer convenience, steam generated inside the packaging bag due to cooking causes a rapid increase in internal pressure, so it has some kind of steam removal mechanism. It is preferable to have.

Furthermore, when opening the packaging bag after cooking by tearing it with fingers, it is important to prevent burns due to residual steam, to make the opening easy to open, and to maintain the shape of the opening. Has been done.

Patent Document 1 proposes a packaging bag provided with a vapor bleeding mechanism for improving the ease of tearing and opening, but a tearable polyester resin film is used to prevent the direction of the tear line. This is a proposal to improve accuracy.

However, in addition to the possibility of limiting the degree of freedom of selection in terms of materials, it does not necessarily guarantee that the directions of the tear lines on the front and back of the body match. Further, when the tear reaches the opposite side, it hits the seal portion, so that the tear in this portion and the separation of the packaging bag are not always easy.

JP 2015-196512

The present invention has been made in view of such a situation, and in a packaging bag having an automatic steam venting mechanism and capable of cooking in a microwave oven, a tear line at the time of opening is the front and back of the body of the packaging bag. It is an object of the present invention to provide a packaging bag that can be easily opened and separated by a tear line even when the directions do not completely match and a deviation occurs.

The invention according to claim 1 is a means for solving the above problems.
A packaging bag that has an automatic steam removal mechanism and can be cooked in a microwave oven.
A packaging bag made by stacking laminates having at least a sealant layer on a plastic film as a base material with the sealant layers facing each other and sealing the peripheral edge of the packaging bag.
A part of the seal portion on any one side of the peripheral portion is an overhang seal portion having a shape that is curved and overhangs inward of the packaging bag.
The overhanging seal portion is an automatic steam venting mechanism during cooking.
The packaging bag is characterized in that a notch is provided at a position facing the overhanging seal portion in the seal portion on the other side facing the seal portion on any one side.

Further, the invention according to claim 2 is
The packaging bag according to claim 1, wherein the laminated body further includes a plastic film layer having a straight-line cut property in the direction from the notch to the overhanging seal portion.

Further, the invention according to claim 3 is
The packaging bag according to claim 1 or 2, wherein the laminated body further contains a gas barrier film layer in which an inorganic compound is formed into a film by vapor deposition on the surface of a plastic film.

According to the present invention, in a packaging bag having an automatic steam venting mechanism and capable of cooking in a microwave oven, the tear lines at the time of opening do not completely match the directions on the front and back of the body of the packaging bag, resulting in misalignment. Even if it does occur, it is possible to provide a packaging bag that can be easily opened and separated by a tear line.

This is because, in the present invention, the automatic steam venting mechanism is an overhanging seal portion having a shape in which a part of the sealing portion on any one side of the peripheral portion of the packaging bag is curved inward of the packaging bag and overhangs. This is a mechanism in which the internal pressure rises due to the generation of water vapor during cooking in a microwave oven of the packaging bag, the seal of the overhanging seal is peeled off, and the water vapor inside is discharged to the outside.

In addition, when the packaging bag is opened and the opening is to be secured by tearing and separating after the cooking is completed, the tearing line reaches the peeled portion of the seal portion, and the tearing and separation are performed. It has the effect of making it easier. That is, the peeled portion of the seal portion is due to the fact that the laminated bodies of the front and back body portions are not doubly overlapped and can be easily torn by tearing.

Further, as described above, the tearing of the packaging bag starts from the notch because the notch is provided at the position facing the overhanging seal portion in the seal portion on one side facing the seal portion on one side. By starting the tearing, the tear line on the overhanging seal portion facing the front and back body has an effect of making it possible to reach the peeled portion of the seal portion even when a slight deviation occurs.

Further, in particular, according to the invention of claim 2, the laminated body further contains a plastic film layer having a straight-line cut property in the direction from the notch to the overhanging seal portion, so that the straight-line cut property can be further improved. It is possible to make a packaging bag that does not interfere with opening.

That is, since the seal portion on one side of the peripheral portion is provided with a shi-overhang seal portion having a shape that is curved and overhangs inward of the packaging bag as an automatic steam venting mechanism during cooking. If the cut lines on the front and back sides from the notch facing the surface are within a certain range, it can be cut without leaving any uncut lines, and the opening and separation of the packaging bag can be made easy and reliable.

Further, in particular, according to the invention of claim 3, the laminate further includes a gas barrier film layer in which an inorganic compound is formed into a film by vapor deposition on the surface of the plastic film, thereby improving the storage stability of the contents. It is possible to enhance and avoid changes such as alteration of the contents due to the environment.

Further, when such a gas barrier film layer is used, unlike the gas barrier layer using a metal foil or the like, sparks are not generated and the cooking by the microwave oven is not hindered.

FIG. 1 is a planar drawing for explaining the overall shape and the positional relationship between the notch and the overhanging seal portion in one embodiment of the packaging bag according to the present invention. FIG. 2 is a planar drawing for explaining how the automatic steam bleeding mechanism works in one embodiment of the packaging bag according to the present invention when cooking in a microwave oven. FIG. 3 is a planar drawing for explaining a state in which, in one embodiment, the packaging bag according to the present invention is torn and opened after cooking in a microwave oven. FIG. 4 is a planar drawing for explaining, in one embodiment, of the packaging bag according to the present invention, in which the packaging bag is cut and opened after being cooked in a microwave oven, and then the packaging bag is separated. FIG. 5 is a schematic partial cross-sectional view for explaining one embodiment of the laminate constituting the packaging bag according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 to 5. However, the present invention is not limited to the examples shown here. The present invention is limited by the claims.

FIG. 1 is a planar drawing for explaining the overall shape and the positional relationship between the notch and the overhanging seal portion in one embodiment of the packaging bag according to the present invention.

The present invention relates to a packaging bag (100) having an automatic steam venting mechanism and capable of cooking in a microwave oven. The example shown in FIG. 1 is a plan view seen from the front side body portion (17) side.

The packaging bag (100) is a packaging bag made by stacking laminates having at least a sealant layer on a plastic film as a base material so that the sealant layers face each other and seal the peripheral edge of the packaging bag (100). In the example shown in FIG. 1, the peripheral portion on each side of (100) is sealed and the bag is made into a substantially rectangular packaging bag (100).

The automatic steam bleeding mechanism is based on an overhanging seal portion (3) having a shape that is curved and overhangs inward of the packaging bag (100) at a part of the sealing portion on any one side of the peripheral portion. In the example of the substantially rectangular packaging bag shown, the overhanging seal portion (3) is provided in the central portion of the seal portion (2) on the right side.

This overhanging seal portion (3) is an automatic steam bleeding mechanism in cooking by a microwave oven, and steam is generated inside by heating, and the packaging bag expands due to the volume expansion, and at the same time, the internal pressure rises. , It is a mechanism to release water vapor from this part to the outside of the packaging bag.

Therefore, this overhanging seal portion (3) can be sealed with a weaker seal strength or a narrower seal width than the other seal portions, and when the internal pressure rises, the seal of this portion is destroyed and the body portion. The seals of the front and back laminates constituting the above are peeled off, the inside and the outside of the packaging bag (100) are connected at a peeled portion, and steam is removed from this portion.

The weakening of the seal strength does not impose any particular restrictions on the means and methods. For example, a state in which the seal strength is weaker than other seal parts can be realized by adjusting the seal conditions or inserting a layer effective for weakening into this part at the time of sealing. Is.

Further, the state in which the seal width is narrower than that of the other seal portions can be realized by adjusting the shape and width of the seal bar.

That is, this overhanging seal portion (3) is sealed with a weaker seal strength, a narrower seal width, or both as compared with other seal portions, so that automatic steam is used in cooking by a microwave oven. Its feature is that it is effective as a punching mechanism.

Further, in the present invention, a notch is provided at a position facing the overhanging seal portion in the sealing portion on one side and facing the sealing portion on one side, which is provided with the overhanging seal portion. FIG. In the example shown in (1), a notch (4) is provided in the central portion of the seal portion (1) on the left side facing the overhanging seal portion (3) provided on the seal portion (2) on the right side.

In this positional relationship, when the packaging bag (100) is torn by fingers to open it, the notch (4) is used as the starting point to make the tear, and the tear reaches the overhanging seal portion (3) to further open the packaging bag (3). The packaging bag (100) is intended to be separated by cutting up to the right end (9) of the body of 100), and the complete separation hinders the removal of the contents from the opening. It is intended to prevent it from appearing.

Further, the notch (4) is provided in the central portion of the seal portion (1) on the left side, but the seal portion is doubled by sealing the laminated body on the front and back sides, and is robust against tearing. However, since the notch (4) is provided, it effectively acts as a trigger for easy tearing.

FIG. 2 is a planar drawing for explaining how the automatic steam bleeding mechanism works in one embodiment of the packaging bag according to the present invention when cooking in a microwave oven.

Therefore, this packaging bag (100) can be used for cooking foods, for example, and the water contained in the food contents is cooked by a high frequency of a microwave oven and used for food. The steam generated during cooking is discharged to the outside of the packaging bag (100) by an automatic steam bleeding mechanism due to an increase in the internal pressure generated by itself after a certain amount of steam is generated.

That is, in the examples shown in FIGS. 1 and 2, when cooking in a microwave oven, steam from the contents is generated inside the packaging bag (100) by heating, and the packaging bag (100) expands due to its volume expansion. At the same time, the internal pressure rises.

At this time, the volume expansion occurs three-dimensionally radially from the volume center (8) of the internal space of the packaging bag (100), and in the example shown in FIG. 2, eight from the volume center (8). Indicated by the arrow. Due to this volume expansion, pressure is applied to the overhanging seal portion (3), particularly to the sealing portion in the vertical direction in FIG. 2, and acts as a peeling force on the front and back laminated bodies.

For example, in the example shown in FIG. 2, the peripheral portion of the packaging bag is sealed, and even if volume expansion occurs due to water vapor, the substantially rectangular shape shown in FIG. 2 becomes three-dimensional while the internal pressure is low. It is possible to transform into an inflated shape.

However, this radial three-dimensional volume expansion tends to further expand into a spherical shape, which results in a discrepancy with the room for expansion of the packaging bag.

At this time, since the overhang-seal portion (3) has a curved shape toward the inside of the packaging bag (100), the position is closer to the volume center (8), and therefore, due to three-dimensional radial volume expansion, In the example shown in FIG. 2, in order to receive a stronger pressure to be peeled off in the front-rear direction toward FIG. 2, stress concentration becomes more intense in this portion, and the seal portion of the overhang-seal portion (3) becomes more intense. It will cause peeling.

Further, in FIG. 2, this portion is shown as a peeling portion (5), and the inside and the outside of the packaging bag (100) are connected by the peeling portion (5) by peeling to automatically remove steam. It becomes a mechanism. Of the eight arrows in FIG. 2, steam is evacuated in the direction of one colored arrow, and steam (40) is ejected from the peeled portion (5) of the overhanging seal portion (3) to the outside.

That is, since this portion becomes an automatic steam bleeding mechanism, the internal pressure of the packaging bag (100) is sharply reduced, and such peeling occurs at the other peripheral sealing portion of the packaging bag (100). It does not occur.

Further, in the present invention, the overhanging seal portion (3) is sealed with a weaker seal strength, a narrower seal width, or both, as compared with the seal portion of the other peripheral edge portion. Therefore, the breakage and peeling of the seal portion due to the volume expansion will occur more stably in the overhanging seal portion (3), so that a stable and reliable automatic steam bleeding mechanism can be obtained.

FIG. 3 is a planar drawing for explaining a state in which, in one embodiment, the packaging bag according to the present invention is torn and opened after cooking in a microwave oven.
One of the features of the present invention is that a notch is provided at a position facing the overhanging seal portion in the sealing portion on one side facing the sealing portion on one side of the overhanging sealing portion.

That is, in the example shown in FIG. 3, the overhanging seal portion (3) is provided in the central portion of the seal portion (2) on the right side, and the seal portion (1) on the left side has a notch (4). As a result, the opening operation can be started more easily by using this notch (4) as a trigger.

The notch (4) may be provided in a V shape as shown in FIG. 3, and may be simply a notch in the seal portion as long as it triggers a tear at the time of opening. If necessary, the position of this notch may be indicated on the outer surface of the body of the packaging bag so that the position can be easily visually recognized from the outside of the packaging bag.

Subsequently, the body of the packaging bag (100) can be torn by fingers toward the overhanging seal (3) at a position facing the notch (4). The tearing is performed on both the front body (17) and the rear body (18).

At this time, in the front and back laminated bodies, the tear line (6) on the front side body portion and the tear line (7) on the rear side body portion do not always completely match, and a slight deviation may occur. In the example shown in FIG. 3, this is indicated by the deviation (b) of the tear line.

Further, as described above in the description of the example shown in FIG. 2, the overhanging seal portion (3) has the seal portion as an automatic steam venting mechanism, and the seal portion is peeled off to become the peeled portion (5). The vertical width of the above is the vertical width (a) of the overhanging portion in FIG.

That is, as shown in the example shown in FIG.
Vertical width of the overhanging seal (a)> Misalignment of the tear line (b)
Within the range of, both of the two tear lines reach the peeled portion (5) of the overhanging seal portion (3), and the tear can be easily advanced.

In fact, the ripping is a work in which the notch (4) is provided at a position facing the overhanging seal portion (3) and the ripping is started toward the peeling portion (5) of the overhanging seal portion (3). Reaching the peeled portion (5) of the seal portion (3) is easy in a normal tearing operation.

That is, both the cut lines of the front side body portion (17) and the rear side body portion (18) reach the peeled portion (5) of the overhanging seal portion (3) and further reach the right end portion (9) of the body portion. By reaching, the packaging bag (100) can be easily separated by tearing with fingers.

The portion from the peeled portion (5) of the overhanging seal portion (3) to the right end portion (9) of the body portion is outside the packaging bag (100) when viewed from the overhanging seal portion (3). Is not sealed, the front and back laminates are separate, and it is not a double-sealed part, so it is easy to tear.

For example, when the positional relationship between the notch (4) and the overhanging seal portion (3) does not correspond to the facing positional relationship defined by the present invention, the tip of the tear line reaches the seal portion (2) on the right side directly. In some cases, this portion is sealed against the sealant of the laminate and the laminate is doubled, which makes it difficult to cut this portion by tearing with fingers.

FIG. 4 is a planar drawing for explaining, in one embodiment, of the packaging bag according to the present invention, in which the packaging bag is cut and opened after being cooked in a microwave oven, and then the packaging bag is separated.

As described in the explanations of FIGS. 1 to 3, automatic steam removal is performed at the overhanging seal portion (3) of the packaging bag (100) by cooking the contents of the packaging bag (100) with a microwave oven. Then, starting from the incision (4), the incision is performed by the fingers.

As a result, the packaging bag (100) according to the present invention can be easily separated into upper and lower parts as shown in FIG. In the example shown in FIG. 4, the vertical separation is represented by an arrow in the vertical direction in FIG.

In the example shown in FIG. 4, the tear line (6) at the same portion on the front side and the tear line (7) on the rear body portion are respectively overhanging seal portions (4) from the notch (4), although the tear lines are displaced. It reaches the right end portion (9) of the body portion through the peeled portion (5) of 3).

By easily separating the packaging bag (100) in this way, the effect of facilitating the handling of the cooked packaging bag (100) and its contents and the removal of the contents can be obtained.

For example, when a part remains continuously and the packaging bag (100) is not separated into two, it is difficult to secure the opening, and the contents can be taken out or the packaging bag (100) itself can be handled. This is because it may cause difficulties.

FIG. 5 is a schematic partial cross-sectional view for explaining one embodiment of the laminate constituting the packaging bag according to the present invention.

As described above, the present invention is a packaging bag having an automatic steam bleeding mechanism and capable of cooking by heating in a microwave oven. The packaging bag (100) uses a plastic film as a base material and at least a sealant layer. The packaging bag (100) is made by stacking the laminated bodies having the same layers with the sealant layers facing each other and sealing the peripheral edge of the packaging bag.

In the example shown in FIG. 5, the laminate (30) has a sealant layer (15) on the plastic film base material layer (11). In addition, the laminate (30) may include other layers, if desired.

For example, in the present invention, the laminate constituting the packaging bag (100) further includes a plastic film layer (10) having a straight cut property in the direction from the notch (4) to the overhanging seal portion (3). Can be done.

As the plastic film layer (10) having the linear cut property, for example, one that constitutes a plastic film and utilizes the orientation of molecules can be used. The orientation of the molecules can be achieved, for example, by stretching the film in one direction.

In such a case, since the straight cutability of the ripping line is further improved, the deviation (b) of the ripping line on the front and back becomes smaller, and there is a possibility that the ripping line deviates from the vertical width (a) of the overhanging portion. It will be even smaller.

Further, in the present invention, the laminate constituting the packaging bag (100) further contains a gas barrier film (20) in which an inorganic compound layer (13) is formed by vapor deposition on the surface of the plastic film (14). Can be done.

This is because when a metal foil such as an aluminum foil is used as the gas barrier layer, problems such as sparks are generated during cooking in a microwave oven, whereas the gas barrier film (20) has a gas barrier property. It is possible to avoid the danger of sparks without compromising.

The plastic film used for each layer of the laminate (30) is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), Polyethylene (nylon-6, nylon-66, etc.), polyimide, etc. can be used and are appropriately selected according to the application.

In particular, when polypropylene or polyethylene terephthalate is used as a plastic film, it is more preferable in terms of film strength and price. In addition, when a stretched polyamide film is used, it is possible to impart toughness against piercing and impact resistance to the laminated body.

Further, the plastic film can be laminated with another layer via the adhesive layer (12) to form a laminated body (30). The layer structure, material structure, thickness, etc. of the laminate (30) can be appropriately designed according to the required quality for the packaging bag (100).

Further, for example, for the purpose of improving the storage stability of the contents, an opaque layer such as a colored film that shields ultraviolet rays can be provided in the laminate (30) constituting the packaging bag (100).

Alternatively, as described above, the gas barrier layer can be provided in the laminated body (30). For example, a gas barrier film (20) having a gas barrier layer provided on the surface of the plastic film can be used.

A metal foil such as aluminum or a plastic film having a metal vapor deposition film on the surface is also effective as a gas barrier layer, but as described above, cooking in a microwave oven causes sparks due to high frequencies. Inappropriate for.

In the case of the gas barrier film (20), the plastic film used is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.). ), Polyethylene (Nylon-6, Nylon-66, etc.), Polyethylene and the like can be used, and are appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as a plastic film base material, it is more preferable in terms of film strength and price.

In the case of the gas barrier film (20), the gas barrier layer can be composed of an inorganic compound vapor deposition layer (13) and a coating layer, and after providing an anchor coat on the plastic film, the vapor deposition layer and the coating layer are sequentially provided.

For example, urethane acrylate can be used for the anchor coat layer of the gas barrier film. For the formation of the anchor coat layer, a coating method in which a coating material in which a resin is dissolved in a solvent is applied by a printing method such as gravure coating can be used, or a coating film can be formed by using a generally known coating method.

As a method for forming the thin-film deposition layer, an inorganic compound such as SiO or AlO is coated on a plastic film provided with an anchor coat layer by a vacuum vapor deposition method to form an inorganic compound vapor deposition layer (13) by the vacuum vapor deposition method. can do. Incidentally, the thickness of the thin-film deposition layer is preferably 15 nm to 30 nm.

As a method for forming the coating layer, an aqueous solution or water / alcohol containing at least one of a water-soluble polymer, (a) one or more alkoxides or hydrolysates thereof, or both, or (b) tin chloride. A coating agent containing a mixed aqueous solution as a main component can be applied onto a film and dried by heating to form an inorganic compound layer by a coating method to form a coating layer. At this time, by adding a silane monomer to the coating agent, it is possible to improve the adhesion with the anchor coat layer.

The inorganic compound layer vapor deposition (13) has a gas barrier property only by the coating film by the vacuum vapor deposition method, but the coating layer which is the inorganic compound layer by the coating method is formed by superimposing the coating layer which is the inorganic compound layer by the vacuum vapor deposition method on the vapor deposition layer. It can be a gas barrier layer.

By combining these two layers, a reaction layer of both layers is formed at the interface between the inorganic compound layer by the vacuum vapor deposition method and the inorganic compound layer by the coating method, or the inorganic compound layer by the coating method becomes an inorganic compound layer by the vacuum vapor deposition method. A dense structure is formed by filling and reinforcing defects or micropores such as pinholes, cracks, and grain boundaries that occur.

Therefore, the gas barrier film (20) has higher gas barrier properties, moisture resistance, and water resistance, and has flexibility to withstand deformation due to an external force, so that it can be suitable as a packaging material.

Further, when SiO is used as the gas barrier layer, for example, the coating film is transparent, so that the contents can be visually seen from the outside of the packaging bag. These may be used properly according to the application and the required quality.

The sealant layer (15) is formed by stacking two laminates so that the sealant layers (15) face each other, heating and pressurizing the sealant layers (15) so as to adhere to each other by heat-sealing, and forming the sealant layer (15) into a packaging bag (100). Allows you to.

As the material of the sealant layer (15), polyolefin-based resins are generally used among thermoplastic resins, and specifically, low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), and linear low density resin. Ethylene-based resins such as density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, ethylene-methacrylic acid resin copolymer, polyethylene-polybutene blended resin, and Polypropylene-based resins such as homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer can be used.

To form the sealant layer (15), a molten resin can be formed by using an extruder or the like to form a layer on the laminated body (30). Alternatively, it is also possible to form the sealant layer (15) on the surface of the laminated body (30) by laminating the material which has been formed into a film in advance by laminating.

If necessary, printing ink is applied to the layer visible from the outside of the packaging bag in the laminate based on the plastic film for the purpose of improving the image as a product, displaying necessary information about the contents, and improving the design. A layer (16) can be provided. The printing ink layer (16) may be provided on the outermost layer of the packaging bag (100), that is, the laminate (30).

Further, the printing ink layer (16) may be provided on a part of the packaging bag (100), or may be provided over the entire surface of the packaging bag (100). Alternatively, as a method of providing the display unit without using the printing ink layer (16), for example, a printed sticker can be attached to the surface of the packaging bag (100).

Here, the printing method and the printing ink are not particularly restricted, but from among the known printing methods, printability on a plastic film, design such as color tone, adhesion, or as a food container. It may be appropriately selected in consideration of safety and the like.

For example, it can be selected from known printing methods such as a gravure printing method, an offset printing method, a gravure offset printing method, a flexo printing method, a silk screen printing method, and an inkjet printing method. Among them, the gravure printing method can be preferably used in terms of productivity, printability on a plastic film, and high definition of a pattern.

As described above, according to the present invention, a part of the seal portion on any one side of the peripheral edge portion of the packaging bag is an overhang seal portion having a shape that is curved and overhangs toward the inside of the packaging bag. Is an automatic steam venting mechanism during cooking, and this overhanging seal part is sealed with a weaker seal strength, a narrower seal width, or both, compared to other seal parts. A packaging bag that has an automatic steam bleeding mechanism and can be cooked in a microwave oven by providing a notch at a position facing the overhanging seal portion on the other side of the seal portion facing the seal portion of the above. In the case where the tear lines at the time of opening do not completely match the directions on the front and back of the body of the packaging bag and a deviation occurs, it is possible to provide a packaging bag that can be easily opened and separated by the tear line. Is.

1 ... Sealing part on the left side 2 ... Sealing part on the right side 3 ... Overhanging sealing part 4 ... Notch 5 ... Peeling part 6 ... Tearing line 7 ... Rupture line 8 on the back side of the body 8 ... Volume center 9 ... Right end of the body 10 ... Plastic film layer 11 with straight-line cutability ... Plastic film base material layer 12 ... Adhesive layer 13 ... Inorganic compound vapor deposition layer 14 ... Plastic film 15 ... Sealant layer 16 ... Printing ink layer 17 ... Front body 18 ... Rear body 20 ... Gas barrier film 30.・ ・ Laminated body 40 ・ ・ ・ Steam 100 ・ ・ ・ Packaging bag a ・ ・ ・ Vertical width b of overhanging seal part ・ ・ ・ Shift of tear line

Claims (3)

A packaging bag that has an automatic steam removal mechanism and can be cooked in a microwave oven.
A packaging bag made by stacking laminates having at least a sealant layer on a plastic film as a base material with the sealant layers facing each other and sealing the peripheral edge of the packaging bag.
A part of the seal portion on any one side of the peripheral portion is an overhang seal portion having a shape that is curved and overhangs inward of the packaging bag.
The overhanging seal portion is an automatic steam venting mechanism during cooking.
A packaging bag characterized in that a notch is provided at a position facing the overhanging seal portion in the seal portion on the other side facing the seal portion on any one side. The packaging bag according to claim 1, wherein the laminated body further includes a plastic film layer having a straight-line cut property in the direction from the notch to the overhanging seal portion. The packaging bag according to claim 1 or 2, wherein the laminated body further contains a gas barrier film layer in which an inorganic compound is formed into a film by vapor deposition on the surface of a plastic film.

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