JP2009067446A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag which is safely heated by a microwave oven after it is unsealed once and a food material or the like is fed thereinto. <P>SOLUTION: The packaging bag is formed by integrally joining the four ends of a front face member 6 and a back face member 4, and has an unsealing part 2 for opening and a second zipper member 11 for engaging with a first zipper member 9 and openingly/closingly resealing an opening at the inner face of the front face member 6. The packaging bag is provided with a resealing part 7 having the upper end joined to the upper side of the unsealing part 2 of the inner face of the front face member 6 over a width direction and a ventilation hole 15 between the joining part of the resealing part 7 and the second zipper member 11. The unsealing part 2 is formed to be projected from the outer face side of the front face member 6 by integrally joining two or more folding parts 2A, 2A which are made of the partially folded front face member 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a packaging bag for introducing food into the inside and cooking with a microwave oven together with a pre-filled seasoning liquid or the like.

  2. Description of the Related Art Conventionally, so-called retort foods in which foods (for example, foods that have been cooked or semi-cooked) in a packaging bag are heated and pressurized in a retort kettle have been widely distributed and used. Since these retort foods are sealed by a packaging bag, if the microwave oven is heated as it is, the pressure inside the bag rises due to water vapor generated from the contents with heating, and the bag expands and bursts. As a result, the contents may be scattered, and the inside of the microwave oven may be soiled or the human body may be injured such as a burn.

  For this reason, before setting such a packaging bag in a microwave oven, the bag is partially opened in advance, a hole is made in the bag body, or the end of the bag is cut off. Thus, a method is adopted in which water vapor or the like generated in the bag is discharged to the outside to prevent the bag from being broken.

  However, such a method is generally time-consuming, and steam generated when heating is started is immediately discharged out of the bag. Especially in the case of food, the steaming effect of steam is reduced, and the taste is reduced. Has the disadvantage of falling.

  Therefore, in order to solve this problem, a packaging bag has been proposed in which a heat-resistant non-woven fabric for escaping the above-mentioned water vapor is folded in half and attached inside one of the packaging bags. (For example, refer to Patent Document 1).

  When heating retort food using this packaging bag in a microwave oven, cut off the end side where the nonwoven fabric is attached, open the end on the nonwoven fabric side, and then heat the food in the microwave oven together with the packaging bag To do.

Prior art documents are shown below.
Japanese Patent Laid-Open No. 8-80978

  However, since the open end of the packaging bag of Patent Document 1 is covered with a nonwoven fabric or the like, after opening the packaging bag of retort food filled with sauce or seasoning liquid and adding ingredients, Sauces and ingredients cannot be heated together in a range.

  Therefore, if a well-known zipper that can be freely opened and closed is provided in the opening, it becomes possible to inject food and seal the packaging bag again, but the opening with the zipper closed is poorly breathable and heated in a microwave oven. In doing so, the risk of rupture is a problem.

  Moreover, the nonwoven fabric etc. of the packaging bag of patent document 1 are being fixed to the front surface and back surface of a packaging bag. Therefore, as a manufacturing process, it is necessary to secure a filling port by fixing non-woven fabric or the like only on one side of the packaging bag and to fix the other side after filling the contents. For this reason, there exists a problem that a process becomes complicated.

  An object of the present invention is to provide a packaging bag that can be safely heated in a microwave oven after being opened and filled with foods, etc. And

  The present invention has been made to solve the above-described problems, and the invention according to claim 1 of the present invention is such that the four end portions of the front member (6) and the back member (4) are joined together. An opening portion (2) for forming an opening (14) in the packaging bag, provided at a position intermediate between the upper end and the lower end of the front member (6), A first zipper member (9) provided on the inner surface of the front member (6) and a second zipper member (11) that engages with the first zipper member (9) and reseals the opening (14) so as to be freely opened and closed. ), And an upper end of the inner surface of the front member (6) is joined to the upper side of the opening portion (2) across the width direction, and the resealing portion (7) A vent hole (15) is provided between the joint portion of the second zipper member (11) and the unsealing portion (2). Two or more bent portions (2A, 2A) in which a part of the material (6) is bent are integrally joined to be formed to protrude to the outer surface side of the front member (6). A characteristic packaging bag.

  The invention according to claim 2 of the present invention is the packaging bag according to claim 1, wherein the bag is folded back and forth, the front end is joined to the lower end of the front member (6), and the rear end is the lower end of the back member (4). It is a packaging bag further provided with the bottom face member (5) joined to.

  The packaging bag according to the present invention is a packaging bag formed by integrally joining the four end portions of the front member and the back member, and is provided at a position intermediate between the upper end and the lower end of the front member. An opening for forming an opening in the bag; a first zipper member provided on an inner surface of the front member; and a second zipper member that engages with the first zipper member and reseals the opening so as to be freely opened and closed. A reseal portion whose upper end is joined across the width direction on the inner surface of the front member, and between the joint portion of the reseal portion and the second zipper member. The opening portion is provided with two or more bent portions in which a part of the front member is bent, so that the opening portion is opened once, and foods and the like are inserted safely. Can be heated in the range.

  According to such a packaging bag, in addition, since the opening portion is integrally joined with a plurality of bent portions formed by folding the front member, the thickness of the upper and lower one-layer structure front members is the same. Due to the difference in height, the interface between the unsealed portion and the front member is easily torn without requiring a large force. Therefore, it is possible to configure a packaging bag that can be opened smoothly with a simple structure without providing special processing such as providing a ruled line in the opening portion or disposing another member for cutting.

  In addition, since the front member is formed of a single sheet-like main body film including the unsealed portion, the number of parts is small, and the packaging bag can be configured with a simple structure at a low cost.

  Moreover, after opening once and throwing in foodstuffs etc., the 2nd zipper member of a reseal part and the 1st zipper member of a front-surface part can be reengaged, and it can heat safely with a microwave oven.

  Moreover, when it installs in a microwave oven and heats, a foodstuff is cooked with a seasoning liquid. At this time, an amount of water vapor exceeding the volume of the packaging bag is appropriately diffused to the outside from the vent hole formed in the reseal portion, and rupture is prevented. Therefore, the contents do not scatter and there is no risk of polluting the inside of the microwave oven or causing harm such as a burn to the human body.

Furthermore, the bottom member bent back and forth rises with the generation of water vapor due to cooking, and a steaming space is formed. Therefore, uniform heating is performed inside the packaging bag, and heat cooking can be performed satisfactorily.

  Embodiments of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a perspective view showing an embodiment of a packaging bag according to the present invention, FIG. 2 is a perspective view showing a state where an opening portion of the packaging bag according to the present invention is opened, and FIG. 3 is according to the present invention. FIG. 4 is a side sectional view showing an embodiment of a packaging bag, FIG. 4 is a side sectional view showing a state in which the packaging bag according to the present invention is filled with contents, and FIG. 5 is an opening of the packaging bag according to the present invention. FIG. 6 is a side sectional view showing a state in which the opening of the packaging bag according to the present invention is opened, and FIG. 7 is a state in which ingredients are put into the packaging bag according to the present invention. FIG. 8 is a side sectional view showing a state in which food is put into the packaging bag according to the present invention and then resealed, and FIG. 9 shows a state during cooking of the packaging bag according to the present invention. FIG. 10 is a side cross-sectional view, and FIG. 10 is a side cross-sectional view showing one embodiment of the layer structure of the laminate constituting the packaging bag according to the present invention. Other embodiments of the layer structure of the laminate constituting the packaging bag according to the present invention is a side sectional view showing.

  A packaging bag (1) according to an embodiment of the present invention is a packaging bag formed by integrally joining the four end portions of a front member (6) and a back member (4), the front member ( 6) an opening portion (2) for forming an opening (14) in the packaging bag, and a first zipper member provided on the inner surface of the front member (6). (9) and a second zipper member (11) that engages with the first zipper member (9) to reseal the opening (14) so that the opening (14) can be freely opened and closed, and an upper end of the front zipper member (6) A reseal portion (7) joined across the width direction on the inner side of the unsealed portion (2), and between the joined portion of the reseal portion (7) and the second zipper member (11) Are provided with a vent hole (15), and the opening portion (2) has two or more bent portions in which a part of the front member (6) is bent. 2A, 2A) are packaging bag characterized by being formed to protrude on the outer surface side of the by being joined together, the front member (6).

  As shown in FIG. 1, the front surface portion (3) and the back surface member (4) are formed by integrally joining left and right and upper end portions, and the lower end is a bottom surface member (5) as will be described later. It is joined integrally through. In the following description, expressions such as front, rear, left, and right are based on a state where the front surface portion (3) is the front surface and the bottom surface member (5) is the lower surface, as shown in FIG.

  As shown in FIG. 3, the front surface portion (3) has a front surface member (6) that forms the outer surface of the packaging bag (1) and a surface (hereinafter referred to as “the back surface member (4)) of the front surface member (6). And a reseal portion (7) that reseals an opening, which will be described later, in an openable and closable manner. The front member (6) is formed of a sheet-like flexible film (hereinafter referred to as “main body film”) having heat-fusibility.

  The front member (6) is bent over the width direction so as to protrude outside the packaging bag (1) at an arbitrary intermediate position between the upper end and the lower end, and the bent portions (2A) are formed at two locations. Has been. Each bending part (2A) is integrally joined by means, such as heat sealing | fusion, and protrudes on an outer surface as an opening part (2).

  As shown in FIG. 1, easy-opening processing portions (8) are provided at the left and right ends in the width direction of the opening portion (2) to trigger tearing of the opening portion (2). The easy-open processing part (8) may be provided at either one of the left and right ends. As such an easy-opening processing portion, for example, a V-shaped opening notch, an I-shaped opening notch, or a slit in place of these notches may be provided.

Moreover, as an easy opening process part (8) of the said opening part (2), as shown in FIG.
A perforation or a half-cut line that crosses the corners of the bent portions (2A, 2A) rising from 6) in the width direction may be used. Examples of the method for forming these easy-opening processed portions (8) include laser processing, mechanical processing using a blade, thermal processing using a heat bar, and the like.

  As shown in FIG. 2, the left and right ends of the width direction of the opening part (2) of the packaging bag (1) are picked with fingers, and the easy opening part (8) is used as a trigger in either direction. When pulled, as shown in FIG. 3, the unsealed portion (2) in which the bent portions (2 A) are integrally joined has a difference in thickness with the upper and lower front members (6). Torn at the interface. Thus, as shown in FIG. 5, an opening (14) is formed in the front surface of the packaging bag (1).

  As shown in FIG. 3, a first zipper member (9) made of polyethylene, polypropylene, or the like is provided on the inner surface below the opening (2) of the front member (6), such as heat fusion over the width direction. Is provided. The first zipper member (9) engages with a second zipper member (11) of a reseal portion (7) to be described later to reseal the opening after opening.

  The reseal portion (7) includes a second zipper member (11) that engages with the first zipper member (9), and a sheet member (12) that joins the second zipper member (11) to the front member (6). It is composed of

  The second zipper member (11) is made of the same material as the first zipper member (9) and engages with the first zipper member (9). For example, the first zipper member (9) has a concave shape, and the second zipper member (11) has a convex shape. The second zipper member (11) is fixed to the sheet member (12) by means such as heat fusion.

  The upper end of the sheet member (12) is joined to the position above the opening (2) on the inner surface of the front member (6) by means such as heat fusion over the width direction. Further, a vent hole (15) is provided in an arbitrary portion above the second zipper member (11) of the sheet member (12). That is, a vent hole (15) is provided between the joint portion of the reseal portion (7) and the second zipper member (11).

  By providing the vent hole (15) in the sheet member (12) that forms the reseal portion (7) in this way, water vapor generated from the contents as the microwave oven is heated causes the vent hole (15 ) To prevent the expansion of the packaging bag (1) due to an increase in pressure inside the packaging bag (1) without being stayed in the packaging bag (1) There is no risk of polluting the microwave oven or causing harm such as burns to the human body.

  The form of the vent hole (15) is not particularly limited, but may be a through hole having a predetermined shape size in advance. For example, any one of a circle, an ellipse, a triangle, a quadrangle, a rectangle, or the like, or a plurality of the same or different shapes may be combined. The through hole can be provided by drilling such as laser or punching.

  Further, as another form of the vent hole (15), a label made of a body film or the like slightly larger than the through hole is covered on the inner surface of the re-sealing portion (7) of the through hole, and the periphery thereof has a predetermined seal width. It may be completely sealed entirely, or may have a seal shape in which a weak seal portion is provided that is partially unsealed or a portion where the seal portion peels off due to vapor pressure. In addition, when the above-mentioned label is completely sealed, it is necessary for the user to peel off the label and to penetrate the vent hole (15) before heating in the microwave oven.

The formation of these vent holes (15) can be performed simultaneously with or separately from the formation of the second zipper member (11) in the sheet member (12).

  Next, the back member (4) is a single film-like member made of a main body film. The bottom member (5) is also formed from a main body film, and is interposed between the front surface part (3) and the back member (4) by being folded back and forth so that the fold line extends in the left-right direction. The front end 5A and the rear end 5B are thermally fused and joined to the lower ends of the front member (6) and the back member (4), respectively.

  Thus, since the packaging bag (1) according to the present invention is a self-supporting packaging form in which a bottom folding portion is provided at the bottom, distribution and sales can be performed while the packaging bag (1) is left alone. The distribution efficiency is good because it can, and the display effect at the time of sale is also excellent. Furthermore, since it can be heated while the consumer is standing alone in the microwave oven, it is possible to prevent liquid leakage and liquid scattering from the vent hole (15).

  As for the front part (3) and the back member (4) comprised as mentioned above, the edge part of four directions is integrally joined by heat sealing | fusion except for an upper end. As shown in FIG. 4, when the filling port is sealed by heat sealing or the like after filling the seasoning liquid (A) as shown in FIG. 4, the packaging bag is completed. .

  Next, as shown in FIG. 10, the main body film (20) forming the packaging bag (1) according to the present invention has at least an outermost base material layer (21), a printed layer (22), and an adhesive. A layer (23) and an innermost sealant layer (25) are sequentially laminated. As shown in FIG. 11, an intermediate layer (24) may be provided between the outermost base material layer (21) and the innermost sealant layer (25) as necessary. The print layer (21) and the adhesive layer (23) are not essential layers, but are provided as necessary.

  The material of the outermost base layer (21) is not particularly limited as long as it has heat resistance and is generally used as a food packaging material heated in a microwave oven. For example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyolefins such as polyethylene (PE) and polypropylene (PP), polyamides such as nylon-6 and nylon-66 Stretched or unstretched films such as (PA), polycarbonate (PC), polyacrylonitrile (PAN), polyimide (PI), polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH) , Nylon-6 / metaxylylenediamine nylon 6 coextruded film, polypropylene / ethylene-vinyl alcohol copolymer coextruded film, or a laminate of two or more of these films laminated. A film may be.

  In addition, in order to open the packaging bag (1) according to the present invention more stably and linearly, it is preferable that the base material layer (21) is made of a film having linear tearability. Examples of the film having linear tearability include a uniaxially stretched film stretched in one direction and a biaxially stretched film having different longitudinal and transverse stretch ratios, and the packaging bag (1) of the present invention has linear tearability. A biaxially stretched film is preferred.

  As such a film having linear tearability, a biaxially stretched polyethylene terephthalate film (OPET), a biaxially stretched polyamide film (ON), or the like is often used. A film having linear tearability is linear in at least one of the longitudinal (longitudinal) direction of the film (MD (machine direction) direction) and the lateral (transverse direction) direction (TD (transverse direction) direction). It has a performance (easy tearing property) that can be easily torn.

  The biaxially stretched polyethylene terephthalate film (OPET), which is a film having linear tearability, is, for example, polybutylene terephthalate (modified) containing 5 to 20% by weight of polytetramethylene glycol (PTMG) units having a weight average molecular weight of 600 to 4000. A biaxially stretched polyethylene terephthalate film (OPET) manufactured using a raw material obtained by mixing PBT) and polyethylene terephthalate (PET) in a ratio of PET / modified PBT = 70/30 to 95/5 (weight ratio). Can be mentioned.

  Next, as the biaxially stretched polyamide film (ON), which is a film having linear tearability, for example, aliphatic polyamide (PA) and polymetaxylene adipamide (MXD6) are PA / MXD6 = 80 / A biaxially stretched polyamide film (ONy) produced using raw materials mixed at a ratio of 20 to 95/5 (weight ratio) can be mentioned.

  Further, the thickness of the base material layer (21) is preferably in the range of 10 to 50 μm, more preferably in the range of 10 to 30 μm, in consideration of workability.

  Next, the innermost sealant layer (25) includes, for example, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a high density polyethylene resin (HDPE), and a linear low density polyethylene resin (L- LDPE), polypropylene resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene -Methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl methacrylate copolymer (EMMA), ionomer resin, ethylene-vinyl acetate copolymer (EVA), etc. A resin or a film obtained by forming these resins into a film can be used.

  Further, the thickness of the sealant layer (25) is preferably in the range of 20 to 100 μm, more preferably in the range of 30 to 70 μm, considering the sealing strength, physical properties, and workability.

  Next, a method of laminating the outermost base material layer (21) and the innermost sealant layer (25) via the adhesive layer (23) includes, for example, a dry lamination method, an extrusion lamination method, and the A known method such as a sandwich lamination method using an extrusion lamination method can be used.

  As the adhesive used in the dry lamination method, generally, an adhesive for laminating such as polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, or the like can be used.

  Next, the printed layer (22) can be printed on either the front or back side of the base material layer (21). However, as in the case of printing on a general plastic film bag, the ink has friction resistance and weather resistance. In view of the above, it is preferable to provide a beautiful print layer (21) on the inner surface of the base material layer (21) by a gravure printing method or the like for the purpose of improving the sales promotion effect of the product.

  Next, in the present invention, as shown in FIG. 11, an intermediate layer (24) may be provided between the base material layer (21) and the sealant layer (25), and the intermediate layer (24). Is usually provided when the substrate layer (21) and the sealant layer (25) alone cannot sufficiently function as the packaging bag (1).

Examples of the functions include gas barrier properties, mechanical toughness, flex resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, chemical resistance, and the like. These required functions are achieved by providing the intermediate layer (24).

  When the contents stored in the packaging bag (1) according to the present invention require resistance to oxygen gas, water vapor, light, etc., long-term room temperature circulation, etc., the intermediate layer (24) includes a gas barrier layer ( (Not shown) must be provided.

  For the gas barrier layer, a gas barrier film in which a gas barrier layer is provided on a gas barrier resin film or a base film is used. For example, ethylene-vinyl alcohol copolymer film (EVOH), polyvinyl alcohol film (PVA), ethylene-vinyl acetate copolymer (EVA) saponified film, polyethylene terephthalate (PET), polyamide (PA), polypropylene (PP) film coated with polyvinylidene chloride, inorganic oxide (silicon oxide, aluminum oxide, etc.) deposited thin film layer, or laminated film combining one or more of these films Among these, a gas barrier film provided with a deposited thin film layer of an inorganic oxide (such as silicon oxide or aluminum oxide) that can be heated in a microwave oven and can be easily disposed of is preferable.

  Next, the operation | movement at the time of use of the packaging bag (1) based on this invention is demonstrated. First, as shown in FIG. 2, the method of opening and opening the opening part (2) of the packaging bag (1) is performed by pointing one of the left and right end parts in the width direction of the opening part (2). And pull it in the left or right direction using the easy-open processing part (8) as a trigger. Then, the opening part (2) to which the bent part (2A) is integrally joined is torn at the interface with the upper and lower front members (6) due to the difference in thickness from the upper and lower front members (6). Thus, as shown in FIG. 5, an opening (14) is formed in the front surface of the packaging bag (1).

  As shown in FIG. 6, the user releases the engagement between the first zipper member (9) and the second zipper member (11) to widen and open the opening (14). At this time, the sheet member (12) to which the second zipper member (11) is fixed is also pulled away from the front member (6).

  As shown in FIG. 7, the user puts food (F) such as potatoes and carrots into the packaging bag (1) through the opening (14), and then, as shown in FIG. 8, the first zipper member (9) And the second zipper member (11) are engaged and resealed.

  Subsequently, as shown in FIG. 9, the food (F) is cooked together with the seasoning liquid (A) when placed in a microwave oven with the opening (14) facing upward and heated. At this time, the bottom member (5) rises due to water vapor generated inside the packaging bag (1), the volume of the packaging bag (1) increases, and a steaming space (S) in which the water vapor generated in the upper portion stays is formed. The The amount of water vapor exceeding the volume of the packaging bag (1) is appropriately diffused to the outside from the vent hole (15) formed in the reseal portion (7), and rupture is prevented. After cooking, the user cuts and opens the upper end of the packaging bag (1) and places the food (F) and seasoning liquid (A) in the container.

  According to the packaging bag (1) according to the present invention, the unsealed part (2) has a plurality of bent parts (2A) formed by folding the front member (6) and is integrally joined thereto. Due to the difference in thickness between the upper and lower front layer members (6), the interface between the unsealed part (2) and the front member (6) is easily torn without requiring a large force. Therefore, the packaging bag (1) can be opened smoothly with a simple structure without providing special processing such as providing a ruled line in the opening part (2) or arranging another member for cutting. Can be configured.

In addition, since the front member (6) is formed of a single sheet-like main body film including the opening portion (2), the packaging bag (1) has a simple structure with a small number of parts. Can be configured.

  Moreover, after opening once and throwing in foodstuffs etc., the 2nd zipper member of a reseal part and the 1st zipper member of a front-surface part can be reengaged, and it can heat safely with a microwave oven.

  Moreover, if it installs in a microwave oven and heats, a foodstuff (F) will be cooked with a seasoning liquid (A). At this time, the amount of water vapor exceeding the volume of the packaging bag (1) is appropriately diffused to the outside from the vent hole (15) formed in the reseal portion (7) to prevent rupture. Therefore, the contents do not scatter and there is no risk of polluting the inside of the microwave oven or causing harm such as a burn to the human body.

  Furthermore, the bottom surface member (5) bent back and forth rises with the generation of water vapor accompanying cooking, and a steaming space (S) is formed. Therefore, uniform heating is performed inside the packaging bag (1), and cooking can be performed satisfactorily.

  Hereinafter, the packaging bag (1) according to the present invention will be described in more detail with specific examples.

<Example 1>
In order from the outermost layer, 12 μm thick biaxially stretched polyethylene terephthalate film (OPET), 15 μm thick linear tearable biaxially stretched polyamide film (ONy), and 60 μm thick unstretched polypropylene film (CPP) A roll-shaped main body film was produced by dry lamination using an adhesive.

  Three roll-shaped body films for the front member, sheet member, and back member are attached to each of the upper, middle, and lower unwinding devices installed at predetermined positions of the bag making machine, and finished external dimensions. Thus, a packaging bag having a width of 120 mm × length of 200 mm, a bottom member folding length of 20 mm × 2 = 40 mm, and a top and left and right seal width of 10 mm was obtained.

  That is, the main body film for the front member in the upper stage was fed out, and in the finished state, a bent portion projecting 10 mm outward was formed at a position 60 mm from the tip of the top seal portion to provide an opening portion. Subsequently, a first zipper member made of polypropylene (PP) was attached at a position 60 mm below the bent portion.

  At the same time, in the finished state of the main body film for the sheet member, a vent hole composed of a through hole with a diameter of 5 mm at a position 50 mm from the tip of the top seal portion, and the first zipper member at a position 70 mm below the center of the vent hole After attaching the second zipper member that engages with the first zipper member and the second zipper member, the unsealed portion and the upper front member to which the first zipper member is attached are overlapped with each other. The main body film for the sheet member that becomes the reseal portion is sealed with a width of 5 mm across the width direction at a position 30 mm from the tip of the top seal portion that is the upper side of the opening portion of the front surface upper end inner surface of the front member. It cut | disconnected over the width direction in the position below 100 mm from the front-end | tip, and obtained the front member which consists of a main body film which provided the reseal part of width 120mm x length 100mm.

Next, the bottom member made of the body film folded into a length of 20 mm with the sealing surface on the outside is overlapped with the main body film for the lower back member and the front member provided with the reseal portion. Inserted between the back member and the front member, seals the left and right sides and bottom with a width of 10 mm, and at the same time, forms notches that are easy-opening parts at both ends of the opening part, and only the top part is unsealed A packaging bag in a state was obtained.

  Using the obtained packaging bag, the opening part is opened, the packaging bag is opened, the engagement between the first zipper member and the second zipper member is released, and the fillet and seasoning sauce are added, and the zipper The member was resealed and cooked for 7 minutes in a 600 W microwave. The generated steam was discharged from the vent hole, and the packaging bag could be cooked without breaking the bag.

<Example 2>
Example 1 Example 1 was conducted in the same manner as in Example 1 except that a 15 μm-thick linear tearable biaxially stretched polyamide film (ONy) and a 60 μm-thick unstretched polypropylene film (CPP) were used as the main body film. Two packaging bags were produced.

  Using the obtained packaging bag, the opening part is opened, the packaging bag is opened, the engagement between the first zipper member and the second zipper member is released, the fillet and seasoning sauce are added, and the zipper The member was resealed and cooked for 7 minutes in a 600 W microwave. The generated steam was discharged from the vent hole, and the packaging bag could be cooked without breaking the bag.

<Example 3>
In Example 1, a 12 μm thick biaxially stretched polyethylene terephthalate film (OPET), a 12 μm thick aluminum oxide (alumina) deposited biaxially stretched polyethylene terephthalate film (alumina deposited OPET), a 15 μm thick two A packaging bag of Example 3 was produced in the same manner as in Example 1 except that an axially stretched polyamide film (ONy) and an unstretched polypropylene film (CPP) having a thickness of 60 μm were used.

  Using the obtained packaging bag, the opening part is opened, the packaging bag is opened, the engagement between the first zipper member and the second zipper member is released, and the fillet and seasoning sauce are added, and the zipper The member was resealed and cooked for 7 minutes in a 600 W microwave. The generated steam was discharged from the vent hole, and the packaging bag could be cooked without breaking the bag.

It is a perspective view which shows one Example of the packaging bag which concerns on this invention. It is a perspective view which shows the state which opens the opening part of the packaging bag which concerns on this invention. It is side sectional drawing which shows one Example of the packaging bag which concerns on this invention. It is a sectional side view which shows the state with which the packaging bag which concerns on this invention was filled. It is a sectional side view which shows the state which opened the packaging bag which concerns on this invention. It is a sectional side view which shows the state which opened the opening of the packaging bag which concerns on this invention. It is a sectional side view which shows the state which throws a foodstuff into the packaging bag which concerns on this invention. It is a sectional side view which shows the state resealed after throwing food into the packaging bag which concerns on this invention. It is a sectional side view which shows the state at the time of the heat cooking of the packaging bag which concerns on this invention. It is a sectional side view which shows one Example of the laminated constitution which comprises the packaging bag which concerns on this invention. It is a sectional side view which shows the other Example of the layer structure of the laminated body which comprises the packaging bag which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Opening part 2A ... Bending part 3 ... Front part 4 ... Back member 5 ... Bottom member 5A ... Front end 5B ... Rear end 6. ..Front member 7 ... Re-sealing part 8 ... Easy opening part 9 ... First zipper member 11 ... Second zipper member 12 ... Sheet member 14 ... Open 15 ... Ventilation hole 20 ... Main body film 21 ... Base material layer 22 ... Print layer 23 ... Adhesive layer 24 ... Intermediate layer 25 ... Sealant layer A ... Seasoning liquid F ... Food S ... Steaming space

Claims (2)

  It is a packaging bag formed by integrally joining the four ends of the front member and the back member, and is provided at an intermediate position between the upper end and the lower end of the front member for forming an opening in the packaging bag. An opening portion; a first zipper member provided on an inner surface of the front member; and a second zipper member that engages with the first zipper member and reseals the opening so that the opening can be opened and closed. A re-sealing portion joined across the width direction on the inner side of the opening portion, and a vent hole is provided between the joining portion of the resealing portion and the second zipper member, and the opening portion The packaging bag is characterized in that two or more bent portions, in which a part of the front member is bent, are joined together to project toward the outer surface of the front member.   The packaging bag according to claim 1, further comprising a bottom member bent forward and backward, having a front end joined to a lower end of the front member and a rear end joined to a lower end of the back member.

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