JP2006327590A - Self-standing packaging bag for microwave oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-standing packaging bag for a microwave oven which is excellent in self-standing stability, content filling adaptability and exhibition effect over the counter without being overturned during the turn on a tray even when the packaging bag is heated in a microwave oven in a self-standing state, capable of automatically dropping the internal pressure, safely performing the heat-cooking without spilling any content, withstanding the boil/retort sterilization, and can be manufactured with good manufacturing efficiency. <P>SOLUTION: The self-standing packaging bag is used for heating by a microwave oven, and kept in a self-standing manner by allowing a bottom part thereof to be longitudinally expanded by a filled content. An easily steam-passing means 17 to discharge steam is formed above a side seal part of the packaging bag, and a semi-circular cutout part 1 is formed in right and left sides of a returning-back part of a bottom member 4 at the position inward of an end by 30-40 mm. Front and rear body members 2 and 3 are heat-bonded through the semi-circular cutout parts 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention does not peel off due to pressure or impact applied during transportation or storage, and automatically reduces the internal pressure when the contents are packaged and the bag is self-supporting when heated in a microwave oven. The present invention relates to a self-supporting microwave packaging bag.
More specifically, it is used for hermetically wrapping liquid and fluid contents in addition to solids and powders, etc., without spilling the contents, steam is quickly discharged, cooking can be done safely, and self-sustaining The present invention relates to a packaging bag for a microwave oven that is easy to take out from a microwave oven and has an excellent display effect at a store.

In recent years, with the widespread development of microwave ovens, and due to the demand for simplified cooking, cooked processed foods are packaged in plastic packaging bags, etc., sealed, and distributed in a form that preserves them. Yes.
Conventionally, a self-supporting packaging bag (a so-called standing pouch) has been folded into two body members whose side portions are sealed and a peripheral edge which is sealed by the lower end portions of the two body members. And a bottom member. Further, the bottom member is formed at a point about 25 mm inward from the end of the folded portion, and the front and rear body members are heat-welded through the semicircular punch hole. .
The self-supporting packaging bag has a planar structure before filling the contents, but after filling the contents inside, the folded bottom member spreads due to the weight of the contents, and is formed into a substantially conical shape. To do.
Since the self-supporting packaging bag can be displayed while standing at the storefront, the width of the display space is kept to a minimum, the appearance to the customer is good, and further, the packaging bag is placed in the microwave oven. It can be cooked in a self-supporting state, and is used after being cooked and transferred to a container.

However, in the conventional self-supporting packaging bag, it is a planar structure before filling the contents, but after filling the contents in the container, if the bottom spreads out in a boat shape due to the weight of the contents, Since the vertical length of the central part may shrink and the side of the packaging bag may float, it may cause lack of self-supporting stability and may roll over while rotating on the tray of the microwave oven. There is a problem that cooking by heating in a microwave oven with the self-supporting packaging bag being self-supporting is dangerous.
In addition, the constituent material of the self-supporting packaging bag is made of a plastic film, which is a flexible material, and becomes more flexible after heating in a microwave oven. There is a risk of overturning during rotation, and there is a problem that cooking by heating in a microwave oven with the self-supporting packaging bag being self-supporting is dangerous.

In such a self-supporting packaging bag, the stand has improved self-support so that when the contents are stored and the bottom film is unfolded, the legs of the outer periphery of the bottom 3 are in perfect contact with the flat tray surface all around. As a pouch, the lower end portions on both sides of the bottom heat seal portion of the packaging bag are characterized by cutting a trimming portion having a step in the range of 1 to 4 mm from the inclined rising portion of the boat bottom-shaped seal pattern to the end portions on both sides. A retort stand pouch for a microwave oven has been proposed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-450

  However, in the packaging bag of Patent Document 1, the bottom surface is folded into an inverted V shape and inserted into the front surface and the bottom surface of the quadrangle that form the body portion, and the front surface, the rear surface, and the bottom surface have respective peripheral edges. After forming the trunk heat seal part and the bottom heat seal part by heat sealing with, the lower end on both sides of the bottom heat seal part, from the inclined rising part of the boat bottom-shaped seal pattern to the end parts on both sides, It is necessary to cut off linearly so that the height of the end portion is inclined by 1 to 4 mm. In the bottom heat seal part of the packaging bag, the process of cutting the end to incline is impossible or extremely difficult in a continuous production line, and is conventionally performed manually by die cutting. As a result, the production efficiency is extremely low.

  The object of the present invention is to be able to seal and package solid, powder, liquid and fluid contents, and even if heated in a microwave oven while the packaging bag is in a self-supporting state, it rolls over while rotating on a tray. In addition, it is excellent in self-supporting stability, content filling suitability, in-store display effect, and without causing rupture, it is possible to automatically reduce the internal pressure, without spilling the content, It can be cooked safely, withstands boil sterilization or retort sterilization, and does not peel off due to pressure or impact applied during transportation or storage, and at the bottom heat seal of the packaging bag, Since the number of steps to be inclined is reduced, it is possible to provide a self-supporting microwave packaging bag that can be manufactured on a continuous manufacturing line and can be manufactured with high manufacturing efficiency.

  Therefore, in order to solve the above-mentioned problem, the packaging bag for a self-supporting microwave oven according to the present invention is a bag for heating with a microwave oven, and at least one surface is made of a composite film composed of a sealant layer. Then, a gusset portion is formed by inserting a bottom material having a folded-back portion on the inside by folding back the sealant layer so that the sealant layer is on the inside at the bottom of the front and rear body members facing each other with the sealant layer on the inside. In the self-supporting packaging bag of the form that can be self-supported by extending the bottom part back and forth with the filled contents, by thermally bonding the lower edge and the edge of the side edge leaving the upper end part that becomes the filling port of the contents, Easily steaming means for discharging steam is formed above the side seal portion of the packaging bag, and semicircular punch holes are formed on the left and right sides of the folded portion of the bottom material from the end portion. 30mm to 40mm It is formed by entering position towards, characterized in that a configuration in which the front and rear of the body member through the semi-circular punch holes are thermally welded.

  Further, in the self-supporting microwave packaging bag according to the present invention, the distance from the central portion of the packaging bag main body to the vapor venting means is the inner edge of the shortest thermal bonding portion from the central portion of the bag main body. The steam venting means is provided at a position shorter than the distance up to.

  Further, in the self-supporting microwave packaging bag according to the present invention, the steam release means forms a U-shaped seal portion independently or connected to the edge seal portion, and the U-shaped seal portion is formed in the U-shaped seal portion. It has an unbonded portion, a weakly bonded portion, or a pattern-shaped bonded portion, and is provided with at least one notch or notch.

  Further, in the self-supporting microwave packaging bag according to the present invention, the steam release means is connected to the edge seal portion to provide a U-shaped seal portion, and is surrounded by the U-shaped seal portion. The unsealed portion is formed by providing an unsealed portion at a part of the top seal portion or the trunk seal portion and communicating with the outside.

  Further, in the self-supporting microwave packaging bag according to the present invention, the seal strength of the heat-bonded portion between the sealant layers is 23 N / 15 mm or more, 100 N / 15 mm or less, 90 ° C. in the temperature range of 23 ° C. And in the range of 5 N / 15 mm or more and 25 N / 15 mm or less.

  In addition, the packaging bag for a self-supporting microwave oven according to the present invention is a packaging bag for retort sterilization treatment that can withstand a boil sterilization treatment or a retort sterilization treatment while filling the contents and sealing the upper end portion by thermal bonding. It is characterized by.

  The self-supporting microwave packaging bag of the present invention is excellent in self-supporting stability, filled with solids, powders, liquids, and fluid contents and hermetically packaged. In addition to being excellent in the display effect at the store, it is possible to manufacture with high production efficiency, and in the distribution process, it can be heated in a microwave oven while the packaging bag is left standing, without breaking the bag, It is a microwave oven packaging bag that can automatically reduce the internal pressure, and further has the advantage of being able to withstand boil sterilization or retort sterilization.

FIG. 1 is a diagram showing an example of a self-supporting microwave packaging bag A according to the present invention, in which (a) a film constituting the packaging bag, (b) a cross-sectional view of a laminate of packaging materials forming the packaging bag, (C) It is sectional drawing of the laminated body of another aspect of the packaging material which forms a packaging bag, (d) It is a top view of a packaging bag, (e) It is a perspective view of a packaging body, (f) It is sectional drawing of a packaging body. .
FIG. 2 is a view showing the shape of the U-shaped seal 9 in the microwave packaging bag A of the present invention, and FIG. 3 shows the notch 17 formed in the unsealed portion 19 surrounded by the U-shaped seal 9 or FIG. It is a figure which shows the shape of the notch | incision 18, FIG. 4 is sectional drawing of the XX line of FIG.

As shown in FIG. 1A, the film constituting the packaging bag A for a self-supporting microwave oven according to the present invention comprises a body member (two sheets) made of a square film of a front surface 2 and a rear surface 3, and a bottom surface 4. It is comprised from the bottom member (one sheet) folded in reverse V shape.
In the above-mentioned bottom member, the length of the folded portion folded in an inverted V shape is usually in the range of 10 mm to 90 mm, and the semicircular punch hole 1 is located at a point entering 30 mm to 40 mm inward from the end portion. It is preferable that the film is formed because the self-supporting stability is excellent in the packaged state sealed with the contents filled.

Next, as shown in FIG. 1B, the laminate 10 that forms the microwave packaging bag of the present invention includes a base material layer 12, a printing layer 11, an adhesive layer 13, and a sealant layer 15. They are stacked one after another.
Moreover, as shown in FIG.1 (c), you may provide the intermediate | middle layer 14 between the base material layers 12 and the sealant layer 15 as needed.
Note that the printing layer 11 and the adhesive layer 13 are not essential layers but are provided as necessary.

Next, as shown in FIG. 1 (d), the microwave packaging bag A of the present invention has an inverted V-shaped bottom surface 4 on a body member (two sheets) made of a square film of a front surface 2 and a rear surface 3. The bottom member (one piece) folded in is inserted, the peripheral part of the front surface 2, the rear surface 3, and the bottom surface 4 is heat-sealed, leaving the top seal portion 7, and the body seal portion 5 and A bottom seal portion 6 is formed to constitute a bag body.
In the present invention, the microwave packaging bag A according to the present invention has a position of the semicircular punch hole 1 formed on the left and right of the folded portion of the bottom material in a position more inward from the end than the conventional one. In particular, it is necessary to form at a position of 30 mm to 40 mm and to have a structure in which the front and rear body members are thermally welded through the semicircular punch hole 1.
As a result, after filling the packaging bag with the contents, the bottom part is easily expanded back and forth due to the weight of the contents, so that there is an advantage that the self-supporting stability is improved as compared with the conventional case.

Next, in the microwave oven packaging bag A of the present invention, the U-shaped seal portion 9 is preferably provided in connection with the trunk portion seal portion 5 as shown in FIG. As a result, when heated in a microwave oven, pressure is concentrated on the U-shaped seal portion 9, so that the seal peels off from the edge of the U-shaped seal portion 9 and is formed in the unsealed portion 19. The steam generated from the contents passes through the notches 17 and the like, and is quickly discharged out of the bag. Further, when the U-shaped seal portion 9 is formed, there is an advantage that the body seal portion 5 and the U-shaped seal portion 9 can be integrally sealed with good productivity.
Although the U-shaped seal portion 9 is not shown, the U-shaped seal portion 9 is not limited to the body seal portion 5, and the same effect as described above can be obtained by being connected to the top seal portion 7.
When the U-shaped seal portion 9 is not connected to the body seal portion 5 and is formed independently, the pressure of the steam generated by the heating of the microwave oven is increased. Since it passes between the part seal part and the independent seal part, it is difficult to apply pressure to the independent seal part efficiently, and it is not preferable because automatic opening does not occur smoothly. At this time or in the course of distribution, the contents enter between the independent seal portion and the body seal portion 5 and an appearance defect occurs, which is not preferable. Further, since the independent seal part and the peripheral seal part of the trunk seal part 5 and the peripheral seal part 7 are sealed in two steps, the productivity of the sealing process is inferior, which is not preferable.

Next, as shown in FIG. 1 (d), the position where the U-shaped seal portion 9 is formed is a U-shape from the center of the packaging bag A when a circle centered on the center of the packaging bag is drawn. The radius r3 of the circle in contact with the lowermost end of the cylindrical seal portion 9 is provided at a position that is shorter than the radius r1 of the circle in contact with the inner edge of the body seal portion 5.
When the radius r3 is longer than the radius r1 or the radius r2, the peeling and retreating of the seal part due to the heat of steam generated by heating and the increase of the internal pressure is peeled off at the trunk part seal part 5 of the packaging bag. If the bag is broken, the contents may leak, which is not preferable.

Next, as shown in FIGS. 2A to 2C, the U-shaped seal portion 9 has a protruding end 20 having a shape protruding from the lowermost end of the seal portion. If the protruding end 20 is formed, the shape is not limited to a U shape, and may be a trapezoidal shape or a triangular shape.
This makes it easy for the internal pressure due to heating to be concentrated on the tip, so that the tip 2
Since the peeling and retreating of the seal portion proceeds reliably and smoothly starting from 0, it is safe and preferable.
On the other hand, if the U-shaped seal portion 9 is circular or semicircular with no corners, the internal pressure generated by heating is dispersed, resulting in more pressure in the separation and retraction of the seal portion. This is not preferable because it does not peel off smoothly and a larger pressure is applied to portions other than the U-shaped seal portion 9.

Further, by forming the unsealed portion 19 surrounded by the U-shaped seal portion 9, the position where the notch or notch is formed in the unsealed portion 19 compared to the case where the unsealed portion 19 is not formed. Even if the gap is shifted, the distance at which the seal peels and retreats is constant, and when the separation reaches the unsealed portion 19, the notches 17 and the notches 18 formed in the unsealed portion 19 can be opened widely at once. In the case of heating in a microwave oven, there is an advantage that steam can be surely, stably and quickly removed.
If the unsealed part 19 surrounded by the U-shaped seal part 9 is not formed and only the solid seal is formed, the distance of the seal peeling and retreating changes when the position where the notch 17 or the notch 18 is formed changes. As a result, it is not preferable because stable seal peeling is not always performed.
Further, since the notch 17 or the notch 18 is inside the U-shaped seal portion 9 and the trunk portion seal portion 5, it can be kept hygienic because it can completely maintain the sealing performance at the distribution stage.

Further, as another shape of the U-shaped seal portion 9, as shown in FIG. 2D, a cut or notch is formed in the unsealed portion 19 surrounded by the U-shaped seal portion 9. Alternatively, the unsealed portion 19 surrounded by the U-shaped seal portion 9 may be configured such that a part of the unsealed portion 16 is provided in the trunk portion seal portion 5 to communicate with the outside.
This eliminates the need for a step of forming a cut and a notch, and allows the body seal portion 5, the top seal portion 7 and the U-shaped seal portion 9 to be integrally heat-sealed, and at the same time easy-to-steam. The unsealed portions 16 and 19 can be formed, so that the productivity can be greatly improved, and there is a possibility that punched waste generated at the time of cutting or notching adheres to or is mixed into the packaging bag. Therefore, there is an advantage of excellent hygiene.

Further, when the contents are liquid, at the position where the U-shaped seal portion 9 is formed, the protrusion 20 at the lowermost end of the seal portion is positioned higher than the liquid level of the contents when automatic opening by heating. It is necessary to prevent the contents from spilling.
The seal width e of the U-shaped seal portion 9 is preferably about 2 mm to 5 mm because the seal can be smoothly peeled off by internal pressure due to heating.
If the seal width e of the U-shaped seal portion 9 is less than 2 mm, it is not preferable because the seal strength of the seal portion is unstable. If it exceeds 5 mm, it is difficult to peel off the seal portion due to the internal pressure rising by heating. This is not preferable.
On the other hand, in the microwave oven packaging bag 1 of the present invention as shown in FIG. 1A, the seal width of the peripheral seal portion, that is, the trunk seal portion 5, the bottom seal portion 6, and the top seal portion 7 As g, about 6 mm to 20 mm is preferable because the bag is not broken by pressure or impact applied during transportation or storage.
Further, an unsealed portion having a width of an unsealed portion communicating with the inside and outside of the body seal portion 5 and the like is about 1/5 to 3/5 with respect to a vertical dimension c of the U-shaped seal portion. This is preferable in that the steam in the bag generated by heating can be smoothly discharged outside the bag without spilling out the contents. Specifically, the inside and outside communicate with the trunk seal portion 5 and the like. It is preferable that the width A of the unsealed portion is about 10 mm to 3 mm.
If the width communicating with the inside and outside of the body seal portion 5 is less than 1 mm, the steam in the bag cannot be smoothly discharged outside the bag, the internal pressure rises and the packaging bag may swell and break the bag. Therefore, it is not preferred, and if it exceeds 3 mm and the liquid level of the content is lower than the steaming port, the content may be easily spilled from the steaming port after automatic opening.

Next, the constituent material of the laminated body 10 which forms the packaging bag 1 for microwave ovens of this invention is demonstrated.
First, the base material layer 12 is not particularly limited as long as it has heat resistance and is generally used as a food packaging material heated or cooked in a microwave oven.
For example, stretched polyethylene terephthalate film, silica-deposited stretched polyethylene terephthalate film, alumina-deposited stretched polyethylene terephthalate film, stretched nylon film, silica-deposited stretched nylon film, alumina-deposited stretched nylon film, stretched polypropylene film, polyvinyl alcohol-coated stretched polypropylene film, nylon 6 / Metaxylylenediamine nylon 6 co-pressed co-stretched film or polypropylene / ethylene-vinyl alcohol copolymer co-pressed co-stretched film or the like, or a composite film obtained by laminating two or more of these films may be used.
These substrate layers may be single layers or multilayers (laminates), have a melting point and heat resistance of 150 ° C. or higher, and have a thickness of about 10 μm to 50 μm, preferably about 10 μm to 30 μm.

The resin constituting the sealant layer 15 in the present invention is a heat-adhesive resin layer and is generally used as a food packaging material heated or cooked in a microwave oven, and has a sealing strength of 25 N / 15 mm width at a temperature of 90 ° C. or higher. Hereinafter, it is not particularly limited as long as it is 23 N / 15 mm or more at room temperature.
For example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid A resin such as a copolymer, an ethylene-methyl acrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-methyl methacrylate copolymer, or an ionomer can be used.
The sealant layer may be formed by extrusion lamination of these resins, or laminated in advance by a heat resistant substrate layer and dry lamination or extrusion lamination as a film formed by T-die method or inflation method. May be.
The thickness of the sealant layer is preferably about 20 μm to 100 μm, and more preferably 40 μm to 70 μm.

The seal strength between the sealant layers 15 is preferably 5 N / 15 mm width to 25 N / 15 mm width at a temperature of 90 ° C. or more, and more preferably 10 N / 15 mm width to 15 N / 15 mm width.
If the seal strength exceeds 25 N / 15 mm width at a temperature of 90 ° C. or higher, the seal retraction does not occur smoothly, and automatic opening may not be achieved quickly and reliably.
Further, the state of seal retraction is not particularly defined, but cohesive failure is preferred.
Further, the seal strength between the U-shaped seal portion 9 and the peripheral seal portion, that is, the body seal portion 5, the bottom seal portion 6 and the top seal portion 7 may be different. However, even if they have the same strength, automatic opening is achieved by the shape described above.
Moreover, it is preferable that it has a seal strength of 23 N / 15 mm or more at normal temperature because it can be used without being peeled off by pressure or impact applied during transportation or storage.

  The sealant layer 15 has sufficient sealing strength especially at low temperatures (0 ° C.) and normal temperatures (25 ° C.), and has low sealing strength when heated in a microwave oven (90 ° C. or higher), and can be quickly peeled off. As the heat-adhesive resin layer having the above, it is preferable to use a layer composed of a resin composition containing a propylene-ethylene block copolymer resin as a main component. The blending ratio of each composition of the mixed resin is as follows. The propylene-ethylene block copolymer (A) as the first component, the propylene-ethylene block copolymer (B) as the second component, and the third component An ethylene-butene-1 copolymer containing 15% by weight or more of butene-1 as an essential component, and the propylene-ethylene block copolymer (A) as the first component is a propylene homopolymer or ethylene content Of propylene block (I) consisting of propylene-ethylene copolymer having a content of 2% by weight or less and ethylene-propylene copolymer block (II) having an ethylene content of 20 to 95% by weight of 15 to 35% by weight The propylene-ethylene block copolymer (B) as the second component is a propylene homopolymer or ethylene content 85 to 95% by weight of propylene block (III) comprising propylene-ethylene copolymer of 2% by weight or less, and 5 to 15% by weight of ethylene-propylene copolymer block (IV) having ethylene content of 20 to 95% by weight It is appropriate to use within a range.

Next, the lamination of the base material layer 12 and the sealant layer 15 is not particularly limited as long as it is a method such as a coextrusion laminating method or a dry laminating method.
The adhesive layer 13 is an adhesive by lamination or an adhesive resin layer.
In the above, as the laminating adhesive, for example, one-part or two-part curable or non-cured vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, etc. It is possible to use adhesives for laminating such as rubber type, other solvent type, aqueous type, or emulsion type.
As a coating method of the adhesive for laminating, for example, direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, fountain method, transfer roll coating method, and other methods can be used. .
As the coating ^{amount, 0.1g / m 2 ~10g / m} 2 ( dry state) position are ^{preferred, 1g / m 2 ~5g / m} 2 ( dry state) position is more preferred.
In the above, a resin layer made of a thermoplastic resin layer is used as the adhesive resin layer, and can be used for bonding the respective layers.
Specifically, the material of the adhesive resin layer includes a low density polyethylene resin, a medium density polyethylene resin, a high density polyethylene resin, a linear low density polyethylene resin, and ethylene / α-olefin polymerized using a metallocene catalyst. Copolymer resin, ethylene / polypropylene copolymer resin, ethylene / vinyl acetate copolymer resin, ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, ethylene / methacrylic acid copolymer resin, Graft polymerization of unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, ester monomer to ethylene / methyl methacrylate copolymer resin, ethylene / maleic acid copolymer resin, ionomer resin, polyolefin resin, Or graft copolymerized resin, maleic anhydride to polyolefin resin It can be used sexual resin or the like.
These materials can be used alone or in combination.
The thickness of the resin layer is preferably about 10 μm to 30 μm.

Furthermore, in this invention, you may provide the intermediate | middle layer 14 between the said base material layer 12 and the said sealant layer 15, and the said intermediate layer 14 is the said base material layer 12 and the said sealant layer normally. 15 is provided when the function as the packaging bag 1 cannot be sufficiently achieved with 15 alone.
The above functions include gas barrier properties, mechanical toughness, bending resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, chemical resistance, etc., which are required as a packaging bag 1 These functions are achieved by providing the intermediate layer 14 as an intermediate layer 14.
Examples of the base material used as the intermediate layer 14 include polyolefins such as polyethylene terephthalate, polyamide, polyethylene, and polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer. A film made of fluoride, a film obtained by coating polyvinylidene chloride on the film, a film obtained by depositing an inorganic substance such as silicon oxide or aluminum oxide, or a film such as polyvinylidene chloride can be used. One or more of these substrates can be used in combination. It should be noted that the thickness of the base material only needs to satisfy the function required for the package, and can be appropriately selected as necessary.

In addition, when performing said lamination | stacking, if necessary, it can pre-process, such as a corona treatment, an ozone treatment, a frame process, etc., and can laminate | stack.
The above-mentioned surface pretreatment is carried out as a method for improving the adhesion and the like when laminating each resin film or sheet and each layer. As a method for improving the above adhesion, for example, A primer coat agent layer, an undercoat agent layer, an anchor coat agent layer, and the like can be arbitrarily formed in advance on the surface of various resin films or sheets to form a surface treatment layer.

As shown in FIG. 1, the microwave packaging bag A according to the present invention uses the laminate 10 for a microwave packaging bag described above, and has two wall films each having a body portion having a front surface 2 and a rear surface 3. The side edge portions of the film are heat-sealed with the body seal part 5, and the U-shaped seal part 9 is integrally formed by connecting to the body part seal part 5 on at least one side of the wall film, In a gusset form in which a notch 17 or the like is provided in an unsealed portion 19 surrounded by a U-shaped seal portion to communicate with the outside to form an easy-to-vaporize means, and the bottom surface 4 is folded back to the inside of the film. The bottom seal part 6 is formed and heat-sealed with a boat bottom-shaped seal pattern, and the self-supporting microwave packaging bag A according to the present invention can be manufactured.
In addition, it is preferable to form the notch 22 in the edge of the trunk | drum seal | sticker part 5 of a bag.
In this case, it is preferable to use a stretched film having a tearing directionality that is easy to tear laterally through the notch 22.
Next, after filling the contents, the upper end is sealed, the top seal portion 7 is sealed and sealed, and the package can be manufactured.
In the above, as the heat seal method, for example, a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal and the like are known. It can be done by the method.
In addition, although not shown in figure as a holding means formed in the packaging bag A for microwave ovens of this invention, you may make it easy to have the seal | sticker part of the trunk | drum seal | sticker part 5 or the top | upper part seal | sticker part 7 and to make it wide.

Next, as shown in FIG. 6, the notch 17 or the notch 18 formed in the U-shaped seal portion 9 may be provided so as to penetrate through two members constituting the opposed body portions, but only on one side. May be provided.
Further, the notch 17 or the notch 18 can be formed by laser processing, punching, or the like.
Next, as shown in FIG. 3, the shape of the notch 17 or the notch 18 formed in the unsealed part 19 surrounded by the U-shaped seal part 9 is a cross-shaped, I-shaped, U-shaped notch 18 or the like. A cutout 17 such as a circle, a triangle, or a rectangle can be formed.
The number of the notches 17 or the notches 18 is not limited to one and may be plural.
By forming the notch 17 or the notch 18 as described above, the notch 17 or the notch 18 provided in the unsealed portion 19 from the lowermost seal peeling portion of the U-shaped seal portion 9 from which the vapor filled in the bag has been peeled off. It can diffuse through the bag and reduce the internal pressure of the bag and avoid rupture.

Next, in the present invention, the upper end manufactured as described above is filled with the contents from the opening of the bag-like container body having an opening, and then the opening is sealed with a heat seal or the like at the upper end. The retort treatment according to the present invention is manufactured by manufacturing the packaging semi-finished product constituting the retort-processed packaging product according to the present invention and then subjecting the packaging semi-finished product to a heat treatment such as a retort treatment or a boil treatment. A packaged product can be manufactured.
In the above, as a method for retorting or boiling, for example, a normal retort kettle is used, and the temperature is about 95 ° C. to 135 ° C., preferably about 120 ° C., the pressure is 1 to 4 Kgf / cm ² · G. , Preferably about 2.1 kgf / cm ² · G, about 5 minutes to 120 minutes, preferably about 30 minutes, or a temperature, 90 to 100 ° C., preferably It can be carried out by a method of boiling at about 90 ° C. for about 5 minutes to 20 minutes, preferably about 10 minutes.
In the present invention, the contents can be subjected to heat sterilization or heat sterilization cooking by retort processing or boil processing as described above.
As the above retort processing method, hot water storage type that pressurizes hot water set in advance at a high temperature into the retort kettle, hot water spray type that pressurizes hot water by spraying it, steam Various methods such as a steam method in which pressure is applied by ejecting the liquid are possible.

  The packaging bag 1 may be filled with a liquid content in addition to the solid content. For example, solid food such as frozen sushi, curry, soup, soy sauce, sauce, soup stock, spice Can be filled and packaged with various fluid foods such as liquor for cooking, fruit juices, water, foods and drinks, withstands boil sterilization treatment or retort sterilization treatment, and leaves the bag self-supporting when eating food It can be cooked for a certain period of time in a microwave oven, and steam generated by heating can be quickly discharged, and the internal pressure can be automatically reduced. It can be stably heated or cooked without rolling over during rotation, has excellent filling ability of contents, has excellent display effect at the store, and does not require a die-cutting process to cut off the trimming part. Are those that can be well sealed processing and manufacturing efficiency.

The present invention will be further described below with reference to examples and comparative examples.
First, an alumina-deposited polyethylene terephthalate film with a thickness of 12 μm, a stretched nylon film with a thickness of 15 μm, and an unstretched polypropylene film with a thickness of 60 μm were dry-laminated with a two-component curable urethane adhesive. A laminated film of layer (12 μm) / 2-component curable urethane adhesive layer / stretched nylon film layer (15 μm) / 2-component curable urethane adhesive layer / unstretched polypropylene film layer (60 μm) was produced.
Using the laminated film produced above, it was cut into the size of two trunk members (155 mm × 147 mm) and one bottom member (80 mm × 147 mm).
Further, the above-mentioned bottom member was folded back so that the sealant layer (unstretched polypropylene film layer) was inside, and semicircular punch holes 1 having a diameter of Φ15 mm were put inward by 30 mm from the end on the left and right sides of the folded portion. Formed in position.
After that, using a bag making machine, it is folded back so that the sealant layer is on the inner side of the front and rear body members 2, 3 facing each other with the sealant layer 15 facing inside, and the folded portion is folded inward. The bottom member 4 having the shape is inserted, and the upper and lower body members are thermally bonded with a seal width of 10 mm through the semicircular punch hole 1 while leaving the upper end portion serving as a filling port for the contents, and the round bottom seal portion is thermally bonded. And a U-shaped seal part (longitudinal dimension c: 25 mm, lateral dimension d: 15 mm, seal width e: 3 mm, trunk seal width, bottom seal width f: 5 mm). A notch diameter: 8 mm) was formed to produce a self-supporting microwave packaging bag (outside dimensions, height a: 155 mm, width b: 147 mm) according to Example 1 shown in FIG.
The packaging bag obtained above does not require a die-cutting process for cutting off the trimming part after sealing the bottom seal part 6 and can be manufactured only by sealing with high manufacturing efficiency.
In the packaging bag obtained above, 200 g of miso soup is added as the contents, and the top seal portion 7 is sealed and sealed, and then using a steam retort sterilizer, the pressure is 2.1 kg / cm ² , A retort-sterilized package that was retort-sterilized at 120 ° C. for 20 minutes was produced.
The package obtained above has excellent self-supporting stability, so it is excellent in filling suitability, placed on a tray in a microwave oven (rated high-frequency output 500 W), and does not rotate and overturns during heating. I was able to cook well.
And after heating said packaging body in a microwave oven about 1 minute and 20 seconds, it peels from the protrusion 20 of a U-shaped seal part, and it is steam from the notch formed in the unsealed part in a U-shaped seal part. Was quickly removed, the contents were not spilled, and the contents could be safely removed without sacrificing the flavor.

In Example 1, it is the same as that of Example 1 except that the bottom member constituting the self-supporting microwave packaging bag is formed so that the position of the semicircular punch hole 1 is located 35 mm inward from the end. The packaging bag which concerns on Example 2 was produced with the same manufacturing method using material.
In the packaging bag obtained above, 200 g of miso soup is added as the contents, the top seal portion 7 is sealed and sealed, and then, using a steam retort sterilizer, pressure 2.1 kg / cm ² , temperature A retort-sterilized package that was retort-sterilized at 120 ° C. for 20 minutes was produced.
The packaging bag obtained above does not require a die-cutting process for cutting off the trimming part after sealing the bottom seal part 6 and can be manufactured only by sealing with high manufacturing efficiency.
In addition, the package obtained above has a lower center of gravity than Example 1, has better self-supporting stability, better filling suitability, and is placed on a tray in a microwave oven (rated high-frequency output 500 W) and rotates. Thus, it was possible to cook with good self-supporting stability without falling during heating.
Then, the package was heated in the microwave oven for about 1 minute and 20 seconds, and then peeled off from the protruding end 20 of the U-shaped seal part and formed on the unsealed part 19 in the U-shaped seal part 9. Vapor quickly escaped from the notch 17 and the contents were not spilled, and the contents could be safely removed without sacrificing the flavor.

In Example 1, it is the same as Example 1 except that the position of the semicircular punch hole 1 is formed at a position 40 mm inward from the end portion on the bottom member 4 constituting the self-supporting microwave packaging bag. The packaging bag which concerns on Example 3 was produced with the same manufacturing method using this material.
In the packaging bag obtained above, 200 g of miso soup is added as the contents, the top seal portion 7 is sealed and sealed, and then, using a steam retort sterilizer, pressure 2.1 kg / cm ² , temperature A retort-sterilized package that was retort-sterilized at 120 ° C. for 20 minutes was produced.
The packaging bag obtained above does not require a die-cutting process for cutting off the trimming part after sealing the bottom seal part 6 and can be manufactured only by sealing with high manufacturing efficiency.
In addition, the package obtained above has a lower center of gravity than those of Examples 1 and 2 and is more excellent in self-supporting stability, excellent in filling suitability, and placed on a tray in a microwave oven (rated high-frequency output 500 W). It was possible to cook with good self-supporting stability without rotating and overturning during heating.
Then, the package was heated in the microwave oven for about 1 minute and 20 seconds, and then peeled off from the protruding end 20 of the U-shaped seal part and formed on the unsealed part 19 in the U-shaped seal part 9. Vapor quickly escaped from the notch 17 and the contents were not spilled, and the contents could be safely removed without sacrificing the flavor.

A packaging bag according to the present invention produced by the same material and manufacturing method as in Example 1 was filled with 75 g of hamburger as the contents, the top seal portion 7 was sealed and sealed, and then a steam retort sterilizer was used. Then, a retort-treated package that was subjected to retort sterilization under conditions of pressure 2.1 kg / cm ² , temperature 120 ° C., and 30 minutes was produced.
The packaging bag obtained above does not require a die-cutting step of cutting the trimming portion after sealing the bottom seal portion, and can be manufactured only by sealing processing with high manufacturing efficiency.
In addition, the package obtained above has a lower center of gravity than those of Examples 1 and 2 and is more excellent in self-supporting stability, excellent in filling suitability, and placed on a tray in a microwave oven (rated high-frequency output 500 W). It was possible to cook with good self-supporting stability without rotating and overturning during heating.
The package was heated in a microwave oven for about 1 minute and 20 seconds, and then peeled off from the protruding end 20 of the U-shaped seal portion, and formed on the unsealed portion 19 in the U-shaped seal portion 9. Vapor quickly escaped from the notch 17 and the contents were not spilled, and the contents could be safely removed without sacrificing the flavor.

[Comparative Example 1]
In Example 1, it is the same as Example 1 except that the position of the semicircular punch hole 1 is formed at a position 40 mm inward from the end portion on the bottom member 4 constituting the self-supporting microwave packaging bag. The packaging bag which concerns on the comparative example 1 was produced with the same manufacturing method using this material.
In the packaging bag obtained above, 200 g of miso soup is added as the contents, the top seal portion 7 is sealed and sealed, and then, using a steam retort sterilizer, pressure 2.1 kg / cm ² , temperature A retort-sterilized package that was retort-sterilized at 120 ° C. for 20 minutes was produced.
Using the package obtained as described above, in a microwave oven (500 W), when heated in a state where the microwave packaging bag was rotated on a tray for 2 minutes while being self-supported, about 1 minute 30 seconds to After 1 minute and 50 seconds, the steam quickly escapes from the unsealed part A communicating with the trunk seal part 5 and the like, and there is no spillage of the contents, but the center of gravity is high compared to Examples 1 to 4, Although it did not fall, it was lacking in stability.
As is clear from the above results, the packaging bags for microwave ovens according to Examples 1 to 4 have a lower center of gravity than the conventional product (Comparative Example 1). Even if the laminated film is softened, it has superior self-supporting stability, excellent filling suitability, and does not roll over during rotation even if it is rotated on a tray in a microwave oven. Met.
In contrast, in Comparative Example 1 (conventional product), when the laminated film constituting the packaging bag is softened by heating with a microwave oven, when the packaging bag is rotated on a tray in the microwave oven, Lack of stability, there is a risk of falling, and it was not fully satisfactory.

It is a figure which shows the Example of the packaging bag A for self-supporting microwave ovens of this invention, (a) Film which comprises a packaging bag, (b) Sectional drawing of the laminated body of the packaging material which forms a packaging bag, (c) Packaging It is sectional drawing of the laminated body of another aspect of the packaging material which forms a bag, (d) The top view of a packaging bag, (e) The perspective view of a packaging body, (f) It is sectional drawing of a packaging body. It is a figure which shows the shape of the U-shaped seal | sticker 9 in the packaging bag A for microwave ovens of this invention. It is a figure which shows the shape of the notch 17 or the notch 18 formed in the unsealed part 19 enclosed by the U-shaped seal | sticker 9. FIG. It is sectional drawing of the XX line of FIG. It is a figure which shows the Example of the conventional packaging bag C for self-supporting microwave ovens, (a) The top view of a packaging bag, (b) It is a perspective view of a package, (c) It is sectional drawing of a package. In FIG. 1, it is drawing for description of each dimension which concerns on the packaging bag A for self-supporting microwave ovens.

Explanation of symbols

1 Half-moon notch (semi-circular punch hole)
2 Front 3 Rear 4 Bottom 5 Body seal 6 Bottom seal 7 Top seal 8 Bottom film notch 9 U-shaped seal 10 Laminate 11 Print layer 12 Base layer 13 Adhesive layer 14 Intermediate layer 15 Sealant layers 16, 19 Unsealed portion 17 Notched portion 18 Notched portion 20 Protruding end portion 22 Notch A Self-supporting microwave packaging bag B of the present invention Self-supporting microwave packaging body C of the present invention For conventional self-supporting microwave oven Packaging bag D Conventional packaging for self-supporting microwave oven

Claims (6)

The sealant layer is a bag for heating by a microwave oven, and the sealant layer is formed at the bottom of the front and back body members facing each other with the sealant layer inside by using a composite film at least one surface of which is composed of the sealant layer. Fold it so that it is on the inside and insert a bottom material with a fold-like folded part on the inside to form a gusset part, leaving the upper edge part that will be the filling port of the contents, and the edge part of the lower side and the side edge In the self-supporting packaging bag of the form that can be self-supported by expanding the front and back by the contents that are thermally bonded, filled,
Easily steaming means for discharging steam is formed above the side seal portion of the packaging bag,
In addition, semicircular punch holes are formed on the left and right sides of the folded portion of the bottom material at positions entering 30 mm to 40 mm inward from the ends, and the front and rear body members are heated through the semicircular punch holes. A packaging bag for a self-supporting microwave oven characterized by being configured to be welded.   The steam release means is provided at a position where the distance from the center of the packaging bag body to the steam release means is shorter than the distance from the center of the bag body to the inner edge of the shortest thermal bonding part. The self-supporting microwave packaging bag according to claim 1.   The steam release means forms a U-shaped seal portion independently or connected to the edge seal portion, and has an unbonded portion, a weakly bonded portion, or a pattern-shaped bonded portion in the U-shaped seal portion. And at least 1 or more notch or notch is provided, The packaging bag for self-supporting microwave ovens of Claims 1-2 characterized by the above-mentioned.   The steam release means is connected to the edge seal portion to provide a U-shaped seal portion, and the unsealed portion surrounded by the U-shaped seal portion is connected to the top seal portion or the trunk seal portion. The self-supporting microwave oven packaging bag according to claim 1, wherein an unsealed portion is provided in part to communicate with the outside.   The seal strength of the heat-bonded portion between the sealant layers is in the range of 23 N / 15 mm or more and 100 N / 15 mm or less in the temperature region of 23 ° C., or in the range of 5 N / 15 mm or more and 25 N / 15 mm or less in the temperature region of 90 ° C. The packaging bag for self-supporting microwave ovens according to claim 1, wherein: The self-supporting microwave packaging bag is a packaging bag for retort sterilization treatment that can withstand a boil sterilization treatment or a retort sterilization treatment by filling the contents and sealing the upper end portion by thermal bonding. The packaging bag for self-supporting microwave ovens according to claim 1.

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