KR20130076764A - Pouch for microwave oven heating - Google Patents

Abstract

PURPOSE: A bag for microwave heating is provided to prevent the leakage of film elements and the quality degradation of contents caused by the partial overheating of a microwave. CONSTITUTION: A side sealing unit (6) is formed by sealing an edge unit of left and right sides of a wall film (1). A bottom sealing unit (7) is formed by inserting a bottom film into the wall film and sealing a main unit with a seal pattern having a gusset shape. The wall film is formed of a laminating film having a base layer, a middle layer, and a sealant layer. The middle layer is formed of an aluminum layer (2) partially formed by an aluminum etching technique. The sealing intensity of the sealing units is in a range from 23 N/15 mm to 100 N/15 mm at 23 °C and from 5 N/15 mm to 25 N/15 mm at 90 °C.

Description

Microwave Heating Bags {POUCH FOR MICROWAVE OVEN HEATING}

The present invention relates to a microwave heating bag, and more particularly, to a self-supporting microwave heating bag that can prevent overheating and overheating unevenness during heating in a microwave oven.

BACKGROUND ART Conventionally, a large number of packaged foods of a system in which foods such as cooking finished or semi-cooked foods are filled in a self-supporting bag made of a resin film and heated and cooked by a microwave oven before food are commercially available.

However, such heating of a packaged food in a microwave oven is difficult to uniformly heat the temperature, and in particular, heat tends to concentrate on a portion where the liquid level (upper surface) of the contents and the inner surface of the bag come into contact with each other.

Therefore, if the whole packaged food is to be heated to an appropriate temperature, local overheating will generate | occur | produce in the contact part of the upper surface of a content and the inner surface of a bag, and the quality of a content will fall and the resin film component will elute.

In this document, in Patent Documents 1 and 2, overheating is prevented by preparing a component of the contents. However, this is undesirable because it affects the taste of food.

Moreover, in patent documents 3 and 4, overheating is prevented by arrange | positioning the protrusion of the material which has the function to collect a microwave. However, this is difficult to apply to the self-supporting sealing which consists only of a resin film.

In addition, local overheating in a microwave oven may lead to the combustion of food, which is very dangerous.

In this document, in Patent Document 5, risk is avoided by providing a means for detecting overheating in a microwave oven.

Japanese Laid-Open Patent Publication 2000-71 Japanese Unexamined Patent Publication No. 2008-188007 Japanese Patent Laid-Open No. 6-189715 Japanese Laid-Open Patent Publication No. 7-23721 Japanese Patent Application Laid-open No. Hei 6-104080

This invention solves the said problem, does not prepare the component of a content, and does not need to form a structure other than a resin film, and it does not have to form local overheating or overheating nonuniformity in a microwave oven, and the quality deterioration of the content by it, An object of the present invention is to provide a self-supporting microwave heating bag capable of preventing elution of a resin film component.

MEANS TO SOLVE THE PROBLEM As a result of various studies, the present inventors found that the body part formed by heat-sealing the edge part of the left and right both sides of the front and back wall surface film, and forming a side seal part, and the lower part of the said front and back surface 2 wall film A bottom heating film is a bottom portion formed by folding a bottom film inwardly and bending it, and heat-sealing a peripheral portion in a gusseted seal pattern to form a bottom seal portion. And a base film layer, an intermediate | middle layer, and the laminated | multilayer film which has a sealant layer used as an innermost layer, The said intermediate | middle layer consists of the aluminum layer partially formed by the aluminum etching technique, and the edge part of this aluminum layer is a wall film In order not to be exposed to the end surface of the substrate, the substrate layer and the sealant layer are retracted inward from the edges, and the left and right edges are It is embedded in the id seal portion, and the upper edge thereof is formed to be higher than the height at which the upper surface of the filled contents is located, and the lower edge thereof is formed to be lower than the height at which the upper surface of the contents is located. It was found that the microwave heating bag achieves the above-mentioned object.

And this invention is characterized by the following points.

1.Fold the bottom film back inward between the body part formed by heat-sealing the short edges of the left and right sides of the front and rear two side wall films and forming the side seal portion, and the lower part of the front and back two side wall film. And a bottom portion formed by forming a bottom seal portion by heat-sealing a peripheral portion in a gusseted seal pattern, wherein the front and rear two side wall films are formed of a base material layer, an intermediate layer, and a sealant that forms an innermost layer. A laminated film having a layer, wherein the intermediate layer is made of an aluminum layer partially formed by an aluminum etching technique, and the edges of the aluminum layer are formed of the base layer and the sealant layer so as not to be exposed to the end faces of the wall film. It retracts inward rather than the edge, and the left and right edges are embedded in the side seal portion, and the image The edge portion is formed so as to be higher than the height at which the upper surface of the filled contents is located, and the lower edge portion is formed so as to be lower than the height at which the upper surface of the contents is located, for microwave oven heating bag.

2. The top edge of said aluminum layer is embedded in the top seal part formed in the upper part of a wall film after filling of the content, The microwave oven heating bag of 1 characterized by the above-mentioned.

3. Seal strength of seal part is in the range of 23 N / 15 mm-100 N / 15 mm at 23 degreeC, and 5 N / 15 mm-25 N / 15 mm at 90 degreeC, The said 1 or 2 characterized by the above-mentioned. The microwave oven heating bag described in.

4. At a position higher than the height at which the upper surface of the filled contents is located, a means for easily passing steam for discharging steam is provided, and there is no aluminum layer in the means for easily passing steam and around it. The microwave oven heating bag as described in said 1-3.

5. The means for easily passing steam includes a point seal portion formed in connection with or independently of the side seal portion or the top seal portion, a miss seal portion formed inside the point seal portion, and at least one cut or cut in the miss seal portion. The microwave oven heating bag as described in said 4 characterized by the above-mentioned.

6. The shortest distance from the center of the bag to the point seal is shorter than the shortest distance from the center of the bag to the inner edge of any of the side seal, the bottom seal and the top seal. Microwave heating bag.

7. The microwave heating bag according to any one of 1 to 6 above, which is a packaging bag for retort sterilization treatment which can withstand the Boyle sterilization treatment or the retort sterilization treatment.

8. The periphery of the aluminum layer is comprised by a straight line and a curve, and has no angle | corner, The microwave oven heating bag in any one of said 1-7 characterized by the above-mentioned.

The microwave heating bag of the present invention is a self-supporting bag formed by using a laminated film having a base material layer and a sealant layer as a wall surface film and a bottom film. And a wall surface film has an aluminum layer as a intermediate | middle layer between a base material layer and a sealant layer in the position which contact | connects the upper end surface of a content.

Therefore, the microwave heating bag of the present invention can be put into a microwave as it is and heat the contents. At that time, since the aluminum layer blocks the microwaves near the upper end surface of the contents, it occurs locally at this portion. Easy overheating and dolby can be prevented. Moreover, since it does not locally become high temperature, the sealant component of a resin film, etc. do not elute in the content.

In addition, the top, bottom, left and right edges of the aluminum layer are retracted inward from the edges of the sealant layer and the base material layer so as not to be exposed to the end face of the wall film. Therefore, generation | occurrence | production of the spark at the time of microwave heating can be prevented.

In addition, the contact portion between the inner edge of the side seal portion and the upper end surface of the contents is a portion where heat is particularly easy to concentrate. In the microwave heating bag of the present invention, the left and right edge portions of the aluminum layer are embedded in the side seal portion of the bag. Therefore, also in this part, overheating and elution of a Dolby component and a sealant component can be prevented.

In the microwave heating bag of the present invention, the aluminum layer is laminated by an aluminum etching technique. Thereby, accurate lamination | stacking to the target position on a base material layer is possible, and generation | occurrence | production of the whisker burr which causes a spark can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating the structure of the bag for microwave oven heating of this invention.
It is a schematic sectional drawing which shows an example of the laminated constitution of the laminated | multilayer film which comprises the body part of the microwave oven heating bag of this invention.
It is a schematic sectional drawing which shows an example of the laminated constitution of the laminated | multilayer film which comprise the body part of the microwave oven heating bag of this invention.
It is a schematic sectional drawing which shows an example of the laminated constitution of the laminated | multilayer film which comprise the bottom part of the microwave oven heating bag of this invention.
It is a schematic diagram which shows an example of the microwave oven heating bag of this invention.
It is a schematic diagram which shows an example of the microwave oven heating bag of this invention.
It is a schematic diagram which shows an example of the microwave oven heating bag of this invention.
It is a figure which shows the shape of the point seal part which comprises the means for easily passing steam in the microwave heating bag of the present invention.
It is a figure which shows the shape of the notch or notch which comprises the means for easily passing steam in the microwave oven heating bag of this invention.
It is a schematic diagram for demonstrating the position which forms a point seal part.

This invention is demonstrated in detail below.

<1> Structure of the bag for microwave oven heating of the present invention

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating the structure of the microwave oven heating bag of this invention.

As shown in FIG. 1, the self-supporting microwave heating bag of the present invention is folded in an inverted V shape and inserted between the wall film (two sheets) of the front surface 1a and the rear surface 1b and the lower portion of the wall surface film. It consists of the bottom film 3 (one piece) which becomes. The size of the said wall surface film and a bottom film should just be arbitrary size according to a packaging use.

2 is a schematic cross-sectional view showing an example of the layer structure of a laminated film constituting the body portion of the microwave heating bag of the present invention. This laminated | multilayer film has the base material layer 4 which consists of at least a resin film, the sealant layer 5, and the aluminum layer 2 formed in part between these.

3 is a schematic cross-sectional view showing another example of the laminated constitution of the laminated film constituting the body portion of the bag for microwave heating according to the present invention. As shown in FIG. 3, you may have the barrier film layer 18 etc. between the aluminum layer 2 and the base material layer 4, or between the aluminum layer 2 and the sealant layer 5 as needed. .

4 is a schematic cross-sectional view showing an example of the layer structure of a laminated film constituting the bottom of the microwave heating bag of the present invention. This laminated | multilayer film has the base material layer 4 and the sealant layer 5 which consist of at least the resin film. As needed, you may have additional layers, such as the barrier film layer 18. As shown in FIG.

It is a schematic diagram which shows an example of the microwave oven heating bag of this invention. As shown in FIG. 5, the microwave oven sealing bag 20 of the present invention has a sealant layer in between a lower portion of two wall surface films of the front face 1a and the rear face 1b which are stacked so that the sealant layer is inward. The bottom film 3 folded in reverse V-shape is inserted so that the top seal portion 8 is left to be heat-sealed, and the side seal portion 6 and the bottom seal portion 7 are formed to form a sealed body. It is. In the present invention, the bottom seal portion 7 is formed by heat-sealing in a gusseted seal pattern that provides independence.

In the microwave heating encapsulation 20 of the present invention, the upper, lower, left, and right edges 2a, 2b, 2c, and 2d of the aluminum layer 2 are not exposed to the end face of the wall film 1 so as to expose the base layer ( 4) and back of the sealant layer 5 to the inner side. In addition, the left and right edges 2c and 2d are embedded in the side seal portion 6. In addition, the upper edge 2a is located at a position higher than the height 9 at which the liquid level (upper surface) of the filled contents is located when the self-supporting bag is settled, and the lower edge 2b is It is located at a position lower than the height (9).

Moreover, you may form the notch 10 for supporting opening of a bag, the cutting line which spreads over the left-right edge part, etc. suitably as needed.

It is a schematic diagram which shows another example of the microwave oven heating bag of this invention. In the microwave heating bag 30 of the present invention, the upper edge 2a of the aluminum layer 2 is located at a height embedded in the top seal portion 8. This can prevent the occurrence of sparks more reliably. That is, in the bag filled with the content, the content exists below and the space, ie, the phase of air, exists above. When electrons move in the phase of this air at the time of microwave heating, it may cause the spark of the aluminum layer which exists in the vicinity. However, as the upper edge 2a of the aluminum layer 2 is embedded in the top seal portion 8 as shown in FIG. 6, the movement of electrons in the air phase at the portion covered by the aluminum layer does not occur. Therefore, the occurrence of sparks can be prevented more reliably.

It is a schematic diagram which shows another example of the microwave oven heating bag of this invention. In the microwave heating bag 40 of the present invention, the steam passage means for discharging the steam generated at the time of heating out of the bag to a position higher than the height 9 at which the upper end surface of the contents is located (11). Is formed. Here, the aluminum layer 2 does not exist in the vapor passage means 11 and its surroundings.

The vapor passage easy means 11 may be any shape, for example, as shown in FIG. 7, the point seal part 12 formed in the co-shape in connection with the side seal part 6, and the point seal part It consists of an unbonded part (or a weakly bonded part or a patterned adhesive part) 13 formed in the inside, and at least one cutout part (or cutout part) 14. By forming the point seal part 12 in connection with the side seal part 6, the side seal part 6 and the point seal part 12 can be integrally sealed with favorable productivity.

Although not shown in the figure, the same effect as described above is also obtained by forming the point seal portion 12 in conjunction with the top seal portion 8.

In addition, although not shown in figure, the point seal part 12 can also be formed in arbitrary shapes, such as circular shape, independent of a side seal part or a top seal part.

FIG. 8: is a figure which shows an example of the shape of the point seal part 12 which comprises the vapor passage easy means 11. As shown in FIG. As shown to Fig.8 (a)-(c), the point seal part 12 which comprises the vapor passage easy means 11 is connected with the side seal part 6 or the top seal part 8, and It can be formed in a shape, trapezoidal shape or triangular shape. Here, by forming the protruding protruding end 15 at the lower end near the center of the sealing portion of the point seal portion 12, the peeling retreat of the seal portion can be reliably and smoothly progressed.

In addition, by forming the unsealed portion 13 surrounded by the point seal portion 12, it is possible to reliably and stably perform rapid steam releasing.

In addition, as another shape of the vapor passage easy means 11, as shown in FIG.8 (d), the micromicro | micron formed in the micro seal | sticker part 13 and the side seal | sticker part 6 which were surrounded by the point seal | sticker part 12 and It can also be set as the structure which communicates the part 16. Thereby, the process of forming a cutout and a notch is unnecessary, and it has the advantage that the side seal part 6, the top seal part 8, and the point seal part 12 can be integrally sealed with favorable productivity. .

It is a figure which shows the shape of the notch or notch formed in a unsealed part.

By forming the notch 14 or the notch 17, through the notch 14 or the notch 17 formed in the seal | sticker part 13 from the seal peeling part of the point seal part 12 which peeled | filled the vapor | steam full in a bag. It can dissipate out of the bag, lower the internal pressure of the bag, and avoid rupture.

As shown in FIG. 9, the shape of the notch 14 or the notch 17 may be an notch 17 such as a cross, an I shape, or a U shape, or a notch 14 such as a circle, a triangle, a rectangle, or the like. In addition, you may form one or more. Moreover, you may form so that it may penetrate the two wall surface films which comprise a body part, and you may form only in single side | surface. The notch 14 or the notch 17 can be formed by laser processing, punching, or the like.

FIG. 10: is a schematic diagram for demonstrating the position which forms a point seal part. FIG.

In particular, the position at which the point seal portion 12 is formed is a position higher than the height 9 at which the upper end surface of the contents is located, and may be any position at which steam is discharged out of the bag, as shown in FIG. The shortest distance r3 from the center of the bag to the point seal part is the shortest distance from the center of the bag to the inner edge of any of the side seal part 6, the bottom seal part 7 and the top seal part 8 ( It is preferable to form in a position shorter than r1). Thereby, the leakage of the content by the sealing rupture of a packaging bag can be prevented.

<2> laminated film forming bag for microwave heating

The laminated | multilayer film which forms the wall surface of the microwave oven heating bag of this invention has a base material layer, an aluminum layer, and a sealant layer at least. Moreover, the laminated | multilayer film which forms the bottom face of the microwave oven heating bag of this invention has a base material layer and a sealant layer at least.

Moreover, these laminated | multilayer films may have additional layers, such as a printing layer and a barrier layer, suitably as needed.

Substrate layer

In the laminated | multilayer film which forms the wall surface or bottom surface of the microwave oven heating bag of this invention, as a base material layer, arbitrary resin films which have heat resistance and are generally used as a food packaging material heated or cooked by a microwave oven are used. Can be used. For example, stretched polyethylene terephthalate (PET) 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 coat elongated polypropylene film, nylon 6 / methaxylylenediamine nylon 6 pneumatic performance stretching film, polypropylene / ethylene-vinyl alcohol copolymer pneumatic performance stretching film, or any of these two or more film laminated composite A film may be sufficient. Since a biaxially stretched PET film is excellent in heat resistance, tensile strength, and other comprehensive performance, and can protect the aluminum layer used as an intermediate | middle layer, and can prevent generation of a spark effectively, it is especially preferable.

These base material layers may be a single layer, or a multilayer (lamination) may be sufficient, it has heat resistance of 150 degreeC or more of melting | fusing point, and thickness is 10 micrometers-50 micrometers, Preferably it is about 10 micrometers-30 micrometers.

Aluminum layer

In the microwave heating bag of the present invention, an aluminum layer that does not transmit microwaves is disposed at a portion of the microwave heating bag that is in contact with the upper end surface of the content that is likely to overheat. As a result, the occurrence of overheating and uneven heating during microwave heating can be prevented, and the sealant component and the like can be prevented from eluting in the contents.

The upper, lower, left, and right edges of the aluminum layer are covered with a base material layer, a sealant layer, and the like, and are separated from the outside, so that sparks are prevented from occurring during microwave heating.

Moreover, the left and right edges are embedded in the side seal portion.

The upper edge is located at a position higher than the height at which the upper surface of the contents is located, and the lower edge is at a position lower than the height at which the upper surface of the contents is located. The position of the upper and lower edges may be at any position as long as it meets these requirements, and can be appropriately set according to the properties of the contents, the desired microwave heating rate, and the like. In particular, the upper edge may be embedded in the top seal portion, whereby the electrons can be prevented from moving in the phase of the air in the bag during heating of the microwave oven, thereby preventing the occurrence of sparks more reliably. It becomes possible.

For example, if the content contains small solids and there is a possibility of scattering, the aluminum layer is formed extensively. On the contrary, there is little scattering at the time of heating, When there is little variation, an aluminum layer can be formed in a narrow range.

Further, by forming the lower edge of the aluminum layer at a higher position within the range that satisfies the above requirements, the heating rate is increased, and conversely, the heating rate is lowered by forming at a lower position. If the lower edge is embedded in the bottom seal portion, the microwaves do not reach the contents, so that the heating of the contents does not proceed.

In the present invention, the aluminum layer is laminated by an aluminum etching technique. That is, an aluminum thin film is formed on laminated surfaces, such as a base material layer, and then, the resist layer which has a predetermined | prescribed pattern is printed on it. Subsequently, using this resist layer as a mask, the aluminum thin film of the unnecessary part is removed by etching, and then, if necessary, the resist layer is peeled off to form an aluminum layer having a cross section located inside the cross section of the substrate layer. Can be.

By using this method, an aluminum layer of uniform thickness can be laminated precisely at a desired position on the base material layer, and the occurrence of whisker burrs that cause sparks can be prevented.

As shown in FIG. 4, it is preferable that the resist layer and the aluminum layer are formed so that the periphery may consist of a straight line and a curve, and the corner part is rounded so that there is no angle. As described above, the absence of sharp parts on the periphery further increases the effect of preventing sparks.

The aluminum thin film can be formed by dry laminating aluminum foil or by aluminum vapor deposition.

Although the thickness of an aluminum layer does not need to specifically limit, According to the use of a laminated body, what is necessary is just to select in consideration of barrier property, bending suitability, cost suitability, etc. When dry-laminating an aluminum foil, it can thicken to about 200 micrometers, and when forming an aluminum layer by vapor deposition, it can also be made thin to about 5 nm.

For dry lamination of aluminum foil, arbitrary adhesives excellent in adhesive strength and heat resistance, for example, adhesive for laminations, such as a urethane type adhesive, a vinyl type adhesive, an acrylic type adhesive, and an epoxy type adhesive, can be used. The coating amount of the adhesive may be appropriately set so that the thickness of the adhesive is 0.1 g / m 2 to 10 g / m 2, more preferably 0.1 g / m 2 to 5 g / m 2 as a dry film. As needed, you may apply | coat a surface treating agent, such as an anchor coat agent, previously to a base material layer side, or may perform pretreatment, such as a corona treatment.

The resist layer is formed by printing any resist composition resistant to the etching solution on an aluminum thin film by any known printing method such as, for example, rotogravure printing, web printing, offset printing or screen printing.

The resist layer can also be formed by a conventional photolithography method using a photoresist composition.

Etching is carried out to the aluminum thin film of the area | region which is not covered with a resist composition, an appropriate etching liquid, for example, inorganic metal salts, such as aqueous solution of metal chlorides, such as ferric chloride and a cupric chloride, hydrochloric acid, phosphoric acid, or caustic soda, etc. It is implemented by dissolving and removing in an aqueous solution or the like. The thickness of a resist layer is not specifically limited, A person skilled in the art can determine suitably according to a use purpose.

Sealant layer

In the laminated | multilayer film which forms the wall surface or the bottom surface of the microwave heating bag of this invention, as resin which forms a sealant layer, arbitrary heat adhesiveness generally used as a food packaging material heated or heat-cooked in a microwave oven. Resin can be used.

The seal strength between the sealant layers has a seal strength (width of the test piece: 15 mm) of 23 N / 15 mm or more at normal temperature (23 ° C.) so as not to be peeled off due to pressure or impact applied during transport or storage. desirable.

In the case of forming the means for easily passing steam made of the point seal portion in the microwave heating bag of the present invention, the seal strength of the point seal portion varies depending on the amount of heat and steam required for heating or heating cooking of the contents. It is preferable that they are 5 N / 15 mm-25 N / 15 mm at the temperature of 90 degreeC or more. If the seal strength at 90 ° C is too small, the steam is discharged out of the bag before the internal vapor pressure becomes sufficiently high, so that heating or heating cooking of the contents becomes insufficient. Conversely, if the seal strength is too large, seal retraction does not occur smoothly, and automatic opening is not achieved quickly and reliably, and there is a fear that the bag is broken.

The seal strength of the point seal portion may be set weaker than the seal strength of the other portion in order to quickly discharge the steam out of the bag to prevent the seal rupture of the package.

However, as shown in FIG. 9, the point where the shortest distance r3 from the center of a bag to a point seal part becomes shorter than the shortest distance r1 from the center of the bag to the inner edge of any of the peripheral seal parts. By forming a seal part, even if the seal strength of a point seal part and another part is the same, the tearing of the bag of a packaging bag can be prevented.

In the case of integrally sealing by connecting the vapor passage means, the side seal portion and the bottom seal portion, the seal strength of these portions is 23 N / 15 mm to 100 N / 15 mm at 23 ° C. and 5 N at 90 ° C. It is preferable that it is the range of / 15mm-25N / 15mm.

As the heat-adhesive resin which achieves such a seal strength, 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 copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer or ionomer and the like. It is especially preferable to use what consists of a resin composition which has a propylene ethylene block copolymer resin as a main component.

The sealant layer can form these thermal adhesive resins on a laminated surface such as a base material layer or an aluminum layer by an extrusion laminating method. In addition, it may form into a film beforehand by the T-die method, the inflation method, etc., and after that, you may laminate | stack by the lamination | stacking surface of another layer, a dry laminate, or a sandwich lamination method.

About 10 micrometers-100 micrometers are preferable, and, as for the thickness of a sealant layer, 40 micrometers-70 micrometers are more preferable.

As an adhesive for dry lamination, a urethane adhesive, a vinyl adhesive, an acrylic adhesive, an epoxy adhesive, etc. can be used. The coating amount may be appropriately set so that the thickness of the adhesive becomes 0.1 g / m 2 to 10 g / m 2, more preferably 1 g / m 2 to 5 g / m 2 as a dry film.

In addition, arbitrary thermoplastic resins can be used as adhesive resin for sandwich laminates. Moreover, as the layer thickness, Preferably it is about 10-30 micrometers.

<3> bag manufacturing

The microwave heating bag of the present invention is formed by heat-sealing the short edges of the left and right sides of the front and rear two-side wall film using the laminated film described above to form a side seal portion, and in some cases, the wall surface. It is formed by forming the bottom seal part by heat-sealing the bottom part in a gusset-shaped seal pattern formed by folding the bottom film inwardly, by independently or connecting with the side seal part on at least one side of the film. It can manufacture by doing.

Next, the sealed package can be manufactured by heat-sealing the upper end part after filling the contents and forming a top seal part.

Moreover, it is preferable to form the notch in the edge of the side seal part of a bag.

<4> means for easily passing steam

In one aspect of the present invention, the means for easily passing steam may be made of, for example, a point seal portion connected to a side seal portion or a top seal portion, an unbonded portion in the point seal portion, and at least one cut or cut. .

In another aspect, the vapor passage facilitating means communicates with a point seal portion connected to the side seal portion or the top seal portion, an unbonded portion within the point seal portion, and the non-adhesion portion, and the side seal portion or the top seal portion. It may consist of the micro sealing part formed in the.

In another aspect, the vapor passage facilitating means may include a point seal portion formed independently of the side seal portion or the top seal portion, an unbonded portion in the point seal portion, and at least one cut or cut.

Since the seal width of the point seal part 12 can be peeled off smoothly by the internal pressure by heating, Preferably it is 2 mm-5 mm.

In addition, the seal width of the side seal part 6, the bottom seal part 7, and the top seal part 8 should just be arbitrary width according to the weight etc. of contents, and should just be 6 mm-about 20 mm, for example.

<5> Boyle sterilization treatment, retort sterilization treatment

The microwave heating bag of the present invention can also be used as a package for retort sterilization treatment that can withstand a voile sterilization treatment or a retort sterilization treatment.

As the Boyle sterilization treatment or the retort sterilization treatment method, for example, using a normal retort kiln, about 95 ° C to 135 ° C, preferably around 120 ° C, 1 to 4 kgf / cm 2 · G, preferably 2.1 kgf / Cm 2 · G before and after, about 5 minutes to 120 minutes, preferably 30 minutes to heat and pressure treatment method, or 90 to 100 ℃, preferably around 90 ℃, about 5 to 20 minutes, preferably 10 It can carry out by the method of a process of a boiler before and after minutes. As a result, the contents can be subjected to heat sterilization or heat sterilization cooking.

<6> uses

The contents filled in the microwave heating bag of the present invention may be either solid or liquid. For example, solid foods such as frozen steamed dumplings, curry, soups, soy sauce, sauces, broths, spices, cooking liquors, fruit juices, and various liquid foods such as water and food and drink can be packed.

In addition, since the bag for microwave heating of the present invention can be self-supporting, it can be heated and cooked in a microwave for a predetermined time as it is in a self-supporting state, and the filling aptitude of the contents is excellent, and the display effect at the shop is also excellent.

Next, an Example is given and this invention is demonstrated concretely.

(Example)

Example 1

Aluminum foil (7 micrometers) was dry laminated on one surface of the polyester film (Unichika make, PET PET, thickness 16 micrometers) through the 2-liquid curable urethane type adhesive agent, and the aluminum thin film was formed.

Subsequently, the resist composition was gravurely printed at a predetermined position on the aluminum thin film to form a resist layer (1 to 2 µm).

Using this resist layer as a mask, the aluminum thin film was etched in an etching solution (ferric chloride) to form an approximately rectangular (98 mm x 132 mm) rounded aluminum layer.

After the resist layer was removed, washed with water and dried, a barrier film (IB-PET-RB manufactured by Dainippon Printing Co., Ltd., IB-PET-RB, thickness 12 µm) was dry laminated on the aluminum layer via a two-liquid curable urethane adhesive. A non-stretched polypropylene film (Toray Film processing manufactured Topan NO ZK93FM, thickness 60 µm) was dry laminated via an adhesive to prepare a laminated film constituting the wall film.

Moreover, the laminated | multilayer film which comprises a barrier film and an unstretched polypropylene film in this order was dry laminated on one surface of the same polyester film as the above via a 2-liquid curable urethane type adhesive agent, and produced the bottom film.

The laminated | multilayer film for wall surface films obtained above was cut into rectangular shape of 155 mm x 147 mm at the suitable position, and two wall surface films were prepared. In this wall film, the upper edge and the left and right edges of the substantially rectangular aluminum layer are respectively located 7 mm from the upper edge and the left and right edges of the wall film, and the lower edge is 50 mm from the lower edge of the wall film. Located.

Moreover, the laminated | multilayer film for bottom films obtained above was cut into the rectangle of 80 mm * 147 mm, and one base film was prepared.

Using these two wall films and one bottom film, the left and right edges were heat-sealed with a seal width of 10 mm, and the bottom part was heat-sealed in a seal pattern with a rounded bottom, and a standing pouch-shaped microwave oven according to the present invention. A heating bag was prepared. The heat seal was performed on the conditions of the temperature of 205 degreeC, the pressure of 2 kg / cm <2>, and time 2 second using the heat sealer (made by tester industry).

In the obtained heating bag, 180 g of curry containing many spices and oil were filled, and the upper edge was heat sealed with a seal width of 10 mm and sealed. This was subjected to a retort sterilization treatment under a condition of 20 minutes at a pressure of 2.1 kg / cm &lt; 2 &gt; and a temperature of 120 DEG C using a steam-type retort sterilization kiln to prepare a packaged product after the retort sterilization treatment was completed. In this packaged product, the upper edge and the left and right edges of the aluminum layer are embedded in the top seal and the side seal, respectively. In addition, when the packaged product is left still, the upper surface of the curry is located at a position higher than the lower edge of the aluminum layer.

[Example 2]

In the same manner as in Example 1, the microwave heating bag of the present invention was prepared. However, as shown in FIG. 6, a means for easily passing steam (25 mm in length X 15 mm in width, 3 mm in seal width, and 8 mm in diameter in cutout) is formed on one side of the bag so that the aluminum layer does not exist around it. Etching was performed.

In the obtained microwave heating bag of the present invention, 180 g of curry containing many spices and oil were filled, and the upper edge was heat-sealed and sealed with a seal width of 10 mm. This was subjected to the retort sterilization treatment in the same manner as in Example 1 to prepare a packaged product after the retort sterilization treatment.

Comparative Example 1

In the same manner as in Example 2, except that the wall film did not have an aluminum layer, a bag for microwave heating was prepared, a curry was filled, a retort sterilized treatment after sealing, and a retort sterilized packaged product was manufactured. It was.

Comparative Example 2

In the same manner as in Example 2, a microwave heating bag was prepared, the curry was filled, and after sealing, a retort sterilization treatment was performed and a retort sterilization finished packaged product was produced.

However, in the wall film, the aluminum layer has a size of 90 mm x 105 mm, and the upper edge is located 30 mm from the upper edge of the wall film, and the left and right edges are each 11 from the left and right edges of the wall film. It is located inside the mm, and the lower edge is located 50 mm from the lower edge of the wall film, and thus, the edges of the aluminum layer are not all embedded in the seal portion.

[evaluation]

Retort aptitude

The following data was measured about the microwave oven heating bag of Example 1, 2 and Comparative Examples 1, 2.

(1) appearance change after retort

The change in appearance after 120 ° C. × 30 minutes of retort treatment was observed.

(2) dropping strength

After the retort sterilized packaged product prepared by the above method is stored at 3 ° C. for 1 week, the retort sterilized product is dropped into the concrete surface at a height of 120 cm one time (two times) in the horizontal and vertical directions (breaking the bag) and the contents. Was checked for leakage.

(3) piercing strength (N)

The retort-sterilized packaged product produced by the above method was subjected to a KETTECH KES-G5 handy compression tester at a measurement temperature of 25 ° C. under a condition of a radius of curvature of 0.5 mm at the tip of the needle and a puncture speed of 50 mm / min. The puncture test was performed toward the inside from the outside of the bag, and the maximum puncture load was defined as the puncture strength (N).

About the microwave oven heating bag of Example 1, Example 2, and the comparative example 2, the piercing strength of the part in which an aluminum layer does not exist in the wall film was measured.

(4) seal strength

After the retort treatment, the seal portion was cut out to a sample width of 15 mm, and tested by a tensile tester (manufactured by Shimadzu Corporation) according to JIS-Z1707 (tension speed: 300 mm ± 20 mm / min, peel angle: 90 °), Seal strength at 23 ° C. and 90 ° C. was measured.

The results are shown in Table 1.

Microwave oven aptitude

10 bags of microwave heating bags of Examples 1 and 2 and Comparative Examples 1 and 2 were prepared, respectively, and the time at which steam was released after heating in the microwave oven, the flavor change of the contents by microwave heating, and the electrons The external appearance after range heating was investigated and evaluated. All heating by the microwave oven was performed for 2 minutes.

The results are shown in Table 2.

In all 10 bags of the microwave oven heating bags of Examples 1 to 2, there was no change in the flavor of the contents and the appearance of the bags even after the microwave heating. In contrast, the microwave heating bag of Comparative Example 1 was dried for 2 minutes after the contents of the contents were evaporated. In 6 out of 10 bags, the upper surface of the contents and the inner surface of the bag were burned and pressed, and melting of the sealant occurred to change the flavor. In addition, the bag for microwave heating of the comparative example 2 was pressed by the contact part of the inner edge of a side seal part, and the upper end surface of the content in 4 bags out of 10 bags, and the sealant melt | dissolved and the flavor changed.

1: wall film
1a: wall film (front)
1b: wall film (rear)
2: aluminum layer
2a: top edge of aluminum layer
2b: Lower edge of aluminum layer
2c: left edge of aluminum layer
2d: right edge of aluminum layer
3: bottom film
4: base material layer
5: sealant layer
6: side seal part
7: bottom seal part
8: top seal part
9: height at which the top surface of the contents is located
10: notch
11: steam passage means
12: part of the point seal
13, 16: Missile part
14: notication
15: protrusion
17: infeed
18: barrier film layer
20: microwave heating bag
30: microwave heating bag
40: microwave heating bag

Claims (8)

A body part which is formed by heat-sealing short edges of left and right sides of the front and rear two side wall films to form a side seal part,
As a bag for microwave heating which consists of a bottom part formed by folding a bottom film inwardly between the lower parts of the said front and back two surface wall films, and forming a bottom seal part by heat-sealing a peripheral part in a gusset-shaped seal pattern ,
The front and rear two side wall films are made of a laminated film having a base material layer, an intermediate layer, and a sealant layer serving as the innermost layer.
The intermediate layer is made of an aluminum layer partially formed by an aluminum etching technique,
The edge of the aluminum layer is retracted inward from the edges of the base material layer and the sealant layer so as not to be exposed to the end face of the wall film, and the left and right edges are embedded in the side seal portion, and the upper edge thereof is And the upper edge of the filled contents is formed to be higher than the height at which the top surface is located, and the lower edge thereof is formed to be lower than the height at which the upper surface of the contents is located. The method of claim 1,
The top edge of the aluminum layer is embedded in the top seal portion formed on top of the wall film after filling the contents, microwave oven heating bag. 3. The method according to claim 1 or 2,
The seal strength of a seal | sticker part exists in the range of 23 N / 15 mm-100 N / 15 mm at 23 degreeC, and 5 N / 15 mm-25 N / 15 mm at 90 degreeC. The method according to any one of claims 1 to 3,
At a position higher than the height at which the top surface of the filled contents is located, to form a means for easily passing steam for discharging steam, and there is no aluminum layer in the means for easily passing the steam and around it. Microwave heating bag. The method of claim 4, wherein
The means for easily passing steam comprises a point seal portion formed in connection with or independently of the side seal portion or the top seal portion, a miss seal portion formed inside the point seal portion, and at least one cut or cut in the miss seal portion. Microwave heating bag. The method of claim 5, wherein
The shortest distance from the center of a bag to a point seal part is shorter than the shortest distance from the center of the bag to the inner edge of any of a side seal part, a bottom seal part, and a top seal part. 7. The method according to any one of claims 1 to 6,
A microwave heating bag, characterized in that the packaging bag for the retort sterilization treatment capable of withstanding the Boyle sterilization treatment or the retort sterilization treatment. The method according to any one of claims 1 to 7,
The periphery of an aluminum layer is comprised from a straight line and a curve, and has no angle | corner.

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