JPH0880978A - Pouch for retort - Google Patents

Abstract

PURPOSE: To provide a pouch for retort which can impart a heat, using a microwave heater, to foodstuffs having been treated by means of a retort. CONSTITUTION: A bag body 11 comprises a laminated film which is formed of a surface layer comprising a heat-resistant plastic film and a rear layer comprising a heat-resistant plastic film, and a twice-folded heat-resistant nonwoven fabric 12 is attached to the inner layer of the bag body 11 near one of the ends thereof so as to be sealed by the end edge portions 13 of the fabric 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouch for a retort which can heat a food after retort treatment with a microwave oven.

[0002]

2. Description of the Related Art In recent years, food processing technology and packaging technology have progressed, and foods packaged in pouches that have been heated and sterilized under pressure in a retort kettle have become widespread.

By the way, this retort-treated food is
When eaten by consumers, they are often subjected to heating by a microwave oven.

The heating in the microwave oven vibrates water molecules and the like contained in the food by irradiation of high frequency (ultra-short wave), and heats the food by frictional heat generated by the vibration of the water molecules and the like. .

With the high-frequency heating in this microwave oven,
Water vapor is generated from food. As a result, when food is put in a sealed bag and heated in a microwave oven, the sealed bag expands and eventually bursts.

Therefore, in the conventional retort pouch, the retort-treated food placed in this pouch cannot be directly heated by a microwave oven.

[0007]

Therefore, in the present invention, a pouch for a retort, and when the retort food is heated by a microwave oven when eating,
Water vapor generated from food is released to the outside of the sealed bag to prevent the bag from bursting, and by using a non-woven fabric with appropriate breathability, an appropriate internal pressure effect is produced and the contents are fluffy in a short time. Delicious and microwaveable.

[0008]

The above object is achieved by the following pouch for retort according to the present invention. That is, the pouch for retort of the present invention is a heat-resistant pouch folded in two inside a sealing bag made of a laminated film having a surface layer made of a heat-resistant plastic film and a back layer made of a heat-resistant plastic film. The non-woven fabric is attached by being sealed at the edge of the non-woven fabric.

In the sealed bag, the back surface layer of the laminated film is used as the inner peripheral surface layer of the bag.

In the retort pouch of the present invention, a notch is provided near the end of the non-woven fabric-attached portion of the sealed bag, and the non-woven fabric is provided in addition to the notch in the hermetically sealed bag. A notch is provided on at least one of the opposite side of the notch and the other end side of the sealing bag.

Further, in the retort pouch of the present invention, the hermetically sealed bag has a stretched nylon film (surface layer), a polyvinylidene chloride resin layer or a polyethylene-vinyl alcohol copolymer resin layer, and an unstretched polypropylene film (in the order from the surface layer). The back surface layer) is formed by using a laminated film having a laminated constitution, and a polypropylene fiber nonwoven fabric is used as the heat resistant nonwoven fabric.

[0012]

In the pouch for a retort according to the present invention, the pouch for a retort is folded in two inside a sealed bag made of a laminated film having a surface layer made of a heat-resistant plastic film and a back layer made of a heat-resistant plastic film. A heat-resistant non-woven fabric is arranged, and the non-woven fabric is attached to the inner surface of the hermetically sealed bag with its edge portion sealed.

Therefore, in the pouch for retort according to the present invention,
The laminated films are heat-sealed to each other on the end side of the sealed bag to which the heat-resistant nonwoven fabric is attached.

Therefore, food is filled from the end side of the sealed bag where the non-woven fabric is not attached, and the end is heat-sealed, vacuum-sealed, and subjected to retort treatment.

When the retort-processed food is put in a microwave oven and heated, the end of the sealed bag on which the non-woven fabric is attached is cut off to open the end on the non-woven fabric-attached side. , And then put the food together with the bag in the microwave and heat.

As a result, the steam generated from the heated food permeates the non-woven fabric and escapes to the outside, so that the problem that the bag is ruptured by the steam generated from the food can be completely eliminated.

Since the retort pouch of the present invention is attached to the inner surface of the hermetically sealed bag made of the laminated film by heat-sealing the folded heat-resistant nonwoven fabric at the edge of the nonwoven fabric, It can be manufactured using the bag machine as it is.

Therefore, the pouch for a retort according to the present invention can be mass-produced without requiring special equipment, and can be supplied at a low price.

Further, the pouch for retort according to the present invention is provided with a notch near the end of the portion of the sealed bag to which the heat-resistant nonwoven fabric is attached, and in addition to the notch, the notch is sandwiched between the nonwoven fabrics. At least one of the other side of the sealed bag and the other end of the sealed bag is provided with a notch, and the portion of the sealed bag can be cut out according to these notches to be used, so that usability can be improved.

Further, in the pouch for retort according to the present invention, a hermetically sealed bag is laminated by a laminated constitution of a stretched nylon film, a polyvinylidene chloride resin layer or a polyethylene-vinyl alcohol copolymer resin layer, and a non-stretched polypropylene film in this order from the surface layer. Since it is formed using a film and polypropylene fiber non-woven fabric is used as the heat resistant non-woven fabric, the heat-sealing property between the non-stretched polypropylene film, which is the inner surface of the laminated bag, that is, the inner peripheral surface of the sealing bag, and the heat resistant non-woven fabric is used. Therefore, the bag-making machine for stand packs can be used for efficient bag-making.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific construction of the pouch for retort according to the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the pouch for a retort according to the present invention, FIG. 2 is an enlarged sectional view taken along the line AA of FIG. 1, and FIG. 3 is a structure of a laminated film forming a bag body. It is an expanded sectional view which shows typically.

In the embodiments shown in FIGS. 1 to 3, a heat-resistant non-woven fabric 12 is disposed inside one end portion of a bag body 11 of a hermetically sealed bag made of a laminated film, and the non-woven fabric 12 has its edge. It is attached to the bag body 11 while being sealed.

The laminated film, which is the material of the bag body 11, comprises at least a surface base material layer and a seal layer.

As the surface base material layer, it is preferable to use a material having good printability and heat resistance such as a stretched polyethylene terephthalate film, a stretched nylon film, a stretched polypropylene film, a polyvinylidene chloride resin layer or a polyethylene-vinyl resin layer. It is more preferable to use a stretched polyethylene terephthalate film or a stretched nylon film on which a barrier layer such as an alcohol copolymer resin layer is laminated, because a barrier property can be obtained.

When it is desired to impart barrier properties to the bag body 11, for example, a laminated film obtained by laminating a barrier film such as a silica vapor deposition film, an alumina vapor deposition film, a magnesium oxide vapor deposition film or a saran film as an intermediate layer. You may use it.

As the seal layer, linear low density polyethylene or unstretched polypropylene film is suitable.

Further, as the laminated film which is the material of the bag body 11, a film obtained by laminating a uniaxially stretched film which is easy to tear in parallel with the end portion where the heat resistant nonwoven fabric 12 is arranged is used to open the bag body 11. Can be made extremely easy.

The laminated films can be adhered to each other by dry lamination or the like.

As the material of the non-woven fabric 12, it is preferable to use one made of polypropylene-based or polyethylene-based fiber having good heat resistance. Specifically, a polyester-based fiber composed of polyester fiber coated with high-density polyethylene is used. Spunbond nonwoven fabrics are preferred.

Considering the heat-sealing properties of both, the bag 11 and the non-woven fabric 12 are made of a stretched nylon film 7, a polyvinylidene chloride resin layer or a polyethylene-in order from the surface layer as shown in FIG. It is preferable to use a laminated film composed of the vinyl alcohol copolymer resin layer 8 and the unstretched polypropylene film 9 as the material of the bag body 11, and to use the polypropylene fiber nonwoven fabric as the material of the heat resistant nonwoven fabric 12.

The non-woven fabric 12 is folded in two and placed inside the bag body 11, and is heat-sealed and attached inside the bag body 11 at the edge of the non-woven fabric 12. Reference numeral 13 indicates the heat seal portion.

Further, the bag body 11 is heat-sealed by the heat-sealing portion 14 on the three sides of the periphery, except for the opening 15 on the other end side of the bag body 11.

Further, the bag body 1 is further closer to the end portion of the bag body 11 where the non-woven fabric 12 is attached, after the retort treatment and before heating by the microwave oven.
A notch 16 for opening 1 is provided.

Then, food (not shown) is filled in the bag 11 through the opening 15, and then the opening 15 is heat-sealed.

In the pouch for retort constructed as described above, the nonwoven fabric 12 is attached to the inside of the bag body 11 and
Since the portion closer to the end of the attached portion of the non-woven fabric 12 is heat-sealed, it is possible to obtain the sealing property that can be subjected to the retort treatment.

When the food in the bag 11 after the retort treatment is heated by a microwave oven, the bag 11 is heated.
The bag body 11 is cut out from the notch 16 provided in the portion near the end of the attachment portion of the nonwoven fabric 12 in
The nonwoven fabric 12 is exposed.

Then, the food as it is in the bag 11 is put in the microwave oven and heated by high frequency.

Therefore, during this heating, water vapor generated from the food permeates the nonwoven fabric 12 and escapes to the outside.
It is possible to completely eliminate the problem that the bag body 11 is ruptured by the steam generated from the food by heating the microwave oven.

In this embodiment, the non-woven fabric 12 folded in two is formed on the inner surface of the bag 11 made of a laminated film.
Since the non-woven fabric 12 is heat-sealed and attached at the edge of the non-woven fabric 12, the sealed bag having such a structure can be manufactured by using a commonly used stand-pack bag making machine as it is.

Next, FIG. 4 is a sectional view of the essential parts showing another embodiment of the pouch for retort according to the present invention.

In the embodiment shown in FIG. 4, as can be seen from comparison with FIG. 2, the non-woven fabric 12 is attached in the opposite direction. The other structure is the same as that of the embodiment shown in FIGS. 1 and 2, and the operation is also the same.

Next, FIG. 5 is a plan view showing another embodiment of the present invention. In the embodiment shown in FIG. 5, in the bag body 11,
Notches 17 and 18 for opening at the time of taking out the food after heating by a microwave oven are provided at a position on the opposite side of the notch 16 with the non-woven fabric 12 and a position on the opening 15 side of the bag body 11, respectively. Has been.

In this embodiment, the food is heated in the microwave oven together with the bag 11 and taken out from the microwave oven.
Since the food can be taken out by opening the bag 11 from at least one of the notches 17 and 18, the food can be easily taken out from the bag 11.

In the embodiment shown in FIG. 5,
The notches 17 and 18 may be either one.

Example 1 As a material for the bag body 11 of the sealed bag, a polyvinylidene chloride resin layer surface of a biaxially stretched nylon film (15 μm) coated with a polyvinylidene chloride resin layer was coated on the surface of the polyvinylidene chloride resin layer with unstretched polypropylene. Film (70μ
A laminated film obtained by dry laminating a seal layer composed of m) was used, and a polypropylene fiber non-woven fabric was used as the heat-resistant non-woven fabric 12 to obtain a pouch for a retort having an opening 15 in a bag.

In the retort pouch, corn that had been dipped in 10 wt% saline for 2 seconds was placed, and the opening 1
After heat-sealing No. 5 and vacuum packaging at the same time, 2.0 atm, 120 ° C., pressurization for 25 minutes, with a retort kettle,
Heating was performed.

After cooling sufficiently, by cutting the end side of the hermetically sealed bag to which the non-woven fabric is attached from the notch 16 provided in the portion near the end of the attachment part of the non-woven fabric 12 in the bag body 11. , Open the end on the non-woven fabric side to expose the non-woven fabric 12, then 600
When heating was performed for 5 minutes and 10 minutes with a microwave oven of W, neither pouch had a ruptured bag and the inner surface was fused, and the escape of water vapor was complete.

Furthermore, a proper internal pressure is applied to the contents, and in a shorter time than in the case where a conventional pouch for retort is used,
I was able to heat the fluffy whole.

Example 2 As a material for the bag body 11 of the sealed bag, a polyethylene-vinyl alcohol copolymer resin layer was coated 2
A laminated film in which a seal layer made of an unstretched polypropylene film (70 μm) is dry laminated on the surface of a polyethylene-vinyl alcohol copolymer resin layer of a surface base material made of an axially stretched nylon film (15 μm) is used. As No. 12, a polypropylene fiber non-woven fabric was used to obtain a pouch for a retort having an opening 15 in the bag.

In the retort pouch, corn that had been dipped in 10 wt% saline for 2 seconds was placed, and the opening 1 was opened.
After heat-sealing No. 5 and vacuum packaging, pressurize at 2.0 atm, 115 ° C. for 60 minutes in a retort kettle,
Heating was performed.

After cooling sufficiently, by cutting the end side of the hermetically sealed bag to which the non-woven fabric is attached from the notch 16 provided in the portion near the end of the attachment part of the non-woven fabric 12 in the bag body 11. , Open the end on the non-woven fabric side to expose the non-woven fabric 12, then 600
When heating was performed for 5 minutes and 10 minutes with a microwave oven of W, neither pouch had a ruptured bag and the inner surface was fused, and the escape of water vapor was complete.

Furthermore, a proper internal pressure is applied to the contents, and in a shorter time than when a conventional pouch for retort is used,
I was able to heat the fluffy whole.

[0054]

According to the pouch for a retort according to the invention described in claim 1 described above, one end of a sealed bag made of a laminated film having a surface layer made of a heat-resistant plastic film and a back layer made of a heat-resistant plastic film. A heat-resistant non-woven fabric folded in two is attached to the inside of the part by sealing at the edge of the non-woven fabric, and food is filled from the end side of the hermetically sealed bag where the non-woven fabric is not attached. Part is heat-sealed and completely sealed.

Therefore, retort processing is possible,
Moreover, when eating food after retort treatment, when putting in a microwave oven and heating, cut out the end side of the sealed bag on which the non-woven fabric is attached, expose the non-woven fabric by opening the end on the non-woven fabric side, After that, the food is put in a microwave oven together with the bag and heated.

Therefore, the steam generated from the heated food permeates the non-woven fabric and escapes to the outside, which has the effect of completely eliminating the inconvenience of the bag bursting due to the steam generated from the food.

Furthermore, since a non-woven fabric having an appropriate breathability is used, it has an appropriate vapor permeability and an internal pressure effect, and the contents can be steamed in a microwave oven in a fluffy and delicious manner in a short time. There is.

Further, in the pouch for retort according to the present invention, since the edge portion of the folded non-woven fabric is heat-sealed and attached to the inner surface of the sealed bag made of the laminated film, the bag machine for a stand pack can be used as it is. Since there is no need for special equipment, it can be mass-produced and can be provided at a low price.

According to the retort pouch of the second aspect of the present invention, the notch is provided further toward the end of the portion of the sealed bag to which the non-woven fabric is attached, and the pouch for the retort of the third aspect of the invention. According to the pouch, in addition to the notches, a notch is provided on at least one of the opposite side of the notch and the other end of the sealing bag by sandwiching the non-woven fabric. Since it can be cut and used, it has the effect of improving usability.

Further, according to the invention of claim 4, the hermetically sealed bag has a laminated structure of a stretched nylon film, a polyvinylidene chloride resin layer or a polyethylene-vinyl alcohol copolymer resin layer, and a non-stretched polypropylene film in order from the surface layer. Formed of a laminated film of a polypropylene fiber non-woven fabric as a heat-resistant non-woven fabric, the non-stretched polypropylene film which is the inner peripheral surface of the sealing bag by the laminated film and the polypropylene fiber non-woven fabric have good heat sealability, Therefore, there is an effect that the bag making machine for the stand pack can be used to efficiently perform bag making.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a retort pouch of the present invention.

2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged cross-sectional view schematically showing an example of a laminated film forming a bag body.

FIG. 4 is an enlarged cross-sectional view of essential parts showing another embodiment of the retort pouch of the present invention.

FIG. 5 is a plan view showing another embodiment of the pouch for retort according to the present invention.

[Explanation of symbols]

 7 ... Surface layer made of heat-resistant plastic film 9 ... Back surface layer made of heat-resistant plastic film 11 ... Bag 12 ... Heat-resistant nonwoven fabric 13, 14 ... Heat-sealed portion 15 ... Bag opening 16 ... Notch 17, 18 ... Notch for opening when removing heated food

Claims (4)

[Claims] 1. A heat-resistant non-woven fabric folded in two inside a hermetically sealed bag made of a laminated film having a surface layer made of a heat-resistant plastic film and a back layer made of a heat-resistant plastic film. A pouch for a retort, which is sealed and attached at the edge of a non-woven fabric. 2. The retort pouch according to claim 1, wherein a notch is provided at a portion of the hermetically sealed bag to which the non-woven fabric is attached, further closer to the end. 3. The sealing bag, in addition to the notch, is provided with a notch on at least one of the opposite side of the notch with a non-woven fabric sandwiched between the notch and the other end side of the sealing bag. The pouch for retort according to claim 2. 4. The laminated film has a laminated structure of a stretched nylon film, a polyvinylidene chloride resin layer or a polyethylene-vinyl alcohol copolymer resin layer, and an unstretched polypropylene film in this order from the surface layer, and the heat-resistant nonwoven fabric is polypropylene. The pouch for retort according to claim 1, which is a non-woven fabric made of fiber.