JPH0722984U - Sealed packaging bag - Google Patents

Abstract

(57) [Abstract] [Purpose] Suitable as a bag for hermetically sealing frozen foods that can be heated in a microwave oven as it is, and as a hermetically sealing bag for cold storage / heat storage agents, which can eliminate the internal high pressure state during heating. To provide a sealed packaging bag. [Structure] One or a plurality of air vent valves are adhered to the front surface or the back surface of a bag body made of a single body or a laminated plastic film / sheet and a laminated plastic film / sheet containing a non-woven fabric by heat welding or the like to form an inside of the bag body. A hermetically sealed packaging bag which is attached to a heat seal layer and is formed by three-way heat sealing or four-way heat sealing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a packaging bag for hermetically packaging foodstuffs or other substances containing moisture and vaporizable materials. More specifically, the invention relates to a packaging bag, which is mainly used in a household electronic range to generate heat by microwaves. The present invention relates to a bag that can be heated and sealed, such as a frozen food product, and a sealed packaging bag that is suitable as a sealed packaging bag for a cold / heat storage agent and that can eliminate the internal high-pressure state during heating.

[0002]

[Prior art]

 Traditionally, side dishes, frozen foods, etc. have been equipped with a zipper that can be opened or closed, or stored in a packaging bag that does not have them, sealed, transported, manufactured and sold, and heated in a microwave oven when used. ing.

In recent years, a regenerator made of a compound such as carboxymethyl cellulose (cellulose glycol) is put in a bag of a laminate film / sheet and hermetically sealed, which is then frozen and frozen. It is widely used as a cooling and refrigerating medium for home use. This utilizes the cold storage effect, but as already known, when heat is supplied to the cold storage agent, it exerts a heat storage effect and can be used as a heat storage agent. As a method of heating this cold storage (also used as heat storage) agent, there is a hot water boiling method using high temperature hot water. Further, a method of heating for a short time using a microwave oven is conceivable. In the former case, a heat storage bag at 65 to 80 ° C can be obtained by putting it in boiling hot water for 15 to 30 minutes.

[0004]

[Problems to be solved by the device]

 Put the former sealed food bag containing frozen food, etc. directly into a microwave oven or an oven to heat it, or the latter sealed air-tight packing bag to prevent leakage of the cold storage (and heat storage) agent. When heated in a microwave oven, the water content in the bag rapidly evaporates in 90 to 120 seconds, causing the bag to become a high-pressure state and breaking the bag. As a result, in the latter case, the latter is used as a heat storage agent. The result is that the bag does not function as a bag.

An object of the present invention is to provide a hermetically sealed packaging bag which does not have the above-mentioned drawbacks, and further, a hermetically sealed packaging suitable as a packaging bag in which a cold storage agent can be used as an agent for storing heat. It is intended to supply bags.

[0006]

[Means for Solving the Problems]

 The present invention provides one or a plurality of holes on the front surface or the back surface of a bag made of a single film or a laminated film / sheet and a laminated film / sheet containing a non-woven fabric, and air-removing so as to cover the hole. The valve is attached to the heat-sealing layer inside the bag, and is characterized by being three-way heat-sealing or four-way heat-sealing so that a rapid high-pressure condition in the sealed packaging bag can be eliminated.

1) Examples of the packaging material used in the present invention include simple, low-density, medium-density, high-density, linear polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-acetic acid. Examples thereof include vinyl copolymers, polyvinyl chloride, ionomers, ethylene / acrylic acid copolymers, ethylene / methacrylic acid copolymers, ethylene ethyl acrylate copolymers and ethylene / methyl acrylate copolymers.

2) As the base film / sheet of the laminated film used in the present invention, biaxially oriented polypropylene film, biaxially oriented polyester film, biaxially oriented nylon film, polyvinylidene chloride coat, etc. There is an axially stretched film. The heat seal layer used in the present invention is made of various polyethylene, polypropylene, ethylene / vinyl acetate copolymer, ionomer, ethylene / acrylic acid copolymer, ethylene methacrylic acid copolymer, ethylene / ethyl acrylate copolymer and Examples thereof include ethylene / methyl acrylate copolymer.

3) As the paper to be laminated as the laminated film sheet of the present invention, paper made from vegetable fiber and synthetic paper made from polyethylene, polypropylene, polystyrene, polyester or nylon can be used. Nonwoven fabric materials include polyester, rayon, nylon, polypropylene, vinylon, polyethylene, acrylonitrile and polyurethane.

The hermetically sealed packaging bag of the present invention using the above single film sheet or laminated film sheet is a three-sided seal bag or a four-sided seal bag that can be filled with contents with the heat seal layer side inside. It is preferably shaped.

The manufacturing method of the laminated film / sheet used here is a method of laminating various heat-sealing layers with various kinds of plastic films, paper, and non-woven fabric as a base material film via an adhesive layer, and the above-mentioned base material film. Similarly, a method of extrusion-coating a molten resin as a heat-sealing layer via an adhesive layer, and a method of laminating another heat-sealing film layer in a sandwich shape via a molten resin are also suitable. As the adhesive layer, the former is preferably a solvent or solventless type one-component or two-component reaction-curing urethane adhesive, and the latter is preferably an isocyanate type, polybutadiene type, polyethyleneimine type or organic titanium type. .

Furthermore, it is also possible to print on the front surface or the back surface of the above-mentioned base plastic film, paper or nonwoven fabric for use. The air release valve used here is a mechanism in which the valve body is made of polyolefin resin and operates when the pressure is constant. A hole of about 5 to 15 mm is formed on the front surface or the back surface of the bag body, and at that position, the flange of the air bleeding valve is heat-sealed from the inside of the bag body to the heat-sealing layer of the bag body, an adhesive, a high frequency wave. , Ultrasonic wave is used to bond and fix the bonded part in an airtight state. The number of valves to be attached is preferably one or two or more depending on the size of the bag.

[0013]

[Function] When the moisture in the contents evaporates due to heating and the inside of the bag becomes high in pressure, the high-pressure steam inside is discharged from the air vent valve, and the high-pressure state inside the bag is eliminated.

[0014]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments.

Example 1. In FIG. 1, a biaxially stretched film layer 1 made of a biaxially stretched nylon film having a thickness of 15 μm as a transparent substrate is used as a base film, and a solvent-type two-component reaction-curing urethane adhesive layer 2 is used to interpose a line having a thickness of 70 μm. Heat-sealing layer 3 made of a polyethylene (L.LDPE) film was laminated.

Next, using a three-way seal type automatic bag making machine, a bag body 10 sealed in three directions is manufactured, and two air removal valves 20 are heated on the front surface 11 or the back surface 12 of the bag body 11 here. It was prepared by sealing and mounting (Fig. 4). A gel-like cold storage agent (also serving as a heat storage agent) was placed in this bag, and the mouth was heat-sealed and sealed. This bag was placed in a microwave oven (oscillation frequency: 2,450 MHZ, 1,000 W) and heated for 5 minutes or more, but the bag did not break and could be used as a heat storage agent bag.

After the temperature was further lowered, the same bag was put in a freezer to be frozen and used as a regenerator bag.

Further, when a frozen food (edamame) was filled and sealed instead of the above-mentioned agent for cold storage / heat storage, the bag was not broken by heating for 3 minutes, and it could be heated to an appropriate temperature.

Example 2. As shown in FIG. 3, as a transparent base material, a biaxially stretched film layer 4 of a nylon film having a thickness of 15 μm was provided with an isocyanate adhesive layer 5 and an extruded resin layer 6 made of melt extruded polyethylene and having a thickness of 20 μm. A rayon-based non-woven fabric layer 7 is laminated in a sandwich form, and a nylon film of the obtained laminated film is biaxially stretched on the layer 4 side, and an adhesive layer 8 made of a solvent-type reaction-curable urethane is placed between A heat seal layer 9 of a 0 μm linear polyethylene (L·LDPE) film was laminated.

Next, the laminated film was heat-sealed in three directions using a three-way seal type automatic bag-making machine so that the linear polyethylene was on the inner surface of the bag. An air removal valve 20 was attached to the surface 11 (FIG. 2) and prepared. A gel-like cold storage agent (also serving as a heat storage agent) was placed in the bag body 10, and the mouth was heat-sealed and sealed. The bag was put in a microwave oven (oscillation frequency: 2,450 MHZ, 1,000 W) and heated for 5 minutes or more, but the bag did not break and could be used as a heat storage agent bag. Furthermore, after cooling, the same bag was put in a freezer to be frozen and used as a regenerator.

In both the first and second embodiments, as shown in FIG. 4, the air vent valve 20 has a plurality of insertion holes 22 formed in the bottom of a dish-shaped valve body 21 located inside the bag. A circular film 23, which is an extremely thin valve body, is placed so as to cover the insertion hole 22, and a holding plate 24 having two protrusions 25 for fixing the circular film 23 on the front and back sides is provided. Arc-shaped notches 28 and 28 are provided on both sides of the protrusion 25 of the holding plate 24, and the flange 26 of the main body 21 is attached to the front surface 11 or the rear surface 12 of the bag body, and the front surface 11 in the embodiment. It is heat-sealed and fixed to the innermost heat-sealing layer 3 (, 9). The valve body 23 made of the circular film 23 is pressed in the direction of the notch of the holding plate 24 by the high-pressure steam inside the bag body, the insertion hole 22 is opened, and the high-pressure steam inside the bag body 10 is transferred to the bag body 10. It is discharged from the hole 27 provided on the surface 11 of the.

[0022]

[Effect of device]

 In the present invention, since the air removal valve is attached to the front surface or the back surface of the three-side sealed bag or the four-sided sealed bag, the contents can store heat without breaking even in a sudden high pressure state in the bag.

Therefore, it is suitable as a bag body for hermetically packaging frozen foods and the like that can be heated in a microwave oven as it is and a hermetically packaging bag for a cold / heat storage agent. By attaching an air vent valve to the regenerator bag, a new function as a regenerator bag is added to the regenerator bag, producing a high product value as a hermetically sealed package bag for both regenerator and heat store. When it is intended for cooling, it can be used as a cold storage bag, and when it is intended to keep warm, it can be used as a heat storage bag, and it is also possible to reuse both functions alternately.

[Brief description of drawings]

FIG. 1 is a sectional view of an example of a laminated film sheet used in the present invention.

FIG. 2 is a perspective view of the hermetically sealed packaging bag of the present invention.

FIG. 3 is a cross-sectional view of an example of a laminated film sheet used in the present invention.

4 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1,4 Biaxially stretched film layer 2,5,8 Adhesive layer 6 Extruded resin layer 7 Nonwoven fabric layer 3,9 Heat seal layer 10 Bag body with three sides sealed 11 Front surface 12 Back surface 20 Air removal valve 21 Valve body 22 Insertion hole 23 circular film 24 holding plate 25 projecting 26 flange 27 hole 28 notch

Claims (1)

[Scope of utility model registration request] 1. A single or laminated plastic film sheet, and a laminated plastic film including paper and non-woven fabric.
One or a plurality of holes are provided on the front surface or the back surface of the bag made of a sheet, and an air vent valve is attached to the heat seal layer inside the bag so as to cover the holes, and three-way heat sealing or four-way heat A hermetically sealed packaging bag characterized by being sealed.