JPH0966943A - Wrapping film, and packaging bag made of wrapping film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wrapping film and a packaging bag made of such wrapping film that are available for use in heating food with a microwave oven with a proper amount of vapor remaining in the food without spoiling taste. SOLUTION: A wrapping film A is made up by sticking a moisture-permeable cellophane 2 with water to a plastic film 1 made up by forming a number of pores 4 with polyvinyl alcohol 3 applied to one side thereof at its side on which the polyvinyl alcohol is applied. A packaging bag B is constructed by forming the wrapping film into a cylindrical or a baglike shape with the moisture-permeable cellophane facing the inside, or by forming a laminated body C made up by sticking an olefine film 6 to a nonwoven fabric and the wrapping film into a cylindrical or a baglike shape with the nowoven fabirc side of the lanainated body and the moisture-permeable cellophane of the wrapping film respectively facing the inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging film for coating foods when they are heated by a microwave oven, a gas oven or the like, and for the purpose of preventing fog and freshness of agricultural products, and a packaging film formed therewith. The present invention relates to a packaging bag.

[0002]

2. Description of the Related Art Conventionally, in the case of heating food in a microwave oven or the like, if it is directly heated, water often dissipates from the food and becomes dry and hard, which often impairs the taste. In addition, the steam also evaporates oil, which contaminates the inside of the range and causes an offensive odor. For this reason, conventionally, when food is heated in a microwave oven, a gas oven, etc., it is generally performed after covering the food with vinylidene chloride wrap or polyethylene wrap.

However, although these wraps are airtightly adhered to the container, since the wrap itself has neither breathability nor moisture permeability, when heated, high temperature steam fills the wrap and the wrap expands and expands greatly to form a balloon shape. Finally, it bursts and scatters around, contaminating the inside of the range. Therefore, it is necessary to stop the heating before the burst. Further, when agricultural products such as mushrooms are preserved, moisture and gas generated from them are not permeated, so that the film is cloudy and transparent, and the freshness preservation state is not preferable.

[0004]

In order to remedy this drawback, there have been proposed a polyolefin film or a moisture-permeable cellophane paper having pores, a film obtained by laminating a polyolefin film and paper, and the like. Film or cellophane paper can release excess water vapor, but it is difficult to control the water content, and the plastic film cannot prevent the dew condensation phenomenon, and since it has holes, it is not hygienic because dust may enter from the outside. Also, cellophane paper alone is fragile and poor in durability.
In the case of a laminated film of polyolefin and paper, the hygroscopic force of paper is insufficient and the moisture permeability is insufficient, so that it tends to be in an over-humidified state, and since it is opaque, the inside cannot be seen through, which is inconvenient in use.

The present invention has been made in view of the above problems, and an object thereof is to heat food in a microwave oven.
Providing a packaging film that does not have anti-fog properties and a packaging bag that uses this packaging film while fear of causing a taste problem that can leave a proper amount of steam in food and heating it and storing agricultural products It can be heat-sealed to the prepared container and used as a lid material.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the means of the present invention is to open a large number of pores in a plastic film having one side coated with Poval, and to provide moisture-permeable cellophane paper or paper to the surface coated with Poval. It is also possible to stick a rayon-based non-woven fabric with water to obtain a packaging film and apply a heat-sealing agent to the surface of the moisture-permeable cellophane paper or the paper or rayon-based non-woven fabric of this packaging film, partially or on the peripheral edge or side edge. The moisture-permeable cellophane paper or paper or rayon-based nonwoven fabric may be formed into a tubular or bag-like shape by using such a film, or the olefin-based film, polyester film or nylon may be used as the nonwoven fabric. Non-woven fabric side of laminate laminated with film and side of moisture-permeable cellophane paper or paper or rayon type non-woven fabric of the above-mentioned packaging film There is to a lid member of the container is possible, and the resin molding obtained packaging bag is formed in a cylindrical shape or a bag shape in such a way that the inner surface.

The microwave oven in the present invention includes not only a microwave oven and a gas oven but also a gas oven, an electric oven and the like.

According to the present invention, even if food is coated or packaged and heated in a microwave oven, a part of the generated water vapor permeates through the pores of the plastic film, and a moisture-permeable cellophane paper or a paper or rayon system is used. Since the non-woven fabric has high moisture permeability, it can hold an appropriate amount of water vapor inside and absorbs condensed water even when cooled, so that dew condensation water does not adhere to the surface of the food and leaves an appropriate amount of water. It is possible to provide a heated food that sufficiently retains the taste of the food itself, and also when storing agricultural products, it is possible to coat or wrap them to maintain their freshness, and further, to cover the container, especially the container having a flange portion. It can be used as a material.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. A packaging film A is formed by laminating a plastic film 1 and a moisture-permeable cellophane paper 2 or paper or rayon-based nonwoven fabric. The plastic film is coated with Poval 3 on one side and a large number of pores 4 are perforated, and the moisture-permeable cellophane paper 2 or paper or rayon-based non-woven fabric is adhered to the Poval-coated surface with water.

The plastic film 1 is made of polyolefin film, polyethylene terephthalate film, nylon film, etc., and is made by coating Povar 3 on at least one side thereof. It is something that can be worn. Such a technique of perforating the plastic film 1 can be easily achieved by passing the plastic film 1 through a roll and a rubber roll on which thin needles are planted.

Poval 3 is a water-soluble resin which is well known in the technical field of this kind, and it is used as a plastic film 1.
Lightly coat one side of. A large number of pores 4 are perforated in the plastic film 1 coated with the poval 3 and the surface of the poval coated is wetted with water to give a moisture permeable cellophane paper 2
Alternatively, paper or rayon-based nonwoven fabric can be easily attached.

As the moisture-permeable cellophane paper 2, cellophane well known in this type of technical field can be widely used. Further, as the paper and rayon-based non-woven fabric, those known in the technical field of this kind can be used and are not particularly limited. Which of these moisture-permeable cellophane paper 2 or paper or rayon-based nonwoven fabric is used is arbitrary and is not limited at all.

The pores 4 are formed by perforating a large number of plastic films 1 coated with Poval 3 to maintain the water vapor permeability, and the pore diameter is not particularly limited, but the water vapor may be either too large or too small. There is a possibility that problems such as permeation, retention, and intrusion of foreign matter may occur, and the diameter is preferably about 1 mm to 5 mm, and holes are regularly or irregularly formed on the entire surface.

It is possible to use such a wrapping film A as it is for wrapping or covering, or as a lid material. However, using the film A, the moisture permeable cellophane paper 2 or paper or rayon-based nonwoven fabric is used as the inner surface. It is also possible to form a bag or cylinder by laminating or welding so that the packaging bag B can be obtained.

Further, the packaging film A is laminated or welded with a laminate C obtained by laminating an olefin film, a polyester film and a nylon film 6 on a non-woven fabric 5 to form a bag or a cylinder. The bag B can also be used, and in this case, the non-woven fabric 5 surface of the laminate C and the moisture permeable cellophane paper 2 of the packaging film A or the surface of the paper or rayon-based non-woven fabric are formed as inner surfaces.

When the packaging bag B is constructed as described above, the packaging film A is folded back or superposed on each other and the peripheral edges and side edges are bonded or welded to each other while leaving the opening. At this time, the heat-sealing agent 7 may be applied to the peripheral edge, the side edge, or a part of the surface of the moisture-permeable cellophane paper 2 or the paper or rayon-based nonwoven fabric of the packaging film A so as to facilitate the welding. Becomes The same applies to the case where the packaging film A and the laminated body C are welded together, and a resin-molded container, particularly a container molded with a polypropylene-based, polyethylene-based, polyester-based, polystyrene-based, or polyvinyl chloride-based resin, has a flange. The heat-sealing agent 7 is also effective when it is heat-sealed to a portion and used as a lid material.

The heat-sealing agent 7 may be of any type known in the technical field of this kind, and is not particularly limited, and the moisture-permeable cellophane paper 2 of the packaging film A having an appropriate size is used. Alternatively, it is applied to the peripheral edge or side edge of the surface of the paper or rayon-based non-woven fabric or partially.

As the adhesive for laminating the packaging film A, starch-based, polyurethane-based, vinyl acetate-based, chlorinated PP-based, and poval-based adhesives are suitable, and the gravure roll method is used as the method for applying the adhesive. General construction methods such as the above can be used.

As the shape of the bag, a flat bag (envelope type) or a gusset bag can be used. A flat bag is suitable for containing thin ones, and a gusset bag is suitable for thick ones.

When a person who purchases the packaging film A or the packaging bag B heats food or the like, he or she simply coats (wraps) only the food or a container such as a tray or stores it and installs it in a microwave oven. Well, the food inside can be heated while keeping an appropriate water content, which is extremely convenient for use.

As a method of use, it is easy to put food in the packaging bag B, squeeze the opening loosely, and bind the portion tightly with a clip such as clothespin. In this case, when the heating is rapid and the internal pressure for steam generated is high,
The pressure is released to the outside through a slight gap in the binding portion.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the embodiment of the present invention will be described with reference to FIGS. 1 to 3. A moisture-permeable cellophane paper 2 is applied to the coated surface of a polyolefin film 1 having one surface coated with Poval 3 and a large number of pores formed therein. A film A for packaging is formed by adhering with water (Fig. 1), and the heat-sealing agent 7 is applied to the entire periphery of the two surfaces of the moisture permeable cellophane paper of this film so that the two surfaces of the moisture permeable cellophane paper are on the inside. The film is folded in half and the one side edge is opened and the two side edges are welded to form a packaging bag B (FIG. 3).

Next, the tubular packaging bag shown in FIG. 4 will be described. A heat-sealing agent 7 is applied to the moisture permeable cellophane paper 2 on the two opposite side edges of the packaging film A, and the moisture permeable cellophane paper 2 is applied. The film is half-folded so that the surface is on the inside, and the heat seal agent 7 application portion is welded to obtain a tubular packaging bag B having openings on both sides in the longitudinal direction.

As another packaging bag B, the packaging film A and a laminate C in which a non-woven fabric 5 is laminated with an olefin film 6 are provided inside with the moisture permeable cellophane paper 2 side and the non-woven fabric 5 side. So that both sides are overlapped and one side edge is opened and the two side edges are welded to form a packaging bag B (FIG. 5, FIG.
6).

[0025]

Industrial Applicability According to the present invention, moisture-permeable cellophane paper or paper or rayon-based non-woven fabric is adhered with water on the surface of a plastic film, which is formed by coating poval on one surface and opening a large number of pores, to the poval-coated surface. Since the packaging film is formed into a tubular bag or a bag so that the moisture-permeable cellophane paper or paper or rayon-based non-woven fabric is the inner surface, the packaging film is used. Wet cellophane paper or paper or rayon-based non-woven fabric can be easily pasted with water to form a heat-resistant and tough film and bag, and when heating the food in a microwave oven or storing agricultural products, the food is packaged. It can be easily done by wrapping or covering with a film, or only by storing it in a packaging bag. Kill for, there is no compromising the food taste and appearance.

Further, since the film or packaging bag of the present invention is coated or stored in a container such as a tray storing food to be heated in a microwave oven, there is no possibility that moisture or the like may enter inside during transportation or storage thereof. In addition, since it is not necessary, and when it is used in a microwave oven, the water-containing food inside can be heated while keeping an appropriate amount of water, which is extremely convenient in use.

Furthermore, by applying a heat-sealing agent to the peripheral or side edges or partially of the surface of the moisture-permeable cellophane paper or the paper or rayon-based non-woven fabric of the packaging film, the welding becomes easy and reliable, and as a packaging bag. This contributes to improvement of stability, workability in manufacturing process, and efficiency. In addition, a resin-molded container, particularly a container molded of polypropylene-based, polyethylene-based, polyester-based, polystyrene-based, or polyvinyl chloride-based resin, which can be heat-sealed to the flange portion and used as a lid material, Become.

The nonwoven fabric surface of the laminate obtained by laminating an olefin film, a polyester film, and a nylon film on a nonwoven fabric and the moisture permeable cellophane paper of the packaging film, or the surface of the paper or rayon nonwoven fabric is a cylinder. Since it is formed into a bag shape or a bag shape to form a packaging bag, it has the same effect as described above and is an oily food (for example, tempura).
By adsorbing the oil content of (1) onto a non-woven fabric, it is possible to provide a product that is not sticky and does not impair the taste.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a packaging film of the present invention.

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

FIG. 3 is a partially cutaway plan view of the packaging bag of the present invention.

FIG. 4 is a partially cutaway plan view of a packaging bag according to another embodiment.

FIG. 5 is a partially cutaway plan view of a packaging bag according to another embodiment.

FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG.

[Explanation of symbols]

A: Packaging film, B: Packaging bag, C: Laminated body, 1: Plastic film, 2: Moisture-permeable cellophane paper, 3: Poval, 4: Pore, 5: Nonwoven fabric, 6: Olefin film, 7: Heat Sealing agent.

Claims (5)

[Claims] 1. A packaging film characterized in that a large number of pores are opened in a plastic film coated with Poval on one side, and moisture-permeable cellophane paper or paper or rayon-based non-woven fabric is stuck on the surface coated with Poval with water. . 2. A packaging film, wherein a heat-sealing agent is partially or peripherally applied to the surface of the moisture-permeable cellophane paper or the paper or rayon-based nonwoven fabric of the packaging film of claim 1. 3. A packaging bag formed by using the packaging film according to claim 1 in a tubular shape or a bag shape such that the surface of the moisture-permeable cellophane paper or paper or rayon-based nonwoven fabric is the inner surface. 4. A nonwoven fabric surface of a laminate obtained by laminating an olefinic film, a polyester film or a nylon film on a nonwoven fabric, and the moisture permeable cellophane paper of the packaging film or the surface of a paper or rayon nonwoven fabric as an inner surface. A packaging bag formed into a tubular shape or a bag shape. 5. A lid member for heat-sealing the film according to claim 1 or 2 in a resin-molded container.