JPS6228347A - Packaging bag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a packaging bag that can store foods and the like and cook them in a gas oven, an electric oven, or the like.

[Conventional technology and its problems]

In recent years, there has been an increase in the number of cooked or semi-cooked foods that can be served to the table simply by reheating them in gas ovens, etc. In order to prevent the taste and quality of such foods from deteriorating, it is necessary to protect them from light, air, and moisture. It is common to use packaging materials that use metal foil such as aluminum foil, which has excellent barrier properties, to package the product in a hermetically sealed manner.

However, aluminum foil and the like break easily and are not suitable for packaging when used as is, so a laminate with a synthetic resin film or the like is used. If a product packaged with such a laminate is heated as is in an oven, the other layers other than the aluminum foil will deteriorate due to the heat and generate toxic gas, which may have a negative effect on the food itself. There is.

It is an object of the present invention to solve the above-mentioned problems and to provide a packaging bag that can be cooked in an oven by allowing the synthetic resin film, etc. which deteriorates when heated, to be removed before cooking.

[Means of problem solving]

In order to achieve the above object, the present invention provides a heat sealing layer on the inner surface of aluminum foil and a surface protection film layer on the outer surface with an adhesive layer interposed therebetween, and heat seals the heat sealing layers on the inner surface with each other for sealing. In the packaging bag, the adhesive layer is provided intermittently or the adhesive strength is weakened, so that the surface protection film layer can be peeled off by hand.

[Effect]

In this way, when the surface protection film layer is peeled off and removed, the aluminum foil is exposed and is directly heated, so there is no risk of deterioration, and if necessary, the heat sealing layer can be applied only to the heat sealed area. If provided, everything except the aluminum foil can be removed by cutting off this heat-sealed portion.

〔Example〕

FIG. 1 shows a packaging material 1 used for a packaging bag. As shown in the figure, a heat-sealing layer 3 made of thermoplastic synthetic resin is provided on the inner surface of the aluminum foil 2 at a location corresponding to the heat-sealing portion when forming the bag, and the outer surface of the foil 2 is provided with a heat-sealing layer 3 made of thermoplastic synthetic resin. A surface protection film layer 6 is provided via the adhesive layer 4.

This film layer 6 is made of polyester, nylon (trade name), polypropylene, etc., and may be either a single layer or a laminate.

The intermittent adhesive layer 4 is formed by a so-called part coat of adhesive, and the pattern is similar to that of the second layer.
As shown in figures (a), (b), and (c), dotted, linear,
Any form, such as a grid pattern, may be used. In addition, for the purpose described below,
It is preferable to provide a band-shaped portion where no adhesive is applied, that is, an adhesive-deficient portion 5 along the unsealing portion.

The packaging material 1 may be provided with a tab 7 that projects from the outer periphery of the bag when it is formed into a packaging bag. This function will also be described later. Note that in this case, the above-mentioned adhesive missing portion can be omitted.

If the adhesive strength of the adhesive layer 4 is so weak that the film layer 6 can be peeled off by hand, the layer 4 may be formed by coating the entire surface of the adhesive, as shown in FIG. 3. However, the adhesive missing portion 5 is not coated.

When peeling off the film layer 6, such an adhesive layer 4
It is preferable to select a material that causes interfacial peeling from the aluminum foil 2 and mostly adheres to the film layer 6.

Further, the heat sealing layer 3 may be formed by coating the entire surface as shown in FIG. 3, depending on the type of contents to be packaged, the heating temperature, the type of synthetic resin, etc.

FIG. 4 shows a packaging bag 10 formed using the packaging material 1 as described above. As shown in the figure, the packaging material 1 is wrapped in a heat sealing layer 3.
The inner surface is folded in half, stacked one on top of the other, and heat-sealed on three sides except for the crease 11 at the periphery to form a heat-sealed part 12 as shown by the chain line. This heat sealing portion 12 corresponds to the heat sealing layer 3 in FIG. Alternatively, the bag 10 may be formed by stacking two different packaging materials 1 on top of each other and heat sealing the entire periphery thereof. Of course, the contents are enclosed within 1° of the bag.

When using this packaging bag 10, first cut the bag along the adhesive cutout portion 5 shown by the dotted line in FIG. 4 to form an opening. At the end of this opening, since there is no adhesive layer 4, the film layer 6 and the aluminum foil 2 are not bonded to each other, and the film layer 6 is lifted from the aluminum foil 2. When the film layer 6 is held and pulled, it separates from the aluminum foil 2. When the film layer 6 is similarly peeled off from the back side of the bag 1o, the aluminum foil 2 is exposed on the front side of the bag 10. Therefore, if the heat sealing parts 12 remaining on both side edges of the bag 10 are removed as necessary, only the aluminum foil 2 remains in the bag 10 as a whole. In this state, you can cook it by putting it in a gas oven or the like.

In addition, if the tab 7 is provided, the film layer 6 and the aluminum foil 2 are separated at the tip of the tab 7 (especially if it is an intermittent adhesive layer 4 as shown in FIG. ), the film layer 6 may be pulled and peeled off.

In the heat-sealing section 12 of the bag 10, the aluminum foils 2 are bonded to each other via the heat-sealing layer 3 on the inner surface of the bag 1°. Therefore, when the film layer 6 is to be peeled off as described above, a peeling force is also applied to the aluminum foil 2 at the same time. Therefore, in order to prevent the aluminum foils 2 from peeling off from each other, it is preferable that the peel strength is greater than that of the film layer 6.

〔effect〕

As described above, since the packaging bag of the present invention is made of a laminate of aluminum foil and a surface protection film layer, it is strong and has excellent barrier properties, can withstand handling such as transportation and storage, and can hold the contents. It can prevent the high value of the film and also makes the surface protection film layer removable.
N can also be used as is for heating in gas ovens and the like by simply removing the film layer.

That is, since the packaging bag of the present invention can be used consistently from transportation to storage to cooking, it can save time and effort, and at the same time has the effect of helping to save resources.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the packaging material used in the packaging bag of the present invention, Fig. 2 is a plan view showing the pattern of the adhesive layer of the same packaging material, and Fig. 3 is a cross-sectional view showing another example of the packaging material. FIG. 4 is a plan view showing an example of a packaging bag. DESCRIPTION OF SYMBOLS 1... Package, 2... Aluminum foil, 3... Heat sealing layer, 4... Adhesive layer, 5... Adhesive missing number, 6
...Surface protection film layer, 7...Tab, 1o...
packaging bag.ゐV Figure 3

Claims (1)

[Claims] A packaging bag in which a heat sealing layer is provided on the inner surface of the aluminum foil and a surface protection film layer is provided on the outer surface via an adhesive layer, and the inner heat sealing layers are heat sealed to each other to seal the contents. A packaging bag characterized in that the surface protection film layer can be peeled off by hand by providing layers intermittently or by weakening the adhesive strength.