JPH09199271A - Microwave oven heating sheet and packaged body using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microwave oven heating sheet by which heating at a higher temperature than that of a conventional heating sheet using a PET sheet is possible, and further a vessel can be formed of the sheet itself by using specified nylon as a base material sheet. SOLUTION: In a microwave oven heating sheet, a microwave oven heating layer 2 is provided on one side of a base material sheet 1 made of nylon produced by a polycondensation reaction of 1,4-diaminobutane and adipic acid (hereafter, called 4, 6 nylon). By stacking a sheet 3 made of paper or the 4, 6 nylon on an opposite side to the base material sheet 1 side of the microwave oven heating layer 2, the heating layer 2 can be protected and heating efficiency can be increased. For the microwave oven heating layer 2, any of an aluminum deposition layer, a mixture deposition layer of aluminum and aluminum oxide, or an ITO deposition layer is used. After containing food in a vessel whose inside is the base material sheet 1, the same is tightly sealed so as to form a microwave oven heating packaged body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating sheet for a microwave oven for cooking, which is used for imparting brown marks to food in a microwave oven, and a package using the heating sheet.

[0002]

2. Description of the Related Art A large number of heat-generating sheets used in microwave oven cooking have been proposed and some have been put into practical use. For example, a container using a heat-generating sheet in which a metal vapor deposition layer is provided on a heat-resistant plastic film (Japanese Patent Publication No. 60-15548).
In addition, there is a heat-generating sheet having a heat-generating layer made of a mixture of aluminum and aluminum oxide on a heat-resistant plastic film (see Japanese Patent Publication No. 4-68758), which has been put into practical use.

A biaxially oriented polyethylene terephthalate sheet (hereinafter referred to as a PET sheet) is generally used as the heat generating sheet in consideration of heat resistance and the like. This PET sheet has excellent vapor deposition suitability and the like, but when used as a microwave oven heat generation sheet, the limit is 230 ° C., and heating at a higher temperature than this is impossible. For this reason, the heating time must be shortened. For example, when a large-sized food is heated and cooked, the amount of heat is insufficient and sufficient heating cannot be performed. Moreover, since the PET sheet is not suitable for heat sealing, the heat generating sheet itself cannot be used as a container.

On the other hand, a polyimide sheet is a typical example of the heat-resistant sheet, but the polyimide sheet is expensive and difficult to use as a food sheet, and like the PET sheet, it is heat-sealed. I could not use it as a container as it was because it was not suitable.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a sheet that can generate heat in a microwave oven and can generate heat at a higher temperature than a heat generating sheet using a conventional PET sheet. The present invention aims to provide a sheet and a package using the heat generating sheet.

[0006]

The present invention is characterized in that a microwave heating layer is provided on one side of a base sheet made of nylon produced by a polycondensation reaction of 1,4 diaminobutane and adipic acid. It is a microwave heating sheet. A second invention is an electronic device in which a sheet made of paper or a sheet made of nylon produced by a polycondensation reaction of 1,4 diaminobutane and adipic acid is laminated on the opposite side of the substrate sheet of the microwave oven heating layer of the heating sheet. It is a microwave heating sheet.

A third aspect of the present invention is the heat generating sheet described above,
The microwave heating layer has a light transmittance of 500% at 500 nm.
It is the microwave heating sheet described above. A fourth invention is a microwave heating sheet in which the microwave heating layer is any of an aluminum vapor deposition layer, a mixed vapor deposition layer of aluminum and aluminum oxide, or an ITO vapor deposition layer. A fifth aspect of the invention is a microwave oven heat-generating sheet using a non-stretched nylon sheet produced by a polycondensation reaction of 1,4 diaminobutane and adipic acid as a base sheet. A sixth aspect of the present invention is a microwave heating package in which the base sheet surface of the heat-generating sheet described above is placed inside, and after the food is stored, the periphery is sealed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, one side of a base sheet 1 made of nylon (hereinafter, referred to as 4,6 nylon) produced by a polycondensation reaction of 1,4 diaminobutane and adipic acid, It is a microwave heating sheet provided with a microwave heating layer 2. Further, as shown in FIG. 2, it is a microwave heating sheet in which a sheet 3 made of either paper or 4,6 nylon is laminated on the side of the microwave heating layer 2 opposite to the base sheet 1.

The thickness of the substrate sheet 1 is not particularly limited, but is 15 to 50 μm, preferably 20 to 30 μm.
m is preferred. Further, either unstretched or stretched state may be used, but when used as a container as it is,
The unstretched one is used. Next, the microwave heating layer 2 is made of any one of an aluminum vapor deposition layer of 50 to 150 Å, a mixed vapor deposition layer of aluminum and aluminum oxide, and an ITO vapor deposition layer. In order to keep the contents visible,
A material having a transparency of 30% or more in terms of light transmittance is used.

The sheet 3 protects the heat generating layer 2 and
It is provided to increase the heat generation efficiency. In the case of 4,6 nylon, the same specifications as described above may be used, and in the case of paper, the range of ^{20 to} 500 g / m ² may be used according to the purpose. Can be used.

As shown in FIG. 2, the means for forming a laminated state is not particularly limited, but it is preferable to use a curable urethane adhesive having heat resistance.

When the heat generating sheet shown in FIG. 1 or FIG. 2 is used, it may be used as it is, but in the case of a content which needs to remove steam during heating, it is used as a structure having a part of a hole.

[0013]

【Example】

[Test Example 1] A curable urethane-based adhesive was applied to the heat-generating layer 2 surface of a sheet having a heat-generating layer 2 made of a 100 liter aluminum vapor-deposited layer on one surface of a base material sheet 1 made of 4,6 nylon (20 μm). A heat generating sheet was obtained by laminating the sheet 3 made of 400 g / m ² of paper. This heat-generating sheet was made into a circular shape, and a 10-inch pizza was placed on it. When it was cooked in a microwave oven of 500 W for 180 seconds, there was a crispy feeling to the center of the pizza, and the base sheet was
No phenomenon of cracking or melting was observed.

Test Example 2 A heat generating sheet having the same structure as in Test Example 1 was used, except that the substrate sheet 1 was replaced with 4,6 nylon and a PET having a thickness of 12 μm was used. The pizza was cooked in the same manner as in Test Example 1 for 2 seconds. As a result, a crispy feeling was obtained in the peripheral portion of the pizza, but no crispy feeling was obtained in the center.

[Test Example 3] A pizza was cooked under the same conditions as in Test Example 1 using the same heat generating sheet as in Test Example 2 above. Part melted.

[Test Example 4] The thickness of the vapor-deposited aluminum layer of the heating layer 2 of Test Example 1 was 70Å, and the thickness of the paper of the sheet 3 was 3
A bag-shaped container having the base sheet 1 as an inner surface was prepared by using a heat-generating sheet having a hole of 1.0 mm diameter at a rate of 0 g / m ² and 10 pieces per 1 cm ² . next,
Put a hot dog in this container, seal the opening and
It was cooked for 150 seconds in a 0 W microwave oven. As a result, a hot dog with a crisp texture was obtained.

[Test Example 5] The thickness of the aluminum vapor deposition layer of the heat generating layer 2 of Test Example 4 was 60Å, and the sheet 3 was the base sheet 1.
A bag-shaped container having the base sheet 1 as an inner surface was prepared by using the same sheet as in Example 1 and a heat-generating sheet having the same holes as in Test Example 4. When the hot dog was put in this container, the contents could be confirmed. 500 in this container
The light transmittance in nm was 50%. Next, after sealing the opening, it was heated and cooked in a microwave oven of 500 W for 150 seconds. As a result, a hot dog with a crisp texture was obtained.

[0018]

As described above, by using 4,6 nylon as the base material sheet, it is possible to heat at a higher temperature than the conventional microwave oven heat generation sheet, and to cook large contents and for a long time. Cooking is now possible. Further, since the heat generating sheet itself is heat-sealable, it can be used as a container such as a bag as it is, and there is no limitation to use the heat generating sheet integrally with another base material as in the conventional case. Expanded application development. Further, by using 4,6 nylon for the sheet as well, the transmittance of visible light can be set to 30% or more, and the food can be cooked while checking the contents.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a heat generating sheet of the present invention.

FIG. 2 is a sectional view showing another embodiment of the heat generating sheet of the present invention.

[Explanation of symbols]

 1 ... Base material sheet 2 ... Heating layer 3 ... Sheet

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B32B 27/34 B32B 27/34 B65D 81/34 B65D 81/34 W

Claims (6)

[Claims] 1. A microwave heating sheet comprising a substrate sheet made of nylon produced by a polycondensation reaction of 1,4 diaminobutane and adipic acid, and a microwave heating layer provided on one surface of the substrate sheet. 2. The electron according to claim 1, wherein a sheet made of paper or nylon made by polycondensation reaction of 1,4 diaminobutane and adipic acid is laminated on the opposite side of the base sheet of the microwave heating layer. Range heating sheet. 3. The microwave heating sheet according to claim 1 or 2, wherein the microwave heating layer has a light transmittance at 500 nm of 30% or more. 4. The microwave heating layer is an aluminum vapor deposition layer, a mixed vapor deposition layer of aluminum and aluminum oxide,
Alternatively, the microwave heating sheet according to any one of claims 1 to 3, which is formed of an ITO vapor deposition layer. 5. The base sheet is an unstretched sheet.
A microwave oven heat-generating sheet according to claim 4. 6. The microwave oven heating package according to claim 5, wherein food is stored in a container having a base material sheet inside and then hermetically sealed.