JPH0443026A - Composite film - Google Patents

Abstract

PURPOSE:To manufacture fried food simply from a food blank without using frying oil by applying a fat and oil layer to one surface of a film with the layer of a conductive material or a magnetic material heat-generated by microwaves. CONSTITUTION:When food is covered with a composite film 1 and heated by microwaves in an electronic oven, covered food is heated directly by microwaves while the conductive material or magnetic material 2 of the heat-generating film 1 is heat-generated, and the oil temperature of a fat and oil layer 4 formed on the inner surface of the film 1 is increased suddenly. Accordingly, food is brought to the state in which it is cooked by oil from the whole surface, thus bringing the eating feeling of the outer surface of food to a crispy state.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a composite film for use in microwave cooking of foods, in which one side of the film has a conductive material or a magnetic material that generates heat by microwaves. To provide a fried-like food product which can be easily prepared from food materials and has an excellent texture due to the fried effect of the oil and fat layer applied to the food.

(Prior Art) When cooking food in a microwave oven (hereinafter referred to as microwave oven), it is known to incorporate a material that generates heat by microwaves into a food container as a method of browning the surface of the food. For example, there is Tokuko Sho 60-15548.

In addition, as a method for easily producing fried foods without using frying oil,
1, JP-A-2-16937, etc.

(Problems to be Solved by the Invention) The film containing a layer of conductive material disclosed in Japanese Patent Publication No. 60-15548 is effective for browning the surface of food products during microwave heating, but it does not produce a crispy texture similar to that of butter. It does not provide a pleasant texture.

In addition, in JP-A-1-29544, when heating in a microwave oven, the dielectric constant of water in the material is higher than that of oil on the surface of the material, and the core temperature increases compared to batter. Because the process is so fast, it is difficult to obtain a crispy texture. Furthermore, Japanese Patent Application Laid-Open No. 2003-20021-1 uses powdered oil with a high fat and oil content in the batter.
5831, Japanese Patent Application Publication No. 2003-11102 using a batter containing an emulsion layer
-16937 requires special processing and lacks the convenience of being able to easily produce fried foods from food materials at home.

An object of the present invention is to enable fried foods to be easily produced from food materials by microwave cooking without using frying oil.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the inventor of the present invention, as a result of intensive research, has provided an oil layer on one side of a film having a layer of a conductive material or a magnetic material that generates heat by microwaves. This led to the invention of a composite film. In other words, due to the lubrication effect of the oil layer applied to one side of the film that has a layer of conductive material or magnetic material that generates heat by microwaves,
This is a composite film that allows an excellent fried food with a crispy texture that is difficult to obtain by microwave heating to be easily obtained from raw food materials without using oil even in ordinary households.

In the present invention, the layer of electrically conductive material that generates heat by microwaves may be a conductive elemental metal having a thickness having an electrical resistivity of at least about 0.4 Ω/in 2 as disclosed in Japanese Patent Publication No. 60-15548. layer, specifically,
A vapor deposited layer of aluminum or the like can be used. The film having the conductive material layer is a film obtained by adhesively laminating the conductive material layer, a protective layer of a synthetic resin film such as polyester, and paper, ceramic sheet, glassine paper, etc. as a support.

Further, as the layer of magnetic material that generates heat by microwaves in the present invention, for example, a ferromagnetic metal as disclosed in US Pat. No. 2,830,162 can be used.

In the present invention, the oil and fat used for the oil layer formed on the negative side of the film having the conductive material or magnetic material layer (hereinafter referred to as heat-generating film) include vegetable oil, animal oil, solid fat, and semi-solid expanded fat. , liquid oil, or a mixture of two or more of these, and is not particularly limited.

The thickness of the oil layer used in the present invention is preferably 0°1 to 1
0 m, more preferably 0.1 to 1 m+++. If the thickness is smaller than O, lam, the oil and fat will not have a thickening effect. Moreover, if it is larger than 10 mm, the amount of fats and oils flowing out of the composite film during cooking will increase, which is not preferable because it will stain the inside of the microwave oven.

Next, a method for forming an oil layer in the composite film of the present invention will be described. Possible methods for forming the oil layer on the heat generating film include coating, spraying, etc., but are not particularly limited. In the case of coating, a thin film forming device such as a spreader for preparing a chromatographic plate for thin layer chromatography or a rotating drum is used to form an oil layer of a certain thickness on the exothermic film, and then the oil layer is removed by cooling. It should be stabilized. Similarly, in the case of spraying, an oil and fat layer is formed using an ordinary atomizer, and then cooled to obtain the desired composite film. However, in the case of solid fat, it may be applied or sprayed onto the film after being heated and melted.

Furthermore, the above-mentioned fats and oils can also be fixed to an immobilization base material and adhered to the film. Examples of the immobilization base material include porous starch (trade name "QS-IJ" manufactured by Asahi Kasei Corporation).

Note that when using the composite film, it is necessary to bring the oil layer into contact with the food, so the food is coated with the oil layer of the composite film as the inner surface.

(Effects of the Invention) The composite film of the present invention has the above-described structure, and when food is covered with this composite film and heated in a microwave oven, the covered food is heated directly by the microwave. At the same time, the conductive material or magnetic material of the heating film generates heat, and the temperature of the oil layer formed on the inner surface rapidly rises due to heat conduction. Therefore, the entire surface of the food is coated with oil, and the texture of the outer surface of the food can be made crispy. This effect cannot be obtained by using a conventional heat-generating film alone or by coating the surface of the frying material with an oil layer.

In other words, in the former case, the conductive material of the heating film generates heat due to microwave heating, and the inside heats the food using radiant heat, but since there is no oil or fat that acts as a heat medium other than the oil or fat derived from the material, the I can't get the texture of Cho-sama. In addition, in the latter case, the dielectric constant of water in the material is higher than that of oil on the surface of the material, so the internal temperature rises quickly and only the water in the ingredients scatters, resulting in a hard texture. be. On the other hand, because the temperature of the oil rises slowly, it is not possible to obtain the crispy texture of the oily surface.

(Examples) Examples and comparative examples of the present invention will be described below, but the present invention is not limited to these Examples.

Example 1 As shown in FIG. 1, a heating film for microwave oven 1 (product name: "MicroCrisp 0") consisting of a support (paper) 1, an aluminum vapor-deposited layer 2, and a protective layer (polyester) 3 was prepared.
: Ray Maldon Co., Ltd.) on the surface of the protective layer 3 using a spreader for thin layer chromatography to spread 0.5% of palm oil 4.
It was applied to a thickness of mo. This composite film was refrigerated (5°C
・30 minutes), and a composite film was prepared by preventing the oil from flowing.

30 g of raw potatoes were cut into 5-6 mm pieces, washed with water, drained, and covered with a 200 x 200 m composite film with an oil layer on the inner surface. Microwave this (600
W) and heated for 3.5 minutes.

Example 2 On the support (paper) surface of a heat-generating film for microwave oven (product name = "Microcrisp 0": Ray Maldon Co., Ltd.),
For paint spraying, palm oil was sprayed using a high-pressure sprayer, and the mixture was refrigerated to produce a composite film.

Two commercially available frozen shrimp tempura (heat-treated) were covered with a composite film of 200 x 200 m and placed in a microwave oven (6
00W) and heated for 2 minutes.

Comparative Example 1 30g of raw potatoes were cut into 5-6 pieces, washed with water, drained, and processed into food packaging roughpfilleum (product name:
“Saran Wrap 0”: Asahi Kasei Corporation) 20
Coated at 0x200m. Microwave this (600
W) and heated for 3.5 minutes.

Comparative Example 2 Cut 30 g of raw potatoes into 5-6 inch pieces, wash them with water, drain them, and make them into a heat-generating film for microwave ovens (product name:
"Microcrisp ■": Ray Maldon Co.) 200X
It was coated at 200 am and heated for 3.5 minutes in a microwave oven (600 W).

Comparative Example 3 30 g of raw potatoes were cut into 5 to 6 am pieces, washed with water, drained, and coated with 5 g of palm oil on the surface. This was covered with a 200x200an food packaging wrap film (trade name: "Saran Wrap O", manufactured by Asahi Kasei Industries, Ltd.), and heated for 3.5 minutes in an electronic L/7 oven (600W).

Comparative Example 4 30 g of raw potatoes were cut into 5-6 mm pieces, washed with water, drained, and coated with 5 g of palm oil on the surface. Heat-generating film for microwave oven (product name: "Microcrisp": Ray Maldon Co., Ltd.) 200X200f
Cover it with fiIi and put it in the microwave (600W) 3
．． Heated for 5 minutes.

Comparative Example 5 Two commercially available frozen shrimp tempura (heat-treated)
Wrap film for food packaging (product name: Saran Lamp [
200X200txn
and heated in the microwave (6oow) for 2 minutes.

Comparative Example 6 Two commercially available frozen [shrimp tempura (heat treated)]
It was covered with a heat-generating film for microwave oven (trade name: "Microcrisp [Phase]", Ray Maldon Co., Ltd.) 200 x 200 m, and heated in a microwave oven (600 W) for 2 minutes.

Table 1 shows the evaluation results after heating.

As can be seen from the results in Table 1, the fried foods obtained in the Examples had a good texture in both the contents and the surface (coating), whereas the foods obtained in the Comparative Examples had a good texture. Good texture could not be obtained.

In particular, in Comparative Example 4, even though palm oil was applied to the surface of the ingredients, there was no oil-frying effect because the heat-generating film and the oil were not in close contact with each other, so the temperature of the oil was difficult to rise.

In addition, in Comparative Examples 2, 4, and 6, which did not contain an oil layer and heated only with the heat-generating film, a part of the heat-generating film was scorched during microwave heating, making it dangerous to handle. there were.

3...Protective layer 4...Palm oil layer 5...Shredded raw potato (1 other person)

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the composite film of the present invention, FIG. 2 is a diagram showing a state in which the composite film is coated, and FIG. 3 is a perspective view in a cooking state.・Support ・Aluminum vapor deposited layer

Claims (1)

[Claims] A composite film made by applying an oil layer to one side of a film that has a layer of conductive or magnetic material that generates heat using microwaves.