JPH0796981A - Packing bag for microwaveoven with built-in cutter - Google Patents

Abstract

PURPOSE:To provide a packing bag which is automatically opened to cook the contents only by putting it in a microwave oven when putting a cooking food therein without opening the bag, in the food industry. CONSTITUTION:A cutter 2 made of hard plastic or metal or a thread is contained together with the contents 1 in a bag 3 made of a thermocontracting film having a large dielectric loss and processed to be heated by microwaves. When the bag is put in an microwave oven, the film as a container is heated and broken by the edge of cutter or the thread. Accordingly, the bag may be placed in a microwave oven without taking out the contents and hence, it is laborsaving and hygienic.

Description

Detailed Description of the Invention

[001]

[Industrial application] In the food industry, simpler handling is required, and the present invention relates to packaging of frozen foods for the convenience of consumers by simplifying the handling when cooking. Apparatus and method.

[002]

2. Description of the Related Art Conventionally, frozen foods or instant foods are used by heating them in hot water, an microwave oven or a microwave oven. When they are heated in a microwave oven, they are taken out of a bag and placed on a plate or the like. It is put on, wrapped in polyethylene wrap and then put in a microwave oven, or a hole is made in the bag to allow water vapor to escape, and then thawed and heated before use. Therefore, for example, a mixture of various kinds of food such as bento is unlikely to be frozen food, and it is the fact that only relatively simple food such as pilaf and dumplings is sold as frozen food. If the effort of wrapping is used, the ease of cooking frozen foods will be lost.

[003]

In order to take full advantage of the fact that frozen foods are easily cooked, if the contents are put into the microwave oven and heated without removing the contents from the container, the container will automatically It is intended to provide a container that can be opened and opened for heating and thawing. In this case, for example, even a food product such as a boxed lunch made of various food products can be easily provided as a frozen food product.

[004]

A heat-shrinkable film is widely used for packaging, labels and the like due to its property of shrinking when heated. In the case of food,
Air blocking performance is also important as an important function, and various plastic films are used. In the present invention, the property that the heat-shrinkable film shrinks when heated is used to automatically open the container and bag when heated. Place the contents (1) inside the heat-shrinkable bag (3) with a rigid frame (2) and use a sharp cutter at its end or attach the cutter, or put a sturdy thread inside the bag. It can be opened automatically by installing it and fixing it to the outer frame (4) provided outside the bag to make a cutter, and contracting when the bag is heated to open the bag with the cutter. You can make a container that can. When the microwave oven irradiates with microwaves, heat is generated due to dielectric loss of the object to be irradiated. However, the heat-shrinkable film has a small dielectric loss and cannot sufficiently raise the temperature in a short time. The aim is to overcome this drawback and to make a container that can raise the temperature sufficiently to open the bag even in the microwave oven. For that purpose, the dielectric loss of the heat-shrinkable film is raised, or a material having a large dielectric loss is adhered to raise the temperature of the substance to indirectly raise the temperature of the heat-shrinkable film.

[0095]

[Function] The simplest way to increase the dielectric loss is to add water, and if the heat-shrinkable film is wet,
The water is heated by microwaves and is heated in a short time to a temperature sufficient to shrink the film. A rough film surface can hold more water.
Similarly, if a material that absorbs water, such as paper or a thin film of water-retaining polymer, and a heat-shrinkable film are put together and frozen in a state of containing water, there is no need to soak them in water before cooking. . Similarly, if a substance having a large dielectric loss is contained in the heat-shrinkable film, the same effect can be obtained. Even if the bag containing the food is not necessarily entirely made of a heat-shrinkable film, the same effect can be obtained by sticking it to a bag made of another material. There is no problem even if the heat-shrinkable film is stuck to a film which does not allow air to easily pass therethrough, and it may be stuck to another film having a large dielectric loss. When a bag having these structures is put in a microwave oven, a substance having a high dielectric loss is heated by microwaves, and the heat-shrinkable film is shrunk and cut by a built-in cutter or thread to open the bag. Put the food in a container such as a plate, wrap it in advance, and then
By packaging the heat-shrinkable film so that it can be automatically opened by the shrinking action of the heat-shrinkable film, the trouble of opening the bag or transferring it to a container such as a plate and then wrapping it can be omitted.

[0096]

Example: A heat-shrinkable film is made into a bag, and a box-shaped frame is made of a rigid synthetic resin square rod that does not shrink by heat. A frozen food placed on a plastic plate is placed inside the frame. A frame with three sharp edges was placed in a bag and sealed. When the bag was soaked in water and wet, put in a microwave oven and heated, the bag contracted and was cut open at the edge, and the purpose was sufficiently achieved.

[Brief description of drawings]

FIG. 1 is a plan view of an example in which a cutter is provided inside.

FIG. 2 is a sectional view of an example in which a cutter is provided inside.

FIG. 3 is a plan view of an example in which a thread is provided as a cutter on an outer frame.

FIG. 4 is a cross-sectional view of an example in which a thread is provided as a cutter on an outer frame.

[Explanation of symbols]

1 is contents, 2 is a cutter, 3 is a heat-shrinkable bag, 4 is an outer frame, and 5 is a thread as a cutter

Claims (4)

[Claims] 1. A packaging container, which is made of a heat-shrinkable plastic film and has a structure in which a packaging film that shrinks when heated is provided with a cutter or a thread provided inside the bag, is heated by using a microwave of a microwave oven. For the purpose of heat shrinking the shrinkable film. When a heat-shrinkable film is pasted with a material that easily contains water, such as paper or a water-absorbent resin, and when it is heated in a microwave oven by absorbing water
A packaging bag that cuts open the bag by converting the microwave into heat to shrink the film. 2. To achieve the object described in "Claim 1". A packaging bag using a heat-shrinkable film containing a substance having a high dielectric loss, such as a water-absorbent polymer containing carbon or water. 3. To achieve the object described in "Claim 1". A packaging bag that uses a heat-shrinkable film with a roughened surface in order to retain more water when the surface of the heat-shrinkable film is wet. 4. To achieve the object described in "Claim 1". A method of wetting a container using a heat-shrinkable film with water before putting it in a microwave oven, and a method of displaying that the container is wet with water.