JPH02282075A - Sealed container - Google Patents

Abstract

PURPOSE:To eliminate the loss of flavor, taste and water without imparing convenience and sealability by providing a container with a specific layer structure and a lid with a specific layer structure or layer-to-layer strength and forming a seal therebetween by a specific method. CONSTITUTION:A lid body 2 is formed of at least two layer laminated film, i.e., a heat sealable substrate 3 and an outer separating layer, and provided with a slit or hole in such manner that a partial opening part is formed upon separation of the outer separating layer 6 alone from the substrate 3. This lid is sealed to a container in a higher strength than the separating strength. This permits the outer separating layer 6 to be opened and, when the container is put in an electronic oven and as the food in the container is heated, the emission of vapor from the food is limited to only a part of the lid, thereby reducing the possibility of the flavor and taste being impaired.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a container consisting of a plastic cup body having a flange portion and a lid body, which has excellent sealing performance during storage and can be cooked in a microwave oven when eaten. It can be heated, prevents moisture and flavor from scattering, can be used in a microwave oven without losing the flavor of the food, and is easy to open and can be used for foods that bring out flavor, aroma, etc. through solid-liquid separation. This relates to heavily tampered containers.

[Conventional technology]

When storing fruits and vegetables for a long time, they are often stored in a liquid containing sugar or salt, sealed, and heat sterilized to prevent the contents from deteriorating.

However, in order to remove these foods from their containers, or
When eating it as is, it is necessary to remove the liquid for preservation.

Previously, after removing the lid, the container was tilted to drain the liquid, but with this method, the contents sometimes came out, or the liquid could not be removed completely, resulting in a loss of texture. there were.

In order to improve this problem, a method is used in which a part of the lid material is made of aluminum foil, etc., and a cut hole is made, and the liquid is removed by poking the hole with a fork, chopsticks, straw, etc.
247), but when the hole is made, it is unhygienic as there is a possibility that dirt from outside the lid may get inside, and a jig is used to make the hole, so if the hole is too large,
There were cases where fingers were injured by the jig.

In addition, in order to prevent this, a hole is made in the lid in advance and the hole is sealed with a tape-shaped sealing material, and the bagasse method is often used in the 1980-25390ETC, but the tape peels off during transportation. In addition, there was a drawback that adhesive remained in the peeling hole of the tape, spoiling the appearance after opening.

In addition, as a method to prevent these drawbacks,
63, U.S. Pat. No. 57-180678, JP-A No. 59-178
247, JP-A-61-287571, JP-A-62-19
3977, etc., the lid has a two-layer structure, and the outer peeling layer is peeled off and the inner sealing layer is provided with holes, making it easier and more hygienic to remove liquid than the above-mentioned products. Since the seal with the container body is completely sealed, it has the disadvantage that it cannot be opened easily.

In recent years, due to changes in lifestyles, the trend toward nuclear families, the increase in single-person families, and the development of convenience stores, microwave ovens have become rapidly popular, and as a result, the number of microwave foods heated and cooked in microwave ovens has also increased. ing.

However, most microwave food containers are of the type in which the lid of the sealed container is removed before being placed in the microwave.

In this type, the container lid is open in the microwave, and as the food is heated, the moisture, flavor, and aroma inside the food scatter, and the flavor of the food decreases considerably, and it becomes food just by heating it. In order to prevent this, there were cases where the lid was removed and then covered with an overcap (with a hole) to prevent scattering, but it was expensive to use as a container, and it could not be placed in the microwave. It has the disadvantage that it is not convenient because the overcap is placed on the front.

On the other hand, as a microwave-heated seal is attached to the lid of the container and heated, the seal layer rises, melting the lid at the sealed area, and causing the area to burst as the internal vapor pressure increases. This method was also developed, but since the lid part was melted, there was a risk that some of it would get into the food, making it unhygienic.

[Problem to be solved by the invention]

The present invention provides a container for foods that is stored in liquid and requires removal or separation of the liquid when edible, which has conventionally been difficult to provide both liquid separation properties and easy opening. As a result of various studies to create a hygienic container that does not impair product quality, convenience, or sealability, and eliminates the scattering of scent, flavor, moisture, etc. in a microwave oven, we decided on the layer structure of the container body, and the lid. We found that the problem could be solved by appropriately setting the layer structure of the body, the strength of the glabella, and the sealing method between the container body and the lid, etc. Based on this knowledge, we conducted various studies and completed the present invention. This is what led to this.

(Means for solving ilWI) The present invention is a laminated film of at least two layers, a base material having heat-sealability and an outer release layer, and when only the outer release layer is peeled off to the base material, partial This is a sealed container that can be sealed with a lid having a slit or a hole so as to form an opening with a seal strength stronger than the peel strength, and can be easily opened with the container body.

The lid material used in the present invention includes a heat-sealing base material such as PE, PP, εVA, etc., a thermoplastic resin sole film having heat-sealing properties, or PET;
It consists of a laminate film with a strength-retaining thermoplastic resin layer such as Ny, PP, EνOf (etc.), and these heat-sealable base materials have a layer that allows only liquid to be removed when the outer peeling layer is removed by ml. Or provide a slit line or hole that allows the vapor pressure of the contents to be reduced.

Mata the above heat sea/l/base material NiPET, My,
A thermoplastic resin film such as PVDCEVO) or PP is laminated as an outer release layer that provides physical properties such as protection, barrier properties, strength retention, etc. At this time, it is necessary to bond the outer peeling layer and the heat-sealable base material together with a lamination strength that is lower than the sealing strength between the container body and the lid.

There are two ways to accomplish this: one is to provide the lid heat-sealing layer with an easy-to-beer function, and the other is to provide the container body with easy-peel properties.

The former is a method that adjusts the sealing strength by blending a portion of the lid heat-sealing resin with a resin that inhibits the heat-sealing property.A typical method is to blend PP as the main heat-sealing layer with 20% PE as the heat-sealing layer. A method of adjusting the peel strength by blending ~50 parts is known, and this blending method can be selected as appropriate depending on the type and contents of the main container sealing layer.

For the latter, one method is to select the sealing strength by blending various resins, as is the case with the lid, and another method is to adjust the peel strength between the main body seal layer and the adjacent layer so that it is easy to peel, and to create a main body heat seal layer. There is a method of peeling off the layer and opening the package.

It is desirable to set the difference in peel strength and seal strength between the outer peel layer of the lid and the base material to 300 g/25 w or more.

For example, if the difference is less than 300g/25wn, when the outer peeling layer is peeled off, separation from the sealing surface between the container body and the lid will occur at the same time, resulting in slipping of the lid base material, which was the original purpose. 7), holes will no longer form.

[For production]

The operation will be explained below using figures.

FIG. 1 is a sectional view of the lid material of the present invention.

Figure 2 shows the lid material seen from the top.

Partial cuts 21 are made in the heat sealing base material 3 of the lid material.
This part is strongly bonded as shown in Figure 2, forming an elastic bond 24, and the other parts are weakly bonded with a weaker adhesive strength than the container body and lid. It consists of an adhesive part 23.

To open the package, first, as shown in FIG. 5, the outer peeling layer 6 is opened to separate the solid and liquid, and the package is placed in a microwave oven in this state. If solid-liquid separation is performed in this state, the liquid separation can be performed smoothly and the solid contents will not spill.

In other words, if the container contains mitsumame, etc. and is used as a container that is eaten after removing the liquid inside, the third
As shown in the figure, the outer peeling layer 6 is opened, the liquid in the container is drained from one to several holes as shown in Figure 4, and then the outer peeling layer 6 is opened.
As shown in the figure, the heat-sealed base material is easily opened.

Furthermore, if the food is placed in a microwave oven in this state, water vapor will begin to scatter as the food inside heats up, but the scattering will be limited to a portion of the lid, and the flavor and taste will not be impaired.

The lid is removed after the food is sufficiently heated or cooked.

Example I Using polypropylene with a total diameter of 800 μm, a container body having an inner diameter of 70 φ, a flange outer diameter of 82 φ, and a height of 30 M was obtained.

External surface as lid material! IJ delamination PET (25μ), 0lly (15μ)/easy peel layer (HDPE and PP
(mixed at a blend ratio of 40:60 to form a film)
The lamination strength of the strongly bonded part is 500g/
251 The lamination strength of the adhesive part is 300g/25-
I adjusted it so that

The container body and lid were heated at 180'C and the sealing pressure was 10k.
g/cd, 1.5 seconds, the contents were filled with mitsumame and heat-sealed.

The seal strength between the main body and the lid at this time is 1000 g/
It was 25cm wide.

On the other hand, for comparison, 0Ny (15μ) /pp (
When a similar heat sealing test was conducted using 60μ), it was found that the liquid and solid components of the mitsumame were smoothly separated in both the Example and Comparative Example, but according to the Comparative Example, the subsequent peeling of the container and lid was difficult. It was unsuccessful and the solid contents could not be separated.

Example 2 Total thickness of 800μ and sealing layer) IDPE and PP
Heat seal N5゜μ and polypropylene 730μ with a blend ratio of 30:70 were used as adhesive layer 2.
A container body having an inner diameter of 7θφ, a flange outer diameter of 82φ, and a height of 30μ was obtained using the coextruded sheet bonded with 0μ.

External release layer PET (25μ) is used as the lid material, and 0N is used as the base material for heat sealing so that it has a notch with a diameter of 5 mm.
y (15μ) / PP (60μ) was processed so that the strongly bonded part was 500g/25++m and the weakly bonded part had a laminate strength of 300g/25mm, and the same test as in Example 1 was conducted. First, liquid separation was smoother than before, and solid removal was also smoother afterwards.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the lid material of the present invention, Figure 2 is a top view of the lid material of the present invention, Figure 3 is a diagram of the outer peeling layer being opened, and Figure 4 is a diagram showing the state in which the liquid in the container is drained through the hole. FIG. 5 is a perspective view showing a state in which the heat seal base material is being discharged; and FIG. 5 is a sectional view showing a state in which the heat seal base material is unsealed.

Claims (1)

[Claims] (1) A laminated film consisting of at least two layers, a base material with heat-sealing properties and an outer release layer, and slits or holes are formed so that a partial opening occurs when only the outer release layer is peeled off from the base material. A sealed container which can seal a provided lid with a sealing strength stronger than the peel strength, and can easily open the container body and the lid.