JPH063868U - Heat seal container - Google Patents

Abstract

(57) [Summary] [Structure] A container body having a flange portion on the outer periphery of the opening, at least the surface of the flange portion being formed of a heat-sealing resin, and a lid body having at least an inner surface formed of the heat-sealing resin. In the container that is heat-sealed with the flange portion, at least the flange surface is formed with a heat-sealing portion that goes around the outer circumference of the container in a plurality of annular lines, and the annular lines are a plurality of parts. A heat-sealed container characterized by being connected by a weir. [Effect] By adopting the annular line heat-sealing structure having the plurality of weirs, even if a part of the annular line is defectively trapped in the steam generated by the cooked food,
The heat-sealing container for the retort food is provided, which maintains the hermeticity as a whole container.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a container, which comprises a heat-sealable container body having a flange portion and a heat-sealable lid, and is heat-sealed at the flange portion. More specifically, the present invention relates to the flange portion. However, it is heat-sealed in the shape of an annular wire with multiple weirs, and even if a part of the annular wire fails to be caught in the steam generated by the cooked food, the entire container maintains its hermeticity. Moreover, even if the inside air expands due to heating, there is no risk of the container body and lid separating from each other at the heat-sealing section, and if necessary, the lid can be easily removed from the container body by human power. The present invention relates to a heat-sealed container that can be used.

[0002]

[Prior art and its problems]

 BACKGROUND ART Food packaging containers made of heat-sealable resin have been widely known. In particular, it can be obtained by stacking a container body made of a thermoplastic resin and a thermoplastic resin lid, uniting the container body and the lid, and heat-sealing the contact parts of both. Food packaging containers are widely known. Among the food packaging containers, in particular, there is a food packaging container in which cooked food is sealed as it is, heated to heat the food inside, and then opened to remove the food inside. In addition, the ease of management / preservability and the ease of handling during use have been increasing rapidly in recent years.

By the way, when such a food packaging container is filled with freshly cooked food and heat-sealed with a film or the like to be hermetically sealed, water vapor generated from the cooked food adheres to the flange portion of the container body. However, during the heat-sealing operation, water vapor is caught in the heat-sealing part, often resulting in poor sealing, and countermeasures are being awaited.

Further, when a container in which food is packaged is heated with a microwave oven or hot water, the air existing inside expands to inflate the container, and when further heated, heat seal between the container body and the lid. It has been pointed out that the parts tend to be peeled off. Once the heat-sealed part of the container is peeled off, the water content of the container may be reduced, the quality of the food may be easily changed due to the oxidation, and the inside of the heating device may be contaminated. Also, when a heat-sealed container containing food is heated with hot water, if the lid is peeled off from the container due to the expansion pressure of the internal air, the hot water will enter the food inside and the shape of the food will collapse. There is a risk of inconvenience leading to the condition that food products must be discarded.

On the other hand, if the container body and the lid are strongly heat-sealed so that the container body and the lid are not peeled off even if the air in the packaging container expands, the peeling of the container at the time of heating can be surely prevented, but this time, the container is removed after cooking. Even if you try to open it, it will be difficult for you to open it, and the inconvenience of using scissors and knives will occur. Therefore, it is heat-sealed so that it is not peeled off by the air pressure expanded by the heating inside the container, and it can be easily opened by the force of human hands when opening after cooking. It is the current situation that the appearance of is waiting.

[0006]

[The purpose of the device]

 Therefore, the purpose of the present invention is to prevent the inclusion of water vapor in the heat-sealing portion during heat-sealing, even if water vapor generated from cooked food adheres to the flange portion of the container immediately before filling the container body and lid. Is reliably heat-sealed and the hermeticity is also maintained, no peeling is observed from the container due to expanded air pressure during heating, and moreover, when opening after cooking, a heat-sealed container that can be easily opened by human power. To provide.

[0007]

[Means for solving problems]

 The present invention has been proposed in order to achieve the above-mentioned object, and is characterized in that the heat-sealing shapes of the container body and the lid are made specific. That is, according to the present invention, a container body having a flange portion on the outer periphery of the opening, at least the surface of the flange portion of which is made of heat-sealable resin, and a lid of which at least the inner surface is made of heat-sealable resin are used. In a container in which the body is heat-sealed at the flange portion, at least the flange surface is provided with a heat-sealing portion that makes a plurality of circular linear lines around the outer circumference of the container, and the circular lines are There is provided a heat-sealed container characterized by being connected at a plurality of parts.

[0008]

[Specific configuration of device]

 The present invention will be described in more detail with reference to the drawings. In FIG. 1 showing a sectional view of an example of the container of the present invention and FIG. 2 showing a top view of the container of the present invention, the heat seal container of the present invention is a container. It is composed of a body (10) and a lid (20). The flange portion (11) of the container body and the inner surface of the lid are superposed and heat-sealed. The flange portion has a ring-shaped heat-sealing portion (1 and 2) and a line heat-sealing portion (3) that connects the annular wires to each other at a plurality of portions (hereinafter, referred to as "weir" in the present specification). Sometimes it is heat-sealed. That is, after the food (12) and, if necessary, the preservative (13) are stored in the container body, the flange portion of the container body and the lid body whose inner surface is molded with heat-sealable resin are It is heat-sealed into at least two annular wires connected by a plurality of parts, and the annular wires are connected by a weir at a plurality of parts. The preservative (13) is preferably formed, for example, in a pocket-shaped storage section on the inner surface of the lid and stored in the storage section, and a ventilation hole may be provided in the surface section of the pocket.

The weir, which is formed by connecting the annular wires to each other while being heat-sealed at the same time as the annular wire, squeezes water vapor into both of the two annular wires at the time of heat sealing. As long as the entrapment does not exist in the same weir, the weir is formed in the middle of the weir, so that the flow of air inside and outside the container is completely prevented. The shape of the annular wire may be any shape as long as it is an annular shape. However, the shape of the annular wire at the opening of the container body and the lid is slightly protruded. However, it is advantageous in terms of operability in opening. The line width of the annular line depends on the size of the container body and is not particularly limited, but it is usually preferably formed to be 1 mm to 5 mm. If the line width is too narrow, the heat seal strength will be weak and the sealing performance will be poor, and if it is too thick, the heat seal strength will be unnecessarily strong, which is not preferable.

The width of the weir connecting the annular lines is not particularly limited, but it is usually 1 mm or 3 mm in many cases. Further, the number of weirs that connect the circular wires also depends on the size of the container body and is not particularly limited, but it is preferable that the weirs are usually formed with an interval of about 20 mm to 50 mm. . The interval between the annular wires is also appropriately determined according to the size of the container and the size of the flange portion, but it is preferable to provide an interval approximately the same as the width of the annular wires to be heat-sealed.

In the present invention, since the container body and the lid are heat-sealed in such a heat-sealed state, it is possible to completely prevent the flow of air inside and outside the container, and moreover, the container body and the lid. When peeling the and, it is possible to easily peel by simply applying a slight force to the opened portion. The heat-sealing portion has such a sealing strength that it will not be easily peeled off even if the heated and expanded air in the container pushes up the container body or the lid.

That is, since the annular wire (1) and the annular wire (2) are connected to the weir (3) at a plurality of portions, the heat seal strength is sufficient, and they are not easily peeled off. . Even if the container body and the lid are peeled off at the portion of the ring line (1), the ring line (2) is not peeled off and the sheet is still peeled. The food inside is protected because it is packaged.

The container body is preferably a thermoplastic resin alone or a laminate having a surface made of a thermoplastic resin and having a reinforcing layer and a gas barrier layer as an intermediate layer, but is not limited thereto. It goes without saying that it is not a thing. Examples of the thermoplastic resin include one or more kinds of polyolefins such as polyethylene, polypropylene and ethylene-propylene copolymer, and thermoplastic polyesters such as polyethylene-terephthalate and polybutylene-terephthalate. Further, as the resin constituting the intermediate layer, ethylene-vinyl alcohol copolymer, vinylidene chloride resin, nylon, homopolymer of vinyl chloride, vinyl chloride as a main component, copolymer with other monomers, etc. 1 type or 2 types or more can be illustrated.

This container main body is formed from the thermoplastic resin or the film or sheet of the laminate by using a forming method known from before the present application such as vacuum forming, pressure forming, press forming, etc. , And the flange portion are integrally formed. The film or sheet may be manufactured by a method such as an extrusion method or an inflation method. It is also possible to employ a method in which a resin-only film or sheet is manufactured in advance and bonded with an adhesive.

It is preferable that the lid body also uses the same resin as that used in the container body and is manufactured from these resins. It is particularly advantageous in terms of heat sealability and hermeticity to use the same or similar resin as that used for the container body on the surface of the lid.

The lid body is formed by cutting the film or sheet of the thermoplastic resin or the laminate as it is according to the shape of the flange portion of the container, or by a molding method such as vacuum forming, pressure forming, press forming or the like. Can be used to produce an appropriate shape. At least a part of the lid body is made of a transparent film so that the contents stored in the package can be seen.

At least a part of the flange portion other than the openings other than the plurality of annular linear heat seal portions connected by a plurality of lines is heat-sealed in, for example, a dot shape or a lattice shape, It is preferable to form the weak heat seal portion rather than the annular linear heat seal.

In the heat-sealing method of the container body and the lid, first, as a first step, at least a part except the opening is heat-sealed in a dot or grid pattern, and then as a second step. It is preferable to perform heat sealing in an annular line shape having the plurality of weirs. By adopting such a heat-sealing process, the sealing between the container body and the lid becomes more reliable, the hermeticity is improved, and the workability is also improved. For heat sealing, it is preferable to employ a method in which the first step is performed with a knurled seal bar and the second step is performed with a heat sealer in the shape of a plurality of annular wires with weirs.

[0019]

[Effect of device]

 According to the present invention, since the flange portion of the container body and the lid are heat-sealed in an annular line shape that is connected by a plurality of lines, the heat-sealing strength is excellent, the sealing performance is good, and human power is required. It is possible to provide a heat-sealed container having a characteristic that it can be easily opened. In particular, it is useful as a food packaging container that is used after being heated in boiling water, a microwave oven, or the like. Further, in the heat seal portion, the heat seal step is performed in two steps, so that the seal becomes more reliable and the hermeticity is improved.

[0020]

【Example】

 The present invention will be described below with reference to examples. <Example 1> The inner and outer layers were made of polypropylene, the middle layer was made of ethylene-vinyl alcohol, and each layer was vacuum-molded with a modified polypropylene resin adhesive to integrally form the flange, side parts and bottom part. A container body having an outer diameter of the flange of 15 cm × 12 cm, an opening of 13.5 cm × 10.5 cm, and a width of the flange of 10 mm was obtained. On the other hand, a biaxially stretched ethylene-vinyl alcohol copolymer film having an ethylene content of 30 mol% and a polyvinyl chloride (PVC) sheet were laminated with a urethane adhesive to obtain a laminate.

A sealant layer made of a mixture of an ethylene-propylene copolymer, an ethylene-vinyl acetate copolymer, and a linear low-density polyethylene was formed on the PVC side of this laminate, and was rounded to 15 cm × 12 cm. I got a lid. After filling the container main body with retort food and storing the preservative in a storage pocket formed on the inner surface of the lid material, the lid bodies were overlapped and heat-sealed with a heat sealer. The heat-sealing part was heat-sealed into two annular wires connected by eight weirs.

In this heat-sealed container, a heat-sealing failure occurred due to water vapor being caught in the outer annular wire on the right side of the container opening face flange and the inner annular wire on the left side, but as a whole heat-sealed container However, the sealing property was maintained. Further, even if this food packaging container was heated with hot water or a microwave oven, peeling of the heat-sealed portion was not observed at all due to expansion of air inside. Also, after cooking with heat, it was possible to open the bag relatively easily by human power.

Comparative Example 1 The same container body and lid as in Example 1 were prepared, and both were heat-sealed. The heat seal part was formed by the same two annular wires as in Example 1 except that the weir was not formed. When this container was heat-sealed under the same conditions as in Example 1, slight steam entrapment portions were seen on the opposite sides of the inner and outer parts of the annular wire under heat sealing, and from the steam entrapment portions inside and outside this annular wire, Air circulated through the groove in the middle of the loop line, and as a result, the hermeticity of the entire heat-sealed container was not maintained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a heat-sealed container of the present invention.

FIG. 2 is a top view of the heat seal container of the present invention.

[Explanation of symbols]

 1, 2 Annular wire of heat seal part Heat seal 3 Weir connecting annular wires 10 Container body 11 Flange part of container body 12 Food filled in container 13 Preservative 20 Lid

Claims (4)

[Scope of utility model registration request] 1. A container body having a flange portion on the outer periphery of an opening, at least the surface of the flange portion being formed of a heat-sealable resin, and a lid body having at least an inner surface formed of a heat-sealable resin, In the container that is heat-sealed with the flange portion, at least the flange surface is formed with a heat-sealing portion that goes around the outer circumference of the container in a plurality of annular linear shapes,
A heat-sealed container, wherein the annular wires are connected by a weir at a plurality of portions. 2. The heat-sealed container according to claim 1, wherein at least a part of the flange portion other than the annular-shaped heat-sealed portion is heat-sealed in a dot shape or a lattice shape. 3. The heat-sealed container according to claim 1, wherein at least a part of the lid is formed of a transparent resin film. 4. The heat seal according to claim 1, wherein a dot-shaped or lattice-shaped heat seal is formed as a first step and an annular linear heat seal is formed as a second step. The heat-sealed container according to the item.