JP2001301802A - Lid and container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container, particularly a lid thereof, wherein heat treatment of contents can be well performed and no deformation occurs after heating is stopped. SOLUTION: The lid includes a lid base, a degassing hole formed on the lid base and a cover peelably stuck to an upper surface of the lid base to cover the degassing hole. A glued portion sticking the lid base to the cover is provided in the vicinity of the degassing hole, while an unglued portion not sticking the lid base to the cover is provided in the vicinity of the glued portion. A pore is formed at least in a region corresponding to the unglued portion on the cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container filled with foodstuffs such as soups or retort foods, and more particularly to a container of a type in which all the foodstuffs are heated using a microwave oven (in particular, the structure of the lid thereof). ).

[0002]

When foods such as soups and retort foods are heated by a microwave oven, the foods are once taken out of a sealed container.
It had to be transferred to another container. However, such an operation is very time-consuming, and there is a risk of accidentally spilling food during the transfer.

[0003] In order to solve such a problem, a container which can be heated in a microwave oven recently without the need to transfer it to another container has been developed in order to solve such a problem. Was. Here, the structure of the container will be briefly described with reference to FIG.

[0004] As can be seen from the figure, the above-mentioned container which can be directly heated in a microwave oven has a container body 31 made of paper or plastic which is a non-metallic material, and a lid made of paper or plastic which is also a non-metallic material. 32.

The lid 32 has a double structure.
That is, the lid substrate 34 in which the holes 33 for gas release are formed.
And a cover body 36 adhered to the lid substrate 34 via an adhesive layer 35.

Accordingly, in the same container, when the internal pressure is increased by heating, the cover body 36 is spontaneously peeled off from the lid substrate 34, and gas (steam) is discharged from the gas releasing hole 33. There is no spontaneous separation from the main body 31. As a result, the food ingredient F ′, which is the content, can be moderately heated.

[0007] However, such containers also have the following points of need for improvement. That is, during heating,
As described above, the treatment is performed well, but when heating is stopped and the container is removed from the microwave oven, the container is deformed (collapsed).
Often do. This phenomenon is considered to be caused by the following reasons.

At the time of heating, the air originally present in the container is discharged to the outside through the vent hole 33 together with the water vapor. Thereafter, when the heating is stopped, the cover body 36 returns to the state before the heating due to its own restoring force. That is, it comes into close contact with the lid substrate 34 again.

When the heating is stopped and the container is taken out of the microwave oven, the container is cooled by the outside air, and the internal water vapor starts to condense. However, since the air originally present in the container has already been discharged as described above, when the water vapor starts to condense, the pressure in the container becomes negative.

As a result, the container is deformed (crushed) by the atmospheric pressure. However, such deformation of the container poses a major obstacle in handling it, and urgent improvement is desired.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a container, in particular, a lid which can be satisfactorily heat-treated and which does not deform after the heating is stopped.

[0012]

This object is achieved by a cover substrate,
A gas vent hole formed in the lid substrate, and a cover body removably adhered to an upper surface of the lid substrate to cover the gas vent hole; Around the hole, an adhesive portion for bonding the lid substrate and the cover body is provided. Around the adhesive portion, a non-bonded portion between the lid substrate and the cover body that is not bonded is provided. The problem is solved by a lid characterized in that an adhesive portion is provided, and pores are formed in at least a region of the cover body corresponding to the non-adhesive portion.

It is preferable that a gas vent hole is formed at the center of the lid substrate so as to make the contents more difficult to spill when the container opening is closed.

Further, it is preferable that a foaming agent which foams when heated and solidifies while the apparent volume is increased is applied to a region corresponding to the non-adhered portion of the lid substrate. .

[0015] With this configuration, a larger gap is formed between the lid substrate and the cover during heating than in the case where it is not applied, so that the gas (eg, water vapor) generated by heating is formed. Will be discharged more smoothly. For the same reason, after the heating is stopped, the outside air is more smoothly introduced into the container.

In order to more efficiently guide gas such as water vapor to the pores of the cover, the foaming agent crosses the pores formed in the cover along the radial direction of the cover substrate. As described above, it is preferable that the cover is applied to the lid substrate.

Since the container in which the lid is disposed is mainly heated by a microwave oven, the lid substrate and the cover body constituting the lid are made of a nonmetallic material, especially paper or plastic (for example, polystyrene, (Olefin resins such as polypropylene and polyethylene), and more preferably, a laminate thereof.

Another object of the present invention is to provide a container constructed by using the lid, wherein the container is provided with an opening, and the container is provided with an adhesive so as to close the opening of the container. When the internal pressure is increased by heating, a part of the cover body in the lid is spontaneously peeled off from the lid substrate, and gas is released from the gas vent holes of the lid substrate and the pores of the cover body. However, the problem is solved by a container characterized in that the lid is configured not to peel off naturally from the container body.

As described above, the container of the present invention is mainly heated by a microwave oven.
It is preferable that not only the lid substrate and the cover body constituting the lid, but also the container body be made of a nonmetallic material, for example, paper or the above-mentioned various plastics. In particular,
This container body can be composed of a laminated material of plastics, a laminated material of papers, a laminated material of plastic and paper, etc. in order to enhance the heat retaining function.

As described above, in the present invention, the lid substrate having the gas vent hole formed therein and the upper surface of the lid substrate are releasably bonded to cover the gas vent hole. In the lid including the cover body, an adhesive portion for bonding the lid substrate and the cover body is provided around the gas vent hole, and the lid substrate and the cover are provided around the adhesive portion. A non-adhesive portion that does not adhere to the body is provided, and pores are formed in at least a region of the cover body corresponding to the non-adhesive portion.

Therefore, in a container constructed using this lid, that is, a container having a structure in which this lid is disposed on the container body so as to cover the opening of the container body, gas is generated by heating, and the internal pressure increases. This gas causes the cover body to spontaneously peel off from the lid substrate. Then, the gas is appropriately discharged to the outside from the pores of the cover body through the vent holes of the lid substrate. Therefore, the internal pressure of the container is always maintained at a preferable value, and as a result, the contents are heated well.

When the heating is stopped, the temperature decreases and the gas inside the container starts to condense, and the inside of the container tends to become a negative pressure. However, when the lid according to the present invention is used, since the outside air is introduced into the container from the pores of the cover body, the inside of the container does not become a negative pressure, and therefore, heating is stopped, and the container is left as it is. The container does not deform (collapse). As a result, there is no problem that the handling of the container becomes difficult after heating due to deformation of the container.

Note that the pores referred to in this specification may be in any form as long as they have a function of transmitting gas (such as water vapor or air). As an example thereof, a relatively large opening such as a cut (a gap is substantially zero), a slit (a slight gap), a circular hole, and a group of pinholes (pores) are given.

Incidentally, as the adhesive used for bonding the lid of the present invention to the container body, for example,
Thermally bondable resins such as polypropylene, polyethylene, ethylene-acrylic resin, and ethylene-vinyl acetate resin can be used.

On the other hand, as the adhesive used for bonding the lid substrate and the cover, those listed here can be used. However, in this case, an adhesive having lower bonding strength than that used for bonding the lid and the container body is used for bonding the lid substrate and the cover body.

In addition, for the adhesion between the lid substrate and the cover,
In addition to the above-mentioned adhesives, adhesives containing polyurethane, acrylic resin, wax and the like can be used.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A lid described below as a first embodiment of the present invention has a lid substrate, a gas vent hole formed in the lid substrate, and a gas vent hole. A cover body releasably bonded to the upper surface of the lid substrate, and an adhesive portion (particularly a ring-shaped portion) bonding the lid substrate and the cover body around the gas vent hole And a non-adhesive part that does not adhere the lid substrate and the cover body is provided around the adhesive part, and at least the non-adhesive part in the cover body is provided. Is characterized in that pores (particularly, cuts) are formed in the region corresponding to. In particular, in the present embodiment, the gas vent hole is formed at the center position of the lid substrate.

A lid, which will be described below as a second embodiment of the present invention, has the same basic structure as that of the first embodiment, but has a region corresponding to a non-bonded portion on the lid substrate. Is characterized by further applying a foaming agent which foams when heated and solidifies in an expanded state with an increased apparent volume. In particular,
In the second embodiment, the foaming agent is applied to the cover substrate along the radial direction of the cover substrate and so as to intersect the pores formed in the cover body.

In both the first embodiment and the second embodiment,
In order to be able to cope with heating in a microwave oven, a cover made of a nonmetallic material, in particular, plastic is used as the lid substrate and the cover.

A container described below as an embodiment of the present invention is constituted by using the lid of the first embodiment, and has a container main body having an opening, and an opening of the container main body being closed. And the lid disposed on the container body by adhesion, and when the internal pressure increases by heating, a part of the cover body in the lid spontaneously peels off from the lid substrate to release the gas from the lid substrate. Although the gas is vented from the holes for use and the pores (especially the cuts) of the cover body, the lid is configured not to be spontaneously separated from the container body.

Here, as in the case of the lid substrate and the cover body, a container body made of a nonmetallic material, particularly plastic is used.

Subsequently, the first embodiment of the present invention will be described with reference to FIGS.
The embodiment will be described more specifically. 1 is a schematic cross-sectional view of the container according to the present embodiment, FIG. 2 is an enlarged cross-sectional view of a main part of the lid according to the present embodiment, FIG. 3 is a plan view of the lid, and FIGS. It is a principal part expanded sectional view which shows the function of the lid concerning this.

The container according to the present embodiment (hereinafter referred to as the present container) is constituted by using a lid according to a first embodiment of the present invention, which will be described later in detail. The inside is filled with food F such as soup, and the container is heated in a microwave oven together with the food F.

As shown in FIG. 1, the container has a cup-shaped container body 1 having an opening 1a, and an opening edge of the container body 1 by bonding so as to close the opening 1a of the container body 1. And a lid 2 disposed in the section. Lid 2
The knob 2a by extending a part of the periphery thereof.
Are formed.

Of the above components, the container body 1 is made of a non-metallic material, particularly plastic such as styrene foam, and the lid 2 is bonded to the annular rim 1b formed at the opening edge as described above. Will be done.

On the other hand, as can be seen from FIGS. 2 and 3, the lid 2 has a lid substrate 11 in which a gas vent hole 11a is formed at a center position, and a lid substrate 11 which covers the gas vent hole 11a. Cover body 12 releasably adhered to the upper surface of
And In other words, the lid 2 is
On the other hand, it has a three-layer structure in which the cover body 12 is adhered via the adhesive layer 13.

More specifically, the gas vent 1
An annular bonding portion (dotted area in FIG. 3) 1 bonding the cover substrate 11 and the cover body 12 is provided around the periphery of 1a (more precisely, around the gas vent hole 11a).
4 are provided.

In addition, around the annular bonding portion 14,
A non-bonded portion (a gap here) 15 where the cover substrate 11 and the cover body 12 are not bonded is provided. Further, around the non-adhesion portion 15, an annular adhesion portion (a region shown by a mesh pattern in FIG. 3) 16 for adhering the lid substrate 11 and the cover body 12 is provided.

In the present embodiment, cuts (pores) 17 are formed in the cover body 12 in a region corresponding to the non-adhesive portion 15. In addition, this break 17
May be discontinuous as shown in FIG. 3 or may be continuous. Furthermore, this break 17
May straddle the bonding portion 16.

In this embodiment, the lid substrate 11 and the cover 12 have the same shape. Like the container body 1, the lid substrate 11 and the cover body 12 are also made of a nonmetallic material, particularly a plastic (for example, a polyolefin such as polyethylene or polypropylene, polyester, or polyamide) film.

Further, polyurethane or acrylic is used for the adhesive constituting the adhesive layer 13.
In the present embodiment, the adhesive strength between the lid substrate 11 and the cover body 12 is set to 0.294 to 19.6 N / 15 mm (30 mm).
２０００2000 gf / 15 mm).

The container constructed as described above is heated by the microwave oven while the foodstuff F is accommodated. At that time, the lid 2 functions as follows.

That is, when the internal pressure increases due to heating and reaches a specified value, the adhesive layer 13 is vertically separated. That is, a part of the cover body 12 in the lid 2 is naturally separated from the lid substrate 11. As a result, gas (water vapor or air originally present in the container) enters between the lid substrate 11 and the cover body 12 from the vent hole 11a. Finally, this gas is discharged outside through the cut 17 of the cover body 12 (see FIG. 4).

In other words, when the lid 2 is used, gas is vented from the gas vent hole 11 a of the lid substrate 11 and the cut 17 of the cover body 12 (in this case, however, the lid 2 is used). It does not peel off itself from the container body 1). In this way, the gas in the container is efficiently discharged to the outside and discharged at a flow rate that maintains the required internal pressure, so that the food F in the container is moderately heated.

Next, when the heating is stopped and the container is taken out of the microwave oven, the gas (water vapor) inside the container starts to condense due to the temperature drop, and the inside of the container tends to become a negative pressure. However, in the case where the lid 2 is used, the outside air flows from the gap 17 of the cover body 12 into the gas vent hole 11 of the lid substrate 11.
Through a, it is introduced into the container (see FIG. 5).

Therefore, the inside of the container does not become negative pressure, and therefore, even if the heating is stopped and the container is left as it is, the container does not deform (crush). Therefore, there is no problem that the container becomes difficult to handle after heating due to deformation of the container.

Next, a second embodiment of the present invention will be specifically described with reference to FIGS. However, FIG. 6 is a plan view of the lid according to the present embodiment, and FIG. 7 is an enlarged sectional view of a main part showing the function of the lid. The basic technical concept and the overall structure of this embodiment are the same as those of the first embodiment. Therefore, the following description focuses on the differences from the first embodiment.

The lid of this embodiment is also provided with a lid substrate 21 in which a gas vent hole 21a is formed, and a lid substrate 21 through an adhesive layer 22 so as to cover the gas vent hole 21a.
And a cover body 23 releasably adhered to the upper surface of the cover. Around the gas vent hole 21a, there is provided an annular adhesive portion (dotted area in FIG. 6) 24 which adheres the lid substrate 21 and the cover body 23.

Also, around the annular bonding portion 24,
A non-adhesion portion (a gap here) 25 in which the lid substrate 21 and the cover body 22 are not adhered is provided. Further, around the non-adhesion portion 25, an annular adhesion portion (region shown by a mesh pattern in FIG. 6) 26 for adhering the lid substrate 21 and the cover body 22 is provided. In addition, the cover body 23
A discontinuous cut 27 is formed in a region corresponding to the non-bonded portion 25 in FIG.

In the present embodiment, the foaming agent is applied to the area corresponding to the non-adhesive portion 25 of the lid substrate 21 at a total of four places (the applied foaming agent layer is 28 in FIG. 6).
And the expanded blowing agent is indicated by 28 'in FIG. 7).
This foaming agent foams when heated (heated to the food cooking temperature) and solidifies in an expanded state with an apparent volume increased. Specifically, a so-called foamed ink (for example, trade name "Nonstop Weld" / manufactured by Salt River Technical Center) is used.

In the present embodiment, the foaming agent is applied along the radial direction of the lid substrate 21. In particular, the foaming agent is applied to the cover substrate 21 so that a part of the layer 28 of the foaming agent obtained by the application intersects with the cut 27 formed in the cover body 23.
Has been applied.

However, this foaming agent layer 28 is
No adhesion (adhering) to No. 3. The application pattern is
Various things other than the present embodiment are conceivable.

When such a structure is adopted, as shown in FIG. 7, when the food material F is heated, the space between the lid substrate 21 and the cover body 23 is further expanded by the expansion of the foaming agent as compared with the case of the first embodiment. Large voids are formed. For this reason, the gas (such as water vapor) generated by the heating is more smoothly discharged to the outside. For the same reason, after the heating is stopped, the outside air is more smoothly introduced into the container.

[0054]

According to the present invention, the contents are heat-treated well, and the container is not deformed even after the heating is stopped.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a container according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the lid according to the first embodiment of the present invention.

FIG. 3 is a plan view of a lid according to the first embodiment of the present invention.

FIG. 4 is an enlarged view of a main part showing functions of the lid according to the first embodiment of the present invention.

FIG. 5 is an enlarged view of a main part showing a function of the lid according to the first embodiment of the present invention.

FIG. 6 is a plan view of a lid according to a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part showing a function of a lid according to a second embodiment of the present invention.

FIG. 8 is a sectional view showing the structure of a conventional container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Lid 11 Lid substrate 11a Gas vent hole of lid substrate 12 Cover body 13 Adhesive layer 14 Adhesive part 15 Non-adhesive part 16 Adhesive part 17 Cut (pore) of cover body F Food material

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B65D 81/34 B65D 81/34 U F term (Reference) 3E067 AA03 AA11 AB01 AB26 BA07A BB01A BB15A BB16A BB17A BB26A BC07A EA04 EA37 EE35 EE37 GB01 GD08 3E084 AA02 AA12 AB01 BA02 BA03 BA07 BA08 BA09 CA01 CB01 CB04 CC03 CC07 CC08 FA09 FD13 GB08 GB12 GB17 HA01 HB01 HD01 KA02 KA15 KA19

Claims (7)

[Claims] A cover substrate, a gas vent hole formed in the cover substrate, and a cover body releasably bonded to an upper surface of the lid substrate so as to cover the gas vent hole. Around the hole for degassing, an adhesive portion for bonding the lid substrate and the cover body is provided, and around the adhesive portion, the lid substrate and the A lid provided with a non-adhesive part that is not adhered to the cover body, wherein pores are formed in at least a region of the cover body corresponding to the non-adhesive part. 2. The lid according to claim 1, wherein the gas vent hole is formed at a center position of the lid substrate. 3. A foaming agent, which foams when heated and solidifies while increasing the apparent volume, is applied to a region corresponding to the non-adhered portion of the lid substrate. The lid according to claim 1 or 2, wherein 4. A foaming agent is provided along a radial direction of the lid substrate,
4. The lid according to claim 3, wherein the lid is applied to the lid substrate so as to intersect with pores formed in the cover body. 5. 5. The lid according to claim 1, wherein the lid substrate and the cover are made of a nonmetallic material. 6. A container constituted by using the lid according to any one of claims 1 to 5, wherein a container main body having an opening is bonded to the container main body so as to close the opening of the container main body. The lid provided in the container body, when the internal pressure increases by heating, a part of the cover body in the lid is spontaneously peeled off from the lid substrate, and the vent hole and the gas release hole of the lid substrate are provided. A container characterized in that, although gas is vented from the pores of the cover body, the lid is configured not to spontaneously peel off from the container body. 7. The container according to claim 6, wherein the container body is made of a non-metallic material.