JP2557663B2 - Sealed container - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hermetically sealed container including a container body made of synthetic resin and a lid body heat-welded to a mouth salt portion of the container body. Provided is a hermetically-sealed container which has a good storage performance for the inner-sealed material contained in the container body and can be used for cooking in a microwave oven.

[Prior Art] In a hermetically sealed container filled with processed foods and the like, a lid body having an aluminum foil layer, which has an extremely excellent gas barrier property, is provided in order to improve the preservation performance for the enclosed product. Various sealed containers that are heat-welded to the rim of the container body are used.

[Problems to be Solved by the Invention] By the way, although the above-described conventional sealed container using the lid including the aluminum foil layer has an excellent effect on the storage performance of the inner package as described above, The drawback was that it was not suitable for cooking in a microwave oven.

For this reason, the lid in the sealed container is composed of a laminate of an outer layer made of an aluminum foil layer and an inner layer made of a synthetic resin layer not having an aluminum foil layer, and immediately before being provided for cooking in a microwave oven. Although a sealed container in which only the outer layer is peeled off from the inner layer has been proposed, this hermetically sealed container has unstable peel strength when peeling only the outer layer consisting of the aluminum foil layer from the inner layer, and the product is in a distribution stage. There is a drawback that the outer layer and the inner layer are separated, and that the entire lid is separated from the container mouth part by the operation to peel off only the outer layer immediately before cooking with a microwave oven. ing.

On the other hand, in the sealed container of the present invention, the outer layer having the aluminum foil layer and the inner layer made of the synthetic resin layer having no aluminum foil layer in the lid are separated from each other during the distribution stage of the product. Features that do not cause unforeseen circumstances, that it is easy to separate and remove only the outer layer from the lid immediately before cooking with a microwave oven, and that the interlayer separation between the outer layer and the inner layer can be performed in an orderly manner. It is possible to provide a sealed container having:

[Means for Solving the Problems] The hermetically sealed container of the present invention comprises a container main body containing an internal filler and a lid body heat-welded to the rim of the container main body. .

The lid of the hermetically sealed container has a tab portion that serves as a tab, and includes an outer layer having an aluminum foil layer and a synthetic resin layer that does not have the aluminum foil layer. It is composed of a laminated body with an inner layer which is heat-welded to the edge portion of the.

The outer layer and the inner layer of the laminate forming the lid of the hermetically sealed container are substantially evenly formed over the entire surface of the inner layer (that is, the surface facing the outer layer). And a second release agent layer partially formed on the back surface of the outer layer (that is, the surface facing the inner layer) only in the tab portion of the lid body, and the first release agent layer and the second release agent layer. Which is adhered and laminated by an adhesive layer composed of an olefin resin layer interposed between the agent layer and
In addition, the laminated body constituting the lid body has the interlayer strength [A] between the olefin resin layer and the second release agent layer in the laminated body, and the olefin resin layer and the second peeling agent layer. Layer strength [B] between the first release agent layer and the inner layer, and the layer strength [B] between the back surface of the inner layer and the rim of the container body. Strength between layers [D]
And the interlaminar strength [A] <interlaminar strength [B] <interlaminar strength [C], and interlaminar strength [B] <interlaminar strength [D], and the interlaminar strength [B] is 20 to 120 g. / 1
It is within the range of 5 mm width.

The inner layer in the lid of the hermetically sealed container of the present invention having the above-mentioned structure is composed of a base material made of a heat-resistant film such as polyethylene terephthalate, polyamide, polypropylene, polycarbonate, or polyimide, and a heat sheet layer laminated on the base material. In general, the inner layer is used for cooking in a microwave oven while being heat-welded to the container body, so that the water vapor generated by heating the inner filling in the container body is In order to be able to be dissipated from the inner layer, the inner layer is usually provided with a ventilation hole of an arbitrary shape on the whole surface or a part thereof, and the air permeability is usually adjusted to 10 seconds or less.

Further, the aluminum foil layer in the outer layer of the lid body has a gas barrier property, printability, mechanical suitability of the lid body at the time of heat welding to the rim portion of the container body, etc.
It is preferable to use one having a thickness of about 20 to 40 μm.

In addition, the interlayer strength between the second release agent layer and the olefin resin layer on the back surface of the outer layer of the lid [A]
Similarly, the adjustment of the interlayer strength [B] between the first release agent layer and the olefin resin layer on the surface of the inner layer is
The above-mentioned interlayer strength [A] is about 0 to 20 g / 15 mm width, preferably 10 g / 15 mm width or less, and the interlayer strength [B] is 20 to 120 g / 15 mm.
The width, preferably about 50 to 100 g / 15 mm width. These interlayer strengths include, for example, a polyamide resin, a vinyl chloride / vinyl acetate copolymer resin of 50% by weight or more of the second release agent layer in which about 2 to 50% by weight of a silicone resin is added, or these The first release agent layer is formed of a polymer layer of a mixed resin, and 80% by weight or more of the first release agent layer is either polyester urethane or polyester polyol, and 0 to 2% by weight of a silicone resin is added thereto. It is preferably formed of a polymer layer.

[Examples] Hereinafter, specific configurations of the sealed container of the present invention will be described based on manufacturing examples.

Example 1 A 40 μm-thick aluminum foil and a 12 μm-thick polyethylene terephthalate film were bonded together using an adhesive to obtain a laminated sheet, and a printing layer was printed on the aluminum foil surface of the obtained laminated sheet. On the surface of the polyethylene terephthalate film, a coating agent consisting of 90 parts by weight of polyamide resin, 5 parts by weight of pigment, and 3 parts by weight of silicone resin was applied on a gravure plate with a plate depth of 50 μm.
Only the portion corresponding to the tab in the disk-shaped lid was coated to obtain a laminated sheet for the outer layer of the lid.

On the other hand, after sticking a polyethylene terephthalate film having a thickness of 12μ and a polyolefin resin film having a thickness of 30μ with an adhesive, on the ethylene terephthalate film surface, a gravure plate having a plate depth of 40μ, a thickness of polyester polyether resin Forming a 2μ coating layer,
Next, 100 holes / 10 cm ² were formed with holes having a diameter of 0.3 mm to obtain a laminated sheet for the inner lid layer having an air permeability of 0.2 seconds.

Then, between the polyethylene terephthalate film surface of the laminated sheet for the outer layer of the lid and the coating layer surface of the polyester polyether resin of the laminated sheet for the inner layer of the lid, a density of 0.918 and a low melt index of 8 are provided therebetween. The density polyethylene resin is extruded to a thickness of 20μ at 300 ° C and is affixed while being interposed.
The material for the lid was obtained.

Next, the lid material is punched out into a disc having a diameter of 72 mm, and the lid has a laminated structure indicated by reference numeral 20 in FIG. 2, that is, an aluminum foil layer 21 having a thickness of 40 μ and a polyethylene terephthalate having a thickness of 12 μ. Outer layer consisting of film layer 22
23, an inner layer 26 composed of a polyethylene terephthalate film layer 24 having a thickness of 12 μ and a polyolefin resin film layer 25 having a thickness of 30 μ, a first release agent layer 27 composed of a coating layer of a polyester polyol resin, and a polyamide resin 2nd release agent layer 28 consisting of a coating layer containing as a main component, and an olefin resin layer made of polyethylene
A lid 20 that is adhered and laminated with an adhesive layer 31 composed of 29
I got

In the lid 20 shown in FIG. 2, the portion indicated by the symbol M is a printed layer, the portion indicated by the symbol S is an adhesive, and the portion indicated by the symbol 30 is a perforation hole. is there.

Further, the lid 20 is attached to the mouth / neck of a container body having an outer diameter of 72 mm and a capacity of 180 cc filled with consomme soup, and the olefin resin film layer 25 in the lid 20.
Was heat-sealed and fixed at 200 ° C. and 100 kg / cm ² for 1.5 seconds to obtain a hermetically sealed container as an Example 1 product of the present invention.

When the hermetically-sealed container was transported by 1000 km by truck, no abnormality such as peeling of the heat-sealed portion or liquid leakage occurred in the hermetically-sealed container.

Further, when the sealed container after the transportation is peeled off and removed from the outer layer 23 portion of the lid body 20 by using the tab portion of the lid body 20, the lid body 20 is as shown in FIG. A first release agent layer and a second release agent layer 28, and an olefin resin layer
It was completely and easily peeled off at the interface with 29.

Further, the container after the outer layer 23 of the lid 20 is peeled off, when heated in a microwave oven of 600 W for 90 seconds, there is no peeling of the seal between the container body and the polyolefin resin film layer 25, and the container The consommé soup was heated to 95 ° C without any deformation of the body.

Next, when the inner layer 26 welded to the container body was peeled off using the tab portion of the lid body 20, it was completely peeled off from the neck of the container.

[Operation and Effect of the Present Invention] The hermetically sealed container of the present invention comprises a container main body in which an internal filler is filled, and a lid body heat-welded to the rim of the container main body. The lid body has a tab portion, and the lid body is composed of an outer layer having an aluminum foil layer and a synthetic resin layer having no aluminum foil layer, and the back surface of the lid body is the rim of the container body. It is a laminated structure composed of an inner layer heat-welded to the section,
The outer layer and the inner layer are partially formed on the back surface of the outer layer only in the first release agent layer which is formed substantially evenly over the entire surface of the inner layer and the tab portion of the lid. And a second release agent layer and an olefin resin layer interposed between the first release agent layer and the second release agent layer. In addition, in the laminate, the interlayer strength [A] between the second release agent layer on the back surface of the outer layer and the olefin resin layer in the laminate and the first surface of the inner layer are the same. Interlayer strength [B] between the release agent layer and the olefin resin layer, the interlayer strength [C] between the back surface of the inner layer and the rim of the container body, and the first release agent layer. And the interlaminar strength [D] between the inner layer and the surface of the inner layer are: interlaminar strength [A] <interlayer strength [B] <interlayer strength Degree [C] and interlayer strength [B] <interlayer strength [D], and the interlayer strength [B] is 20 to 120 g / 1.
It is within the range of 5 mm width.

Therefore, in the hermetically sealed container of the present invention, an outer layer having an aluminum foil layer and an inner layer made of a synthetic resin layer having no aluminum foil layer in the lid of the hermetically sealed container are separated at the stage of product distribution. There is no unforeseen situation, and it is easy to separate and remove only the outer layer from the lid immediately before cooking with a microwave oven.
In addition, the function and effect such that the interlayer separation between the outer layer and the inner layer can be performed in an orderly manner are exhibited.

[Brief description of drawings]

FIG. 1 shows one embodiment of the sealed container of the present invention,
FIG. 2 is a model cross-sectional view showing the separated state of the outer layer and the inner layer when only the outer layer in the lid is separated and removed, and FIG. 2 is a model cross-sectional view of the laminated structure of the lid in the sealed container shown in FIG. . 20: Lid, 21: Aluminum foil layer, 23: Outer layer, 26: Inner layer, 2
7: first release agent layer, 28: second release agent layer, 29: olefin resin layer, 31: adhesive layer.

Claims (3)

(57) [Claims] 1. A hermetically sealed container in which a lid having a tab portion is heat-welded to an edge portion of a container body, wherein the lid includes an outer layer having an aluminum foil layer and an aluminum foil layer. A non-synthetic resin layer whose inner surface is heat-welded to the rim of the container body, and the outer layer and the inner layer are formed substantially uniformly over the entire surface of the inner layer. A first release agent layer, a second release agent layer partially formed on the back surface of the outer layer only at the tab portion of the lid, the first release agent layer and the second release agent layer. The olefin resin layer and the olefin resin layer in the lid are adhered and laminated by an adhesive layer including an olefin resin layer interposed between the release agent layer and the second olefin resin layer.
[A] between the release agent layer and the interlayer strength [B] between the olefin resin layer and the first release agent layer, and the back surface of the inner layer and the rim of the container body. Between the first peeling agent layer and the surface of the inner layer [D] is as follows: Interlayer strength [A] <Interlayer strength [B] <Interlayer strength [C] ], And interlayer strength [B] <interlayer strength [D], and the interlayer strength [B] is 20 to 120 g / 1.
A sealed container characterized by having a width of 5 mm. 2. An inner layer made of a synthetic resin layer which does not include an aluminum foil layer, and the whole or a part of the inner layer has ventilation holes with an air permeability of 10 seconds or less. A one-hole sealed container. 3. The first release agent layer and the second release agent layer are composed of a polyamide resin, vinyl chloride vinyl acetate copolymer, polyester polyurethane, polyester polyol, nitrocellulose, silicone, or a combination thereof. The sealed container according to claim 1 or 2, which is claimed.