JPH0662175B2 - Partially openable sealed container - Google Patents

Description

Description: [Industrial field of application] The present invention relates to a sealed container in which a lid can be partially opened, and is used as a disposable container for storing food and drink.

[Conventional technology]

Sealed containers with sheet-shaped lids heat-sealed in their openings are used in many fields, but for example, when storing beverages,
Since leakage is very inconvenient, it is important that the sealing property is good and the peeling is not easy.

However, if it is difficult to peel off the lid at the time of consumption, you have to cut it with a knife or pierce the straw, which is inconvenient. Another sealing member, such as a label, may be attached to the cut portion and the opening may be formed in the lid by peeling the sealing member when used.

However, it is necessary to provide holes or cuts in the lid in advance and seal this part with another label, etc., which makes the cost expensive, and the sealing property and peeling resistance of this sealing part are also high. There is a problem that I have to keep in mind.

[Problems of the Invention]

Therefore, the object of the present invention is to have excellent sealing property and peel resistance,
And to provide a hermetically sealed container having a lid which can be easily provided with a partial opening.

[Means for solving problems]

According to the present invention, in order to solve the above-mentioned problems, a whole surface peeling layer on the outer surface, an adhesive layer on the inner surface, a lid made of a laminate containing a thermoplastic sealing layer on the innermost surface, to the container body by the sealing layer. In a heat-sealed sealed container, the adhesive layer is formed intermittently, and the peel strength of the entire surface peeling layer by this layer is made weaker than the peel strength of the lid by the sealing layer with respect to the container body, and the partial opening is performed. In the area corresponding to (1), the adhesive layer is continuously provided, and the adhesive strength to the entire surface peeling layer is made stronger than the breaking strength of the inner layer portion than the adhesive layer including the sealing layer.

[Action]

As described above, by weakening the peel strength of the adhesive layer, the outer surface peeling layer is easily peeled by hand, and when the continuous adhesive layer is reached, the inner layer portion is broken. Since the adhesive strength is greater than the strength, pulling the release layer causes the portion of the inner layer corresponding to the continuous adhesive layer to rupture and remain attached to the release layer, while being removed from other portions.
An opening is formed.

〔Example〕

As shown in FIG. 1, the opening 2 of the container body 1 is provided with a flange 3 on the periphery thereof, and the lid 1 is provided on both sides of the flange 3.
0 is heat sealed to form a sealed container.

The shape of the container body 1 is arbitrary. It may be round or square. Also, the material can be variously selected as long as it can be heat-sealed with the lid 10. It may be a single body or a laminated body.

The lid 10 includes a thermoplastic sealing layer 12 on a lower surface of a base material 11,
The printing layer 13 is laminated on the upper surface, and the entire release layer 15 on the outer surface is further laminated with an adhesive layer 14 interposed therebetween.
3 includes an overcoat layer.

The base material 11 may be a single material or a composite material such as aluminum foil, paper, and synthetic resin film, but it is preferable that the base material 11 has a relatively small breaking strength.

The sealing layer 12 is made of a thermoplastic synthetic resin having good adhesion to the container body 1, such as polyethylene, polypropylene, polyester, EVA, a blended resin of polyethylene and polypropylene, and is formed by coating, extrusion, film bonding, or the like. It

The outer surface peeling layer 15 is preferably made of a material that is relatively tough and is not easily broken, and synthetic resin film, synthetic paper, paper, metal foil, or the like is used.

Next, as the adhesive layer 14, for example, a dry lamination adhesive is used, but as shown in FIG.
Area 16 corresponding to 0 and area 17 corresponding to partial opening
Are continuous layers, and the other areas 18 are intermittent layers. This area 18 is, as shown, coated with adhesive in dots, as well as spaced lines, grids,
Various patterns such as stripes can be selected.

By forming the intermittent layers as described above, the adhesive strength of this area 18 is weakened, and the base material 11 by the sealing layer 12 is formed.
The peeling strength of the peeling layer 15 is set to be smaller than the peeling strength of.

Further, the area 17 corresponding to the partial opening strengthens the adhesive strength as a so-called solid coating, that is, a continuous layer, and the layers 13, 11, 1
It is made larger than the breaking strength of the laminated body of No. 2.

The opened state of the sealed container as described above will be described.

First, as shown in FIG. 2, cuts 4 or perforations are provided on the lower surface of the flange 3 in advance, and a few bends are made along the cuts 4 to rupture a part of the flange 3 and shown in FIG. Thus, when the portion of the tab 20 is pulled up, the portion outside the notch 4 is broken until it is fixed to the peeling layer 15, and the portion inside the notch 4 is adhesive layer 14.
Remove with.

Then, when the area 17 of the layer 14 is reached, since the adhesive strength of that portion is increased, the layers 13, 11, and 12 are pulled up together with the layer 14 and broken, and the partial opening 19 is formed.

As shown in FIG. 3, when the area 16 corresponding to the tab 20 of the adhesive layer 14 is a continuous layer, when peeled off as shown in FIG. 15
There is no risk of peeling and separation, and the peeling layer 15 can be prevented from peeling off from the tab portion during handling such as transportation.

FIG. 5 shows another example of the lid 10. As shown,
The lid 10 comprises a thermoplastic sealing layer 12 provided with a substrate 11 and a printing layer 13 via an adhesive layer 14.

The sealing layer 12 is made of a thermoplastic synthetic resin film such as polyester, polypropylene, polystyrene, a blend resin of polyethylene and polypropylene, or a laminated body thereof, and the base material 11, layers 13 and 14 are the same as those described above. Good.

In addition, in the case of FIG. 2, the cut 4 is provided on the lower surface of the flange 3, but only the tab 20 of the lid 10 may be projected outward from the flange 3 as shown in FIG.

In the case of peeling, as shown in FIG. 6, when the tab is held and pulled up, the sealing layer 12 is broken at the outer peripheral edge portion of the flange 3, and subsequently peeling occurs at the adhesive layer 14, In the area 17 not shown, the sealing layer 12 is also broken to form a partial opening. In this case, as is clear from the figure, the base material 11 functions as a release layer.

The area 16 in FIG. 3 does not have to be a continuous layer, and may be an intermittent layer similar to the area 18.

[Effect] According to the present invention, as described above, the peeling layer is provided on the outer surface of the lid via the adhesive layer, and the peeling strength of the peeling layer is made weaker than the peeling strength of the lid with respect to the container body, and thus the peeling strength can be increased. Since the peeling layer is made peelable and the adhesion strength of the peeling layer to other layers is strengthened, the partial opening can be easily formed by pulling up the peeling layer, and the container body is sealed as much as possible. The strength can be increased, the sealing performance becomes extremely excellent, and accidental opening of children can be prevented. Moreover, the peeling layer serves as a protective layer to increase the strength of the lid and protect the contents. An excellent sealed container can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a sealed container, FIG. 2 is a partially enlarged sectional view of the same, and FIG. 3 is a transverse sectional view of an adhesive layer of a lid,
FIG. 4 is a sectional view showing an opened state of the hermetically sealed container, FIG. 5 is a partially enlarged sectional view showing another embodiment of the hermetically sealed container, and FIG. 6 is a sectional view showing the opened state of the same. 1 ... Container body, 3 ... Flange, 4 ... Notch, 10 ... Lid,
11 ... Substrate, 12 ... Thermoplastic sealing layer, 13 ... Printing layer, 1
4 ... Adhesive layer, 15 ... Release layer, 16, 17 ... Continuous layer area, 18 ... Intermittent layer area

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 54-88491 (JP, A) Actual development 57-156474 (JP, U) Actual public 55-14229 (JP, Y2)

Claims (1)

[Claims] 1. A full release layer on the outer surface, an adhesive layer on the inner surface,
A lid made of a laminate including a thermoplastic sealing layer on the innermost surface, in a sealed container in which the container body is heat-sealed by the sealing layer, the adhesive layer is intermittently formed, and the entire release layer of the layer is formed. The peeling strength is made weaker than the peeling strength of the sealing layer with respect to the container body, and the portion corresponding to the partial opening of the lid is provided with the adhesive layer continuously, and the adhesive strength to the entire peeling layer is A partially opened hermetically sealed container characterized in that the breaking strength of the sealing layer is stronger than the breaking strength.