JPH05270545A - Heat sealing lid material for partially opening - Google Patents

Abstract

PURPOSE:To provide a lid material in which a partial opening can be easily provided without suck process that an opening knob is separately provided in advance and that a partial opening predetermined portion is strongly adhered. CONSTITUTION:A partial opening predetermined portion 6 is provided on a film layer 5 by joining the film layer 5 and a base material 2 which can seal a container with heat through a thin adhesive layer 3 and an adhesive layer 4. When an opening knob is pulled, under pressure of a hot plate in heat sealing, the film layer 5 is fractured on the peripheral edge of the heat sealing portion, and the base material 2 and the film layer 5 are separated from each other, and then the partial opening is formed by lifting together the partial opening predetermined portion with the base material 2 at the partial opening predetermined portion 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid material that can be used as a food packaging container for beverages, jellies, yogurts, etc., for applications in which the contents are spilled when it is fully opened and it is not necessary to fully open it.

[0002]

2. Description of the Related Art In the conventional partially opened heat sealing lid material, the opening knob is previously separated into upper and lower parts, and only the upper lid is peeled off, which requires a step of separating the opening knob for manufacturing, resulting in high cost. There was a problem. In addition, there is a case where a notch is formed in the container flange to break the lower lid in order to start opening instead of separating the opening knob, but this also has the same problem.

Further, in each case, a processing step is required to strengthen the adhesive force of the upper and lower lids so that the planned partial opening is moved to the upper lid side.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to form a partial opening without special processing.

[0005]

In order to solve the above-mentioned problems, in the present invention, a heat-sealable film layer having a predetermined partial opening in advance is weakly formed on one surface of a base material having no heat-sealing property. The adhesive layer and the adhesive layer are provided therebetween.

[0006]

As described above, by providing the heat-sealable base material and the heat-sealable film layer having the predetermined partial opening through the weak adhesive layer, heat fusion to the container flange can be achieved. Initial opening starts when the heat-sealed film layer is cut by the shearing force at the sealing head or container edge at the time of attachment, and then peeling at the interface between the substrate and the heat-sealed film layer including the weak adhesive layer. , And further, an opening is formed at a predetermined partial opening planned portion.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a lid member 1 comprises a base material 2 and a heat-sealable film layer 5 provided on one surface of a base material 2 via a weak adhesive layer 3 and an adhesive layer 4. Film layer 5
Is provided with a cut line or a perforation line 7 that partitions the planned partial opening portion 6.

As the base material 2, in addition to a metal foil such as an aluminum foil, a biaxially stretched polyester film or 2
An axially stretched nylon film or the like can be used. Further, the printing layer 8 and the overcoat layer 9 can be provided on the upper surface of the base material 2.

The weak adhesive layer 3 is made of a resin having a relatively low adhesive strength, for example, a single substance or a mixture of acrylic, polyamide, silicone, vinyl resin and the like, and the resin is partially coated on the substrate 2. The pattern of the coat may be dot-like, linear, checkered-like, or the like.

As the adhesive layer 4, a general two-component reactive adhesive of polyol and isocyanate is used.
The weak adhesive layer 3 is filled with the uncoated portion to control the adhesive force between the base material 2 and the film layer 5 together with the weak adhesive layer 3.

Here, the adhesive force between the substrate 2 and the heat-sealing film layer 5 is preferably about 30 g to 300 g / 15 mm width (T-type peeling). If it is less than 30 g, the film layer 5 may be thermally contracted and peeled off from the base material 2 at the time of heat sealing. This is because it cannot be formed.

As the film layer 5, a film that can be heat-sealed to an adherend such as a container flange is used. For example, when the adherend is polyethylene, a film of low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene or the like is used, and when the adherend is polypropylene, an unstretched polypropylene film or the like is used. Be done. For other adherends, a similar film may be used.

The thickness of the film layer 5 is preferably about 20 to 100 μm. If it is too thin, it will melt during heat sealing with the adherend, and if it is too thick, reliable breakage cannot be expected when opening.

The opening mechanism of the lid 1 will be described below.

As shown in FIG. 2 (a), when the lid member 1 is attached to the flange B of the container A by a heat ring C, so-called ring seal, as shown in FIG. 2 (b), the opening knob is opened. When 10 is gripped and pulled, initially the heat-sealing film layer 5
Peel off from the flange B, but the film layer 5 breaks at the outer peripheral edge of the ring seal portion D, the composite bonding layer 3-4 composed of the weak adhesive layer 3 and the adhesive layer 4 also breaks, and only the base material 2 peels off. Go. Then, when it reaches the position of cut 7, FIG.
As shown in (c), the planned partial opening 6 divided by the cuts 7
Is lifted together with the base material 2 to form a partial opening 6a as shown in FIG.

When heat-sealing is performed by using a normal hot plate E as shown in FIG. 3A, when the opening knob 10 is pulled up, as shown in FIG. The film layer 5 and the composite bonding layer 3-4 are broken at the edge portion, and the base material 2 is peeled off and separated from the film layer 5 as shown in FIG. 3C, but when the cut portion 7 is reached. The partial opening 6a (FIG. 4) is formed in the same manner as described above.

[0018]

According to the present invention, as described above, the heat-sealable film layer of the container and the base material are laminated via the composite bonding layer whose adhesive strength is manually separable, and the film layer is formed on the film layer. Since the partial opening scheduled portion is provided, after heat-sealing the lid material to the container, when the opening knob is pulled, the composite bonding layer is also broken at the same time that the film layer is broken at the outer peripheral edge pressed by the heat-sealing heat plate, Therefore, the base material is separated, and the film layer remains in the container, but when it reaches the partial opening scheduled portion, that portion is lifted together with the base material and the partial opening is formed, so the opening knob portion is separated in advance. In addition, it is not necessary to strongly adhere only the portion to be partially opened to the base material side, that is, the side of the member to be peeled off, and a lid material capable of reliably forming the partial opening can be obtained at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a lid member of the present invention.

FIG. 2 is a cross-sectional view showing an opening mechanism of the lid material of the same.

FIG. 3 is a cross-sectional view showing another opening mechanism of the same.

FIG. 4 is a perspective view showing a state of an opened container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid material 2 Base material 3 Weak adhesive layer 4 Adhesive layer 5 Heat-sealing film layer 3-4 Composite joining layer 6 Planned partial opening 7 Cuts or perforations 10 Opening knob

Claims (3)

[Claims] 1. A partially unsealed heat-sealing lid material in which a heat-sealable film layer having a predetermined partial opening portion in advance is laminated on one surface of a base material having no heat fusion property via a weak adhesive layer and an adhesive layer. .. 2. The heat-sealing lid material according to claim 1, wherein the base material having no heat-sealing property and the heat-sealable film layer are not separated at all, and the opening knob is integrated. 3. The heat-sealing lid member according to claim 1, wherein the heat-sealing film layer is easily broken by heat-sealing with the container flange.