JPH07187169A - Paper cup - Google Patents

Abstract

PURPOSE:To prevent the paper layer of a paper cup from breaking when the heat-sealed cover is peeled off and obtain an easily unsealing characteristic without loss of the sealing strength. CONSTITUTION:A plastic layer 5 with strength is laminated between a thermoplastic resin layer (polyethylene layer 6) at the contact side with a cover material 8 and a paper layer 3. The cover material 8 having an easy-peel-sealant 11 at the innermost layer is hermetically sealed with heat. When the cover is peeled off, the part between the thermoplastic resin layer (polyethylene layer 6) getting into contact with the cover material 8 and the innermost layer of the cover material 8 or the inside of the innermost layer of the cover material 8 is broken and the paper layer 3 of the paper cup 1 side is opened without breakage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of heat-sealing a lid material and easily opening the lid material for storing a liquid such as a beverage or a semi-solid such as yogurt. It relates to the paper cup used.

[0002]

2. Description of the Related Art Conventionally, a paper cup containing yogurt or the like has been formed of polyethylene-coated paper on both sides. After filling the contents, a curling flange formed in the opening is covered with a lid material. Heat sealed and sealed. Then, when opening, the lid member is peeled off from the flange portion.

[0003]

When a lid member made of, for example, aluminum foil, polyethylene and a hot melt agent is heat-sealed to the paper cup having the above structure, the lid member is firmly adhered to the polyethylene layer of the paper cup. The situation occurs that it is difficult to open. Also, when the lid material is peeled off, the thermoplastic resin as the adhesive surface with the paper cup is cut off,
There is a problem in that the paper layer is unsealed in a state in which the layers are broken, and the broken surface is exposed, so that the appearance is not good.
If the heat sealing temperature is lowered or the sealing time is shortened in order to avoid this, on the contrary, the sealing strength tends to be insufficient, and leakage of contents from the interface between the lid and the paper cup tends to occur. I will end up.

The present invention has been made in view of the above problems, and an object thereof is to prevent the paper layer of the container from being destroyed when the heat-sealed lid member is peeled off, and to seal the container. It is intended to provide a paper cup which can be easily opened without impairing the strength.

[0005]

In order to achieve the above object, the paper cup of the present invention comprises a processed paper in which a thermoplastic resin layer is laminated on both sides of a paper layer, and a curling flange is provided with a lid material. In a paper cup used in a heat-sealed form, a strong resin layer is laminated between the paper layer and the thermoplastic resin layer on the side in contact with the lid member.

As the thermoplastic resin layer, polyethylene (PE), polyester (PET), ethylene-vinyl acetate alcohol copolymer (EVOH) and the like are used. Further, as the resin forming the resin layer having the above strength, polyester (PET), stretched polypropylene (O
A film having heat resistance higher than that of the thermoplastic resin on the side in contact with the lid material, such as PP) or high density polyethylene (HDPE), or a laminated film thereof is used.

[0007]

In the paper cup of the present invention having the above-mentioned structure, the lid member having the easy peel sealant in the innermost layer is heat-sealed and hermetically sealed. And when the lid material is peeled off,
The destruction is performed at the interface between the thermoplastic resin layer in contact with the lid material and the innermost layer of the lid material or in the innermost layer of the lid material.

[0008]

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

In FIG. 1, reference numeral 1 denotes a paper cup having a flange portion 2 formed in a curl shape toward the outside. As a processed paper constituting the paper cup 1, a polyethylene layer 4 is provided on the inner surface side of a paper layer 3. A resin layer 5 having high strength and heat resistance and a polyethylene layer 6 are laminated in this order, and a polyethylene layer 7 is laminated on the outer surface side with an appropriate printed pattern interposed therebetween. In this embodiment, a biaxially stretched polyester film is used as the resin layer 5 having strength and heat resistance, and the polyethylene layers 4, 6 and 7 are laminated by extrusion laminating (EC processing).

Reference numeral 8 denotes a lid material, which is a polyester layer 9
A polyethylene layer 10 and an easy peel sealant 11 are laminated on the back surface of the lid, and the lid member 8 is completely adhered to the flange portion 2 of the paper cup 1 by heat sealing.

In the cup container sealed as described above, the innermost polyethylene layer 6 in the paper cup 1 is in strong adhesion with the biaxially stretched polyester film (resin layer 5) in contact therewith, and the flange portion Since 2 is strong, when the lid member 8 is peeled off from the paper cup 1, the interface between the innermost polyethylene layer 6 of the paper cup 1 and the easy peel sealant 11 of the lid member 8 or the easy peel sealant 11 is removed as shown in FIG. Breakage occurs in the layer and it is opened.

In the above embodiments, the paper cup having the outwardly curled flange portion has been described as an example. However, the paper cup of the present invention has an inwardly curled flange portion. You may have.
In this case, as the processed paper that constitutes the paper cup 1,
On the outer surface side of the paper layer 3, a polyethylene layer 4, a resin layer 5 having strength and heat resistance, and a polyethylene layer 6 sandwiching an appropriate printing layer.
And a polyethylene layer 7 is laminated on the inner surface side.

[0013]

As described above, since the paper cup of the present invention is constituted by laminating a strong resin layer between the thermoplastic resin layer and the paper layer on the side where the lid material contacts, the innermost layer. When the lid material with the easy peel sealant is heat-sealed and sealed, and when this lid material is peeled off and opened, the space between the thermoplastic resin layer in contact with the lid material and the innermost layer of the lid material or the lid material Since the destruction occurs in the inner layer, the paper layer on the paper cup side is not destroyed. Moreover, the sealing strength is not impaired and the easy-opening property can be obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a paper cup with a lid member heat-sealed.

FIG. 2 is a partial cross-sectional view showing the paper cup with a lid member removed.

[Explanation of symbols]

 1 Paper cup 2 Flange part 3 Paper layer 4 Polyethylene layer 5 Strong resin layer 6 Polyethylene layer 7 Polyethylene layer 8 Lid material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Kaji 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd.

Claims (1)

[Claims] 1. A paper cup, which is made of processed paper in which a thermoplastic resin layer is laminated on both sides of a paper layer and has a curling flange portion heat-sealed with a lid member, has a heat on the side where the lid member contacts. A paper cup having a strong resin layer laminated between a plastic resin layer and a paper layer.