JP2002193329A - Easy-to-peel lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-peel lid for a cup of instant noodles or yogurt and a tray of a medical product which is easy to open like a conventional one wherein there is no stringing nor paper peeled when opening the lid of a cup container 30, there is no peel of the lid 20 occurring during transportation and storage in the summer time, and the lid is excellent in an appearance when peeled and heat deterioration resistance. SOLUTION: The easy-to-peel lid comprises a base material layer 4, a barrier layer 5 and an easy-to-peel layer 6 which are appropriately laminated, wherein the easy-to-peel layer 6 comprises a blended resin of a low density polyethylene and polybutene-1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention provides easy opening of lids for cup ramen, cup yogurt, tray hygiene products and the like as before, and has excellent appearance upon peeling and excellent heat deterioration resistance. Related to easy peel lid material.

[0002]

2. Description of the Related Art FIG. 1A shows a conventional example of a cup noodle for pouring cooked hot water, a cup yogurt cooled in a refrigerator, and a tray sanitary medical product containing wet sterilized cotton. As shown, a base material layer 4 of a beautifully printed paper material or polyester, etc. on the surface,
Such as aluminum foil, polyester on which inorganic oxides such as aluminum, silicon oxide, and aluminum oxide are deposited,
A barrier layer 5 having an excellent gas barrier property, such as an ethylene-methacrylic acid copolymer (EMAA), an ethylene-vinyl acetate copolymer (EVA), or a normal hot melt adhesive;
Easy peel layer 6 that can be peeled off after thermal fusion
2 is appropriately laminated with an adhesive layer (not shown) or the like, and the periphery is appropriately cut with a punching blade or the like. For example, an easy peel lid material with a knob 21 shown in FIG. As shown in (1), it is generally used widely by covering a cup container 30 made of a base paper with a polyethylene coat on the inner surface side and heat-sealing a peripheral portion to a flange 31 of the cup container 30.

[0003]

The peripheral portion of the conventional heat-sealing portion is formed on the flange 31 of the cup container 30 by appropriately laminating the above-described base material layer 4, barrier layer 5 and easy peel layer 6, respectively. 2 with the easy peel lid material shown in FIG. 2, the cup container 30 can be easily opened simply by putting a finger on the knob 21 of the lid material 20 and pulling slightly. Easy peel lid material.

However, the conventional easy peel layer 6 is
Ethylene-methacrylic acid copolymer (EMAA)
As for the easy peel cover made of a resin copolymer such as a vinyl acetate copolymer (EVA), when the cup container 30 is opened, a stable peeling feeling of the cover 20 is obtained, but the resin at the time of copolymerization is obtained. The problem is that stringing or paper peeling occurs due to the non-uniform components of the ink, and the appearance of the heat-sealed portion at the time of peeling is impaired. In order to prevent such stringing or paper peeling, As for the easy-peel lid material in which the easy-peel layer 6 is made of a resin copolymer containing an appropriate elastomer, the heat-deterioration resistance described later is a problem.

In the case of the conventional easy-peel lid material in which the easy-peel layer 6 is made of a normal hot-melt adhesive or the like, when the cup container 30 is opened, a stable peeling feeling of the lid material 20 is similarly observed. Although it is obtained, it is a problem that the lid 20 is peeled off due to the heat deterioration of the hot melt during transportation or storage in summer, and also due to the adhesiveness of the hot melt. There is also a problem with poor laminating workability such as inability to apply at a high speed during lamination.

[0006] The object of the present invention is to provide cup ramen, cup yogurt, tray hygiene medical products and the like.
The lid can be easily opened as in the past, and no stringing or peeling occurs when the cup container 30 is opened, and the lid 20 peels off during transportation or storage in summer. An object of the present invention is to provide an easy peel lid material which is excellent in appearance when peeled and heat deterioration resistance.

[0007]

As shown in FIG. 1A, an easy-peel lid according to the present invention comprises a base material layer 4, a barrier layer 5, and an easy-peel layer 6, which are appropriately laminated. In the material, the easy peel layer 6
An easy peel lid material comprising a blend resin of low-density polyethylene and polybutene-1.

[0008] In the easy peel lid material of the present invention,
Since the easy peel layer 6 is made of a blended resin of low density polyethylene and polybutene-1, the particle size of polybutene-1 is small and it is difficult to cause unevenness in blending with low density polyethylene. The peel strength is controlled by the blend amount of
In order to prevent the adhesive strength from being excessively high with 0, when the cup container 30 is opened, threading or paper peeling does not occur, and furthermore, it is necessary to prevent threading or paper peeling. Because there is no need to compound an elastomer,
It is possible to provide an easy-peel lid material in which the lid material 20 does not peel off during transportation or storage in summer and has excellent appearance at the time of peeling and excellent heat deterioration resistance.

By the way, for low-density polyethylene,
The blending amount of polybutene-1 is preferably 5 to 20% by weight such that an adhesive strength suitable for various constituent materials of the cup container 30, such as styrene foam, paper + polyethylene, and polypropylene, is obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The base material layer 4 and the barrier layer 5 in the easy peel cover material of the present invention are the same as those of the above-mentioned conventional easy peel cover material, and have a beautifully printed paper on the surface. The base material layer 4 having excellent strength, such as a material or polyester, and a barrier property against water vapor, oxygen, ultraviolet rays, and the like, such as aluminum foil and polyester on which inorganic oxides such as aluminum, silicon oxide, and aluminum oxide are deposited. The excellent barrier layer 5 can be appropriately laminated and used without any particular limitation.

The easy peel layer 6 in the easy peel lid material of the present invention has such a low density that the adhesive strength suitable for the above-mentioned various constituent materials of the cup container 30 to be covered and heat-sealed can be obtained. 95 of polyethylene
5 to 20 parts by weight of polybutene to -80 parts by weight
Using a blended resin of low-density polyethylene and polybutene-1 blended with No. 1 and laminating by a dry lamination method using an adhesive or an extrusion lamination method using low-density polyethylene without any particular restrictions. be able to.

[0012]

FIG. 1A is a sectional view of an easy-peel lid according to an embodiment of the present invention, and FIG. 1B is a plan view of the easy-peel lid. FIG. 2 is an explanatory cross-sectional view showing a state in which the easy-peel lid material is placed on the cup container 30 and thermally fused in the embodiment of the present invention.

That is, as shown in FIG. 1A, 50 to 80 g of beautiful printed on the surface and corona-treated on the lower surface.
/ M2 single-sided art paper base material layer 4 and lower surface 3
g / m2 of an imine-based one-component curable adhesive,
A low-density barrier layer (not shown) comprising a barrier layer 5 of an aluminum foil having a thickness of 20 μm and an easy-peel layer 6 of a 20 μm film-like blend of 86 parts by weight of low-density polyethylene and 14 parts by weight of polybutene-1. 13 to 15 at about 330 ° C. between each layer using polyethylene.
Extrude with a thickness of μm, after lamination by sand lamination method, cut the periphery in a punching process using a punching blade,
An easy peel lid material having a knob 21 and a diameter of 100 mm as shown in FIG. 1B was produced.

Then, as shown in FIG. 2, the easy peel lid material shown in FIG. 1B is made of 310 g / m 2 cup base paper coated with 15 μm polyethylene on the inner surface side, and cooked by pouring boiling water into instant noodles. 175 ° C around the flange 31 of the cup container 30
When heat fusion is performed, the cup container 30 can be easily opened with a stable peeling feeling of the lid member 20 simply by putting a finger on the knob 21 of the lid member 20 and pulling it strongly. Similarly, an easy-peel lid material that can be easily opened was obtained.

In the easy peel cover material of this embodiment, a low-density polyethylene film of 20 μm is used.
By laminating a blend resin of 6 parts by weight and 14 parts by weight of polybutene-1 as an easy peel layer 6, the particle size of polybutene-1 is small, and it is difficult to cause blending unevenness with low-density polyethylene. In addition, the amount of polybutene-1 was properly adjusted so that the adhesive strength with the cup container 30 was not excessively increased.
When the lid is opened, stringing or peeling of paper does not occur, and since there is no need to incorporate an elastomer, the lid material 20 does not peel off during transportation or storage in summer, etc. It was possible to obtain an easy-peel lid material having excellent appearance and heat resistance deterioration.

Moreover, in the easy peel cover material of this embodiment, the above-mentioned single-sided art paper, aluminum foil, film-like low-density polyethylene, and polybutene
Easy peel lid material that can be laminated efficiently and more efficiently than before using the blended resin with No. 1 by the extrusion lamination method using low-density polyethylene. Could be obtained.

[0017]

As described above, the easy peel lid material of the present invention can be easily opened for cup ramen, cup yogurt, tray hygiene products, and the like as in the prior art. When the cup container 30 is opened, no threading or peeling of paper occurs, and during transport or storage in summer, the peeling of the lid 20 does not occur. Can provide an excellent easy peel lid material.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an easy-peel lid material, and FIG. 1B is a plan view of the easy-peel lid material according to an embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a state in which an easy-peel lid material is placed on a cup container 30 and thermally fused in the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Base material layer 5 ... Barrier layer 6 ... Easy peel layer 20 ... Lid material 21 ... Knob 30 ... Cup container 31 ... Flange

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) DG10 EH23 GB18 JD01B JK20 JL02

Claims (1)

[Claims] An easy-peel lid material obtained by appropriately laminating a base material layer, a barrier layer, and an easy-peel layer, wherein the easy-peel layer is a blend resin of low-density polyethylene and polybutene-1. Easy peel lid material characterized by comprising.