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Label for battery casing

A battery shell and label technology, which is applied in the direction of battery box/outer, battery pack parts, battery box/cover materials, etc., can solve the problems of deterioration, strength reduction, difficult labeling cost, etc., and achieve excellent adhesion resistance and low cost The effect of manufacture

Inactive Publication Date: 2008-07-30
FUJI SEAL INTERNATIONAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned current heat-sensitive labels for battery cases require an extrusion lamination step in addition to the printing step, and it is difficult to reduce the cost of the label.
In addition, it is known that delayed adhesion type thermal labels can be formed by the same process as the printing process, but in order to activate them at low temperatures, they often contain substances suspected of being environmental hormones, and there are Transparency, but it delays the crystallization of the adhesive after a few days of sticking, and the label becomes cloudy and its strength decreases over time. It is not suitable for use as a casing material for dry batteries.

Method used

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Examples

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Effect test

Embodiment 1

[0059]As the heat-shrinkable film, a heat-shrinkable polyester film (thickness: 50 μm; temperature for starting heat shrinkage: 90° C.) was used. The thermal shrinkage rate in the longitudinal direction (MD direction) of this heat-shrinkable film is 17% under the condition of immersing in a glycerin bath at 110°C for 5 seconds, and 35% under the condition of immersing in a glycerin bath at 140°C for 5 seconds. %, 1.4% under the condition of immersing in a 90°C glycerin bath for 5 seconds. In addition, the heat shrinkage rate in the transverse direction (TD direction) was 2% under the conditions of immersion in a glycerin bath at 110° C. for 5 seconds. After forming a printing layer (thickness 2 μm) by gravure printing various display patterns on one side of the above-mentioned heat-shrinkable film, 88% by weight of ethylene-vinyl acetate copolymer (EVA; Content 72% by weight, melting point 62 ℃, MFR400g / 10 minutes) and 12% by weight of tackifier (terpene resin (trade name "YS...

Embodiment 2

[0061] Except using the EVA (melting point 63 ℃, MFR280g / 10 minutes) 80% by weight of EVA (melting point 63 ℃, MFR280g / 10 minutes) by ethylene content 72% by weight and the same tackifier 20% by weight of embodiment 1 The emulsion type heat-sensitive adhesive (activated temperature about 65° C.) except that the emulsion type heat-sensitive adhesive was used, the same operation as in Example 1 was carried out to produce a label.

Embodiment 3

[0063] In addition to using an emulsion type heat-sensitive adhesive (activation temperature of about 65° C.) prepared from the same EVA80% by weight and tackifier 20% by weight as the emulsion type heat-sensitive adhesive in Example 1, and The same operation as in Example 1 is used to make a label.

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Abstract

The battery casing label (1) of the present invention includes a heat shrinkable film (2) and a printing layer (3) and an adhesive layer (4) laminated on the heat shrinkable film (2). Layer (4) is made of the following emulsion-type heat-sensitive adhesive, which contains an ethylene-based copolymer with an ethylene content of 66-84% by weight and a melting point of 60-90°C and 10-30% by weight of tackifier. The above-mentioned heat-shrinkable film (2) is preferably a film having a heat shrinkage rate of 10% or more in the main stretching direction when immersed in a glycerin bath at 100° C. for 5 seconds. When the label (1) for battery cases of the present invention is used, it is excellent in low-temperature adhesiveness and blocking resistance, and does not deteriorate over time.

Description

technical field [0001] The present invention relates to a label for a battery case attached as a case material for batteries such as alkaline dry batteries. Background technique [0002] Adhesive labels are often used as casing materials for dry batteries, but in order to protect the adhesive layer when attached to the battery in this label, a release paper must be used. The number of labels per roll that can be set on the labeling machine (ラベラ-one) is limited, so the operation efficiency is reduced, and there is a problem that it becomes industrial waste after use. Therefore, a thermosensitive label coated with a thermosensitive adhesive resin by extrusion lamination (melt extrusion coating) has been proposed as a case material for a dry battery that does not require a release paper as described above (see, for example, Japanese Patent No. 3273115). [0003] However, it is difficult to reduce the cost of the label in the above-mentioned conventional heat-sensitive label fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F3/04G09F3/10C09J7/02C09J123/08H01M2/02C09J7/29
CPCC08L23/0853C09J2203/334C09J2423/00G09F3/10C09J7/35C09J7/22C09J7/29Y10T428/24843C09J2301/162Y02E60/10H01M50/124C08L2666/02
Inventor 梅田贵子鹿仓善和金光广树
Owner FUJI SEAL INTERNATIONAL INC
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