Container equipped with label and production method thereof

Details Container equipped with label and production method thereof Container equipped with label and production method thereof

1989-12-06

1993-06-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428349, 428220, 428349, 428359, 428200, 428204, 428402, 156232, 156241, 156DIG5, 264516, 264509, B32B 2700, C09J 702, B65D 2308, B29C 4514

Patent

active

052233154

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND ART

1. Technical Field
The present invention relates to a labelled plastic vessel and a process for the preparation thereof. More particularly, the present invention relates to a labelled plastic vessel which has no bulge or wrinkle on the outer surface of an attached label and is excellent in the adhesion and peeling resistance of the label, and a process for preparing this labelled vessel by the in-mold labelling operation. Furthermore, the present invention relates to an adhesive label to be used for carrying out this process.
2. Description of the Prior Art
Attachment of a label indicating the content to a hollow-formed vessel is very important in the packaging technique because the attached label increases the commercial value of a packaged product and excites consumer's interest.
It has been known from old that a label is attached to a hollow-formed vessel by the in-mold labelling operation, and there is ordinarily adopted a method in which a label to be attached is held on the inner surface of a cavity of a forming mold by vacuum suction or the like and a plastic parison is subjected to hollow forming in this mold (see, for example, Japanese Patent Application Laid-Open Specification No. 202818/86).
A label composed mainly of a plastic film is preferable as the label to be attached by the in-mold labelling operation because the back surface can be printed and an image is sharp and excellent in the stain resistance. From the viewpoint of utilization of heat of the plastic vessel wall being formed, use of a heat-sensitive adhesive, especially a hot-melt adhesive, is advantageous.
However, in the case where a label composed of a plastic film is attached to a hollow-formed vessel by the in-mold labelling operation, wrinkling or bulging is caused in the label and the appearance characteristics of the label tend to degrade, and since the adhesion of the label to the outer surface of the vessel is insufficient, the label tends to peel or drop from the vessel during storage or transportation of the vessel. These tendencies are especially conspicuous in case of a composite label composed of a plastic film and a metal foil.
A heat-bondable film label of a plastic film comprising a hot-melt adhesive as the adhesive is disadvantageous in that in the in-mold labelling operation, it is often difficult to supply such labels precisely one by one and trouble with supplying a plurality of labels in the piled state to the side wall portion of a vessel is often caused. The reason is that since the smoothness of the film is high, adhesion is often caused between film labels and since the hot-melt adhesive is sensitive to heat, the stickiness is increased according to environmental conditions and the like.
An adhesive composed mainly of an ethylene/vinyl acetate copolymer, in which a tackifier is incorporated according to need, has been used as the hot-melt adhesive for labels. However, this known hot-melt adhesive is still insufficient in the heat resistance and chemical resistance. For example, in the case where hot filling is carried out for improving the preservability of the content (sterilization), deviation in a label or reduction of the bonding force tends to occur. Moreover, in case of vessels for cosmetics, toiletry goods, chemicals and the like, troubles such as peeling of labels and reduction of the bonding force are readily caused by the action of the content adhering to the outer surface of the vessel at the filling step. Gist of the Invention.
It is therefore a primary object of the present invention to prevent occurrence of wrinkling or bulging in a label in preparing a labelled plastic hollow-formed vessel by the in-mold labelling operation and improve the adhesion of the label to the outer surface of the vessel and the peeling resistance of the label.
Another object of the present invention is to provide a process in which the above-mentioned problems caused in preparing a labelled plastic vessel by the in-mold labelling operation are solved, it is possible to supply heat-bondable film label

REFERENCES:
patent: 4037020 (1977-07-01), Ishii et al.
patent: 4359165 (1982-11-01), Jakobsen
patent: 4601926 (1986-07-01), Jabarin et al.
patent: 4837075 (1989-06-01), Dudley

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