JP2560527B2 - Labeled container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a labeled container in which a label is integrated on the surface simultaneously with biaxial stretch molding.

(Prior Art) A labeled container in which a label having a pattern or the like is attached to the surface of a conventionally molded plastic container is generally used in the market.

Since the label is later attached to the thus-formed container, the number of working steps is increased, and the label is in a state of protruding on the container surface.

As an alternative to this, a container in which a label is integrally provided at the same time as the molding of the container is used.

This container had a structure in which the surface of the label was at the same height as the surface of another container, and the label became a part of the container.

Further, as a method for molding the container, there are a direct blow for stretching the parison only in the lateral direction and a biaxial stretching method for stretching the preform in the longitudinal and lateral directions.

In the biaxial stretch molding method, a large number of plastic bottles (hereinafter referred to as stretched PET bottles) using a polyethylene terephthalate resin as a container for drinking water, edible oil or the like have recently been adopted as a synthetic resin material.

Labels are also integrated into this stretched PET bottle at the same time as molding, but the label uses paper or synthetic paper as the base material, and both are opaque. A transparent label is desired.

Transparent labels include those obtained by coating an adhesive varnish on a transparent film such as stretched or unstretched polypropylene resin or polyethylene terephthalate resin [], and those obtained by adhering an ethylene vinyl acetate copolymer film to the transparent film []. .

(Problems to be solved by the present invention) In the above label, due to the heat at the time of molding, the residual solvent in the adhesive varnish is vaporized, it does not pass out of the label, there is a problem that the appearance remains as bubbles and impair the appearance. In the above label, the ethylene-vinyl acetate copolymer film can be integrated with the container without using an adhesive, but there is a problem that a perfect transparency cannot be obtained due to the characteristics of the resin. It was

(Means for Solving the Problems) The present invention is to solve the above problems, and at least in a labeled container in which a label is integrated on the container surface by biaxially stretching the container with a polyethylene terephthalate resin, A polyester resin having a heat fusion temperature lower than the container molding temperature of 80 ° C to 100 ° C, the label having excellent transparency, on the container surface made of polyethylene terephthalate resin, by biaxial stretch molding and heat fusion at the same time, It is intended to provide a labeled container characterized by being integrated so as not to cause a step.

(Function) Since the labeled container of the present invention uses a film having a heat fusion temperature lower than the container molding die temperature as an adhesive base material for the label, it can be molded under the conventional molding conditions and has excellent transparency. An attached container was obtained.

(Example) Hereinafter, the labeled container according to the present invention will be described in detail with reference to specific examples.

The labeled container of the present invention is a so-called in-mold label in which the label is heat-sealed at the same time as the molding of the plastic container, and labeling is applied to a plastic bottle called a biaxially stretched PET bottle using a polyethylene terephthalate resin. It is a labeled bottle.

First, the label (1) is characterized in that a heat-fusible film (3) made of polyethylene terephthalate resin is laminated inside a protective film (2) having excellent transparency as shown in FIG. .

Here, as the protective film (2) having excellent transparency,
A film made of a thermoplastic resin such as polypropylene, polyethylene terephthalate, polyamide or polyethylene can be used.

Here, a heat-fusible film (3) made of ink is provided inside the film (2).

The heat-fusible film (3) is a polyester resin whose acid component is usually terephthalic acid and glycol component is ethylene glycol, and other acid components are isophthalic acid and diphenyl ether 4,4. ′ -Dicarboxylic acid, naphthalene 1,4 or 2,6 dicarboxylic acid, adipic acid, sebacic acid, decane 1, -10 dicarboxylic acid, hexahydroterephthalic acid, azelaic acid, dimer acid, glutaric acid and other glycol components , Propylene glycol, 1,4-butanediol, neopentyl glycol, diethylene glycol, cyclohexanedimethanol, 2,2-bis (4-hydroxyethoxyphenyl) propane, or P-oxybenzoic acid and P-oxyethoxybenzoic acid as oxyacids Resins containing acids, etc. can be used. It may be a blend of stell resin.

When the protective film (2) and the heat-fusible film (3) were pasted together with a polyester or polyurethane adhesive, a label with excellent transparency was possible.

A print layer (4) is usually formed on the inner surface of the protective film as shown in FIG. 1, and the film and the heat-fusible film (3) are bonded together.

The label (1) is punched out into a desired shape, locked in a mold for biaxially stretch molding, and a polyethylene terephthalate preform is biaxially stretch molded to obtain a biaxially stretched hollow container.

Here, the mold temperature at the time of molding is set to 80 to 100 ° C at which the heat-sealing film (3) can be fused to the container, and the temperature of the preform is set to about 110 ° C.

(Effects) The present invention has the above-described structure, is excellent in aesthetics when used in a plastic container having excellent transparency as a label, and is also excellent in aesthetics when an adhesive varnish is not used. The use of the polyester resin film as in the present invention is superior in transparency as compared with the conventional heat-adhesive ethylene vinyl acetate copolymer film which does not generate bubbles between the container and the label.

Furthermore, since it is excellent in low-temperature fusion property, it is also excellent in practicality that it does not affect the plastic container molding conditions.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of a label used for the labeled container of the present invention. (1) …… Label, (2) …… Protective film, (3)…
… Thermal fusion film, (4) …… Printing layer

Claims (1)

(57) [Claims] 1. A labeled container in which a container is biaxially stretched with a polyethylene terephthalate resin and at the same time a label is integrated on the surface of the container, and a polyester having a heat fusion temperature lower than the container forming temperature of at least 80 ° C. to 100 ° C. A labeled container characterized in that the label, which is a resin and has excellent transparency, is integrally formed on the container surface made of polyethylene terephthalate resin by biaxial stretch molding and at the same time by thermal fusion so as not to cause a step. .