JPS63115191A - Label for compound display with peelable film laminate - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to labels whose surfaces are marked with printing or the like, and particularly to composite display labels that are removably adhered to adhered objects.

(Prior art) In display labels, stickers, etc., aS paper is provided on the back side of the base material via a pressure-sensitive adhesive, and the base material from which the 2IIm paper is peeled off is adhered to the adherend and used for display, packaging, etc. Tacked labels made in this manner are widely known.

(Problems to be Solved by the Invention) Such tack-attached labels are used in various fields, but depending on the application, they may be used as tamper-proof seals, or as in the case of Speed, where the label is once attached and then peeled off again. In this case, a special function is often required, such as making the label multi-layered so that the lower layer remains on the adherend and the other parts are peeled off.

For such applications, the present inventor has developed a laminated structure in which thermoplastic plastic films are fused together at a specific temperature, and when the front base material is peeled off after adhering to the adherend, the plastic film of this laminated structure is A composite display label has been proposed in which the fused material can be easily peeled off between the two (Utility Model Application No. 8F1725, 1983, etc.).

In such a composite display label, the thermoplastic plastic films are fused to each other at an appropriate temperature between their melting point and softening point to form an integrated laminated label, but the peeling force between them is Since the peeling force is much lower than that of ordinary adhesives, when the display label is removed, peeling always occurs at this part, leaving the underlying plastic film stuck to the surface to which it is adhered.

Utilizing such characteristics, such a composite display label can be applied to various fields other than the original display label, such as laminated slips, interleaf sheets for printing films, and even postcards.

However, in order to releasably fuse two thermoplastic resin films, it is difficult to control the temperature during thermal processing. A high degree of skill or strict condition setting is required to make the temperature uniform or to adjust the temperature (cooling) of the winding or pressure roll. The extruded polyethylene film is created by using an integral sandwich structure in which the polyethylene film is heat extruded between the plastic resin layer! We have already proposed and put into practical use a structure that has succeeded in easily separating it from the thermoplastic resin side at the time of A-female.

In such a sandwich structure, the polyethylene film firmly adheres to the same type of polyethylene laminate on the base material side even when extruded at a relatively low temperature, and on the other hand, by appropriately selecting the material of the thermoplastic resin layer, Easy peeling can occur between the two. For this reason, it has become possible to reliably control ';A separation (so-called failure of pseudo-adhesion) occurring in the laminate, and the conditions for temperature control have been significantly relaxed.

However, with such a sandwich structure, the manufacturing process is complicated, and even if polyethylene with a relatively low melting point is used, the temperature must be at least 200 to 280 degrees Celsius, so there is some degree of uneven distribution due to temperature gradients. It was inevitable.

Therefore, when obtaining a composite display label with the above configuration,
It has been desired to develop a means by which a laminated structure having a peelable pseudo-adhesive surface can be obtained more easily.

(Means for Solving the Problems) The problem with the prior art is that the EVA composition containing 3 to 18% by weight of vinyl acetate and the balance ethylene is
The film obtained by heating and melting at a temperature of ℃ is peeled off to phase R.
The present invention is solved by a composite display label with a peelable film laminate, which is characterized in that it is crimped to a τ1r capacity and laminated together.

So-called EVA compositions or copolymers of ethylene and vinyl acetate soften or melt at considerably lower temperatures than polyethylene and are better compatible with one another.

The vinyl acetate portion of such EVA is approximately 3 to 18 weights 1
%, when melted at a temperature of about 120 to 210"C, formed into films, and pressed together, both films will be uniformly fused and integrated throughout, and if necessary, when peeled from each other, they will have a peel resistance of 180 degrees. Converted to about 3-40g/c
It was found that the film could be easily released with a peeling force of m.

If the vinyl acetate content exceeds 18% by weight, the moldability of the film 1 of the composition becomes unstable, making it difficult to stably stand up the film from the ring tie of an inflation molding machine, for example. If the amount is less than 3% by weight, the addition of vinyl acetate will not have any substantial effect, necessitating a high molding temperature and making the fusion between the films unreliable.

The EVA laminate can be formed by any method, but the EVA composition or copolymer melted in a cylinder is extruded through a ring-shaped mouthpiece, raised as a cylindrical body while blowing air, and then a pressure roller is used to form the EVA laminate. It is desirable to use what is called inflation molding.

Inflation molding itself is usually used to manufacture bag-like products or sheet-like films made by cutting them.
In the present invention, a two-layer laminated structure is obtained by simply pressing the film obtained as a cylindrical body with a roller or the like and fusing the opposing cylindrical walls to each other.

In this case, EVA copolymer containing 3 to 18% by weight of vinyl acetate easily forms a film at a temperature of 120 to 210°C in the case of inflation molding, and by pressing these together on the L side of a cooler, it has a peel resistance of 1800 after solidification. A laminated film having a peel strength of about 3 to 40 g/cm can be easily obtained. Here, since the molten EVA copolymer is blown out from a ring-shaped goo, the heating temperature is completely uniform when viewed from the width direction of the film 11 at the time of pressure bonding, and there is no possibility that the peel strength differs depending on each part of the film.

Furthermore, film laminates can be made from raw materials in a molding process using conventional inflation molding machines, or, as in the case of the sandwich structure, each layer of film is made from a separate material using a laminator, extrusion process, etc. The manufacturing procedure is significantly simpler than when manufacturing using !1 etc. in multiple steps. .

In addition, the laminate can be produced by simply pressing and integrating a cylindrical film along its width with a pressing roller or the like, and the apparatus and procedures for guiding and aligning the plurality of film layers separately are omitted.

In the composite label of the present invention, the surface of the film laminate thus obtained is coated with Omura or 'A' depending on the purpose.
Various forms can be obtained by combining 11 papers.

For example, apply a pressure sensitive adhesive to one side of the laminated film and 21! If a release paper is applied, a normal multi-layer display label can be obtained; once it is adhered to a young object and then peeled off, the adhesive strength of the adhesive and between the films of the film laminate will be reduced. The laminate is separated due to the difference in the pseudo adhesive strength, one film is left on the adherend side and the other film is peeled off.

In this case, since the EVA film is usually transparent, the surface of the object to be adhered to can be seen through, and it is effective for protecting or decorating the surface.

Furthermore, it is also possible to add a coloring process to the film on the surface side of the laminate to provide various descriptions as a printed surface,
If necessary, aluminum vapor deposition or a paper sheet may be further attached.

In addition to being used as a tack label, this laminate itself can be used for various purposes. For example, five-sided films and papers are used for the inner lids of cosmetic products, insulating sheets for electronic devices, and interleaf sheets for printing sheets, but it is not easy to cut out or handle them. If a body is used, the thickness is at least doubled, making processing and handling extremely easy.

(Example) The present invention will be explained below with reference to Examples.

MI (melt index) containing 10 F 5% vinyl acetate = 1. EVA of og/10m1n:l
:! Polymer (Asahi Kasei product, product name: EFIOIO)
was heated and melted at a temperature of about 130° C. in a screw cylinder with a diameter of 40 cm in an inflation molding machine, and then inflation molded into a cylindrical film with a thickness of 50 gm from a ring die.

The molded cylindrical article was pressed onto a bag-like article having a width of about 14 cm using a pressure roller in the L side of the cooling zone, and the opposing cylindrical walls were welded together and allowed to cool.

As shown in FIG. 1, silicone 2119 paper 5 was adhered to one side of the thus obtained laminate 3 consisting of films 1 and 2 via a pressure-sensitive adhesive 4. On the other hand, a white paint layer 6 was provided on the surface of the upper film 1, and appropriate printing was performed to form a display label 7.

The display label 7 is adhered to an adherend 8 with an adhesive 4, for example, as shown in FIG. After that, when removing the label as necessary, remove the film 1 of the laminate 3.
By peeling off from the peeling margin 8 provided at an appropriate position of 2, the film 2 remains on the adherend side and the film 1 is peeled off.

In this case, the peel strength formed between the films 1 and 2 by fusion bonding is approximately 201/am, which is compared to the peel strength due to the adhesive 4 between the film 2 and the adherend 8. Because it is much smaller, peeling is always done with the film l.
and 2. The peel strength between the films 1 and 2 of the display label 7 obtained in this way is completely uniform for each part of the series of sheets, and some products may have partial peeling or difficulty in peeling. There are no such places.

When the display label 7 was punched in a predetermined pattern as shown in FIG.
can be completely punched out, and by removing the punching dregs, a circular pattern 10, which can be used as the inner lid of a cosmetic cream bottle, for example, is obtained. This pattern 10 can then be easily separated 211 from the underlying film 2 by labeling or the like with a sheet of release paper and can be easily incorporated into the assembly line for filling cream bottles.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing how the embodiment is used, and FIG. 3 is an explanatory diagram showing how another embodiment of the invention is used. . In the figure, 1.2...Film, 3...
...Laminated body, 4...Adhesive 5
...... Release paper, 6... Paint layer 7... Display label patent applicant Sayama Kako Co., Ltd. (and 1 other person)

Claims (5)

[Claims] (1) Films obtained by heating and melting an EVA composition containing 3 to 18% by weight of vinyl acetate and the remainder of ethylene at a temperature of about 120 to 210°C are peelably bonded to each other,
A composite display label comprising a peelable film laminate characterized in that it is integrally laminated. (2) The EVA composition according to claim 1, which is obtained by heat-molding the EVA composition into a bag shape by an inflation method at a temperature of about 120 to 210° C., and fusing and integrating opposing sides of the bag shape with each other. Composite display label with peelable film laminate. (3) The composite label comprises a peelable film laminate, characterized in that the composite label has a release paper adhered to either side of the film laminate via a pressure-sensitive adhesive. Composite display label as described in Range 1. (4) The composite display label according to claim 1, comprising a peelable film laminate, wherein at least one side of the film laminate is subjected to a printing process. (5) The composite display label according to claim 1, comprising a peelable film laminate, characterized in that a paper sheet is bonded to at least one side of the film laminate.