JPH0642122B2 - Composite display label with peelable film laminate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to labels whose surface is provided with an indication such as printing, and more particularly to a composite display label which is peelably adhered to an adherend or the like.

(Prior Art) In a display label or a sticker, a release paper is provided on the back surface of a base material via a pressure sensitive adhesive, and the base material with the release paper peeled off is adhered to an adherend to be used for display, decoration, etc. Labels with tack made are widely known.

(Problems to be Solved by the Invention) Such a tacked label is used in various fields, but depending on the application, for example, in the case of an opening prevention seal or a speed lottery, a label once adhered may be peeled off again. In addition, in this case, it is often required to have a special function such that the label is made into a multi-layer and the lower side is left on the adherend and the other part is peeled off.

For such an application, the present inventor includes a laminated structure in which thermoplastic films are fused to each other at a specific temperature, and when the front side substrate is peeled off after adhering to an adherend, the plastic film of this laminated structure is included. We have proposed a composite display label that allows the fused material to be easily peeled between the two (Japanese Utility Model Application No. 60-66725, etc.).

In such a composite label, the thermoplastic films are fused to each other at an appropriate temperature between the melting point and the softening point to form an integrated laminated label, but the peeling force between them is large. Is much lower than the peeling force due to normal adhesion, so that when the display label is peeled off, peeling always occurs at this portion, and the lower plastic film is left in a state of being adhered to the adhered surface.

By utilizing such characteristics, such a composite display label can be applied to various fields such as a laminated sheet, a slip sheet of a printing film, and a postcard in addition to the original display label.

However, it is not easy to control the temperature during the heat processing in order to fuse the two thermoplastic resin films in a peelable manner. For example, when forming the laminated structure by the thermal extrusion method, the temperature distribution of the T die is It is necessary to have a high degree of skill or strict condition setting in order to make the temperature uniform or to control the temperature of the winding or pressure bonding roll (cooling). The present inventors have adopted an integral sandwich structure in which a polyethylene film is thermally extruded between a laminate such as polyethylene provided on the back surface of the substrate and another thermoplastic resin layer, so that the extruded polyethylene film is heated at the time of peeling. We have already proposed and put to practical use a structure that succeeds in easily separating it from the plastic resin side.

In such a sandwich structure, even if the polyethylene film is extruded at a relatively low temperature, it is firmly adhered to the same type of polyethylene laminate on the substrate side, while the material of the thermoplastic resin layer is appropriately selected, In between, easy peeling can occur. For this reason, it becomes possible to reliably control the peeling (so-called pseudo-bonding breakage) that occurs in the laminated body, and the temperature control conditions are greatly relaxed.

However, such a sandwich structure complicates the manufacturing process and requires a temperature of at least about 200 to 260 ° C even if polyethylene with a relatively low melting point is used, so uneven distribution due to temperature gradients is unavoidable to some extent. Met.

Therefore, when obtaining the composite display label of 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 Problems) The conventional problem is that an EVA composition containing 3 to 18% by weight of vinyl acetate and the balance of ethylene is about 120 to 210.
By a label for composite display having a peelable film laminate, characterized in that the opposite sides of a tubular article obtained by heating and pressing by an inflation method at a temperature of ℃ are peeled from each other and laminated integrally. Will be resolved.

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

When the vinyl acetate portion of such EVA is set to about 3 to 18% by weight and melted at a temperature of about 120 to 210 ° C. to form a film and press-bonded to each other, both films are uniformly fused and integrated as a whole and, if necessary, 180 when peeled from each other
It was found that peeling was easily performed with a peeling force of about 3 to 40 g / cm in terms of peeling resistance.

When the content of vinyl acetate exceeds 18% by weight, the film moldability of the composition becomes unstable, and it becomes difficult to stably raise the film from a ring die of an inflation molding machine. On the other hand, if it is less than 3% by weight, the substantial effect due to the addition of vinyl acetate cannot be obtained, a high molding temperature is required, and the fusion between the films becomes uncertain.

The EVA laminate can be molded by any method, but the EVA composition or copolymer melted in the cylinder is extruded from a ring-shaped die and extruded with air to stand up as a tubular body and then is pressed by a pressure roller. It is desirable to use so-called inflation molding for winding.

Inflation molding itself is usually used to produce a bag-shaped product or a sheet-shaped film obtained by cutting the bag-shaped product.
In the present invention, a film obtained as a tubular body is simply pressure-bonded by a roller or the like and the opposing tubular walls are fused to each other to obtain a two-layer laminated structure.

Here, the EVA copolymer containing 3 to 18% by weight of vinyl acetate is easily formed into a film at a temperature of 120 to 210 ° C. in the case of inflation molding, and it is 180 ° peeling resistance after being solidified by pressing them together above the cooler. About 3-40g
A laminated film having a peel strength of / cm can be easily obtained. Here, since the molten EVA copolymer is blown out from the ring-shaped die, the heating temperature is quite uniform when viewed from the width direction of the film at the time of pressure bonding, and there is no fear that the peel strength will be different depending on each part of the film.

Further, the film laminate can be made from a single raw material in a single molding step using a conventional inflation molding machine, and as in the case of the sandwich structure, the film of each layer is made of different materials such as a laminator and an extruder. The manufacturing procedure is significantly simplified as compared with the case of manufacturing in multiple steps using.

Further, the laminated body may be formed by simply crimping and integrating a tubular film with a crimping roller or the like, and a device and a procedure for guiding and aligning a plurality of film layers separately are omitted.

The composite label of the present invention can be made into various forms by combining the film laminate thus obtained with a surface substrate or release paper according to the purpose.

For example, by applying a pressure-sensitive adhesive to one side of the laminated film and sticking a release paper, an ordinary multi-layered display label can be obtained, and once adhered to an adherend and then peeled off,
The laminate is separated by the difference between the adhesive strength of the adhesive and the pseudo adhesive strength between the films of the film laminate, 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 adherend can be seen through as it is, which is effective for protecting or decorating the surface.

Further, it is also possible to add various processes such as coloring to the film on the surface side of the laminate to give various descriptions as a printing 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 can be used as it is for various purposes. For example, a thin film or paper used for an inner lid of a cosmetic product, an insulating sheet of an electronic device, a slip sheet of a printing sheet, or the like is not easy to punch and handle, but in such a case, the laminate of the present invention is used. If it is used, the thickness is at least doubled, which makes processing and handling extremely easy.

(Example) Hereinafter, the present invention will be described with reference to examples.

EVA (10% by weight vinyl acetate) = 1.0 g / 10 min EVA copolymer (Asahi Kasei Co., Ltd. product,
Product name: EF1010) Inflation molding machine caliber 40cm
It melts by heating with a screw cylinder of about 130 ℃,
A film having a thickness of 50 μm was inflation-molded into a tubular shape from a ring die.

The formed tubular product was pressure-bonded to a bag-shaped product having a width of about 14 cm above the cooling zone by a pressure roller, and the opposing tubular walls were fused together and allowed to cool.

As shown in FIG. 1, a silicone release paper 5 was attached to one side of the laminate 3 composed of the films 1 and 2 thus obtained 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 as shown in FIG. After that, when removing the label as necessary, the film 1 of the laminated body 3
The film 2 remains on the adherend side by peeling from the stripping margins provided at appropriate positions 2 and 2, and the film 1 is stripped off.

In this case, the peel strength formed by fusion-bonding between the films 1 and 2 is about 20 g / cm, which is larger than the peel strength by the adhesive 4 between the film 2 and the adherend 8. Peeling is always between films 1 and 2 because it is much smaller. The peeling strength between the films 1 and 2 of the thus-obtained display label 7 is quite uniform for each part of the series of sheets, so that partial peeling or peeling may occur in the product. There is no place.

The display label 7 was punched in a predetermined pattern as shown in FIG.
Can be completely punched out, and the removal of the dregs results in a circular pattern 10, for example as a lid for a cosmetic cream bottle. This pattern 10 is formed by applying a sheet of release paper to a label or the like later, and the lower film 2
It can be easily peeled off from and can be easily incorporated into the process of the flow operation for filling the cream bottle.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is an explanatory view showing a usage mode of the embodiment, and FIG. 3 is an explanatory view showing a usage mode of another embodiment of the present invention. . In the figure, 1,2 ... film, 3 ... laminate, 4 ... adhesive 5 ... release paper, 6 ... paint layer 7 ... display label

Claims (4)

[Claims] 1. A tubular article obtained by extruding an EVA composition containing 3 to 18% by weight of vinyl acetate and the balance of ethylene at a temperature of about 120 to 210 ° C. by an inflation method so that opposite sides of the tubular article can be separated from each other. A label for composite display, comprising a peelable film laminate, which is pressure-bonded to and laminated integrally. 2. A peelable film laminate, wherein the composite label has a release paper adhered to one side of the film laminate via a pressure sensitive adhesive. A label for composite display according to item 1 of the above. 3. The label for composite display according to claim 1, further comprising a peelable film laminate, wherein at least one side of the film laminate is printed. . 4. A label for composite display according to claim 1, further comprising a peelable film laminate, wherein a paper sheet is bonded to at least one side of the film laminate. .