JPH0516197Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a double-sided adhesive sheet used in the production of display labels. To provide a double-sided pressure-sensitive adhesive sheet used when producing a composite display label capable of carrying out different displays.

[Conventional technology and its issues]

Demands for display labels have shown a tendency to diversify in recent years, and in particular, composite display labels that can display a variety of different displays by separating a single label sheet with an intermediate layer have been developed. The demands are increasing.

In response to these demands, conventionally a display label that has been printed with a display label has a release layer on the display surface, and a display label is further provided on the release surface with an adhesive layer interposed therebetween to create a composite display label, or 2. There are composite display labels in which an adhesive layer is provided on both outer surfaces of a laminate in which transparent plastic films of various types are melted and fixed with a thermoplastic resin such as polyethylene for pseudo-adhesion.

In the case of the former configuration, multiple indications can be made by peeling and separating the entire surface or a specific mark part that has been cut out as necessary in the case of an outer layer display label. Since display labels are coated with adhesive, they must always be affixed to a mount or to an article, making it impossible to store the display labels alone. On the other hand, with the latter configuration, the display label can be peeled off and separated like the former, and it is also possible to store the display label alone.
It was impossible to attach the peeled and separated display label to another mount or article as necessary.

If multiple display labels used for different types of display can be easily and reliably separated, the separated display labels can be stored as long as they are, and if necessary, they can be attached to articles using heat or water, so that they appear as a single product in appearance. Although it is suitable as a composite display label that carries out various different displays, such a display label that is suitable for practical use has not been known until now.

[Means to solve the problem]

Therefore, the inventor of the present invention has developed a new product that overcomes the drawbacks of the conventional products, and the gist of the product is to ensure that display labels for various different display purposes do not fall off or become misaligned with each other at all times. It is effective for creating composite display labels that are bonded and laminated together, and can be easily peeled off and separated as necessary, and the separated display labels can be easily attached to other products as necessary. As a result of research on double-sided adhesive sheets, we found that they consist of a release liner that is attached via an adhesive to both sides of a laminate made by melt-extruding and laminating a thermoplastic resin on one side of a transparent plastic film. The present invention was arrived at after confirming that it could be obtained by using the characteristic double-sided adhesive sheet.

The feature of this invention is that a double-sided adhesive sheet with this laminate as a core is constructed by taking advantage of the imperfect adhesion of a melt-extruded laminate of a transparent plastic film and a specific heat-bondable thermoplastic resin. It's about doing.

Hereinafter, the functions of the double-sided pressure-sensitive adhesive sheet according to the present invention will be explained in principle with reference to the configuration diagram.

In the present invention, in the sectional view of the laminate used in the product of the present invention shown in FIG. 1, one of the transparent plastic films 1 selected from polyethylene terephthalate film, polypropylene film, and acetate film is Ethylene on the surface
A laminate 3 in which a thermoplastic resin 2 made of a thyl acrylate copolymer or a mixture of an ethylene-vinyl acetate copolymer and polyethylene is melt-extruded and laminated plays an important role.

The purpose of mixing polyethylene with ethylene-ethyl acrylate copolymer or ethylene-vinyl acetate copolymer in thermoplastic resin 2 is to combine the property that polyethylene has difficulty adhering to other plastic resins and the ethylene-ethyl acrylate copolymer. , or the low-temperature thermal adhesive properties 2 of ethylene-vinyl acetate copolymer.

That is, because the transparent plastic film 1 and the thermoplastic resin 2 are melt-extruded and laminated, they do not peel or peel from each other under the external force that is applied during normal handling.
Indicates a state of adhesion that will not separate.

However, due to the presence of polyethylene in the thermoplastic resin 2, this adhesion is only a pseudo-adhesion caused by fixation after melt adhesion, and the bonding angle is 90° to 180°
It is very easy to separate the two directions. According to the experiment of the present invention, the T-type peeling force (20°C, peeling speed 200 m/min) of the laminate 3 is approximately
It was about 15 to 30 kg/5 cm ² , which was significantly lower than that of ordinary pressure-sensitive adhesives.

Next, the effect of the polyethylene of ethylene-ethyl acrylate copolymer or ethylene-vinyl acetate copolymer in the thermoplastic resin will be described.

The thermoplastic resin 2 separated by the T-shaped peeling was sandwiched between two sheets of ordinary high-quality paper (81.4 g/m ² ).
After thermocompression bonding under the conditions of 120C and 2 kg/cm ² , T-peeling was performed, and the bonding ability was strong enough to break high-quality paper.

As shown in the sectional view for explaining the structure of the double-sided adhesive sheet shown in FIG. 2, the present invention consists of release liners 5, 5' provided on both sides of the laminate 3 via adhesive layers 4, 4'. It's on.

When creating a composite display label, the release liners 5, 5' are peeled off and individual display labels are affixed.
This composite display label looks like a single label sheet, but if necessary, it can be easily peeled off and separated at the intermediate layer of the laminate 3 to form two display labels with different displays. Furthermore, the separated thermoplastic resin 2 of the display label remaining can be attached to other articles and stored by thermocompression bonding with an iron or the like, if necessary.

〔Example〕

A resin 2 made of a mixture of ethylene-ethyl acrylate copolymer and polyethylene is melt-extruded and laminated to a thickness of 15μ on one side of a transparent plastic film 1 made of stretched polypropylene with a thickness of 25μ, and an adhesive 4 is applied on both sides of the laminate 3. A double-sided pressure-sensitive adhesive sheet was prepared as shown in FIG. 2 by providing release liners 5, 5' through the film 4'.

After peeling off the release liners 5 and 5' of the double-sided adhesive sheet, display labels 6 and 6' printed and displayed on both sides or one side are attached to create a composite display label, and the thermoplastic A half die-cut portion 7 was provided on the display label on the resin 2 side, and a composite display label with a cross section as shown in FIG. 3-1 was created. Here, the depth of the half die-cut portion 7 was set to be greater than the boundary between 1 and 2 of the laminate 3.

Next, as shown in FIG. 3-2, the cut out portion 38 was peeled off and separated to obtain small chips for display labels. As a result of this work, it became possible to read indications that were initially invisible from a single label sheet.

The small chips could be collected by themselves, or they could be collected and organized by being heat-pressed onto a mount 9 using an iron as shown in Figure 3-2. Figure 3-3 shows a cross-sectional view of the die-cut portion.

[Effect of idea]

In the double-sided adhesive sheet of the present invention, display labels for various different display purposes are normally bonded and laminated together so that they do not peel off or become misaligned with each other, but they can be easily peeled off and removed as needed. A composite label can be created that can be separated and easily attached to other products for which the separated display label is intended, and therefore can be applied to a variety of uses not seen with conventional adhesive sheets for display labels. It is industrially useful.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of the laminate used in the present invention, FIG. FIG. 3-2 is a cross-sectional view showing the state of the composite display label that has been die-cut, and FIG. 3-3 is a cross-sectional view showing the die-cut portion. In the figure, 1...transparent plastic film, 2...
...Thermoplastic resin, 3... Laminate, 4, 4'... Adhesive, 5, 5'... Release liner, 6, 6'... Display label, 7... Half die-cut part, 8... Mold Cut out part, 9... mount.

Claims (1)

[Claims for Utility Model Registration] 1. A thermoplastic resin 2 is disposed on one side of a transparent plastic film 1 in a pseudo-adhesive state that does not naturally peel off and can be easily peeled off by melt extrusion lamination. A release liner 5 is applied to both sides of the laminate 3 via adhesive layers 4 and 4'.
A double-sided adhesive sheet characterized by being provided with 5'. 2. The double-sided adhesive sheet according to claim 1, wherein the transparent plastic film 1 is made of at least one of polyethylene terephthalate film, polypropylene film, acetate film, and polyethylene film. 3. The double-sided adhesive sheet according to claim 1, wherein the thermoplastic resin 2 is made of a mixture of an ethylene-ethyl acrylate copolymer or an ethylene-vinyl acetate copolymer and polyethylene.