JPH05271630A - Double-coated pressure-sensitive tape and method for fixing flexographic plate therewith - Google Patents

Abstract

PURPOSE:To provide the subject tape which can stick a carrier sheet even to a flexographic plate whose surface to be bonded with the carrier sheet is made from a rubbery material with good adhesiveness, can permit easy release of the flexographic plate from the carrier sheet and can be released in a state stuck to the flexographic plate, and to provide the subject method. CONSTITUTION:The objective tape is one prepared by forming a pressure- sensitive adhesive layer 2 comprising a rubbery pressure-sensitive adhesive on one surface of a substrate 1 made of a synthetic resin film, forming a pressure-sensitive adhesive layer 3 comprising an acrylic pressure-sensitive adhesive layer on the other surface. The pressure-sensitive adhesiveness on the one surface is higher than that on the other surface. A flexographic plate is stuck to the rubbery pressure-sensitive adhesive layer on the one surface, while a carrier sheet is stuck to the acrylic pressure-sensitive adhesive layer on the other surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided adhesive tape and a flexographic plate fixing method using the same.

[0002]

2. Description of the Related Art Flexographic plates such as rubber plates and resin plates are fixed in advance on a carrier sheet of synthetic resin film such as nylon or polyester with an adhesive or a double-sided adhesive tape.
After that, the carrier sheet is fixed to the plate cylinder by a clamp provided on the plate cylinder of the printing machine. If an adhesive is used to fix the flexographic plate to the carrier sheet, the thickness of the glue after sticking will become thick and sufficient thickness accuracy will not be obtained. Further, there is a problem that it is difficult for an operator to inhale the organic solvent contained in the paste or to reposition the flexographic plate with respect to the carrier sheet. Therefore, recently, a double-sided adhesive tape has been used instead of the adhesive.

On the other hand, in the flexographic printing plate, switching from a rubber plate which has been conventionally used to a resin printing plate is progressing. However, since the resin printing plate is expensive, only the printing surface is formed of the resin, A laminated resin plate in which a rubber plate or the like is attached is often used. Further, when cost is a problem, a conventional rubber plate may be used. In either case, the surface of the flexographic plate that is bonded to the carrier sheet is made of rubber. On the other hand, as the double-sided adhesive tape for fixing the flexographic plate, one having acrylic adhesive applied to both sides to form an adhesive layer, or one having rubber adhesive applied to both sides to form an adhesive layer is used. Has been.

[0004]

The double-sided pressure-sensitive adhesive tape using an acrylic pressure-sensitive adhesive on both sides has a problem in that it has very poor adhesiveness to rubber and is not suitable for practical use. Further, in the case where a rubber adhesive is used on both sides, there is a problem that the flexographic plate is difficult to peel off when the flexographic plate is aligned with the carrier sheet, and the re-adhesion work becomes complicated.

The present invention solves the above-mentioned problems of the prior art and can easily fix even a flexographic plate having an adhesive surface made of a rubber material, and the flexo plate can be re-attached for alignment or the like. A double-sided pressure-sensitive adhesive tape and a double-sided pressure-sensitive adhesive tape that can be easily peeled off from the carrier sheet at the time of the peeling and can be peeled off with the double-sided pressure-sensitive adhesive tape being attached to the back surface of the flexo plate It is intended to provide a method of fixing a flexographic plate.

[0006]

A double-sided pressure-sensitive adhesive tape according to the present invention is a double-sided pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer is provided on both sides of a substrate made of a synthetic resin film, and the pressure-sensitive adhesive layer on one side is a rubber-based pressure-sensitive adhesive. And the pressure-sensitive adhesive layer on the other surface is formed of an acrylic pressure-sensitive adhesive, so that the pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer on one surface is higher than that of the other pressure-sensitive adhesive layer. In the method of fixing a flexographic plate according to the present invention, a pressure-sensitive adhesive layer made of a rubber-based pressure-sensitive adhesive is formed on one surface of a substrate made of a synthetic resin film, and a pressure-sensitive adhesive layer made of an acrylic pressure-sensitive adhesive is formed on the other surface. Using a double-sided adhesive tape in which the adhesive strength of the adhesive layer on one side is higher than that of the adhesive layers on many sides, a flexo plate is attached to this rubber-based adhesive layer on one side, and the acrylic adhesive on the other side. It is characterized in that the layer is attached to a carrier sheet.

In the present invention, the acrylic pressure-sensitive adhesive is preferably a removable pressure-sensitive adhesive. The thickness of the synthetic resin film used as the substrate in the present invention is 2
It is preferably 0 to 300 μm. The material is not particularly limited as long as it is a synthetic resin film. For example, polyethylene terephthalate (PE
It is preferable to use plastic films such as T), oriented polypropylene and polyvinyl chloride. In the present invention, the adhesive force of the pressure-sensitive adhesive layer formed from the rubber-based pressure-sensitive adhesive has a peel strength of 180 ° C. with respect to the stainless steel plate and is 50
The width is preferably 0 to 3000 g / 25 mm.

In the present invention, the pressure-sensitive adhesive layer formed of an acrylic pressure-sensitive adhesive has a smaller adhesive force than that of a rubber-based pressure-sensitive adhesive, and has a peel strength of 180 ° C. against a stainless steel plate and a width of 50 to 1000 g / 25 mm. Is desirable. Further, in the present invention, the pressure-sensitive adhesive layer can be formed in a stripe shape so that air is not accumulated on the adhesive surface. That is, by forming the pressure-sensitive adhesive layer in a stripe shape and continuing the groove between the stripe-shaped pressure-sensitive adhesive layers to the end of the adhesive tape, air is allowed to escape through this groove so that air does not accumulate on the adhesive surface. can do.

[0009]

In the double-sided pressure-sensitive adhesive tape of the present invention, one pressure-sensitive adhesive layer is formed of a rubber-based pressure-sensitive adhesive, and the pressure-sensitive adhesive layer is made stronger than the pressure-sensitive adhesive layer formed of an acrylic-based pressure-sensitive adhesive on the other side. Therefore, by adhering the adhesive layer on which the rubber-based adhesive is formed to the rubber portion of the flexographic plate, the flexographic plate can be fixed with high adhesive force. The other surface is made of an acrylic pressure-sensitive adhesive and has a lower adhesive strength than the rubber-based pressure-sensitive adhesive. Therefore, when the flexographic plate is attached to the carrier sheet using the double-sided adhesive tape of the present invention, it can be easily peeled from the carrier sheet. Moreover, the double-sided pressure-sensitive adhesive tape can be peeled off while being attached to the flexographic plate. Therefore, the flexographic plate can be easily peeled from the carrier sheet when the flexographic plate is aligned with the carrier sheet or when the plate is changed and replaced with another plate.

In the present invention, a synthetic resin film is used as the base material. When non-woven fabric or paper is used as the substrate, the adhesive on one side and the other side are impregnated into the substrate,
As a result, both adhesives may come into contact with each other or may be mixed. In such a case, the low molecular weight components in the individual pressure-sensitive adhesives may migrate to each other, resulting in a decrease in the adhesive strength or deterioration of the pressure-sensitive adhesives. In order to prevent such migration of low molecular weight components between the adhesives, a synthetic resin film is used as the substrate in the present invention. In addition, in the present invention, as described above, it is preferable to use a removable adhesive as the acrylic adhesive. By using the re-peelable pressure-sensitive adhesive, when the flexographic plate is peeled from the carrier sheet, the pressure-sensitive adhesive does not remain on the carrier sheet, that is, so-called adhesive residue does not occur, and the flexographic plate can be easily peeled off.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a bottom view. With reference to FIGS. 1 and 2, a rubber-based pressure-sensitive adhesive is applied in a stripe shape on one surface of the base material 1 to form a rubber-based pressure-sensitive adhesive layer 2. On the other surface of the base material 1, similarly, an acrylic adhesive is applied in stripes to form an acrylic adhesive layer 3. A release paper 4 is attached onto the acrylic pressure-sensitive adhesive layer 3. By forming the pressure-sensitive adhesive layer in a stripe shape in this manner, when the double-sided pressure-sensitive adhesive tape is attached, air does not enter the adhesive surface, and even if it enters, air can escape through the groove between the stripes to the outside. Therefore, air does not accumulate on the adhesive surface.

In this example, a PET film having a thickness of 200 μm was used as the base material 1. The rubber-based pressure-sensitive adhesive layer 2 is a rubber-based pressure-sensitive adhesive (manufactured by Sankyo Chemical Industry Co., Ltd., trade name; GRN-13B).
To a thickness of 50 μm, with a width of 10 mm and 2 mm
It was formed by applying in stripes at intervals of. As the acrylic pressure-sensitive adhesive layer 3, an acrylic pressure-sensitive adhesive (manufactured by Sankyo Chemical Industry Co., Ltd., trade name; Liquidin AR-2006) is used, and this acrylic pressure-sensitive adhesive (Liquidine AR-2006) 10
2 parts by weight of an isocyanate-based curing agent relative to 0 part by weight (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Coronate L-
55E) is blended, and this adhesive is 2 mm with a width of 10 mm.
It was formed by coating in a stripe shape so that the thickness becomes 30 μm at intervals of.

When the adhesive strength of this double-sided adhesive tape was measured, the adhesive strength of the rubber-based adhesive layer 2 was 2000 g / 25 mm width at 180 ° C. peel strength with respect to the stainless steel plate.
The adhesive strength of the acrylic pressure-sensitive adhesive layer 3 was 800 g / 25 mm width at 180 ° C. peel strength with respect to the stainless steel plate.

Using the double-sided pressure-sensitive adhesive tape produced as described above, a flexographic plate obtained by laminating a resin plate on a rubber plate and laminating the resin plate was fixed to a carrier sheet made of PET film. When the rubber-based pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape was attached to the back surface of the flexo plate made of rubber material, air did not enter the adhesion surface, and the adhesion was very good. next,
Peel off the release paper 4 to expose the acrylic pressure-sensitive adhesive layer 3,
The carrier sheet was pasted while repositioning. At this time, the adhesive tape was peeled off after being attached several times, but at the time of peeling, the double-sided pressure-sensitive adhesive tape was not left on the carrier sheet side, and was peeled off while being stuck on the flexographic plate side. Moreover, the adhesive layer was not left on the carrier sheet and could be easily reattached.

After positioning, the flexographic plate was finally attached to the carrier sheet. At this time, air did not enter between the acrylic pressure-sensitive adhesive layer 3 and the carrier sheet, and good adhesion could be achieved. .. Conventionally, air remains on the adhesive surface,
In order to remove this air, a hole was made from the side of the carrier sheet with a needle to allow the air to escape. Like the double-sided pressure-sensitive adhesive tape of this embodiment, by forming the adhesive layer in a stripe shape, the adhesive surface can be adhered without leaving air.

In the embodiment shown in FIGS. 1 and 2, both the rubber-based pressure-sensitive adhesive layer and the acrylic-based pressure-sensitive adhesive layer were formed in stripes. However, as shown in FIG. Rubber adhesive layer 12 and acrylic adhesive layer 13
And the release paper 14 may be attached on the acrylic pressure-sensitive adhesive layer 13. Further, only one of the rubber-based pressure-sensitive adhesive layer and the acrylic pressure-sensitive adhesive layer may be formed in a stripe shape as shown in FIGS.

[0017]

As described above, according to the present invention,
Since the pressure-sensitive adhesive layer made of the rubber-based pressure-sensitive adhesive is formed on one surface, the double-sided pressure-sensitive adhesive tape can be attached to the adhesive surface of the flexographic plate made of rubber material with good adhesive force. Moreover, the adhesive force of the acrylic adhesive on the other side is weaker than that of the rubber adhesive, so double-sided adhesive is required when peeling the flexographic plate from the carrier sheet. The tape can be peeled off from the carrier sheet while it is still attached to the flexographic plate. Therefore, by using the double-sided pressure-sensitive adhesive tape of the present invention, it is possible to reattach the flexographic plate more easily than before when aligning the flexographic plate.

In the examples, the flexographic plate made of a resin plate having only the adhesive surface made of a rubber material is described as an example, but the double-sided pressure-sensitive adhesive tape of the present invention is not limited to these flexographic plates, and the whole is not limited. It can also be used for flexographic printing plates formed from rubber and other flexographic printing plates.

[Brief description of drawings]

FIG. 1 is a sectional view showing a double-sided pressure-sensitive adhesive tape according to an embodiment of the present invention.

FIG. 2 is a bottom view of the embodiment shown in FIG.

FIG. 3 is a cross-sectional view showing a double-sided pressure-sensitive adhesive tape according to another embodiment of the present invention.

[Explanation of symbols]

 1, 11 ... Base material 2, 12 ... Rubber-based adhesive layer 3, 13 ... Acrylic adhesive layer 4, 14 ... Release paper

Claims (4)

[Claims] 1. A double-sided pressure-sensitive adhesive tape comprising a base material made of a synthetic resin film and pressure-sensitive adhesive layers provided on both sides, wherein the pressure-sensitive adhesive layer on one side is formed of a rubber pressure-sensitive adhesive and the pressure-sensitive adhesive layer on the other side is formed. A double-sided pressure-sensitive adhesive tape, which is formed from an acrylic pressure-sensitive adhesive and has a pressure-sensitive adhesive layer on one side having a higher adhesive strength than a pressure-sensitive adhesive layer on the other side. 2. The double-sided adhesive tape according to claim 1, wherein the acrylic adhesive is a removable adhesive. 3. The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the rubber-based pressure-sensitive adhesive of the pressure-sensitive adhesive layer on the one surface is applied in a stripe shape. 4. A pressure-sensitive adhesive layer made of a rubber-based pressure-sensitive adhesive is formed on one surface of a substrate made of a synthetic resin film, and a pressure-sensitive adhesive layer made of an acrylic-based pressure-sensitive adhesive is formed on the other surface of the substrate. Using a double-sided adhesive tape that has a higher adhesive strength than the adhesive layer on the other side, stick the flexo plate to the rubber-based adhesive layer on one side, and the acrylic-based adhesive layer on the other side to the carrier sheet. A method of fixing a flexo plate, which is characterized by wearing.