JPH0623545Y2 - Removable adhesive sheet stack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a re-peelable pressure-sensitive adhesive sheet stacker capable of repeatedly attaching and peeling various adherends.

(Prior art) Conventionally, caution notes and message memos are written on the adhesive sheet,
A removable adhesive sheet stack that can be pasted onto an adherend such as a printed matter or an office desk and peeled off if it is not needed, or can be reattached to another place. Are known.

This type of reusable adhesive sheet stack that can be used repeatedly is constructed by applying releasable adhesive in strips along one side of one side of a rectangular paper-like sheet, and stacking multiple sheets in the same direction. Has been done. Then, in use, the uppermost sheet is sequentially peeled off from the pressure-sensitive adhesive sheet stack for use.

(Problems to be solved by the invention) However, in such a conventional adhesive sheet stack,
When peeling the uppermost sheet from this stack or peeling it from the adherend, the curl of the sheet is formed at the boundary between the portion coated with the adhesive and the portion not coated with the adhesive. The bending is large, especially when the sheet is paper.

If the sheet has a large curl, the non-adhesive part of the sheet will rise when the sheet is attached to the adherend, and the elasticity of the sheet will cause the sheet to stick naturally. It came off and it was inconvenient to use.

The present invention eliminates the above-mentioned drawbacks, curling of the sheet is small during use, so that the non-adhesive part is unlikely to rise, and the adhered part does not easily peel off naturally.
The present invention provides a removable pressure-sensitive adhesive sheet stack that can be used repeatedly.

(Means for Solving Problems) In the stack of removable pressure-sensitive adhesive sheets of the present invention, the removable pressure-sensitive adhesive is applied as a strip-shaped continuous layer along one side of one side of a foldable square sheet. It is characterized in that the sheets are stacked in the same direction, and the coating thickness of the pressure-sensitive adhesive is once reduced inward from the side edge of the sheet in its cross section.

The present invention will now be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a square foldable sheet, which is a paper-like sheet such as paper or synthetic paper, or a metal sheet such as copper foil or amyl foil. Particularly, paper is suitable in terms of writing. is there. Reference numeral 2 denotes a removable adhesive, which is applied along one side of the sheet 1 as a strip-shaped continuous layer of, for example, about 5 to 50 mm. And the thickness of this adhesive 2 is
In the cross section, the size is reduced continuously from the edge of the sheet toward the inside of the sheet. In this case, the coating thickness of the pressure-sensitive adhesive 2 is specifically about 5 to ²⁰ g / m ² at the side edge of the sheet, and is gradually reduced inward from the side edge of the sheet.

As the removable pressure-sensitive adhesive 2, for example, JP-A-50-273
Those having a composition containing acrylate copolymerized microspheres as a main component, as described in JP-A-6, are preferably used.

As described above, the adhesive 2 is attached to one side of the sheet 1 as described above.
A large number of the adhesive sheets coated with are stacked in the same direction as shown in FIG. That is, one side portion of the sheets coated with the pressure sensitive adhesive 2 is sequentially and vertically stacked in order, and is stacked as a whole as a whole to form a bundle of pressure sensitive adhesive sheets. This bundle of adhesive sheets is generally
It is formed by stacking about 100 sheets. Thus,
The removable adhesive sheet stack of the present invention is constructed. (Operation) In use, the removable pressure-sensitive adhesive sheet stack of the present invention is used by pulling the uppermost non-adhesive portion by hand upward and sequentially peeling it off. Further, even after the adhesive sheet is once attached to the adherend, the non-adhesive portion is pulled upward by hand to be peeled off and re-adhered to another place. In this way, when the adhesive sheet is pulled upward by hand, the adhesive coating thickness is small at the boundary between the adhesive and non-adhesive parts, so the adhesive strength at this part is weak and therefore smooth. Peeling is performed.

(Examples) Examples and comparative examples of the present invention will be shown below, and the effects thereof will be described.

First, as shown in FIG. 2, the re-peelable pressure-sensitive adhesive 2 was applied to the center of one side of a sheet 1 of high-quality paper, which had been subjected to a nitrocellulose-based undercoat treatment, in the lengthwise direction (direction A) with a knife coater.
It was applied with a width of mm. As shown in FIG. 3, the doctor knife of the above knife coater cuts a 30 mm wide portion (L) of the doctor knife 3 at an angle of 3 ° (θ) and a central portion depth (D) of 200 μm. What was done was used. As the removable pressure-sensitive adhesive 2, a toluene dispersion containing, as a main component, microspheres (particle size: 10 to 150 μm) of a copolymer composed of 2-ethylhexyl acrylate, acrylic acid and a small amount of divinylbenzene was used.

The width of the adhesive 2 thus coated is 30 mm, and the thickness is 1.5 g / m ² from the both ends of the coating width to 1.5 mm, and 5.4 g / m ² from 1.5 mm to 3.8 mm. , The central portion was 9.0 g / m ² .

Then, the above-mentioned pressure-sensitive adhesive paper sheet is traversed to a fixed length in the lengthwise direction, 10 sheets are stacked in the same direction, and then this stack is taken at the portion corresponding to the center of the pressure-sensitive adhesive 2 in the lengthwise direction (A Direction), and thus the adhesive 2 having a width of 15 mm was applied along one side of one side of the paper sheet 1 to obtain an intermediate product of the adhesive paper sheet stack which was divided into two. This intermediate product was traversed along the width direction (B direction) to manufacture a product of a pressure-sensitive adhesive paper sheet stack having a length of 70 mm and a width of 70 mm.

For comparison, a pressure-sensitive adhesive paper sheet stack was manufactured in the same manner as in Example except that a doctor knife of an ordinary knife coater was used and the clearance was 200 μm.
In this case, the thickness of the adhesive is 9.0g / m, which is the same everywhere.
^{It was 2} .

Sheets were peeled off one by one from the pressure-sensitive adhesive paper sheet stacks of the above Examples and Comparative Examples, and the state of the sheets immediately after that was observed. As a result, in the example, the bending of the sheet was small (angle 5 ° or less), and in the comparative example, the bending of the sheet was large (angle 45 °). Further, as described above, the sheets were peeled off one by one from the adhesive paper sheet stack, and this was attached to a high-quality paper using a 2 kg rubber roll, and after 24 hours at a temperature of 40 ° C. and a relative humidity of 60%, The state of the sheet was observed. As a result, peeling did not occur in the example, but in the comparative example, peeling occurred over about 5 mm from the boundary portion between the adhesive portion and the non-adhesive portion.

(Effects of the Invention) As described above, in the removable pressure-sensitive adhesive sheet stack of the present invention, the thickness of the pressure-sensitive adhesive coated as a strip-shaped continuous layer on one side of the sheet is the edge of the sheet in the cross section. It is made smaller continuously from the inside to the inside. Therefore, the adhesive force at the boundary between the adhesive portion and the non-adhesive portion of the sheet becomes weakest, and the sheet can be smoothly peeled upward from the adhesive sheet stack during use.

Thus, when the sheet is peeled off smoothly,
The stress applied to the sheet is reduced, and curling of the sheet is reduced. As a result, the non-adhered portion of the sheet is unlikely to rise, and the adhered portion is unlikely to peel off naturally, which makes it easy to use and convenient, and its usefulness is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an example of the present invention product, FIG. 2 is a partially cutaway perspective view for explaining an example of a manufacturing method of the present invention product, and FIG. 3 is a manufacturing method of FIG. 3 is a partially cutaway sectional view showing an example of a doctor knife used in FIG. 1 ... Square sheet, 2 ... Removable adhesive, 3 ... Tractor knife.

Claims (1)

[Scope of utility model registration request] 1. A releasable pressure-sensitive adhesive is applied as a strip-shaped continuous layer along one side of a foldable rectangular sheet, and a large number of the pressure-sensitive adhesive layers are stacked in the same direction. Is a continuous peelable pressure-sensitive adhesive sheet stack, the cross-section of which is continuously reduced inward from the edge of the sheet.