JP2000167961A - Foamable elastic member with adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively and easily adhere a foamable elastic member by directly coating a surface of the member with an adhesive to form an adhesive layer, and providing a release sheet on the layer. SOLUTION: The foamable elastic member with an adhesive comprises a foamable elastic member 1 having a predetermined ratio of closed cells therein and an adhesive layer 2 provided over an overall surface by directly coating one surface side of the member 1 with the adhesive by utilizing, for example, a pressure of a squeegee of a screen printer. A release sheet 3 is adhered to the surface of the layer 2. The layer 2 is filled in bubbles of the surface of the member 1. The member 1 is preferably selected from the group consisting of a polyurethane, a silicone rubber, a CR, an SBR, an NR and an NBR. Further, an expansion ratio of the member 1 is 1.2 to 5 times, and a ratio of the closed cells is preferably 50% or above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed elastic member with an adhesive, and more particularly to a foamed elastic member with an adhesive which is suitably used as an ejection rubber for a punching die, a pad for preventing double feeding of printer paper, and the like.

[0002]

2. Description of the Related Art Conventionally, foam elasticity has been used, for example, as an ejection rubber of a punching machine for punching a punched sheet material such as wrapping paper into a predetermined shape, or as a pad for preventing double feeding of recording paper such as OA equipment. A member or the like is used. This foamed elastic member is bonded, for example, with a double-sided tape, or, for example, an adhesive is applied to the surface of the foamed elastic member on the spot, and attached.

[0003]

However, in the former case, since the pressure-sensitive adhesive does not easily enter the cells of the foamed elastic member, the adhesive strength is insufficient and peeling is apt to occur, and the price of the double-sided tape is high. Therefore, there is a problem that the cost becomes high.

In the latter case, there are problems that the working environment is contaminated by the solvent in the adhesive, the accuracy of the thickness and position of the coating film is low, and that the control of the coating amount is difficult. Further, there is a problem that the cost is high because the attaching operation takes time.

[0005] In view of such circumstances, an object of the present invention is to provide a foamed elastic member with a pressure-sensitive adhesive which can be securely and easily attached.

[0006]

[Means for Solving the Problems]

[Claims] A first aspect of the present invention that solves the above-mentioned problem is that a foamed elastic member, an adhesive layer formed by directly applying to the surface of the foamed elastic member, and provided on the adhesive layer And a release paper provided with the pressure-sensitive adhesive.

Here, it is preferable that the pressure-sensitive adhesive layer is filled in bubbles on the surface of the foamed elastic member.

It is preferable that the foamed elastic member is made of a material selected from the group consisting of polyurethane, silicone rubber, CR, SBR, NR and NBR.

Further, the foaming elastic member has a foaming ratio of:
It is preferably 1.2 to 5 times and the closed cell rate is 50% or more.

It is preferable that the pressure-sensitive adhesive layer is provided by being applied to the foamed elastic member by a squeegee of a screen printer.

[0011] The foamed elastic member with the adhesive may be an ejection rubber for a punching die.

Further, the foamed elastic member with an adhesive is
For example, a double feed prevention pad for preventing double feed of recording paper or the like of an OA device may be used.

In the present invention, since the pressure-sensitive adhesive is filled in the bubbles on the surface of the foamed elastic member, the contact area between the foamed elastic member and the pressure-sensitive adhesive layer is increased as compared with the conventional one, and the adhesive strength is increased. I do. Further, since 50% or more of the cells of the foamed elastic member are closed cells which are not communicated with each other, the adhesive does not enter the inside of the foamed elastic member more than necessary. There is no loss of feel.

Further, the shape of the foamed elastic member with an adhesive of the present invention is not particularly limited. For example, as shown in FIG.
Foam elastic member 1 having a predetermined proportion of closed cells inside
And a pressure-sensitive adhesive layer 2 provided on the entire surface by directly applying a pressure-sensitive adhesive using, for example, the pressure of a squeegee of a screen printing machine. Also,
A release paper 3 is adhered to the surface of the adhesive layer 2,
When this foamed elastic member with an adhesive is used, it can be easily used simply by peeling off the release paper 3 on site.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments, but the present invention is not limited to the embodiments unless it is contrary to the gist of the present invention.

Examples 1 to 3 In each of the examples, the conditions as shown in Table 1 below, that is, the expansion ratio was 1.
An adhesive (viscosity: 250 poise, solid content: 48%) is coated on one side of a foamed elastic member having 2 to 5 times and having a closed cell ratio of 50% or more using a 70-mesh screen made of polyester. Speed: 100mm / se
c, Coating at a squeegee angle: 40 ° to form a pressure-sensitive adhesive layer, to obtain a foamed elastic member with a pressure-sensitive adhesive of each example. At this time, the thickness of the pressure-sensitive adhesive layer was about 45 μm.

(Comparative Example 1) In Comparative Example 1, the foamed elastic member was made to meet the conditions shown in Table 1 below, that is, the foaming ratio was 5 times or more.
Further, it was formed in the same manner as in Example 1 except that the closed cell ratio was made smaller than 50%.

Comparative Example 2 In Comparative Example 2, a double-sided tape (Nitto Denko N
o. By attaching 501F), a foamed elastic member with a pressure-sensitive adhesive of this comparative example was obtained.

[0019]

[Table 1] *: (Nitto Denko No.501F)

Here, tests were conducted to examine the 180 ° peel strength, durability, and the presence or absence of migration of the pressure-sensitive adhesive to the surface of the foamed elastic member with a pressure-sensitive adhesive of each of Examples and Comparative Examples. The results are shown in Table 2 below.

The foamed elastic members with an adhesive other than Example 3 are ejection rubbers for punching dies, each of which is bonded to plywood and subjected to various tests. It is a test.

On the other hand, the foamed elastic member with the pressure-sensitive adhesive of Example 3 is a double feed prevention pad, which is joined to an ABS to perform the above-mentioned tests. The durability is a continuous paper passing durability test.

[0023]

[Table 2]

As shown in Table 2, the 180 ° peel strength is:
It can be seen that by applying the pressure-sensitive adhesive directly to the foamed elastic member, it is significantly improved as compared with Comparative Example 2 using a double-sided tape. Further, as in Examples 1 to 3, the expansion ratio of the foamed elastic member was set to 1.2 to 5 times, and the closed cell ratio was set to 5
It can be seen that by setting it to 0% or more, it is further improved as compared with Comparative Example 1 using a foamed elastic member outside this condition.

Further, it can be seen that the durability of the foamed elastic member with the pressure-sensitive adhesive of each of the examples is several tens times higher than that of each of the comparative examples. The foamed elastic member with an adhesive of Example 3 has no particular comparison, but there is no problem even if 100,000 sheets are passed, and sufficient durability is obtained. In Example 2, transfer of the pressure-sensitive adhesive to the surface was confirmed, but none of the examples was confirmed, and the characteristics of the foamed elastic member were well maintained.

[0026]

As described above, in the present invention, the pressure-sensitive adhesive is directly applied to the surface of the foamed elastic member to form a pressure-sensitive adhesive layer, and the pressure-sensitive adhesive enters the bubbles on the surface.
Thereby, the adhesive strength can be improved. Also,
By setting the closed cell ratio of the cells of the foamed elastic member to a predetermined value or more, it is possible to prevent the foamed elastic member from entering the inside of the foamed elastic member more than necessary, thereby preventing an increase in hardness and a change in the feel of the used surface.

Further, since the pressure-sensitive adhesive can be applied to a target position, the pressure-sensitive adhesive does not protrude and the pressure-sensitive adhesive can be used effectively without waste. Furthermore, since there is no base material holding the adhesive as in the case of a double-sided tape, in the case of an ejection rubber, the punching die is not contaminated.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a foamed elastic member with an adhesive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foam elastic member 2 Adhesive layer 3 Release paper

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Claims (7)

[Claims] 1. An adhesive comprising: a foamed elastic member; an adhesive layer formed by directly applying to the surface of the foamed elastic member; and a release paper provided on the adhesive layer. With foam elastic member. 2. The foamed elastic member with pressure-sensitive adhesive according to claim 1, wherein the pressure-sensitive adhesive layer is filled in bubbles on the surface of the foamed elastic member. 3. The foamed elastic member according to claim 1, wherein the foamed elastic member is made of polyurethane, silicone rubber, CR, SB.
A foamed elastic member with a pressure-sensitive adhesive, comprising a material selected from the group consisting of R, NR, and NBR. 4. The pressure-sensitive adhesive according to claim 1, wherein the expansion ratio of the foamed elastic member is 1.2 to 5 times, and the closed cell ratio is 50% or more. Foam elastic member. 5. The foamed elastic member with pressure-sensitive adhesive according to claim 1, wherein the pressure-sensitive adhesive layer is applied to the foamed elastic member by a squeegee of a screen printing machine. . 6. The foamed elastic member with an adhesive according to claim 1, wherein the foamed elastic member with an adhesive is an ejection rubber for a punching die. 7. The foamed elastic member with an adhesive according to claim 1, wherein the foamed elastic member with an adhesive is a double feed prevention pad.