JPH08188754A - Adhesive double coated tape or sheet for fixing rubber of table tennis racket - Google Patents

Abstract

PURPOSE: To obtain the subject product capable of firmly fixing rubber on a racket face in using, readily separating from the racket face and the rubber in renewing of rubber and readily washing stuck dust, etc., on the adhered face by comprising a specific constitution. CONSTITUTION: The objective product has a strong adhesive layer on one face and a weak adhesive layer composed of a polyurethane-based adhesive on the other face, preferably thickness of each adhesive layer is 10-100μm. An adhesive force of the strong adhesive layer to stainless steel (SP) is preferably 200-3000gf/25mm and an adhesive force of the weak adhesive layer to SP is preferably 10-500gf/25mm. As the adhesive constituting the strong adhesive layer, an acrylic-based emulsion-type adhesive, etc., is preferable. In sticking rubber on a racket board and fixing, preferably the strong adhesive layer is stuck on the rubber side and the weak adhesive layer is stuck on the racket board side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided tape or sheet for fixing rubber to a table tennis racket.

[0002]

2. Description of the Related Art In a table tennis racket, only the rubber is often replaced due to the tactical need of the opponent or the wear of the rubber. Conventionally, the rubber of a table tennis racket has been fixed by applying a rubber-based solution type contact adhesive.

[0003]

However, the above-mentioned conventional adhesive contains a large amount of an organic solvent in order to dissolve or disperse the adhesive components such as rubber, tackifying resin and filler. In addition to causing environmental pollution in, there is a problem that it is abused for thinner play and the like.

Further, when the above-mentioned conventional double-sided tape is used, there is a difference in adhesive force between the wooden part of the racket surface and the rubber. Therefore, if the rubber is firmly fixed, the double-sided adhesive tape will wipe off the wooden part of the racket surface when reattaching. Was often the case.

The present inventor has conducted earnest research on the sticking and fixing of the rubber of the table tennis racket with the double-sided tape or sheet, and as a result, the rubber is firmly fixed to the racket surface during use, and when the rubber is replaced. The double-sided adhesive tape or sheet can be easily peeled from the wooden part of the racket surface and from the rubber without soiling each surface, and dust or sand adhering to the adhesive surface at the time of replacement can be easily washed with water. He came up with the invention of a double-sided tape or sheet for fixing a rubber table tennis racket.

[0006]

SUMMARY OF THE INVENTION The present invention is a double-sided tape for fixing a rubber of a table tennis racket, characterized in that a strong adhesive layer is provided on one surface and a weak adhesive layer made of a polyurethane adhesive is provided on the other surface. Alternatively, the main point is a sheet.

In the present invention, the term "strong viscous" or "weak viscous" is used as a relative scale, and a strong adhesive layer preferably has a stainless steel plate (SP) adhesive strength of 20.
0 to 3000 gf / 25 mm, and the weak adhesive layer is preferably an adhesive layer having an SP adhesive force of 10 to 500 gf / 25 mm, and SP of the strong adhesive layer> SP of the weak adhesive layer
Should be satisfied. Graceful, what is SP adhesive strength here? J
It refers to the adhesive strength of a double-sided tape or sheet measured in accordance with IS Z 0237 (adhesive tape / adhesive sheet test method) and 180 ° peeling under normal conditions of a cold-rolled stainless steel sheet.

The double-sided tape or sheet for fixing the rubber of the table tennis racket of the present invention has a difference in adhesiveness between the racket surface and the rubber surface. Therefore, when the rubber is stuck and fixed on the racket plate, the strong adhesive layer is attached to the rubber side. The weak adhesive layer is attached to the racket board side.

The SP adhesive strength of the strong adhesive layer is 200 gf /
If it is less than 25 mm, the adhesive force with the rubber may be insufficient, and the rubber may float or peel off from the racket plate surface. On the other hand, if it exceeds 3000 gf / 25 mm, the rubber may be peeled off from the double-sided tape or sheet without damaging the double-sided tape or sheet when the adhered double-sided tape or sheet is to be repaired, for example, to correct a defect of the double-sided tape or sheet. It gets harder.

The SP adhesive strength of the weak adhesive layer is 10 gf / 2.
If it is less than 5 mm, the adhesive force to the racket plate surface may be insufficient, and the rubber may float or peel off from the racket plate surface. On the contrary, if it exceeds 500 gf / 25 mm,
When changing the type of rubber or replacing it with a new rubber, it may be difficult to remove it from the racket board surface, the adhesive layer may remain on the racket board surface, or the racket board surface may be damaged, for example .

The pressure-sensitive adhesive forming the strong pressure-sensitive adhesive layer is as follows:
The adhesive is not particularly limited as long as it exhibits the above-mentioned adhesive force, and for example, solvent-based or latex-based adhesives containing natural rubber or synthetic rubber as a main component, acrylic solvent-based or emulsion-based adhesives Can be preferably used.

Further, as the adhesive constituting the weak adhesive layer,
A polyurethane adhesive is used. The type of the polyurethane-based pressure-sensitive adhesive is not particularly limited, and may be, for example, a thermoplastic polyurethane, but may be a polyisocyanate or a prepolymer, or a one-pack type. It may be polyurethane or may be two-component polyurethane.

Since the weak adhesive layer made of the above polyurethane adhesive exhibits appropriate surface tackiness, it can be easily peeled off from the racket surface at any time, and can be re-adhered at any time and used. Dirt such as dust and sand adhered to the surface of the adhesive layer can be easily reused by washing with water and drying such as air drying.

The strong adhesive layer and the weak adhesive layer should not become too thick and affect the repulsion of a table tennis ball. Therefore, the thickness of each adhesive layer is preferably about 10 to 100 μm.

When the thickness of the adhesive layer is less than 10 μm, a predetermined SP adhesive force may not be obtained, and conversely,
If it exceeds 100 μm, the predetermined SP adhesive strength may be exceeded, or the adhesive may exude from the side surface of the table tennis racket.

The double-sided tape or sheet for fixing the rubber of the table tennis racket of the present invention is provided with a strong adhesive layer on one side and a weak adhesive layer made of a polyurethane-based adhesive on the other side, and a release paper on one or both sides. However, it may have a support between both adhesive layers, or may be a so-called non-support type that does not have a support.

When a support is used, its type is not particularly limited, and those generally used as a support for double-sided tape or sheet such as papers, non-woven fabrics, plastic films and foamed sheets are preferred. Among them, a polyester resin film, a non-stretched polypropylene resin film, a biaxially stretched polypropylene resin film, a nonwoven fabric and the like are more preferably used.

When the support is a plastic film, its thickness is preferably in the range of about 4 to 38 μm.
If it is less than 4 μm, it is difficult to apply the adhesive because wrinkles may occur.
If it exceeds 38 μm, the bouncy of the ping-pong ball will change delicately, causing a feeling of strangeness with the conventional product. When the support is Japanese paper, non-woven fabric, etc., the basis weight is 5 to 15 g /
A range of about m ² is preferable. If it is less than 5 g / m ^2, it is difficult to apply the adhesive due to wrinkles or breaks, and if it exceeds 15 g / m ² , the momentum of table tennis changes delicately, which causes a feeling of discomfort with conventional products.

The double-sided tape or sheet for fixing the rubber of the table tennis racket of the present invention is usually laminated with a separator such as release paper or release film on both sides. As a form in which a separator such as a mold film is laminated on one surface thereof and is wound in a roll shape and stored as a wound body of a double-sided tape or sheet, and when necessary, a required amount is unwound and cut out from the wound body. Good.

In the release layer of the separator used for the wound body of the double-sided tape or sheet, the peeling force of the surface laminated and laminated on the strong adhesive layer is smaller than the peeling force of the surface laminated and laminated on the weak adhesive layer. It is preferable that the workability in the production of the above-mentioned wound body and in fixing the rubber of the table tennis racket is improved.

In general, the adhesion step of sticking and fixing the rubber on the racket board using a double-sided tape or sheet is performed by first sticking the strong adhesive layer on the rubber and then sticking and fixing the weak adhesive layer together with the rubber on the racket board. Done. Therefore, when the peeling force of the release layer of the separator of the strong adhesive layer is equal to or larger than the peeling force of the release layer of the separator of the weak adhesive layer, the first step of attaching the strong adhesive layer to the rubber is weak. The release layer of the separator of the adhesive layer may be peeled off first, and the workability may be significantly deteriorated.

The method for producing the double-sided tape or sheet for fixing the rubber of the table tennis racket of the present invention is not particularly limited, but, for example, when using the above-mentioned support, first,
Polyurethane pressure sensitive adhesive is applied directly to the support, dried, laminated with the above separator, rolled up to complete the weak pressure sensitive adhesive layer coating step, and then while rewinding this, an acrylic is separately applied on the step paper having a release surface. A strong pressure-sensitive adhesive layer obtained by applying and drying the above strong pressure-sensitive adhesive such as a system pressure-sensitive adhesive may be transferred to the other surface of the above-mentioned support and wound up to form a double-sided tape or sheet wound body. In the case of a non-support type that does not use a body, an adhesive that forms one of the strong adhesive layer and the weak adhesive layer is applied to the release layer surface of the corresponding separator, dried, and wound to complete the primary coating. Then, while rewinding this, a pressure-sensitive adhesive that forms another pressure-sensitive adhesive layer is separately applied onto a process paper having a release surface, the pressure-sensitive adhesive layer obtained by drying is transferred and laminated onto the pressure-sensitive adhesive layer surface, and wound up. Of double-sided tape or sheet It may be as critical condition.

[0023]

The double-sided tape or sheet for fixing the rubber of the table tennis racket according to the present invention has a strong adhesive layer on one surface and a weak adhesive layer made of a polyurethane adhesive on the other surface. The rubber fixing method of sticking and attaching a weak adhesive layer to the racket board side can be adopted, and the sticking work can be done very easily, and even if the sticking to the racket board side and peeling are repeated, it is comfortable for a long time. Gives a nice feeling. Further, dust and dust adhering to the weak adhesive layer can be easily cleaned by washing with water.

Further, since the double-sided tape or sheet is used for fixing the rubber of the table tennis racket, there is no concern about environmental pollution or youth's health associated with the conventional adhesive containing an organic solvent such as rubber paste. .

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings, but the present invention is not limited thereto.

(Example 1) Formation of Weak Adhesive Layer Polyether polyol-based adhesive (manufactured by No-Tape Industry Co., Ltd., trade name: G-4214B, molecular weight 3000, solid content 95%) and cross-linking agent (No-Tape Industry Co., Ltd., commercial product) Name: Polyisocyanate G-4188) mixed at a ratio of 1: 1 is applied to a polyethylene terephthalate resin film (support) having a thickness of 12 μm so as to have a thickness after drying of 35 μm and dried, and then an adhesive agent The surface was laminated with a separator.

Formation of Strong Adhesion Layer Next, 78 parts by weight of 2-ethylhexyl acrylate,
Copolymer obtained by copolymerizing 20 parts by weight of butyl acrylate and 2 parts by weight of acrylic acid (weight average molecular weight 4000
00) mixed with 25 parts by weight of hydrogenated rosin ester (softening point 70 ° C.) (70% by weight of ethyl acetate, 3 parts of toluene)
0% by weight solution, solid content 50% by weight) 100 parts by weight,
0.3 parts by weight of an epoxy-based cross-linking agent (80% by weight of toluene, 20% by weight of isopropyl alcohol, solid content: 5%) was added, coated on a process paper having a release surface and dried,
A strong adhesive layer having a thickness of 30 μm was formed and transferred to the opposite surface of the support on which the weak adhesive layer was formed to prepare a double-sided rubber-fixing tape for a table tennis racket.

Example 2 Formation of Strong Adhesion Layer 20 parts by weight of 2-ethylhexyl acrylate, 77 parts by weight of butyl acrylate, and 3 parts by weight of acrylic acid were copolymerized (weight average molecular weight 800,000) with water. 100 parts by weight of the main agent (70% by weight of ethyl acetate, a solution of 30% by weight of toluene, solid content: 45% by weight) mixed with 28 parts by weight of an added rosin ester (softening point: 120 ° C.), and an isocyanate crosslinking agent (70% by weight of ethyl acetate) %, Toluene 3
1% by weight of a solution of 0% by weight, solid content 55%) was added, and one side of a separator having a release layer on both sides was applied and dried to form a strong adhesion layer having a thickness of 30 μm and wound.

Formation of Weak Adhesive Layer Next, the adhesive used in Example 1 for the weak adhesive layer was applied onto a process paper having a release surface and dried to form a weak adhesive layer having a thickness of 50 μm. It was transferred to the layer surface to produce a double-sided tape for fixing a rubber table tennis racket.

The double-sided tape or sheet for fixing the rubber of the table tennis racket of the present invention obtained in the above examples is
The test and evaluation were carried out by the methods shown below. 1. SP adhesive strength , width 25 mm, length 150 according to JIS Z 0237
mm test pieces were prepared, and the thickness of each of the strong adhesive layer and the weak adhesive layer was 1.5 mm, the width was 50 mm, and the length was 1.
Laminated on a 50 mm SP adhesive strength test stainless steel plate so that the adhesion length is 100 mm, and 23 ° C. × 65% R
After being left in an atmosphere of H for 30 minutes, a constant speed extension type tensile tester was used to measure the tensile speed at 300 mm / min, and an average value was calculated from the obtained chart to obtain SP adhesive strength.
At the time of measurement, a polyethylene terephthalate film having a thickness of 25 μm was used as a backing material.

2. Feeling of use of racket First, rubber was attached to the strong adhesive layer, the separator was peeled off, and rubber was attached and fixed to the surface of the racket plate in the weak adhesive layer. 3 of these table tennis rackets for 5 table tennis members
They were used for a month, and their feeling of use was evaluated sensuously.

3. Rubber removability The rubber of the table tennis racket used for the previous 3 months was peeled off, and the presence of adhesive on the surface of the racket board and the presence or absence of damage such as creases on the surface of the racket board were visually observed, and the ability to replace the rubber was resealable. It was evaluated based on workability whether it was easy or not.
As an item for evaluating the rubber removability, the weak adhesive layer was purposely dusted, washed with water, air-dried, and then reattached to the racket plate surface. The evaluation results are shown in Table 1.

[0033]

[Table 1]

[0034]

Since the double-sided tape or sheet for fixing the rubber of the table tennis racket of the present invention is constructed as described above, the re-attaching work can be performed very easily, and the re-attaching and the peeling can be repeated. Even gives a comfortable feeling over the long term. Further, the dust and dust adhered to the weak adhesive layer can be easily cleaned by washing with water without impairing its performance.

Further, since the double-sided tape or sheet is used for fixing the rubber of the table tennis racket, there is no concern about environmental pollution or youth health associated with the conventional adhesive containing an organic solvent such as rubber paste. .

[0036]

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing an example of the configuration of a rubber-fixing double-sided tape or sheet for a table tennis racket of the present invention.

FIG. 2 is an enlarged cross-sectional view showing another example of the double-sided adhesive tape or sheet for fixing a rubber of the table tennis racket of the present invention.

[Explanation of symbols]

 1 support 2 strong adhesive layer 3 separator (small peeling force) 4 weak adhesive layer 5 separator (large peeling force)

Claims (1)

[Claims] 1. A double-sided tape or sheet for fixing a rubber of a table tennis racket, wherein a strong adhesive layer is provided on one surface and a weak adhesive layer made of a polyurethane adhesive is provided on the other surface.