JPH03112575A - Manufacture of golf grip - Google Patents

Abstract

PURPOSE:To simplify a manufacturing process by a method wherein, after the surfaces of protruded line parts formed on a mold surface are coated with paint by using a masking, an unvulcanized rubbery material is inserted in a molding tool togetherwith an insertion block, and after clamping of a mold, heating is effecting for vulcanization. CONSTITUTION:In a state that top and bottom molds 1 and 2 are set, a masking 6 is brought into a state in which protruded line parts 5 are engaged with respective slits 7. When the masking 6 is coated with paint through spray or by using a brush, the solvent of the paint applied on mold surface 1a and 2a is rapidly vaporized by means of the surplus heat of a molding tool and therefore, the paint remains on the surface of protruded line parts 5 in a state to form a film. The masking 6 is then removed and a given amount of an unvulcanized rubbery material is charged between the top and bottom molds 1 and 2 togetherwith an insertion block 4. The top and bottom molds 1 and 2 are clamped together, the unvulcanized rubbery material is forcibly spread to every corner (compression molding), and the top and bottom molds 1 and 2 are heated to vulcanize the rubbery material. Thereafter, by effecting demolding, a gold grip 8 in the outer peripheral surface where a number of recessed grooveform pattern 9 is formed is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a method of manufacturing a rubber golf grip to be attached to a golf club.

2. Description of the Related Art Golf grips that are attached to the end of the shaft of a golf club are often made of rubber and shaped into a substantially cylindrical shape.

In rubber golf grips, groove-like patterns are commonly formed on the surface for decoration and anti-slip purposes, and the grooves are usually coated with a suitable color. It forms a so-called line color.

In order to manufacture rubber golf grips with such line colors, protrusions corresponding to the pattern are formed on the surface of a molding die, and unvulcanized rubber material is placed in this molding die. A golf grip with grooves on the surface is formed by pressing, heating and vulcanizing. The golf grip is then dipped into a paint bath to deposit paint over its entire surface.

If two or more colors are used, the second and subsequent colors are applied to the required areas using a brush or the like. After the paint dries, the golf grip surface is polished. This polishing removes excess paint from areas other than the grooves, leaving the paint in the grooves as a pattern. At the same time, this polishing makes the golf grip surface rough, providing an anti-slip effect.

Problems to be Solved by the Invention However, the conventional manufacturing method described above has the disadvantage that a painting process and a polishing process are required after the golf grip is molded, which complicates the manufacturing process and increases manufacturing costs.

Means for Solving the Problems In the method for manufacturing a golf grip according to the present invention, the mold surface of a molding die is roughened, and protrusions corresponding to a desired pattern are formed in advance, and the protrusions are After applying paint to the surface of the mold using masking, the unvulcanized rubber material is inserted into the mold together with the core, and after the mold is clamped, the material is heated and vulcanized.

The paint applied to the ridges of the working mold immediately becomes a film because the residual heat of the mold evaporates the solvent. Since the golf grip is molded in this state, a groove-like pattern is formed on the surface of the molded golf grip, and at the same time, the coating film is transferred along the inside of the grooves. Furthermore, by making the mold surface rough, the golf grip surface becomes rough, and polishing after molding becomes unnecessary.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, the configuration of the molding die will be explained with reference to FIG. This molding die has a concave groove shape with a semicircular cross section on the mold surface 1a.
. It consists of a rod-shaped core 4 disposed between the lower molds 2. It should be noted that since the golf grip has a gently tapered shape with a larger diameter at the upper end, the mold surfaces 1a and 2i are also formed in a gently tapered shape correspondingly. Further, a large-diameter cylindrical support part 4a is formed at the end of the core 4, and the support part 4a is held between the upper mold 1 and the lower mold 2 to support the core 4. This also closes the other end of the cavity.

Then, the above upper mold 1. As shown in detail in FIG. 3, the mold surfaces 1a and 2a of the lower mold 2 are provided with protrusions 5 corresponding to a desired pattern.
is formed. In the illustrated example, the protrusions 5 are provided so as to form a large number of linear patterns along the longitudinal direction of the golf grip. Further, the surfaces other than the protruding portions 5 are appropriately roughened.

Next, a method for manufacturing a golf grip using the above-mentioned molding die will be explained in order of steps.

First, the upper mold 1 of the molding die. A masking 6 is attached to each of the lower molds 2 (see FIG. 1). This masking 6
is a sheet-like material made of a thin metal plate or synthetic resin, etc., and is molded into a shape that follows the mold surfaces 1a and 2a, and has a large number of slits 7 formed therein corresponding to the protrusions 5. .

Therefore, upper mold 1. When set in the lower mold 2, the protrusions 5 are fitted into each slit 7, respectively.

Then, paint is applied over the masking 6 using a spray, brush, or the like. As a result, the paint adheres substantially only to the surface of the protrusion 5.

As the above-mentioned paint, rubber-based paint, epoxy-based paint, urethane-based paint, etc. can be used. - As an example, the following compound may be used in an unvulcanized state dissolved in an organic solvent.

Ethylene propylene rubber 100 parts by weight Zinc oxide
5 parts by weight stearic acid
1 part by weight inorganic pigment
Appropriate accelerator (CBS) 1.5 parts by weight (TMTD) 0.5 parts by weight Sulfur 1 part by weight The paint applied to the mold surfaces 1a and 2a in this way loses its solvent due to the residual heat of the molding die. Since it evaporates quickly, it remains as a coating film on the surface of the protrusion 5.

Next, the masking 6 is removed, and a predetermined amount of unvulcanized rubber material is inserted between the upper mold 1 and the lower mold 2 together with the core 4. Then, the upper mold 1 and the lower mold 2 are clamped together, and the unvulcanized rubber material is forced and spread into each part of the cavity. That is, so-called combination molding is performed. According to this compression molding, the rubber material does not flow violently, so that the paint is prevented from spreading.

After mold clamping, upper mold 1. The lower mold 2 is heated to vulcanize the rubber material.

When the mold is removed thereafter, a golf grip 8 having a large number of groove-like patterns 9 on the outer peripheral surface is completed, as shown in FIG. Here, in the concave groove of the pattern 9, there is a protrusion 5.
The paint attached to the surface is transferred.

In addition, the surface of the golf grip 8 other than the pattern 9 is the mold surface lλ
, 2a, so that a sufficient anti-slip effect can be obtained as is. Therefore,
A polishing process after molding is not necessary.

Effects of the Invention As is clear from the above explanation, according to the method for manufacturing a golf grip according to the present invention, the paint is transferred from the mold along the groove-like pattern at the same time as the golf grip is formed. Molding and painting can be done in one step, simplifying the manufacturing process. In particular, by forming the outer surface into a rough surface in advance, the polishing step can be omitted, and manufacturing costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the masking installation step of the manufacturing method according to the present invention, FIG. 2 is an exploded perspective view of a molding die used in this manufacturing method, FIG. 3 is a perspective cross-sectional view of the main parts, and FIG. FIG. 4 is a perspective view of the manufactured golf grip. l...upper mold, 2...lower mold, 4...core, 5...
Projection part, 6...Masking. 6...Masking Figure 2

Claims (1)

[Claims] (1) Make the mold surface of the molding die rough and form protrusions corresponding to the desired pattern. After applying paint to the surface of the protrusions using masking, A method for manufacturing a golf grip, which comprises inserting an unvulcanized rubber material into a mold together with a core, and heating and vulcanizing the material after clamping the mold.