JPH0659334B2 - Golf ball manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a golf ball, and more particularly to a method for manufacturing a golf ball which improves the workability of clear paint after marking the golf ball.

[Prior Art] A golf ball is generally formed by coating a wound, two-piece or one-piece type golf ball material with a base paint layer of white color or yellow color or orange color in some cases.
The product is made by printing (marking) characters, designs, etc. that display the manufacturer name, trademark, number, brand name, etc.

The marking method for golf balls includes thermal transfer, intaglio (pad printing), the marking method, and the like, and the thermal transfer or intaglio method is suitable for marking even inside dimples.

Generally, thermal transfer is used for marking in mass production. On the other hand, intaglio printing is adopted for marking in the case of small-quantity production because it has the advantages that it requires a small capital investment, can easily make a plate, and can also perform marking work easily.

Intaglio printing ink is available in one-liquid type and two-liquid type (reaction type), but one-liquid type has a weak adhesion strength and cannot withstand actual hitting with an iron or the like. Have. In addition, although the two-component type has higher adhesion strength than the one-component type, it cannot still sufficiently withstand actual hitting as it is, so that marking is performed in both the one-component type and the two-component type. It is necessary to apply clear paint as a reinforcing film to the places by spraying or brushing.

[Problems to be Solved by the Invention] However, when a one-component ink is used as the intaglio ink, the ink may bleed when a clear paint is applied on the intaglio ink. In the case of the type containing a solvent, the printed characters and patterns are dissolved in this solvent, and a defective marking product occurs.

For this reason, conventionally, in the manufacture of golf balls, marking and coating of clear paint have not always been easy, and their workability has also been poor.

[Means for Solving Problems] The present invention solves the above-mentioned conventional problems and improves the coating workability of the clear paint after marking of a golf ball, and at least at the marking portion of the surface of the golf ball. A method for producing a golf ball is characterized in that, after forming a film of an ultraviolet-curable coating material containing substantially no solvent, the film is cured.

The present invention will be described in detail below.

In the method of the present invention, when the clear coating is applied to at least a part of the marking portion on the surface of the golf ball, an ultraviolet curable coating containing substantially no solvent is used as the clear coating.

To mark the surface of the golf ball, mark directly on the surface of the golf ball material.

Mark the surface of the golf ball material with a white, yellow, or orange base coating.

After the above base coating is applied to the surface of the golf ball material, clear coating is applied and then marking is performed.
(In this case, as the clear paint, it is preferable to use the substantially solvent-free UV-curable paint according to the present invention.) Any of the methods can be adopted. As a marking for forming a film according to the method of the present invention, a marking carried out by intaglio printing or the like using a usual one-component or two-component ink is suitable.

In the present invention, the clear paint may be applied only to the marking portion by intaglio printing or may be applied to the marking portion by thermal transfer. Further, the entire surface of the golf ball may be painted. However, it is practical to apply only the marking area by intaglio printing. As the UV-curable coating material containing substantially no solvent, which is used as the clear coating material in the present invention, the sensitizer compounded in the coating material is 250.
Those that cause a curing reaction by absorbing light with a wavelength in the ultraviolet region of up to 450 nm are suitable, and those shown in Table 1 below are known.

Of these, vinyl polymerization type coatings are generally used, and among them, acrylic type coatings are preferable because of their fast curing speed, excellent coating film hardness and adhesiveness, and small inhibition of air curing.

As the ultraviolet curable coating material, specifically, a polyurethane acrylate-based UV optocolor clear (manufactured by Teikoku Ink Mfg. Co., Ltd.) is suitable.

The method of applying the ultraviolet curable paint is not particularly limited,
Generally, the paint viscosity is high, so
Brush coating is preferable. If you want to paint only on the marking area, use a multi-station intaglio printing machine as the intaglio printing machine for marking, and after intaglio printing the desired mark, intaglio print the UV-curable paint at the next station. This is extremely advantageous because the number of steps can be reduced and the workability can be improved.

The thickness of the coating film formed by applying the ultraviolet curable coating is usually several microns to several tens of microns, for example, 5 to 30 microns, and the formed coating film is exposed to ultraviolet rays to form a film thickness thereof. It will be hardened in about 0.3 to 3.0 seconds, though it varies depending on the UV intensity, the UV intensity, and the like.

As a light source for UV irradiation, any commercially available UV lamp for photopolymerization can be used. There are two types of commercially available lamps, a high pressure mercury lamp and a metal halide lamp, depending on the type of gas enclosed, and both emit ultraviolet light in the wavelength range of 250 to 450 nm.
The metal halide lamp emits relatively continuous light, while it has a peak at 3,405,436 nm. The light source is selected from these two types depending on the composition of the paint and the like. When the UV optocolor clear is used as the UV curable paint, a high pressure mercury lamp of about 1 to 3 atm is suitable.

According to the present invention, a film formed of a UV-curable coating material containing substantially no solvent is cured and dried in an extremely short time by irradiation with UV rays, and therefore, after irradiation with UV rays, it should be immediately sent to the next step such as box packaging. You can

[Operation] Since the ultraviolet curable coating material used in the present invention is a coating material which does not substantially contain a solvent, it does not dissolve the marking ink.

Since it cures in an extremely short time, the curing and drying equipment becomes compact and the space required for painting becomes small. In addition, a long drying line is not required, and painting can be done on a consistent painting line.

And so on.

[Examples] Examples will be described below.

Example 1 A white base paint was applied to the surface of a general two-piece type golf ball material and dried, and then marking and clear coating were performed.

As the marking ink, one-component intaglio ink is used,
After printing this using a multi-station intaglio printing machine,
At the next station, an UV curable paint UV Opto Color Clear (manufactured by Teikoku Ink Mfg. Co., Ltd.) was intaglio printed to form a film having a thickness of 12 μm. Then, the formed film was irradiated with ultraviolet rays from a high pressure mercury lamp to be cured.

As a result, the curing was completed in a very short time of about 5 seconds, the marking portion was not damaged at all, and the obtained cured film was obtained by applying this golf ball to an iron plate at a high speed of 45 m / sec.
It was confirmed that it did not fall off even after conducting a collision experiment in which it repeatedly collides, and that it had extremely high adhesion, mechanical strength, and durability, and it protected the marked portion of the golf ball very reliably.

[Effects of the Invention] As described in detail above, according to the method for producing a golf ball of the present invention, after forming a coating film of a UV curable coating material containing substantially no solvent on at least a part of the marking portion of the golf ball surface. The present invention cures the coating film, and makes it possible to perform clear coating efficiently for protecting the marking portion with extremely excellent workability and without losing marking characters and patterns. . Moreover, since the obtained coating film is extremely excellent in adhesion, mechanical properties and durability, the appearance of the golf ball can be kept good without missing marking even after long-term use.

Claims (1)

[Claims] 1. A method for producing a golf ball, which comprises forming a coating of a UV-curable coating material containing substantially no solvent on at least a part of a marking portion on the surface of the golf ball, and then curing the coating. .