JPS58118779A - Production of water slide board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for manufacturing all waterplane boards, such as sailboards and surfboards.

The conventional method for manufacturing the entire board is to mold foamed polyurethane (urethane foam), cover its entire surface with a glass fiber layer of an appropriate thickness, and then impregnate it with a suitable synthetic resin and harden it. to complete the board body.

This method involves quite tedious work.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new method for easily manufacturing a surface sliding board.

According to the present invention, a material to be a surface layer is placed over almost the entire surface of a mold cavity, and then a foamable material is injected into the mold cavity and foamed, and the foamed material and the surface layer material are bonded together. A characteristic method can be obtained.

By doing so, the manufacturing process for the board body can be significantly shortened. According to the invention, various other advantages can be obtained, which will become apparent from the following detailed description with reference to the accompanying drawings.

Referring to Figures 1 and 2, upper and lower molds 1 and 2 are shown, the upper mold 1 having a recess 3 corresponding to the deck part of the board body to be manufactured, and the lower mold 2 has a recess 4 which corresponds to the bottom of the board body.

The recesses 3 and 4 of each mold 1 and 2 are filled with a material that is to become the surface layer of the board body, such as glass fiber or its fabric.
, 6 over almost the entire surface. At this time, it is preferable to adhere the material using an adhesive whose properties are compatible with the synthetic resin that will be impregnated into this surface layer in a subsequent step. The purpose of this is to prevent the surface layer material from moving or peeling off during operations such as mold matching, so point adhesion may be used.

After application of surface layer material, i.e. glass fiber.

The upper and lower molds 1 and 2 are brought together as shown in FIG. 3 to form a mold cavity 7. This mold cavity 7 is covered over almost its entire surface with glass fiber or its fabric, into which a foamable material, for example a foamable polyurethane liquid, is injected from a nozzle 9 through a sprue 8 in the upper mold 1. When the polyurethane foams, it penetrates the glass fibers, creating a fully bonded foam with glass fibers covering the entire surface. The state after release from the mold is shown in FIG.

The glass fibers are then impregnated with a suitable synthetic resin to complete the board body. The impregnation method may be various known methods,
Examples include the no-no-dry-up method, the resin injection method, and the press molding method.

When injecting foamable material into the mold cavity, the cross-foaming method is better than the normal foaming method because the urethane foam impregnates the glass fibers less (and the later coating with the synthetic resin is easier). ,preferable.

In addition, when attaching the glass fiber 5 to the recess 3 of one of the molds, in the illustrated embodiment, a part of the glass fiber 5 is made to protrude from the edge of the recess, and when the molds are completely aligned, the fifth As shown in the figure, if the glass fibers 6 applied to the recesses 4 of the other mold, that is, the lower mold 2, are overlapped with the edges, the seams of the completed board body can be easily processed.

As is clear from the above, the present invention can shorten the process of manufacturing the main body of a hydroplane board.When injecting the foam material, air escapes through the glass fibers, so no air bubbles remain. The density of the surface of the foam becomes more attractive, and the impregnation of the foam into the synthetic resin during coating with synthetic resin is reduced, making it possible to reduce the weight of the board and improving the fluidity of the coated synthetic resin on the surface of the foam. , there is no occurrence of dents, etc., and there is no variation in quality.Furthermore, the foamable material can be made into a material with a relatively low specific gravity,
This also leads to a reduction in the weight of the board itself. Furthermore, since the adhesion between the glass fiber and the foam is uniform, the synthetic resin coating process is easy. Furthermore, since the bond between the glass fiber and the foam is reliable, the foam is less likely to collapse when the foaming polyurethane liquid is injected using the resin injection method, and there is no need to pay much attention to the injection pressure. moreover,
The method of the invention does not require any mold release agent.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a lower mold used to carry out the present invention, Fig. 2 is a sectional view showing a similar upper mold, Fig. 3
, FIG. 2 is a cross-sectional view showing the state in which the upper and lower molds are combined and foamed material is injected, FIG. 4 is a cross-sectional view of the board body manufactured by the method of the present invention, and FIG. (This is an enlarged sectional view showing a part of the combined mold. 1.2...mold, 3,4...indentation,
5, 6...Glass fiber, 7...Mold cavity, 8...Sprue, 9...Nozzle agent Patent attorney Akira Kono (7) Drawings Engraving (no change in content) Figure 1 Figure 2 Figure 3 Figure 4 For procedural amendments (voluntary) April 28, 1982, special notice of the name of the invention, method for notifying Vj3 of water sliding board, amendment. (9) Related information Patent applicant name Higashi Suzuki, agent 107 ■ Address 2-2-21 Akasaka, Minato-ku, Tokyo Specification 1 (T, Eve buoyancy (contents subject to change)) Drawings and power of attorney (1 copy) Contents of the amendments are as shown in the attached sheet.

Claims (1)

[Claims] (1) A method for manufacturing a main body of a water skiing board consisting of a foam and a surface layer covering the same, in which a material to be the surface layer is placed over almost the entire surface of a mold cavity, and then, A method characterized in that the foamable material is injected into a mold cavity and foamed, and the foamed material and the surface layer material are bonded together. It is formed by depressions formed on the mating surfaces of the two mold parts.Glass fiber or its fabric is pasted on almost the entire surface of these depressions, and then the molds are brought together to form a mold caviar eye. A method characterized by completely injecting the foaming polyurethane liquid into the cavity and causing foaming. (3) In the method according to claim 2, the glass fiber or its fabric affixed to the recess of one mold is A method characterized in that the overhanging portion is made to overhang from the edge of the recess so that when the molds are put together, this overhanging portion overlaps with the glass fiber or its fabric affixed to the recess of the other mold.