JPH11129351A - Manufacture of surfboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a surfboard fast without breaking down a material, not necessitating cutting out. SOLUTION: According to this method for manufacturing a surfboard, first a first mold 40 is provided and a plate 33 is put in a die hole 43 of the first mold 40. The plate 33 in the first mold 40 is pressed while it is hot and the plate 33 is taken out, foamed and expanded, so that a semi-finished product be molded. Next, a second mold 2 of which the die hole has larger dimensions than ones of the semi-finished product is provided. The semi-finished product in the second mold is pressed while it is hot, and is foamed and filled therein. Thereby the surfboard is molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a surf board.

[0002]

2. Description of the Related Art A conventional surf board is manufactured from an ethylene vinyl copolymer (hereinafter referred to as EVA). The manufacturing method is to form a plate by foaming the material, cut,
This is a method to cut corners.

[0003]

However, not only does it take much time to cut, but also when cutting foamed materials,
Destroys VA and soaks in water, often producing harmful substances, causing off-flavors. Therefore, a main object of the present invention is to provide a method for manufacturing a surf board quickly without breaking the material without cutting.

[0004]

According to a first aspect of the present invention, there is provided a method for manufacturing a surf board according to the present invention, wherein a first mold is provided, and a die of the first mold is provided. Put the plate in the hole. While hot, the plate in the first mold is pressed, the plate is removed and foamed and expanded to form a semi-finished product.

Next, a second mold is provided, and a semi-finished product is put into a die hole of the second mold. The size of the die hole is larger than the size of the semi-finished product. Press the semi-finished product in the second mold while hot, foam the semi-finished product, fill the space of the die hole, and form the surf board.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The method of manufacturing the surf board according to the present embodiment is as shown in FIGS. As shown in FIG. 5, the finished surf board 20 includes a tapered side 22, a tapered tip 21, a bend, a tapered tail end 23, and a flat base 24.

First, EVA or polyethylene (PE)
Then, a foam material plate 30 for forming the surf board 20 is produced. After cutting the foam material plate 30 into several plates 33, the remaining material 35 can be pressed once more flat to reproduce the foam material plate 30, so that there is no waste of material. As shown in FIG. 2, the first mold 40 includes a mold upper part 41 and a mold lower part 42, each of which has a plate 33.
Is provided with a die hole 43 for inserting the hole. The lower mold part 42 is fastened with a base 44. Two or more tightening units 45 are passed through the mounting ears 47 and 48 of the upper mold part 41 and the lower mold part 42, and the upper mold part 41 and the lower mold part 42 are tightened.
The tightening unit 45 employs a bolt, hydraulic or pneumatic rod. In order to heat the first mold 40 and the plate 33, a heating medium or hot water is introduced through a plurality of passages 46 provided in the mold upper part 41 and the mold lower part 42. The mold is 1
Heat to 50-170 ° C. for 30-40 minutes and increase or decrease temperature and time as needed. As shown in FIG. 3, when the plate 33 is pressed while it is hot, the plate 33 expands by a factor of 6 to 10 when it is taken out and becomes a semi-finished product 50. The semi-finished product 50 is heated and foamed to form bubbles inside. At that time, the semi-finished product 50 does not completely foam.

As shown in FIGS. 3 and 4, the second mold 6
0 also includes a mold upper part 61 and a mold lower part 62, and has die holes 611 and 621 for receiving the semi-finished product 50, respectively. The die holes 611 and 621 are provided with a tapered tip 21, a tapered side 22, and a sloped side 64 corresponding to the tapered tail 23 of the surf board 20. Upper mold 61 and lower mold 6
2 and a contact surface 63 is formed. The die hole 611,
The volume of 621 is 2-3 times larger than the volume of the semi-finished product 50, so that the semi-finished product 50 can be expanded up to 2-3 times. In order to heat the second mold 60 and the semi-finished product 50, the mold upper part 61
A heating medium or hot water is supplied through a plurality of passages 65 provided in the mold lower part 62. The mold is heated to 160-180 ° C. for about 10-15 minutes, and the temperature and time are increased or decreased as necessary. The two or more tightening units 80 are connected to the upper part 61 of the mold.
Then, the mold is passed through the mounting ears 81 and 82 of the mold lower part 62, and the mold upper part 61 and the mold lower part 62 are tightened. The tightening unit 80 employs bolts, hydraulic or pneumatic rods. As a result, the preform 50 pressed while hot expands by a factor of 2 to 3 and fills the space of the die holes 611 and 621. Further, cold water is put into the passage to cool the second mold 60 and the surf board 20. That is, since cutting is not required after the surf board 20 is formed by foam molding, there is no destruction of the material and no phenomenon of unpleasant taste.

[Brief description of the drawings]

FIG. 1 is a perspective view of a plate material for forming a surf board according to an embodiment of the present invention.

FIG. 2 is an exploded view of a first mold according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a state in which a semifinished product is placed in a second mold according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a state in which a semi-finished product is foamed and filled in a second mold according to an embodiment of the present invention.

FIG. 5 is a perspective view of a surf board manufactured according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 20 surf board 33 plate 40 first mold 43, 611, 621 die hole 50 semi-finished product 60 second mold

Claims (5)

[Claims] A step of inserting a plate into a die hole formed in a first mold; a step of heating and pushing the plate in the first mold; and a step of heating the heated plate with the first mold. Removing from the mold, foaming and expanding to form a semi-finished product; placing the semi-finished product in a die hole larger than the semi-finished product formed in the second mold; Heating the semi-finished product and pressing it; foaming the heated semi-finished product in the second mold; filling the semi-finished product with the foamed semi-finished product in the die hole of the second mold; Forming a surf board. 2. The method according to claim 1, further comprising the step of processing the periphery of the taper corresponding to the side of the taper of the surf board, the tip of the taper, and the tail of the taper with the die hole of the second mold. Item 4. A method for producing a surf board according to Item 1. 3. Heating the first mold, the second mold, the plate, and the semi-finished product through a plurality of passages formed inside the first mold and the second mold. 2. The method according to claim 1, further comprising the step of:
A method for producing the surf board according to the above. 4. The first mold is heated to 150 to 170 ° C. for about 30 to 40 minutes, and the second mold is heated to 160 to 180 ° C.
And heating the mixture for about 10 to 15 minutes.
A method for producing the surf board according to the above. 5. The dimension of the semi-finished product is 6
The method for manufacturing a surf board according to claim 1, wherein the size of the surf board is about 10 to 10 times, and the size of the surf board is two to three times the dimension of the semi-finished product.