CN1210061A

CN1210061A - Moulding method for foamed body and bottom board of surfboard

Info

Publication number: CN1210061A
Application number: CN 97116842
Authority: CN
Inventors: 陈清溪
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-09-01
Filing date: 1997-09-01
Publication date: 1999-03-10

Abstract

A method for shaping the foam body and bottom plate of surfing board includes such technological steps as cutting foam body and hard plastic plate by predefined size, putting them in upper and lower moulding cavities with shaped sides, closing the cavities, locking them together, heating to joint foam body with bottom plate and filling the mould cavity, cooling and demoulding, and features simple process and high quality of product.

Description

The foaming body of surfboard and the forming method of base plate

The present invention relates to the process technology of surfboard, refer in particular to a kind of foaming body of surfboard and the integral formation method of base plate.

Surfing is very common aquatic sports already, in general seabeach or bathing beach, all can see people and take advantage of wave with surfboard by ripple, utilizes the wave of seawater, enjoys dynamic impact and takes advantage of the enjoyment of carrying.

Surfboard commonly used is to be body with ethylene vinyl acetate or polyethylene foamed plastics, the bottom surface adhesion is hard floor fixedly, Taiwan patent 264821 " structural improvement of surfboard " provides a kind of coating method glued construction with PUR, this just require sticker have firm adhesion strength, gluing must be evenly, no repellency and against weather are good between the interface.The ordinary hot melten gel can soften when temperature reaches 70 ℃ gradually, even fusing, when product in the torrid areas, or product sealing cases in nonventilated counter, or experiences all sorts of burning sun and tan by the sun, and the bonding phenomenon of peeling off can take place, and causes the flaw of product, influences result of use.

The forming step of above-mentioned surfboard commonly used is as follows: Fig. 1 represent to utilize cutter 2 with foaming body 1 with length feed mode severing stamp, take off foaming body 3 with surfboard blank; Fig. 2 represents to utilize large-scale cutter (not shown) that foaming body 3 the place ahead nose bottoms 4 are eliminated predetermined scope, make foaming body 3 the place ahead noses have shape by Bao Jianhou, controlled when being used for surfing to improve surfboard, the bottom 4 that is reamed becomes waste material and abandons; Fig. 3 represents to utilize cutter that the side of foaming body 3 is cut into the edge 6 of "＜" type by original vertical section 5, the flexibility of controlling when increasing surfing; Last Fig. 4 represents to whittle qualified foaming body 3 bottom surfaces and sticks with glue the bonding hard plastic base plate 7 of agent.The forming step of above-mentioned surfboard commonly used exists major defect to have three:

One: it is numerous and diverse that the external form of foaming body 3 whittles moulding, and the leftover bits of generation are more, causes the significant wastage of manpower man-hour and material, and environment is also brought pollution;

Its two: stick with glue the bonding hard floor of agent, be subjected to climate temperature easily and change, influence bonding intensity;

Its three: foaming body 3 wrecks the pore of original sealing after Tool in Cutting, easily absorbs seawater and organic matter, increases the weight of surfboard and is difficult to drying, and organic breeding can produce peculiar smell.

At above-mentioned defective, the inventor creates technical scheme of the present invention through studying repeatedly and testing.

Main purpose of the present invention is to provide a kind of foaming body of surfboard and the forming method of base plate, overcomes the drawback of prior art, and it is easy to reach processing, and the purpose of good quality of product.

The object of the present invention is achieved like this: a kind of foaming body of surfboard and the forming method of base plate is characterized in that this forming method comprises the following steps:

(1) foaming body and the hard plastic base plate of intercepting preliminary dimension;

(2) this foaming body and hard plastic base plate are inserted in the mould, this mould comprises upper and lower mould, be provided with the closed die cavity that butt joint has reservation shape in it, the both sides of this die cavity have the spatial accommodation that is "＜" type, this foaming body and hard plastic base plate are inserted in the die cavity of this mould, make both superimposed contacts, and these both combined thicknesses are greater than the height of this die cavity;

(3) should upper and lower mould pressurization make its butt joint sealed, the volume of the foaming body behind the matched moulds be compressed close packing, and part is squeezed in this "＜" type spatial accommodation;

(4) with upper and lower mould heating, foaming body and the fusion of hard plastic base plate are engaged, the foaming body of fusion flows to the space of this die cavity, fills whole die cavity;

(5) to this mould cool off, die sinking, taking-up finished product.

This foaming body and hard plastic base plate comprise ethylene vinyl acetate, polyethylene or its mixture; The die cavity both sides of this upper and lower mould are provided with towards connecing the gradually wide hypotenuse shape of loft; The thickness of this foaming body and both additions of hard plastic base plate is greater than the height 5-15% of die cavity; This hard plastic base areas is not more than the base plane area of this time die cavity; The outer circumference of this upper and lower mould is arranged with most holes, by this hole input steam heated or the cooling of input cold water; This heating-up temperature is 120-180 ℃, and be 3-15 minute heat time heating time.

Major advantage of the present invention is:

1, forming method of the present invention is to make foaming body 30 form molten condition with hard plastic base plate 40 to be connected, and the foaming body 30 and the hard plastic base plate 40 that utilize ethylene vinyl acetate (EVA), polyethylene (PE) or its mixture to constitute have extraordinary compatibility, so its intensity that mutually combines is good, can peeling off phenomenon; Molten adhere temperature of the present invention is 120-180 ℃, use and store in its temperature softening or fusion can not appear making, so the weatherability of finished product and service life are higher, improve the quality of products.

2, forming method of the present invention, be in the closed die cavity, to exert pressure, make the pore in the foaming body 30 be compressed into flat, when mould heats again, air in the foaming body expands again, the foaming body 30 of molten flows through the space of die cavity, fills whole die cavity, forms full complete structure, make shape, decorative pattern and the pattern one-shot forming of foaming body 30 appearances, pore is complete is present in foaming body 30 inside, can not produce to inhale seawater and become heavy, and difficult drying or organic matter are invaded the drawback that produces peculiar smell.

3, the foaming body 30 inner airs of the present invention interior pressure that expands and produced makes the protection cortex of its surface that contacts with die cavity formation higher density, the outward appearance of effectively promoting product.

Describe in detail below in conjunction with preferred embodiment and accompanying drawing.

Fig. 1 is the severing schematic diagram of forming step commonly used.

Fig. 2 cuts nose gradient schematic diagram for forming step commonly used.

Fig. 3 is the edge cutting angle schematic diagram of forming step commonly used.

Fig. 4 is the stickup hard floor schematic diagram of forming step commonly used.

Fig. 5 goes into decomposing schematic representation before the mould for of the present invention.

Fig. 6 goes into vertical section figure behind the mould for of the present invention.

Fig. 7 is the vertical section figure before the mold heated of the present invention.

Fig. 8 is the vertical section figure after the mold heated of the present invention.

Fig. 9 is a product stereogram of the present invention (broken section).

Consult Fig. 5-Fig. 9, the foaming body 30 of surfboard of the present invention and the intercept method of base plate 40, same as the prior art, so do not describe in detail.

Fig. 5 is into the decomposing schematic representation before the mould, in patrix 51 and counterdie 52, be provided with and dock upper mould cave 511 and following die cavity 521 with reservation shape, in the present embodiment, the outward appearance of the surfboard 10 of the form fit finished product of upper and lower die cavity 511,521 and designing, Fig. 9 is the stereogram of product of the present invention, its face shaping comprises the nose 11 by Bao Jianhou, both sides are the edge 12 of "＜" type, and the empennage 13 brought together of concave arc shape, the end face 14 of surfboard can design three-dimensional concave convex texture, pattern or trade mark anti-skidding or attractive in appearance; The edge 12 of "＜" type of being somebody's turn to do is last, among the following

die cavity

511 and 521, be arranged with in advance towards connecing the gradually wide hypotenuse of the loft 53 54 formed spatial accommodations that are "＜" type in both sides, as Fig. 5, shown in Figure 6, the foaming body 30 and the hard plastic base plate 40 of preliminary dimension are inserted in die

cavity

511 and 521, make both superimposed contacts, earlier hard plastic base plate 40 is inserted down the bottom surface of die cavity 521 in the present embodiment, insert foaming body 30 again, before moulding not, the thickness of

foaming body

30 and 40 both additions of hard plastic base plate is greater than last, following die

cavity

511 and 521 height are between 5-15%, look the compression of material and add the degree that die cavity is filled in thermal expansion, suitably select, the area of this hard plastic base plate 40 is good with the base plane area that is not more than down die cavity 521.

Then, patrix 51 and counterdie 52 pressurization sealing-ins is sealed, in the present embodiment that patrix 51 is fixing, counterdie 52 utilizes the upwards action of piston rod 55 of oil hydraulic cylinder, carry out the program of matched moulds locking, the volume that foaming body 30 behind the matched moulds originally exceeded is pressed downward the close packing that contracts, and has part around it and presses in hypotenuse 54 formed "＜" the type spatial accommodation of upper and lower die cavity 511,521, and the pore of foaming body 30 inside is become the flat pattern of sub-elliptical by circular compression.

Consult Fig. 7, patrix 51 and counterdie 52 are heated the scheduled time in predetermined temperature range, the outer circumference in upper and

lower mould

51 and 52 is arranged with heater 60, and generally the 61 input steams of the hole around mould are good.Heating-up temperature is between 120-180 ℃, heat time heating time is between 3-15 minute, general heating-up temperature is higher, shorten heat time heating time, the main purpose of heating is to make foaming body 30 and hard plastic base plate 40 form molten conditions and engage, make the air expansion of foaming body 30 inside produce interior the pressure, the foaming body 30 of molten is mobile toward the space of die cavitys, forms complete saturated structure.

Cool off subsequently, the steam in the hole 61 is released, the cooling water that reinjects makes foaming body 30 and hard plastic base plate 40 cooling and shapings in the mould.

Carry out die sinking at last, finished product as shown in Figure 9, foaming body 30 and fully combination of hard plastic base plate 40, and surfboard has complete face shaping.

Claims

1, the forming method of a kind of foaming body of surfboard and base plate is characterized in that this forming method comprises the following steps:

(4) with upper and lower mould heating, foaming body and the fusion of hard plastic base plate are engaged, the foaming body of fusion flows to the space of this die cavity, fills whole die cavity:

(5) to this mould cool off, die sinking, taking-up finished product.

2, forming method according to claim 1 is characterized in that: this foaming body and hard plastic base plate comprise ethylene vinyl acetate, polyethylene or its mixture.

3, forming method according to claim 1 is characterized in that: the die cavity both sides of this upper and lower mould are provided with towards connecing the gradually wide hypotenuse shape of loft.

4, forming method according to claim 1 is characterized in that: the thickness of this foaming body and both additions of hard plastic base plate is greater than the height 5-15% of die cavity.

5, forming method according to claim 1 is characterized in that: this hard plastic base areas is not more than the base plane area of this time die cavity.

6, forming method according to claim 1 is characterized in that: the outer circumference of this upper and lower mould is arranged with most holes, by this hole input steam heated or the cooling of input cold water.

7, forming method according to claim 1 is characterized in that: this heating-up temperature is 120 1 180 ℃, and be 3-15 minute heat time heating time.