JPH0783787B2 - Ski and method for manufacturing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ski and a manufacturing method thereof by a RIM molding method.

(Prior Art) Conventionally, as a main manufacturing method of skis, as shown in FIG. 3, each member 7 for forming skis is arranged in a dimension as designed, and these are combined and laminated at once with an adhesive. There is a laminated adhesion molding method in which molding is performed by bonding.

Further, as shown in FIG. 4, members 9 and 10 for forming upper and lower reinforcing layers and protective layers, which are preliminarily molded in a ski shape, a steel edge 11, and a protector for the top and the tip are preliminarily molded by a mold 12. There is an injection molding method in which a resin for molding, for example, a foamed polyurethane raw material liquid is injected and injected from a resin injection port after being placed inside the mold and clamped.

In addition, recently, skis with good ski characteristics have been developed as a method that can be economically produced by simple means.
A molding method can be seen.

For example, as disclosed in JP-A-62-167577,
After the ski body is set in the mold, polyurethane is cast, and the ski member has an outer wall with an integral side and upper surface. There is a method of casting polyurethane around the core by placing it on the lower surface.

In addition, as a RIM molding method using continuous fibers as a reinforcing material,
RIM with monomeric or prepolymeric materials capable of forming crosslinked polyesteramides or polydicyclopentadiene
There are skis formed by molding and a method for manufacturing the skis.

The ski of the above invention can make the flexural modulus of the resin of the resin (hereinafter referred to as FRP) layer reinforced with the fiber constituting the reinforcing portion of the conventional ski to be equal to or less than that of the conventional epoxy resin. . Furthermore, impact resistance can be made larger than that of epoxy resin by using continuous fibers as reinforcing fibers, so the thickness of the protective layer on the top and side surfaces of conventional ABS is It can be replaced by a thick layer, and the ABS resin layers on the top and sides are unnecessary.

Further, as its manufacturing method, a reinforcing fiber made of continuous fibers which is not impregnated with resin is wound on a core material for ski molding by covering and winding, and an edge and a sliding surface plate are arranged at a predetermined position in a ski molding die, There is known a method of molding by injecting and curing a low-viscosity monomer or prepolymer capable of forming crosslinked polyesteramide or polydicyclopentadiene from a molding resin injection port after mold clamping.

(Problems to be Solved by the Invention) The conventional ski and the manufacturing method thereof have the following drawbacks.

That is, in the laminated adhesion method, various materials for each member 7 constituting the ski can be selected and various designs are free, that is, any combination of materials in order to bring out the performance required by the product. It is widely used due to the advantage that it can also be used for molding, but it requires a large number of molding members, requires precise dimensional tolerances, and therefore requires many steps and labor, and also cures the adhesive resin. There is a problem that the time is long and the cost is high.

Also, in the injection molding method of foamed polyurethane resin or the like, the upper and lower surface constituting members 9 and 10, which are previously arranged in a ski shape,
Had to be set in the mold 12 for molding, but when a member made of FRP was used for the reinforcing layer on the upper surface, the epoxy resin or unsaturated polyester resin that was the matrix resin of FRP was fragile as the surface material. Since it is easily chipped, a resin plate such as ABS was required as a protective layer on the surface. Even when an aluminum alloy plate is used for the reinforcing layer on the top surface,
In many cases, an ABS resin plate was provided. For the side,
The skin layer of the polyurethane foam core material 13 is exposed as it is or a side plate of an ABS resin plate is often provided, but when exposed, it was necessary to provide a top edge to protect the brittle polyurethane layer. Also, the molding time can be shortened because of the injection molding method using foamed resin, but the strength of the ski is
In order to change the characteristics such as rigidity, it is necessary to change the type and thickness of the material of the reinforcing layer or the thickness of the core material. There weren't many.

In the RIM molding method using polyurethane, which is found in JP-A-62-167577 and JP-A-2-52680, the cured resin portion does not become a strength member, and it is necessary to form a strength member in advance as in the past and incorporate it during molding. was there.

Further, in the case of RIM molding using a monomer capable of forming polydicyclopentadiene as a raw material, when the carbon graphite fiber is used as the reinforcing fiber because the polymerization catalyst is alkaline, a neutralization reaction occurs due to the acid treatment of the surface. However, there was a drawback that polymerization did not proceed. For this reason, an attempt has been made to develop another surface treatment method for the adhesion treatment of the surface of carbon graphite fiber, but it has not been developed yet. Further, since the raw material temperature was as high as 150 ° C. and 200 ° C., workability was poor, and there were the same problems as in the crosslinked polyesteramide described below.

In the case of a raw material capable of forming a crosslinked polyesteramide, the temperature of the raw material is as high as about 140 ° C., and the reaction temperature becomes higher than that. Due to the high curing temperature, there have been drawbacks such as the fact that only a part of ultra-high molecular weight polyethylene can be used as the polyethylene sliding surface, and the materials usable for the sliding surface and other auxiliary members are limited.

Therefore, in view of these conventional drawbacks, the present invention has a small number of molding members, a small number of molding steps, does not adversely affect the installation member, has good adhesiveness, selects a molding material, and has a design related to the characteristics of the ski, etc. An object of the present invention is to provide a ski having a large degree of freedom and a manufacturing method thereof.

(Means for Solving the Problems) The present invention is a ski having a portion including a top plate and a side plate molded from a single fiber-reinforced resin, wherein the fiber-reinforced resin comprises continuous fibers as reinforcing fibers and a monomer. Or in skis molded by RIM molding of prepolymer, the monomer or prepolymer is polyurethane resin,
A ski, which is a material capable of producing a polyurea resin, a polyurethane / polyurea mixed resin, and a polyurethane / unsaturated polyester mixed resin.

As the reinforcing fiber used in the present invention, the reinforcing fiber used in ordinary FRP molded articles can be used. The content of the reinforcing fibers contained in the molded product is preferably 40 to 70% by weight in order to satisfy characteristics such as strength and rigidity of the ski.

The ski of the present invention may have a core material in addition to the structure having only the reinforcing fiber layer made of continuous fibers.

When interposing a core material, a hollow core material can be used in addition to a solid core material such as foam.

Suitable resins for the molding method according to the present invention include polyethylene resins obtained from ether polyols and isocyanates, polyurea resins obtained from amines and isocyanates, urethane / unsaturated polyesters obtained from isocyanates containing unsaturated polyester polyols and peroxides. Examples include mixed resins. The resin may be used by adding a catalyst, a stabilizer and the like which meet the respective requirements.

Further, as the method for manufacturing the ski, the continuous fiber or a woven fabric made of the continuous fiber, a reinforcing fiber such as a blade or a roving is placed in a mold for ski molding together with an edge and a sliding surface material and closed. In the process of mixing and injecting a low-viscosity monomer or prepolymer into the mold, simultaneously impregnating the reinforcing fibers and adhesively curing each member, and molding them integrally without providing the top plate and side plate. A method for manufacturing a ski, wherein the cured product is a thermosetting non-foamed polyurethane resin, polyurea resin, polyurethane / polyurea mixed resin, polyurethane / unsaturated polyester mixed resin.

In the manufacturing method of the present invention, a reinforcing fiber may be coated and wound around a solid or hollow core material to be molded.

(Operation) Since the ski of the present invention uses continuous fibers as reinforcing fibers, it is possible to separately form the upper surface material and the side material as a protective layer in advance and perform laminated adhesion molding like a conventional ski. Since a step of incorporating a member such as a reinforcing material is not required, the number of constituent members can be reduced and the manufacturing process can be simplified.

Further, when the type, amount, etc. of the reinforcing fibers are appropriately changed, or when the reinforcing fibers are coated and wound around the core material,
By selecting the material of the core material, it is possible to make it a hollow structure or a solid structure of foam, etc., so the range of design such as rigidity, weight, strength, etc. can be expanded, and skis with the desired characteristics are economical Can be obtained.

In addition, since the number of molded parts is small and the molding process is simple, the degree of freedom in designing the cross-sectional outer shape of the ski is improved.

According to the method of the present invention, the raw material temperature is as low as 25 to 30 ° C., and the mold temperature is also low at 60 to 80 ° C., so that the sliding surface material and other constituent members are deformed by the heat during molding. Since there is no worry, the selection range of materials is not limited.

(Example) An example of the present invention will be described with reference to the drawings. As shown in FIG. 1, a ski 1 made of a monomer and a prepolymer material of the present invention has a non-foamed polyurethane resin as a resin and a reinforcing fiber as a resin. Molded with a RIM molding machine using carbon fiber and glass fiber.

The isocyanate and amine catalysts were used as liquid A, and the ether polyol was used as liquid B, and the liquid temperature was kept at 30 ° C. The viscosity at this time is about 130 cps for solution A and about 100-150 cps for solution B.
Met.

Inject the liquid A and liquid B into the molding die 2 heated to about 60 ° C,
Molded by reaction curing.

As shown in FIG. 2, in the ski 1, the core material 3 made of, for example, a foam is coated with a reinforcing fiber 4 made of continuous fibers such as carbon fiber, glass fiber, and Kevlar fiber, and the sliding surface material 5 is used. After arranging the bottom edge 6 in the molding die 2, a monomer or a prepolymer is injected from a resin injection port of the die to obtain an integrated ski 1 having no separate top material, side material, and reinforcing member. be able to. In addition, as the core material 3, an alloy having a melting point of 120 ° C. or less that can be melted after curing and molding, hollow plastic, or the like can be used. As the form of the reinforcing fiber, in addition to winding continuous fiber, woven fabric, 2,3 axis braid,
Roving etc. can be used.

(Effect) The present invention has the following effects because of the configuration and manufacturing method as described above.

That is, the ski 1 of the present invention is a ski made of a monomer or prepolymer material, and the reinforcing fiber 4 is made of continuous fibers or woven fabric made of continuous fibers, roving, blades, or the like, or an upper surface thereof, Since the entire ski including the side surface is integrally molded without a seam, the ski has good impact resistance.

Further, since the continuous fiber is used as the reinforcing fiber, the upper surface material, the side surface material, and other strength members are unnecessary, so that the number of constituent members is reduced and the degree of freedom in designing the cross-sectional outer shape of the ski is increased.

Further, since a monomer having a low viscosity of 400 CPS or less and a prepolymer are used, the continuous fibers or a woven fabric made of continuous fibers, a braid, a roving, etc. are well wetted with the fibers as the reinforcing fibers. Impregnation into the interior is good, and the disorder of the reinforcing fibers at the time of pouring the material is small, it spreads to every corner of the mold and it is easy to wrap around, so it is easy to mold, the surface condition after molding is good and it is aesthetic and Since it is a simple process, it can be manufactured at low cost.

According to the method of the present invention, the temperature during ski formation is 60-80.
Since it can be kept as low as about ℃, it does not adversely affect the sliding surface material and other molding members. It also contributes to molding distortion and less improvement of the ski's durability when used at low temperatures. The degree of freedom in designing the selection of, that is, the characteristics of the ski is increased.

[Brief description of drawings]

FIG. 1 is a perspective view of the ski of the present invention, FIG. 2 is a manufacturing explanatory view of the ski of the present invention, and FIGS. 3 to 4 are manufacturing explanatory views of a conventional ski. 1: Ski, 2: Mold, 3: Core material, 4: Reinforcing fiber, 5: Sliding surface material, 6: Bottom edge, 7: Member, 9: Top component, 10: Bottom component, 11: Edge, 12: mold, 13: foam core material.

Claims (7)

[Claims] 1. A ski having a portion including a top plate and a side plate molded from a single fiber reinforced resin, wherein the fiber reinforced resin is molded by RIM molding of a monomer or a prepolymer using continuous fibers as reinforcing fibers. On skis,
A ski, wherein the monomer or prepolymer is a material capable of producing a polyurethane resin, a polyurea resin, a polyurethane / polyurea mixed resin, or a polyurethane / unsaturated polyester mixed resin. 2. The ski according to claim 1, wherein the ski has a hollow portion inside. 3. A continuous fiber or a woven fabric made of the continuous fiber, a braiding fiber, a reinforcing fiber such as a roving, etc. are appropriately wound,
Placed in a ski mold for molding together with edges and sliding surfaces, inject a monomer or prepolymer into a closed mold, impregnate reinforcing fibers, and perform adhesive curing of each member at the same time. A method for manufacturing a ski, wherein the resin cured product is a thermosetting non-foamed polyurethane resin in the step of integrally molding without providing a side plate. 4. The method for manufacturing a ski, wherein the cured resin is a polyurea resin.
A method for manufacturing the described ski. 5. The method of manufacturing a ski according to claim 3, wherein the resin cured product is a polyurethane / polyurea mixed resin in the method of manufacturing a ski. 6. The method for manufacturing a ski as claimed in claim 3, wherein the cured resin is a polyurethane / unsaturated polyester mixed resin. 7. The ski manufacturing method according to claim 3, wherein the core material is hollow in the ski manufacturing method.