JPH04261682A - Ski plate and manufacture of the same - Google Patents

Abstract

PURPOSE:To provide a ski plate molded and set at the room temperature for a short time with the small number of molding members and man-hours. CONSTITUTION:A solid ski plate without separate upper face member, side member and reinforcing member is molded with a material having contiuous fibers as reinforcing fibers and capable of forming urethane modified acrilic resin according to RIM molding method.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ski using the RIM molding method and a method for manufacturing the same.

0002

[Prior Art] Traditionally, the main components of skis are:
As shown in FIG. 3, in addition to skis made by the laminated adhesive method, in which each member 7 for ski molding is aligned to the designed dimensions, and these are combined and laminated and bonded at once with an adhesive to form the skis, as shown in FIG.
As shown in the figure, the reinforcing layers for the upper and lower surfaces, which are preformed into the shape of a ski, the upper surface component 8, the lower surface component 9, the steel edge, and the top and tip protectors forming the protective layer are preformed with a molded metal. Some skis are manufactured using an injection molding method in which, after being placed in a mold 10 and clamped, a molding resin, such as a foamed polyurethane raw material liquid, is injected through a resin injection port. In addition, recently R
IM molding method can be seen. For example, JP-A-62-167
As disclosed in No. 577, after setting the ski body in a mold, polyurethane is cast and molded to produce a ski with an integral outer wall on the side and top surface, and as disclosed in JP-A No. 2-526.
No. 80 discloses a method in which strength members are placed on the upper and lower sides and polyurethane is cast around the core material. In addition, as a RIM molding method using continuous fibers as a reinforcing material, the present inventors have developed RI
Invented a ski formed by M-forming and a method for forming the same. The ski of the above invention can make the bending rigidity of the resin of the fiber-reinforced resin (hereinafter referred to as FRP) layer, which constitutes the reinforcing portion of the conventional ski, equal to or lower than that of conventional epoxy resin, Furthermore, by using continuous fibers as reinforcing fibers, the impact resistance can be made higher than that of epoxy resin. By doing so, traditional AB
The thickness of the protective layer on the top and side surfaces made of S can be replaced by a thick layer of resin constituting the main body, making the ABS layer on the top and side surfaces unnecessary. In addition, the manufacturing method includes coating and laminating reinforcing fibers made of continuous fibers not impregnated with resin on the core material for ski molding, and placing them at predetermined positions in a ski molding mold together with the edges and gliding surface plate. After clamping the mold, a low-viscosity monomer or prepolymer capable of producing crosslinked polyesteramide, polydicyclopentadiene, or polyurethane is injected through a molding resin injection port and then cured.

0003

SUMMARY OF THE INVENTION The above-mentioned conventional skis and methods of manufacturing the same have the following drawbacks. In other words, in the lamination bonding method, it is possible to select from a wide variety of materials for each member 7 that makes up the ski, and there is freedom in various designs. It is widely used because of the advantage of being able to create combinations, but it requires a large number of molding parts and precise dimensional tolerances, which requires a large number of steps and is time-consuming. There were problems such as a long curing time and high cost.

[0004] Furthermore, in the injection molding method for polyurethane foam resin, etc., it is necessary to set the upper and lower surface components 8 and 9, which are aligned in advance into the shape of a ski, into the mold 10 for molding. When FRP members are used for
Epoxy resin or unsaturated polyester resin, which is the matrix resin of P, is brittle and easy to apply as a surface material, so a plate made of ABS resin or the like was required as a protective layer on the surface. Further, even when an aluminum alloy plate is used as the upper reinforcing layer, an ABS resin plate is often provided as a protective layer on the surface. As for the sides, the skin layer of the polyurethane foam core material is often exposed as is or side panels made of ABS resin are installed, but in cases where it is exposed, it is necessary to provide a top edge to protect the fragile polyurethane layer. . Also, since it is an injection molding method using foamed resin, the molding time can be shortened, but in order to change the properties such as strength and rigidity of the ski, it is necessary to
The type and thickness of the material of the reinforcing layer or the thickness of the core material had to be changed, which necessitated changing the mold, so there was not much freedom in design.

[0005] JP-A-62-167577 and JP-A-2-5
In the RIM molding method using polyurethane found in No. 2680, the molding temperature is relatively low at 40 to 60° C., which is good, but since isocyanate is used, it is necessary to isolate it from air and handling is extremely difficult. Furthermore, the cured resin portion does not serve as a strength member, and as in the past, it was necessary to mold a strength member in advance and incorporate it during molding. In addition, in the case of RIM molding using a monomer that can generate polydicyclopentadiene as a raw material, the polymerization catalyst is alkaline, so when carbon graphite fiber is used as the reinforcing fiber, a neutralization reaction occurs due to the acid treatment of the surface. There was a drawback that polymerization did not proceed due to the following. For this purpose, attempts have been made to develop another surface treatment method for bonding the surface of carbon graphite fibers, but this has not yet been developed. Furthermore, the raw material temperature is as high as 150℃ and 200℃,
It had poor workability and had the same problems as the crosslinked polyesteramide resin described below. In the case of materials that can produce crosslinked polyesteramide, the temperature of the material is as high as about 140°C;
The reaction temperature becomes higher than that. Because of this high curing temperature, there are drawbacks such as, for example, only some ultra-high molecular weight polyethylene can be used as the polyethylene sliding surface, and the materials that can be used for the sliding surface and other attached members are limited. In view of these conventional drawbacks, the present invention aims to select a molding material that requires a small number of molded parts and molding steps, does not adversely affect the installed parts, has good adhesive properties, and cures in a short time at room temperature. It is an object of the present invention to provide a ski and a method for manufacturing the same that allows a high degree of freedom in designing the characteristics of the ski.

[0006]

[Means for Solving the Problems] The present invention provides a ski in which a portion including a top plate and a side plate is molded from a single fiber-reinforced resin. This ski is characterized by being molded by RIM molding using a material capable of producing modified acrylic resin. As the reinforcing fibers used in the present invention, reinforcing fibers commonly used in FRP molded products can be used. The content of reinforcing fibers in the molded product should be 40 to 40 to satisfy the properties such as strength and rigidity for skis.
Preferably it is 70% by weight. The ski of the present invention may not only consist of a reinforcing fiber layer made of continuous fibers, but also may include a core material. When a core material is interposed, a hollow core material can be used in addition to a solid core material such as a foam. In addition, as a manufacturing method for the above-mentioned skis, continuous fibers or reinforcing fibers such as woven fabrics, braids, rovings, etc. made of the continuous fibers are placed in a mold for forming skis together with edges and gliding surface materials, and then closed. A low-viscosity monomer or prepolymer is mixed and injected into a mold, impregnating the reinforcing fibers, and curing the adhesive of each component at the same time.In the process of integrally molding without providing a top plate or side plate, the resin hardens. A method for manufacturing skis, characterized in that the material is a urethane-modified acrylic resin. In the above manufacturing method, a solid or hollow core material may be used, and reinforcing fibers may be coated and laminated on the core material for molding.

[0007]

[Function] Since the ski of the present invention uses continuous fibers as reinforcing fibers, unlike conventional skis, the top and side materials can be formed separately in advance as a protective layer and then laminated and adhesively molded. Since the process of incorporating members such as reinforcing materials is not required, the number of structural members can be reduced and the manufacturing process can be simplified. In addition, it is possible to change the type and amount of reinforcing fibers as appropriate, or when forming by covering and laminating reinforcing fibers on the core material.
By selecting the material for the core material, it is possible to create a hollow structure, which expands the design range in terms of rigidity, weight, strength, etc., and allows skis with desired characteristics to be obtained economically. 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 shape of the ski is improved. According to the method of the present invention, the raw material temperature is 25
Since it can be molded at a low temperature of ~30℃ and the mold temperature is between room temperature and around 50℃, there is no need to worry about the sliding surface material and other components being deformed by the heat during molding, so the range of material selection is limited. Not done.

[0008]

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a ski 1 of the present invention has a core material 3 made of foam, for example, carbon fiber, as shown in FIG. A reinforcing fiber 4 made of continuous fibers such as glass fiber or Kevlar fiber is coated and laminated, and a sliding surface material 5 and a bottom edge 6 are formed in a mold 2.
After placing the inside of the ski board 1, materials such as monomers and prepolymers capable of producing urethane-modified acrylic resin are injected from the resin injection port of the mold to form an integrated ski board 1 that does not have a separate top material, side material, or reinforcing member. I got it. In addition, as the core material 3, a foam such as urethane or epoxy resin can be used as is, but the surface of the foam may be covered with a tube of nylon, cellophane, polyethylene, etc., or coated with resin. to form a resin layer,
It is possible to prevent the molding material from penetrating into the foam. In addition, hollow plastic etc. can be used. As for the form of the reinforcing fibers, in addition to winding continuous fibers, woven fabrics, biaxial or triaxial braids, rovings, etc. can be used.

[0009]

[Effects of the Invention] Since the present invention has the structure and manufacturing method as explained above, it achieves the following effects. That is, since the ski 1 of the present invention is RIM molded using a low-viscosity monomer or prepolymer that can produce a urethane-modified acrylic resin, continuous fibers or woven fabrics, braids, rovings, etc. made of continuous fibers may be used as reinforcing fibers. Also, it wets well with the fibers, so it is well impregnated into the fibers, and there is less disturbance of the reinforcing fibers when injecting the material, and it spreads to every corner of the mold and goes around easily, making it easier to mold. The surface condition after completion is good and the product has a beautiful appearance, and the post-processing process is simple and requires no effort, so it can be manufactured at low cost. Therefore, the top surface,
The entire ski, including the sides, can be molded in one piece without any seams, resulting in a ski with good impact resistance. According to the method of the present invention, the temperature during ski molding ranges from room temperature to 50°C.
Because it requires only a low
Since there is less molding distortion and this leads to improved ski durability, the degree of freedom in selecting the molding material, that is, designing the characteristics of the ski, etc. is increased.

[Brief explanation of the drawing]

FIG. 1 is an external view of the ski of the present invention.

FIG. 2 is an explanatory diagram of the ski molding method of the present invention.

FIG. 3 is an explanatory diagram of a conventional molding method.

FIG. 4 is an explanatory diagram of a conventional molding method.

[Explanation of the code] 1 Skis 2 Mold 3 Core material 4 Reinforcement fiber 5 Sliding surface material 6 Bottom edge 7 Components 8 Top surface component 9 Bottom component 10 Mold

Claims (3)

[Claims] Claim 1: A ski board in which a portion including a top plate and a side plate is molded from a single fiber-reinforced resin, the fiber-reinforced resin being a material capable of producing urethane-modified acrylic resin using continuous fibers as reinforcing fibers, A ski characterized by being molded by the RIM molding method. 2. The ski according to claim 1, further comprising a hollow portion inside the ski. 3. Continuous fibers or reinforcing fibers such as woven fabrics, braids, and rovings made of the continuous fibers are used as edges,
It is placed in a ski molding mold together with the running surface material, and a material capable of producing urethane-modified acrylic resin is injected into the closed mold, impregnating the reinforcing fibers and curing the adhesive between each component at the same time. , a method for manufacturing skis, characterized in that they are integrally molded without providing a top plate and a side plate.