JPS6331228B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a ski having a core having a honeycomb structure. By increasing the adhesion between the
This is designed to prevent buckling failure of FRP strength members and improve durability.

As a means of improving the performance characteristics of skis that use FRP as a strength component, we have made the core body a honeycomb structure to reduce the overall weight, and at the same time, we have made use of the elasticity and flexibility unique to honeycomb structure materials. Something is well known.

However, in this type of FRP ski, the core consists of a collection of honeycomb-shaped holes that open vertically, so the effective area of the end surface of the core that contributes to FRP adhesion is larger than the core. Because it is very small compared to the projected area of the ski body, there are various problems such as insufficient adhesive strength between the upper and lower ski components that are laminated on the upper and lower surfaces of the core. When a downward load is applied to the main body toward the snow surface (load: 90 kg or more), the sandwich structure of the ski bends and deforms, and as a result, compressive force is applied to the FRP strength member laminated on the upper surface of the core. This compressive force is greatest near the center of the ski body, that is, near the shoe resting area and the middle part of the rear half of the ski body where bending stress is most likely to be applied during skiing.While it is generally strong against tensile forces, it is It is said that it is weak against force
Due to the characteristics of FRP, in these parts
In many cases, FRP strength members tend to cause buckling failure when bent in the width direction of the ski, resulting in problems such as poor durability of the ski.

Therefore, as a means to compensate for the drawbacks of the conventional structure mentioned above, it is possible to make FRP thicker.
This not only increases the overall weight of the ski, but also changes the bending stiffness, which has a fundamentally negative effect on the performance characteristics of the ski.

The present invention aims to provide a manufacturing method that can eliminate the various drawbacks of conventional skis, and will be explained below based on the illustrated embodiments.

As shown in FIGS. 1 to 3, reference numeral 1 in the drawings indicates a ski body according to the present invention obtained by a manufacturing method described later. The ski body 1 has upper and lower ski upper and lower surfaces including a plurality of layers of an upper FRP strength member 3 and a lower face FRP strength member 4 on both upper and lower surfaces of a core body 2 having a honeycomb structure with honeycomb holes 2a opened in the vertical direction. It has a structure in which each member is laminated and integrated, and the area A near the center of the ski corresponding to the shoe-resting part of the core 2 (rearward from the tip of the shoe-resting part of the maximum thickness part of the core) towards 100
~ 300 mm, preferably 150 to 200 mm), an adhesive synthetic resin layer 5 is interposed between the upper surface of the range B of the rear intermediate portion of the ski body and the lower surface of the upper FRP strength member 3. ing.

That is, in order to manufacture a ski having the above-mentioned structure according to the present invention, as shown in Figs. In the area corresponding to the vicinity A of the center part of the ski body or the intermediate part B of the rear half of the upper surface part of the core body 11 of the honeycomb structure, which is made of aluminum or hardened polyester cloth impregnated with phenol resin and has honeycomb holes 11a opened in the vertical direction, For example, a high viscosity liquid synthetic resin 12 made of epoxy resin mixed with a filler such as polyurethane resin powder or wood powder in the form of a putty is applied (thickness of hanging to the honeycomb hole 11a: preferably in the range of 1 to 5 mm), and By blocking the honeycomb pores 11a with a coating film, etc.
It is applied to the peripheral wall surface of the holes of the honeycomb structural material, and then applied to the upper and lower surfaces of the core 11 using adhesive prepreg (a base material made of paper or cloth is impregnated with an uncured synthetic resin liquid for adhesive and semi-cured). 13 and 14 are attached to the full length range of the ski, the hardened FRP plates 15 and 16 constituting the upper and lower surface strength members are further laminated, placed in a desired mold 17, and hot-press molded. In this way, skis as shown in FIGS. 1 to 3 are obtained.

In addition, in this invention, when applying the high viscosity liquid synthetic resin to the upper surface of the core body, it was applied so that each honeycomb hole could be completely blocked with the coating film, but this invention There is no limit to this, and the effects of the present invention can be fully exerted even when the honeycomb pores are coated only on the end corner portions of the pores and the inner wall surface in the vicinity thereof, without completely blocking the pores.

As explained above, this invention is particularly useful in laminating and bonding the constituent members of the upper and lower ski surfaces on the upper and lower surfaces of the core body, which has a honeycomb structure with honeycomb holes, and compresses the FRP strength member when a load is applied. A high viscosity liquid synthetic resin is applied in advance to a predetermined range of the upper surface of the core body where force is applied, and each constituent member of the upper and lower surfaces of the ski, including the hardened FRP strength member, is laminated via an adhesive prepreg, Since the entire body is bonded and integrated by hot pressing, the adhesion between the core and the hardened upper FRP strength member is improved by applying a high viscosity liquid synthetic resin during hot pressing. As a result, the strength of the upper FRP strength member against the compressive force generated when a load is applied can be increased, preventing the buckling failure that occurs in the past and improving durability. It has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the ski according to the present invention, FIG. 2 is an enlarged sectional view of the main part taken along the line - FIG. 1, and FIG. 3 is an enlarged sectional view of the main part taken along the line - FIG. , FIG. 4, and FIG. 5 are explanatory diagrams showing the manufacturing process according to the present invention. 11... Core body, 11a... Beehive hole, 12...
... High viscosity liquid synthetic resin, 13, 14 ... Adhesive prepreg, 15, 16 ... Cured FRP strength member,
17... Molding mold, A, B... Application range.

Claims (1)

[Scope of Claims] 1. In laminating and bonding the constituent members of the upper and lower surfaces of the ski, including hardened FRP strength members, to the upper and lower surfaces of the core body having a honeycomb structure that opens in the vertical direction, the core body has the following features: A high viscosity liquid synthetic resin is applied in advance to a predetermined portion of the upper surface, and then adhesive prepreg is attached to both the upper and lower surfaces of the core over the entire length of the ski, and then each component of the upper and lower surfaces of the ski is laminated and heated. A manufacturing method for skis characterized by compression.