WO2019225370A1

WO2019225370A1 - Surfboard and method for manufacturing surfboard

Info

Publication number: WO2019225370A1
Application number: PCT/JP2019/018891
Authority: WO
Inventors: 尚彦新藤
Original assignee: SHINDOH Naohiko
Priority date: 2018-05-21
Filing date: 2019-05-13
Publication date: 2019-11-28
Also published as: JP7068447B2; JPWO2019225370A1

Abstract

The present invention provides a surfboard that can offer sufficient weight reduction, has high adhesion between a frame and an outer plate, and also has excellent durability, and a method for manufacturing the surfboard. A surfboard 10 according to the present invention comprises: a frame 1 configured by combining a plurality of vertical bones 11a and 11b arranged in a longitudinal direction of the surfboard 10 and a plurality of transverse bones 12 arranged in a direction intersecting with the vertical bones; an inner portion 2 that is formed so as to fill a space 13 formed by the vertical bones 11a and 11b and the transverse bones 12; and an outer plate 3 that is formed so as to cover the frame 1 and a surface of the inner portion 2, wherein the outer plate 3 includes, starting from the frame 1 side, a paper layer 31 containing paper and resin, and a reinforcing fiber layer 32 containing fiber and resin.

Description

Surfboard and surfboard manufacturing method

The present invention relates to a surfboard and a method for manufacturing the surfboard.

Surfboards are required to be lightweight and have high durability that is not damaged even when they are caught in a wave.
In general, a surfboard has a configuration in which polyurethane foam is used as a core material for weight reduction, and the core material is covered with glass fiber, plastic, or the like in order to improve durability.

In recent years, in order to further reduce the weight, a surfboard having a skeleton (core) having a plurality of cavities is known (Patent Document 1).

Special Table 2009-500211

However, in the surfboard of Patent Document 1, the resin flows into the cavity, and it is difficult to achieve a sufficient weight. Further, the bondability between the skeleton and the outer plate was low, and the durability was not sufficient.

Therefore, an object of the present invention is to provide a surfboard that can achieve a sufficient weight reduction, has high adhesion between the skeleton and the outer plate, and has excellent durability, and a method for manufacturing the same.

The surfboard according to the present invention is a skeleton composed of a combination of a plurality of vertical bones arranged in the longitudinal direction of the surfboard and a plurality of horizontal bones arranged in a direction intersecting the vertical bones,
A meat part formed so as to fill at least a part of a space formed by the vertical bone and the horizontal bone;
An outer plate formed so as to cover the surface of the skeleton and the meat part,
The outer plate includes, in order from the skeleton side, a paper layer containing paper and resin, and a reinforcing fiber layer containing fibers and resin.

The surfboard manufacturing method of the present invention also includes a skeleton assembly that forms a skeleton by combining a plurality of vertical bones arranged in the longitudinal direction of the surfboard and a plurality of horizontal bones arranged in a direction intersecting the vertical bones. Process,
A meat part forming step of forming a meat part in a part of a space formed by the vertical bone and the horizontal bone;
A paper pasting step of pasting paper so as to cover the surface of the skeleton and the meat part;
A fiber placing step of placing fibers on the pasted paper;
A resin impregnation step of applying a resin on the fiber and impregnating the fiber and the paper with the resin;
And a curing step for curing the impregnated resin.

According to the present invention, it is possible to provide a surfboard that can achieve a sufficient weight reduction, has high adhesion between the skeleton and the outer plate, and has excellent durability, and a method for manufacturing the same.

It is a top view which shows an example of the upper surface (a) and lower surface (b) of the surfboard of this invention. It is a perspective view which shows the frame | skeleton with which the surfboard of FIG. 1 is provided. It is a top view which shows an example of the vertical bone and horizontal bone which comprise the frame | skeleton of FIG. FIG. 3 is a partial plan view illustrating a space included in the skeleton of FIG. 2 and a state in which the meat constituent material is filled in the space. It is a fragmentary sectional view which shows an example of the outer plate | board and skeleton with which the surfboard of FIG. 1 is provided. It is process drawing which shows an example of the manufacturing method of the surfboard of this invention.

Hereinafter, the surfboard of the present invention and the manufacturing method thereof will be described in detail.
1 is a plan view showing an example of the upper surface (a) and the lower surface (b) of the surfboard of the present invention, FIG. 2 is a perspective view showing a skeleton provided in the surfboard of FIG. 1, and FIG. 3 is a skeleton of FIG. FIG. 4 is a partial plan view showing a state in which the cavities and spaces of the skeleton of FIG. 2 are filled with a meat component constituting material, and FIG. 5 is a plan view of FIG. FIG. 6 is a partial cross-sectional view showing an example of an outer plate and a skeleton included in the surfboard, and FIG.

<Surfboard>
The surfboard 10 according to the present embodiment has a skeleton 1, a meat part 2, and an outer plate 3 that covers the skeleton 1.

As shown in FIGS. 1 and 2, the skeleton 1 has a configuration in which a plurality of longitudinal bones 11 a, a plurality of longitudinal bones 11 b, and a plurality of transverse bones 12 are combined.
The longitudinal bone 11 a is a plate-like member disposed along the longitudinal direction of the surfboard 10. Further, as shown in FIG. 3, the longitudinal bone 11 a includes a plurality of notches 111 a that open toward the upper surface (surface on which a person rides) of the surfboard 10.

Further, the vertical bone 11b is a plate-like member arranged along the longitudinal direction of the surfboard 10. Further, as shown in FIG. 3, the longitudinal bone 11 b includes a plurality of notches 111 b that open toward the lower surface (surface on the water surface side) of the surfboard 10.

The transverse bone 12 is a member arranged so as to cross each longitudinal bone, that is, a member arranged along the short direction of the surfboard. Further, as shown in FIG. 3, the lateral bone 12 has a plurality of notches 121 a that open toward the upper surface of the surfboard 10, and a plurality of notches 121 b that open toward the lower surface of the surfboard 10. ing.
As shown in FIG. 3, the horizontal bone 12 has a configuration in which cutout portions 121 a and cutout portions 121 b are alternately arranged.

In the skeleton 1, the longitudinal bones 11a and the longitudinal bones 11b are alternately arranged. The plurality of notches 111a and notches 111b of the longitudinal bone 11a and the longitudinal bone 11b are engaged with the notches 121b of the plurality of horizontal bones 12 arranged so as to intersect the longitudinal bone. 1 is made. With such a configuration, the skeleton 1 has a lattice shape in plan view as shown in FIG.

As shown in FIG. 4, the skeleton 1 has a plurality of spaces 13 surrounded by vertical bones 11 a, vertical bones 11 b, and horizontal bones 12.
Although the material which comprises the vertical bone 11a, the vertical bone 11b, and the horizontal bone 12 which comprise the frame | skeleton 1 is not specifically limited, when the viewpoint of weight reduction and durability of the surfboard 10 is considered, it consists of a cardboard, a laminated paper, a baseboard, and a corrugated cardboard It is preferable to use at least one selected from the group, and it is more preferable to use cardboard.

As shown in FIGS. 4 and 5, the meat part 2 is formed so as to fill a part of the plurality of spaces 13. In other words, a part of the space 13 in which the meat part 2 is not provided remains. Furthermore, in other words, the area near the center when the surfboard 10 is viewed in plan (for example, the area surrounded by the broken line in FIG. 1) is a space 13 that remains, and the other spaces 13 are It is preferably filled with the meat part 2. Thus, by leaving the space 13 in which the meat portion 2 is not formed to some extent, it is possible to effectively reduce the weight of the surfboard 10 while maintaining the durability of the surfboard 10.

The ratio of the space 13 in which the meat portion 2 is not provided among all the spaces 13 is not particularly limited, but is preferably 50% or less, more preferably 10% or more and 40% or less, and 15% More preferably, it is 35% or less. Thereby, the weight reduction of the surfboard 10 can be achieved more effectively while the durability of the surfboard 10 is reliably maintained.

Examples of the material for constituting the meat part 2 include foamed polystyrene such as extruded polystyrene foam and beaded polystyrene foam, and polyurethane foam (foamed polyurethane) such as flexible urethane foam and rigid urethane foam. Among the above-mentioned, it is preferable that the meat part 2 is made of foamed polystyrene, and more preferably made of extruded polystyrene foam (particularly, Styrofoam IB (trade name, manufactured by Dow Chemical Co., Ltd.)). Thereby, the durability of the surfboard 10 can be made particularly high.

The density of the meat constituent material is preferably 20 kg / m ³ or more, and more preferably 25 kg / m ³ or more and 40 kg / m ³ or less. Thereby, the weight reduction of the surfboard 10 can be achieved more effectively.
The water absorption rate of the meat part constituting material is preferably 2.5% by volume or less, more preferably 2% by volume or less, and further preferably 1.5% by volume or less. The water absorption rate refers to the volume expansion rate when the meat component material is immersed in water for 21 days.

The outer plate 3 is provided so as to cover the entire skeleton 1 and the meat part 2.
As shown in FIG. 5, the outer plate 3 is composed of a laminated body in which a paper layer 31 and a reinforcing fiber layer 32 are laminated in order from the inner side (skeleton 1 side).

The paper layer 31 is a layer containing paper and resin. In other words, the paper layer 31 is a layer in which paper is impregnated with resin.
Although it does not specifically limit as paper which comprises the paper layer 31, It is preferable to use a shoji paper. Shoji paper has moderate air permeability and durability. For this reason, the durability of the surfboard 10 can be made higher while reducing the weight of the surfboard 10.

Paper constituting the paper layer 31, the basis weight is measured according to JIS P8124 is preferably at 40 g / ^{m 2} or more, more preferably 40 g / ^{m 2} or more 200 g / ^{m 2} or less. Thereby, durability can be improved more.
Moreover, it is preferable that the air permeability of the paper which comprises the paper layer 31 measured based on JISP8117 is 4.0 second or more. As a result, the resin impregnated into the paper during production (resin before curing) permeates the paper layer 31 and penetrates into the skeleton 1 (for example, in the space 13 or the material constituting the skeleton 1). Can be effectively prevented. As a result, the surfboard 10 can be effectively reduced in weight.

Moreover, it is preferable that the burst strength of the paper which comprises the paper layer 31 measured based on JISP8112 is 78.45 kPa or more. Thereby, durability of the surfboard 10 can be made higher. If the burst strength of the paper is too low, it may be torn during manufacture of the surfboard 10.
In addition, as paper which comprises the paper layer 31, you may use the thing containing water-soluble polymers, such as polyvinyl alcohol, for example. Further, as the paper constituting the paper layer 31, paper containing synthetic fibers such as rayon may be used.

Examples of the resin contained in the paper layer 31 include thermosetting resins such as epoxy resins, phenol resins, urea resins, melamine resins, polyester (unsaturated polyester) resins, polyimide resins, silicone resins, and polyurethane resins. Among these, it is preferable to use an epoxy resin from the viewpoints of handleability and cost.
As the resin, it is preferable to use a room temperature curable resin.
As the resin, it is preferable to use a type (two-component type) that is divided into two components of a monomer and a curing agent before curing.

In the case of using the two-component type, the viscosity of the mixture when the two components are mixed is preferably 2000 mPa · s or less at 25 ° C., and more preferably 1900 mPa · s or less. Thereby, in the manufacturing process mentioned later, provision becomes easy.
Moreover, it is preferable that the pot life in 20 degreeC of a 2 liquid type is 15 minutes or more, It is more preferable that it is 20 minutes or more and 40 minutes or less, It is further more preferable that they are 25 minutes or more and 35 minutes or less.
The resin may contain an ultraviolet absorber. Thereby, the light resistance of the surfboard 10 surface can be improved.

The reinforcing fiber layer 32 is a layer containing fibers and a resin.
The reinforcing fiber layer 32 is a layer that improves the strength of the outer plate 3.
Although it does not specifically limit as a fiber which comprises the reinforcing fiber layer 32, Glass fiber, carbon fiber, an aramid fiber, etc. can be used. Among these, it is more preferable to use glass fiber from the viewpoint of durability and cost.
The reinforcing fiber layer 32 is preferably a layer in which a resin is impregnated with a woven fabric or a non-woven fabric composed of the fibers.
Since the resin to be impregnated is the same as that described in the section of the paper layer 31, the description thereof is omitted.

As shown in FIG. 1, the surfboard 10 of this embodiment further includes a fin 4, an internal pressure adjustment valve 5, and a foot strap attachment 6.
The fin 4 has a function of improving the mobility of the surfboard 10.
The fin 4 is made of a resin (for example, a resin similar to the above resin) or the like.
The internal pressure adjustment valve 5 has a function of adjusting the pressure in the space 13. Thereby, durability can be improved, making the buoyancy in the water of the surfboard 10 favorable.
If the foot strap attachment 6 does not stand well on the board when riding a wave, or if the balance is lost while riding, the party and the board are connected by the foot strap so that the strap is pulled forward. It has a function that can catch the board immediately.

In the illustrated configuration, the configuration in which the surfboard 10 includes the three fins 4 has been described. However, the configuration is not limited thereto, and the surfboard 10 may include one or two, or may include four or more. Also good.
Moreover, although the structure which has an internal pressure adjustment valve and a foot strap attachment was demonstrated in the structure of illustration, these are not necessary.
In the illustrated configuration, the outer plate 3 includes the paper layer 31 and the reinforcing fiber layer 32. However, the paper layer 31 and the reinforcing fiber layer 32 are provided between the skeleton 1 and the meat part 2 and the paper layer 31. There may be an arbitrary resin layer composed only of the resin between or between the reinforcing fiber layers 32.

<Surfboard manufacturing method>
Next, a preferred embodiment of the method for manufacturing a surfboard according to the present invention will be described.
The manufacturing method of the surfboard 10 according to the present embodiment includes a skeleton assembly process in which a skeleton 1 is formed by combining a plurality of

longitudinal bones

11 a and 11 b and a transverse bone 12, and

longitudinal bones

11 a and 11 b and a transverse bone 12. A meat part forming step of filling the plurality of spaces 13 with the meat part constituent material to form the meat part 2; a paper pasting process for pasting the paper 31 'so as to cover the surfaces of the skeleton 1 and the meat part 2; A fiber placing step for placing the fibers 32 'on the paper 31', and a resin impregnation step for impregnating the fibers 32 'and the paper 31' with resin by applying a resin on the placed fibers 32 '. And a curing step for curing the impregnated resin.

(Frame assembly process)
In this step, the vertical bone and the horizontal bone shown in FIG. 3 are prepared and assembled to form the skeleton 1 (see FIGS. 2 and 6A).
Each longitudinal bone and each transverse bone may be bonded with an adhesive or the like as necessary.

(Meat part forming process)
In this step, the space 13 of the skeleton 1 is filled with the meat part constituent material described in the section of the meat part 2 to form the meat part 2 (see FIG. 6B).
The meat part constituent material is fixed to the skeleton 1 with an adhesive.
In addition, when the unevenness | corrugation of the meat part 2 comes out on the surface in formation of the meat part 2, the unevenness | corrugation of the surface can be adjusted using an electric plane etc.
Further, when forming the meat part 2, the final shape of the surfboard 10 can be adjusted.

(Paper pasting process)
In this step, an adhesive is applied to the surface of the surfboard 10 of each longitudinal bone and each lateral bone constituting the skeleton 1 and the surface of the meat part 2 to cover the entire skeleton 1 and the meat part 2. In this manner, the paper 31 ′ is pasted (see FIG. 6C).
In this step, it is preferable to spray water on the entire paper 31 ′ before pasting. By removing the moisture after being attached, the generation of wrinkles can be prevented.

In addition, after sticking paper 31 ', resin may be provided on paper 31' and resin may be impregnated into paper 31 '(pre-resin impregnation process). Thereby, it is possible to effectively prevent the paper 31 ′ from being unintentionally damaged in a subsequent process such as a fiber placing process described later. In addition, the paper 31 'can be more reliably impregnated with the resin than when only the resin impregnation step described later is performed.
As a resin application method, for example, a method such as application with a brush or application with a spray can be used.
Further, after impregnating the resin, the resin may be cured (pre-curing step).
Curing is preferably performed at 50 ° C. or less, and more preferably at 40 ° C. or less.
Furthermore, the unevenness of the surface of the paper 31 ′ may be polished using a file or the like after the resin is cured.

(Fiber placement process)
In this step, the fiber 32 ′ is placed on the pasted paper 31 ′ (see FIG. 6D).
In this step, the fiber 32 ′ may be pasted on the paper 31 ′ with an adhesive or the like.

(Resin impregnation process)
In this step, a resin is applied onto the placed fiber 32 ′ and the paper 31 ′ and the fiber 32 ′ are impregnated with the resin to form an uncured outer plate 3 ′ (see FIG. 6D).
As a resin application method, for example, a method such as application with a brush or application with a spray can be used.

(Curing process)
Next, the uncured outer plate 3 ′ is cured to form the outer plate 3 (see FIG. 5). As the resin hardens, the skeleton 1 and the meat part 2, the paper layer 31, and the reinforcing fiber layer 32 are firmly bonded.
In addition, you may repeat performing applying and hardening resin partially, seeing the hardening condition of resin. That is, the resin impregnation step and the curing step may be repeated alternately.
In consideration of the influence on the skeleton 1 and the paper 31 ′, the curing is preferably performed at 50 ° C. or less, and more preferably at 40 ° C. or less.

In addition, the manufacturing method of the surfboard of this embodiment has the following processes other than the said process.
(Polishing process)
In this step, the unevenness on the surface of the outer plate 3 is cut, and the feeling of touch and appearance are adjusted.
(Mounting part formation process)
In this step, an attachment portion for attaching the fin 4, the internal pressure adjusting valve 5 and the foot strap attachment 6 is formed. In addition, you may perform this process before the said grinding | polishing process.

(Fin 4, internal pressure adjustment valve 5 and foot strap attachment 6 attachment process)
In this step, the fin 4, the internal pressure adjustment valve 5, and the foot strap attachment 6 are attached.
Thereby, the surfboard 10 as shown in FIG. 1 is obtained.

As mentioned above, although the preferred embodiment of the surfboard of this invention and its manufacturing method was described, this invention is not limited to this.

DESCRIPTION OF SYMBOLS 10 Surfboard 1 Frame |

skeleton

11a,

11b Longitudinal bone

111a, 111b Notch part 12

Horizontal bone

121a, 121b Notch part 13 Space 2 Meat part 3 Outer board 3 'Uncured outer board 31 Paper layer 31' Paper 32 Reinforcement fiber layer 32 ' Textile 4 Fin 5 Internal pressure regulating valve 6 Foot strap attachment

Claims

A skeleton composed of a combination of a plurality of longitudinal bones arranged in the longitudinal direction of the surfboard and a plurality of transverse bones arranged in a direction intersecting the longitudinal bones;
A meat part formed so as to fill at least a part of a space formed by the vertical bone and the horizontal bone;
An outer plate formed so as to cover the surface of the skeleton and the meat part,
The said outer plate | board has a paper layer containing paper and resin in order from the said frame | skeleton side, and a reinforced fiber layer containing a fiber and resin, The surfboard characterized by the above-mentioned.
The surfboard according to claim 1, wherein a basis weight of the paper constituting the paper layer is 40 g / m 2 or more.
The surfboard according to claim 1 or 2, wherein the air permeability of the paper constituting the paper layer is 4.0 seconds or more.
The surfboard according to any one of claims 1 to 3, wherein a burst strength of the paper constituting the paper layer is 78.45 kPa or more.
The surfboard according to any one of claims 1 to 4, wherein the paper constituting the paper layer is shoji paper.
The surfboard according to any one of claims 1 to 5, further comprising an internal pressure adjusting valve that adjusts the pressure in the space.
The surfboard according to any one of claims 1 to 6, wherein the skeleton is composed of at least one selected from the group consisting of cardboard, laminated paper, mount, and cardboard.
The surfboard according to any one of claims 1 to 7, wherein the meat portion is made of foamed polystyrene.
The surfboard according to any one of claims 1 to 8, wherein the resin constituting the resin layer is an epoxy resin.
A skeleton assembly process for forming a skeleton by combining a plurality of vertical bones arranged in the longitudinal direction of the surfboard and a plurality of horizontal bones arranged in a direction intersecting the vertical bones;
A meat part forming step of forming a meat part in a space formed by the vertical bone and the horizontal bone;
A paper pasting step of pasting paper so as to cover the surface of the skeleton and the meat part;
A fiber placing step of placing fibers on the pasted paper;
A resin impregnation step of applying a resin on the fiber and impregnating the fiber and the paper with the resin;
And a curing step for curing the impregnated resin.
After the paper sticking step, before the fiber placing step,
The surfboard according to claim 10, further comprising: a pre-resin impregnation step of applying a resin to the pasted paper and impregnating the paper with the resin; and a pre-curing step of curing the resin impregnated into the paper. Production method.