JP7321955B2 - tubular body - Google Patents

Description

TECHNICAL FIELD The present invention relates to tubular bodies that can be used for tubular bodies, golf club shafts, tennis rackets, and the like, and methods for manufacturing the same.

Conventionally, a sheet-like prepreg made by impregnating a reinforcing fiber such as carbon fiber with a thermosetting resin such as epoxy is wound around a mandrel to form a tube material, and polypropylene or the like is wrapped around the tube material. Various tubular bodies that can be used for fishing rod shafts and the like are known, which are manufactured by winding and firing a molding tape of .

In such a tubular body, in addition to general painting, the surface of the tubular body is decorated by physical vapor deposition such as vacuum deposition and ion plating. can brew.

As such a tubular body, for example, in Patent Document 1, the outer peripheral surface of a fishing rod blank is arranged in parallel or at an acute angle with respect to the axial direction and arranged side by side along the axial direction. It has a plurality of wall surfaces that are continuous with both ends of the surface and intersect with the parallel surfaces, and includes a metal layer formed only on the parallel surfaces of the outer peripheral surface, and a resin layer that covers the metal layers. A fishing rod blank is disclosed.

Further, in Patent Document 2, after a mask member is arranged on the peripheral surface of a tubular body, titanium oxide is physically vapor-deposited on the peripheral surfaces of the tubular body and the mask member to form a titanium oxide layer; a step of forming a transparent or translucent clear layer on the peripheral surface of the layer; a step of peeling off the mask member; and a step of forming a transparent or colored urethane layer on the peripheral surface of the clear layer from which the mask member has been peeled off. A tubular body made of a fiber-reinforced resin in which reinforcing fibers are impregnated with a synthetic resin is disclosed, to which a method for coating the peripheral surface of the tubular body is applied.

JP-A-2017-12098 Japanese Patent Application Laid-Open No. 2005-138080

However, in the fishing rod blank of Patent Document 1, in order to achieve a high-class metallic tone, the orientation of the chromium particles is disturbed due to the decrease in the viscosity of the resin, so a thick chromium layer is necessary, and a urethane layer is also necessary. As a result, not only does the weight increase, but there is also the problem that only a uniform metallic appearance can be obtained.

In addition, in the tubular body of Patent Document 2, titanium oxide is physically vapor-deposited on the surface of the formed tubular body, but the adhesion between the base material and the coating layer is not necessarily good, and there is a problem in terms of durability. rice field.

One of the objects of the present invention is to provide a tubular body which has a metallic appearance with a thinner layer and a high-class feeling and which is easy to change in color tone, and which has improved adhesion to the substrate and durability, and a method for producing the same. That's what it is. These and other objects of the present invention will become apparent upon reference to the specification as a whole.

A tubular body according to an embodiment of the present invention includes a tubular main body formed by winding a fiber-reinforced prepreg made by impregnating reinforcing fibers with a synthetic resin, and a fiber-reinforced resin layer positioned as the outermost layer of the main body. and chromium particles disposed on the outer surface portion of the resin portion positioned outside the reinforcing fibers, wherein the chromium particles are outside the resin portion when viewed in the thickness direction of the resin portion. From the surface, 5% to 100% of the co-directional thickness of the chromium grain is configured to be embedded in the outer surface region.

In the tubular body according to one embodiment of the present invention, the outer surface of the chromium particles is arranged along the outer surface of the fiber reinforced resin layer.

In the tubular body according to one embodiment of the present invention, when the chromium particles are embedded from the outer surface of the resin portion by 100% of the thickness of the chromium particles in the same direction, the chromium particles are embedded in the resin At least a portion of the outer surface of the portion is covered with the resin portion when viewed in the extending direction of the outer surface of the portion.

In the tubular body according to one embodiment of the present invention, when the chromium particles are embedded from the outer surface of the resin portion by 100% of the thickness of the chromium particles in the same direction, the chromium particles are embedded in the resin It is configured such that a maximum of 80% of the outer surface of the portion is covered with the resin portion when viewed in the direction of extension.

A method for manufacturing a tubular body according to an embodiment of the present invention includes winding a fiber-reinforced prepreg obtained by impregnating reinforcing fibers with a synthetic resin around a core member, winding a molding tape around the fiber-reinforced prepreg, and forming the fiber-reinforced prepreg. The method includes the steps of firing to form a tube blank, removing the forming tape, spraying the tube blank with chromium particles, and firing the tube blank at a temperature above the glass transition temperature (Tg) of the synthetic resin.

In a method of manufacturing a tubular body according to an embodiment of the invention, after spraying the tube blank with chromium particles and before firing the tube blank, the tube blank is wrapped with a forming tape.

In the method for manufacturing a tubular body according to one embodiment of the present invention, the temperature above the glass transition point (Tg) of the synthetic resin is in the range of 40°C to 250°C.

In the tubular body manufacturing method according to one embodiment of the present invention, the synthetic resin is an epoxy resin.

In the method for manufacturing a tubular body according to one embodiment of the present invention, when the synthetic resin is an epoxy resin, the temperature above the glass transition point (Tg) is in the range of 80°C to 200°C.

In the method for manufacturing a tubular body according to one embodiment of the present invention, the chromium particles are mixed in a solvent before being sprayed.

According to each of the above-described embodiments of the present invention, a tubular body and a method for manufacturing the same can be provided in which a metallic appearance with a high-class feeling and easy color tone change is obtained with a thinner layer, and the adhesion to the substrate and durability are improved. can be provided.

(a)-(d) are diagrams showing one state in a method for manufacturing a tubular body according to one embodiment of the present invention. FIG. 4 is a diagram schematically showing a cross section of one mode of a tubular body taken along a plane perpendicular to its central axis. FIG. 4 is a diagram schematically showing a cross section of one mode of a tubular body taken along a plane perpendicular to its central axis. FIG. 4 is a diagram schematically showing a cross section of one mode of a tubular body taken along a plane perpendicular to its central axis. FIG. 4 is a diagram schematically showing a cross section of one mode of a tubular body taken along a plane perpendicular to its central axis. It is a figure which shows the close_contact|adherence result of one aspect|mode of a tubular body. It is a figure which shows the close_contact|adherence result of one aspect|mode of a tubular body. It is a figure which shows the close_contact|adherence result of one aspect|mode of a tubular body. It is a figure which shows the close_contact|adherence result of one aspect|mode of a tubular body. FIG. 10 is a cross-sectional view showing a close contact result of one aspect of the tubular body;

EMBODIMENT OF THE INVENTION Hereafter, embodiment of the tubular body which concerns on this invention is concretely described, referring an accompanying drawing. Elements that are common to multiple figures are labeled with the same reference numerals throughout the figures. Please note that each drawing is not necessarily drawn to an exact scale for convenience of explanation.

1a-1d, a method for manufacturing a tubular body according to an embodiment of the invention will first be described.

In a method for manufacturing a tubular body according to an embodiment of the present invention, in step 1, a fiber-reinforced prepreg made by impregnating reinforcing fibers with a synthetic resin is wound around a core member. Here, an epoxy resin will be described as an example of the synthetic resin. As synthetic resins, unsaturated polyester resins and phenolic resins are also conceivable, but they are not limited to these. As the reinforcing fibers, carbon fibers, glass fibers, and any other known reinforcing fibers can be used.

Next, in step 2, the fiber reinforced prepreg is wrapped with a forming tape as shown in FIG. 1a. In step 3, the fiber-reinforced prepreg is baked to form a tube material having a hardened epoxy resin layer formed on the surface layer.

In step 4, the forming tape is removed, as shown in FIG. 1b. In step 5, the tube blank is sprayed with chromium particles, as shown in FIG. 1c. Here, the chromium particles include evaporated chromium particles, but are not limited thereto. Instead of chromium particles, scale-like particles such as aluminum pigments and pearl pigments may be used. Alternatively, the chromium particles may be mixed in a solvent before being sprayed. Also, a low boiling point solvent such as acetone can be used as the solvent. In step 6, the fiber reinforced prepreg is wrapped with a forming tape as shown in FIG. 1d. Here, step 6 can be omitted.

Next, in step 7, the tube material is sintered at a temperature higher than the glass transition point (Tg) of the synthetic resin, epoxy resin in this example. The temperature above the glass transition point (Tg) of the synthetic resin is in the range of 40° C. to 250° C. When the synthetic resin is an epoxy resin, the temperature above the glass transition point (Tg) is 80° C. to 200°C. In this way a tubular body according to an embodiment of the invention can be formed. Note that the outer surface of the tubular body may be appropriately polished.

Since the epoxy resin is hardened by the baking in step 3, a sudden decrease in viscosity can be avoided during the baking in step 7, and the viscosity is slightly lowered at the glass transition point (Tg), and the chromium particles are removed from the epoxy resin. It becomes possible to fix to the resin surface layer.

As described above, with the method for manufacturing a tubular body according to an embodiment of the present invention, a metal-like appearance with a high-class feeling and easy color tone change is obtained with a thinner layer, and adhesion to the substrate and durability are improved. It is possible to provide a tubular body with a

2-9, a tubular body according to one embodiment of the invention will now be described in comparison with other aspects.

FIG. 2 shows, by way of example, aspects for comparison with a tubular body according to an embodiment of the invention. The embodiment shown in FIG. 2 shows the case where the chromium particles are sprayed before the firing in step 3 described above. As shown in FIG. 2, the chromium particles 130 enter the layer of the epoxy resin 120 formed outside the layer of the carbon fibers 110 of the tubular body 100, and the arrangement of the particles 130 is also random. In this way, when the fiber-reinforced prepreg is baked by blowing chromium particles before the baking, the chromium particles with a large specific gravity settle in the epoxy resin as the viscosity of the epoxy resin decreases, and the orientation of the particles is disturbed. It was found that it is difficult to develop a disordered metallic appearance.

FIG. 6 shows the evaluation results of adhesion in the embodiment shown in FIG. As shown in FIG. 6, in the embodiment shown in FIG. 2, the adhesion of the chromium particles was good, with a score of 10 in the cross-cut tape method (JIS K 5400 8.5.2), indicating that there was no peeling. understood.

Next, FIG. 3 shows another aspect as an example for comparison with a tubular body according to one embodiment of the present invention. The embodiment shown in FIG. 3 shows the case where chromium particles are sprayed after firing in step 3 described above, and firing in step 7 described above is not performed. As shown in FIG. 3, chromium particles 230 are adhered to the surface of the layer of epoxy resin 220 formed outside the layer of carbon fibers 210 of tubular body 200, and the particles 230 are well arranged. As described above, when chromium particles are sprayed after firing the fiber-reinforced prepreg, the disturbance of the particle orientation is reduced compared to the case of Mode 1, and a good appearance with a metallic tone is exhibited. found to be obtainable.

FIG. 7 shows evaluation results of adhesion in the embodiment shown in FIG. As shown in FIG. 7, in the embodiment shown in FIG. 3, the adhesion of the chromium particles was weak, and the cross-cut tape method (JIS K 5400 8.5.2) scored 0, indicating that 65% or more of the particles were peeled off. .

Next, FIG. 4 shows an example of a tubular body according to one embodiment of the present invention. In a tubular body according to an embodiment of the present invention, as shown in FIG. 4, a tubular main body 10 formed by winding a fiber-reinforced prepreg 5 formed by impregnating a synthetic resin 3 into a reinforcing fiber 2, and the main body chromium particles 4 disposed on the outer surface portion of the resin portion positioned outside the reinforcing fibers in the fiber reinforced resin layer 5 positioned as the outermost layer.

Further, in the tubular body 1 according to one embodiment of the present invention, the outer surface of the chromium particles 4 is arranged along the outer surface of the fiber reinforced resin layer 5 . Furthermore, in the tubular body 1 according to one embodiment of the present invention, the chromium particles 4 are configured such that at least a portion thereof is embedded in the outer surface region. Here, in the tubular body 1 according to one embodiment of the present invention, the chromium particles 4, when viewed in the thickness direction of the resin portion, extend from the outer surface of the resin portion to the thickness of the chromium particles 4 in the same direction. 5% to 100% of is embedded in the outer surface area. Since the chromium particles themselves do not necessarily have a uniform particle diameter, when there are many relatively fine particles, more particles are embedded in the resin. Here, in the example of FIG. 4, as shown in FIG. 10, it was found that about 50% of the chromium particles 4 were embedded in the outer surface portion.

In the tubular body according to one embodiment of the present invention, when the chromium particles are embedded from the outer surface of the resin portion by 100% of the thickness of the chromium particles in the same direction, the chromium particles are embedded in the resin At least a portion of the outer surface of the portion is covered with the resin portion when viewed in the extending direction of the outer surface of the portion.

In the tubular body according to one embodiment of the present invention, when the chromium particles are embedded from the outer surface of the resin portion by 100% of the thickness of the chromium particles in the same direction, the chromium particles are embedded in the resin It is configured such that a maximum of 80% of the outer surface of the portion is covered with the resin portion when viewed in the direction of extension.

FIG. 8 shows evaluation results of adhesion in the embodiment shown in FIG. As shown in FIG. 8, in the tubular body 1 according to the embodiment of the present invention shown in FIG. It turned out to be possible. The reason for this is that since the epoxy resin is cured by the baking in step 3, a rapid decrease in viscosity can be avoided during the baking in step 7, and the viscosity is slightly lowered at the glass transition point (Tg). This is probably because the chromium particles can be more firmly fixed to the epoxy resin surface layer.

As described above, with the tubular body 1 according to the embodiment of the present invention, a metallic appearance with a high-class feeling and easy color tone change is obtained with a thinner layer, and a tubular body with improved adhesion to the base material and durability is improved. It turned out that it would be possible to donate the body.

Next, FIG. 5 shows another aspect as an example for comparison with a tubular body according to one embodiment of the present invention. The embodiment shown in FIG. 5 shows the case where the chromium particles 340 are sprayed and the topcoat layer 330 is applied after the baking in step 3 described above. As shown in FIG. 5, the chromium particles 340 are formed so as to enter the overcoat layer 330 outside the epoxy resin 320 layer formed outside the carbon fiber 310 layer of the tubular body 300 . The arrangement of the particles 340 is random. In this way, when the chromium particles are sprayed and the topcoat layer is applied after the fiber-reinforced prepreg is baked, the orientation of the particles is slightly disturbed, as in the case of Embodiment 1. It was found that the orientation was disturbed and it was difficult to develop a metallic appearance.

FIG. 9 shows evaluation results of adhesion in the embodiment shown in FIG. As shown in FIG. 9, in the embodiment shown in FIG. 5, the adhesion of the chromium particles 340 is good, with a score of 10 in the cross-cut tape method (JIS K 5400 8.5.2), and no peeling. found out.

Moreover, since the topcoat layer 330 is required in the embodiment shown in FIG. 5, the weight increases. As described above, the tubular body according to one embodiment of the present invention is more effective than the embodiment of FIG. 5 in terms of weight reduction, good metallic appearance, and improved adhesion and durability. I understand.

The dimensions, materials, and arrangements of each component described herein are not limited to those explicitly described in the embodiments, and each component may be included within the scope of the present invention. can be modified to have dimensions, materials, and arrangements of Also, components not explicitly described in this specification may be added to the described embodiments, and some of the components described in each embodiment may be omitted.

1 Tubular body 2 Reinforcing fiber 3 Synthetic resin 4 Chromium particles 5 Fiber-reinforced resin layer 10 Tubular body 100 Tubular body 110 Carbon fiber 120 Epoxy resin 130 Chromium particles 200 Tubular body 210 Carbon fiber 220 Epoxy resin 230 Chromium particles 300 Tubular body 310 Carbon Fiber 320 Epoxy resin 330 Overcoat layer 340 Chromium particles

Claims (6)

A fiber-reinforced prepreg made by impregnating a reinforcing fiber with a synthetic resin is wound around a core member,
winding a molding tape around the fiber-reinforced prepreg;
sintering the fiber-reinforced prepreg to form a tube material,
removing the molding tape;
spraying chromium particles onto the tube material;
The tube material is fired at a temperature equal to or higher than the glass transition point (Tg) of the synthetic resin,
The chromium particles are arranged on the outer surface portion of the resin portion positioned outside the reinforcing fibers in the fiber-reinforced resin layer positioned as the outermost layer of the pipe material, and the thickness of the resin portion A tubular body formed so as to be embedded in the outer surface portion within a range of 5% to 100% of the thickness of the chromium particles in the same direction from the outer surface of the resin portion when viewed in the direction. Production method. 2. The method of manufacturing a tubular body according to claim 1 , wherein a forming tape is wound around the pipe material after spraying the chromium particles on the pipe material and before firing the pipe material. The method for manufacturing a tubular body according to claim 1 or 2 , wherein the temperature above the glass transition point (Tg) of the synthetic resin is in the range of 40°C to 250°C. The method for manufacturing a tubular body according to any one of claims 1 to 3 , wherein the synthetic resin is an epoxy resin. The tubular body according to any one of claims 1 to 3 , wherein when the synthetic resin is an epoxy resin, the temperature above the glass transition point (Tg) is in the range of 80°C to 200°C. manufacturing method. The method for manufacturing a tubular body according to any one of claims 1 to 5 , wherein the chromium particles are mixed in a solvent before being sprayed.

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