JP2011155887A - Tubular body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular body which effectively prevents slippage and is excellent in a gripping characteristic without deteriorating strength. <P>SOLUTION: The tubular body 10 prepared by winding prepreg sheets comprising synthetic fibers f impregnated with a synthetic resin p and forming step portions with fastening tapes for tightening the prepreg sheets on the outer peripheral surface is characterized by having the first spirally extended step portion 20 and the second spirally extended step portion 22 on the outer peripheral surface and forming one of the first step portion 20 and the second step portion 22 at a smaller pitch than that of the other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tubular body, and in particular, relates to a tubular body in which a fiber reinforced prepreg in which a reinforced fiber is impregnated with a synthetic resin is wound, and a stepped portion is formed on an outer peripheral surface by a fastening tape for fastening these prepreg sheets.

  In general, a tubular body used for a fishing rod of a fishing rod is formed by forming a prepreg sheet in which a reinforcing fiber is impregnated with a synthetic resin into a laminated body by winding the prepreg sheet so as to be polymerized on a core metal, and fastening tape thereon. After being wound and stabilized, the synthetic resin is thermoset in a heating furnace, then cooled and decentered, and then the fastening tape is removed. On the outer peripheral surface of the tubular body after the fastening tape is removed, a spiral step portion is formed by the fastening tape.

  The tubular body after molding undergoes processes such as polishing and painting on the outer peripheral surface to complete the product. For example, a required part of a finished product such as a gripping part is provided with a non-slip means for improving gripping property.

  In such a tubular body, a tape-shaped prepreg is wound instead of a sheet-like prepreg so that a part of the width direction overlaps, and an uneven portion is formed on the outer surface of the bag (for example, Patent Document 1). reference).

  In addition, the bag material after peeling the fastening tape is inserted into a polishing agent having a hardness higher than that of the cured resin of the prepreg sheet and lower than that of the reinforcing fiber, and gives vibration to the polishing agent. There is also a fishing rod that is polished by a relative movement between a rod material and an abrasive to form a rod material in which a part of reinforcing fibers having a diameter of 5 to 8 microns is protruded from the resin (see, for example, Patent Document 2).

JP-A-4-214329 JP-A-6-327380

  Steps and irregularities formed in such a fiber reinforced resin tubular body can be formed smoothly through processes such as polishing and painting, but the simplification of the manufacturing process and effective utilization of raw materials In order to achieve this, it is desired to maintain the step portion formed at the time of molding and improve the gripping property more effectively.

  However, a ridge formed by winding a tape-shaped prepreg often polishes the surface or provides a coating layer even if a large step portion can be formed. Further, even if the spiral stepped portion of the fastening tape is left on the surface of the fishing rod, it is not possible to obtain a sufficient gripping property that prevents slippage with a single spiral stepped portion.

  The present invention has been made based on such circumstances, and an object of the present invention is to provide a tubular body excellent in gripping ability that effectively prevents slipping without impairing its strength.

  The present invention that achieves the above object is a tubular body in which a prepreg sheet impregnated with a synthetic resin in a reinforcing fiber is wound, and a stepped portion is formed on an outer peripheral surface by a fastening tape for fastening these prepreg sheets, Provided is a tubular body having first and second step portions extending in a spiral shape, and one of the first step portion and the second step portion is formed with a smaller pitch than the other.

  It is preferable that the helical twist angles formed by the first and second step portions are formed in directions opposite to each other with respect to the longitudinal direction of the tubular body.

  The first and second step portions each have an end surface portion formed between the side surface portions that extend in a spiral shape so as to be narrower than the side surface portions, and the end surface portion of the first step portion and the second step portion The end surface portion may be disposed in the opposite direction along the longitudinal direction of the tubular body.

  It is preferable that the first step portion and the second step portion intersect each other at an angle of 2.0 to 10.0 degrees.

  According to the tubular body of the present invention, the first and second step portions formed on the outer peripheral surface by the fastening tape are extended in a spiral shape having different pitches, thereby preventing stickiness due to the sweat of the gripping hand. However, slipping in the axial direction and the circumferential direction is effectively prevented, and it is possible to move while confirming the gripping position via the first and second step portions having different pitches, and the gripping property is excellent. Tubular bodies can be formed.

  When the helical twist angle formed by each of the first and second step portions is formed in directions opposite to each other with respect to the longitudinal direction of the tubular body, the gripping position is accurately determined from the difference between the twist angles. Can be moved to.

  When the end surface portions of the first and second step portions are arranged in opposite directions along the longitudinal direction of the tubular body, it is possible to prevent slipping in both directions along the axial direction and further improve operability. .

  When the first step portion and the second step portion intersect each other at an angle of 2.0 to 10.0 degrees, these intersections prevent slipping more effectively when the tubular body is gripped. can do.

1 is a schematic plan view of a tubular body according to a preferred embodiment of the present invention. The enlarged view of a part of tubular body of FIG. The laminated structure of the tubular body of FIG. 1 is shown, (A) is a cross-sectional view of a tubular body, (B) is an enlarged view of the site | part enclosed with the circle B. FIG. Explanatory drawing of 1 process which forms the tubular body of FIG. Explanatory drawing of the process after FIG. Explanatory drawing of the process by other embodiment. FIG. 7 is an enlarged view of a part of a tubular body formed in the process of FIG. 6.

  1 and 2 show a tubular body 10 according to a preferred embodiment of the present invention.

  The tubular body 10 is formed, for example, for a fishing rod, and has a hollow thin-walled main body 12 along the entire length of the tubular body 10. The tubular body 10 may be used as a fishing rod.

  The main body 12 is formed by winding a prepreg sheet in which a reinforcing fiber f is impregnated with a synthetic resin p around a cored bar (not shown). In such a prepreg sheet, for example, carbon fiber, glass fiber alumina fiber, or aramid fiber having a fiber diameter of about 3 to 20 μm is preferably used as the reinforcing fiber f (see FIG. 3B). As the resin p to be impregnated (see FIG. 3B), for example, a thermosetting resin such as an epoxy resin, a polyester resin, or a phenol resin is preferable, and a thermoplastic resin such as polyamide may be mixed.

  A first step portion 20 extending in a spiral shape with a large pitch and a second step portion 22 extending in a spiral shape with a small pitch are formed on the outer peripheral surface of the main body 12 made of this fiber reinforced resin. These first and second step portions 20 and 22 are formed by fastening wound prepreg sheets by fastening tapes T1 and T2 (FIGS. 4 and 5) on a core metal. 20 and 22 will be described later.

  As shown in FIG. 3, the main body 12 of the tubular body 10 is formed as a tapered hollow body as a whole. The main body 12 has a laminated structure in which a plurality of prepreg sheets are laminated in order from the inside, the innermost layer 14 in which the reinforcing fibers f are oriented in the circumferential direction with respect to the central axis 12a of the main body 12, and the reinforcing fibers f at the center. The intermediate layer 16 oriented in the axial length direction along the axis 12a and the outermost layer 18 in which the reinforcing fibers f are oriented in the circumferential direction are formed. The intermediate layer 16 of the present embodiment includes two layers of an inner intermediate layer 16a and an outer intermediate layer 16b that are continuous over the entire length, improves the bending rigidity along the axial length direction of the main body 12, and sandwiches the intermediate layer 16 therebetween. The innermost layer 14 and the outermost layer 18 prevent the body 12 having a hollow structure from being crushed. As a result, the main body 12 can ensure basic bending strength so as to be able to withstand large tensile forces in the axial length direction and torsional direction while allowing large bending.

  If necessary, it is also possible to arrange a reinforcing layer in a part along the axial length direction of the main body 12, and as such a reinforcing layer, a circumferential prepreg in which reinforcing fibers f are aligned in the circumferential direction, An axial prepreg in which the reinforcing fibers f are aligned in the axial length direction and an oblique prepreg in which the reinforcing fibers f are aligned in the inclined direction with respect to the axial length direction can be appropriately combined and wound.

  In the present embodiment, in consideration of both strength and weight reduction of the main body 12, the prepreg sheet for forming the innermost layer 14, the intermediate layer 16, and the outermost layer 18 is formed with a resin impregnation amount in the range of 10 to 40 wt%. For example, by setting the content in the range of 10 to 30 wt%, a stable tubular body in which a balance between strength and weight reduction can be obtained can be obtained.

  The main body 12 formed of a prepreg sheet with a small amount of resin impregnation as described above is enlarged in FIG. 3B, and the density of the reinforcing fibers f is extremely high, and adjacent reinforcing fibers are in contact with each other. It becomes. Thereby, when firing, meandering due to the movement of the reinforcing fiber f is suppressed. A high-strength characteristic that maximizes the characteristics of each reinforcing fiber f can be maintained, and a lightweight structure can be achieved with a small amount of resin.

  Moreover, if the resin impregnation amount is in the range of 10 to 30 wt%, the resin pool portion s containing the synthetic resin more than other regions is formed along the boundary portion between the layers adjacent to the prepreg sheet. Thereby, delamination between adjacent prepreg sheets is prevented, and a strong monolithic laminated body is formed. In the present embodiment, resin pool portions s with a high synthetic resin ratio are formed at a plurality of locations in the intermediate portion in the thickness direction of the outer intermediate layer 16b. The resin pool s in such a layer is formed in a state where the synthetic resin flows into a portion where the reinforcing fiber f is sparse and is individually independent. Thereby, the whitening by the stress concentration to the resin pool s between adjacent layers can be prevented, and the decrease in elasticity can be suppressed.

  In the present embodiment, the main body 12 of the tubular body 10 is formed such that the amount of resin on the surface of the outermost layer 18 is smaller than that of the inner layer side of the outermost layer 18, and reinforcing fibers are formed on at least a part of the outer peripheral surface of the main body 12. It is arranged so as to be directly exposed without being covered with the synthetic resin p impregnated with f. Thus, by exposing the hard reinforcing fibers f on the outer peripheral surface, when touching with the hand holding the reinforcing fibers arranged in the circumferential direction of the outermost layer 18, there is a rough feel and slipping is prevented. Furthermore, for example, when used as a fishing rod, fine fish bean can be transmitted to the hand to be held through the reinforcing fiber, and the sensitivity to the fish bean can be increased. When the main body 12 is formed to have an outer diameter of about 20 to 40 mm suitable for fishing rods and a thickness of about 100 to 500 μm, the outermost layer 18 is preferably formed to a thickness of about 10 to 50 μm.

  Thus, in order to expose the reinforcing fibers on the outer peripheral surface, it is necessary to form the prepreg sheet with a small amount of resin impregnation. When forming such a prepreg sheet with a small amount of resin impregnation into a cylindrical shape, it is necessary to securely press and press with a fastening tape.

  4 and 5 show a process of forming the main body 12 with such a prepreg sheet having a small resin impregnation amount.

  As shown in the figure, after winding the prepreg sheet forming the outermost layer 18, on the prepreg sheet, the taper-shaped main body 12, for example, from the one end side which is the small diameter side (tip side) to the large diameter side (base Up to the end side), the fastening tape T1 is spirally wound over its entire length. The tightening tape T1 is wound on the tip side while the other side edge of the tightening tape T1 to be wound is overlapped on the one side edge of the tightening tape T1 wound earlier. The base 12 is wound along the direction of the spiral R1, and the entire outer peripheral surface of the main body 12 is covered with the fastening tape T1. Further, from the upper side of the fastening tape T1, for example, the side edge portion is wound first in the same manner as the fastening tape T1 from the other end, which is the base end portion, in the direction of the spiral R2 opposite to the fastening tape T1. Wrapping while overlapping the adjacent side edges of the tightening tape T2. The prepreg sheet is tightened with a large tightening force via the tightening tape T1 and the tightening tape T2 wound around the tightening tape T1.

  The fastening tapes T1 and T2 are preferably about 20 to 25 μm in thickness in the range of 15 to 30 μm, and may be formed of an appropriate material as long as the required fastening force for the prepreg sheet can be formed. Can do. Moreover, the width | variety will be 0.2 mm-10 mm of pitch, if the adjacent side edge part is piled up by the width dimension of about 0.1-1.0 mm, and it can wind over the full length of the outer peripheral surface of the main body 12. As long as it can be formed in an appropriate width, it can be formed in an appropriate size.

  Further, the fastening tape T1 is wound over the entire length of the main body 12 at a pitch t1 in the range of 3.0 to 10.0 mm, preferably 5 mm. The fastening tape T2 extends over the entire length of the main body 12 from above the fastening tape T1. It is wound at a pitch t2 of 0.5 mm, for example, selected from the range of 0.2 mm to 2.0 mm, which is smaller than the first fastening tape. Therefore, the fastening tape T2 is formed narrower than the fastening tape T1.

  Thus, by winding the narrow tightening tape T2 at the smaller pitch t2 on the wide tightening tape T1 wound at the large pitch t1, the tightening tape T2 exerts a large tightening force. Even in the case of forming, it is possible to prevent the reinforcing fiber f from being moved by the fastening tape T1, and further to prevent the reinforcing fiber f from being damaged.

  In this way, the reinforced prepreg sheet is pressed over the tie-up tape T1 and the prepreg sheet is pressed over the tie-up tape T1, so that the reinforcing fibers on the outer peripheral surface are biased inward during firing, or double taping. A fiber shift occurs in the tape removal due to the above, and a fine recess (not shown) is formed on the surface. In this case, the synthetic resin p covering the reinforcing fiber f on the surface side of the outer peripheral portion moves to the inner layer side with the outer surface of the reinforcing fiber f exposed, and the reinforcing fiber f is held on the inner peripheral side. . The depressions thus formed have, for example, a depth of 2 to 20 μm, a circumferential direction of 2 to 200 μm, an axial length direction of about 2 to 20 μm, and an elongated shape in the circumferential direction.

  After stabilizing with the fastening tapes T1 and T2, the synthetic resin is thermoset, then cooled, decentered, and then the fastening tapes T1 and T2 are peeled off to form the main body 12 shown in FIG. Is done. Reinforcing fibers exposed on the outer peripheral surface of the main body 12 efficiently transmit fine vibrations such as fish shin to the hand to be gripped, and the fine dents formed on the surface are also drawn on the fingerprints of fingers, for example. It is easy to get a feeling of hanging and has a non-slip action.

  As shown in FIG. 2 in an enlarged manner, the spiral first step portion 20 and second step portion 22 formed of the fastening tapes T1 and T2 have the same large pitch t1 and small pitch t2 as described above. It extends along two spiral filaments.

  The first step portion has an end surface portion 20b formed between the side surface portions 20a and 20a spirally adjacent to each other with a width of the pitch t1. As is apparent, the side surface portion 20a has a tapered shape formed by contacting the surface portion of the fastening tape T1. Further, the end surface portion 20b is a portion where the side edges of the fastening tape T1 are overlapped, is formed by contacting the side surface of the lower fastening tape, and is formed to be narrower than the side surface portion 20a. The side surface portion 20a and the end surface portion 20b form a spiral continuous filament on the outside thereof, and have a twist angle of an angle α with respect to the reference line D orthogonal to the central axis 12a.

  Similarly, the second step portion has an end surface portion 22b formed between the side surface portions 22a and 22a spirally adjacent to each other with a width of the pitch t2. As is apparent, the side surface portion 22a has a tapered shape formed by contacting the surface portion of the tightening tape T2, and the end surface portion 22b is a portion where the side edges of the tightening tape T2 are overlapped, and the lower tightening portion. It is formed by coming into contact with the side surface of the tape, and is narrower than the side surface portion 22a. The side surface portion 22a and the end surface portion 22b form a continuous spiral line on the outside thereof, and have a twist angle of an angle β with respect to the reference line D.

  The pitch t1 of the first step portion 20 is larger than the pitch t2 of the second step portion 22, the end surface portion 20b of the first step portion is wider than the end surface portion 22b of the second step portion, and a larger step is formed. To do. These steps can be formed to have the same size by smooth polishing in a later step.

  The first and second step portions 20 and 22 are extended in spirals having different pitches t1 and t2, respectively, and prevent slipping in the axial direction and the circumferential direction while preventing stickiness due to sweat of the gripping hand. The tubular body 10 can be moved while confirming the gripping position on the main body 12 via the first step portion 20 and the second step portion 22 having different pitches, and has excellent gripping properties. Can be formed.

  In addition, since the spirals R1 and R2 along the winding direction of the fastening tapes T1 and T2 are opposite to each other, the helical twist angles α and β formed by the first step portion 20 and the second step portion 22 respectively. They are formed in opposite directions with respect to the longitudinal direction of the tubular body. For this reason, when the gripping position is moved from the difference in the torsion angles α and β of the first step portion 20 and the second step portion 22, the gripping position is accurately grasped via the amount of movement. Can do.

  Further, since the fastening tapes T1 and T2 are wound from opposite ends, the end surface portions 20b and 22b forming the respective step portions 20 and 22 are directed in opposite directions with respect to the central axis 12a, and the shaft Slip in both directions along the direction can be prevented, and operability can be further improved.

  In addition, since the twist angles α and β of the first step portion 20 and the second step portion 22 are different, the step portions oriented in different directions on the outer peripheral surface of the main body 12 due to the intersection of these step portions. Thus, slippage along the circumferential direction can be prevented. These twist angles α and β can improve the anti-slip effect by allowing the first step portion 20 and the second step portion 22 to intersect within a range of 2 degrees or more and 10 degrees or less.

  6 and 7 show a tubular body 10 according to another embodiment. Since other embodiments or modifications described below are basically the same as the above-described embodiments, the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the fastening tapes T1 and T2 are similarly wound from the tip side along spirals R1 and R2 that are opposite to each other.

  In this case, the end surface portion 20b that forms the first step portion 20 and the end surface portion 22b that forms the second step portion 22 face the same direction along the axial direction. Thereby, the anti-slip | skid effect by end surface part 20b, 22b can be improved.

  In the above description, the tubular body 10 for fishing rods has been described. However, other than this, for example, a tennis racket, a badminton racket, a tubular body used for movement of a golf club shaft, and the like, for example, a ball Tubular bodies used for fishing such as nets and handle rods can be formed.

  DESCRIPTION OF SYMBOLS 10 ... Tubular body, 12 ... Main body, 20, 22 ... Step part, f ... Reinforcing fiber, p ... Synthetic resin.

Claims (4)

A tubular body in which a prepreg sheet impregnated with a synthetic resin in a reinforcing fiber is wound, and a stepped portion is formed on an outer peripheral surface by an fastening tape for fastening these prepreg sheets,
A tubular body having first and second step portions extending spirally on the outer peripheral surface, wherein one of the first step portion and the second step portion is formed at a smaller pitch than the other. .   The tubular body according to claim 1, wherein the helical twist angles formed by the first and second step portions are formed in directions opposite to each other with respect to the longitudinal direction of the tubular body.   The first and second step portions each have an end surface portion formed between the side surface portions that extend in a spiral shape so as to be narrower than the side surface portions, and the end surface portion of the first step portion and the second step portion 3. The tubular body according to claim 1, wherein the end surface portion is disposed in a direction opposite to each other along a longitudinal direction of the tubular body.   The tubular body according to any one of claims 1 to 3, wherein the first step portion and the second step portion intersect each other at an angle of 2.0 to 10.0 degrees.

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