JP2011131537A - Method for producing fiber-reinforced resin pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and firmly stick the trailing edge of the wound-up cloth of a stock roll to the leading edge of the cloth of a new stock roll. <P>SOLUTION: The method for producing a fiber-reinforced resin pipe comprises the steps of: using the stock roll 20 around which the belt-like cloth 21 comprising a reinforcing fiber is wound in a rolled state; drawing the belt-like cloth 21 out of the stock roll 20; winding the drawn cloth 21 around a core material 1; and curing the resin, with which the cloth 21 is impregnated, to form a tubular member. When the remaining cloth 21 on the stock roll 20 comes to an end, a thermal bonding sheet 30 is stuck to the trailing edge 21b of the wound-up cloth 21 of the stock roll 20 and also stuck to the leading edge 21a of the cloth 21 of another stock roll 20. The thermal bonding sheet 30-stuck portions are heated and pressurized to bond both edges of the cloths 21 to each other through the thermal bonding sheet 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing various fiber-reinforced resin pipes such as a protective member such as an antenna cover, a winding core for films and sheets, or a fluid transport pipe.

  As a method of forming a fiber reinforced resin tube (hereinafter referred to as “FRP tube”), a tubular member is formed by winding a reinforcing fiber spirally around a core material and curing the resin impregnated in the reinforcing fiber. There is an FW method (filament winding molding method) for continuous molding.

  For example, what is shown in FIG. 6 shows a general FRP pipe manufacturing apparatus by continuous forming using the FW method. As shown in the drawing, a plurality of FRP layers and the like are sequentially formed around the core material 1, and the FRP layers are continuously fed in the axial direction without stopping. Then, after passing through the curing furnace 11, if the resin is cured, it is cut into a predetermined length to become an FRP tube.

In this example, a belt-like sheet such as paper 2, a resin film 3 and a nonwoven fabric 4 is spirally wound around the core material 1 and then further reinforced fibers such as a tube circumferential fiber 5 and a tube axial fiber 6. A resin is attached to the core material 1 and wound around the outer peripheral surface of the core material 1, and these resins are heated and cured in a curing furnace 11.
Further, the reinforcing fiber is pulled out intermittently on the pipe circumferential fiber 5 by the pipe circumferential fiber 5 directly wound around the core material 1 and the reinforcing fiber supply device 10. Cut into a predetermined length, the cut tube axis direction fibers 6 are overlapped with the tube circumferential direction fibers 5 in a lattice shape to form a belt-like cloth 7, and the belt-like cloth 7 formed of the reinforcing fibers is formed around the core material 1. It is wrapped around. In addition, the code | symbol 8 in a figure is a resin supply apparatus, and the code | symbol 9 is a resin tank (for example, refer patent document 1).

Another example of a method for manufacturing an FRP pipe by the FW method is shown in FIG.
This method is also called a TW method (tape winding molding method), and without using the reinforcing fiber supply device 10, a roll raw fabric 12 in which a reinforcing fiber cloth 7 formed in a belt shape is wound in a roll shape in advance. Is used.

  The band of the cloth 7 is impregnated with resin, wound around the core material 1 and cured, and then the core material 1 is removed to produce a cylindrical FRP pipe. This TW method is also applicable to continuous molding as shown in FIG.

  Further, when the band of the reinforcing fiber cloth 7 is wound around the core material 1 and the cloth 7 of the raw roll 12 is lost, as shown in FIG. The rear end of the cloth 7 and the front end of the cloth 7 of the new roll 12 are overlapped by a length corresponding to the circumference around the core material 1 or more. By immersing in the resin P accumulated in the resin tank 13 in the stacked state, the old and new cloths 7 are joined with the resin P by the viscosity of the resin P, and in this state, the winding can be continued without stopping the apparatus. It has become.

  In addition, when joining the rear end of the fabric 7 at the winding end portion of the roll raw fabric 12 and the leading end of the fabric 7 of the new roll original fabric 12, a technique using heat joining with a hot gun or high-frequency joining is disclosed. (For example, refer to Patent Document 2). Also, a technique using an adhesive film or an adhesive is disclosed (for example, see Patent Document 3).

JP 2000-289117 A JP 2008-143087 A (7th page, FIG. 2 to 8th page, FIG. 5) JP-A-3-110108 (page 5, upper left third line to upper right ninth line)

  According to the technique shown in FIG. 5 (b), when the rear end of the roll 7 at the end of the roll 12 and the front end of the new roll 12 are overlapped, the impregnation of the resin P is not caused. If it is sufficient, a slight amount of air may be present between the two, and the air may become bubbles in the finished state of the FRP tube, which may cause a peeling portion in the FRP tube. . For this reason, it is not preferable that air bubbles are formed at the joint of the cloth 7.

  Moreover, according to the joining using the hot gun and high frequency generator of patent document 2, an adhesion | attachment site | part will not become continuous over the overlapping part whole surface of cloth. That is, since it becomes a spot-like adhesive portion composed of a set of points, it is not possible to completely eliminate the presence of air in the overlapping portion of the cloth.

  In this respect, according to the technique of the adhesive film and the adhesive of Patent Document 3, since it can be bonded over the entire overlapping portion of the cloths, the generation of bubbles is easily suppressed. However, in the bonding with an adhesive film or an adhesive, the adhesive force between the cloths may be insufficient.

  In view of this, an object of the present invention is to enable easy and strong bonding between the rear end of the roll at the end of the roll original fabric and the front end of the new roll original fabric.

  In order to solve the above-described problems, the present invention applies a thermal adhesive sheet to the rear end of the roll at the end of the roll raw fabric and the front end of another roll raw fabric to be used next. By heating the portion addressed to the thermal adhesive sheet from the outside of the cloth and applying pressure, the cloths are joined to each other through the thermal adhesive sheet.

  In the case of a heat-bonding sheet, the bonding site is continuous in a plane, so that air can be excluded from the overlapped portion of the cloth. Moreover, by applying pressure when heating the heat-bonding sheet, it is possible to solve the shortage of adhesive force between the two.

  Specifically, a roll raw fabric obtained by winding a belt-like cloth composed of reinforcing fibers into a roll shape is used, the belt-like cloth is pulled out from the roll raw fabric, and the cloth is wound around the core material. In a method for manufacturing a fiber reinforced resin tube in which a tubular member is formed by curing a resin impregnated in a cloth, when the remaining cloth of the roll material becomes less, after the cloth at the end of the roll of the roll material The thermal adhesive sheet is applied to the end and the tip of the cloth of another roll raw fabric, and a portion of the thermal adhesive sheet is heated and pressure is applied to the fabrics through the thermal adhesive sheet. It is a manufacturing method of the fiber reinforced resin pipe | tube which joins.

When joining the fabrics using this thermal bonding sheet, it is possible to temporarily stop the winding of the fabric around the core material and perform the joining operation, but continue the winding of the fabric around the core material. However, it is also possible to perform the joining.
In other words, when the remaining roll fabric becomes less and the end of the roll is approaching, all the remaining fabric is pulled out of the roll and pulled out by winding it around the core. Until the remaining cloth disappears, the joining operation of the trailing edge of the pulled-out cloth and the leading edge of the new roll is completed.

In this configuration, when the portion to which the thermal adhesive sheet is addressed, that is, the portion where the cloth and the thermal adhesive sheet are overlapped is heated and pressure is applied, the thermal adhesive sheet and the cloth are fused. Can be adopted.
As a material that can fuse the heat bonding sheet and the material of the cloth, for example, when a polyester non-woven fabric is used as the base material of the heat bonding sheet, a combination of woven reinforcing fibers as the material of the cloth is adopted. A combination etc. are mentioned.

  Moreover, in each of these configurations, when heating and applying pressure to the portion addressed to the thermal adhesive sheet, a flat pair of plates that can sandwich the portion where the thermal adhesive sheet is interposed from both the front and back sides A pressing means having a surface and capable of heating at least one of the pair of plate surfaces can be used. Only one of the pair of plate surfaces may be in a heated state, or both may be in a heated state. For example, one plate surface of the pressing means can be a pressing surface of an electric iron.

  Note that this heated state means a temperature equal to or higher than the temperature at which the thermal bonding sheet can exert a predetermined bonding force between the cloths, and if the above-mentioned fusion is expected, By the relationship between the adhesive sheet and the material of the cloth, it refers to a temperature equal to or higher than the temperature at which fusion occurs between them.

  In the present invention, a thermal adhesive sheet is applied to the rear end of the roll at the end of the roll raw fabric and the tip of another roll raw fabric to be used next, and the portion to which the thermal adhesive sheet is applied By heating and applying pressure, the fabrics are joined to each other via the thermal adhesive sheet, so that the bonded part becomes continuous over the entire surface, eliminating the presence of air at the joints between the fabrics. it can. Moreover, by applying pressure when heating the heat-bonding sheet, it is possible to solve the shortage of adhesive force between the two.

The schematic diagram which shows one Embodiment and shows a normal working state The schematic diagram which shows one Embodiment and shows the state from which the remainder of the cloth of the roll original fabric has decreased The schematic diagram which shows one Embodiment and shows the state which pulled out all the cloths of the roll raw material which has decreased remaining The schematic diagram which shows one Embodiment and the state which joined the cloth of another new roll original fabric Schematic diagram showing the state of joining the roll fabric and another roll fabric The joint part of a roll original fabric and another roll original is shown, (a) is a top view, (b) is a front view. The front view which shows the modification of the junction part of the cloth of roll original fabric, and another roll original fabric It is explanatory drawing of a prior art example, (a) is a schematic diagram which shows the process by which the strip | belt-shaped cloth pulled out from the roll raw fabric is immersed in the resin tank, and is wound around a core material, (b) is a roll raw material. Schematic diagram showing the process of joining the fabric at the end of the anti-winding to the tip of another roll fabric Front view showing a general example of continuous forming by filament winding forming method

  Embodiments of the present invention will be described with reference to the drawings. This embodiment relates to a method for molding a fiber reinforced resin pipe (FRP pipe) by a continuous molding method of the FW method.

  In this example, as shown in FIG. 1 a, a plurality of raw rolls 20 obtained by winding a belt-like cloth 21 made of reinforcing fibers into a roll shape are used, and a plurality of cloths 21 drawn from the respective roll raw rolls 20 are used. Use in layers.

  In this example, two rolls 20 are used at the same time, and two sheets of cloth 21 are used. However, depending on the application, three or more rolls 20 are used at the same time. You may use the cloth of a pile. Alternatively, only one cloth 21 may be wound around the core material 1 alone.

  When the cloth 21 is wound around the core material 1, the belt-like cloth 21 drawn out from each roll raw fabric 20 is hidden in the resin tank 13 containing the resin P. Thereby, the cloth 21 is impregnated with the resin. The cloth 21 impregnated with the resin is spirally wound around the core material 1.

  At this time, since each roll original fabric 20 is rotatably attached to the support base, if the fabric 21 is pulled, the fabric 21 is pulled out by the amount of the pull as the roll original fabric 20 rotates. Yes. When the paper wound around the core material 1 rotates around the axis, the cloth 21 of the roll raw fabric 20 is pulled while the cloth 21 is wound around the paper.

  The cloth 21 in which the cloth 21 is wound around the core material 1 is sent out in the axial direction of the core material 1. Then, the resin is cured by passing through the curing furnace 11. Finally, the cured FRP layer and paper are cut into a predetermined length, and a fiber reinforced resin tube (FRP tube) is formed. These points are as described in the conventional example.

  When the remaining amount of the fabric 21 wound around the roll original fabric 20 is reduced, the remaining fabric 21 is pulled out from the roll original fabric 20 and slackened as shown by arrows in FIG. Is folded as shown in the figure.

  Moreover, the cloth 21 of another new roll original fabric 20 is prepared, and it is rotatably attached to a support stand.

  Next, as shown in FIG. 1 c, the rear end 21 b of the roll 21 at the end of the roll 20 is placed on the plate surface 41 of the frame of the pressing means 40.

  During this time, the wrapping of the cloth 21 around the core material 1 is continued, and the pulled-out cloth 21 is gradually wound around the core material 1, and the cloth folded on the slack portion 22 decreases.

A thermal bonding sheet 30 is affixed to the tip 21 a of the cloth 21 of another new roll 20. In this example, one end of the thermal bonding sheet 30 is bonded to the leading end 21 a of the cloth 21 of the new raw roll 20, and the other end projects from the leading end 21 a of the cloth 21.
In this embodiment, the thermal bonding sheet 30 employs a configuration in which “Kureha Tech LNS0020 (polyamide)” as an adhesive and “polyester nonwoven fabric” as a base material are combined. The cloth 21 uses “Kurabo S-1 317.5 mm × 500 m glass: NCR basis weight: 120 g / m 2 count: 600 TEX”.

  The tip 21 a of the cloth 21 is placed on the plate surface 41 of the gantry of the pressing means 40. Then, the other end of the thermal bonding sheet 30 is attached to the rear end 21b of the cloth 21 at the end of winding as shown in FIG. 1d. As shown in FIGS. 3 (a) and 3 (b), the front end 21a and the rear end 21b of the cloth 21 are in a state of having no gap or facing each other with a slight gap therebetween. The sheet 30 is fixed.

  On the plate surface 41, the portion where the thermal adhesive sheet 30 is interposed is heated from above the fabric 21 and pressure is applied in the direction in which both are in close contact, thereby joining the fabrics 21 via the thermal adhesive sheet 30. To do.

An electric iron 43 is used for this heating and pressure application. As shown in FIG. 2, the flat pressing surface 43 a of the electric iron 43 is directed to the surface of the cloth 21 placed on the plate surface 41 of the gantry, and the electric iron 43 is directed toward the plate surface 41. Press. At this time, the electric iron 43 is in a heated state, that is, already heated to a predetermined temperature by energization.
By this pressing, the thermal bonding sheet 30 exhibits a predetermined bonding performance, and the cloths 21 can be bonded to each other.

  Thus, in this manufacturing method, the joining work of the rear end of the pulled-out cloth and the front end of a new roll is completed until the cloth 21 of the slack portion 22 is lost. If the cloth 21 of the slack portion 22 disappears, the cloth 21 of the new raw roll 20 is supplied thereafter.

  4 may be considered as a modified example of the joint portion between the rear end 21b of the fabric 21 at the winding end portion of the roll original fabric 20 and the tip 21a of the fabric 21 of another new roll original fabric 20.

In this modified example, the rear end 21b of the fabric 21 at the end of winding of the raw roll 20 and the front end 21a of the cloth 21 of another roll 20 are overlapped within a predetermined length, and the overlap is performed. The thermal bonding sheet 30 is interposed between the cloth 21 and the cloth 21.
Thus, how the fabrics 21 are joined together using the thermal bonding sheet 30 can be freely selected according to the specifications required for the FRP pipe.

  Further, in this embodiment, the electric iron 43 is used as a heating and pressing tool of the pressing means 40. However, any other means can be used as long as it has a function capable of heating and pressing a portion where the thermal bonding sheet 30 is interposed. You may employ | adopt the press means 40 which consists of these structures.

  In particular, when a portion where the thermal adhesive sheet 30 is interposed is heated and pressure is applied to the joint between the cloths 21, the flat pair of plate surfaces 41 that can sandwich and press the portion where the thermal adhesive sheet 30 is interposed. , 42, and both or one of the pair of plate surfaces 41, 42 can be heated.

  However, as long as a predetermined pressing force against the thermal bonding sheet 30 and the cloth 21 can be secured and a predetermined heating can be exerted on the thermal bonding sheet 30, the configuration of the pressing means 40 is a flat pair of plate surfaces 41. , 42, and other heating and pressing tools, for example, a configuration in which the pair of plate surfaces 41, 42 have irregularities may be employed.

  In addition, when the portion where the thermal bonding sheet 30 is interposed is heated and pressure is applied, the material of the thermal bonding sheet 30 or the reinforcing fiber cloth 21 is selected so that the thermal bonding sheet 30 and the cloth 21 are fused. It is also effective for strengthening the bonding force.

DESCRIPTION OF SYMBOLS 1 Core material 2 Paper 3 Resin film 4 Nonwoven fabric 5 Pipe circumference direction fiber 6 Pipe axis direction fiber 7 Cloth (grid-like fiber)
DESCRIPTION OF SYMBOLS 8 Resin supply apparatus 9 Resin tank 10 Reinforcement fiber supply apparatus 11 Curing furnace 12, 20 Roll raw fabric 13 Resin tank 21 Cloth (grid-like fiber)
21a Front end 21b Rear end 30 Thermal adhesive sheet 40 Press means 41, 42 Plate surface 43 Iron 43a Press surface

Claims (4)

Using a roll original fabric (20) obtained by winding a belt-like cloth (21) composed of reinforcing fibers into a roll shape, the belt-like cloth (21) is drawn from the roll original fabric (20), and the cloth (21) In the method of manufacturing a fiber reinforced resin tube, a tubular member is formed by winding a resin around the core material (1) and curing the resin impregnated in the cloth (21).
When the fabric (21) of the roll original fabric (20) is reduced, the rear end (21b) of the roll (21) at the winding end of the roll original fabric (20) and another roll original fabric (20 The thermal adhesive sheet (30) is applied to the tip (21a) of the cloth (21), and the thermal adhesive sheet (30) is heated by applying pressure to the thermal adhesive sheet (30). The manufacturing method of the fiber reinforced resin pipe | tube which joins cloth (21) through (30).   The heat-adhesive sheet (30) and the cloth (21) are fused when the portion to which the heat-adhesive sheet (30) is applied is heated and pressure is applied. The manufacturing method of the fiber reinforced resin pipe of description.   When heating and applying pressure to the portion addressed to the thermal adhesive sheet (30), a pair of flat plate surfaces (41, 41) that can sandwich the portion addressed to the thermal adhesive sheet (30). 42), and pressing means (40) capable of bringing at least one of the pair of plate surfaces (41, 42) into a heated state is used. Method.   The method for producing a fiber-reinforced resin pipe according to claim 3, wherein one plate surface (42) of the pressing means (40) is a pressing surface (43a) of an electric iron (43).

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