Tubular body manufacturing method and tubular body

摘要

The present invention relates to a method of manufacturing an FRP tubular body. The manufacturing method includes the steps of winding a fiber reinforced resin member containing a fiber and a matrix resin around a mandrel, thereby obtaining an intermediate formed body, winding a wrapping tape around an outer peripheral surface of the intermediate formed body (6) with an application of a tension, curing the matrix resin in the intermediate formed body having the wrapping tape wound therearound, and pulling the mandrel out and removing the wrapping tape after the curing step, thereby obtaining a cured tubular body. It is preferable that a fabric tape should be used as the wrapping tape. It is preferable that a tensile stress to be applied to the fabric tape (8) should be set to be equal to or higher than 5 (Mpa) and is equal to or smaller than 150 (Mpa) at the tape winding step. In the manufacturing method, the matrix resin can be effectively extracted at a subsequent step to the winding step.

主权项

1. A method of manufacturing a tubular body formed by a fiber reinforced resin, wherein said manufacturing method is a sheet winding process comprising the steps of:
winding a fiber reinforced resin member containing a fiber and a matrix resin around a tapered mandrel, thereby obtaining an intermediate formed body having a fiber content equal to or higher than 70% by weight; winding a wrapping tape around an outer peripheral surface of the intermediate formed body with an application of a tension, wherein an independent fabric tape is used as the wrapping tape and the fabric tape is directly wound around the outer peripheral surface of the intermediate formed body in this tape winding step; heating the intermediate formed body having the wrapping tape wound therearound in a first stage at a temperature of 60 to 115° C. for 10 to 120 minutes and in a second, subsequent stage at 120 to 200° C. for 60 to 240 minutes, thereby curing the matrix resin; and pulling the tapered mandrel out and removing the wrapping tape after the curing step, thereby obtaining a cured tubular body, wherein when a fiber content of the intermediate formed body is represented by Z1 (% by weight) and a fiber content of the cured tubular body is represented by Z2 (% by weight), a difference (Z2−Z1) is equal to or greater than 3% by weight and is equal to or smaller than 25% by weight, and wherein the wound wrapping tape has an overlapping portion in which the fabric tapes overlap each other, and wherein the fabric tape has a void or a hole between woven fibers, whereby the resin contained in the fiber reinforced resin member can be moved to the void or the hole of the fabric tape in the manufacturing process.