PURPOSE:To form the tank made of FRP by releasing a mandrel without using flux, etc., by a method in which a dividable round bar-mandrel is used for a mandrel, and heat resistant fiber and a tape is wound thereon like the tank, and then it is used as a mandrel. CONSTITUTION:The heat resistant fiber 4 such as metal or ceramic, etc., is wound on the round bar-mandrel divided in the peripheral direction into the shape to be formed. The round bar-mandrel is composed of the rodlike object 1 in the central part, two small members 2 which wind said object 1 and two large member 3 adjacent to said small member, and is constituted so that its outer periphery becomes circular in section. A tape 5 is wound on the surface of a heat resistant layer 4 so that the resin does not enter the gap of the heat resistant fiber 4. Such treatment that the resin does not stick to the tape 5 is applied to the tape. An impregnated fiber 6 is wound on said tape by a filament-winder and is formed. The release is carried out by detaching the barlike object 1 of the divided mandrel and by releasing the small member 2 and the large member 3 in that order. Next, the heat resistant fiber 4 is unwound on a bobbin, and finally the tape 5 is detached. The heat resistant fiber 4 and the end of the tape 5 are exposed outside of a formed object.
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