| 摘要 |
PURPOSE:To obtain the tube whose thermal contraction rate is less in its lognitudinal direction that in its radius direction, by transferring a plural number of tapelike material with contacts on the whole circumference while applying friction forces to the outer circumference of the thermal contractive tube reversely to the dirction in which the consecutive shaping is made. CONSTITUTION:The endless tapelike materials 2 are let pass through the pipes 20 and are driven to the direction represented by arrows being wound around the tube 1a having pressure from inside, between the outer circumference of the tube 1a and preheating inner plate 3 and the inner plate 6 in the cooling tubes. The tube 1a, with pressure from within, are enlarged conically while passing through the heat expansion tube 18, and after the diameter thereof is enlarged they are cooled in the cooling tube 19 with pressure applied thereto from the greatest diameter material and are let out consecutively in the arrowed direction in the form of the thermal contractive tube 1b. |
