INFUREESHONSEIKEIYOREIKYAKUSOCHI

摘要

PURPOSE:To increase the cooling effect of fused resin tubular body and to increase the inflation molding speed, by arranging a heat pipe equipped with an evaporation part on the inner peripheral surface of the fused resin tubular body just after being extruded from extrusion die. CONSTITUTION:In the inflation molding apparatus wherein the resin tubular body 6A of fused state extruded from the annular slit 4 of the extrusion die 1 is made the resin bubble 6C by the expansion and thinning wall of it and it is winded after completely solidification by cooling, the cooling heat pipe 10 is provided in the gas-filled tube 9 installed by penetrating the central part of the extrusion die 1. The evaporation part 10A of heat pipe 10 is formed to be of the column having about the same height as that of the expansion part 6B of resin tubular body 6 and the same diameter as that of the tubular body 6A just after extrusion. The condensation part 10B of heat pipe 10 is arranged at a fixed height in the resin bubble 6C and a heat dissipation fin is provided on the outer peripheral part near the upper end of it.