| 摘要 |
PURPOSE:To obtain an apparatus for manufacturing heat-shrinkable tubes with marks of suction pores little visible by, providing a tubular body having numerous pores of a molding cylinder, tight on the inner wall thereof piercing the inside thereof. CONSTITUTION:A tubular body 6 having numerous pores is arranged on the internal surface, tight on the internal wall of a molding cylinder 2 of a heat- shrinkable tube manufacturing apparatus with the diameter thereof smaller than that of pores 21 of the molding cylinder piercing the inside thereof. An original pipe is put into the apparatus and fixed by closing lid sections 3 and 3'. The original pipe may be heated beforehand or in the apparatus. A vacuum exhaust mechanism 4 operates immediately to make the clearance part in an outer tube 1 vacuum and the original pipe heated soft is expanded. During the expansion of the pipe, the pipe being molded is evenly sucked throughout the pipe so that the outer surface of the heat-shrinkable tube thus obtained becomes smooth considerably thereby assuring excellent appearance and performance as product. |
