Method and apparatus for forming heat-resistant container

摘要

A heat-resistant container forming method includes a step of thermally shrinking a primary blow molded article (70) in a heating furnace (24A-24E) before secondary blow molding the primary blow molded article (70) into a final product (90) or container. Into the furnace (24A-24E), hot air which flows along the longitudinal direction of the first blow molded article (70) and whose temperature enough to facilitate crystallization of the primary blow molded article (70). The primary blow molded article (70) is thermally shrunk by exposing the entire circumferential surface of a barrel of the primary blow article (70) to the hot air and by blowing the hot air longitudinally along the primary blow molded article (70) to heat the barrel circumferentially uniformly. Since hot air touches the barrel as flowing longitudinally thereof, it is possible to increase the heat conductivity of boundary film of the primary blow molded article (70), without increasing the hot air temperature too high, so that temperature rise of the primary blow molded article (70) is facilitated.