Patent attributes
To provide a metal mold for forming a preform decreasing the hitting of metal molds at a portion where a slide insert metal mold and a cavity metal mold undergo the sliding yet maintaining the pressure. The metal mold (33) for forming the preform includes a slide insert metal mold (36) split into at least two for forming at least a nozzle portion of the preform, wherein a pressure is maintained by using a fitting portion which includes a preform-forming portion of the slide insert metal mold (36) coupled together from the split state and a cavity metal mold (34). Auxiliary fitting portions (40a, 40b) where the slide insert metal mold (36) and the cavity metal mold (34) undergo the sliding is formed at a position of not forming the preform separate from the fitting portion that includes the preform-forming portion.
