Patent ID: 6660217
Filing Date: 2003-12-09
Classification: B29C

Abstract:
A blow molding method for forming a hollow resin product, the method comprising the steps of:Extruding a parison from a die head towards a position interposed between first and second molding portions, wherein said first molding portion has a first mating surface and a first annular-shaped parison-cutting-protrusion erected from said first mating surface, and said second molding portion has a second mating surface and a second annular-shaped parison-cutting-protrusion erected from said second mating surface; abutting said first and second annular-shaped parison-cutting-protrusions while closing said first and second molding portions tightly, thereby defining a molding chamber by said first and second annular-shaped parison-cutting-protrusion; and abutting a plurality of first confronting rods with a plurality of second confronting rods respectively at the same time of the abutting step of the first and second annular-shaped parison-cutting-protrusions, wherein said first confronting rods are protruded from the first mating surface of the first molding portion and disposed outside said first annular-shaped parison-cutting-protrusion in a radial direction of said first molding portion, and said second confronting rods are protruded from the second mating surface of the second molding portion and disposed outside said second annular-shaped parison-cutting-protrusion in a radial direction of said second molding portion.