Method of blow molding

Details Method of blow molding Method of blow molding

B - Operations, Transporting

29

C

18/533

B29C 49/04 (2006.01) B29C 49/18 (2006.01) B29C 49/76 (2006.01)

Patent

CA 1074970

Abstract of the Disclosure An improved method of blow molding bottles of thermo- plastic material wherein intermittent extrusion apparatus is employed to produce bottles with finished necks free of external blemishes, the method including the steps of intermittently extruding tubular parisons from an annular orifice, enclosing the first tubular parison in a mold that has an interior cavity that defines the bottle and that also de- fines a dome radiating outward from the upper end of the bottle neck, immediately blowing the parison essentially to the shape of the cavity, but as an incident to the blowing of the parison and to the interrup- tion of the extrusion, causing the thermoplastic material to be severed at the extrusion orifice, and immediately shifting the mold enclosed ar- ticle to a shaping station while the article is still at a temperature sufficient for subsequent shaping operations, and at the shaping station finish blowing the article while trimming and at least partially com- pression-molding the neck.

273373

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