Blow molding process and apparatus for producing hollow plastic

Details Blow molding process and apparatus for producing hollow plastic Blow molding process and apparatus for producing hollow plastic

1992-03-11

1994-09-13

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264529, 264540, 425526, B29C 4904, B29C 4916, B29C 4964

Patent

active

053466667

ABSTRACT:
An improved process and apparatus for blow molding of engineering plastic materials, using a mold and an extrusion machine with a die for producing a hollow plastic parison to be partially received in the mold. An extrusion operation and a preblowing operation with air from the die into the parison are concurrently commenced at a high extrusion speed and a low air pressure, with a material remaining in the die being integrated with an upstream portion of a preceding parison prepared in a preceding blow molding run, to complete the downstream parison. The upstream portion has a closed and free lower end prepared in the preceding run. The apparatus is provided with a pinching and cutting device for self-adhering and separating the completed parison above and in the vicinity of the mold to prepare the above mentioned closed free end. In an embodiment, a heater is provided to heat the upstream parison portion immediately after the parison is separated into the upstream portion closed at the free lower end and a downstream portion to be received in the mold for blow molding and until immediately before a next extrusion.

REFERENCES:
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European Search Report of Appln. No. EP 92 10 4268, dated Jun. 17, 1992.
Modern Plastics Encyclopedia 88, Oct. 1987 pp. 203, 205, 206, 228, 230-231, 246, 248, 250.

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