Blow molding method

Details Blow molding method Blow molding method

1983-03-08

1984-10-16

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264542, 425529, 425532, 425538, B29C 1707

Patent

active

044774087

ABSTRACT:
A blow molding method for forming a chain of hollow, shaped article bodies of biaxially oriented, normally highly crystalline thermoplastic material from a tube of the material in substantially unoriented condition, but at its orientation temperature, which includes pulling the tube from a first point to a second point, and pushing beyond the second point that portion of the chain formed between the two points; braking the travel of the tube past the first point during at least part of the time it is being pulled, whereby the part of the tube between the points becomes stretched; closing the corresponding mold pieces of a plurality of stationary blow molds on the stretched part of the tube; inflating the portions of the stretched part of the tube within the mold cavities defined by the corresponding mold pieces to form in each the mold cavity one of the bodies, and to biaxially orient the material thereof; and sequentially opening the mold pieces, following the inflating, to minimize snap-back of the chain.

REFERENCES:
patent: 2790994 (1957-05-01), Cardot et al.
patent: 3541189 (1970-11-01), Yoshikawa et al.
patent: 3844700 (1974-10-01), Sokolow

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