Process for the manufacture of oriented hollow articles made of

Details Process for the manufacture of oriented hollow articles made of Process for the manufacture of oriented hollow articles made of

1975-03-11

1977-09-20

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 99, 264150, 264151, 264161, 264163, 264296, 425527, 425530, 425806, B29C 1707, B29C 1712

Patent

active

040497615

ABSTRACT:
In the manufacture of oriented hollow articles made of thermoplastic material by the steps of extruding a continuous hot tubular parison of thermoplastic material; pre-blowing such parison in a pre-blowing mold to produce preforms having a cylindrical body with a diameter not more than 20% greater than that of the parison; thermally conditioning the resulting preforms at a temperature sufficient to cause orientation of the thermoplastic material when it is being stretched; and effecting a final blow-molding of the thermally conditioned preforms, the mechanical properties of the resulting articles in the vicinity of their base are improved by carrying out the pre-blowing step while holding each parison tightly between two half-molds defining a cavity which has the shape, at the location of the base of the preform, of a quarter sphere of diameter equal to that of the preform, and cutting off the resulting flash by means on an elongated blade having a semicircular cross section and a diameter corresponding to that of the base of the cavity, and mounted at the base of one of the half-molds, the blade traveling against the base of the cavity in a direction perpendicular to the closure plane of the mold.

REFERENCES:
patent: RE23564 (1952-10-01), Hobson
patent: 3763297 (1973-10-01), Del Piero et al.
patent: 3795162 (1974-03-01), Jaeger
patent: 3814783 (1974-06-01), Dardaine et al.
patent: 3873660 (1975-03-01), Reilly et al.
patent: 3900120 (1975-08-01), Sincock

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