Device for manufacture of hollow articles

Details Device for manufacture of hollow articles Device for manufacture of hollow articles

1977-06-24

1983-01-11

Briggs, William R.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

With means to sever product

425296, 425531, 425533, 425553, B29D 2300

Patent

active

043680275

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 of an elongated blade having a semi-circular 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: 3632262 (1972-01-01), Johnston
patent: 3763297 (1973-10-01), Piero et al.
patent: 3777609 (1973-12-01), Michel
patent: 3795162 (1974-03-01), Jaeger
patent: 3814783 (1974-06-01), Dardaine et al.

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