Apparatus for forming a parison

Details Apparatus for forming a parison Apparatus for forming a parison

1974-12-10

1976-09-21

Shore, Ronald J.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Core, pin or insert member

425380, 425DIG206, B29D 2304

Patent

active

039816729

ABSTRACT:
A die for passing blow-moldable plastic material through an annulus of the die for forming a parison adapted for forming a molded article of substantially uniform wall thickness. During forming of the material in the die, first and second areas of increased wall thickness are formed on the material, the thickened portions only are thereafter progressively decreased in thickness to form a uniform cross-section and thereafter the material is discharged from the die.

REFERENCES:
patent: 2780835 (1967-02-01), Sherman
patent: 2987766 (1961-06-01), Porter
patent: 3309443 (1967-03-01), Scott et al.
patent: 3315307 (1967-04-01), Hurd et al.
patent: 3583033 (1971-06-01), Christofas et al.

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