Title: Apparatus for blow molding plastic articles

Abstract: This application discloses a method of and apparatus for blow molding plastic articles in two blowing stages. A freely extruded pendant tubular parison is first blown into a pre-form, then the pre-form, while at a temperature most conducive to orientation, is blown to its final configuration. By performing certain operations on the pre-form prior to the final blowing step, improved products can be made. For example, by pinching shut a portion of the pre-form, handled containers can be made on a free extrusion blow molding machine. By stretching the pre-form prior to final blowing, containers of increased top-load or stacking capability can be made.

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Inventors: Uhlig, Albert R. (Toledo, OH, US)

Application Number: 390551
Filing Date: 1973-08-22
Publication_date: 1976-03-02
Assignee: Owens-Illinois, Inc. (Toledo, OH)
Primary Class(es): 425/530 425/525
Other Classes:
US Patent Ref:

2715751	Aug, 1955	Weber	425/340.
2919462	Jan, 1960	Friden	264/99.
3439380	Apr, 1969	Seefluth	425/DIG.
3470282	Sep, 1969	Scalora	425/326.
3632261	Jan, 1972	Gasior	425/342.
3781395	Dec, 1973	Uhlig	425/326.
3806587	Apr, 1974	Turner	425/DIG.

Other Refs: 795,5431,147,118

Aug, 1973	BE.
Apr, 1969	UK.

Primary Examiner: Whitehead, Harold D.
Assistant Examiner: Ramsey, K. J.
Attorney: Rice; Philip M., Holler; E. J.