Draw-forming of stretchable thermoplastic material into hollow a

Details Draw-forming of stretchable thermoplastic material into hollow a Draw-forming of stretchable thermoplastic material into hollow a

1979-07-30

1981-03-17

Silbaugh, Jan H.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including shaping means comprising fluid pressure contacting...

264554, 264544, 4253241, 4253871, B29C 1704

Patent

active

042564492

ABSTRACT:
Apparatus and method for draw molding elongated hollow articles from thermoplastic material which is desirably stretch moldable plastic sheet or film. The material is draw molded on an elongated mandrel. Draw ring means are operated cooperatively with the mandrel for drawing the thermoplastic material into an elongated hollow article. Gaseous jet stream doctoring means are operated during drawing for controlling the article wall thickness. The material may be drawn through a wiper ring through which the mandrel is moved with the thermoplastic material during draw molding in combination with subjecting the outer surface of the article being drawn to the action of the doctoring jet stream from an annular orifice. Internal fluid conditioning of the mandrel, as well as alternate negative pressure within the article during molding and stripping pressure from the mandrel into the article at conclusion of molding cycle are provided for. The draw molding is effected without clamping the thermoplastic material.

REFERENCES:
patent: 2468697 (1949-04-01), Wiley
patent: 2983955 (1961-05-01), Gajposik
patent: 3105607 (1963-10-01), Edwards
patent: 3337664 (1967-08-01), Lyon
patent: 3342914 (1967-09-01), Edwards
patent: 3349153 (1967-10-01), Beck
patent: 4059380 (1977-11-01), Judeis et al.

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