The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 1981
Filed:
Jul. 30, 1979
Donald G Sauer, Harwinton, CT (US);
National Can Corporation, Chicago, IL (US);
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.