Sizing device for extruded plastic tubing
US4543051A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1982 |
| Grant date | Sep 24, 1985 |
| Priority date | — |
| Expiry date | Dec 14, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/919
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A vat under vacuum bears in its sidewall a sizing sleeve, the cylindrical downstream portion of which includes annular channels interconnected by distribution channels. Injection ducts leave the bottoms of the annular channels and open out in the inside surface of the sleeve. The interior of the sleeve communicates with the interior of the vat via rows of radial suction ducts. During operation, the injection ducts are supplied with water under pressure which forms a film between the outside of the tubing and the inside surface of the sleeve even when the tubing is pressed against that inside surface owing to the partial vacuum prevailing within the vat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.