Process and apparatus for extruding thermoplastic material
CA 1058366 A · Owner: Montedison S.P.A. · Inventors: Movilli, Walter; Giannarelli, Giancarlo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a machine and process for extruding particular shapes in thermoplastic material and more, precisely, flat plates, corrugated plates and the like or in, general, shapes having one section much larger than the other. The process is particularly suited to eliminate the uneven feed of the molton material coming out from a die. In the process of the invention, the molten material discharged from an extrusion head is subdivided among a number of separate flow tubes which have cross sections and lengths such that the same pressure drop is created in the material flowing through each tube. The tubes are maintained at a predetermined temperature and are positioned to …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 17, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 17, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.