Method for controlling the diameter of tubular films made in blow moulding plants
CA 2073285 A1 · Owner: Sensen, Clemens · Inventors: Sandkamper, Horst; Gandelheidt, Edgar; Sensen, Clemens
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for controlling the diameter of tubular films which are manufactured in a blow moulding apparatus comprising an extruder with a film blowing head, an internal cooling means for the blown film, a calibrating means a means for laying the, film flat, and a means for film take-up. The exchanged amount of internal cooling air, the speed at which the extruder supplies plastic to the blowing head, the temperature of the extruded plastic material, the take-up speed, and the external cooling are automatically controlled in response to sensing means. To be able to carry out the control easily and without failure without, having to accurately measure the height of the frost line the, distance …
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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
- Filed July 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2014.
- 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.