Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1998-05-01
2000-07-11
Pelham, Joseph
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219396, 219411, 264479, 264481, 264339, 264295, B29C 3302, B29C 3306, F27B 902, F27B 910, F27D 1300
Patent
active
060876352
ABSTRACT:
In a method for the arc-like shaping of an extruded profiled strand of plastic material at least a section of the strand is heated in a hot air chamber together with a support ledge disposed in spaced relationship from the profiled strand to a temperature permitting the bending of the profiled strand and the strand is then firmly engaged between a support ledge at the inner compression side and a support profile at the other, that is the tension side of the profile strand to form a package, which is then bent while the temperature at the compression side of the profile strand is higher than the temperature at the tension side thereof to prevent the formation of waves in the profile strand walls. The invention also resides in a heating apparatus, which provides for the temperature difference at opposite sides of the profile strand and includes means for engaging the profile strand during bending.
REFERENCES:
patent: 4092390 (1978-05-01), Mulvany, Jr.
patent: 4786456 (1988-11-01), Witte
Reinbold Bernd
Reinbold Theo
Bach Klaus J.
Pelham Joseph
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