Method of corrugating a web of thin thermoplastic material...

Details Method of corrugating a web of thin thermoplastic material... Method of corrugating a web of thin thermoplastic material...

B - Operations, Transporting

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18/1053

B31F 1/30 (2006.01) B01J 19/32 (2006.01) B29C 51/10 (2006.01) B29C 53/04 (2006.01) B29C 53/28 (2006.01) F28F 25/08 (2006.01)

Patent

CA 1047724

ABSTRACT OF THE DISCLOSURE Method for continuously forming a corrugated web of ther- moplastic material in which the corrugations extend across the web. The web is first softened by heat and then passed to a molding belt which moves in an endless path while supporting and advancing the web in a longitudinal direction. The molding belt is provided with grooves corresponding to the corrugations in the web. The corru- gations are formed initially by poking the softened web progressive- ly into the grooves without stretching the web to any substantial degree. The thus initially formed corrugations are thereafter drawn into the grooves and retained therein by applying suction to the bottom side of the molding belt.

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