B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/00 (2006.01) B29C 37/00 (2006.01) C08J 7/04 (2006.01)
Patent
CA 2366452
A process for making a thermoplastic film by the blown film extrusion process comprises extruding a molten thermoplastic polymer through a tubular die to form a tube of molten polymer, contacting the inner surface of the tube of molten polymer as it exits the die with an aqueous solution of a water-soluble polysaccharide ether, inflating the tube of molten polymer to form a blown tubular film and then collapsing the blown film to a flat web. The thermoplastic film has on its surface a coating of a water-soluble polysaccharide ether.
Cette invention concerne un procédé de fabrication de films thermoplastiques par extrusion-soufflage. Ce procédé consiste à extruder un polymère thermoplastique en fusion via une matrice tubulaire dans le but d'obtenir un tube de polymère fondu, de mettre la surface interne dudit tube, à sa sortie de la matrice, en contact avec une solution aqueuse d'éther de polysaccharide hydrosoluble, de souffler le tube de polymère en fusion pour former un film tubulaire soufflé pour enfin le faire se replier sous forme d'une bande plate. Le film thermoplastique comporte un revêtement d'éther de polysaccharide hydrosoluble sur sa surface.
Debney Martin F.
Kling Susan M.
Kruidenier Rene
Lee Eric K.
Smart & Biggar
The Dow Chemical Company
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