Method of Producing a Coextrusion Blown Film
AssigneeAlros Products Limited
InventorsJae BAIK, Elvio Cavicchia
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Abstract
This invention relates to a method of producing a coextrusion blown film is described. The method involves coextruding a blown film having 3 to 11 layers, including a first skin layer and a second skin layer, the first skin layer comprising nylon, and the second skin layer having a different melting temperature than the first skin layer. The film is then cooled before being passed through steam. The method can be used to produce a coextrusion blown film that has reduced curling.
Claims20
1) A method of producing a coextrusion blown film, the method comprising:
- coextruding a blown film having 3 to 11 layers, including a first skin layer and a second skin layer, the first skin layer comprising nylon, and the second skin layer having a different melting temperature than the first skin layer;
- cooling the film;
- and
- passing the film through steam.
18) A method of producing a coextrusion blown film, the method comprising:
- coextruding a tubular film having 3 to 11 layers, including a nylon skin layer forming an outer surface of the tubular film;
- cooling the film, with the nylon skin layer crystallizing before the other layers;
- assessing whether the film is curling;
- and
- if the film is curling, passing the film through steam to reduce the curling.
Dependencies are inferred from the claim text.