Title: Process for coating webs with polyethylene

Abstract: A process is provided for coating of substrate webs with polyethylene wherein the edge thickening and other processing difficulties caused by the necking-in phenomenon are minimized. The process comprises extruding a polyethylene having a melt index between 30 dg/min and 100 dg/min through a slot in a slotted die in the form of a sheet onto the moving substrate web to form the coated web, and passing the coated web through a nip roll assembly comprising a chill roll and a nip roll, the slotted die having at the extremities of the slot therein edge guides which are maintained at a temperature above the melting temperature of the polyethylene and are contoured to guide the adhered edges of the extruded sheet into the throat of the nip roll assembly.

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Inventors: White, George (Glenburnie, CA)

Application Number: 06/356718
Filing Date: 1982-03-10
Publication_date: 1983-10-04
Assignee: Pont, Canada DU. (CA)

Primary Class(es): 156/244.270 427/398.200, 427/365, 427/361, 427/358
Other Classes: B05C5/00; B05D1/26; B29C47/14; B29C47/86; D06B1/14; B29C47/78; D06B1/00
US Patent Ref:

2894853	July, 1959	Andersson	Method and apparatus for extrusion coating and product
3456293	July, 1969	De Smedt et al.	EXTRUSION APPARATUS
4133710	January, 1979	Wartenberg	427/365	Method for forming a polyethylene layer on a substrate

Other Refs: CA653596GB1346780

December, 1962
February, 1974	427/365

Primary Examiner: Lusignan, Michael R.
Assistant Examiner:
Attorney: Prizzi, John J.

Claims:

I claim: