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US 5,804,112 AGranted
Method of co-extruding a blown-film textured liner
AssigneeOlympic General Corporation
InventorJimmy D. Greene
Life of this patent
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Abstract
A co-extrusion method for making a blown-film textured liner having a textured surface to provide improved soil gripping properties and smooth untextured edges for improving the integrity of the joint between adjacent liner sheets.
Claims2
A method for forming a blown-film textured liner, comprising the steps of:
- a) extruding molten thermoplastic material through a central passage of a blown-film extrusion die;
- b) extruding molten thermoplastic material containing a blowing agent through a first side passage of a blown-film extrusion die;
- and
- c) extruding molten thermoplastic material containing a blowing agent through a second side passage of a blown-film extrusion die;
- wherein said molten thermoplastic material extruded through said first and second side passages is merged with said molten thermoplastic material in said central passage;
- wherein a textured portion of the blown-film textured liner is formed by action of said blowing agent;
- and
- wherein a first plug is disposed in said first side passage to partially block the extrusion of said molten thermoplastic material from said first side passage.
5 more elements
Dependencies are inferred from the claim text.