# US 5,804,112 A · Method of co-extruding a blown-film textured liner

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- Number: US 5,804,112 A
- Document ID: US5804112A
- Status: Granted
- Kind: A
- Application number: 08/797,132
- Filed: 1997-02-10
- Granted: 1998-09-08
- Earliest claimed: 1996-04-03
- Assignees: Olympic General Corporation
- Inventors: Jimmy D. Greene
- Web page: https://patentgrep.com/patent/US5804112A

## CPC

- B29C 48/10: flexible, e.g. blown foils
- B29C 48/21: the layers being joined at their surfaces
- B29C 48/32: with annular openings, e.g. for forming tubular articles
- B29C 48/336: {the components merging one by one down streams in the die}
- B29C 65/18: using heated tools
- B29C 65/40: Applying molten plastics, e.g. hot melt (using welding bar {combined with hot gases} B29C65/12; by moulding B29C65/70)
- B29C 66/02: {Preparation of the material, in the area to be joined, prior to joining or welding (B29C66/32 takes precedence)}
- B32B 3/26: characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids {(foam layer B32B5/18; layer of synthetic resin characterised by fillers that create voids or cavities B32B27/205); characterised by an apertured layer}
- B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)}
- B32B 27/08: of synthetic resin
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- E02D 31/004: {Sealing liners}
- B29C 48/0018: {combined with shaping by orienting, stretching or shrinking, e.g. film blowing (B29C48/0017 takes precedence)}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29K 2995/0072: Roughness, e.g. anti-slip
- B32B 2250/03: 3 layers
- B32B 2250/24: All layers being polymeric
- Y10T 428/24355: Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
- Y10T 428/24752: Laterally noncoextensive components
- Y10T 428/24777: Edge feature
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/31938: Polymer of monoethylenically unsaturated hydrocarbon
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- E02D: FOUNDATIONS; EXCAVATIONS; EMBANKMENTS (specially adapted for hydraulic engineering E02B); UNDERGROUND OR UNDERWATER STRUCTURES {(tunnels, tunnelling, mining E21)}
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

A method for forming a blown-film textured liner according to claim 1, wherein a second plug is disposed in said second side passage to partially block the extrusion of said molten thermoplastic material from said second side passage.