# US 4,399,184 A · Rip resistant net

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- Number: US 4,399,184 A
- Document ID: US4399184A
- Status: Granted
- Kind: A
- Application number: 06/345,148
- Filed: 1982-02-02
- Granted: 1983-08-16
- Earliest claimed: 1982-02-02
- Inventors: George S. Nalle, Jr.
- Web page: https://patentgrep.com/patent/US4399184A

## CPC

- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B29C 48/05: Filamentary, e.g. strands
- B29C 48/07: Flat, e.g. panels
- B29C 48/301: {having reciprocating, oscillating or rotating parts}
- B29C 48/345: Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
- B29C 48/13: Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
- B29C 48/18: the components being layers
- B29L 2028/00: Nets or the like
- B32B 2323/04: Polyethylene
- B32B 2323/10: Polypropylene
- Y10T 428/2925: Helical or coiled
- Y10T 442/186: Comprising a composite fiber
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rip resistant net is produced by the coextrusion of two or more polymers wherein some of each polymer is in every filament of the net.

## Claims

### Claim 1

A net-like structure comprising at least two crossing layers, the first of said layers being a first plurality of parallel filaments and the second of said layers being a second plurality of parallel filaments, said first and second pluralities of filaments intersecting one another and being fused together at each point of intersection, each of the filaments in each of said first and second pluralities of filaments being produced by the co-extrusion of two or more polymers wherein a continuous strip of each polymer is in every filament of the net-like structure.

### Claim 2 (depends on 1)

A net-like structure as recited in claim 1 wherein at least one of said polymers is a non-elastic plastic having a relatively high tensil strength and at least another one of said polymers is an elastomeric material having a relatively lower tensil strength than said non-elastic plastic, the composite filaments of said non-elastic and said elastomeric material providing said net-like structure with rip resistant properties.

### Claim 3 (depends on 2)

A net-like structure as recited in claim 2 wherein said non-elastic plastic is polypropylene.

### Claim 4 (depends on 2)

A net-like structure as recited in claim 2 wherein said non-elastic plastic is polyethylene.

### Claim 5 (depends on 3, 4)

A net-like structure as recited in claim 3 or 4 wherein said elastomeric material is a synthetic rubber, ionometric resin, vinyl, or thermoplastic polyester.

### Claim 6

A net-like structure comprising at least two crossing layers, the first of said layers being a first plurality of parallel filaments and the second of said layers being a second plurality of parallel filaments, said first and second pluralities of filaments intersecting one another and being fused together at each point of intersection, each of the filaments in each of said first and second pluralities of filaments being produced by the co-extrusion of two or more polymers of the same polymer family but with different physical characteristics such as melt index, density or molecular weight, at least two variations of the polymer running the continuous length of every filament of the net structure.