Thermoplastic twines

• US 4,228,641 A
• Filed: 09/28/1978
• Issued: 10/21/1980
• Est. Priority Date: 09/28/1978
• Status: Expired due to Term

• Current Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Original Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Inventors: O'Neil, John B.
• Primary Examiner(s): Petrakes, John
• Application Number:
  US06/946,888
• Time in Patent Office: 754 Days
• Field of Search: 57/210, 57/216, 57/220, 57/222, 57/234, 57/7, 57/12, 57/907, 156/180, 156/167, 156/148, 264/103, 264/167, 264/174
• US Class Current: 57/234
• CPC Class Codes: D02G 3/38 Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn; D02G3/32 takes precedence; covering endless core threads with fibres by using open-end spinning techniques D01H4/00
• CPC Class Codes: D02G 3/40 Yarns in which fibres are united by adhesives; Impregnated yarns or threads
• CPC Class Codes: D07B 2201/2097 Binding wires
• CPC Class Codes: D07B 2401/2075 externally
• CPC Class Codes: D07B 5/005 characterised by their outer shape or surface properties

Abstract

A twine comprised of a core bundle of synthetic monofilaments twisted along the length of the twine and a synthetic binder material in thin band form spirally wound about the monofilaments in a direction opposite to the core bundle twist has been found to form knots of superior strength which are less susceptible to slippage while maintaining good flexibility. A further embodiment comprises the bundle of twisted monofilaments and a synthetic binder in thin band form spirally wound in the direction of the core bundle twist so as to provide a flat twine useful as cable filler.

Claims

1. A twine comprising a core bundle of continuous synthetic oriented monofilaments extending lengthwise of the twine and twisted so as to contain from 0.3 to about 3.0 turns per linear inch of monofilament twine and a synthetic binder in thin band form made from a material compatible with the monofilaments material, spirally wound in a direction reverse to the core bundle twist, and containing from about 8 to 30 spirals per linear foot of twisted monofilaments, the spirally wound band being adhered to the outer monofilaments along the length of the twisted core bundle.

2. The twine of claim 1 wherein the core bundle contains from 40 to 340 monofilaments.

3. The twine of claim 2 wherein the core bundle contains from 95 to 195 monofilaments.

4. The twine of claim 1 wherein the core bundle of monofilaments is spirally encapsulated while in a false twisted condition.

5. The twine of claim 1 or 4 wherein said core filaments are twisted so as to contain from about 0.5 to 1.5 turns per linear inch of monofilament twine.

6. The twine of claim 5 wherein said core filament contains about 6 turns per linear foot of monofilaments and said spiral band contains about 10 to about 16 spirals per linear foot of monofilaments.

7. The twine of claim 1 wherein the synthetic monofilaments and spiral binder are thermoplastic resins, including polyolefins, polyamides, polyesters, polycarbonates and polyvinyl types.

8. The twine of claim 7 wherein the thermoplastic resins are polyolefins and the binder one of thermoplastic polyolefin resins or thermoplastic rubber.

9. The twine of claim 8 wherein the polyolefins are selected from the group consisting of polypropylene, polyethylene and copolymers of ethylene and propylene.

10. The twine according to claim 7 wherein the monofilaments and spiral binder are polypropylene.

11. The twine of claim 1 wherein said monofilaments have a denier of about 50 to 1000 and the twine is in the range of about 5000 to 50,000 denier and the denier of the spiral band is in the range of 10% to 25% of the denier of the total twine denier.

12. The twine of claim 11 wherein said twine is in the range of about 20,000 to 40,000 denier, said monofilaments are about 200 denier and the denier of the spiral band is about 15% of the total twine denier.

13. The twine of claim 1 wherein the spiral band is foamed.

14. The twine of claim 13 wherein the spiral band contains a gas dispersed therein at about 16 to about 66% of volume based on the volume of the resin.

15. The twine of claim 1 wherein the monofilaments and spiral band are foamed.

16. The twine of claim 15 wherein the monofilaments and band contain a gas dispersed therein at about 16 to about 66% by volume based on the volume of the resin.

17. The twine of claim 13 or 15 wherein the gas is present at about 32% by volume based on the volume of the resin.