GB1472931A - Yarn production method - Google Patents
Yarn production methodInfo
- Publication number
- GB1472931A GB1472931A GB1850974A GB1850974A GB1472931A GB 1472931 A GB1472931 A GB 1472931A GB 1850974 A GB1850974 A GB 1850974A GB 1850974 A GB1850974 A GB 1850974A GB 1472931 A GB1472931 A GB 1472931A
- Authority
- GB
- United Kingdom
- Prior art keywords
- yarn
- filaments
- feed
- draw ratio
- intrinsic viscosity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
- D01G1/06—Converting tows to slivers or yarns, e.g. in direct spinning
- D01G1/08—Converting tows to slivers or yarns, e.g. in direct spinning by stretching or abrading
- D01G1/081—Converting tows to slivers or yarns, e.g. in direct spinning by stretching or abrading with preferential breaking zones
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
1472931 Simultaneously drawing and false twisting multifilament yarn to produce yarn having fibrils UNITIKA Ltd 26 April 1974 [28 April 1973 30 Aug 1973] 18509/74 Headings D1F and D1W A method of producing a yarn resembling a spun yarn comprising simultaneously falsetwisting and drawing a "feed yarn" at an elevated temperature and at a draw ratio which is less than the "ultimate draw ratio" of the feed yarn wherein, during false-twisting the feed yarn is twisted so as to have (a) not more than 31000/#D' turns per metre and (b) individual filaments flattened along at least part of the length thereof, whereby at least some of the flattened parts of the filaments are broken during the detwisting step of the false twisting. The factor D' is the number obtained by dividing the total denier of the feed yarn by the draw ratio used, the "feed yarn" is defined as a multifilamentary synthetic thermoplastic yarn each of whose filaments has an elongation at break of at least 80%, and the "ultimate draw ratio" is defined as the draw ratio at breaking. The feed yarn filaments may comprise: a polyester having an intrinsic viscosity of from 0.4 to 1.3 and a birefringance of from 5 x 10<SP>-3</SP> to 40 x 10<SP>-3</SP>; a polyether ester having an intrinsic viscosity of from 0.5 to 0.7 and a birefringance of from 2 x 10<SP>-3</SP> to 35 x 10<SP>-3</SP>; a polyamide, e.g. nylon 6, having an intrinsic viscosity of from 0.9 to 2.1 and a birefringance of from 20 x 10<SP>-3</SP> to 40 x 10<SP>-3</SP>; or a polyacrylonitrile. The intrinsic viscosity of the polyester and polyether ester is as measured in a 1:1 by weight mixed solvent of phenol and tetrachloroethane at 20‹C, and the intrinsic viscosity of the polyamide is as measured in 96% by weight sulphuric acid at 30‹C. The feed yarn may have a circular or hollow cross-section, and may be a ply yarn or a twisted yarn. The feed yarn filaments may have different physical properties, e.g. may have different colour, and may each have a denier of from 1 to 6. There may be 24 filaments in the feed yarn. The feed yarn is drawn between rolls 2, 6, Fig. 3 while being heated at 3 and false twisted at 5, e.g. by a pin twister or by a friction twister. The filaments flattened by drawing are said to be broken in the detwisting zone, and the distance between false twister 5 and rolls 6 may be variable, or a holding point provided, to control breakage. The flattened parts may have cross-sections whose ratio of short to long dimesion is from 1:2 to 1:7. The temperature of heater 3 may lie between the softening point of the filaments and a temperature of two thirds the softening point in degrees belsius. The draw ratio may be 0.80 to 0.90 the ultimate ratio. The coherency or heat stability of the yarn may be improved by false twisting, and heating, by true twisting, or by the application of a fluid vortex flow or a bonding agent. The yarn produced has fibrils within the yarn of irregular length, some of which extend from the yarn. The individual filaments may be crimped and intertwined, and occasionally S and Z twists may exit alternately along the yarn.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4820073A JPS5713645B2 (en) | 1973-04-28 | 1973-04-28 | |
JP9746873A JPS5043251A (en) | 1973-08-30 | 1973-08-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1472931A true GB1472931A (en) | 1977-05-11 |
Family
ID=26388432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1850974A Expired GB1472931A (en) | 1973-04-28 | 1974-04-26 | Yarn production method |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2420737A1 (en) |
FR (1) | FR2227359B1 (en) |
GB (1) | GB1472931A (en) |
IT (1) | IT1004494B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2850854C2 (en) * | 1978-11-24 | 1983-01-20 | Hoechst Ag, 6000 Frankfurt | Process for the production of a voluminous, false-wire-textured filament yarn with individual protruding filament ends |
-
1974
- 1974-04-26 GB GB1850974A patent/GB1472931A/en not_active Expired
- 1974-04-29 FR FR7414900A patent/FR2227359B1/fr not_active Expired
- 1974-04-29 IT IT5067474A patent/IT1004494B/en active
- 1974-04-29 DE DE19742420737 patent/DE2420737A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
FR2227359A1 (en) | 1974-11-22 |
DE2420737A1 (en) | 1974-11-21 |
FR2227359B1 (en) | 1979-02-16 |
IT1004494B (en) | 1976-07-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |