GB2367307A - A yarn strengthening method and apparatus - Google Patents
A yarn strengthening method and apparatus Download PDFInfo
- Publication number
- GB2367307A GB2367307A GB0120694A GB0120694A GB2367307A GB 2367307 A GB2367307 A GB 2367307A GB 0120694 A GB0120694 A GB 0120694A GB 0120694 A GB0120694 A GB 0120694A GB 2367307 A GB2367307 A GB 2367307A
- Authority
- GB
- United Kingdom
- Prior art keywords
- yarn
- core
- stitch base
- guide grooves
- guide groove
- 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.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H18/00—Needling machines
- D04H18/02—Needling machines with needles
-
- 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
- D02G3/36—Cored or coated yarns or threads
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Nonwoven Fabrics (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
An apparatus and method for strengthening a yarn 6, with a core zone 11 and a sheath zone 12, by needling fibres from the sheath zone through the core zone comprises a reciprocatingly drivable needle board 2 and a stitch base 1 provided with guide grooves 5 for the yarn. The guide grooves extend in the direction of passage of the yarn and the needles 4 penetrate the guide grooves. The stitch base may extend in a convexly curved manner in the direction of the guide grooves do that the yarn is maintained in tension.
Description
I 2367307 A method and an apparatus for strengthening yarns
Field of the Invention
The invention relates to a method for strengthening a yarn which is provided with fibers at least in a sheath zone enclosing the core zone, Description of the Prior Art
The strength of fibers which are provided with a sheath zone made of fibers which enclose the core zone depends, among other things, on the anchoring of the enveloping fibers in the yarn core. If the yarn is obtained by a twisting of a fiber slubbing, the enveloping fibers are usually well incorporated in the fiber structure as a result of the twisting of the slubbing. If a yarn core is wrapped around with fibers, the connection between the enveloping fibers and the yarn core remains limited to the friction between the enveloping fibers and the surface of the yarn core, thus giving rise to the likelihood that in the case of a respective load, the fiber sheath may be displaced against the yarn core in the longitudinal direction of the yarn. This can lead to a dissolution of the yarn structure, especially whenever the enveloping fibers are provided with a relatively loose connection among one another. The yarn strength also suffers by stresses placed on the yarn which are accompanied by an untwisting of the twist of the yarn.
Summary of the Invention
The invention is thus based on the object of mechanically strengthening a yarn of the kind mentioned above with the help of a comparably simple method, so that not only higher strength requirements can be met, but also the likelihood of an untwisting of the twist of the yarn can be avoided.
The invention achieves the above object in such a way that fibers are needled from the sheath zone through the core zone along the yarn.
Since as a result of this measure the enveloping fibers are anchored additionally in the core zone of the yarn, the mutual connection between the enveloping fibers and the core zone of the yarn is strengthened considerably, which has a direct influence on the yarn strength since the needling of enveloping fibers through the core zone of the yarn produces a fixing of the twist of the yarn. This means that yarns with a predetermined degree of twisting are provided with better strength properties or that a lower twist of the yarn is required for a required yarn strength. This applies to yarns from twisted fiber slubbings, but especially to yarns with a fiber sheath wound about a yarn core, because in this case a mutual connection, which otherwise would not be possible, can be achieved between the enveloping fibers and the yarn core. An additional aspect is that the condensation of the fiber structure which is caused by the needling leads to a certain compensation of thick and thin places, which is disclosed by an even yarn quality.
In order to perform the needling of yarns, it is possible to assume a conventional apparatus with a drivable needle board reciprocating in the direction of the needle penetration and a stitch base opposite of the needle board. It is merely necessary to ensure that the needles are disposed behind one another in the traveling direction of the yarn and the yarn cannot escape the penetrating needles to the side. For this reason the stitch base is provided with at least one guide groove for the yarn which extends in the direction of yarn passage, with the needles of the needle board penetrating into the guide groove. The side walls of the guide groove, which can be formed by a groove in the stitch base or guide rules provided on the stitch base, prevent a lateral migration of the yarn to be needled, so that the needles need merely be disposed in one row on the needle board in the direction of the guide groove in order to needle the yarn pulled through the guide groove in such a way that the enveloping fibers are pulled through the core zone of the yarn. The enveloping fibers extending through the core zone to the opposite sheath zone substantially prevent any relative movements between the sheath and core zones, T so that a yarn needled in this manner is provided not only with favorable strength values, but is also advantageously protected against untwisting.
Since the desired unity of the fiber structure between the sheath and the core zones of a yarn requires a comparably low stitching density, the passage speed of the yarns to be needled can be kept relatively high in the apparatuses provided for such purposes, which allows a favorable adaptation to the working speed of downstream yarn treatment. In order to enable the simultaneous needling of several yarns, the stitch base can be provided with several parallel guide grooves for one yarn each. The smooth entry and exit of the yarns into and out of the guide grooves can be enforced in a simple way by guide eyes for the yarns.
In order to obtain a lateral guidance within the guide groove which is advantageous for the needling of a yarn, the clearance of the guide groove can decrease in the direction of needle penetration so that the yarn, depending on its respective thickness, rests on the two side walls of the guide groove when the yarn to be needled is pulled into the guide groove. For this purpose the stitch base can be provided with a convexly arched arrangement at least in the entrance and exit zones, so that in the case of a tensile stress on the yarn to be needled, a force component is obtained which presses the yarn against the stitch base in the guide groove. If the curvature extends over the entire length of the guide groove, this effect is also extended to the needling zone with the advantage that the needlepenetration angle of the needles into the yarn changes along the guide groove, which influences the strength properties accordingly. This effect of the curvature of the stitch base is naturally not dependent on any special arrangement of the cross section of the guide groove which in the case of low requirements placed on the lateral guidance of the yarn can also have a rectangular cross section.
Although a convex stitch base causes a force component which is perpendicular to the stitch base in the case of a respective tensile load of the yarn which presses the yarn against the stitch base, the provision of a stripper between the stitch base and the needle board is recommended because in this way it is possible to achieve a substantially calmed yarn guidance with a simultaneously lower yarn tension.
Brief Description of the Drawings
The method in accordance with the invention is now explained in closer detail by reference to the enclosed drawing, wherein:
Fig. 1 shows an apparatus in accordance with the invention for strengthening a yarn in a simplified, partly sectional side view; Fig. 2 shows a sectional view along line 11-11 of fig. 1 on an enlarged scale; Fig. 3 shows an embodiment of an apparatus in accordance with the invention in a representation corresponding to fig. 1; Fig. 4 Shows on an enlarged scale a schematic longitudinal sectional view through a yarn which is strengthened according to fig. 1, and Fig. 5 shows a schematic longitudinal sectional view through a yarn strengthened according to fig. 3.
Description of the Preferred Embodiments
The apparatus according to fig. 1 consists substantially of a stitch base 1 and a needle board 2 which is opposite of stitch base 1 and is inserted in a conventional manner in a needle beam 3. The needle beam 3 is driven reciprocatingly by way of an eccentric drive in the need le-pen etration direction of needles 4. In contrast to conventional stitch bases, the stitch base 1 in accordance with the invention is associated with parallel guide grooves 5 for the yarns 6 to be needled which are held under tensile load between a roller feed 7 and a roller draw-off 8. Additional guide eyes 9 can be provided for the purpose of improved guidance of the yarns 6.
Although the guide grooves 5 are arranged in the form of guide channels in the stitch base 1, this arrangement Is in no way mandatory. The guide grooves 5 could also be formed by guide rules on the stitch base 1, since the lateral guidance of the yarns 6 is concerned in particular. The channels of the guide grooves 5 are rounded off towards the groove base according to fig. 2, which leads to an advantageous lateral guidance for the yarns 6, which are pulled into the guide grooves because the stitch base 1 is provided on the inlet and outlet side with a convex curvature in the direction of passage of yarns 6, so that force components are obtained as a result of the tensile load of yarns 6, which force components press against the stitch base 1. Said force components which occur in the curvature zone are not sufficient, however, in order to allow the omission of a stripper 10 which is disposed between the stitch base 1 and the needle board 2.
The embodiment according to fig. 3 differs from the one according to fig. 1 merely by the arrangement of the stitch base 1 which is continuously curved in a convex manner from the inlet to the outlet side, so that force components which are perpendicular to the stitch base 1 are obtained over the entire guide length of the guide grooves 5, which force components press the yarns 6 against the stitch base 1. A stripper 10 is used nevertheless in order to ensure a calmed yarn guidance which is advantageous for the needling process.
The embodiments according to figs. 1 and 3 differ not only with respect to the forces acting upon the yarns 6, but particularly by the type of needling as is illustrated by the figs. 4 and 5 which each show a yarn 6 with a yarn core 11 and a fiber sheath 12 which can consist of enveloping fibers which are wound about the fiber core 11 - The yarn core 11 and the fiber sheath 12 can also be formed by core and sheath zones of a fiber strand twisted into a yarn. Since according to fig. 1 the needles 4 of the needle board 2 penetrate the yarns 6 perpendicular to the stitch base 1, enveloping fibers are needled substantially perpendicular to the yarn axis through the yarn core 11 according to fig. 4, as is illustrated by the indicated fiber bridges 13. Said fiber bridges 13 connect the fiber sheath 12 with the yarn core 11 and additionally hold the twist of the yarn 6, which causes the desired yarn strengthening.
According to fig. 3, the needles 4 are made to penetrate under different needlepenetration angles the yarns 6 which are guided along the convex stitch base 1, which leads to fiber bridges 13 which are inclined differently with respect to the longitudinal yarn axis, as is schematically indicated in fig. 5 in a purely schematic way. The differently inclined fiber bridges 13 lead to a different interfelting between enveloping fibers and yarn core in comparison with fig. 4, so that an influence on the yarn strengthening can be made through the arrangement of the curvature of the stitch base 1.
Although the needles 4 penetrate the yarns 6 substantially in a common axial plane when the needles 4 are not disposed in a mutually slightly offset way, the fiber bridges 13 are usually not disposed in a common axial plane because a twist of the yarn during the passage through the guide grooves cannot be prevented due to the tensile load on the yarns 6, so that needle penetrations are obtained which are distributed over the circumference of the yarn which is advantageous for an even strengthening of the yarns 6.
Claims (8)
1. A method for strengthening a yarn which is provided with fibers at least in a sheath region enclosing a core zone, with fibers from the sheath zone being needled through the core zone along the yarn.
2. A method according to claim 1, wherein fibers from at least one fiber sheath wound about a yarn core are needled through the yarn core.
3. An apparatus for performing the method according to claim 1 or 2 with at least one needle board which is reciprocatingly drivable in the need le-penetration direction, with the stitch base (1) being provided with at least one guide groove (5) for the yarn (6) extending in the direction of passage and the needles (4) of the needle board (2) penetrating the guide groove (5).
4. An apparatus according to claim 3, wherein the stitch base (1) comprises several parallel guide grooves (5) for one yarn (6) each.
5. An apparatus according to claim 3 or 4, wherein the guide groove (5) or the guide grooves (5) are provided upstream and/or downstream with guide eyes (9) for the yarn (6) or yarns (6).
6. An apparatus according to one of the claims 3 to 5, wherein the stitch base (1) extends at least on the inlet and outlet side in a convexly curved manner in the direction of the guide groove (5) or guide grooves (5).
I I I I 8
7. A method for strengthening yam substantially as hereinbefore described with reference to the accompanying drawings.
8. An apparatus for performing a method according to claim I and substantially as hereinbefore described with reference to and/or as shown in one or more of the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0165100A AT410679B (en) | 2000-09-29 | 2000-09-29 | METHOD AND DEVICE FOR STRENGTHENING A YARN |
Publications (3)
Publication Number | Publication Date |
---|---|
GB0120694D0 GB0120694D0 (en) | 2001-10-17 |
GB2367307A true GB2367307A (en) | 2002-04-03 |
GB2367307B GB2367307B (en) | 2004-03-24 |
Family
ID=3688555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0120694A Expired - Fee Related GB2367307B (en) | 2000-09-29 | 2001-08-24 | A method and an apparatus for strengthening yarns |
Country Status (9)
Country | Link |
---|---|
US (1) | US20020038499A1 (en) |
JP (1) | JP2002146643A (en) |
AT (1) | AT410679B (en) |
CZ (1) | CZ20013474A3 (en) |
DE (1) | DE10138701A1 (en) |
FR (1) | FR2814760B1 (en) |
GB (1) | GB2367307B (en) |
IT (1) | ITGE20010072A1 (en) |
TW (1) | TW546430B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2392926A (en) * | 2002-09-12 | 2004-03-17 | Mag Monika Fehrer | Apparatus for needling at least one yarn |
GB2369375B (en) * | 2000-11-22 | 2004-08-18 | Monika Fehrer | An apparatus for strengthening a textile web with parallel yarns |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6796115B1 (en) * | 2001-12-19 | 2004-09-28 | Gilbert Patrick | Needle punched yarns |
JP2003301364A (en) * | 2002-04-10 | 2003-10-24 | Shikibo Ltd | Unidirectional filament three-dimensional structure by staple fiber interlacing |
CN102181968B (en) * | 2011-04-26 | 2013-01-02 | 东华大学 | Device for improving strength of ring spinning single thread by adopting porcupine roller mode |
CN102181970B (en) * | 2011-04-26 | 2012-11-07 | 东华大学 | Device for improving single thread strength by high-frequency needling method |
CN104088052B (en) * | 2014-07-17 | 2016-08-24 | 苏州华良化纤纺织有限公司 | A kind of elastic filament node generating means |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1111199A (en) * | 1965-08-30 | 1968-04-24 | Singer Co | Methods and apparatus for needling textile fibres |
GB2320508A (en) * | 1996-12-23 | 1998-06-24 | Ernst Fehrer | Method and device for discharging a needled web. |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3208125A (en) * | 1963-07-17 | 1965-09-28 | Bancroft & Sons Co J | Apparatus for making bulked yarn |
US3474611A (en) * | 1966-09-05 | 1969-10-28 | Mitsubishi Heavy Ind Ltd | Method of making fibrous yarns and apparatus therefor |
US3783479A (en) * | 1970-08-27 | 1974-01-08 | Southern Mills Inc | Method of preparing a nonwoven fabric |
US3935046A (en) * | 1972-11-06 | 1976-01-27 | Imperial Chemical Industries Limited | Non-woven fabrics |
US4170868A (en) * | 1976-12-30 | 1979-10-16 | Wwg Industries, Inc. | Yarn forming apparatus with mechanical node locking |
US4350731A (en) * | 1981-06-08 | 1982-09-21 | Albany International Corp. | Novel yarn and fabric formed therefrom |
US4555430A (en) * | 1984-08-16 | 1985-11-26 | Chicopee | Entangled nonwoven fabric made of two fibers having different lengths in which the shorter fiber is a conjugate fiber in which an exposed component thereof has a lower melting temperature than the longer fiber and method of making same |
US4595438A (en) * | 1984-11-05 | 1986-06-17 | Armstrong World Industries, Inc. | Process for making a yarn covered fabric |
US4674271A (en) * | 1986-06-16 | 1987-06-23 | Basf Corporation | Apparatus and process for converting a continuous multifilament yarn to a staple-like yarn |
US5081753A (en) * | 1990-05-31 | 1992-01-21 | Basf Corporation | Apparatus for producing staple-like yarn from continuous filament yarn |
US5248548A (en) * | 1991-11-22 | 1993-09-28 | Memtec America Corporation | Stainless steel yarn and protective garments |
US5454142A (en) * | 1992-12-31 | 1995-10-03 | Hoechst Celanese Corporation | Nonwoven fabric having elastometric and foam-like compressibility and resilience and process therefor |
US6311375B1 (en) * | 2000-07-27 | 2001-11-06 | Gilbert Patrick | Method of needle punching yarns |
-
2000
- 2000-09-29 AT AT0165100A patent/AT410679B/en not_active IP Right Cessation
-
2001
- 2001-08-07 DE DE2001138701 patent/DE10138701A1/en not_active Withdrawn
- 2001-08-10 JP JP2001277242A patent/JP2002146643A/en active Pending
- 2001-08-24 TW TW90120937A patent/TW546430B/en not_active IP Right Cessation
- 2001-08-24 GB GB0120694A patent/GB2367307B/en not_active Expired - Fee Related
- 2001-09-19 IT IT2001GE000072A patent/ITGE20010072A1/en unknown
- 2001-09-26 CZ CZ20013474A patent/CZ20013474A3/en unknown
- 2001-09-27 FR FR0112444A patent/FR2814760B1/en not_active Expired - Fee Related
- 2001-09-27 US US09/965,177 patent/US20020038499A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1111199A (en) * | 1965-08-30 | 1968-04-24 | Singer Co | Methods and apparatus for needling textile fibres |
GB2320508A (en) * | 1996-12-23 | 1998-06-24 | Ernst Fehrer | Method and device for discharging a needled web. |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2369375B (en) * | 2000-11-22 | 2004-08-18 | Monika Fehrer | An apparatus for strengthening a textile web with parallel yarns |
GB2392926A (en) * | 2002-09-12 | 2004-03-17 | Mag Monika Fehrer | Apparatus for needling at least one yarn |
GB2392926B (en) * | 2002-09-12 | 2005-09-21 | Mag Monika Fehrer | An apparatus for needling at least one yarn |
Also Published As
Publication number | Publication date |
---|---|
US20020038499A1 (en) | 2002-04-04 |
ITGE20010072A1 (en) | 2003-03-19 |
FR2814760A1 (en) | 2002-04-05 |
FR2814760B1 (en) | 2004-07-23 |
JP2002146643A (en) | 2002-05-22 |
ITGE20010072A0 (en) | 2001-09-19 |
GB0120694D0 (en) | 2001-10-17 |
TW546430B (en) | 2003-08-11 |
AT410679B (en) | 2003-06-25 |
GB2367307B (en) | 2004-03-24 |
DE10138701A1 (en) | 2002-04-11 |
ATA16512000A (en) | 2002-11-15 |
CZ20013474A3 (en) | 2002-05-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20080824 |