WO2004046438A1 - Method for elevating the thread end of a weft thread before the introduction thereof into a shed and jet loom for carrying out the method - Google Patents
Method for elevating the thread end of a weft thread before the introduction thereof into a shed and jet loom for carrying out the method Download PDFInfo
- Publication number
- WO2004046438A1 WO2004046438A1 PCT/DE2003/003509 DE0303509W WO2004046438A1 WO 2004046438 A1 WO2004046438 A1 WO 2004046438A1 DE 0303509 W DE0303509 W DE 0303509W WO 2004046438 A1 WO2004046438 A1 WO 2004046438A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- weft thread
- weft
- thread
- modified
- section
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
Definitions
- the invention relates to a method for increasing the thread closure of a weft before its entry into a shed and a jet weaving machine, by means of which the thread closure is not adversely affected, in particular in multifilament games by means of a fluid flow as a holding means before the weft is inserted into the shed.
- the weft thread entered into the shed is fed from a thread store, which is also referred to as a pre-winder or pre-winder, to a generally pneumatic acting main nozzle of a certain length representing a weft insertion means.
- the main nozzle has an injector and a mixing tube, which picks up a weft thread and holds it there until the weft thread is inserted into the shed by the action of the usually pneumatically acting weft thread insertion means until the weft thread is inserted into the shed.
- the remaining part of the weft thread is located between the main nozzle and the thread store / pre-winder as well as on the thread store / pre-winder itself and is held there until the weft thread is inserted.
- the weft thread can be introduced by means of air or by means of water.
- air jet weaving machines the weft thread located in the mixing tube of the main nozzle is kept stretched before it is introduced with the aid of an air stream, the air stream acting essentially in the direction of the longitudinal center axis of the mixing tube.
- holding air is blown into the mixing tube in the specified manner during the entire time that the weft thread is held before it is entered into the shed.
- the actual weft insertion is very short and takes place depending on the yarn quality at a pressure of between 1.0 and 6.0 bar, the pressure of the holding air in usually between 0.1 and 1.5 bar.
- the time during which the weft thread is held in the mixing tube of the main nozzle by means of holding air therefore increases depending on the repeat or pattern, in comparison to the very short weft insertion time, by a multiple. This further increases the possibility of undesired thread modification.
- the pressure of the holding air in the main nozzle must be increased further compared to normal yarns, on the one hand to prevent the weft threads from springing back out of the main nozzle and on the other hand to achieve a thread tension that is as constant as possible.
- a higher pressure in the main nozzle or the injector of the main nozzle increases the possibility that the threads are modified at least in the area of the main nozzle.
- Permanent use of holding air over a more or less large area of the weft thread at a pressure increased for the thread tension can, in addition to the loss of fibers, also result in the loss of a thread section or a loosening of the sheathing in so-called core yarns.
- a thread monitor for example, does not detect that the covering of core yarns is broken as an error, but it later appears as a fabric error.
- WO 00/52242 describes a device for inserting weft threads for a weaving machine with at least one nozzle, which has an inflow opening for a pressure medium and which is designed such that the pressure medium undergoes a rotation about the longitudinal axis of the nozzle.
- a weft or an additional rotation is given to a weft thread located in the device.
- the pressure medium which therefore has a twist, holds the weft thread between the individual wefts for a longer time, in which case excessive rotation should be avoided, since otherwise a fabric of reduced quality would result.
- JP 02234961 A describes a device of a weaving machine which, inter alia, has an intermittently working means for twisting arranged between a first and a second weft thread holding means and means for heat-fixing the twists in the weft thread before it is temporarily stored on a pre-winder.
- the means used to increase the closing of a weft thread are expensive in their entirety. Furthermore, these means essentially do not allow a selective thread closure, but this is important with regard to a low weft thread drop.
- the object of the invention is to provide a method for increasing the thread closure of a weft thread before its entry into a shed by means of a fluid stream, and a jet weaving machine, by means of which the thread closure of filament yarns in particular can be increased at least temporarily and in some areas or to such a way
- the way can be increased or can be maintained in such a way that the filaments do not detach from the yarn composite and thus the quality of the fabric is increased and / or the yarn waste is reduced.
- the weft thread is at least temporarily stored before it is inserted into the shed and at least a portion of the weft thread is modified during the intermediate storage in such a way that when the weft thread is held in the main nozzle filaments of the weft thread cannot be detached from the yarn composite by means of a fluid flow / air flow.
- Modifying is understood to mean increasing the thread closure or securing the thread closure in such a way that even longer exposure of the fluid flow to the weft thread for the purpose of holding it in the main nozzle before the weft thread is introduced into the shed does not at least prevent the thread closure
- the modification is preferably also carried out in such a way that the thread closure is preferably maintained even when the weft thread is inserted into the shed, by increasing the thread closure or securing the itself Existing thread closure prevents the filaments of the weft thread from coming off the yarn composite as a result of the action of the fluid flow for holding the weft thread in the main nozzle.
- the modified section of the weft extends essentially to the area of the weft in which the tip of the weft is located after it has been cut off.
- the weft thread is therefore preferably modified only in the area in which the weft thread is actually exposed to the holding air even while it is in a waiting position, that is to say in a position in which the thread has a defined thread tension in the main nozzle in preparation for insertion the weft is held in the shed.
- a major advantage of the method according to the invention is that the thread closure of the weft thread is increased so that, despite the holding air acting in particular in the main nozzle, even with prolonged exposure to this holding air the thread quality of the weft thread is not adversely affected and is maintained as it is in the main nozzle is fed.
- the fluid flow / air flow acting on the weft thread for the purpose of holding it does not exert such an influence that filaments of the weft thread are detached from its yarn composite, and consequently the quality of the weft thread does not deteriorate due to the action of the fluid flow / air flow.
- the method for increasing the thread closure can be modified so that after its modification the increased thread closure allows the filaments to remain in the yarn.
- the weft thread it is also possible for the weft thread to be modified in such a way that the modification only occurs intermittently, where “intermittent” means that, for example, the modification is essentially only continued until the thread is inserted.
- the thread modification therefore does not have to be permanent, but can be reversibly completely canceled out, so that it is also prevented that a modification has no adverse effect on the quality of the tissue produced.
- the section of the weft thread held in the main nozzle is preferably thermally modified, ie thermal treatment is carried out in such a way that the thread is modified.
- This modification can consist in that, for example, the filaments lying on the outside of a thread are preferably easily brought into a state by thermal treatment, in which they acquire greater adhesiveness compared to filaments lying adjacent to them. This is particularly easy for synthetic yarns, for which by thermal treatment a sticking together of neighboring filaments can be achieved when a temperature is reached at least in the vicinity of the melting point of the fibers.
- the section of the weft thread is modified by welding the filaments together.
- a welding of the filaments is achieved, for example, when the temperature of the individual filaments at least in sections reaches such a height that the filaments are welded / fused together.
- Such welding means a permanent increase in the thread closure.
- the energy input when welding the filaments is preferably selected so that the external appearance of the thread is not significantly influenced.
- the modification of the weft thread is preferably not only in an area which is preferably part of the later weft thread waste after the weft thread has been inserted, i. H. limited to the area of the tip of the weft.
- the tip of the weft thread arises when the weft thread is inserted and cut off after its entry, so that the tip of the section of the weft thread located in the main nozzle, as seen in the entry direction of the weft thread, represents the tip of the weft thread to be subsequently inserted.
- the modification can be achieved directly in the cutting area by thermally modifying the cutting area of the weft thread in such a way that the filament end areas melt together. As a result, a loosening of the thread closure, starting from the tip of the weft thread, can no longer readily propagate into the area of the main nozzle after it has been separated.
- lasers also represent a special form of welding the filaments, with lasers being able to dose energy into the yarn or into the filaments of the weft thread in a targeted manner at a specific time and place, and it can therefore be introduced in an effect-oriented manner.
- the weft is modified by chemical treatment.
- the weft thread or the section of the weft thread is preferably modified by means of a chemical substance such that the individual filaments are converted into a state of improved or increased adhesion with neighboring filaments by means of a chemical reaction, so that the thread closure of the yarn composite of the weft thread is increased.
- the respective chemical substances which bring about a chemical modification of the filaments or the yarn of the weft thread depend on the material from which the weft yarns are made. Your choice is at the discretion of the average professional.
- a modification of at least one section of a weft thread that can be converted completely without resistance and thus reversibly into an unmodified state consists in that this section is temporarily iced over.
- the icing has the advantage that an action of holding air on the thread does not result in any reduction in the thread closure. Rather, even with prolonged exposure to the holding air on the icy weft thread section, provided that the icing temperature is only low enough to withstand a prolonged exposure to the holding air, the thread closure achieved by icing remains intact. After the weft thread has been introduced into the fabric and the icing has been reversed, there is essentially a completely unmodified weft thread in the fabric. This enables a particularly high quality of the fabric to be achieved.
- a jet weaving machine in particular an air jet weaving machine, has at least one pre-winder as a buffer for at least temporarily storing a weft thread, at least one main nozzle having a mixing tube, by means of which the weft thread, which preferably consists of multifilament yarn, can be inserted into a shed and an entry side filling scissors.
- the air jet weaving machine has a modification device, by means of which a weft thread can be modified at least over a section of its temporarily stored length before it is inserted into the shed, so that the thread closure in this section of the weft thread is increased to such an extent that filaments of the yarn during holding in the Mixing tube by means of a fluid, in particular compressed air, and / or during the entry into the shed essentially cannot be detached from the yarn composite.
- the main advantage of the jet loom according to the invention is that such a thread closure of the weft thread can be achieved by means of the modification device that Even in the event of prolonged exposure to a fluid for the purpose of holding the weft thread / weft thread section in the mixing tube, the structure of the thread is not changed, ie individual filaments or even several filaments are not detached from the yarn composite.
- the weft thread is fed from the pre-winder to the main nozzle in a known manner.
- the modification device is attached in such a way that the section of the respective weft thread on the pre-winder can be modified.
- the modification device is arranged in the area of the pre-winder.
- the modification device is preferably arranged on the pre-winder or at such a location in the region of the pre-winder that the section of the respective weft thread can be modified.
- the section of the weft thread modified in the area of the pre-winder is later held there by means of the holding fluid after it has been introduced into the main nozzle, so that the action of the holding fluid, in particular holding air, does not result in a change in the yarn composite. H. no filaments are detached from the yarn composite by the action of the holding fluid.
- the arrangement of the modification device in the area of the pre-winder in which there is a resting phase of the weft thread is particularly simple for the modification process in or with the modification device.
- the modification device is preferably provided with a thermal cutting device, in which the tip of the weft thread can be thermally modified during cutting.
- the individual cutting elements are raised to such a temperature that the tips of the filaments are fused or welded to one another at the interface, so that if the holding fluid in the area of the main nozzle is left to act for a prolonged period of time, the dissolving of the thread closure, otherwise present, begins, starting from that Tip of the weft, is prevented.
- the thermal modification of the filaments can also be realized in that the modification device is designed as a heating device, preferably also as a welding device. It is also possible that the modification device is a laser. In any case, the heating device, the welding device or the laser introduce energy into the yarn composite of the weft thread, by means of which the thread closure by fusing, increasing the adhesive force of the filaments with one another or, for example, point-by-point connection of the individual filaments by means of the laser is possible.
- the advantage of using a laser as a modification device also consists in the fact that the weft thread is modified very precisely at certain points or in very narrow defined areas, so that although the thread closure is increased, the normal quality of the weft thread is visibly influenced only insignificantly.
- the modification device of the jet weaving machine is designed as a chemical device which realizes the use of chemical means by means of which the individual filaments increase their adhesive force by chemical reaction with one another or chemically fuse with one another.
- This modification device in the form of the chemical device is preferably also arranged in the region of the pre-winder, so that the weft thread can be modified on the pre-winder.
- the modification device is designed as an icing device.
- the icing device offers the possibility of temporarily modifying the weft thread, so that interference by a holding fluid can be ruled out during the time during which the weft thread is in the main nozzle.
- the icing can easily be reversibly removed, so that the icing is removed without residue and the original quality of the weft is retained.
- FIG. 1 shows a side view of a pre-winder with integrated modification device and FIG. 2 shows a view of the pre-winder in accordance with direction arrow A according to FIG. 1.
- FIG. 1 is a basic illustration of a side view of a pre-winder 1 with an integrated modification device 2.
- a weft thread 4 is fed to the pre-winder 1 from a bobbin (not shown).
- the pre-winder 1 has a winding body 3 on which a defined length of the weft thread 4 is held.
- the weft thread is unwound from the winding body 3 and fed to a main nozzle (not shown) with a mixing tube.
- the weft thread 4 is cut off in the region between the outlet from the mixing tube and the fabric edge by means of a cutting device (not shown). I.e.
- a length of weft thread is stored on the winding body 3 such that the weft thread can be completely inserted into the shed up to the catch side and then cut to length.
- Weft material is therefore kept on the winding body 3. Due to the arrangement of the weft thread on the winding body 3, this is during a time in which the weft thread is not being shot, i. H. is in a waiting position, in a rest position.
- a modification device 2 is arranged on the outer circumference of the winding body 3, which, while the winding body 3 of the pre-spooler 1 is in the rest position, carries out the modification of the weft thread 4 in a region which later essentially corresponds to the section of the weft thread which, after the inserted weft thread has been cut to length in the main nozzle or in the mixing tube of the main nozzle.
- the entire weft thread can be modified over its entire length, for example with a reversible modification of the weft thread.
- Fig. 2 is a view of the pre-winding device according.
- the weft thread 4 is wound in several turns on the winding body 3.
- the modification device 2 sits on the circumferential area of the winding body 3 and is attached in such a way that the area of the weft thread is modified, which is located in the area of the main nozzle or the mixing tube after the entry of the previous weft thread and can therefore be held by means of holding air without being Detach filaments from the weft thread.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03776811A EP1560964A1 (en) | 2002-11-15 | 2003-10-22 | Method for elevating the thread end of a weft thread before the introduction thereof into a shed and jet loom for carrying out the method |
DE10394063T DE10394063D2 (en) | 2002-11-15 | 2003-10-22 | Method for increasing the thread closing of a weft before it enters a shed and jet loom for performing the method |
AU2003286104A AU2003286104A1 (en) | 2002-11-15 | 2003-10-22 | Method for elevating the thread end of a weft thread before the introduction thereof into a shed and jet loom for carrying out the method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002153238 DE10253238A1 (en) | 2002-11-15 | 2002-11-15 | Process for increasing the thread closure of a weft before its entry into a shed and jet loom for carrying out the process |
DE10253238.9 | 2002-11-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004046438A1 true WO2004046438A1 (en) | 2004-06-03 |
Family
ID=32308553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2003/003509 WO2004046438A1 (en) | 2002-11-15 | 2003-10-22 | Method for elevating the thread end of a weft thread before the introduction thereof into a shed and jet loom for carrying out the method |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1560964A1 (en) |
CN (1) | CN1711381A (en) |
AU (1) | AU2003286104A1 (en) |
DE (2) | DE10253238A1 (en) |
WO (1) | WO2004046438A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007303004A (en) * | 2006-05-09 | 2007-11-22 | Tsudakoma Corp | Air jet loom |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1499744A (en) * | 1965-11-15 | 1967-10-27 | Plutte | Process and equipment for the continuous treatment of textile threads or twists |
US4726098A (en) * | 1986-10-24 | 1988-02-23 | Burlington Industries, Inc. | Combination vortex action processing and melt sizing of spun yarn |
US4756341A (en) * | 1985-09-04 | 1988-07-12 | Tsudakoma Corp. | Method of and apparatus for automatically resetting weft storage device |
US5343899A (en) * | 1990-03-12 | 1994-09-06 | Iro Ab | Output yarn brake |
US5937915A (en) * | 1996-12-19 | 1999-08-17 | Lindauer Dornier Gesellschaft Mbh | On loom weft texturizing |
DE19941784A1 (en) * | 1999-09-02 | 2001-03-08 | Picanol Nv | Weaving machine with a device for severing a weft thread |
US6470918B1 (en) * | 1998-09-11 | 2002-10-29 | Iro Patent Ag | Yarn processing system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02234961A (en) * | 1989-03-08 | 1990-09-18 | Teijin Ltd | Fragment loom |
JPH03161557A (en) * | 1989-11-15 | 1991-07-11 | Murata Mach Ltd | Loom |
DE4131000A1 (en) * | 1991-09-18 | 1993-03-25 | Dornier Gmbh Lindauer | Jet loom weft cutter - has a hot wire between jet and insertion channel outside jet flow field with facing yarn push unit |
BE1012494A3 (en) * | 1999-03-02 | 2000-11-07 | Picanol Nv | Device for the insertion of a weft thread. |
-
2002
- 2002-11-15 DE DE2002153238 patent/DE10253238A1/en not_active Withdrawn
-
2003
- 2003-10-22 AU AU2003286104A patent/AU2003286104A1/en not_active Abandoned
- 2003-10-22 WO PCT/DE2003/003509 patent/WO2004046438A1/en not_active Application Discontinuation
- 2003-10-22 CN CN 200380103172 patent/CN1711381A/en active Pending
- 2003-10-22 EP EP03776811A patent/EP1560964A1/en not_active Withdrawn
- 2003-10-22 DE DE10394063T patent/DE10394063D2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1499744A (en) * | 1965-11-15 | 1967-10-27 | Plutte | Process and equipment for the continuous treatment of textile threads or twists |
US4756341A (en) * | 1985-09-04 | 1988-07-12 | Tsudakoma Corp. | Method of and apparatus for automatically resetting weft storage device |
US4726098A (en) * | 1986-10-24 | 1988-02-23 | Burlington Industries, Inc. | Combination vortex action processing and melt sizing of spun yarn |
US5343899A (en) * | 1990-03-12 | 1994-09-06 | Iro Ab | Output yarn brake |
US5937915A (en) * | 1996-12-19 | 1999-08-17 | Lindauer Dornier Gesellschaft Mbh | On loom weft texturizing |
US6470918B1 (en) * | 1998-09-11 | 2002-10-29 | Iro Patent Ag | Yarn processing system |
DE19941784A1 (en) * | 1999-09-02 | 2001-03-08 | Picanol Nv | Weaving machine with a device for severing a weft thread |
Also Published As
Publication number | Publication date |
---|---|
DE10253238A1 (en) | 2004-06-09 |
CN1711381A (en) | 2005-12-21 |
DE10394063D2 (en) | 2005-10-06 |
EP1560964A1 (en) | 2005-08-10 |
AU2003286104A1 (en) | 2004-06-15 |
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