GB2098245A

GB2098245A - Apparatus for the manufacture of textured yarns

Info

Publication number: GB2098245A
Application number: GB8207736A
Authority: GB
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 1981-03-23
Filing date: 1982-03-17
Publication date: 1982-11-17
Also published as: JPS57154778U; IT8248044A0; IT1148528B; FR2502194B1; DE3210665A1; FR2502194A1; GB2098245B; DE3210665C2

Abstract

An apparatus for manufacturing textured yarns from spun filaments includes means (13) by which water is applied to the filamentary bundle (Y1) before the filament bundle is introduced into a bulking nozzle (14). The wetting device (13) has an opening (22) arranged along the yarn path from the feed roller (11) to the fluid jet nozzle (14) and the filament bundle is passed through water which flows continuously out from the opening (22) of the pipe (20). <IMAGE>

Description

SPECIFICATION Apparatus for the manufacture of textured yarns The present invention relates to apparatus for manufacturing textured yarns and, more specifically, relates to an apparatus provided with means by which water is applied to the filamentary bundle before the filament is introduced into a fluid bulking nozzle.

Spun filamentary yarns are ordinarily smooth and unattractive in terms of touch and feel. For example, since spun nylon filaments have a circular cross-section and are very siippery, they cannot be put into practicel use without using a finishing process, except for special uses.

Accordingly, various methods have been adopted in which permanent loops, swirls or entanglements are given to filamentary yarns to impart flexibility or bulkiness not possessed by asspun filamentary yarns.

For example, irregular entanglements or loops are given to filaments by utilising the turbulent effect of an air jet to render them bulky.

More specifically, a filament bundle is exposed to the turbulent flow of an air jet stream to separate monofilaments from one another and move them violently in a zone of disturbance, the filaments are taken out from the zone in such a manner that no tension is imposed on the filaments, and at the moment when the filaments are taken out from the zone loops, swirls, coils or entanglements are irregularly given to the filaments as a result of a slackening of the filaments, whereby a bulky textured yarn is produced.

In this method, using an air jet, a large quantity of air has to be used, and the method is economically disadvantageous, especially when fine-denier yarns are processed.

In the above-mentioned apparatus, water is applied to the filament bundle before the filament bundle is introduced into the bulking nozzle. For example, as shown in Fig. 8, water 2 is stored in a water tank 1, and a filament bundle 4 is passed through the water tank 1 before the filament bundle 4 is introduced into a nozzle 3, whereby water is applied to the filament bundle 4.

According to this method however, since the filament bundle is passed through the water tank, guides 5 and 6 are inevitably provided, and, since one guide is secured at a position where the guide 6 is immersed in water, the filament bundle 4 is inevitably bent at two points. Accordingly, a frictional resistance is imposed on the running filament bundle at the positions of the guides 5 and 6, and uniform processing cannot therefore be performed. The state of the contact between the surface of the guide 6 immersed in water and the yarn is always changing under overfeed of the filament bundle. Accordingly, the running speed of the filament bundle becomes irregular and, hence, the guiding of the filament bundle to the bulking nozzle becomes irregular, whereby the manufacture of the textured yarns is disturbed.

Since an oil ordinarily adheres to as-spun filaments, this oil becomes incorporated into the water tank 1 and contaminates the water. As the filament bundle passes through the contaminated water, this results in a degradation of the commercial value of the textured yarn which is produced.

It is an object of the present invention to eliminate the foregoing disadvantages. According to the present invention, the filament bundle is passed through continuously flowing water and the filament bundle travels through the water without any bending of the bundle.

In accordance with the present invention there is provided apparatus for the manufacture of textured yarns, which comprises feed rollers, a yarn-texturing fluid jet nozzle, and a wetting device positioned on the yarn path between the feed rollers and the nozzle, wherein water is arranged to flow out from an opening in the wetting device and is arranged to flow over a filament bundle travelling on a line from the feed rollers to the nozzle.

By dint of this structural feature the running direction of the filament bundle need not be changed and no guide for bending the filament bundle need be provided. Accordingly, the resistance of the guide is eliminated and the filament bundle supplied to the fluid nozzle is uniform. Therefore, the texturing process can be performed very uniformly.

Moreover, the operation of suspending the filament bundle in the wetting device can easily be accomplished when the operation of the apparatus for the manufacture of textured yarns is started, and, since clear water perpetually flowing out from the water supply pipe is applied to the filament bundle, contamination of the filament bundle is prevented.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which: Fig. 1 is a schematic diagram illustrating the structure of an embodiment of apparatus for the manufacture of textured yarns; Fig. 2 is a partially sectional side view showing a first embodiment of wetting device in accordance with the invention; Fig. 3 is a front view of the wetting device shown in Fig. 2; Fig. 4 is a sectional view of the guide groove of the wetting device; Fig. 5 is a sectional side view showing a second embodiment of wetting device in accordance with the invention; Fig. 6 is a sectional view showing still another embodiment of wetting device in accordance with the invention; Fig. 7 is a sectional view showing one embodiment of the fluid jet bulking nozzle; and, Fig. 8 is a schematic diagram illustrating the conventional wetting device.

Referring first to Fig. 1, this shows an embodiment of apparatus for the manufacture of textured yarns in which a filament bundle 9 drawn from a yarn supply source 8 supported on a creel stand 7 is positively advanced by feed rollers 10 and 11 and fed to a nozzle box 12. In the nozzle box 1 2 there is a wetting device 1 3 to be described hereinafter and also a fluid jet bulking nozzle 14. The wetted filament bundle is introduced into the fluid nozzle 14 and irregular loops and entanglements are formed in the filament bundle by the above-mentioned swirling action. The bulked textured yarn Y is transferred to a setting heater 16 by a feed roller 15, guided to a winding device by a feed roller 1 7 and wound on a package 18.

One embodiment of wetting device is illustrated in Figs. 2 to 4. The end portion of a water supply pipe 19 is bent to form a vertical portion 21 to follow an inclined portion 20, and the top end portion is bent in the direction away from the yarn path Y1 The vertical portion 21 of the pipe is cut in the vertical plane to form a guide groove 22 having a semicircular cross-section as shown in Fig. 4. The shape of the groove 22 is not limited to the semicircular shape shown in the drawing, but could have a U-shape, a V-shape or the like.The guide groove 22 is parallel to a substantially vertical line Y1 connecting a yarn separating point 11 a of the upper feed roller to a yarn inlet 23 of the fluid nozzle 1 4. A predetermined distance I is left between a bottom wall 21 of the groove 22 and the vertical line Y1 so that the filament bundle is not brought into contact with the bottom wall or the side wall of the guide groove 22, and the position of the guide groove 22 is determined. Accordingly, the filament bundle is passed through water without coming into contact with the guide groove 22, as shown in Fig. 4.

Fig. 5 illustrates another embodiment of wetting device. In this embodiment, an opening in the upper part of a water supply pipe 24 is bent in a smooth curve and a guide groove 25 is arranged to extend in the vertical direction. The lower end 25a of the guide groove 25 is aligned with the yarn path.

Fig. 6 illustrates another embodiment of wetting device. An opening 27 at the end of a water supply pipe 26 is cut in the vertical plane, and the yarn path Y1 is substantially linear and parallel to the end face 27 of the opening of the water supply pipe 26. The filament bundle is here passed through water flowing down out of the end of the water supply pipe 26.

Fig. 7 shows embodiment of fluid nozzle 14 arranged to follow the wetting device 13. The nozzle 14 comprises a nozzle body 28 and a needle 29 inserted into and secured in the nozzle body 28. The needle body 28 has a generally cylindrical recess for insertion of the needle and, forwardly of the recess, a frusto-conical portion 30 and a yarn passing hole 31. The yarn passing hole 31 comprises a cylindrical portion 32 and an outwardly tapering portion 33. A pressurised fluid supply tube 34 is connected to the nozzle body.

The needle 29 has an axial yarn passing hole 35 piercing the needle 29 through the centre. A tapered face 36 is formed at the periphery of the forward end of the needle and an annular passage S is formed between the tapered face 36 and the conical face 30 of the nozzle body 28. A zone of disturbance Z is formed between the forward end of the needle 29 and the yarn passing hole 31 in the nozzle body. Furthermore, chambers 37 and 38 are formed between the needle 29 and the nozzle body 28, and at least one fluid transfer hole 39 is formed between the chambers 37 and 38.

The pressurised fluid supplied from the fluid supply tube 34 is jetted into the chamber 38 from the chamber 37 through the hole 39, swirled around the needle 29 or directed linearly past the needle 29 and jetted through the passage S into the zone Z. In the zone Z the filament bundle, in a relaxed state due to overfeeding, is subjected to disturbing, separating and swirling actions and is discharged into the open air from the nozzle 14 so that no tension is imposed on the filament bundle.

An O-ring 40 of an elastic material such as a nitrile rubber is arranged in the portion of the needle 29 where it fits into the nozzle body 28 to prevent the pressurised fluid supplied to the nozzle from ieaking back to the yarn introduction side of the nozzle.

The filament bundle 9 withdrawn from the yarn supply source 8 shown in Fig. 1 is supplied to the wetting device 13 in an overfed state by the feed rollers 10 and 11, and, as shown in Figs. 2 and 4, the filament bundle is passed through clean water W flowing in the vertical guide groove 22 of the water supply tube 19 without coming into contact with the bottom wall or side walls of the guide groove 22 and without being bent by guide rollers or the like.

Claims

1. Apparatus for the manufacture of textured yarns, which comprises feed rollers, a yarntexturing fluid jet nozzle, and a wetting device positioned on the yarn path between the feed rollers and the nozzle wherein water is arranged to flow out from an opening in the wetting device and is arranged to flow over a filament bundle travelling on a line from the feed rollers to the nozzle.

2. Apparatus as claimed in claim 1 , wherein said wetting device comprises a water supply pipe having an inclined portion, a vertical portion in which an opening is formed by cutting the wall of the pipe in the vertical plane to form a guide groove, and a top end portion extending in a direction away from the yarn path, said guide groove being arranged parallel to a substantially vertical line connecting the point where the yarn separates from the preceding feed roller to a yarn inlet of the nozzle, and a predetermined distance being provided between a bottom wall of the groove and the vertical yarn path so that the filament bundle is passed through water without coming into contact with the guide groove.

3. Apparatus as claimed in claim 2, wherein said guide groove has a semi-circular cross section.

4. Apparatus as claimed in claim 1, wherein said wetting device comprises a water supply pipe having an opening in the upper portion thereof extending in a smooth curve and having a guide groove extending in the vertical direction, the lower end of said guide groove being located on the yarn path.

5. Apparatus as claimed in claim 1, wherein said wetting device comprises a water supply pipe the end of which is cut in the vertical plane and the end opening of which is parallel to the yarn path so that the filament bundle is passed through water flowing out and down from the end opening of the water supply pipe.

6. Apparatus as claimed in any preceding claim, wherein said nozzle comprises a nozzle body having a generally cylindrical recess for the insertion of a needle and, forward of the recess, a frusto-conical chamber and a yarn passing hole, and a needle slidably and sealingly inserted into said recess, said needle having a yarn passing hole extending axially centrally therethrough and a tapered face formed at the periphery of the forward end of the needle so that a zone of disturbance is formed between the innerface of the frusto-conical chamber in the needle body and the tapered face of the needle.

7. Apparatus for the manufacture of textured yarns as claimed in claim 1 substantially as hereinbefore described with reference to Figs. 2 to 4, Fig. 5, or Fig. 6 of the accompanying drawings.