FI92413B - A method of improving the physical surface properties of a spun textile thread - Google Patents

Description

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The present invention relates to a method for modifying the surface properties of spun textile yarns. The present invention relates to a method for modifying the surface properties of spun textile yarns and to a method for improving the physical surface properties of spun textile yarns. In particular, this invention relates to a method for removing hair from such a yarn while removing loose fibers 10 and dirt. According to the invention, the desired surface properties are achieved by using a suitable air spray nozzle. The invention is implemented by means of air spray nozzles.

In the textile industry, the hairiness of yarn and its effect on weaving properties have been considered. As such, the general purpose is to adjust the hairiness of the warp yarns so that the yarns of the fabric stand out clearly and easily. Unfortunately, excessive hairiness and sticking of the warp yarn affect productivity, the quality of the final product and the economy. The main difficulty with the high hairiness of the yarn is that the adhering hair fibers between the ends of the warps tend to prevent the formation of a clear path of the shuttle, i.e. a tune, in the weaving machine.

The slight hairiness of the yarn can be achieved in the spool of the yarn by adjusting the type and weight of the spool, the condition of the tires and the clogging of the sides. In addition to this, it is desirable to obtain uniform hairiness in the various spins as well as to provide good average hairiness, the value of which remains sufficiently limited.

However, the development and commercial acceptance of air-jet weaving in the late 1970s has increased weavers ’concern about hair fibers protruding from the 35 surfaces of short-fiber yarns. Air-jet weaving usually requires higher quality yarns than shuttle weaving to achieve really high productivity. A stuffy tune can interfere with the flight of the weft yarn and lead to the weft yarn stopping.

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It is also known that spooling a ring-spun yarn causes a significant increase in yarn hairiness, sometimes in the order of 100 to 500 percent. In the spooling phase, it has not been possible so far to reduce or adjust the hairiness of 5 spins by preventive measures. To date, there has been no practical method or apparatus for winding ring-spun yarn without causing a significant increase in measurable hairiness.

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Numerous previous attempts have been made to reduce the hairiness of the final finished yarn, but without any noticeable result. For example, attempts to change ring spinning machines have not been successful in producing a yarn with better attachment of outer fibers. Recently, however, it has been found that yarn spun from spaced-apart double-pupin pre-spinning yarns approached the desired surface properties, but such spinning is no longer widely practiced for economic reasons. The experimental companies targeted spooling, including gas burning, mechanical cutting and scraping, but none of these companies produced the desired truly impressive result.

25: It was also known that the tension had an effect on the hairiness of the spun yarn, so that a higher spool tension usually led to a lower hairiness of the spun yarn. This phenomenon is believed to be due to the fact that the longer hair fibers peel off the surface of the yarn as it passes through the heavily loaded tension plates, and thus improve the properties of the entire surface.

Despite such efforts to improve the surface properties of the spun yarn-35 gan, and in particular its hairiness at various stages of the yarn processing process, only limited success has been achieved.

It is therefore a general object of the present invention to control the physical properties of the spun yarn and in particular the hairiness of the spun yarn after spinning and spooling.

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To add background information, the yarn hairiness is determined as the ends of the fibers and the loops of fibers protruding beyond the surface of the yarn, with the fiber loops accounting for about two-thirds of the yarn hairiness and the ends of the fiber inputs accounting for the last third. There are numerous techniques for measuring wire hairiness, although optical and photographic means are now generally preferred. In a typical, widely accepted measurement system, yarn hairiness is determined by counting the number of fibers protruding beyond the surface of the yarn and the result is expressed after a predetermined period of time to obtain an objective result of yarn hairiness per unit length of yarn.

Accordingly, it is a general object of the present invention to improve the surface properties of a spun yarn.

It is a further object of the invention to improve the surface properties of the spun yarn by adjusting the hairiness of the yarn.

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Yet another object of the present invention is to improve the hairiness of yarn in spun yarns by using an air-spray nozzle or a vortex produced by a nozzle.

The object of the invention is to improve the physical properties of the surface of the spun yarn by passing the spun yarn through the air-spray nozzle against the direction of the yarn during spinning.

It is a further object of the invention to improve the physical properties of the surface of the spun yarn by passing the spun yarn through an air jet nozzle and adjusting the angle of the outlet from the nozzle.

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It is a further object of the present invention to remove dust, loose fibers, seedhouse residues and other contaminants from the spun yarns by passing the spun yarn through an air spray nozzle or vortex 5 produced in the nozzle.

Another object of the present invention is to remove impurities from the yarn during winding.

Another object of the present invention is to modify the yarn with a spray nozzle to improve the removal of contaminants during winding.

The objects and objects of the invention are achieved by a method, the main features of which appear from the characterizing part of claim 1.

These and other objects and objects of the invention will become apparent from the following description, in which a preferred embodiment of the invention is shown with reference to the accompanying drawings.

According to the invention, the surface properties of a spun yarn are changed by blowing compressed air perpendicularly against and against the direction of movement of the yarn.

According to the invention, the length of the spun yarn is passed without air. through a spray nozzle, causing the long fibers to wrap around the surface of the yarn. Thanks to the force of the air flow used, surface dirt also peels off.

According to the invention, a conventional, two-zone Mura-ta spray nozzle is used to achieve a new effect, with the first zone producing a counterclockwise air vortex and the second producing a clockwise air vortex, and each air vortex having a speed of the order of 300,000 rpm. By moving the wire axially in a direction opposite to that normally used in the Murata jet spinner, it is obtained exclusively in the N1 zone.

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5 9 2 4 Ί ό at a feed pressure of about 49.6-52.4 kPa significantly low hairiness.

According to another aspect of the invention, the withdrawal angle of the lan-5 gan from the air spray nozzle is adjusted to be about 30 degrees with respect to the axis of the nozzle.

In addition to reducing the hairiness of the yarn, the air flow of the air spray nozzle significantly reduced and peeled the waste of the shell 10 from the surface of the yarn, thus producing a smoother and less hairy yarn.

In the drawings: Figure 1 is a schematic representation of an air-spray system spinning using two air-jet nozzles suitable for use in the present invention and forming the basis for experimental studies of the invention; Fig. 2 is a schematic illustration of a method of the invention using a conventional air jet nozzle; Fig. 3 is a diagram of hair per meter with different spool structures illustrating changes in hairiness in an embodiment of the invention for 35/1 combed cotton; Fig. 4 is a diagram similar to Fig. 3 per hair meter with different winder structures illustrating the changes in hairiness according to the invention in a 35/1 50/50 cotton-polyester blend; Fig. 5 is a diagram of hair per meter as a function of pressure on the wire of Fig. 3; Fig. 6 is a diagram of hair per meter as a function of pressure on the wire of Fig. 4; Fig. 7 is a schematic representation of a modification of the air spray nozzle previously shown in Fig. 1; and Fig. 8 is a schematic diagram illustrating improved impurity removal.

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In the embodiment shown, a conventional air-jet spinner commonly available from Murata Kikai K.K. has been used, more particularly the Murata Model 802 air-jet spinner, a part of which is shown in Fig. 1. In it, the spun yarn is prepared schematically as described from the fluff 22 drawn to the desired thickness by the rear rollers 23, center rollers 24 and front rollers 26, the yarn is fed through a nozzle 26 having a first vortex flow nozzle N1 and a second vortex flow nozzle N2 and converted into spindles 15 which is pulled into the take-up reel device and wound with a spool unit (not shown). The reference letter p describes without an outlet between N1 and N2. For details of such a unit, reference is made to U.S. Pat. no 4 497 167.

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As can be seen in Figure 1, the nozzle 26 has two zones N1, N2. When the yarn is spun with the device as intended, the nozzle N1 causes an air vortex counterclockwise with respect to the direction of travel of the yarn 15, while the nozzle N2 20 causes a clockwise air vortex. This device has an average airspeed speed of 300,000 rpm, as stated by the manufacturer. To prove the properties of the invention, a test spooling device with a constant wire tension of 35 g at a speed of 900 m per minute was used.

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The invention is illustrated in Figure 2 schematically, the spinner is indicated by reference numeral 10. Such a nozzle is generally nukanerotusvyöhyke 12, the housing of the nozzle, a 14, and a compressed air supply 16. The usual air jet 30 nozzles for use in passing the thread through the nozzle designated with a show marked by the arrow. When an air jet nozzle is used, the wire thus passes from the front roll to the conventional inlet 11 of the nozzle 10, through the pile separation zone 12, past the fold-35 point located in the nozzle and from there to the normal outlet 13.

According to the invention, the spun yarn, generally indicated by reference numeral 15, is directed to a nozzle 10, where its hairiness is reduced compared to a conventionally spun yarn. Most preferably, the spun yarn is guided normal to the output 13, which operates as an input of the spun yarn, and the yarn passes through the nozzle 10 in the direction indicated by reference letter c 5 of the arrow against the normal operating mode, and exits the nozzle 10 of a conventional inlet 11. In accordance with the invention provides the spun yarn exit angle of the nozzle 10 to the center line best to about 30 degrees, as indicated by the reference letter b.

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Although the foregoing illustrates a preferred embodiment of the invention, it is not believed necessary to pass the yarn through the air jet nozzles in the reverse direction if the direction of rotation of the spun yarn is opposite to the conventional right-handed direction of rotation.

When using the apparatus of Figure 2, the experimental variables were: (1) the direction of wire movement through the nozzle, either in the normal direction as illustrated in Figure 1 or in the opposite direction as indicated by the arrow in Figure 2; (2) used nozzle blocks, i. either N1 and N2 together, or N1 alone, or N2 alone; and (3) supply air pressure. These parameters are summarized in Table 1 for the diagram shown in Figure 3 and in Table 2 for the diagram shown in Figure 4.

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Table 1. Test data for 35/1 combed cotton (corresponds to Figure 3)

Configuration- Wire Used Pressure1 Hairs on the wire 5 figure direction nozzle (psi) per meter 1 Normal N1N2 1.4 22.63 2 Normal N1N2 2.8 19.05 3 Normal N1N2 4.2 19.95 4 Normal N1 1.4 35 , 82 10 5 Normal N1 2.8 36.8 6 Normal N1 4.2 36.77 7 Normal N2 1.4 21.28 8 Normal N2 2.8 17.1 9 Normal N2 4.2 18.1 15 10 No I did. N1N2 1.4 20.85 11 Conversely. N1N2 2.8 20.85 12 Conversely. N1N2 4.2 24.35 13 Conversely. N1 1.4 29.33 14 Conversely. N1 2.8 20.4 20 15 Conversely. N1 4.2 16.71 16 Conversely. N1 5.5 15.54 17 Conversely. N1 6.9 12.37 18 Conversely. N1 7.2 8.65 19 Conversely. N2 1.4 23.54 25 20 Conversely. N2 2.8 20.2 21 Conversely. N2 4.2 16.72

Multiplying by 6,895 gives the pressure in kPa.

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Table 2. Test data 35/1 50/50 for polyester / cotton (Corresponds to Figure 4)

Configuration- Wire Used Pressure * Hairs on the wire 5 figure direction nozzle (psi) per meter 1 Normal N1N2 1.4 9.47 2 Normal N1N2 2.8 10.91 3 Normal N1N2 4.2 11.85 4 Normal N1 1.4 16.7 10 5 Normal Nl 2.8 17.71 6 Normal Nl 4.2 18.44 7 Normal N2 1.4 8.68 8 Normal N2 2.8 10.78 9 Normal N2 4.2 10.53 15 10 Conversely. N1N2 1.4 11.36 11 Conversely. N1N2 2.8 10.44 12 Conversely. N1N2 4.2 12.81 13 Conversely. Nl 1.4 12.66 14 Conversely. Nl 2.8 10.18 20 15 Conversely. Nl 4.2 9.19 16 Conversely. Nl 5.5 7.25 17 Conversely. Nl 6.9 5.62 18 Conversely. Nl 7.2 5.58 19 Conversely. N2 1.4 10.72 25 20 Conversely. N2 2.8 11.31 21 Conversely. N2 4.2 9.46 * Multiplying by 6.885 gives the pressure in kPa.

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All hairiness tests presented here were performed on a bench model unit of Shirley Developments Ltd, Stockport, England. The test unit was set to detect hair fibers that protruded at least 3 mm to the outside of the wire surface.

The data depicted in Figure 3 relate to 35/1 combed cotton. Of the 21 experiments listed in Table 1, a total of 18 ko- 924 '; Reduced hairiness had been achieved in 3 of 10 yarns compared to normally twisted yarn. Comparing the sides and the quality of the twisted wire, Experiment No. 18 achieved almost the same hairiness per meter at a pressure of 733 kPa and in the reverse direction of the wire through the nozzle N1.

Similarly, the diagram 35/1 shown in Figure 4 relates to a 50/50 polyester / cotton yarn twisted at 900 m per minute at a tension of 35 grams. Note that under normal conditions, the polish hairiness was 4.81 for the 300 m sample, while the hairiness of the spun yarn for the 200 m sample was 14.88. Of these 21 experiments shown in Figure 4, Experiments 4 and 18 showed reduced hairiness in the experiment with twisted yarn compared to the normally twisted yarn. Experiment 18 shows almost the same hairiness in hairs per meter in the reverse direction of the wire at a pressure of 733 kPa through the nozzle N1.

Randomly selected yarns were also twisted using a Murata air jet nozzle with similar dramatic results. In each case, the yarn spun with the Murata spray nozzle showed reduced hairiness under different representative conditions compared to the spun yarn with 35/1 carded cotton; 48.5 / 1 on 65/35 PC; 31/1 25 carded cotton; 35 / l with combed cotton and 15/1 polyester / rayon.

Figures 5 and 6 illustrate the reduction in hairiness as a function of pressure with the inverted yarn of Figures 30 and 4 passing through the nozzle N1. These results tentatively indicate an improved result at higher pressures.

Figure 7 relates to what we have called "reverse N1." The inverse N1 is simply the N1 nozzle portion ir-35 rotated from the N2 nozzle portion.

The inverse N1 was constructed to allow a greater amount of air to contact the wire and thus allow an improved uncertainty of 11 V /> ·. /,

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removal of purities (The volume flow of air through N1 increases when N1 is separated from N2).

In Fig. 7 5 = supply wire 5 6 = compressed air inlet y = wire pull-out direction x = wire pull-out angle with respect to the axis N!

In addition to the reduction in yarn hairiness shown by the experiment described above, it was found that the N1 nozzle peeled off the shell waste from the surface of the yarn. As a result, the spun yarn was significantly cleaner and less hairy and these results were evident regardless of yarn count and blending.

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Reference is made to Figure 8, which shows a diagram of waste removal efficiency using reverse N1 compared to conventional spinning methods or methods using an N1 nozzle with a standard open or closed port 20/1 65/36 PC wire. This removal of impurities achieved by the methods of the present invention demonstrates superior cleaning ability in the practice of the present invention.

The above description of the invention shows that the surface properties of the spun yarn, and in particular the hairiness of the spun yarn, can be significantly reduced compared to a similar spun yarn by passing the yarn through an air spray nozzle. The above also demonstrates a new application to existing equipment for changing the surface properties of a spun yarn using an air spray nozzle. The N1 nozzle, which is specially designed for removing the shells, is roughly twice as large as with conventional rotation or any other nozzle.

Although the use of the Murata air-spray nozzle is described herein by way of example, it does not mean that the other 35 12 - ', Γ · Λ Λ ~ 7 J! Ο The nozzles could produce the same or even better result in the final yarn.

Although the present invention has been described in connection with particular apparatus, it will be apparent that the invention includes many alternatives, variations, and modifications that will be apparent to those skilled in the art.

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Claims (4)

92 * ΐ ό A method for improving the physical surface properties of a spun textile yarn, in particular for reducing hairiness, in which a spun yarn bundle is continuously conveyed along a defined path and through a web vortex on the web, characterized in that the vortex has a forward velocity component parallel to the vortex axis with respect to the direction of movement of the spun yarn-bundle, and a second component of the propagation speed 10 opposite to the helical direction of the yarn-bundle, and that the spun yarn-fiber bundle exits the vortex nozzle at an angle of about 30 ° to the axis of the vortex. 2. A method according to claim 1, which comprises a genome-containing genome and a truncated genome having a non-truncated non-channel, such as a spindle of a transverse splice. 10 A method according to claim 1, characterized in that the medium vortex is provided by passing compressed air through an air jet nozzle with a longitudinal central channel through which the spun yarn bundle passes. 3. A patent according to claim 1 or 2, which comprises a spark plug according to the invention and a contact with the munitions. A method according to claim 1 or 2, characterized in that the spun yarn bundle comes into contact with the edge of the nozzle as it exits the nozzle. Method according to one of the preceding claims, characterized in that the medium vortex is an air vortex and that air is introduced into the air jet nozzle under a pressure of at least about 280 kPa at the inlet stage. 30 1. For the purpose of determining the physical nature of the fineness of the textile fabric, the fineness of the fineness of the fleece, the color of the fleece of the fineness of the fineness of the animal and the genome of the medium, en hastighetskom-35 Ponent i fortplantningsriktningen som är parallell med vir-velns rotationsaxel and normalt miktatt riktad i förhallande account rörelseriktningen hos trädsträngsknippet, och en andra hastighetskomponent i fortplantningsriktningen som sa- twisting, with the aid of a three-stroke knife with a twisted axle of 30 °. 5 4. For the purposes of the present invention, a patent is provided for the use of airfoils and airfoils and airfoils for airbags which do not exceed about 280 kPa in inert air pressure. tl.