FI92413C - 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 a spun textile yarn by a method for improving the physical surface properties of a spun textile yarn. A method for improving the physical surface properties of a spun textile yarn is a method for improving the physical surface properties of a spun textile yarn. In particular, the present invention is directed to a method of 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 control the hairiness of the warp yarns so that the yarns of the fabric stand out clearly and easily. Excessively, the excessive hairiness and sticking of the warp yarn affects 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 shuttle path, i.e. a tune, in the weaving machine.

25 The slight hairiness of the yarn can be achieved in the spool of the yarn by adjusting the type and weight of the knife, the condition of the tires and the clogging of the sides. In addition, it is desirable to achieve uniform hairiness in the various spins and 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 for 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 the spooling of ring-spun yarn causes a significant increase in yarn hairiness, sometimes in the order of 100 to 500 percent. To date, it has not been possible to reduce or control the hairiness of 5 spins by preventive measures. To date, there has been no practical method or device 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 finished yarn, but without any significant results. For example, attempts to modify ring spinning machines have not been successful in producing yarn with better attachment of outer fibers. Recently, however, it has been found that a yarn spun from spaced-apart double-pupin pre-spinning yarns approached the desired surface properties, but such spinning is no longer practiced more widely for economic reasons. The experimental attempts focused on spooling, including gas burning, mechanical cutting and scraping, but none of these attempts 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 spool yarn. This 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, thus improving the properties of the entire surface.

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

li> Z 4 i V- '3 Therefore, it is 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 hairiness of the yarn is defined as the number of fibers and loops of fibers protruding beyond the surface of the yarn, with the fiber loops still accounting for about two-thirds of the yarn's hairiness and the fiber ends accounting for the last third. There are numerous techniques for measuring wire hairiness, although optical and light-imaging means are now generally preferred. In a typical, widely accepted measurement system, yarn hairiness is determined by counting the number of fibers that protrude beyond the surface of the yarn and the result is expressed after a predetermined period of time to obtain an objective result per yarn length.

Thus, 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 a 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 nozzle 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 exit from the nozzle.

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

Yet 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 impurities 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 the spun yarn are changed by blowing compressed air perpendicularly against the direction of movement of the yarn and against its direction of movement.

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, the first zone producing a counterclockwise air vortex and the second producing a daytime air vortex, and the speed of each air hydride is of the order of 300,000 rpm. By moving the wire axially in a direction opposite to that normally used in a Murata jet spinner, it is obtained exclusively in the N1 zone.

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5 9 2 4 'i ό with 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 ga 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 debris 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 a spinneret of an air-spray system according to the known manner, using two air-spray nozzles suitable for use in the present invention and which formed 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 puff-wide structures illustrating changes in hairiness in an application of the invention for 35/1 combed wood wool; Fig. 4 is a diagram similar to Fig. 3 per hair meter with different spooler 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 with 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 generally available from Murata Kikai K.K., in particular the Murata Model 802 air-jet spinner, of which part is shown in Fig. 1, has been used. In it, the spun yarn is prepared schematically as described to the desired thickness from the drawn roll 22 drawn on the rear rollers 23, center rollers 24 and front rollers 26, the yarn is fed through a nozzle 26 with a first rotary flow nozzle NI and a second rotary flow n1. into a spun yarn 15 which is drawn into a take-up reel device 10 and wound on 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 Fig. 1, the nozzle 26 has two zones NI, N2. When the yarn is spun with the device as intended, the nozzle N1 produces a counterclockwise air vortex with respect to the direction of travel of the yarn 15, while the nozzle N2 20 causes a myot day rotation. This device has an air vortex speed of 300,000 rpm on average, according to the manufacturer. To prove the properties of the invention, a test spooling device was used with a constant wire tension of 35 g at a speed of 900 m per minute.

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That invention is illustrated in Figure 2 schematically, the spinner is indicated by reference numeral 10. Tållaisessa nozzle is usually nukanerotusvyohyke 12, the nozzle sisåltåvå housing 14, and the compressed air sy5tt6 16 in the ordinary air-jet 30 nozzles kåyttoå closets passes through the wire nozzle låpi reference letter A show marked by the arrow. When the 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 separator 12, past the fold 35 placed 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 kehråtty wire is guided tavanomai-tion to the output 13, which is kehråtyn wire sisååntulo-Na, and the yarn passes through the nozzle 10 låpi reference letter c 5 indicated arrow direction against the usual kåyttotapaa, and exits the nozzle 10 of a conventional sisååntulosta 11 Kek-sinndn såådetåån kehråtyn in accordance with the wire the exit angle relative to the center line of the nozzle 10 is preferably 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 wire through the air jet nozzles in the opposite direction if the direction of rotation of the spun yarn is opposite to the conventional direction of rotation of the right-hand skirt.

When using the device 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) the nozzle blocks used, i.e. either NI and N2 together, or NI alone, or N2 alone; and (3) pressurized air pressure. These parameters are summarized in Table 1 against the diagram shown in Figure 3 and in Table 2 against the diagram shown in Figure 4.

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

Configuration- Wire Used Pressure1 Hairs of 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 NI 1.4 35 , 82 10 5 Normal NI 2.8 36.8 6 Normal NI 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 Kååntein. N1N2 1.4 20.85 11 Kååntein. N1N2 2.8 20.85 12 Kååntein. N1N2 4.2 24.35 13 Kååntein. NI 1.4 29.33 14 Kååntein. NI 2.8 20.4 20 15 Kååntein. NI 4.2 16.71 16 Kååntein. NI 5.5 15.54 17 Kååntein. NI 6.9 12.37 18 Kååntein. NI 7.2 8.65 19 Kååntein. N2 1.4 23.54 25 20 Kååntein. N2 2.8 20.2 21 Kååntein. 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 Applied Pressure * Hair of wire 5 number direction nozzle (psi) per retainer 1 Normal N1N2 1.4 9.47 2 Normal N1N2 2.8 10.91 3 Normal N1N2 4.2 11.85 4 Normal NI 1.4 16.7 10 5 Normal Ni 2.8 17.71 6 Normal NI 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 Kååntein. N1N2 1.4 11.36 11 Kååntein. N1N2 2.8 10.44 12 Kååntein. N1N2 4.2 12.81 13 Kååntein. NI 1.4 12.66 14 Kååntein. NI 2.8 10.18 20 15 Kååntein. NI 4.2 9.19 16 Kååntein. NI 5.5 7.25 17 Kååntein. NI 6.9 5.62 18 Kååntein. NI 7.2 5.58 19 Kååntein. N2 1.4 10.72 25 20 Kååntein. N2 2.8 11.31 21 Kååntein. 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 information depicted in Figure 3 relates to 35/1 combed cotton. Of the 21 tests listed in Table 1, a total of 18 tests had achieved reduced hairiness compared to normally twisted yarn. Comparing the halves 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 other direction of the wire through the nozzle NI.

Correspondingly, the diagram shown in Figure 4 relates to a 35/1 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 of the 300 m sample was 4.81, while that of the spun yarn was 14.88 for the 200 m sample. Of these 21 experiments shown in Fig. 4, experiments 4 and 18 showed reduced hairiness in the experiment with twisted yarn compared to the normally twisted yarn 15. Experiment 18 shows almost the same hairiness in hairs per meter in the opposite direction of the wire at a pressure of 733 kPa through the nozzle Ni.

Randomly selected yarns were also twisted using 20 Murata air spray nozzles 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 65/35 PC: llå; 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 wire 3 and 4 of Figures 30 passing through the nozzle NI. These results show a tentatively improved result at higher pressures.

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

The inverse NI was constructed with the intention of allowing a larger amount of air to contact the wire and thus allow an improved volume 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 thinning of the hairiness of the yarn 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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Referring to Figure 8, there is shown a diagram of waste removal efficiency using inverted 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 foregoing description of the invention shows that the surface properties of the spun yarn, and in particular the bitterness 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 indicates a new channel 30 for existing equipment when changing the surface properties of the spun yarn using an air spray nozzle. The NI nozzle, which is specially designed for removing the shells, is roughly twice as large as with a conventional rotation or any other nozzle.

Although the use of the Murata air-spray nozzle is described herein as an example, this does not mean that the other 35 12 - ', Γ · Λ Λ ~ 7 ii ό nozzles could not produce the same or even better result in the final yarn.

Although the present invention has been described in connection with specific 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 its hairiness, in which a spun bundle of yarn fibers is continuously conveyed along a defined path and through a medium-velocity vortex component which is characterized in that the vortex is parallel and normally opposite to the direction of movement of the spun yarn spool bundle, and a second component of the forward speed 10 that is opposite to the helical direction of the yarn spool bundle, and that the spun yarn-fiber bundle exits the nozzle at about 30 °. A method according to claim 1, characterized in that the medium vortex is obtained by passing compressed air to an air jet nozzle with a longitudinal central channel through which the spun bundle of yarn fibers passes. A method according to claim 1 or 2, characterized in that the spun bundle of wire fibers 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.