JPS6260485B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing processed yarn having the appearance and feel of silk spinning, in which a large number of minute loops and entanglements are formed in multifilament yarn through fluid turbulence treatment. Conventionally, various methods have been attempted to create bulky yarns similar to spun yarns by imparting loops and entanglements to multifilament yarns through fluid turbulence treatment, or methods to impart entanglements between filaments. Spun yarn-like bulky yarn and its manufacturing method are disclosed in Japanese Patent Publication No. 1984-6684 and Japanese Patent Publication No. 35-13168.
It has been proposed in the Publication No. This method is called "Taslan" processing, in which a bundle of multifilament yarns is subjected to fluid during fluid turbulence treatment, so that the single filaments constituting the multifilament yarns are separated from each other within the cross section of the fluid path. At the same time, the multifilament yarns are uniformly separated and dispersed from each other, and at the same time, they are rapidly moved around in a limited space to apply random torque, and then the multifilament yarns are quickly taken out from the fluid turbulence area, thereby creating a large number of loops. This method generates sagging and tangles, and the yarn obtained by this method has a high bulk, as shown in Figure 1-C and Figure 1-D in Japanese Patent Publication No. 35-6684. It has a similar appearance to spun yarn, but there are usually 150 to 300 loop-shaped and/or arch-shaped protruding slugs protruding from the surface of the fiber bundle.
m) x the number of filaments, and because they are coarse, the unwinding of the yarn from the package is poor. In addition, when the yarn is subjected to high-order processing such as knitting or weaving, the loop-shaped and/or arch-shaped protruding sag can become intertwined, causing single yarn breakage, or the loop-shaped and/or arch-shaped protruding sagging can occur on the knitting needle. They become tangled, resulting in markedly poor high-order processability. Furthermore, the knitted fabric obtained by knitting and weaving the yarn has poor surface quality due to the large number of coarse loops and sagging present on the surface of the knitted fabric. In addition, in order to improve the unwinding property of the yarn from the package and to reduce the number of loops on the surface of the fiber bundle to 85 (co/m) x number of filaments or less, fluid turbulence treatment is performed at an extremely small relaxation rate. Alternatively, it is effective to elongate the yarn at a high stretch rate using fluid turbulence treatment, but in the processed yarn obtained under these conditions, the unentangled portion accounts for a large proportion of the length of the yarn, making it difficult to make it into a knitted fabric. In some cases, the image becomes irritable or has an accentuated tone of poor quality. Furthermore, the number of loops where the distance between the farthest position from the fiber bundle and the fiber bundle surface is 0.6 mm or more is 50 (co/m).
In order to create a processed yarn with few large loops and good high-order processability, a higher stretching process is required, and the proportion of the unentangled portion of the multifilament yarn in the length of the yarn becomes significantly larger. , the quality of the knitted fabric becomes extremely poor. On the other hand, there is also a method of reducing the number of loops on the surface of the fiber bundle by heat treatment after fluid turbulence treatment, but in this method, the number of loops on the surface of the fiber bundle is maintained while maintaining the proportion of yarn length in the non-entangled portion of the multifilament yarn. , the number of loops is 85 (co/m) x number of filaments or less, and the distance between the farthest position from the fiber bundle and the surface of the fiber bundle is 0.6
In order to reduce the number of loops from mm or more to 50 (co/m) or less, high-temperature and long-time relaxation heat treatment is required. Therefore, the elongation of the heat-treated yarn at a load of 2 g/d on the stress-strain curve becomes significantly large, and when the yarn is subjected to higher-order processing steps such as knitting and weaving, the yarn is Elongation occurs, causing tension fluctuations, and even yarn breakage, resulting in significantly poor high-order processability, and the resulting knitted fabric has unevenness called "sink marks", resulting in poor quality. In addition, Japanese Patent Application Laid-Open No. 52-117 discloses a yarn in which entangled portions with strong entanglements and non-interlaced portions with asymmetrical spread are alternately present in irregular lengths, and a method for obtaining the yarn.
- Proposed in Publication No. 15646. The yarn obtained by this method has no loops on the surface of the fiber bundle, and although it has strong entanglements, it has an asymmetric spread in the unentangled portion, making it difficult to unwind from the package. Process passability during high-order processing such as knitting or weaving is not always good, and when knitted fabrics are made using these yarns, the knitted fabrics have a rough and hard texture without bulkiness. The bulkiness required for spinning and knitting fabrics,
It is not possible to obtain a soft feeling and an elegant glossy feeling. It is an object of the present invention to eliminate the drawbacks of the prior art, to have a spun yarn-like appearance and feel, especially silk-like appearance, and to have good unwinding properties of the yarn from the package during knitting and weaving. The purpose of the present invention is to provide a method for producing silk spun processed yarn that has excellent process passability. In order to achieve the above object, the present invention has the following configuration. That is, after the multifilament yarn is subjected to a wetting process, a fluid with a relaxation rate of 8% or more and 23% or less and a fluid pressure of 3.0 Kg/cm ² (G) or more is supplied to a fluid turbulence area where it is ejected and looped. When generating entanglements or entanglements, fluid is injected onto a plane that forms a part of the yarn path in the fluid turbulence area and is opposite to the direction in which the fluid is injected into the fluid turbulence area, and the multifilament yarn is injected onto the plane. The fibers are opened and vibrated while being pressed against each other to quickly take them out of the fluid turbulence area and generate loops and entanglements. By adopting the above configuration, the present invention provides a multifilament in which portions having loops and entanglements and portions substantially having no loops and entanglements are irregularly present along the length direction of the yarn. , the number of loops protruding from the surface of the filament fiber bundle is 3 (co/m) x number of filaments or more, 85
(co/m) x number of filaments, and the number of loops in which the distance between the farthest position from the fiber bundle and the surface of the fiber bundle among the protruding loops is 0.6 mm or more is 50 (co/m) or less In addition, the length of the portion having substantially no loops or entanglements is 10 mm or more, but the proportion of the length of the yarn is 20% or less, and furthermore, the stress-strain curve has a load of 2 g/d. It is possible to obtain silk spun processed yarn with an elongation of 16% or less. Note that in the above, the fiber bundle surface is a virtual surface excluding loops and sagging. Figure 1-A and Figure 1-
B is a model diagram showing the structure of a yarn obtained by the present invention. As shown in Figure 1-A, the filaments that constitute the yarn obtained by the present invention are mixed with each other, intertwined with each other, and there are many micro loops 1 protruding from the surface of the fiber bundle. The part (entangled part K) and the part (unentangled part H) where each filament is substantially not entangled and there are no micro loops 1 protruding from the surface of the fiber bundle are irregularly arranged along the length direction of the yarn. The number of loops that are present and protrude from the surface of the fiber bundle is measured using the measurement method described later, and is equal to or greater than 3 (co/m) x number of filaments.
It is less than 85 (co/m) x number of filaments. Furthermore, the absolute value of the number of loops is 100 to 3000.
(co/m). The number of loops in which the distance M between the protruding loops that are farthest from the fiber bundle and the surface of the fiber bundle is 0.6 mm or more is 50 as measured by the measurement method described later.
(co/m) or less. Furthermore, among the portions where each filament is substantially free from entanglement and where there are no loops protruding from the surface of the fiber bundle, the portions with a length L of 10 mm or more (non-entangled portion A) account for 20% of the yarn length. It is as follows.
The number of loops protruding from the fiber bundle surface is 3 (ko/m)
× If the number of filaments is not reached, the processed yarn is knitted,
The knitted fabric obtained by weaving has a so-called "paper-like" texture with a strong metallic luster and slimy feel, and is of poor quality, with a loop count of 85 (k/m).
When the number of filaments is greater than the number of filaments, the fabric obtained from the processed yarn will have a high bulkiness and a spun yarn-like appearance and feel, but since there are many protruding loops on the surface of the fabric, the fabric will have a glossy appearance. The result is a fabric with a texture that is different from that of spun silk, which has a thick, fluffy feel and is inferior in quality. If the number of loops in which the distance between the farthest position from the fiber bundle and the surface of the fiber bundle is 0.6 mm or more exceeds 50 (co/m), the unwinding property of the yarn from the package will deteriorate, and at the same time, the yield from the processed yarn will deteriorate. The rough loops on the surface of the knitted fabric become noticeable and the surface quality of the knitted fabric deteriorates. In addition, if the ratio of a portion of 10 mm or more that is substantially free of loops and entanglements (non-entangled portion A) to the length of the yarn exceeds 20%, the knitted fabric obtained from the processed yarn is subjected to dyeing and high-order processing. In this case, the result is a fabric of poor quality with an accentuated dyed irritability and dullness. Further, the processed yarn obtained by the present invention has an elongation of 16% or less at a load of 2 g/d in the stress-strain curve. If the elongation at a load of 2g/d exceeds 16%, when the processed yarn is subjected to higher-order processing such as knitting and weaving, the various tensions applied to the yarn as it passes through various processes such as knitting and weaving. As a result, yarn elongation occurs, causing tension fluctuations in various processes of knitting and weaving, and even yarn breakage, resulting in extremely poor high-order processability. Unevenness called "sink marks" occurs in the fabric, degrading the quality of the knitted fabric. Furthermore, the processed yarn obtained by the present invention has a retention rate of loops and entanglements of 50 when the processed yarn is stretched under a load of 0.5 g/d in the apparatus shown in FIG.
% or more. 50% loop and tangle retention
If the number is smaller, the various tensions applied to the yarn during knitting, weaving, etc. will unravel the loops and eliminate the loops, so the number of protruding loops and the portion without loops or entanglements (non-entangled portion H) will be reduced. ) in the yarn length may not satisfy the required range in the knitted fabric, and the knitted fabric obtained from the processed yarn has dyed irritation, dullness, metallic luster, slimy feel, etc. There is a possibility that the fabric will be of inferior quality. The number of protruding sagging in filaments and filament groups where the distance L' between the farthest position from the fiber bundle surface and the fiber bundle surface is 1.5 mm or more is 1.0 (co/m) using the measurement method described later. It is as follows. The number of protruding bulges with a distance of 1.5 mm or more between the farthest position from the fiber bundle and the fiber bundle surface is 1.0
If the amount is more than (1/m), the unwinding property of the yarn from the package cage deteriorates, and at the same time, high-order processability such as knitting and weaving tends to deteriorate. It is preferable that the textured yarn obtained by the present invention has a substantially uniform heat shrinkage rate along its length. Next, the method for producing silk spun processed yarn of the present invention will be specifically explained with reference to the drawings. FIG. 2-A and FIG. 2-B are schematic diagrams of steps showing an example of the method for producing yarn of the present invention. The present invention will be explained along with the steps. First, the multifilament undrawn yarn 4 is drawn using the supply roller 5, the drawing pin 6, and the drawing roller 7.
The supply roller 5 is preferably one that nips the rubber surface. Next, the yarn is supplied in excess to the fluid turbulence treatment nozzle 9 due to the difference in circumferential speed between the drawing roller 7 and the roller 10, and is subjected to fluid turbulence in this nozzle to form a fiber bundle. The filament is spread apart along a plane opposite to the direction in which the fluid is jetted, vibrates and undergoes random migration, and is then jetted out of the nozzle and quickly taken out from the fluid turbulence area to form loops and entanglements. At this time, the direction in which the yarn is taken out from the fluid turbulence area is the fluid jetting direction from the yarn path 18 (the axial direction of the yarn path).
In order to form uniform entanglements and loops, it is preferable that the direction is substantially perpendicular to the direction of the fluid jet and the same direction as the fluid jet direction from the fluid jet hole 19 to the yarn path (see FIG. 5). The fluid turbulence treatment nozzle is shown in Fig. 2 A and B.
It is preferable to provide a collision plate 9' on the nozzle exit side as shown in FIG. 1 to reduce the number of loops larger than 0.6 mm. The yarn leaving the roller 10 is wound up as it is by the winding device 13, but as shown in FIG. , it is preferable to wind it up with a winding device 13. When the heat treatment is performed in this manner, the coarse loops generated in the fluid turbulence area are thermally contracted due to the thermal contraction effect of the yarn, becoming preferable minute loops, and the strength of the entanglement is improved. In the manufacturing method of the present invention, the treatment in the fluid turbulence treatment nozzle 9 must be performed in an oversupply state, and the relaxation rate must be in the range of 8% or more and 23% or less, preferably More than 10
Less than 20%. Further, the pressure of the fluid supplied to the fluid turbulence treatment nozzle must be 3.0 kg/cm ² (G) or higher, preferably 4.0 kg/cm ² (G) or higher. When the relaxation rate is less than 8%, the proportion of the length of the yarn that is substantially free of loops and entanglements (unentangled portion A) exceeds 20%, and the number of protruding loops is 3 (unentangled portion A). /M) x number of filaments may occur. When the relaxation rate exceeds 23%, the stress-strain curve becomes 2g/
d The elongation under load exceeds 16%, the number of protruding loops exceeds 85 (co/m) x the number of filaments, and the distance between the farthest position from the fiber bundle and the surface of the fiber bundle is 0.6
There are cases where the number of loops larger than mm exceeds 50 (co/m). When the pressure of the fluid is lower than 3.0 Kg/cm ² (G), the proportion of the part that does not have loops or entanglements (non-entangled part A) in the length of the yarn exceeds 20%, and the most The number of protruding saggings where the distance between the distant position and the fiber bundle surface is 1.5 mm or more is 1.0
(co/m), and the retention rate of loops and entanglements tends to be less than 50%.
The amount of fluid supplied to the fluid turbulence area is 600 to 2000 when expressed as {denier of supplied yarn (D}) x {fluid flow rate required to process 1 kg of yarn (Nm ³ /Kg)}
(D・Nm ³ /Kg), preferably 900 to
More preferably, it is 1800 (D·Nm ³ /Kg). This value is about 1/5 to 1/2 of that normally used in "Taslan" processing, indicating that processing can be performed with an extremely small amount of fluid usage. The fluid turbulence treatment nozzle used in the present invention has a plane that forms a part of the passage and faces the direction in which the fluid is jetted, and presses the multifilament yarn against the plane by jetting the fluid. It has a mechanism that spreads each filament constituting the multifilament yarn separately along a plane, vibrates it, and randomly migrates it, and has a mechanism that jets the multifilament yarn out of the nozzle by fluid jetting. It is necessary. Specific examples will be explained below with reference to the drawings. Figure 4-A
4 is a schematic vertical cross-sectional view of a fluid turbulence treatment nozzle preferably used in the present invention, and FIG.
FIG. 2 is a schematic diagram of a cross section taken along line X-X′ in FIG. The fluid turbulence treatment nozzle is composed of two parts, a housing 23 and a piece 24, as shown in FIG.
A plane 22 facing the fluid ejection direction forming a part of the plane 22 is formed. Housing 23
has a fluid introduction hole 20, a fluid injection hole 19, and a yarn passage groove that forms the yarn passage 18, and the piece 24 is a plate-shaped body having a smooth plane to form one plane of the yarn passage 18. It is. In FIG. 4, a recess is provided in the housing to form a thread passage, but a recess may be provided in the piece or in both the housing and the piece to form a thread passage. In addition, the width of the yarn passage shown by a in Figure 4-B provides uniform entanglement and forms minute loops, and when the total denier of the multifilament yarn supplied to the fluid turbulence area is D, It is preferably √D/20 mm or more and √D/3 mm or less, more preferably √D/15 mm or more and √D/5 mm or less. The fluid injection hole 19 is required to have the function of entangling the yarn and jetting the yarn out of the nozzle, so it is bored at an angle α with the yarn passage 18.
The spray angle α is preferably 30° or more and 70° or less from the viewpoint of entangling effect and yarn feeding effect. In addition, the fluid turbulence treatment nozzle has two fluid injection holes or more fluid injection holes toward the center of the yarn path plane 22 as shown in FIG. 4-C, instead of having the shape as shown in FIG. 4-B. It is also possible to use one having injection holes, and in the case of two fluid injection holes, the fluid injection hole narrowing angle β is preferably 20° or more and 40° or less. In the fluid turbulence treatment nozzle, the fluid first enters the fluid introduction hole 20, passes through the fluid injection hole 19, and is injected into the yarn passage 18. Here, it collides with the multifilament yarn supplied from the entrance of the yarn passage 18, and the sixth
As shown in the figure, each filament 25 constituting the multifilament yarn is spread, vibrated, rotated and randomly migrated while pressing the multifilament yarn against a plane 22 facing the fluid jetting direction by a fluid jetting action. The fluid is jetted out of the nozzle by the yarn feeding effect caused by the jetting angle α of the fluid jetting hole 19. In conventional Taslan processing, in the fluid turbulent region, each filament that makes up the multifilament yarn is separated and dispersed throughout the cross section of the fluid passage, and is moved around rapidly to apply random torque to generate loops and entanglements. However, since the movement of the filament within the fluid passage is large, the size of the loop has to be large. On the other hand, in the present invention, in the fluid turbulence region, each filament is opened separately while pressing the multifilament yarn against a plane facing the fluid jet direction.
It vibrates and migrates randomly to generate loops and entanglements, and because the filament moves only in a space very close to one plane in the fluid passage and is small, the size of the loop is small. be. When feeding the multifilament yarn to the fluid turbulence area in the fluid turbulence treatment nozzle, the multifilament yarn is fed from the direction opposite to the fluid injection hole with respect to the yarn path at the yarn feeding angle θ shown in FIG. It is preferable to feed the filament while bending it at an angle of 30° to 90° in order to form a fulcrum when the filament is opened, vibrated and migrated, thereby enhancing the entangling effect. More preferably, the angle is 45° to 90°. Furthermore, if the multifilament yarn is moistened with the moisture applying device 8 before being supplied to the fluid turbulence treatment nozzle 9, the effect of the fluid turbulence treatment will be improved, the strength of entanglement between the filaments will be improved, and the yarn This is necessary because it improves the uniformity of the entanglement along the length. Further, although there are no particular restrictions on the shape of the heating body used in the heat treatment preferably used in the method for producing silk spun processed yarn of the present invention, a method in which the heating body is caused to run in contact with the heating body is preferable. In this case, a flat hot plate with or without grooves is preferably used, but any shape such as a pin or saddle type hot plate can be used. The temperature of the heating body may be any temperature within the range of at least the melting point at which the coarse loops and sag generated in the fluid turbulence treatment nozzle can be reduced or eliminated by thermal contraction and the strength of the entanglement can be improved. When Ts is the softening point of the polymer forming the multifilament, it is preferably at least (Ts-110°C) and at most (Ts-30°C). heating element temperature
If the temperature is lower than Ts - 110℃, the reduction and elimination effect due to heat shrinkage of coarse loops and sagging, and the effect of improving the entanglement strength will be significantly reduced. The dyeing process causes defects such as irritation and uneven dyeing in knitted fabrics, which deteriorates the quality of the knitted fabrics. The contact time with the heating element is preferably 0.1 seconds or less in order to suppress the increase in elongation at a load of 2 g/d in the stress-strain curve. Further, the boiling yield of the processed yarn is preferably in the range of 3 to 13% in order to finish the knitted fabric with a good texture. Note that if the fineness of the loop is increased by 1.5 times or more when the loop is heat-shrinked by heat treatment, the processed yarn will have a rough and hard feel, which is not preferable. The multifilament yarns used in the present invention include regenerated protein, cellulose (rayon), cellulose ester multifilament yarns, and thermoplastic multifilament yarns, with thermoplastic multifilament yarns being preferred. Thermoplastic multifilament yarns include polyester, polyamide, polyolefin, polyvinyl, and the like, with polyester and polyamide being particularly preferred. For example, polyester type uses terephthalic acid as the main dibasic acid,
The glycol may be one in which ethylene glycol or cyclohexanedimethanol is used as the main glycol, or one in which ethylene oxybenzoate is used and copolymerized with various ester-forming compounds. Examples of polyamides include polyε-caproamide or polyhexamethylene adipamide;
Copolymers of various amide-forming compounds may also be used. Further, as long as the effects of the present invention are not impaired, the thermoplastic multifilament yarn may contain known modifiers such as pigments, antistatic agents, flame retardants, and dye-seating components, and the cross-sectional shape may be round. It may be a strange shape. The thermoplastic multifilament yarn used in the present invention has a boiling water shrinkage rate of 5% or more after fluid turbulence treatment and immediately before heat treatment. It is preferable from the viewpoint of sufficiently exhibiting the effect of improving the entanglement strength, and more preferably 7% or more. Also,
Since the filaments constituting the multifilament yarn have a fine denier and a large number of filaments, the entanglement strength is improved, so the single yarn denier is preferably 3.2 d or less, more preferably 2.1 d or less, and the number of filaments is 24 or more. is preferred. Furthermore, it is also possible to supply mixed fibers of different deniers or different heat shrinkage rates, or to supply the fibers in a mixed manner.
In addition, the total denier of the multifilament yarn is preferably 20 to 200 deniers.
It can be more preferably applied to 40 to 150 deniers. In addition, as a starting material in the method for producing silk spun processed yarn of the present invention, as shown in Figure 2-A and Figure 2-B, multifilament undrawn yarn may be used, but drawn yarn is used as a starting material and processed. This also includes cases where The effects of the present invention are that, compared to the conventional "Taslan" yarn proposed in Japanese Patent Publication No. 35-6684, etc., the yarn is superior in unwinding properties from the package and in passing through higher-order processing processes such as knitting and weaving. , and has a soft feel and flexibility that cannot be obtained with the aforementioned "Taslan" yarn or the interlaced yarn proposed in JP-A-52-15646.
Silk spun processed yarn for knitting fabrics that has good drapability, moderate shear, deep color effect, and elegant silk-like luster can be obtained, and its manufacturing method is stable. Twisted yarn-like silk-spun processed yarn with loops and entanglements can be produced at low cost under stable processing conditions. Next, we will discuss how to measure the number of loops and the number of loops of 0.6 mm or more, how to measure the protruding sag of a filament and/or a group of filaments, the length of substantially loops of 10 mm or more, the untangled part (unentangled part A), and Measuring method of proportion to yarn length (unentangled part A ratio), measuring method of elongation under 2g/d load, measuring method of loop and entanglement retention rate, measuring method of relaxation rate during fluid turbulence treatment is shown below. [Method for measuring the number of loops and the number of loops larger than 0.6 mm] Approximately 15 to 20 cm of processed yarn was placed between two transparent flat plates under a tension of 0.1 g/d and magnified 17 times with a magnifying glass. Make a video. In the present invention, in such an image, the distance N between the positions of both ends of the loop on the fiber bundle surface of the loop protruding from the fiber bundle surface as shown in filament 2 in FIG. A loop is one in which the ratio N/M of the distance M between the two is 4 or less. Note that an arch is one in which N/M is larger than 4. The number of loops it takes is 10
The operations of reading per cm were randomly sampled.
This is done for 10 samples, averaged to give the number of loops per 1m, and multiplied by the number of filaments to determine the number of loops. Distance M between the farthest position from the fiber bundle surface in the loop and the fiber bundle surface
The number of loops of 0.6 mm or more is determined by measuring with a caliper and reading the same for loops of 0.6 mm or more. [Method for measuring the number of protruding sagging of filaments and filament groups] In the present invention, protruding sagging refers to those that protrude from the fiber bundle surface, that is, the distance between the farthest position from the fiber bundle surface and the fiber bundle surface in a loop or arch. Refers to items with a diameter of 1.5 mm or more. The number of protruding sag is measured by the following method. Observe 10 m of processed yarn on black paper under a tension of 0.1 g/d while magnifying it from directly above with a magnifying glass, and use a caliper to measure the distance between the farthest point from the fiber bundle surface and the fiber bundle surface by 1.5 mm. Read the number of filaments and sagging of filament groups of the above items.
However, a filament group refers to a group of filaments in which a plurality of filaments are located at exactly the same position and have the same shape, and the number of filaments is unknown. Perform this operation on 10 randomly sampled samples, and take the average number of pieces per 1 m. [Method for measuring the length of the unentangled part A and the ratio of the unentangled part A] One processed yarn with a length of 110 to 120 cm is crimped to one end of a horizontally arranged measuring plate with a length of 1 m. to the thread
Attach a weight calculated to apply a load of 0.01 g/d to the other end, pass the string through the pulley, and hang it freely beyond the edge of the measuring plate. Pass a smooth, pointed pin vertically through the part where the distance between the loops is 10 mm or more according to the scale of the measuring plate, and move it slowly back and forth by hand to find the length of the untangled part in mm. Repeat this operation for all locations where the distance between the loops is 10 m or more within the sample length of 1 m, and calculate the sum of the lengths of the untangled portions in 1 m of processed yarn. The force applied when passing the pin through the sample thread must be selected so as not to cut or stretch the filament. This operation is performed on 10 randomly sampled samples, and this is averaged to determine the length of the unentangled portion A per 1 m. In addition, the unentangled portion A ratio is determined by the following formula. Ratio of unentangled parts A (%) = Sum of lengths of unentangled parts A (mm) / 1000 (mm) Ten
cm/min, chart speed 20cm/min, sample length 20cm
Under these conditions, draw stress-strain curves for five randomly sampled samples. The elongation of the sample processed yarn under stress equivalent to 2 g/d is read from the stress-strain curve obtained and averaged to determine the elongation under load of 2 g/d. [Method for measuring retention of loops and entanglements] In the process shown in Figure 3, the processed yarn is
The film is rewound onto a winding device 17 via a supply roller 15 at a rate of 45 m/min under a tension equivalent to 0.5 g/d adjusted by a tensor 16. Using the rewound processed yarn, measure the number of loops and the length of the unentangled part A according to the method described above, and measure the obtained number of loops and the length of the unentangled part A at a load elongation of 0.5 g/d. Later loop number unentangled part A
Let the length be . Further, the length of the unentangled portion A of the loops of the processed yarn subjected to rewinding is defined as the length of the unentangled portion A of the supplied yarn loops, and the retention rate of each loop is determined by the following equation. Loop number retention rate (%) = 0.5 g/d load Number of loops after elongation (co/m) / Supply yarn loop number (co/m) x 100 Entanglement retention rate (%) = 1000 - 0.5 g/d load Length of unentangled part A after elongation (mm)/1000 - Length of unentangled part A of supplied yarn (mm) x 100 [Relaxation rate during fluid turbulence treatment] Roller feeding yarn into fluid turbulence treatment area and taking out yarn The surface speed of the roller is V ₁ , V ₂ , m/min, respectively.
Relaxation rate (%) = V ₁ - V ₂ /V ₁ . The present invention will be specifically explained below with reference to Examples. Example 1 An undrawn polyethylene terephthalate yarn having an intrinsic viscosity [η]=0.60, a 225 denier 36 filament, and a triangular cross section was processed by the manufacturing process shown in FIG. 2-A and FIG. 2-B. The stretching pin 6 was a 100° C. heat pin, and the film was stretched 3 times, and the surface speed of the stretching roller 5 was 300 m/min. The fluid turbulence treatment nozzle uses a nozzle having the shape shown in Fig. 4A and C in combination with a collision plate, and the thread passage 18 of the nozzle is rectangular with a width (a) of 0.9 mm and a height (b) of 1.5 mm. The injection angle of the fluid injection hole is the injection angle (α)
60°, and the narrowing angle (β) was 30°. Further, the yarn feeding angle (θ) was set to 90°. The air pressure supplied to the fluid turbulence treatment nozzle and the relaxation rate between the stretching roller 7 and the roller 10 were set to the conditions of Experiment Nos. 1 to 16 shown in Table 1. In addition, during the fluid turbulence treatment, water was applied to the yarn at a rate of 5 c.c./min by the moisture applying device 8. Experiment No. in Table 1.
The heat treatment after the fluid turbulence treatment in steps 14 to 16 reduces the circumferential speed difference between the roller 10 and the take-out roller 12.
Fixed length heat treatment was performed at 0 m/min. Further, the heating body 11 was a flat hot plate with a weld length of 250 mm, and the temperature of the heating body was 200°C. Immediately before winding, an oil agent containing at least 90% by weight of mineral oil with a viscosity of 70 sec (30°C) is applied to the processed yarn weight at 1%, and a straight-rolled cheese (with a winding angle of 15° and a winding width of 150 mm) is applied. 2Kg roll) with a winding tension of 11g. Table 1 shows the number of loops, the number of loops of 0.6 mm or more, the number of protruding sag, the elongation under a load of 2 g/d, the non-entangled portion A ratio, the loop retention rate, and the entanglement retention rate of the obtained processed yarn. As is clear from Table 1, in order to stably obtain a good spun processed silk yarn, which is the object of the present invention, it is necessary to set the relaxation rate to 8% or more and 23% or less, and preferably 10% or more and 20% or less. The fluid pressure supplied to the fluid turbulence treatment nozzle is
3.0Kg/cm2 or ^more is required, preferably 4.0Kg/cm2 or more.
cm ² (G) or more. These 16 levels of processed yarn were used as warp and weft yarns to form a plain weave of 80 yarns/inch in the warp and 70 yarns/inch in the weft, and processed using the usual dyeing process for polyester. Among the fabrics obtained, the fabrics of Experiments No. 1 and 2, in which the loop retention rate and entanglement retention rate were insufficient, and Experiment No. 6, in which the number of loops was small and the unentangled portion A ratio was large, had a strong metallic luster. It was irritated, thin, and lacked bulk, softness, and elegant luster. In addition, the fabric obtained in Experiment No. 13 has many small loops and large loops on its surface.
It lacked the luster that is the texture of a highly bulky spun yarn, and had an inferior texture that was completely different from the silk texture targeted by the present invention, which emphasized the texture. The fabrics obtained in Experiments No. 3 and No. 7 had a slightly noticeable metallic luster and irritability, but were at a practical level, while the other fabrics had deep hues, an elegant luster, and a moderate amount of bulk. It had the appearance and feel of spun silk with softness and softness. In addition, the processed yarns of Experiment Nos. 6 to 16 were processed at a yarn speed of 16 m/m using a double twister (WT) manufactured by Murata Machinery.
min, spindle rotation speed 8000r.pm, twist number
Under conditions of Z2500T/m, 50 rolls of 2 kg cheese of each level were subjected to an unwinding test. Table 1 shows the number of yarn breakages in the unwinding test. Experiment No. 13 where the number of loops of 0.6 mm or more exceeds 50 (co/m) or the number of protruding sag exceeds 1.0 (co/m), and the number of protruding sag exceeds 1.0 (co/m)
In Experiment No. 6, which exceeded the standard, there was a clear difference compared to other standards, and the unwinding performance was poor.

【table】

[Table] Example 2 210 denier 34 filament as supplied yarn,
Processing was carried out in the same manner as in Example 1 using undrawn nylon-6 yarn with a triangular cross section. The stretching ratio was 3 times, and the surface speed of the stretching roller 7 was 300 m/min. The fluid turbulence treatment nozzle used in Example 1 shown in FIGS. 4A and 4C was used, the conditions for adding moisture and adding oil were the same as in Example 1, and the winding tension was 10 g. Further, the air pressure supplied to the fluid turbulence treatment nozzle and the relaxation rate between the stretching roller 7 and the roller 10 were set to the conditions of Experiment Nos. 17 to 19 shown in Table 2. Table 2 shows each characteristic value of the obtained processed yarn. The processed yarns obtained at all levels had sufficient yarn properties to achieve the object of the present invention. The obtained processed yarns were used as warp and weft yarns to form a plain weave of 80 yarns/inch in the vertical direction and 70 yarns/inch in the horizontal direction, and were processed using a normal dyeing process for nylon-6. All of the obtained fabrics were of excellent quality, having a deep color, an elegant luster, a soft feel, and an appropriate bulkiness, and the appearance and feel of spun silk.

[Table] Comparative Example 1 Using a 225 denier 36 filament, undrawn polyethylene terephthalate yarn with a triangular cross section, the "Taslan" nozzle shown in Figure 4 of USP 3, 545, 057 specification was used as a fluid turbulence treatment nozzle. Air pressure and relaxation rate were measured in Experiments No. 20 to 23 in Table 3.
The fabric was processed in the same manner as in Example 1 under the same conditions as in Example 1, and weaving and dyeing were carried out under the same conditions. For Experiment No. 22, relaxation heat treatment was performed at a relaxation rate of 4% using a tube heater with a heating element temperature of 200°C and a heating element length of 1.0 m, and Experiment No. 23
For heating element temperature 200℃, heating element length 0.60m
Tension heat treatment was performed using a hot plate with a stretching rate of 3%. Table 3 shows each characteristic of the obtained processed yarn.
As is clear from Table 3, the processed yarns obtained in Experiments Nos. 20 and 21 had an extremely large number of loops, especially coarse loops of 0.6 mm or more, and a large number of protruding sag, making it difficult to unwind the yarn from the package. It had poor properties and poor process passability in the weaving preparation process and the weaving process. In addition, the obtained woven fabric has many loops and coarse loops on the surface, is not shiny, has high bulk, and has a fluffy, spun yarn-like texture.
The silk spun fabric that is the object of the present invention was completely different and of inferior quality. Further, the processed yarn obtained in Experiment No. 21 had a significantly high elongation at a load of 2 g/d due to the intensive relaxation heat treatment, and had poor process passability in the weaving preparation process and the weaving process. The resulting fabric was of extremely poor quality with noticeable unevenness and uneven dyeing defects. The processed yarn obtained in Experiment No. 22 had an extremely large unentangled portion A ratio, and many long-legged fluffs were observed on the surface of the fiber bundle, and conspicuous uneven entanglement was observed in the length direction of the yarn. The fabrics obtained from the processed yarns were of extremely poor quality, with defects such as uneven metallic luster, irritability, uneven dyeing, and surface fuzz.

【table】 [Brief explanation of the drawing]

Figure 1-A is a model diagram showing the structure of the yarn obtained by the present invention, Figure 1-B is an explanatory diagram of the method for measuring the number of loops and protruding sag, Figure 1-C, and Figure 1-D are A schematic diagram showing the yarn form of a conventional fluid turbulence treated yarn, Figure 2-A and Figure 2-B are schematic diagrams showing the embodiment of the present invention, and Figure 3 is a diagram showing the yarn form used in measuring the retention rate of loops and entanglements. FIG. 4 is a schematic cross-sectional view showing an example of a fluid turbulence treatment nozzle used in the present invention, and FIG. 4A is a longitudinal cross-sectional view;
Figure 4-B is a schematic diagram showing the X-X' cross section in Figure 4-A, Figure 4-C is a schematic diagram of another fluid turbulence treatment nozzle, and Figure 5 is a diagram showing the fluid turbulence treatment nozzle. FIG. 3 is a schematic diagram showing the feeding direction and the method of taking out the yarn. FIG. 6 is an explanatory view showing the position of the filament in the thread passage in the fluid injection hole. 1: loop, 2: filament loop, 3:
Arch, 4: Multifilament undrawn yarn, 5:
supply roller, 6: stretching pin, 7: stretching roller, 8: water application device, 9: fluid turbulence treatment nozzle,
9': collision plate, 10: roller, 11: heating element,
12: Take-out roller, 13: Winding device, 1
4: Processed yarn obtained in the present invention, 15: Supply roller, 16: Tenser, 17: Winding device, 18: Yarn passage, 19: Fluid injection hole, 20: Fluid introduction hole, 2
1: Multifilament yarn, 22: Plane facing the fluid injection hole, 23: Housing, 24: Piece, 25: Filament.

Claims (1)

[Claims] 1. A fluid turbulence region in which a fluid with a fluid pressure of 3.0 Kg/cm ² (G) or more is ejected at a relaxation rate of 8% or more and 23% or less after a multifilament yarn is subjected to a wetting process. When the fluid is supplied to the fluid turbulence region to generate loops and entanglements, the fluid is injected onto a plane that forms part of the yarn path in the fluid turbulence region and is opposite to the direction in which the fluid is injected into the fluid turbulence region. A method for producing silk spun processed yarn, characterized in that the multifilament yarn is opened and vibrated while being pressed against it to quickly take it out of a fluid turbulence area and generate loops and entanglements. 2. The silk according to claim 1, in which the multifilament yarn is fed into the fluid turbulence area from a direction opposite to the fluid injection hole with respect to the yarn path at an angle of 30 to 90 degrees with respect to the yarn path axis. A method for producing spun processed yarn. 3 After applying a wetting process to the multifilament yarn, ^a loop or When generating entanglement, fluid is injected onto a plane that forms part of the yarn path in the fluid turbulence area and is opposite to the direction in which fluid is injected into the fluid turbulence area, and the multifilament yarn is jetted onto the plane. A method for producing silk spun processed yarn, which comprises opening the yarn while pressing it, vibrating it, quickly taking it out of the fluid turbulence area to generate loops and entanglements, and then heating it.