JPS6151053B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a crimped yarn in which wound yarns are alternately twisted around a core yarn so that the left and right twist directions are different, by a false twisting process.

Conventionally, by using the false twisting method and using thermoplastic fiber drawn yarn as the supplied raw yarn, it is possible to create variable yarns, slub yarns, etc. in which wound yarns are alternately wound around a core yarn so that the left and right twist directions are different. A manufacturing method is proposed. If left as is, the wound yarn may sag or shift due to ironing during turning in the knitting preparation process, in the thread path during knitting, or during the weaving preparation process and passing through the reed during weaving. There were problems with the windability of the wound yarn, such as the difficulty of making it into a knitted fabric while maintaining its appearance and texture. There were also problems with the covering properties of the wound yarn, texture such as a shiny feel, and aesthetic dyeability.

Such conventional examples include Japanese Patent Publication No. 47-49459, Japanese Patent Publication No. 28018-1982, Japanese Patent Publication No. 46866-1987, and the like. However, in the conventional example, since a drawn yarn is used as the wound yarn, the above-mentioned drawbacks have not been improved. Further, as an example of a prior application, there is Japanese Patent Application No. 1973-64753, but the method of supplying the yarn is different and there are still problems.

Therefore, the inventors of the present invention have found that if a winding yarn is used that has extremely excellent heat setting properties, but is not easily fused, such as undrawn yarn, even when subjected to normal false twisting, the above-mentioned drawbacks can be avoided. We believe that we can improve
After focusing on the use of highly oriented polyester undrawn yarn as the winding yarn and conducting extensive research, we discovered that it was possible to obtain a yarn with very good windability and a new appearance and texture that had never existed before. invention has been achieved.

The purpose of the present invention is to prevent the wound yarn from sagging or easily shift during post-processing, as in the conventional method, to provide good covering properties for the wound yarn, The thread is wrapped around the core thread,
A non-bulky composite false-twisted crimped yarn that alternately changes left and right twist directions to provide an unprecedented strong twist yarn-like yarn that is tightly wound, has a crisp feel, and has a design effect after dyeing. is to provide.

In order to achieve the above object, the present invention has the following configuration. That is, the present invention provides a composite false-twisted crimped yarn consisting of a drawn thermoplastic synthetic fiber yarn and a highly oriented undrawn polyester yarn, in which: (a) the drawn thermoplastic synthetic fiber yarn is a core yarn, and the highly oriented undrawn polyester yarn is a core yarn; It has a core-sheath structure that is a sheath yarn, (b) the sheath yarn has a thicker fineness than the core yarn, and (c) the sheath yarn is twisted around the core yarn by periodically changing the left and right twisting direction. A composite false-twisted crimped yarn characterized by:

In the present invention, the thermoplastic synthetic fiber drawn yarn is
Refers to drawn yarn such as polyester, nylon 6, nylon 66, etc., which is normally used as a feed yarn for false twisting.

In addition, the highly oriented undrawn polyester yarn refers to a yarn with a much lower degree of orientation than the drawn thermoplastic synthetic fiber yarn, and has a birefringence of 15 to 60× when spun at high speed.
10 ^-3 undrawn polyester yarn that has been false twisted without being actively drawn. In other words, instead of using the conventional undrawn polyester yarn obtained at a spinning speed of 1500 m/min or less as the raw yarn, it is a highly oriented undrawn yarn obtained by increasing the spinning speed and spinning all at once. Compared with drawn yarn, it exhibits a denser phenomenon, and the elongation is at least 80%
A highly oriented undrawn polyester yarn is used which has the above properties, has extremely excellent heat setting properties, and does not easily fuse on a hot plate under normal false twisting conditions. In other words, undrawn polyester yarn (birefringence of 5 to 10 x 10 ^-3 ) is completely amorphous, so it usually fuses instantaneously on a heating plate under false twisting conditions; A highly oriented undrawn yarn with a refraction of more than 60×10 ⁻³ exhibits almost the same physical behavior as a normally drawn yarn, and the desired effect of the present invention cannot be obtained.

Therefore, in the present invention, it is necessary that the drawn thermoplastic synthetic fiber yarn is the core yarn and the highly oriented undrawn polyester yarn is the sheath yarn. The reason for this is
This is to maintain high strength of the composite yarn as a whole by arranging the drawn yarn in the core yarn, and at the same time, by arranging the highly oriented undrawn polyester yarn in the sheath yarn, it exhibits dyeability and shirring feel. Furthermore, such a two-layer structured yarn also has a design yarn-like appearance, which is a feature not found in conventional products. That is, the above-mentioned highly oriented undrawn polyester yarn has good heat setting properties as well as dyeability, so that the covering structure is strong and the product properties as well as the ability to pass through higher processing are extremely excellent.

Next, in the present invention, it is necessary to set the fineness relationship such that the sheath yarn is thicker than the core yarn. This is because if the fineness of the highly oriented undrawn yarn, which is a wound yarn, is thicker than that of the drawn yarn, which is a core yarn, the covering factor will be large, and the yarn shape retention effect will also be improved. Furthermore, the appearance after dyeing is improved, and the texture is also preferable because it gives a smooth feel.

Next, in the present invention, it is necessary to have a structure in which the sheath threads are twisted around the core threads while periodically changing the left and right twist directions. Here, the fact that the left and right twist directions are changed and twisted means that the S-twist portion and the Z-twist portion are present alternately. Since the S-twist and Z-twist are twisted periodically, the sheath yarn is firmly and closely blended with the core yarn, resulting in a yarn with the texture and structure of a non-bulky, strongly twisted yarn. In this case, the sheath thread may have a single winding, or a double winding,
It may be wrapped in three or more layers. Further, the winding state of the sheath thread may be uniform or may vary locally. For example, the composite crimped yarn shown in Fig. 4 has a single layer and is almost uniformly coated, but the one shown in Fig. 5 has double wraps locally,
A triple winding is formed, and the yarn exhibits a change in the length direction. Therefore, the yarn shown in FIG. 4 is useful for fabrics that do not change much, and the yarn shown in FIG. 5 is useful as a design yarn that has changes.

Next, a method for manufacturing the composite false twisted crimped yarn of the present invention will be explained with reference to the drawings. FIG. 1 shows an embodiment of such a manufacturing method, in which a conventional false twisting machine is equipped with yarn feeding rollers 5 and 6 that can independently adjust the amount of yarn fed to the same spindle 11. It is a device. In Fig. 1, the drawn yarn 1, which will eventually become the core yarn, passes through the wire guide 3, and is supplied to the thread guide 9 via the thread guide 7 by the yarn feeding roller 5. The highly oriented undrawn polyester yarn 2 passes through a wire guide 4 and is supplied by a yarn feeding roller 6 so that the tension relationship is drawn yarn 1 > highly oriented undrawn yarn 2. As shown in FIG. In this way, the drawn yarn and the highly oriented undrawn yarn are supplied separately, but if the main enlarged view of the method shown in FIG. 1 is shown in FIG. 2, the drawn yarn 1 and the highly oriented undrawn polyester yarn 2 are twisted. False twisting is started at the rotation starting point P, and the highly oriented undrawn polyester yarn 2 is wound around the drawn yarn 1 by twisting of the false twisting spindle 11 to form one yarn. Next, the twisted form in the twisting area is thermally set by a heating plate 10, and then untwisted, taken off by a take-off roller 12, and wound up into a wind-up package 13. The false twisting spindle 11 may be any other false twisting machine as long as it has a temporary heating function.

This process will be explained in more detail, including experimental findings using polyester drawn yarn as the drawn yarn and undrawn polyester yarn with various birefringences as the wound yarn. In principle, a yarn with a small supply tension wraps around a yarn with a high supply tension, but in order to always make the yarn supply tension relationship of drawn yarn 1 > polyester highly oriented undrawn yarn 2, {(highly oriented undrawn yarn 2) Supply amount of drawn yarn/supply amount of drawn yarn)-1}×100 (hereinafter referred to as F ¹ ) is limited as follows. That is, Fig. 3 shows the birefringence of highly oriented undrawn polyester yarn and the F ¹
As shown in the range in which the effects of the ^present invention can be obtained, which is limited by 10 ³ −33} or more.

In Figure 3, the value of birefringence on the horizontal axis is 35×10 ^-3
The reason why F ¹ ≦0 is included in the following range is that the highly oriented undrawn polyester yarn in such a low birefringence region is easy to stretch, and even if the tension is low, it is easily drawn and the tension is reduced. Therefore, in this area, the tension relationship of the present invention,
That is, drawn yarn>polyester highly oriented undrawn yarn,
The relationship holds true. Further, even if the highly oriented undrawn polyester yarn in this region is slightly stretched, it remains a highly oriented undrawn polyester yarn, so that the performance aimed at by the present invention can be exhibited. Furthermore, the lower limit line of ^F1 exceeds 0 in the range exceeding 33 × 10 ^-3 horizontal axis birefringence in Figure 3, which is because the highly oriented undrawn polyester yarn becomes difficult to stretch in this range, and due to slight tension fluctuations. This is because the relationship between the core and sheath is reversed, and the tension relationship cannot be maintained within the scope of the present invention.
The above is an explanation of the lower limit line of ^F1 .

In this way, the drawn yarn satisfies the limited range of ^F1 ,
Highly oriented undrawn polyester yarn is supplied, but the reason why the wound yarn is wound tightly around the core yarn and periodically alternating the left and right twist directions is due to the following reasons. . That is, as shown in FIG. 2, the highly oriented undrawn polyester yarn 2 is wrapped around the drawn yarn 1, but as the winding continues, the tension of the highly oriented undrawn polyester yarn increases, so that the twisting starting point P is The winding tension of the highly oriented undrawn polyester yarn increases. However, when a certain limit is reached, the highly oriented undrawn polyester yarn relaxes the tension by elongation in the feeding area, so that the tension simultaneously decreases and the twist starting point P shifts its position in the opposite direction. By continuously and freely changing the position of the twisting starting point P in this way, the winding density of the highly oriented undrawn polyester yarn periodically changes from high density to low density along the longitudinal direction of the yarn. Since the highly oriented undrawn polyester yarn has excellent heat setting properties on the heating plate, its shape is very firmly fixed in that state. Therefore, during untwisting, the part with high winding density remained untwisted and tightly wound in the twisting direction, while the part with low winding density maintained a heat-set coil-like form. The twisted yarn becomes over-untwisted and wound well around the core yarn, and the wound yarn has an appearance as shown in Figure 4, tightly wrapping around the core yarn and alternately twisting in the left and right directions. A composite crimped yarn having a texture similar to that of a non-bulky, strongly twisted yarn wound periodically is obtained.

However, compared to the drawn yarn, the polyester highly oriented undrawn yarn has a larger overfeed direction, that is, F ¹
As shown in Fig. 3, if the value is greater than {(5/13) x (birefringence of highly oriented undrawn polyester yarn) x 10 ³ +45}, the tension supplied to the highly oriented undrawn polyester yarn will always be tension-free and twisting will result. All the tension is applied to the drawn yarn, and the twisting starting point P tries to obtain a stable position in the running direction of the yarn. As in this case, the highly oriented undrawn yarn is supplied to the drawn yarn in an extreme overfeed amount, and even if the highly oriented undrawn yarn is completely destroyed by single winding around the drawn yarn, it still remains relaxed. In the case of polyester yarn, double, triple and multiple winding occurs locally near the thread guide to eliminate loosening and continue winding. Since the feed amount is supplied, local multiple winding portions as described above are generated periodically. Since the winding tension of the highly oriented undrawn polyester yarn in this local multiple winding area is extremely low, it is heat-shrinked in a free state on the heating plate, making the winding very firm and partially slightly fused. Therefore, even after passing through the false-twisting spindle, it is hardly untwisted and remains as knots wound many times in the twisting direction. In addition, the part that is not wrapped multiple times retains its heat-set coil shape.
As in the case where F ¹ is less than {(5/13) x (birefringence of highly oriented undrawn polyester yarn) x 10 ³ + 45}, especially in this case, the knot parts are hardly untwisted, so the The yarn is over-untwisted to form a non-knot part that is well wrapped around the core yarn. As described above, the winding yarn as shown in Fig. 5 is tightly wound around the core yarn, and a non-bulky yarn with periodic knots and where the knots and non-knots have alternate left and right twisting directions is formed. A knotted thread is obtained.

In the above false twisting method, highly oriented undrawn polyester yarn is wound around the drawn yarn 1 on the upstream side of the heating zone, then passed through the heating zone to heat set, and then passed through a false twisting machine. However, in such false twisting, by inserting a twist in the twisting region, even if the tension relationship between the two yarns, that is, the relation of the supply amount, is limited to the shaded area in Fig. 3,
The highly oriented undrawn polyester yarn is easily drawn and is slightly drawn. Of course, the degree of stretching is much smaller than the degree of stretching in simultaneous drawing and false twisting of ordinary highly oriented polyester undrawn yarns, and the birefringence Δn of such drawing and simultaneous false twisting yarns is 135 to 135.
150×10 ^-3 , whereas the birefringence Δn of the highly oriented undrawn polyester yarn portion of the yarn of the present invention is at most 120×10 ⁻³ or less, and most of the birefringence Δn is 110×
10 ^-3 or less. Therefore, this part has good dyeability and a hard texture. Note that the manufacturing method may be other than the above-mentioned method and may be a simple alignment false twisting method if the conditions are met.

The composite crimped yarn of the present invention has an appearance and appearance at the yarn stage.
It is possible to make a knitted fabric without losing its texture through post-processing. The winding yarn is tightly wound around the core yarn by alternating the left and right twisting directions to create an unprecedented highly twisted yarn-like yarn, and it has a smooth texture and is rich in elegance. A non-bulky composite crimped yarn having knots can be obtained.
This is due to the fact that the surface is wound with highly oriented undrawn polyester yarn that has good heat setting properties and dyeability.

The present invention will be explained below with reference to Examples.

Example 1 Using a device as shown in Figure 1, polyester multifilament drawn yarn (75 denier, 36 filaments) was used as the core yarn, and birefringence Δ was used as the wound yarn.
A polyester multifilament highly oriented undrawn yarn (160 denier, 36 filaments) having a polyester fiber density of n (27×10 ^-3 ) was used and false twisting was performed under the following conditions.

(1) False twisting spindle rotation speed 210000 revolutions/min (2) Number of twists 2900T/M (3) Heating plate temperature 218℃ (4) F ¹ 22% F ² 1.0% However, F ¹ = {(Supply roller 6 peripheral speed/
Circumferential speed of supply roller 5)-1}×100(%) F ² = {(Cirferential speed of take-up roller 12/
Peripheral speed of supply roller 5) - 1} x 100 (%) As a result, the winding yarn is tightly wound around the core yarn, and the left and right twist directions are alternately changed periodically as shown in Fig. 4. A non-bulky composite crimped yarn was obtained.
Furthermore, when this yarn was knitted, the wound yarn did not sag or shift at all due to straining in the yarn path, and could be used as a constituent yarn of a knitted fabric while maintaining its appearance at the yarn stage, making the knitted fabric ideal as a summer material. It was a new item that had never existed before and had a "smooth feel" similar to the texture of highly twisted yarn. In addition, the obtained knitted fabric was dyed deeply, making it highly valuable commercially.

Example 2 As in Example 1, ^F1 was changed to 75% and false twisting was performed under all other conditions. As a result, the wound yarn was tightly wound around the core yarn, and the knots were periodically twisted. A non-bulky knotted yarn as shown in FIG. 5 was obtained in which the knotted portion and the non-knotted portion had different left and right twisting directions.

Number of knots per meter of yarn length: 59 Ratio of apparent diameter between knots and non-knotted portions: 1.4 times The knotted yarn portions were mainly triple-wound with highly oriented undrawn polyester yarn. Moreover, this yarn was also a strong covering structure yarn that could withstand the straining during knitting and weaving, and could be used as a design yarn.

Example 3 Using the same equipment as in Example 1, polyester multifilament drawn yarn (150 denier, 36 filaments) was used as the core yarn, and birefringence 27 was used as the winding yarn.
×10 ^-3 polyester multifilament highly oriented undrawn yarn (300 denier, 48 filaments)
The yarn obtained by false twisting using the following conditions was dyed with a disperse dye at 130°C for 60 minutes.

(1) False twisting spindle rotation speed 136000 revolutions/min (2) Number of twists 1900T/M (3) Heating plate temperature 222℃ (4) F ¹ 30% F ² 0% (Definitions of F ¹ and F ² are based on implementation) (Same as Example 1) The obtained yarn has the same characteristics as the yarn obtained in Example 1, and because the dyeing difference between the core yarn and the wound yarn is greatly different, the yarn is intermittently dyed along the longitudinal direction of the yarn. The yarn had an interesting color tone that was different from so-called dye spots that caused differences in brightness.

By appropriately selecting the supplied yarn and processing conditions, it is also possible to obtain a yarn rich in elegance that is unprecedented in color tone.

Comparative Example 1 In Example 1, birefringence Δn was used as the wound yarn.
The experiment was conducted under the same conditions except that polyester multifilament highly oriented undrawn yarn (67 denier, 12 filaments) (25×10 ^-3 ) was used.
As a result, the covering property of the covered yarn was inferior to that of the composite false-twisted crimped yarn of Example 1, and the lightly dyed portion of the drawn yarn of the core yarn was conspicuous and did not result in a good yarn.

Comparative Example 2 An experiment was conducted under the conditions of Example 1 using a drawn polyester yarn (75 denier, 24 filaments) as the core yarn and a drawn polyester yarn (100 denier, 50 filaments) as the sheath yarn.

However, the covering strength of the sheath yarn is extremely poor.
It was not possible to obtain anything that could withstand the weaving and weaving process.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the processing process of one embodiment of the present invention,
Figure 2 is an enlarged view of the main parts of the method according to Figure 1;
The figure is an explanatory graph showing the relationship between the birefringence of undrawn polyester yarn and the main processing conditions that makes it possible to obtain the effects of the present invention. Figures 4 and 5 are explanatory diagrams of the form of the composite crimped yarn according to the present invention. It is. 1: Stretched yarn, 2: Highly oriented undrawn yarn, 3, 4: Wire guide, 5, 6: Yarn feeding roller, 7, 8,
9: thread guide, 10: heating plate, 11: false twist spindle, 12: take-up roller, 13: wind-up package.

Claims (1)

[Scope of Claims] 1. A composite false twisted crimped yarn consisting of a drawn thermoplastic synthetic fiber yarn and a highly oriented undrawn polyester yarn, wherein: (a) the drawn thermoplastic synthetic fiber yarn is a core yarn, and the drawn thermoplastic synthetic fiber yarn is a highly oriented undrawn polyester yarn; has a core-sheath structure in which the sheath yarns are sheath yarns, (b) the sheath yarns have a thicker fineness than the core yarns, and (c) the sheath yarns are twisted around the core yarns by periodically changing the left and right twisting direction. Composite false-twisted crimped yarn characterized by being twisted.