JPS5891839A - Composite false twisted crimp yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, we have created variable yarns and slub yarns in which wound yarns are alternately wound around a core yarn so that the left and right twist directions are different. The following manufacturing methods have been proposed. If all of these things are left as they are, the winding yarn may become walnut or shift due to ironing during the thread path during winding and 1st knitting in the 2nd knitting preparation process, as well as during the weaving preparation process and passing through the reed during weaving. There have been 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 crispness, and aesthetic dyeability.

Such a conventional example, as disclosed in Japanese Patent Publication No. 47-49459, uses a drawn yarn as the winding yarn, so that the above-mentioned drawbacks have not been improved. Also, as an example of a prior application, the patent application
No. 753 exists, but the yarn feeding method is different and there are still problems.

Therefore, the present inventors found that the wound yarn had extremely excellent heat setting properties. However, it is believed that the above-mentioned drawbacks can be improved by using yarns that do not easily fuse together, such as undrawn yarns, even when subjected to normal false twisting.

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 forming walnuts or easily shifting due to ironing in post-processing as in the conventional method, to provide good covering properties of the wound yarn, and to ensure that the wound yarn has good covering properties. 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.

"In a composite false twisted crimped yarn consisting of a drawn thermoplastic synthetic fiber yarn and a highly oriented undrawn polyester yarn.

B. It has a core-sheath structure in which the drawn thermoplastic synthetic fiber yarn is the core yarn and the highly oriented undrawn polyester yarn is the sheath yarn.

The fineness of the mouth and sheath threads is thicker than that of the core thread.

Ha. A composite false-twisted crimped yarn characterized in that sheath yarns are twisted around a core yarn by periodically changing the left and right twisting directions. −].

What is the thermoplastic synthetic fiber drawn yarn in the present invention?

It refers to a drawn yarn such as polyester, nylon 61, nylon 66, etc., which is normally used as a feed yarn for false twisting.

In addition, highly oriented undrawn polyester yarn refers to one with a much lower degree of orientation than the drawn thermoplastic synthetic fiber yarn, and the undrawn polyester yarn with a birefringence of 15 to 60 x 10-' spun at high speed is actively spun. refers to a material that has been false twisted without being stretched. In other words, as raw yarn, the conventional 1500m
It is a highly oriented undrawn yarn that is obtained by increasing the spinning speed and spinning it all at once instead of using the normal undrawn polyester yarn obtained at a spinning speed of less than 1 min. phenomenon, and the elongation is at least 80
% or more and has extremely excellent heat setting properties.

Furthermore, highly oriented undrawn polyester yarn is used which does not easily fuse on a hot plate under normal false twisting conditions. That is, usually polyester undrawn yarn (birefringence 5 to 1
0x10-3) is completely unqualified, so that fusion occurs instantaneously on the heating plate under normal false twisting conditions.9On the contrary, highly oriented undrawn yarn with birefringence exceeding 60 x 10'' teeth,
The fibers exhibit physical behavior similar to that of ordinary drawn yarns, and the desired effects 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 crisp texture. Furthermore, such a two-layer structured yarn also has the appearance of a designed yarn, and has features and characteristics 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 coating 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 different.
This is also because the yarn shape retention effect is also improved. Furthermore, the appearance after dyeing is improved, and the texture is also preferable.

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 2-twist are twisted periodically, the sheath yarn is tightly and tightly arranged around the core yarn, and a yarn with the texture and structure of a non-bulky, strongly twisted yarn is obtained. In this case, the sheath thread may be single-layered or double-layered.

It may be wrapped in 6-3 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 coating, and the coating is fairly uniform.

In the yarn shown in FIG. 5, double winding and triple winding are formed locally, and changes occur in the length direction of the yarn.

However, the threads in Figure 4 are similar to the fabric with little change.
The yarn shown in the figure is useful as a decorative yarn with variations.

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, a drawn yarn 1 that will eventually become a core yarn passes through a wire guide 3, is fed by a yarn feeding roller 5 through a thread guide 7, and is supplied to a thread guide 9; The highly oriented undrawn polyester yarn 2 passes through a wire guide 4,
The thread is fed by the yarn feeding roller 6 at an angle θ to the traveling direction of the drawn yarn 1 as shown in FIG. This brings us to Guide 9. 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 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 a single yarn. Next, the twisted form in the heating area is set by heat on 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 false twisting 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 it is always the case that drawn yarn 1 > polyester highly oriented undrawn yarn 2
In order to make the yarn feeding tension relationship possible, ((supply amount of highly oriented undrawn yarn/supply amount of drawn yarn)-1)xloo(
(hereinafter referred to as F1) is limited as follows. Figure 6 shows the birefringence of highly oriented undrawn polyester yarn and the F
As shown in the possible range of obtaining the effects of the present invention limited by 1, Fl changes depending on the highly oriented undrawn polyester yarn having different birefringence, ((birefringence of highly oriented undrawn polyester yarn) Must be above.

In Figure 3, the value of birefringence on the horizontal axis is 35 x 10-
The reason why F1≦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.

Even if the tension is low, it is easily stretched and the tension decreases.

Therefore, in this region, the tension relationship of the present invention, ie, the relationship of drawn yarn>highly oriented polyester undrawn yarn holds true. The highly oriented undrawn polyester yarn in the area where it curls will retain its high polyester content even if it is slightly stretched.

Since it is a knitting of oriented undrawn yarns, it is possible to exhibit the performance that meets the objectives of the present invention. Furthermore, Fig. 3 horizontal axis birefringence 33
The reason why the lower limit line of Fl exceeds 0 in the range exceeding x 10 is that in this range, the highly oriented undrawn polyester yarn becomes difficult to stretch, and the relationship between the core and sheath is reversed due to slight tension fluctuations. This is because the tension relationship cannot be maintained within the scope of the present invention.

The upper limit of μ is an explanation of the lower limit line of Fl.

In this way, the drawn yarn satisfies the limited range of Fl.

Highly oriented undrawn polyester yarn is supplied, but the reason why the wound yarn is finally 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, and the tension decreases at the same time.

The twist starting point P moves its position in the opposite direction.

10- In this way, the twisting starting point P continuously and freely changes its position along the longitudinal direction of the yarn.

The winding density of highly oriented undrawn polyester yarn changes periodically from high density to low density, and highly oriented undrawn polyester yarn has extremely excellent heat setting properties on a heating plate.
In that state, the shape is very firmly fixed. Therefore, during untwisting, the part with high winding density remains untwisted and tightly wound in the heating direction, while the part with low winding density retains its heat-set coil-like form and is over-unraveled. The twisted yarn becomes well wound around the core yarn, and has the appearance shown in Fig. 4.The wound yarn has an appearance as shown in Fig. 4. A composite crimped yarn having a texture similar to that of a non-bulky highly twisted yarn is obtained.

However, compared to the drawn yarn, the polyester highly oriented undrawn yarn is larger in the overfeed direction, that is, Fl is larger ((5/13) x (birefringence of the polyester highly oriented undrawn yarn) xlo -1- 45) With the above setting, the supply tension of the highly oriented undrawn polyester yarn is always zero tension, all the heating tension is applied to the drawn yarn, and the twisting start point P tries to obtain a stable position in the running direction of the yarn. In this case, the highly oriented undrawn yarn is supplied to the drawn yarn in an extremely overfeed amount, and even if the highly oriented undrawn yarn completely destroys the periphery of the drawn yarn by single winding, it still remains relaxed. In the case of polyester fibers, multiple winding such as double or six winding occurs locally near the thread guide to reduce loosening and continue winding, but highly oriented undrawn polyester yarn is continuously fed with a constant feed Because it is supplied in large amounts, localized multiple windings as shown in Figure 2 are periodically generated. The winding tension of the highly oriented undrawn polyester yarn in this local multiple winding area is extremely low, so when it is placed on the heating plate, it heat-shrinks in a free state, 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 that are twisted many times in the heating direction. In addition, the part without multiple windings retains the heat-set coil-like form, and the above-mentioned Fl is ((5/13)x
(Birefringence of highly oriented undrawn polyester yarn) xlo +
45) As in the case below, especially in this case, since the part that becomes one knot is hardly untwisted, it is more over-untwisted to form a non-knot part that is wrapped well around the core yarn. As described above, the winding yarn as shown in Fig. 5 is tightly wound around the core yarn, has knots at nine periodic intervals, and has a non-bulky yarn in which the twisting direction of the knots and non-knots is changed alternately on the left and right. 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.
Next, the yarn is passed through a heating zone to be heat set, and then passed through a false twisting machine to be wound up. Even if the relationship between quantities is limited to the shaded area in FIG.

Highly oriented undrawn polyester yarn is easily drawn and is slightly drawn. However, what is the degree of stretching?

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 in the range of 135 to 15013-×10. The birefringence Δn of the highly oriented undrawn polyester yarn portion of the invented yarn is 120x at maximum.
10-5 or less, and most of them are 110×104 or less. Therefore, the dyeability of this part is good and it also has a hard texture. In addition to the above-mentioned manufacturing method, if the conditions are met, a simple alignment false twisting method may be used.

The composite crimped yarn of the present invention can be made into a knitted fabric without losing its appearance and texture during 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 crisp 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 and dyeability.

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

Example 1 Using an apparatus as shown in FIG.
A polyester multifilament highly oriented undrawn yarn (160 denier, 6 filament) having a diameter of 27 x 10 -5 was used and false twisting was performed under the following conditions.

(1) False twisting spindle rotation speed 210,000 revolutions/min (2) Heating number 2900 T/M (3)
Heating plate temperature 218℃ (41F'
22 ChiF21.0% However.

F1=((peripheral speed of supply roller 6/peripheral speed of supply roller 5)
-1) A non-bulky composite crimped yarn as shown in FIG. 4 was obtained by winding the yarn by periodically changing the left and right twist directions. Furthermore, when this yarn was knitted, the wound yarn did not form any walnuts or shift due to straining in the yarn path, and could be used as a constituent yarn of a knitted fabric while maintaining the appearance of the yarn stage, making silk fabric ideal as a summer material. It was a novel item that had never existed before, with a "sharp feel" similar to the texture of highly twisted yarn. Furthermore, the obtained knitted fabric was dyed to be deeply dyed, 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 had two periodic knots. A non-bulky knotted yarn as shown in Fig. 5 was obtained in which the left and right twisting directions of the knotted portion and the non-knotted portion were changed.

The number of cylinders per meter of yarn length was 59 and the apparent diameter ratio of the non-knotted portion was 1.4 times.The knotted yarn portion was mainly triple-wound with highly oriented undrawn polyester yarn. Moreover, this yarn was also a strong coated 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 !+6 filament) was used as the core yarn, and birefringence 27 x 10- was used as the winding yarn.
' Polyester multifilament highly oriented undrawn yarn (300 denier, 48 filaments) was false-twisted under the following conditions.
Staining was carried out at 0°C for 60 minutes.

(1) False-twisting spindle rotation speed 136,000 revolutions/min (2) Heating number 1900 T/M (3)
Heating plate temperature 222℃f4)F”
! 10%F2
0chi (definitions of F' and F2 are the same as in Example 1) The obtained yarn has the same characteristics as the yarn obtained in Example 1, and the dyeing difference between the core yarn and the wound yarn is significantly different. As a result, the yarn had an interesting color tone, which was different from the so-called beam floor, which had intermittent differences in brightness along the length of the yarn.

In this way, by appropriately selecting the supply system and processing conditions, it is possible to obtain a yarn rich in elegance that is unprecedented in color tone.

Comparative Example 1 In Example 1, the wound yarn had birefringence Δn (25xl
The experiment was conducted under the same conditions except that a highly oriented undrawn polyester multifilament yarn (67 denier, 12 filaments) with a polyester multifilament structure (67 denier, 12 filaments) was used. As a result, compared to the composite false twisted crimped yarn of Example 1, The covering properties of the coated yarn were poor, and the lightly dyed portions of the drawn yarn of the core yarn were noticeable and did not result in a good yarn.

Comparative Example 2 Under the conditions of Example 1, polyester drawn yarn (
(75 denier, 24 filaments) and a polyester drawn yarn (100 denier, 50 filaments) as the sheath yarn.

However, the covering strength of the sheath yarn is extremely poor.

Nothing that could withstand the weaving and weaving process could be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the processing steps of one embodiment of the present invention. FIG. 2 is an enlarged view of the main parts of the method shown in FIG. 1, and FIG. 3 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.
FIGS. 4 and 5 are explanatory diagrams of the form of the composite crimped yarn according to the present invention. 1: Drawn yarn 2: Highly oriented undrawn yarn 3.4: Wire guide 5.6: Yarn feeding rollers 7, 8.9 Varnished guide 10: Heating plate 11: False twist spindle 12: Take-up roller 16: Winding package Patent applicant Toshi Co., Ltd. 19-Yo1 Figure

Claims (1)

[Claims] A. It has a core-sheath structure in which the drawn thermoplastic synthetic fiber yarn is the core yarn and the highly oriented undrawn polyester yarn is the sheath yarn. mouth. The fineness of the sheath yarn is thicker than that of the core yarn. Ha. A composite false-twisted crimped yarn characterized in that sheath yarns are twisted around a core yarn by periodically changing the left and right twisting directions.