JPS6360138B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a special composite yarn having S-twist portions and Z-twist portions alternately along the longitudinal direction of the yarn, and more specifically to a composite yarn consisting of two or more yarns with different crimp waveforms. A special composite processed yarn having S twist portions and Z twist portions having substantially equal apparent bulkiness alternately along the longitudinal direction of the composite yarn, and a portion of the yarn forming a loop. It is related to. Conventionally, in the false twisting process, the method of obtaining untwisted yarn is to use a constantly rotating spindle to wind the sheath yarn around the core yarn at a high overfeed rate, heat set it, and then untwist it. , S/Z alternating twisting of high elongation yarns in the core yarn, or by applying constant false twisting to two yarns with different elongation at the same time. How to wrap it with
Alternatively, there is a method of obtaining an untwisted yarn with alternating S and Z directions by performing steady false twisting at a high overfeed rate of 10% or more. However, in these untwisted yarns, the untwisted part with twist in the direction of false twisting is narrowly converged, and the overtwisted part with twist in the opposite direction is large and bulges, and furthermore, the untwisted part with the twist in the direction of false twisting is large and the The length of the untwisted part is only on the order of a few millimeters to a few centimeters, and because of this, when it is made into a fabric, the details can be seen through due to the short thickness irregularities, resulting in unusual irregular appearance irregularities. The disadvantage is that the surface of the fabric becomes dirty. In addition, in the false twisting process, by performing active unsteady false twisting operations such as intermittent driving of the false twisting spindle, variable speed driving of the feed roller, and displacement of the false twisting zone yarn path, it is possible to create an S-twist part in the longitudinal direction of the yarn. As a technique for forming Z-twisted parts alternately,
Publication No. 12891, Special Publication No. 14615, Publication No. 14615, Special Publication No. 14615, Special Publication No. 14615
-8414 Publication, JP-A-49-108353, JP-A-Sho
51-49949, Japanese Patent Application Laid-Open No. 53-61745, etc., yarns obtained simply by subjecting a thermoplastic synthetic fiber multifilament to unsteady false twisting as described in these documents. When the untwisted part with the twist in the false-twisting direction does not have bulk like the over-untwisted part with the twist in the false-twisting/untwisting direction, and such a thread is made into a fabric. However, due to the difference in bulkiness, there are defects-like appearance irregularities due to a lack of thickness locally, and a high-quality product feeling cannot be obtained. On the other hand, in order to obtain a spun-like processed yarn, a method of applying so-called taslan processing, in which a fluid is injected to a filament yarn to form a loop, is used. However, since the loops formed by Taslan processing have a unique teardrop shape, the fabrics made from this processed yarn have a rough texture and have a spun-like feel, but are so-called cotton-like. When the fabrics are tied together, the teardrop-shaped loops become entangled with each other and become difficult to separate, causing a so-called fastener phenomenon. In order to solve the above-mentioned drawbacks, the present inventors applied an unsteady false twisting process to the bulky textured yarn of thermoplastic synthetic fiber multifilament, thereby increasing the apparent bulk of the untwisted portions and over-untwisted portions. In a patent application filed on February 9, 1981, we have already proposed a technology to make the yarns substantially equal.Although the bulkiness of the untwisted part and the overtwisted part of the yarn obtained by the above process are the same, the bulkiness may vary depending on the application. However, the yarn did not have sufficient bulkiness, and moreover, it merely exhibited a strongly twisted tone, resulting in a yarn with little change in appearance. The present invention has been made in view of the above-mentioned points, and its purpose is to have the bulkiness of the untwisted part and the overtwisted part substantially equal, and that the bulkiness is extremely large. The purpose of the present invention is to provide a special composite processed yarn that exhibits a spun-like, wool-like appearance and texture and does not cause the fastener phenomenon. It is a composite yarn in which a crimped yarn A consisting of a multifilament is used as a core yarn, and a yarn B having a crimped waveform different from that of the yarn A is wound around the core yarn, and the yarn B is wound along the longitudinal direction of the composite yarn. It has a structure in which S-twist portions and Z-twist portions are alternately formed so that the apparent bulkiness is substantially equal, and a portion of yarn B forms an arch-shaped loop. The present invention will be explained in detail below based on the accompanying drawings. Figure 1 shows an example of the special composite processed yarn of the present invention.
A crimped yarn A made of a thermoplastic synthetic fiber multifilament is used as a core yarn, and a yarn B has a crimped waveform different from that of the yarn A, that is, the crimp amplitude, wavelength (period), etc. are different from the yarn A. The yarn B is wound around the yarn A while randomly changing the winding density in the longitudinal direction, and a part of the yarn B has a coarse winding density and forms an arch-shaped loop 1. Further, along the longitudinal direction of the yarn, at least the yarn A alternately has an S-twist portion 2 having an S twist and a Z-twist portion 3 having a Z twist;
From the twisting part 2 to the Z twisting part 3 and from the Z twisting part 3 to the S
Between the twisted part 2 and the length of the S twisted part 2 and the Z twisted part 3, non-twisted parts 4 and 5 are formed with lengths that are negligible compared to the lengths of the S twisted part 2 and the Z twisted part 3. Moreover, inside the S twist part 2 and the Z twist part 3
Although there are minute irregularities due to changes in the winding density of the yarn B, there is no substantial difference in apparent bulkiness (thickness) between the S-twisted part 2 and the Z-twisted part 3. , the yarn is uniformly bulky along the longitudinal direction. In addition, bulkiness here means the degree of bulkiness based on the apparent outer diameter of the yarn, and substantially the same bulkiness means the difference in the apparent outer diameter of the yarn under slight tension close to no tension. is 10% or less, preferably 5% or less, based on either the S-twist portion or the Z-twist portion, whichever is thicker. As mentioned above, the special composite processed yarn of the present invention has S twist portions and Z twist portions alternately along the longitudinal direction of the yarn, so it has a fine silky feel, drapability, weight, and elastic texture. Moreover, since the crimped waveforms of yarn A and yarn B that make up the composite textured yarn are different, the decrease in bulkiness due to alternating twisting is lower than that of crimped yarns with the same waveform. Therefore, the bulkiness of the S-twisted part and the Z-twisted part are not only substantially equal, but also extremely large, and the bulkiness of the It also has a large bulkiness, so when this yarn is made into a fabric, it does not exhibit defects-like appearance spots where the thickness is lacking locally, and it has an extremely bulky feel as a whole. A fabric with a rich soft feel can be obtained. In addition, since the yarn B that winds the yarn A forms an arch-shaped loop in the part where the winding density is coarse,
Loops of crimped yarn are scattered in the longitudinal direction of the yarn, and the large bulkiness and scattered arch-shaped loops make it smooth to the touch, giving the fabric a wool-like slimy feel. It can give a spun-like, wool-like appearance and texture. Furthermore, even the existence of a loop does not cause the so-called Fassner phenomenon. Next, an example of the method for producing the yarn of the present invention will be explained with reference to FIG. First, the thermoplastic synthetic fiber multifilament yarn A is passed through the feed roller 6 to the first heater 7.
and a spindle 8, and a feed roller 9 overfeeds the yarn B, which is the same type or different type as the yarn A, to the same false twisting zone as the yarn A, and performs a steady false twisting process. The yarn A and the yarn B are crimped with different waveforms, and at the same time, the yarn A is used as the core yarn and the yarn B is wound alternately in the S and Z directions to form a false twisted crimped yarn. Next, the first delivery roller 10
The false-twisted crimped yarn pulled out from the false-twisting zone is passed through a second heater 11 and a false-twisting nozzle (hereinafter referred to as nozzle) 12.
By passing the yarn through an unsteady false twisting zone consisting of The strands are wound with short alternating twists on the order of a meter, are unraveled by swirling force when fluid is supplied, or by propagation twist when fluid is stopped, and then the yarn is twisted by several tens of centimeters using the transient phenomenon of false twisting due to unsteady false twisting. Convert to alternating twists with lengths on the order of meters. In this case, when the fluid is first supplied to the nozzle 12, the twists twisted in the twisting zone before passing through the nozzle 12 are thermally fixed by the second heater 11, and then when the fluid supply is stopped, the twists are heated in the twisting zone. The fixed twist passes through the untwisting zone after passing through the nozzle 12 without being subjected to an untwisting action, and the untwisted portion having a twist in the S or Z direction is pulled out from the second delivery roller 13. For example, when the yarn is turned in the S direction by a fluid, the Z twist of the S and Z winding twists is untwisted, and all of them suddenly turn into an S twisted state, and then the over-untwisted state occurs in the untwisting zone. The yarn is twisted to form a Z-twisted portion, but the untwisted Z-twist becomes a difference in yarn length and an arch-shaped loop is formed. Then,
When the fluid is stopped, the S/Z winding twist is untwisted by the propagation of the S twist, which is the twisting when the fluid is supplied, to form an S twist section. An arch-shaped loop is formed by the yarn length difference due to the untwisting of the Z twist. In the case of unsteady false twisting, when the fluid stops, the twisting of the yarn passing through the untwisting zone decreases, but when the fluid supply is restarted, a sudden untwisting action occurs in the untwisting zone. As a result, the over-twisted part with twist in the Z or S direction is pulled out, and the untwisted part is pulled out in the section from the untwisted part to the over-untwisted part and the section from the over-untwisted part to the untwisted part. Pulled out package 14
It is rolled up. As mentioned above, when the fluid stops, the untwisted part is pulled out, and when the fluid is supplied, the overtwisted part is pulled out, but the yarn supplied to the unsteady false twist zone is a yarn with crimped yarn A as the core yarn. Since the yarn B has a wound structure with a crimped waveform different from the yarn A, it is of course possible to use ordinary raw yarn whose constituent single yarns are almost parallel as the supplied yarn.
Even if a crimped yarn with the same crimped waveform is used as the supplied yarn, the difference in the crimped waveforms between yarns A and B causes the filling condition to be looser when alternate twisting is applied, resulting in increased bulk due to alternate twisting. There is little decline in sex. Additionally, in general, the untwisted part, which is pulled out while the twist applied before passing through the nozzle remains heat-fixed, is rapidly subjected to the untwisting action of the nozzle after passing through the nozzle, which is opposite to the twisting direction. Although the bulkiness is poor compared to the over-untwisted part that is formed by untwisting the untwisted part, as mentioned above, the filling condition when applying alternate twisting is loose and even the ununtwisted part has a close-packed structure. Therefore, bulkiness substantially equivalent to that of the over-twisted portion is maintained. An example of the method for manufacturing the special composite processed yarn of the present invention has been described above, but as the yarn A to be supplied in the present invention, thermoplastic synthetic fiber multifilament such as polyester or polyamide can be used. Yarn B may be a thermoplastic synthetic fiber multifilament of the same type or different type as yarn A, with the same physical properties such as fineness, elongation, heat shrinkage rate, birefringence, etc., or yarns with different physical properties such as rayon, acetate, etc. You can use yarn of
Furthermore, two or more yarns may be combined as yarns A and/or B. In addition, in order to give different crimp waveforms to yarns A and B and at the same time to wind yarn B in S and Z shapes using yarn A as a core yarn, it is necessary to It is necessary to overfeed yarn A by 5% or more, preferably by 10% or more; if the overfeed is less than 5%, the crimp waveform difference between yarns A and B will be too small and the effects of the present invention will not be obtained. On the other hand, if the oversupply of yarn B is too large, the yarn B will become a sloppy yarn in which the yarn B is wound in a triple structure around the yarn A, and the fabric using this yarn will have a hard texture and a gaudy appearance. So,
It is preferable to set the excessive supply of yarn B within a range that does not form a triple structure. In overfeeding yarn B over yarn A during steady false twisting, as shown in Figure 2, the tension is increased by overfeeding yarn B with a feed roller whose surface speed is higher than that of the feed roller for feeding yarn A. Using the adjustment device, the feeding tension of yarn B is lower than that of yarn A, and yarn B has a higher residual elongation than yarn A.
For example, it is possible to use means such as supplying a highly oriented undrawn yarn in alignment with the yarn A, thereby substantially overfeeding the yarn B. In addition, the false-twisting bodies used in steady false-twisting and unsteady false-twisting processes include the above-mentioned false-twisting nozzle using compressed fluid and spindle-type twisting bodies driven by belts, as well as friction-type twisting bodies. A twisted body, an air spindle type twisted body, etc. can be used. Furthermore, methods for performing unsteady false twisting include a method of intermittent twisting in the S or Z direction with a false twisting body, a method of intermittent twisting alternately and in the S and Z directions, and a method of intermittent twisting in the S and Z directions. A method of twisting the yarn continuously and continuously, a method of variable speed driving of a feed roller, a method of varying the yarn path in the false twisting zone, etc. can be adopted. Note that the steady false twisting process and the subsequent unsteady false twisting process may be performed continuously or discontinuously, and the twisting directions may be the same or different. Hereinafter, the present invention will be specifically explained with reference to Examples. Example 1 Polyester filament as yarn A
100d/48f, polyester filament 50d/48f was used as the yarn B, and in the process shown in Figure 2, a steady false twisting process using a spindle and an unsteady false twisting process in which unidirectional intermittent twisting was performed using a nozzle were successively performed. conduct,
A special composite processed yarn in which crimped yarn B is wound around crimped yarn A, and S-twist portions and Z-twist portions alternate in the longitudinal direction, and a portion of yarn B forms an arch-shaped loop. I got it. Table 1 shows the processing conditions.

【table】

[Table] The obtained yarn has an untwisted part (Z
Twisted part) is around 0.7m, over-twisted part (S-twisted part) is 0.8m
Both exist alternately in the front and rear lengths, and the non-twisted parts between the untwisted part and the over-untwisted part and between the over-untwisted part and the untwisted part are only traces and can be ignored. It was hot. Table 2 shows the results of measuring the yarn outer diameters of the untwisted portion and the excessively untwisted portion using a microscope while applying a tension of 2 mg/d to the yarn, along with the comparative examples below. Comparative Example 1 is a yarn obtained by performing the same operation as in Example 1, except that yarns A and B were aligned at an overfeed rate of 2% and subjected to constant false twisting. Moreover, Comparative Example 2 is a yarn obtained by winding up the yarn on a winding roller immediately after the steady false twisting process using the spindle in Example 1.

[Table] As is clear from Table 2, the yarn of Example 1 has almost no difference in the measured outer diameter between the untwisted part and the over-twisted part, and is uniformly bulky. Even when the outer diameter was corrected to the same fineness in consideration of the difference in fineness as in Comparative Example 1, in which both the over-twisted portion and the yarn had the same crimped waveform, the bulkiness was 1.3 times or more, which was significantly higher. Further, the yarn of Comparative Example 2 had a large difference in the measured diameter between the partially untwisted part and the overly untwisted part, and had large thickness unevenness. Using the yarn of Example 1, the warp density was 75/2.54
The plain weave fabric with a weft density of 68 threads/2.54 cm has a texture similar to strongly twisted yarn, and also has sink-like defect-like appearance spots due to the thin outer diameter of the yarn in the untwisted part.
It had uniform bulkiness without any thinness or defects, and had a spun-like appearance and texture. In addition, to measure the yarn outer diameter, the yarn in the part corresponding to the untwisted part or the over-untwisted part was collected on a microscopic measurement preparation under a tension of 2 mg/d, and the part was separated from the center of the sample by 20 mm in front and back. Directly read the thread outer diameter of
The average value was taken as the thread outer diameter.

[Brief explanation of the drawing]

Fig. 1 is an external view of one embodiment of the special composite processed yarn of the present invention, and Fig. 2 is a schematic manufacturing process diagram of the same, in which A and B are crimped yarns, 1 is a loop, and 2 is an S twist. Parts 3 and 3 are Z-twisted parts, and 4 and 5 are non-twisted parts.

Claims (1)

[Claims] 1 A crimped yarn A made of thermoplastic synthetic fiber multifilament is used as a core yarn, and the yarn A is attached to this core yarn.
A composite yarn wound with a yarn B having a crimp waveform different from that of the composite yarn, which alternately has S-twist portions and Z-twist portions having substantially equal apparent bulkiness along the longitudinal direction of the composite yarn. , and a part of yarn B forms an arch-shaped loop.