JPH0849129A - Special conjugated finished yarn and its production method - Google Patents

Abstract

PURPOSE:To provide a method for producing a special conjugated finished yarn without having any interlacing between a core yarn and a sheath yarn, having a loop fluff and the feeling of a natural fiber like unevenness without having a discrepancy between the core and sheath yarns, suitable for a spun-like feeling clothing material. CONSTITUTION:This method for producing a special conjugated finished yarn comprises paralleling a high melting high stretch type multifilament yarn A consisting of a polyester highly oriented unstretch yarn and a low melting low stretch type multifilament yarn B having a lower melting point than that of the yarn A by 20 deg.C consisting of a nylon 6 stretch yarn, a modified polyesterbased conjugated fiber yarn, etc., and feeding the paralleled yarn into a false twister, treating the yarn with a false twisting process at a temperature capable of melting the yarn B but not the yarn A, then treating the resultant yarn with a false twisting process intermittently at a temperature not melting the yarn B through a twisting nozzle, and obtaining a double layered special conjugated finished yarn having a united structure of the yarn A as the sheath and the yarn B as the core with an alternated twist consisting of S twist and Z twist having >=500mm length, no interlacing between the both yarns A, B each other with only the yarn B being melted, the loop fluff existing on the surface of the yarn and zero degree discrepancy of the yarn A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spun-like special yarn which does not cause entanglement between two yarns constituting a composite yarn, and has fine loop fluffs, and is unlikely to be displaced between yarns. The present invention relates to a composite textured yarn and a manufacturing method thereof.

[0002]

2. Description of the Related Art A composite processed yarn having a core-sheath structure, which has a spun-like appearance and is less likely to cause misalignment between yarns, and a method for producing the same have been proposed, for example, in Japanese Examined Patent Publication No. 3-20496. In this method, a polyester stretched yarn and a polyester highly oriented unstretched yarn are combined, and a false twisting and twisting operation is performed intermittently at a temperature at which they melt to form an untwisted and bundled portion in the longitudinal direction of the yarn. Alternately forming the over-twisting and focusing parts,
The threads are melted and adhered to each other. However, in the above-described composite processed yarn, the polyester drawn yarn that constitutes the core yarn and the polyester highly oriented undrawn yarn that constitutes the sheath yarn both melt and bond together, resulting in a hard texture and a poor hand feeling. was there.

Further, Japanese Examined Patent Publication No. 48-9226 discloses that two or more kinds of thermoplastic synthetic fiber filament yarns having different fusion temperatures are obtained by false twisting at a temperature at which only one yarn is fused. Fused fusion crimped yarns are described. In this fusion-crimped yarn, the core yarn is fused, the sheath yarn has crimps, and has alternate twists of S twist and Z twist. Since it was obtained, the length of both the S twisted portion and the Z twisted portion was at most about 10 mm, and therefore the twists in the opposite directions of the S twisted portion and the Z twisted portion were easily canceled out. was there. Also, in this fusion-crimped yarn, the core yarn and the sheath yarn are integrated due to the fusion of the core yarn, but the joining force is weak, and if it is supplied to the weaving and weaving process as it is, misalignment occurs and the quality is deteriorated. Only fabrics with poor quality can be obtained.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, has a span-like texture and a natural unevenness like natural fiber, and has a yarn between the core yarn and the sheath yarn. It is a technical subject to provide a special composite textured yarn in which a line deviation is unlikely to occur and a manufacturing method thereof.

[0005]

In order to solve the above problems, the present invention has the following constitution. (1) A two-layer structure yarn in which a core yarn and a sheath yarn are integrated by alternate twists of S twist and Z twist having an average length of 500 mm or more, and the core yarn and the sheath yarn are not entangled but only the core yarn. Melts down,
A special composite processed yarn characterized in that there are loop fluffs on the surface of the yarn and the degree of deviation of the sheath yarn is zero. (2) High melting point, high elongation thermoplastic multifilament yarn,
The low-melting point, low-elongation thermoplastic multifilament yarn, which has a melting point of 20 ° C. or more lower than that of the multi-filament yarn, is aligned to melt the low-melting point, low-elongation multifilament yarn, and the high-melting point, high-elongation multifilament yarn. Manufacture of a special composite textured yarn characterized by performing false twisting at a temperature at which the filament yarn does not melt, and then intermittently performing false twisting at a temperature at which the low melting point, low elongation thermoplastic multifilament yarn does not melt Method.

The present invention will be described in detail below.

FIG. 1 is a schematic external view showing an embodiment of the special composite textured yarn of the present invention. As shown in FIG. 1, the special composite processed yarn of the present invention has a core yarn A and a sheath yarn B which are alternately twisted in S and Z in the longitudinal direction of the yarn (Z twist portion a = untwisted bundle portion and S twist portion). Part B = over-untwisted converging part), the untwisted part C and ununtwisted converging part There is a crimped portion D between the over-twisted and focused portion B.

In the textured yarn of the present invention, the core yarn and the sheath yarn are not entangled, but only the core yarn is melted and adheres to the sheath yarn. Since the loop fluff 10 mainly having an arch shape is present on the surface of the yarn, it has a span-like texture.

Further, since the core yarn and the sheath yarn are integrated by the alternate twist consisting of S twist and Z twist having an average length of 500 mm or more, the fabric obtained by weaving and knitting has a natural texture like natural fibers. It is possible to impart a certain surface effect.

Further, since the core yarn and the sheath yarn are integrated by both the fusion bonding of the sheath yarn by the fusion of the core yarn and the alternate twisting of S and Z, the deviation degree of the sheath yarn is 0, There is no deviation between the yarn and the sheath yarn. The deviation degree of the sheath thread specified in the present invention is such that the thread is passed through a guide sandwiched between satin washer having a weight of 1.0 D per fineness (D: D) at 50 m / min for 2 minutes, This is the value obtained by counting the number of core yarns and sheath yarns that separated from each other as a result of the passage, and converting the number into 10m.

Further, as the core yarn constituting the special composite textured yarn of the present invention, a composite fiber having a high melting point thermoplastic polymer in the core portion and a low melting point thermoplastic polymer in the sheath portion is used, and the sheath yarn has a high melting point thermoplastic polymer. When multifilament yarn is used, only the sheath part of the core yarn is melted and adheres to the sheath yarn. Therefore, in addition to the spun-like feel imparted by the non-fused sheath yarn and the effect of preventing misalignment between yarns, Since the high melting point thermoplastic polymer, which is the core of the core yarn, maintains high strength, it becomes possible to prevent yarn breakage and elongation due to tension applied during post-processing such as knitting and weaving.

Next, a method for manufacturing the special composite textured yarn of the present invention will be described.

In the present invention, a high melting point, high elongation thermoplastic multifilament yarn and a low melting point, low elongation multifilament yarn having a melting point lower than that of the multifilament yarn by 20 ° C. or more, preferably 40 ° C. or more are supplied. It is necessary to use it as a thread.

If the difference in melting point between the supplied yarns is less than 20 ° C., the sheath yarn is likely to be fused during false twisting at a temperature at which the low melting point yarn is fused, which is not preferable. Further, the greater the difference in the elongation between the two yarns, the more effective it is in forming the core-sheath structure in the false twisting process. Therefore, the elongation of the high melting point multifilament yarn is low. More preferably than the elongation of
It must be 50-100% larger.

As the high melting point, high elongation thermoplastic multifilament yarn, a highly oriented undrawn yarn of polyester such as polyethylene terephthalate is preferably used.

As the low melting point, low elongation thermoplastic multifilament yarn, a highly oriented and highly crystalline nylon highly oriented yarn obtained by a spinning-hot drawing method, a high speed spinning-winding method, or the like, A modified polyester obtained by copolymerizing polyethylene terephthalate with isophthalic acid can be used. The nylon means a polyamide having an amide bond in the molecular chain and includes nylon 6, nylon 6.6, nylon 4.6, and the like.

Further, as the low melting point and low elongation multifilament yarn, polyester having an ester bond in the molecular chain represented by polyethylene terephthalate in the core, and polyester having the low melting point thermoplastic polymer in the sheath can be used. A composite fiber composed of a modified polyester obtained by copolymerizing a third component such as isophthalic acid is preferably used.

In the present invention, the above-mentioned two kinds of multifilament yarns are aligned and supplied to the false twisting area, the low melting point and low elongation multifilament yarns are melted, and the high melting point and high elongation multifilament are obtained. False twisting is continuously performed at a temperature at which the yarn does not melt. By this processing, the high melting point, high elongation multifilament yarn is stretched, the yarn length becomes longer than that of the low melting point, low elongation multifilament yarn, and the core-sheath two-layer structure is formed, and the low melting point, low elongation multifilament Due to the fusion of the yarns, the two yarns are partially bonded in the longitudinal direction. The conditions for false twisting are the number of false twists (25000 to 30000) / D ^1/2
(T / M: D is the sum of the fineness of two yarns: denier), and the overfeed rate is preferably -5 to 5%.

In the yarn after the false twisting, the core yarn and the sheath yarn are integrated due to the fusion of the core yarn, but the joining force is weak, and if it is supplied to the weaving and weaving process as it is, a deviation occurs, Only poor quality fabric can be obtained. Therefore, in the present invention, following the above false twisting process, an intermittent false twisting operation is performed at a temperature at which the low melting point, low elongation multifilament yarn does not melt.
Here, "intermittent false twisting / twisting operation" means intermittent twisting in the S direction or Z direction by a false twisting twisted body, or intermittent or continuous alternating in the S direction and Z direction. It means twisting to.

In the present invention, the false twisting operation is intermittently performed subsequent to the continuous false twisting process as described above.
For example, a case will be described in which compressed air is intermittently supplied to the twisting nozzle to repeatedly turn and stop, and the S and Z alternating twists are imparted by utilizing the transient phenomenon of false twist.

First, when a compressed fluid is supplied to the twisting nozzle, the aligned yarns are twisted in the twisting direction on the upstream side of the twisting nozzle, and then the twisting direction is reversed on the downstream side of the twisting nozzle. Direction (untwisting direction), the crimp portion D having a relatively large loop is formed by the torque applied in the false twisting process in the previous step. At the same time that the crimped portion D is formed, the tension of the low melting point, low elongation thermoplastic multifilament yarn having a short yarn length is increased on the upstream side of the twisting nozzle, and the core yarn having the twist in the twisting direction is formed. On the other hand, the high melting point, high elongation thermoplastic multifilament yarn having a long yarn length is heat set in a wound state while generating loop fluff around the core yarn by false twisting torque. In this case, the heat setting temperature is
Since the melting point of the low-melting multifilament yarn is lower than the melting temperature, and it is twisted and heat-set together with the high-melting-point multifilament yarn wound around the core yarn, the morphological stability is high and the sheath yarn is highly advanced. Since it is wound around, an ununtwisted focusing part (a) with fine loop fluff is formed. Next, when the supply of the compressed fluid to the twisting nozzle is stopped, the untwisted and bundled portion a passes through the downstream side of the twisting nozzle without being untwisted, and then the untwisted portion c is downstream of the twisting nozzle. Pass by.

When the compressed fluid is supplied again to the twisting nozzle, the yarn portion that has passed through the upstream side of the twisting nozzle in the untwisted state is twisted in the untwisting direction downstream of the twisting nozzle.
At that time, the low melting point and low elongation thermoplastic multifilament yarn with a short yarn length has a high tension and forms a core yarn having twist in the untwisting direction, while the long melting point has a high melting point and a high elongation. The thermoplastic multifilament yarn is wound around the core yarn while generating loop fluff by false twisting torque, but since the twist propagates to the untwisted portion previously formed, the untwisted bundled portion An over-untwisted converging part (2) with a smaller twist density than that of (1) and relatively large loop fluff is formed.

The untwisted and overtwisted bundled portions of the yarn obtained above have a low melting point and low elongation thermoplastic multifilament yarn having crimps as a core yarn and a crimped waveform different from that of the core yarn. It has a high melting point and a high elongation thermoplastic multifilament yarn, which has good heat-fixing properties and is formed by winding it with a high-density twist, so that the loop fluff is fine and, therefore, a very spanlike feel. The appearance of the high-quality yarn is exhibited.

In the intermittent false twisting operation described above, in order to form the S twist portion and the Z twist portion of 500 mm or more in the composite processed yarn, the overfeed rate is 5 to 30% and the false twist number is 800 to 2000 T /
In the case of processing at a yarn speed of 100 m / min, it is preferable to repeat the twisting and stopping at random in the range of 0.2 to 2.0 seconds.

FIG. 2 is a schematic process drawing showing an embodiment of the method for producing the special composite textured yarn of the present invention. In Figure 2, low melting point, low elongation thermoplastic multifilament yarn A
And high melting point, high elongation thermoplastic multifilament yarn B
Are aligned by the supply roller 1 and fed into the false twisting area via the supply roller 1. Next, the false twisted and twisted body 3 continuously twists and heat-sets by the first heater 2 at a temperature at which the low melting point and low elongation multifilament yarn is melted, and untwisted downstream of the false twisted and twisted body 3. Then, the core yarn and the sheath yarn are partially adhered to each other and a yarn length difference is developed, and the first delivery roller 4 draws them as a composite yarn to the intermittent false twisting process.

In the intermittent false twisting process, the composite yarn is intermittently false twisted by the twisting nozzle 9 while being heat-set by the second heater 5, and the composite yarn has an S of 500 mm or more,
After the Z alternating twist is applied, it is wound onto the package 8 by the winding roller 7 via the second delivery roller 6.

In the present invention, as the twisted body for performing the false twisting and twisting operation continuously, a twisting nozzle using a compressed fluid, a spindle type twisting body by a belt drive, a friction type twisting body, or the like can be used. A false twisted and twisted body can be used. As the twisted body for intermittently performing false twisting, the above false twisted twisted body can be used, but a twisting nozzle is preferably used because of the ease of controlling intermittent false twisting and the durability of the device. To be

[0028]

EXAMPLES Next, the present invention will be specifically described by way of examples.

Examples 1-2 and Comparative Example 1 As shown in Table 1, polyethylene terephthalate (PE) was used as a high melting point, high elongation thermoplastic multifilament yarn.
T) The highly oriented undrawn yarn is a low melting point, low elongation thermoplastic multifilament yarn, nylon 6 drawn yarn (Example 1),
20 mol% isophthalic acid in the core and PET in the sheath
Using the drawn yarn (Example 2) and the PET drawn yarn (Comparative Example 1) made of the composite fiber of the modified polyester copolymerized, the special composite processed yarn was produced under the processing conditions shown in Table 2 according to the process shown in FIG. . Each of the obtained special composite processed yarns has S-twisted parts and Z-twisted parts with an average length of 800 mm alternately.
A large number of arch-shaped loop fluffs were formed on the surface of the yarn and had a span-like appearance. Moreover, when the deviation degree was measured, it was as shown in Table 1.

[0030]

[Table 1]

[0031]

[Table 2]

The obtained textured yarn was used as a warp and a weft, and was woven into a 2/2 twill design with a warp density of 72 yarns / 2.54 cm and a weft yarn density of 73 yarns / 2.54 cm. The textured yarns obtained in Examples 1 and 2 did not cause misalignment between the core and the sheath yarns at the time of weaving, and the obtained woven fabrics had a natural uneven texture like natural spun yarns and were spun. It had a feeling like.

On the other hand, Comparative Example 1 in which the deviation degree of the sheath yarn is 1.5
The textured yarn obtained in step 1 is inferior in quality due to the occurrence of misalignment between the core and sheath yarns during weaving, and the woven fabric obtained by weaving is thus inferior in quality, and the core yarn and sheath yarn are also inferior. Since both of them melted and adhered, the texture was hard and far from the spanlike texture.

[0034]

The special composite processed yarn of the present invention has a high morphological stability because the core yarn and the sheath yarn are integrated by both the adhesion with the sheath yarn by the fusion of the core yarn and the alternate twisting of S and Z. It has excellent processability during weaving and weaving, and the presence of loop fluff formed on the surface of the yarn can impart a spanlike texture to the fabric obtained by weaving and weaving. it can.

Further, according to the manufacturing method of the present invention, it becomes possible to easily and stably manufacture the special composite textured yarn having the above advantages.

[Brief description of drawings]

FIG. 1 is a schematic external view showing an embodiment of a special composite textured yarn of the present invention.

FIG. 2 is a schematic process drawing showing one embodiment of a method for producing a special composite textured yarn of the present invention.

[Explanation of symbols]

 A Z twisted portion (untwisted bundled portion) S S twisted portion (overtwisted bundled portion) A low melting point, low elongation thermoplastic multifilament yarn B high melting point, high elongation thermoplastic multifilament yarn 2 First heater 3 False-twisted body 5 Second heater 8 Package 9 Twisting nozzle 10 Loop fluff

Claims (2)

[Claims] 1. A core yarn and a sheath yarn having an average length of 500 mm or more
A two-layer structure yarn integrated by alternating twists of Z twist and Z twist, wherein the core yarn and the sheath yarn are not entangled, only the core yarn is melted, and the loop fluff exists on the surface of the yarn, and , A special composite processed yarn characterized in that the degree of deviation of the sheath yarn is zero. 2. A high melting point, high elongation thermoplastic multifilament yarn and a low melting point, low elongation thermoplastic multifilament yarn having a melting point of 20 ° C. or more lower than that of the multifilament yarn are aligned to obtain a low melting point, low melting point. The false twisting process is performed at a temperature at which the elongation multifilament yarn does not melt and the high melting point and high elongation multifilament yarn does not melt, and then the low melting point and low elongation thermoplastic multifilament yarn does not melt at an intermittent temperature. A method for producing a special composite textured yarn, which is characterized by performing a false twisting operation.