JPS6247977B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a composite temporary twisting technique. More specifically, the present invention relates to a method for producing a bulky yarn in which a portion of a multifilament yarn is fused. (Prior art) Temporary twisted yarn is known to have bulkiness, but ordinary twisted yarn has poor drapability, lacks warmth to the touch, and is monotonous in color. The following shortcomings have been pointed out. Various attempts to improve these drawbacks have been proposed, but while they are effective, they also create new drawbacks. For example, a mixed fiber twisted yarn with two yarns of different fineness is knitted,
Separation and slippage of the yarns are a problem when passing through various processes for weaving, and yarns with different melting points are aligned, fused, and temporarily twisted, resulting in a dry touch, but the fused portions are concentrated. If you do so, the touch will become rough and hard, or the bulkiness will decrease, making it impossible to obtain a desirable texture. As a known example similar to the present invention, there is
Publication No. 24529, Japanese Patent Application Laid-Open No. 1973-93646, Japanese Patent Application Publication No. 1973
-136952 publication exists. However, all of these known examples relate to temporary twisting of two-component yarns, which improve bulkiness,
It was not possible to improve the rough hardening of the tatsuchi. (Problems to be Solved by the Invention) An object of the present invention is to improve the drawbacks of the conventional method described above, and to provide a multifilament mixed yarn comprising a low melting point filament and a high melting point filament, and By temporarily twisting at least two yarns of the low melting point filament in the yarn and another yarn having a melting point difference of at least a specific temperature, the bulkiness and texture are excellent, and in addition, the knitting and It is an object of the present invention to provide a method for producing bulky yarn with good weavability. (Means for Solving the Problems) In order to achieve the above object, the method for manufacturing bulky yarn of the present invention comprises the following constituent elements. That is, the first invention of the present application provides a multifilament mixed yarn comprising a low melting point filament and a high melting point filament having a melting point difference of at least 4°C, and the low melting point side of the mixed fiber yarn. At least two other multifilament yarns having a melting point 4° C. or higher higher than that of the filament are used, and between these yarns, the mixed fiber yarn has a low yarn supply compared to other yarns. The method is characterized by supplying the filament to a pre-twisting processing area with a difference in temperature, and performing the pre-twisting process by setting the temperature of the pre-twisting hot plate to be above the fusing temperature of the low melting point filament and below the fusing temperature of the high melting point filament. The second invention is a method for producing a bulky yarn, and the second invention also includes a polyester multifilament undrawn mixed fiber yarn comprising a low melting point filament and a high melting point filament having a melting point difference of at least 4°C. , using at least two other polyester multifilament undrawn yarns having a melting point 4° C. or higher higher than that of the low melting point filament in the undrawn mixed yarn; The undrawn mixed fiber yarn is supplied to the drawing and twisting processing area at the same time with a feeding difference that makes the yarn feed lower than other undrawn yarns, and the temperature of the heating plate for the temporary twisting is adjusted to the temperature of the low melting point undrawn filament. Above the fusion temperature,
This is a method for producing a bulky yarn characterized by carrying out tentative twisting at the same time as stretching at a temperature lower than the fusing temperature of a high melting point undrawn filament. (Function) The present invention will be explained in more detail below. According to the present invention, by using the yarn and setting the processing conditions as described above, a bulky yarn having yarn length differences between yarns and in which some fibers of the yarns are fused can be obtained. The bulky yarn produced by the manufacturing method of the present invention does not have a concentration of fusion points as seen in conventional fusion-bonded false yarns, and thus can avoid rough hardening due to fusion. Figure 1 shows one of the bulky yarns obtained by the present invention.
The illustrative cross-sectional model diagram, FIG. 2, is a process schematic diagram illustrating an embodiment of the method of the present invention. As shown in FIG. 1, in the bulky yarn according to the present invention, the low melting point filament 1 in the mixed yarn serves as a fusion component, and the low melting point filament 1 and the mixed fiber yarn are bonded to each other, and the low melting point filament 1 and the mixed yarn The non-fused multifilament 3 that formed the yarn other than the high melting point filament 2 or the mixed fiber yarn in the yarn does not have a uniform structure even in the yarn axis direction due to the migration of the low melting point filament, and is substantially There is intermittent fusion, and substantially the entire filament is not fused to any yarn. A mixed fiber yarn of a low melting point filament and a high melting point filament can be produced by co-spinning or separate spinning followed by fluid processing, or by a post-compounding method such as electro-spinning. According to the findings of the present inventors, the low melting point filament yarn in the mixed fiber yarn does not impair the twisted yarn properties, so it is more preferable than the high melting point filament yarn in the mixed fiber yarn and other filament yarns. It is necessary that there is a difference in melting point of at least 4°C from that of the steel. For example, as a method of imparting a melting point difference of 4° C. or more to polyester filament yarns, addition of a third component, changing the copolymerization ratio of polyester copolymerized with diethylene glycol, etc. may be used. In the present invention, a multifilament mixed yarn comprising a low melting point filament and a high melting point filament, and another multifilament yarn having a melting point 4° C. or higher higher than that of the low melting point filament in the mixed fiber yarn. At least two yarns are supplied to the temporary twisting processing area with a difference in yarn supply between these yarns that makes the mixed fiber yarn have a lower yarn supply compared to the other yarns, and are heated by temporary twisting. Temporary twisting is carried out by setting the plate temperature above the melting temperature of the low melting point filament and below the melting temperature of the high melting point filament. The fiber yarn A is twisted from the package 4 through the Snell wire 5, the guide 6, the feed roller 7, the hot plate 8, the twisting device 9, and the delivery roller 10. On the other hand, the other multifilament yarn A′ is
The mixed yarn A is passed from the package 4' through the Snell wire 5', the guide 6', and the feed roller 7'.
They are aligned, processed through a hot plate 8 and a temporary twisting device 9, and wound up into a winding package 11. Due to the difference in yarn feeding tension between the mixed yarn A and the multifilament yarn A', the mixed yarn mainly constitutes the core portion and the other yarn mainly constitutes the sheath portion due to the difference in yarn feeding tension based on the yarn feeding difference. , which exhibits a thread structure as shown in FIG. The yarn feeding method for the yarns A and A' is not limited to the active yarn feeding method illustrated in the drawings, but also a passive yarn feeding method can be adopted. In the present invention, it is necessary to make the mixed yarn as described above have a lower feed rate (low yarn feed) than other yarns. In addition, when using a total of three or more types of yarns, including a mixed yarn and two or more types of other yarns, at least one type of other yarns may have a high feed rate with respect to the mixed yarn. It is something. The obtained bulky yarn is continuously processed or
Separately, by subjecting the yarn to relaxation heat treatment after processing, it is possible to create a yarn with low torque and high bulkiness. In the method of the present invention, in the combination of a low melting point filament and a high melting point filament in a mixed yarn, or in combination with another multifilament yarn, changes in fineness, number of filaments, etc., irregular cross-section yarn, different dyeing, etc. Unique color effects, fineness mix effects, etc. can also be obtained by using natural yarns, dyed yarns, etc. Yarns other than the mixed yarn containing low melting point filaments are not limited to thermoplastic yarns. Furthermore, the temporary twisting and drawing processing may be performed at the same time, and in particular, undrawn multifilament yarn is used as the mixed fiber yarn on the low yarn supply speed side (the side that substantially constitutes the core). , temporary twisting may be performed at the same time as stretching. In this case, the fusing temperature of the low melting point undrawn filament yarn changes depending on the degree of drawing, so by adjusting the hot plate temperature, part or all of the low melting point filament yarn can be fused to the desired degree. It is something that can be done. In this case, it is possible to save labor and speed up processing through continuous processing, and to lower production costs. It is sufficient to use a twisting machine or a tentative twisting machine with a differential yarn feeding system. The temporary twisting spindle may be of any type, such as a temporary twisting pin type, a friction type, or an air type. When carrying out drawing and simultaneous temporary twisting using such undrawn yarns, if polyester undrawn multifilament yarns are used, the melting point of the yarns is almost the same as that of drawn yarns, but Since the degree of fusion changes at a lower temporary twisting temperature than the previous one, combined with the melting point difference between the filaments in the undrawn mixed yarn, it is especially important to control the degree of fusion of bulky yarns. It is excellent. With this configuration, fusion occurs at the meeting point (existence point) of the low melting point filaments in the mixed fiber yarn.
Moreover, since the fusing of some filaments can be easily controlled, the resulting bulky yarn can be made into one with excellent weaving properties, and the knitted fabric can have extremely high bulk and soft texture. It is possible. Furthermore, when carrying out drawing and simultaneous temporary twisting using a polyester-based running-stretched mixed yarn, in addition to the yarn feeding difference, if the birefringence difference between the mixed yarn and other polyester yarns is large, The yarn length difference also becomes larger. When using such a method, experimental results show that the difference in birefringence between the mixed yarn and other yarns should be at least 2×10 ^-3 or more, and even more preferably 5×10 It is most desirable to use yarn with a birefringence difference of ^-3 or more. (Experimental example) Example 1 (first invention) A mixed fiber yarn consisting of polyester multifilament (50D-24F) with a melting point of 260°C and polyamide multifilament (25D-12F) with a melting point of 220°C, Using a polyester multifilament yarn (75D-36F) whose temperature was 260°C, a bulky yarn was produced by processing it according to the method shown in FIG. 2 under the following conditions. Processing speed: 100m/min Number of temporary twists: 2400T/M Heater length: 1060mm Heater temperature: 227℃ Overfeed rate: 0% Yarn feeding difference rate: 25% However, Overfeed rate = [1 - delivery roller (10) peripheral speed / Feed roller (7) peripheral speed] × 100 Yarn feeding rate difference = [Feed roller (7') peripheral speed / Feed roller (7) peripheral speed - 1] × 100 The obtained yarn is the core yarn of the alternately twisted yarn. Some of the filaments were fused together (Fig. 1), and the yarn was bulky and soft and did not cause yarn slippage. The various yarn characteristics of the bulky yarn thus obtained were as shown in Tables 1 and 2 below.

【table】

[Table] When this bulky yarn was used to knit a 20G double knit (Milan rib texture) and finished under normal finishing conditions, there was no yarn slippage during knitting, and it showed good knitting properties. A soft knitted fabric with a rich texture was obtained, and a product with substantially no rough or hard feeling due to the fusion component was obtained. Example 2 (first invention) Mixed fiber yarn consisting of polyester multifilament (25D-12F) with a melting point of 260°C and polyester multifilament (25D-12F) with a melting point of 228°C, and spun yarn with a melting point of 260°C Polyester multifilament yarn (black, 50D-24F) was used, and one side was a polyester multifilament yarn (75D-24F) with a melting point of 260°C, using the method shown in Figure 2, except for the following conditions. A bulky yarn was produced by processing under exactly the same conditions as in Example 1. Number of temporary twists: 2250T/M Heater temperature: 236℃ Weaving the obtained bulky yarn (structure 2/2 twill)
However, when the fabric was subjected to a conventional finishing process, a fabric was obtained that was soft, bulky, and had excellent elasticity. Moreover, there were no troubles during weaving. Example 3 (second invention) Polyethylene terephthalate polymer (o-
Intrinsic viscosity measured in chlorphenol at 25°C
The IV was 0.66 and the melting point was 262°C. ) and a copolymer with similar denier and filament number, but with isophthalic acid added to the acid component so that the ratio of terephthalic acid to isophthalic acid was 9:1 during polymerization (IV measured in the same way was 0.63, melting point 243° C.) were uniformly mixed and spun simultaneously (spinning speed: 3000 m/min) to obtain an undrawn mixed fiber yarn (Y ₁ ). On the other hand, undrawn yarn (Y ₂ ) was obtained by spinning polyethylene terephthalate (spinning speed: 2500 m/min) into a filament of 150 denier and 48 filaments when stretched. The melting point of this undrawn yarn _Y2 was 260°C. This polyethylene terephthalate yarn and Y ₂
The birefringence of undrawn yarn is 36×10 ^-3 and 23×, respectively.
It was 10 ^-3 . Using these threads (Y ₁ , Y ₂ ),
Stretching and simultaneous twisting was carried out under the following conditions using a simultaneous drawing and twisting machine capable of providing a normal yarn feeding difference. Processing speed: 120m/min Number of temporary twists: 1700T/M Heater length: 1060mm Heater temperature: 215℃ Stretching ratio: 1.7 Relaxation ratio: 12% (Secondary heater 200℃, 1060mm) Wind ratio: 6% Yarn feeding difference rate: 7% Stretching ratio of _Y1 : 1.7 The yarn feeding difference ratio is the yarn feeding speed ratio of _Y2 to _Y1 . The yarn properties of the obtained bulky yarn were as shown in Tables 3 and 4 below.

【table】

[Table] When this bulky yarn was used to knit a 14G double knit (pontiloma), it had extremely good knitting properties and exhibited a good texture with great bulk. (Effects of the invention) The bulky yarn obtained by the method of the invention has (1)
There is a difference in yarn length between yarns. (2) There are parts with different crimp characteristics (number of crimp, degree of crimp) between the filaments and in the longitudinal direction of the filament. (3) The low melting point filament yarn is partially or completely fused at its meeting point (existence point). These yarn characteristics are determined by the difference in yarn length (1) due to the yarn feeding difference, and also due to the birefringence difference in the case of draw twiling, and the crimping (2) due to the number of twipes, heating temperature, etc. It depends on the characteristics and the degree of fusion (3). The yarn obtained by the present invention includes the above (1), (2),
By combining the characteristics of (3), it has the softness and feel of spun yarn without sacrificing the bulkiness and resilience against deformation of temporarily twisted yarn. It has the effect of suppressing yarn migration, exhibiting the effect of (2) above, improving the convergence of filament yarns, preventing slippage between yarns, and improving process passability during weaving and weaving. The crimp characteristics of the filament yarns in the above examples were determined by taking approximately 5 cm of the bulky yarn processed by the method of the present invention, dividing it into fibers with care, and measuring it using the following method. Number of crimps (pcs/25mm) = n/L x 25 Degree of crimping (%) = L-L'/L x 100 where n: Number of coils L': Length L under initial load (2mg/d) : Length under constant load (0.3 g/d) The difference in yarn length was similarly measured by taking approximately 50 cm of bulky yarn, carefully separating it, and measuring it using the following method. Yarn length difference (%) = L ₁ - L ₂ / L ₂ × 100 where L ₁ : Length of long yarn under constant load (10 mg/d) L ₂ : (Same as above) Length of short yarn The number of fused threads is 10 by taking a cross-sectional photo of the bulky thread.
The number of fused filaments was calculated by photographing each location and using the average value.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional model diagram showing one example of bulky yarn obtained by the present invention, and FIG. 2 is a process schematic diagram illustrating the manufacturing state of the method of the present invention. 1: Low melting point filament of mixed fiber yarn, 2: High melting point filament of mixed fiber yarn, 3: High melting point multifilament, 4, 4': Package, 5, 5': Snell wire, 6, 6': Guide, 7, 7': feed roller, 8: hot plate, 9: temporary twisting device, 10: delivery roller, 11: winding package.

Claims (1)

[Scope of Claims] 1. A multifilament mixed yarn comprising a low melting point filament and a high melting point filament having a melting point difference of at least 4°C, and a multifilament mixed yarn comprising a low melting point filament and a high melting point filament having a melting point difference of at least 4°C, At least two other multifilament yarns having a melting point higher than that of The bulky yarn is supplied to a pre-twisting processing area, and the pre-twisting process is carried out by setting the temperature of the pre-twisting hot plate to be above the fusing temperature of the low melting point filament and below the fusing temperature of the high melting point filament. Production method. 2 A polyester multifilament undrawn mixed fiber yarn comprising a low melting point filament and a high melting point filament having a melting point difference of at least 4° C. At least two other polyester-based multifilament undrawn yarns having a melting point higher than ℃ are used, and between these yarns, the undrawn mixed fiber yarn is used with a lower yarn supply than the other undrawn yarns. The filament is fed to a drawing and simultaneously pre-twisting processing area with a feeding difference of 1. A method for producing bulky yarn, characterized by performing temporary twisting at the same time as stretching.