JPS6141341A - Production of slub 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 Field of Industrial Application The present invention relates to a method for manufacturing slub yarn with high drape properties in which the yarn is thick and thin in the longitudinal direction.

BACKGROUND OF THE INVENTION Slab yarns, which are thick and thin in the longitudinal direction of the yarn, are used as a means to change the appearance of fabrics.

As a method for obtaining slub yarn, for example,
Bulletin No. 28258, Japanese Patent Publication No. 45-28018, Japanese Patent Publication No. 35147-1982, Japanese Patent Publication No. 1987-68125
No. Publication, Special Publication No. 51-30174, % Opening 66-
Many proposals have been made, such as Publication No. 148925. However, these proposals have poor convergence of the winding yarn and core yarn,
There is a problem of misalignment of the dump part, and in order to satisfy this problem, high heater temperature conditions are adopted.For example, ester yarn is heated to 230-240℃, the core yarn is first-twisted, and the core yarn and Proposals have been made to use mixed fibers of wrapped yarn. Both of these methods of slab light spreading involve crimping the yarn by heat setting with a false twisting heater, resulting in poor drapability of the fabric and only a stiff texture.

In addition, there are some proposals to form countless loops of filaments of wrapped yarn around the core yarn without heat setting in the false twisting heating region, but this is similar to the method for forming yarns obtained by the phase difference false twisting method without heat setting. This suggests that the strips have a looped shape.

Therefore, the obtained fabric has protruding loops, and
The yarn has poor unwinding properties due to the protrusion of the loops, and the slab portion is misaligned, resulting in very poor handling properties.

In order to improve this, the wrapped yarn is first twisted, the direction of twist of the wrapped yarn is opposite to the false twisting direction, and the process is performed under a specific number of false twists. As a result, improvements have been made to reduce the occurrence of loops in methods that do not perform heat setting in the false twist heating region. however,
This method requires first twisting, high processing cost, and
There are also problems in handling pre-twisted yarn.

Similarly, slub yarns having thick and thin threads in the longitudinal direction are disclosed in Japanese Patent Application Laid-Open No. 59-59927 and Japanese Patent Application Laid-open No. 59-59.
Proposals such as Publication No. 928 have been made. however,
The slub yarn produced by these methods has variations in yarn quality between and within the spindles (slub part misalignment, neps, loose yarns, etc.), and the suitable conditions for false twisting are narrow. Difficult to perform stable machining. That is, there are problems with operational stability, and it is difficult to produce it industrially.

Purpose of the Invention The inventors have conducted intensive studies on this point, but
In the phase-difference false twisting method in which the heated yarn A is wound with another fiber yarn B, the problem could not be solved with a method of heat treatment in the false-twisting/untwisting region, even after examining various conditions. . Therefore, we changed our thinking and decided to change the false twist heating range, which was considered taboo to achieve the purpose of the present invention because conventionally only products with crimping, poor drapability, and stiff texture could be obtained. By combining heat treatment and heat treatment in the untwisting region, we have discovered a method that allows stable slab processing without industrial variation, contrary to expectations, and have completed the present invention.

The structure of the invention, that is, the gist of the present invention is to overfeed the heated yarn A with a fiber yarn B having the same softening point or a higher softening point than the yarn A. In the phase difference false twisting method, fiber yarn B is
This method of producing slub yarn is characterized in that when heat treatment is performed at a temperature higher than the softening point of the yarn, the heat treatment is also performed in the false twist heating range.

A foolproof way to solve problems Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an example of an apparatus used in an embodiment of the present invention.

In FIG. 1, yarn A is heated and untwisted by a heating device 5 installed between a first supply roller 1 and a take-off roller 3.

At this time, a tension device may be used to replace the first supply roller. Further, the heating device may be a spindle type, a friction type, or an air false twisting device having joint circulation, which is used in normal false twisting processing. On the other hand, the multi-fiber yarn B is over-supplied to the heating area by the second supply roller 2, and the yarn A
During winding, tension changes occur in the fiber yarn B depending on the balance between yarn length and supply amount, and the winding position changes to form a slab, and the heating device 6-1 heats the fiber yarn B. Processing is performed. Next, the slab yarn on which the slab has been formed passes through a heating device, is heated by a heating device 6-2 provided in the untwisting area, passes through a take-up roller 3, and is then taken up by a winding roller 4. It is wound up.

To give a more detailed explanation based on Table 1, yarn A is a polyester 75 denier yarn with a softening point of 240°C, and fiber yarn B is a polyester 50 denier yarn with a softening point of 240°C, as shown in Figure 1. Using a false twisted column, processing was performed under the conditions shown in Table 1.

It is possible to use any thermoplastic filament yarn such as ester, nylon, or acrylic filament yarn as the supply yarn.

Preferably, the yarn B is a thermal melting point type yarn such as ester or nylon.

Yarn A and yarn B may be the same, and yarn A may have a lower softening point than yarn B.

In this case, the entire yarn A may be made of a low-softening point component, or a part of it may be made of a low-softening point component, such as a mixed yarn or a conche f-) yarn.

The number of false twists of yarn A is 12,000 to 20,700 in terms of twist coefficient (however, twist coefficient - number of false twists × Vτ]) -, but the occurrence of loops and filament loop yarns is small. , as a more preferable condition, the twist coefficient is 13800.
~19,000. When the twist coefficient is high, the untwisted portion of the slab forming part in the untwisted region is concentrated in the non-slab area, but the untwisted portion that cannot be absorbed in the non-slab area is absorbed by the outermost layer of the slab part. Loops and loose yarns are likely to occur due to untwisting. In addition, when the twist coefficient is low, the twist pitch of the slab forming part is coarse, the tightening of the fiber yarn B to the yarn A is weak, the degree of fixation of the slab is weak, and the slab effect may be weak. . FIG. 3 shows the range of twist coefficients, and the stable twist coefficient in the conventional method of heat treatment only in the false-twisting/untwisting range is 13,800 to 17,300. On the other hand, in the method of heat treatment in the false-twisting heating region and the false-twisting/untwisting region of the present invention, the stable twist coefficient is 12,000 to 20,700, which means that the stable processing region is wide. This indicates that industrial productivity will improve.

Next, the processing tension of the yarn during processing is 0.2 to 0.4 g/d (however, in the part where the fiber yarn B is wound), when the blood is removed from the first supply roller of yarn A. , d is the denier of yarn A) is the most preferable condition in terms of the degree of fixation of the slab, the occurrence of loops, and the occurrence of cut threads during processing. Yarn A of fiber yarn B
It is preferable that the tension in the winding is 1 g or less and the tension is fluctuating.

The feed rate of the delicate yarn B to the yarn A is appropriately selected depending on the horizontal distance between the guide 7 and the yarn A, the length of the slab portion to be formed, processing stability, etc.
It is preferable to carry out the operation at an overfeed rate of 0 or more and a feed rate at which cut threads occur. Figure 4 shows the range of feed rate for winding, and the optimum winding of fiber yarn B in the conventional method of heat treatment only in the false-twisting/untwisting region is, for example, 75d1 fiber for yarn A. When the yarn B is 50 d and the twist coefficient is 13856, it is within the range of 70 to 80 t. By taking 70-8
Stable processing is possible over a wide range down to 0%. This shows that the present invention is excellent in industrial productivity.

Next, the heat treatment in the false twisting heating region is performed at a temperature higher than the glass transition temperature of the fiber yarn A, preferably 140°C or higher, and more preferably higher than the softening point temperature of the #miscellaneous yarn A. Rub. After the yarn in which the slab has been formed is heat-treated in the heating device 6-1, it passes through the heating device to an untwisting area, where it passes through the heating device 6-1.
-2 and heat treated above the softening point.

That is, in the present invention, a heating device is provided in each of the heating zone and the untwisting zone, and the temperature in both the heating and untwisting zones is preferably higher than or equal to the softening point temperature of the fiber yarn A and lower than the melting point, and more preferably the temperature in the untwisting zone is raised. It is characterized by heat treatment. As shown in Table 1, this is true even if heat treatment is applied after passing through the untwisting region, that is, the second
Even if heat treatment is performed in the heater area, the yarn dye once formed cannot be improved, and the loop will only become slightly shorter as the filament shrinks, and the fixing effect of the slab will be the same as expected. Can not. Also, Futama.

The gap in the weight is also large, and loose yarns and neps are likely to come out.

On the other hand, by applying heat treatment to both the heating and untwisting regions as in the present invention, as shown in Fig. 2, there is no generation of loops, loose yarns, nep, etc., and the head of the slab is made of twisted yarn. are wrapped around each other in the form of a highly twisted covering ring.
Moreover, the slab fixation is very strong, and a stable slab part with excellent shape retention, which could not be obtained conventionally, can be obtained, and in terms of workability, there is no variation between or within the weights.
A slub yarn that can be produced industrially is obtained. On the other hand, a slub-like fabric that is softer and has better drapability can be obtained. Furthermore, it is also possible to give a textured feel by controlling the heat treatment temperature.

Furthermore, in the present invention, from the heating device 5 to the take-up shear roller 3, no guides are used to stop the ballooning of the yarn that occurs due to the untwisting action, so that the ballooning occurs naturally within the heating device. The shape of the slab will be stable (if the slab is run in a state where it is in contact), and from this point of view, it is desirable to use a non-contact type heating device.

Furthermore, the heat treatment temperature T1°C in the heating region and the heat treatment temperature T2°C in the untwisting region are preferably T1≦T2+20°C. In addition, it is better to treat both upper limits at temperatures below the melting point temperature of the fiber yarn A. Effects of the Invention As stated above, the slab yarn obtained by the method of the present invention has a lower temperature than the melting point of the fiber yarn A in the conventional heating range. A fabric with flexibility and high drapability that cannot be obtained with a slub yarn having crimps obtained by heat treatment only in the untwisted region, and a slub yarn having crimps obtained by heat treatment only in the untwisting region, and
The solidity of the slab was strong, and there was no variation between or within the weights, making it possible to produce it industrially.The post-processing process was also stable, making it possible to efficiently produce the ideal slab yarn.

Margin below Example Examples of the present invention will be shown below.

Example 1 Polyester #75d/36f (softening point 240°C) was used as yarn A, polyester 50d/24f (softening point 240°C) was used as yarn B, and the processing speed (
Take-up roller speed) 40 ru, number of false twists 172077M
(Z heating), Yarn B Noy4-PiKt-70% overfeed, the tension of yarn A during processing was 159, the temperature of the heating device installed in the heating area was 230°C, and the temperature of the heating device installed in the untwisting area was The processing was performed under the condition that the temperature of the heating device was 240°C. As a result, the obtained slub yarn has an average slub length of 8
The largest m1 is approximately 15 crn1 the smallest is approximately 3 cW
It was 1.

The length of the non-slab part is average 13I:nl, maximum 30cr1
1. The frequency of occurrence of slabs was 4-5 1 mm combs. As shown in FIG. 2, the shape of the slab portion S is that the slab head 11 is in the form of a highly twisted covering ring, the length of the highly twisted covering portion is 1G or less, and the yarn A is The filament fused yarn B around the core yarn 8 and the ♀ becomes the winding yarn 9 and is wound around the core yarn 8 and the 2f portion S is a fiber yarn that is firmly fused. Therefore, the fixation of the slab was extremely strong. 10 is the outermost yarn layer of the slab section, and 12 is the bottom of the slab section. Moreover, as shown in Table 2, there was no occurrence of loose yarns, neps, etc., and stable slab processing was possible without any industrial variation. The slab was processed in the same way.

Table 2 When the obtained slub yarn was woven using the warp,
There is no trouble due to misalignment of slabs during weaving, and the dyed finished fabric does not include false twist crimp in the slub yarn, so it is a slub yarn fabric with very good drapability, moderate crispness, and dry touch. was gotten. Furthermore, by applying alkali weight loss to the fabric, a slab fabric with a silky texture was obtained.

Example 2 Polyester 75a/36f (softening point 210°C) was used as yarn A, and yarn BE polyester 100 d/72 f (
Processing was carried out under the same conditions as in Example 1, except that the feed rate of yarn B was 90 degrees.

The obtained yarn has an average slab length of 10 (1'1lf).
The average length of the non-slub part is 15 combs, and 4 1 mm comb slabs occur, and the degree of fixation of the slab part is high, and the dyed finished fabric woven using this yarn has excellent drapability and a slub effect. A hemp-like slub fabric with a strong crispness and noticeable texture was obtained.

If the above-mentioned combination of yarns in which the winding yarn has a larger venier than the core yarn causes problems such as poor slab form, loop formation, and weak slab fixation, the slub effect causes the winding yarn denier to decrease. It was difficult to process even though the core yarn denier was emphasized. However, the method of the present invention has made it possible to achieve this.

[Brief explanation of the drawing]

FIG. 1 shows an example of an apparatus used in an embodiment of the present invention. Figure 2 shows the slub yarn obtained by the present invention, No. 31...
First supply roller, 2...Second supply roller, 3...
・Take-up sheet roller, 4... Take-up sheet roller, 5...
Heating device, 6-1.6-2... Heating device, 7... Guide, 8... Core thread, 9... Wound thread, 10...
・Slab part outermost layer yarn, 11... Slab head, 12.
... Slab butt part, S... Slab part. Fig. 1 Δ Fig. 3 Twisting coefficient Fig. 4 Distortion feed rate ('/,)

Claims (1)

[Claims] In the phase difference false twisting method, fiber yarn B, which has the same softening point or a higher softening point than yarn A, is wound around heated yarn A while overfeeding yarn A. A method for producing slub yarn, characterized in that when heat treatment is performed at a temperature higher than the softening point of fiber yarn B in the twisting/untwisting region, heat treatment is also performed in the false twisting heating region.