JPS62289634A - Interlaced composite processed yarn and its production - 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] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an alternately twisted composite textured yarn and a method for producing the same, particularly,
It has good passability during the weaving process, and when made into a fabric, it has a soft and crisp surface touch.
Furthermore, ironing sometimes relates to alternately twisted composite textured yarns in which the occurrence of wrinkles is so slight that it does not pose a problem in practice, and to methods for producing the same.

[Prior art]

Conventionally, composite false twisted yarns having a core/sheath structure have been known, but most of them have the disadvantage of being soft but fluffy when made into woven fabrics.

On the other hand, woven fabrics using alternatingly twisted single yarns other than composite yarns have a strong crispness and feel hard to the touch, and also have the problem of noticeable wrinkles that sometimes occur when ironed.

[Purpose of the invention]

The object of the present invention is to have good passability in the weaving process, and to have a soft and crisp surface touch when made into a woven fabric. Another object of the present invention is to provide an alternately twisted composite textured yarn that is so light that it does not cause any problems, and a method for producing the same.

[Structure of the invention]

That is, in the alternately twisted composite processed yarn having a core/sheath structure of the present invention, untwisted parts and overtwisted parts exist alternately with irregular lengths in the length direction of the yarn, and the untwisted parts are The core and sheath in the over-twisted part have substantially the same twist direction and twist density, and the core and sheath in the over-twisted part also have substantially the same twist direction and twist density, and the core in the untwisted part has substantially the same twist direction and twist density. It is characterized by having partial fusion between the single fibers constituting it.

Further, the method for producing the alternately twisted composite processed yarn according to the present invention includes:
The thread that will eventually become the core and the thread that will eventually become the sheath,
Use a single false twisting device to perform heating, heat setting, and untwisting,
When manufacturing an alternately twisted yarn in which untwisted parts and overtwisted parts exist alternately in the length direction of the yarn, the yarn that will eventually become the core has a higher elongation than the yarn that will eventually become the sheath. Use yarn with a low temperature and a melting point of 10°C or more lower, and the overfeeding rate of the yarn that will eventually become the sheath is within 40%, and within the range where no vibration occurs back and forth in the direction of travel at the confluence of the yarns. False twisting is carried out at such a heat setting temperature that at least a portion of the filaments of the yarn that will eventually become the core fuse together.

The alternately twisted composite processed yarn of the present invention has a good convergence effect because the core and sheath parts are alternately twisted, and in addition, the single fibers constituting the core yarn in the untwisted part Since the comrades are partially fused together, the alternately twisted structure is stable against external forces. Therefore, the alternately twisted composite textured yarn of the present invention has good passability during the weaving process.

It is preferable that the single fibers constituting the sheath are not fused together, but even if they are fused, it is desirable that the degree of fusion be less than that of the single fibers constituting the core. If the single fibers that make up the sheath are excessively fused together, it will not only hinder the soft touch of the processed yarn itself (but also inhibit the soft and crisp surface touch when made into a woven fabric). This is because there is a risk of

In addition, in order to maintain the stability of the alternately twisted structure, the phase of the core and the sheath in the untwisted part are substantially the same, and the phase of the core and the phase of the sheath in the overtwisted part are substantially the same. It is desirable that the phases be substantially the same.

Furthermore, by using thick fibers with a single denier in the core and thin fibers with a single denier in the sheath, a composite textured yarn with a soft surface touch and rich tension, stiffness, and resilience can be obtained.

Furthermore, if a low melting point polyester fiber is used in the core and a cationically dyeable polyester fiber is used in the sheath, a composite textured yarn with a unique color effect can be obtained. Similarly, if the core yarn and sheath are made of a combination of low melting point polyester/nylon 66, nylon 6/nylon 66, nylon 6/polyester, etc., different color effects can be obtained because each has different dyeing properties. .

Further, it is desirable that the difference in yarn length between the yarn constituting the core portion and the yarn constituting the sheath portion be 20 to 50%.

If the yarn length difference between the core yarn and the sheath portion is large in this way, the yarn will have a soft touch even though it is an alternately twisted yarn.

Here, the yarn length difference between the core yarn and the sheath part is determined by returning the twists of the untwisted part and the over-untwisted part to O (zero) using a twister, and the length of the core yarn is 2°). The length i,) of the sheath portion is measured and determined by the following formula.

In addition, the twist density of the untwisted part is 21,000/41 (T/
m) or more, the twist density of the over-twisted part is 9°ooo/Jπ(
T/m) or more is desirable. When the twist density is as high as this, when made into a woven fabric, it will have a fluffy feel due to the large yarn length difference, a so-called crunchy texture without fluff. Moreover, when dyed, a deep effect can be obtained.

Further, it is desirable that the average length of the untwisted portion accounts for 20% or more of the entire length of the yarn. As described above, when the average length of the untwisted portion accounts for a high proportion of the entire length of the yarn, when it is made into a woven fabric, the appearance given by the alternating twist pitch becomes beautiful.

The ratio of the average length of the untwisted part to the total length of the yarn is 2.
If it does not reach 0%, the twist density of the over-untwisted part becomes too loose, and the looseness between the core yarn and sheath part becomes large, and the sheath part, which has a long yarn length, moves with a slight external force such as squeezing, and the nep This is undesirable because it causes

On the other hand, in carrying out the method of the present invention, it is desirable to use a yarn that will eventually become the core and has a melting point 10° C. or more lower than the yarn that will eventually become the sheath. If the melting point of the core yarn is low, there is no need to set the heat setting temperature extremely high, which not only improves the setting effect during the dyeing process, but also reduces the wrinkles that occur during ironing due to alternate twisting. , can be kept within a reasonable range. Furthermore, by using a yarn with a low melting point as the core yarn, fusion of the sheath portion can be minimized, making it possible to prevent hardening of the texture. Furthermore, power consumption for heat fixation can be reduced.

Further, it is desirable that the overfeeding rate of the yarn that will eventually become the sheath portion be within 40%, and that the excessive amount of yarn be fed within a range that does not cause back-and-forth vibration in the direction of movement at the yarn confluence point. If the overfeed rate of the sheath section is too high, vibrations will occur back and forth in the direction of yarn travel at the confluence point of the core yarn and the sheath section, resulting in a triple winding structure and unstable process.

In addition, the degree of orientation Δn of the thread that will eventually become the core is 15.
Using highly oriented undrawn yarn in the range of ~80X10-3,
It is desirable to draw at a low elongation of 40% or less of the same type of elongation and to use a false twisting device that has a yarn feeding effect. As a result, a processed yarn in which the core portion of the untwisted portion is partially fused at a lower heat setting temperature can be obtained.

Further, by performing a secondary setting after the false twisting process, it becomes possible to reduce the torque caused by the alternate twisting.

Furthermore, drapability can be improved by adding a stretch to the fabric immediately before winding it up to break the fusion bond.

Next, the manufacturing method of the present invention will be explained using the drawings.

FIG. 1 shows an embodiment of the present invention, in which two highly oriented polyester undrawn yarns A and B are supplied to a single three-axis circumscribed friction false twisting device 9 in a conventional false twisting machine. Two sets of first feed rollers 5.6 are provided, the feed rates of which can be adjusted independently of each other.

In FIG. 1, the polyester highly oriented undrawn yarn B (hereinafter referred to as highly oriented undrawn yarn B) which is released from the package 1 and will eventually become the core yarn is connected to the wire guide 3 and the first
The material is supplied to a three-axis circumscribed friction false twisting device 9 via a supply roller 5 .

On the other hand, the highly oriented undrawn polyester yarn A (hereinafter referred to as highly oriented undrawn yarn A) that is released from the puff cage 2 and will eventually become a sheath is fed at a high feeding rate by a separately prepared first supply roller 6. After being pulled out through the wire guide 4 so as to be larger than the oriented undrawn yarn B, it passes through the wire guide 7 and is set at an angle θ with respect to the running direction of the highly oriented undrawn yarn B.
The material is supplied to the three-axis circumscribed friction false twisting device 9.

In this way, highly oriented undrawn yarn A, respectively.

B is supplied individually, but the highly oriented undrawn yarn A starts false twisting at the twisting start point P by the twisting of the 3-axis circumscribed friction false twisting device 9, and the highly oriented undrawn yarn A becomes highly oriented. It is wrapped around the undrawn yarn B to form a single yarn. Next, the winding form in the heating area is thermally set by the first heater 8.

Next, after being untwisted, it is reheated by a second heater 1) disposed between the second supply roller 10 and the third supply roller 12, and then wound up into a winding package 13.

The false twisting device is not limited to the above-mentioned three-axis circumscribed friction false twisting device, but any type of device having a yarn feeding function can be used.

On the other hand, FIG. 2 shows another embodiment, in which the elongation of one supply system B' is higher than the elongation of the other supply system A', and a yarn length difference may occur between them. can be applied to In this example, the highly oriented undrawn polyester yarn A° which has passed through the wire guide 4 and the highly oriented undrawn polyester yarn B' which has passed through the wire guide 3 are aligned with each other and then passed through the wire guide 14 to the first supply roller. Supply to 5. The steps downstream from the first supply roller 5 are the same as those in the embodiment shown in FIG. 1, and therefore their explanation will be omitted.

FIG. 3 is a schematic diagram of an alternately twisted yarn manufactured by the manufacturing process shown in FIG. Untwisted portions 30 and overtwisted portions 31 are alternately present with irregular lengths in the length direction. Moreover, the core part 20a and the sheath part 21a in the untwisted part 30 have substantially the same twisting direction, and the core part 20b and the sheath part 21b in the over-untwisted part 31
The twist directions are also substantially the same. Further, the phase of the core portion 2Qa and the sheath portion 21a in the untwisted portion 30 are substantially the same, and the phase of the core portion 20b and the phase of the sheath portion 21b in the over-twisted portion 31 are substantially the same. It has become. Furthermore, as shown in FIG. 4, this alternately twisted composite processed yarn has a partially fused bond U between the single fibers constituting the core portion 20a in the untwisted portion.

〔Effect of the invention〕

As described above, the composite false twisted yarn of the present invention has untwisted portions and overtwisted portions alternately existing in the length direction of the yarn with irregular lengths, and the core portion in the untwisted portion is The sheath portion has substantially the same twist direction and twist density, and the core portion and the sheath portion in the over-twisted portion also have substantially the same twist direction and twist density, and constitute the core portion of the untwisted portion. Because the single fibers are partially fused, they pass through the weaving process well, and when woven into a fabric, it has a soft and crisp surface touch, and it is easy to iron. Occasionally, wrinkles occur, but in practice,
It won't become a problem.

On the other hand, in the production of the alternately twisted composite processed yarn of the present invention, the yarn that will eventually become the core and the yarn that will ultimately become the sheath are heated - heat-set - using a single false twisting device. When untwisting is applied to produce an alternately twisted yarn in which untwisted parts and over-untwisted parts exist alternately in the length direction of the yarn, the yarn that will eventually become the core part will eventually become the sheath part. Using a yarn that has lower elongation and a melting point 10°C or more lower than the yarn that will eventually become the sheath, the overfeed rate is 40℃.
% and within a range that does not cause back-and-forth vibration in the direction of travel at the yarn confluence point, and at least a portion of the single fibers of the yarn that will eventually become the core will fuse. Because the fabric is false-twisted at a heat-setting temperature such as Furthermore, ironing sometimes causes wrinkles, but in practical terms,
To inexpensively and efficiently produce alternately twisted composite textured yarn that is so light that it does not cause any problems. Furthermore, since there is no need to increase the heat fixation temperature to a particularly high temperature, power consumption can be reduced.

〔Example〕

Example 1 Highly oriented undrawn polyester yarn A (orientation degree 29.IXI 0-3), which will eventually become the sheath part, 96.3D/48F,
Polyester highly oriented undrawn yarn B (degree of orientation 32.8
X10-'), 123.1D/36F, elongation 161.
7%, melting point 238° C., was simultaneously stretched and false-twisted using the apparatus shown in FIG.

The false twisting conditions at this time are as follows. The highly oriented undrawn polyester yarn B is a highly oriented undrawn polyester yarn copolymerized with isophthalic acid, which has good heat resistance.

+1) Overfeed rate of first supply roller 6: Approximately 23% The overfeed rate of the first supply roller 6 is expressed by the following formula.

That is, ((VIA-VIB) /VIB) x 100 where 1^ is the surface speed of the first supply roller 6, and v and B are the surface speeds of the first supply roller 5.

(2) Processing speed: 300m/m1n (3) Stretching ratio (Vz / VtB): 1,
5, and (2) is the surface speed of the second supply roller 10.

(4) First heater temperature: 226°C (5) Second heater temperature = 200°C (6) False twisting device = 3-axis circumscribed friction false twisting device (6 rubber desks) (71D/Y ratio (false twisting Equipment surface speed/processing speed): 2.
5 (8) Reset feed rate: +3% [Evaluation] +1) ■Works ■value The processed yarn obtained at this time has a core-sheath structure in which yarn A is arranged in the sheath part and yarn B is arranged in the core part. (See Fig. 3), and had untwisted parts and overtwisted parts alternately having irregular lengths.

Further, the twist direction and twist density of the untwisted portion are substantially the same for the core yarn and the sheath portion, and the twist direction and twist density of the over-untwisted portion are substantially the same for the core yarn and the sheath portion. There was partial fusion (see Fig. 4) between the single fibers constituting the core in the untwisted part.

Furthermore, the actual fineness is 161 denier, the untwisted portion occupies 38% per meter, and the continuous average length of the g part is 23.
It was 6 mm. Furthermore, the difference in yarn length between the core yarn and the sheath is 3.
The twist density of the untwisted part was 2630 T/m, the twist density of the overtwisted part was 1612 T/m, the melting point of the core yarn was 238°C, and the melting point of the sheath part was 260°C.

(2) Fabric evaluation This processed yarn has a warp density of 65 wood/inch and a weft density of 55
When it was made into a plain weave of 1 inch per inch, it had a soft and crisp surface touch, and had a natural surface effect due to irregular pitch thickness unevenness.

It also had a cotton-like appearance and touch due to the high number of alternate twists. Furthermore, ironing sometimes resulted in wrinkles that were not a problem for practical use.

(3) "1 Good" JL1) Since it had alternating twists at a medium to strong twist level, it passed through the weaving process well.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the manufacturing process of the present invention, FIG. 2 is a schematic diagram showing an example of another manufacturing process of the present invention,
FIG. 3 is a schematic view of the alternately twisted composite textured yarn according to the present invention, and FIG. 4 is a sectional view of the untwisted portion. 1.1', 2.2'... Package, 5.6... First supply roller, 8... First heater, 9... False twisting device, 10... Second supply roller, 1)...second heater, 12...third supply roller, 13...winding package. Figure 3 Figure 4

Claims (7)

[Claims] (1) A composite false twisted yarn having a core-sheath structure, in which untwisted parts and overtwisted parts alternate in irregular lengths in the length direction of the yarn, and untwisted parts The core and sheath in the over-twisted part have substantially the same twist direction and twist density, and the core and sheath in the over-twisted part also have substantially the same twist direction and twist density, and the core in the untwisted part has substantially the same twist direction and twist density. An alternately twisted composite processed yarn with partial fusion between the constituent single fibers. (2) The alternately twisted composite processed yarn according to claim (1), wherein the yarn length difference between the yarn constituting the core portion and the yarn constituting the sheath portion is 20 to 50%. (3) The twist density of the untwisted part is 21,000/√D (T/m
) or more, the twist density of the over-twisted part is 9,000/√D (T/m
) or more, and the ratio of the average length of the untwisted portion to the entire length of the yarn is 20% or more, Claim (1)
The alternately twisted composite textured yarn described in item (2) or item (2). (4) The alternately twisted composite textured yarn according to claim 1, 2, or 3, wherein the melting point of the yarn constituting the core is lower than the melting point of the yarn constituting the sheath. . (5) The alternately twisted composite processed yarn according to claim 1, 2, 3, or 4, in which the single fibers constituting the sheath are thinner than the single fibers constituting the core. . (6) The yarn that will eventually become the core and the yarn that will eventually become the sheath are heated, heat-set, and untwisted using a single false-twisting device, and the yarn is twisted in the length direction of the yarn. When manufacturing an alternately twisted yarn in which untwisted portions and over-untwisted portions alternately exist, the yarn that will eventually become the core has a lower elongation than the yarn that will eventually become the sheath, and
Use yarn with a melting point 10°C or more lower, and overfeed the yarn that will eventually become the sheath within a 40% overfeed rate, and within a range that does not cause back-and-forth vibration in the direction of travel at the confluence of the yarns. Additionally, a method for producing an alternately twisted composite textured yarn, characterized in that false twisting is performed at a heat setting temperature such that at least a portion of the single fibers of the yarn that will eventually become the core fuse together. (7) The yarn that will eventually become the core has an orientation degree Δn of 15 to 80
A patent claim that is highly oriented undrawn yarn in the range of x10^-^3, drawn at a draw ratio of 40% or less of the elongation of the same type, and false-twisted using a false-twisting device that has a yarn feeding effect. A method for producing an alternately twisted composite textured yarn according to item (6).