JP2813525B2 - False twist composite yarn and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composite yarn comprising at least two thermoplastic synthetic fiber multifilament yarns. More specifically, the present invention relates to a novel false-twisted composite yarn in which at least two stretched thermoplastic synthetic fiber multifilament yarns are entangled with a semi-drawn yarn to improve feeling and dyeability, and a method for producing the same.

[0002]

2. Description of the Related Art It has been known to produce a yarn having a spun yarn-like appearance and bulkiness using a thermoplastic synthetic fiber multifilament yarn by a false twisting method.
As a representative example, Japanese Patent Publication No. 60-7050,
JP-B-60-11130 is an example. In each of the false twisted composite yarns obtained by these production methods, yarns having different elongations of semi-drawn yarns are aligned, subjected to simultaneous drawing false twisting, and the sheath yarn is wound alternately around the core yarn. It is intended to give a spun yarn-like appearance by attaching. The false twisted composite yarn thus obtained is characterized by a spun yarn-like appearance, a relatively large bulkiness and a deep color.

In Japanese Patent Publication No. 57-38696, immediately after preliminarily drawing a semi-drawn polyester yarn, the yarn is false-twisted with other yarns at the same time to produce composite yarns of various heather patterns. It is disclosed. The composite textured yarn shown here is obtained by stretching a semi-stretched yarn of polyester under predetermined stretching conditions and immediately false-twisting with other yarns,
Due to the difference in dyeing based on the difference in physical properties between the two yarns, a composite yarn having a heather yarn tone can be obtained.

[0004]

However, the conventional Japanese Patent Publication No. Sho 60-7050 and Japanese Patent Publication No. Sho 60-11130 have been disclosed.
The invention of Japanese Patent Publication No.
There is a problem that woven or knitted fabrics using these yarns can be obtained only in a soft and rigid form.

In the invention disclosed in Japanese Patent Publication No. 57-38669, a yarn length difference occurs between the two, and the yarn is rubbed by a yarn path guide or a traverse guide, or is affected by airflow generated by a yarn or other causes. The running yarn is slackened, and this is squeezed to form a knot, the slack portion is caught, and fly cotton is sucked in, causing more feathers and causing yarn breakage. There is a problem that operability is significantly reduced.

In order to solve the above-mentioned problems of the prior art, the present invention provides a composite yarn having a soft, firm, stiff, and worsted-like natural feeling, and a manufacturing method excellent in processing operability. With the goal.

[0007]

In order to achieve the above object, the false twisted composite yarn of the present invention has at least one yarn completely completed.
30% of the natural drawing ratio of the semi-drawn yarn
It is stretched evenly to the extent that no unevenness of 70%
A composite yarn comprising at least two thermoplastic synthetic fiber multifilament yarns using a twisted yarn, wherein each of the single fibers constituting the composite yarn has a false twist crimp,
The composite yarn has at least 20 entangled portions / m, and a difference in yarn length between a plurality of multifilament yarns constituting the composite yarn is 15% to 30%. The undrawn yarn or semi-drawn yarn has a relatively coarse crimp, has a relatively long crimp length, and has a relatively short crimp length. It is characterized by being present on the outer side of the composite yarn.

In the above structure, the composite yarn preferably has at least 30 entangled portions / m. Further, the method for producing a false twist composite yarn of the present invention is characterized in that at least one yarn is
A fully drawn yarn and the other is a supply yarn composed of at least two thermoplastic synthetic fiber multifilament yarns using a semi-drawn yarn, and the at least two yarns are aligned and temporarily In the method for producing a false twisted composite yarn by supplying the half-drawn yarn to a twisting region, the half-drawn yarn is subjected to hot drawing to a natural drawing ratio of 3%.
In the range of 0% to 70%, the uniform
The composite yarn is drawn at a rate of at least 30 yarns / m by fluid treatment while being aligned with the fully drawn yarn, and then false twisted at an overfeed rate of 0% to -10%. The difference in yarn length between a plurality of constituent multifilament yarns is 15 to 30%, and the fully drawn yarn has a relatively small crimp and a short yarn length, and is relatively close to the center of the composite yarn. The undrawn yarn or the semi-drawn yarn has a relatively coarse crimp, a long yarn length, and is obtained as a false twisted composite yarn present relatively outside the composite yarn.

In the above configuration, it is preferable to impart at least 50 entangles / m by fluid treatment.

[0010]

According to the structure of the present invention, each of the single fibers constituting the composite yarn has a false twist crimp, and the composite yarn has at least 20 entangled portions / m. Moreover, since the yarn length difference between the plurality of multifilament yarns constituting the composite yarn is 15 to 30%, the composite yarn can be made soft, firm, stiff, and has a natural feeling of worsting. . If the number of entanglements of the composite yarn is 30 / m, the yarn becomes more stable and easy to use.

According to the structure of the production method of the present invention, the undrawn yarn or the semi-drawn yarn is continuously drawn within the range of 30 to 70% of the natural drawing ratio, and subsequently, is drawn together with the fully drawn yarn to perform fluid treatment. To give at least 30 entanglements / m,
Next, by performing false twisting in an overfeed rate of 0% to -10%, a production method excellent in processing operability can be obtained. Note that at least 50
When the number of entanglements per unit is given, the number of entanglements of the composite yarn of the final product becomes 20 or more, more preferably 30 or more, and thus it is preferable.

[0012]

The present invention will be described more specifically with reference to the following examples. FIG. 1 is a schematic view showing the appearance of a false twist composite yarn according to an example of the present invention.

As shown in FIG. 1, in the false twist composite yarn 1 according to the present embodiment, a yarn 2 having a short yarn length and a yarn 3 having a long yarn length are integrally connected via an interlacing point 4. Each of the single fibers constituting the short yarn 2 and the long yarn 3 has a spiral crimp due to false twist, and the former is fine and the latter is coarse. This will be described in connection with a manufacturing method described later.

The false twist composite yarn of this embodiment has a yarn length of 15 to 30% based on the shorter yarn length. The reason why the yarn having the yarn length difference maintains the yarn form as one composite yarn is that the individual filaments constituting the composite yarn are entangled with each other. If the number of entanglements is too large, the bulkiness of the composite yarn is not obtained, and if the number of entanglements is less than a certain value, it is easy to partially separate into individual yarns constituting the composite yarn, and neps and slabs are formed. More likely to occur. This not only significantly reduces the properties of the yarn, but also causes the yarn to break, resulting in reduced operability. Therefore, the number of confounds is preferably in the range of 30 / m to 150 / m. Of course, the number of entanglements varies depending on the type of fabric to be manufactured using this composite yarn and the twisting, and may be appropriately determined in consideration of these requirements.

Next, the yarn length difference of the yarns constituting the composite yarn is:
It affects the properties of the fabric to be produced, such as bulkiness, tactile sensation, and lumping. How much difference in yarn length is required depends on the type of fabric to be manufactured and required characteristics, but a yarn having a difference in the range of 15 to 30% based on a yarn having a short yarn length is used.

Various types of thermoplastic synthetic fiber multifilament yarns used in the present embodiment are used. When used for clothing, it is necessary that composite yarns can be easily produced and dyed easily. . As a material satisfying these requirements, a polyester-based polyamide-based material or a thermoplastic synthetic fiber multifilament yarn in which these materials are mixed and used can be appropriately used. Among them, polyester-based synthetic fiber multifilament yarn is particularly preferably used.

Next, a method for producing a false twist composite yarn according to the present invention will be described. FIG. 2 is a schematic view showing an apparatus for manufacturing a false twist composite yarn according to the present embodiment. This manufacturing apparatus includes a stretching section 5 and a false twist section 6. The stretching section 5 is the first
It comprises feed rollers 7 and 7 ′, a heat fixing device 8 and stretching rollers 9 and 9 ′, and the false twist section 6 includes second feed rollers 10 and 10 ′, a heater 11, a false twist element 12, a delivery roller 13, 13 'is a main part. Then, the composite yarn obtained by the winding device 14 is wound around a package 17. The heat fixing device 8 includes a hot pin,
Either of the heater non-contact heating method may be used.

The thermoplastic synthetic fiber multifilament semi-drawn yarn A sent from the first feed rollers 7 and 7 'is drawn under predetermined conditions by a heat fixing device 8 and drawing rollers 9 and 9'. Heat fixing device 8 and stretching rollers 9, 9 '
(Including partially oriented yarn) A
Is supplied to the second feed rollers 10 and 10 ′ of the false twisting section 6 via the entanglement nozzle 15.

On the other hand, in a state in which the thermoplastic synthetic fiber multifilament fully drawn yarn B is drawn and aligned with the semi-drawn yarn A by the drawing rollers 9, 9 'via a yarn guide 16 provided upstream of the drawing rollers 9, 9'. It is supplied to the second feed rollers 10 and 10 ′ via the entanglement nozzle 15. As described above, the drawn semi-drawn yarn A and the fully drawn yarn B pass through the entanglement nozzle 15 to form an entangled composite yarn in which the two are integrally joined by entanglement, so that the second feed rollers 10, 10. '.

The entangled composite yarn that has passed through the second feed rollers 10 and 10 ′ is false-twisted by the twisting section 6, sent out from the delivery rollers 13 and 13 ′ as the false-twisted composite yarn 1, and taken up by the winding device 14. Is wound up on the package 17. Although not shown, a pair of nip rollers is provided between the delivery rollers 13, 13 'and the winding device 14 in FIG.
It is also possible to provide a confounding nozzle between the third and third ′ s and apply a post-confounding.

As shown in FIG. 1, the false twist composite yarn of the present embodiment has a difference in yarn length between constituent fillet yarns. This difference in the yarn length is determined by the natural drawing ratio of the semi-drawn yarn, the drawing conditions in the drawing part shown in FIG. 2, and the false twisting conditions in the false twist part. That is, the larger the residual elongation of the semi-drawn yarn, the larger the yarn length difference of the false twist composite yarn. This is because, as shown in FIG. 2, the entangled composite yarn that is false-twisted in the false twist portion has a tension determined by the ratio of the surface speed of the second feed rollers 10, 10 ′ to the surface speed of the delivery rollers 13, 13 ′. Alternatively, false twisting is performed in a relaxed state. However, the ratio between the second feed rollers 10 and 10 'and the delivery rollers 13 and 13' can be slightly changed depending on the heater temperature and the number of false twists, but is determined to be substantially constant by the elongation of the fully drawn yarn B. , Can not be changed greatly. Tolerable conditions that can be changed are in the range of at most -10% to + 10%.

On the other hand, the semi-drawn yarn supplied from the first feed roller is drawn within a range of 30 to 70% of its natural drawing ratio. Therefore, when both yarns are fed to the false twisting section after being entangled, the fully stretched yarn having low elongation is difficult to elongate even if tensioned. Will be located in the center.

On the other hand, the stretched semi-stretched yarn has a larger elongation than the fully stretched yarn when it is strained, so that it is easily stretched. Therefore, in the strong twisting state in the false twisting and twisting region, it is located relatively outside the yarn. Therefore, in the strongly twisted state, the individual filaments constituting the stretched semi-drawn yarn draw a spiral with a larger diameter than the individual filaments constituting the fully drawn yarn. As a result of the heat treatment in this state, the fully drawn yarn becomes a yarn 2 composed of individual filaments having relatively small crimps and a short yarn length as shown in FIG. The yarn composed of yarn has a relatively coarse crimp, and becomes the yarn 3 composed of individual filaments having a long yarn length. These yarns remain unentangled imparted by the entanglement nozzle 15 without disappearing even after the false twisting process, and thus form a false twisted composite yarn integrally joined. As described above, the fully drawn yarn 2 exists at the center of the composite yarn, and the yarn made of the semi-drawn yarn as a raw material exists in a state of being covered on the outside of the composite yarn.

If there is no binding due to this entanglement, there is a difference in yarn length between the two, so that the longer one is loosened and separated as a result of friction from guides and traverse guides, the surrounding airflow, etc. Slabs or thread breakage, which significantly lowers product quality. Therefore, the false twist composite yarn according to the present embodiment requires at least 20 entanglements / m. Next, if the false twist condition is kept constant, the yarn length difference changes depending on the drawing condition of the semi-drawn yarn, particularly the residual elongation. It can be easily understood in the above description that the difference in yarn length is more likely to occur as the amount of residual drawn yarn increases. Therefore, the stretching may be performed under conditions that provide a desired yarn length difference, and these conditions can be determined in advance by experiments.

FIG. 2 shows an embodiment in which a hot pin is used in the extending portion. The stretching is carried out under conditions suitable for the type of fabric to be manufactured and the intended use, but the stretched portion stretches about 30% to 70% of the natural stretch ratio of the semi-drawn yarn, and then stretches in the false twist area. Leave room. The hot pins are used for heating and hot stretching. The temperature of the hot pin can be set arbitrarily. Heating is not limited to hot pins, hot plate, saddle type,
It may be a heater such as a tube. Stretching should be performed so that stretching unevenness does not occur as much as possible. If stretch unevenness occurs, unevenness of the pattern may occur when dyeing. In order to reduce or eliminate the unevenness of the kasuri, it is preferable to perform hot stretching.

The material, blend ratio, fineness and number of filaments of the fully drawn yarn and the semi-drawn yarn used in the present embodiment are appropriately selected depending on the properties of the fabric to be produced, the use and the like. In this case, a yarn having a short yarn length, that is, a fully drawn yarn mainly contributes to mechanical properties such as the strength of the false twisted composite yarn, and a yarn having a long yarn length, that is, a yarn made from a semi-drawn yarn, is used as a raw material for fabric. Tactile sensation,
Since it greatly contributes to functional characteristics such as waist, surface roughness, and tint, it is determined in consideration of these points.

On the other hand, the false twist composite yarn according to the present embodiment is composed of at least two types of yarns having different properties, and the dyeability of both yarns does not always match. Therefore, inevitably, the unevenness of the pattern due to the difference in the dyeability between the two tends to occur. By increasing the number of confounds, these dyeing unevenness can be finely dispersed, but it is difficult to completely eliminate them.
Therefore, when the dyeing unevenness is a fatal defect, it can be solved by twist-twisting to form a two-layer structure in which a long yarn covers the yarn surface. In this case, however, the bulkiness of the yarn must be somewhat sacrificed.

Hereinafter, specific embodiments will be described. Example 1 A 125-denier 36-filament polyethylene terephthalate partially oriented yarn (POY) wound at a spinning speed of 3,000 m / min and a polyethylene terephthalate drawn yarn 75-denier 18 filament were processed using the apparatus shown in FIG. The main processing conditions are as follows. (1) Length of the heat fixing device 11: 2 m (2) Temperature of the heat fixing device 11: 200 ° C. (3) False twisting device 12: Eight urethane rubbers are mounted on a triaxial external friction type false twisting device (for a disk). Circumferential speed / yarn speed = 2:
1) (4) Pre-stretch ratio: 1.3 times (5) Pre-entanglement feed rate: + 2% (6) Number of false twists 2700 T / M (7) Processing speed: 300 m / min (8) Tension ratio of friction false twist : T ₂ / T ₁ = 0.6 (9) Post-entanglement treatment: Yes In the above, the number of pre-entanglements was 43 / m on average.

The composite yarn obtained under the above conditions has an average of 12
It had a number of entanglements of 1 / m, and the difference in yarn length between the two types of filaments was 21%, which was rich in bulkiness. When this yarn was twisted at 1500 T / M and evaluated with a woven fabric,
A good woven fabric with a soft, firm, waisted hand texture was obtained. In addition, the passability from yarn processing to fabric processing was good, and the workability was excellent.

Example 2 A 125-denier 36-filament polyethylene terephthalate partially oriented yarn (POY) wound at a spinning speed of 3,000 m / min and a polyethylene terephthalate drawn yarn 75-denier 18 filament were variously prepared using the apparatus shown in FIG. Processing was performed under different conditions (post-entanglement processing: available).
In the above, the number of pre-entanglement was 43 / m on average, and the obtained composite yarn had an average of 23 / m to 146 / m on average.

The processed yarn was twisted at 1500 T / M and evaluated with a woven fabric. Table 1 shows conditions and results relating to the stretching ratio and the feeling, and Table 2 shows conditions and results relating to the yarn length difference and the feeling.

[0032]

[Table 1]

[0033]

[Table 2]

As described above, the draw ratio was preferably 30 to 70%, and the difference in yarn length was excellent in the range of 15 to 27%.

[0035]

As described above, according to the present invention, each of the individual fibers constituting the composite yarn has a false twist crimp and has at least 20 entanglements / m. In addition, since the multifilament yarn constituting the composite yarn has a yarn length difference of 15 to 30%, the composite yarn can be soft, firm, stiff, and have a natural feeling of worsting.

According to the production method of the present invention, at least 30 undrawn yarns or semi-drawn yarns are continuously drawn at a natural drawing ratio of 30 to 70%, and are subsequently aligned with the completely drawn yarns by fluid treatment. / M after confounding,
By performing false twisting at an overfeed rate of 0% to -10%, a production method excellent in processing operability can be obtained.

[Brief description of the drawings]

FIG. 1 is an external view of a false twist composite yarn according to one embodiment of the present invention.

FIG. 2 is a schematic view of a manufacturing process according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 False twist composite yarn 2 Short yarn length 3 Long yarn length 4 Interlace point 5 Stretching part 6 False twisting part 7, 7 'First feed roller 8 Heat fixing device 9, 9' Stretching roller 10, 10 ' 2 feed roller 11 heater 12 false twist element 13, 13 'delivery roller 14 winding device 15 entanglement nozzle 16 yarn guide 17 package A semi-drawn yarn (partially oriented yarn: POY) B fully drawn yarn

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuki Furusawa 1-1-1, Kamiyake, Heiwa-cho, Nakajima-gun, Aichi Prefecture Toray Textile Co., Ltd. Headquarters Tokai Office (56) References JP-A-4-202821 (JP, A) JP-A-63-182430 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) D02G 1/00-3/46 D02J 1/22 D03D 15/00

Claims (2)

(57) [Claims] At least one yarn is a fully drawn yarn.
The other is 30% to 70% of the natural drawing ratio of the half drawn yarn.
A composite yarn composed of at least two thermoplastic synthetic fiber multifilament yarns using a yarn uniformly drawn to such an extent that color unevenness does not occur , wherein the single fiber constituting the composite yarn is Each of the composite yarns has a false twist crimp, and the composite yarn has at least 20 entangled portions / m, and the yarn length difference of a plurality of multifilament yarns constituting the composite yarn is 15 to 30%, and the fully drawn yarn has a relatively fine crimp and a short yarn length, and is relatively present at the center of the composite yarn. The undrawn or semi-drawn yarn is relatively coarse A false twist composite yarn characterized by being crimped, having a long yarn length, and being relatively present outside the composite yarn. 2. At least one yarn is a fully drawn yarn.
And at least two thermoplastic fibers using semi-drawn yarn
Using a supply yarn made of a synthetic fiber multifilament yarn, the method of producing a false twisted composite yarn by aligning the at least two yarns and supplying the yarn to a false twisting region.
30% to 70% of the natural drawing ratio of the semi-drawn yarn by hot drawing
The yarn is uniformly drawn to such an extent that unevenness of dyed pattern is not generated in the range, and subsequently, the yarn is drawn together with the fully drawn yarn to give a confound of at least 30 yarns / m by fluid treatment. Then, the overfeed rate is in the range of 0% to -10 %. False twisting is performed to reduce the yarn length difference between the plurality of multifilament yarns constituting the composite yarn to 15 to 30%, and the fully drawn yarn has a relatively fine crimp and a short yarn length. The untwisted yarn or semi-drawn yarn has a relatively coarse crimp, has a relatively long yarn length, and is relatively located at the center of the composite yarn. A method for producing a false twist composite yarn, comprising obtaining a yarn.