JP2002030535A - Conjugate false twist covered elastic yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a conjugate false twist covered elastic yarn so as to provide a high level of softness without causing defective covering in a sheath part and to provide a method for producing the conjugate false twist covered yarn. SOLUTION: A polyamide multifilament false twisted crimped yarn 2 which is a raw yarn 2' for a sheath part is paralleled into a core/sheath form while drafting a polyurethane elastic yarn 1 that is a raw yarn 1' for a core part to carry out frictional type false twist texturing. The polyurethane elastic yarn 1 is used as the core part and the polyamide multifilament false twist crimped yarn 2 having at least twice false twist texturing histories as the sheath part is twisted and reversed to cover the periphery of the polyurethane elastic yarn 1. Thereby, a conjugate false twist covered elastic yarn Y having a yarn structure in which opened parts Y and entangled parts Ys are alternately formed in the yarn longitudinal direction and the number of the entangled parts Ys in the yarn longitudinal direction is 30-90 entangled parts Ys/18 cm is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite false twist-coated elastic yarn and a method for producing the same, and more particularly, to a composite false twist-coated elastic yarn having excellent softness and covering properties especially for pantyhose and tights. It relates to the manufacturing method.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 3-10739 (Patent No. 1)
No. 65949) uses a polyurethane elastic yarn as a core yarn, and a single fiber fineness of 1.5 d (1.7 dtex) or less around the core yarn.
A false twisted coated elastic yarn having a total fineness of 50 to 70 d (56 to 78 dtex) and a polyamide multifilament false twisted yarn having 40 to 68 filaments coated as a sheath yarn has been proposed. This false twist coated elastic yarn, pantyhose,
When used for applications such as tights, socks, and inners,
The knitted fabric had excellent characteristics of being able to give a soft texture and an appropriate fit.

However, in recent years, with the diversification of consumer preferences, tights and pantyhose having a more sophisticated soft feeling have been strongly demanded. As a method of obtaining such a high soft feeling from the false twist-coated elastic yarn, the single fiber fineness of the polyamide multifilament false twist yarn of the sheath portion is made finer than 1.5 d (1.7 dtex), and the number of filaments is 68. There is a way to do more than a book. However, if the single-fiber fineness of the sheath is further reduced or the number of filaments is increased, poor coating is likely to occur. And core breakage. Here, "blind" means that the false-dyed polyurethane elastic yarn looks white through the gap between the sheath yarn and the false twist-coated elastic yarn in the part where the knitted fabric has greatly extended, such as the knee part of the stocking. A phenomenon that can be seen.

Japanese Patent Application Laid-Open No. Sho 62-57959 discloses that
There has been proposed a method for producing a false-twisted coated elastic yarn in which a polyurethane elastic yarn and a polyamide false-twist yarn are aligned and subjected to an air swirling false-twisting process, followed by a confounding treatment. However, the false twist-coated elastic yarn obtained from this method has low sheath coatability,
There is a problem that the surface of the knitted fabric of the product is easily disturbed due to the problem that the product is likely to be non-uniform, so that "opening" tends to occur.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite false-twisted coated elastic yarn capable of obtaining a high degree of softness without causing poor coating on the sheath portion, and a method for producing the same. is there.

[0006]

According to the present invention, there is provided a composite false-twist-coated elastic yarn of the present invention, comprising a polyurethane elastic yarn as a core, and a sheath having a history of at least two times of false twisting as a sheath around the core. The multifilament false-twisted crimped yarn has a yarn structure in which twisted / inverted yarn is covered and alternately formed in the yarn length direction with an opening portion and an entangled portion. The number in the direction is 30 to 90 pieces / 18 cm.

The method for producing a composite false twist-coated elastic yarn of the present invention uses a polyurethane elastic yarn as a core raw yarn and a polyamide multifilament false twist crimped yarn which has been pre-twisted as a sheath raw yarn. While drafting the core raw yarn, the sheath raw yarn is aligned in a core / sheath shape, and the aligned yarn is subjected to frictional false twisting of twisting, heat fixing, and untwisting. Is what you do.

[0008] As described above, a sheath made of a polyurethane elastic yarn as a core portion, twisted and inverted around the core portion to cover the core portion,
Since a polyamide multifilament false-twisted crimped yarn having a history of at least two times of false twisting is used, a highly soft feeling can be exhibited when knitted, and the yarn length can be improved. In the direction, the opening part and the entangled part are formed alternately, and the entangled part is made a large number of 30 to 90 pieces / 18 cm. It is difficult to achieve a high degree of softness.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The composite false twist coated elastic yarn of the present invention comprises:
The drafted polyurethane elastic yarn and the false-twisted crimped yarn of polyamide multifilament preliminarily twisted are aligned in a core / sheath shape, and the aligned yarns are twisted, heat-set and untwisted. It can be manufactured by performing friction false twisting.

The composite false twist-coated elastic yarn thus obtained has a structure in which a polyamide multifilament false twisted crimped yarn is coated as a sheath around a polyurethane elastic yarn of a core portion. The false-twisted crimped yarn has a fine crimp due to at least two false-twisting histories of a false twisting process applied in advance as a sheath part original yarn and a subsequent complex false twisting process. Therefore, the knitted fabric gives a high degree of softness.

In the composite false twist-coated elastic yarn, the composite false twisting is performed by friction false twisting, so that an opening portion and an entangled portion are alternately formed in the yarn length direction, and the entangled portion is formed. 30 to
A large number of 90 pieces / 18 cm are provided.
By making the entangled portions densely present as described above, the covering property of the sheath portion is improved, so that the knitted fabric does not have peeling.

If the number of entangled portions is less than 30/18 cm, the sheath coatability is reduced. Therefore, when the knitted fabric is stretched greatly, the polyurethane elastic yarn of the core portion becomes the polyamide multifilament of the sheath portion. Looking through the gap of the false twisted crimped yarn,
You will be blind. Conversely, if the number of entangled parts is 90
If the number is more than 18 pieces / 18 cm, the covering property of the sheath portion is improved, but the texture when knitted fabric is hard, and the soft feeling is reduced. In addition, the surface quality of the knitted fabric is reduced.

In the composite false twisting process for producing the composite false twist coated elastic yarn of the present invention, the twist direction of the false twisting of the sheath part original yarn and the twist direction in the composite false twisting process are adjusted. The following effects can be obtained.

When the two twisting directions (the false twisting directions) are opposite to each other, the residual torque of the sheath raw yarn cancels the residual torque generated by the composite false twisting, and the residual yarn as the composite false twist coated elastic yarn. Since the number of twists of the torque is reduced, soft texture and bulkiness can be further improved. Conversely, when both twisting directions are set to the same direction, the residual torque of the sheath yarn is multiplied by the residual torque generated by the composite false twisting, and the residual torque of the composite false twist coated elastic yarn is increased to increase the number of twists. To improve the sheerness and further improve the texture of "smooth" feeling.

The residual torque twist number of the composite false-twisted elastic yarn obtained as described above is preferably in the range of 0 to 90 turns / 50 cm. In particular, as in the former, the twist direction of the sheath yarn and the composite false-twist coating elasticity The number of twists of the residual torque when the twist directions of the yarns are opposite to each other is 0 to 9 times / 50 cm, and the number of twists of the residual torque when the yarns are in the same direction as in the latter is 10 to 90 times / 50 c.
m is preferred.

The relationship between the temperature of the composite false twisting and the temperature of the false twisting applied to the sheath raw yarn in advance is preferably such that the composite false twisting temperature is set higher than the false twisting temperature of the sheath raw yarn. .
However, it is desirable to suppress the composite false twisting temperature to such an extent that the core and the sheath maintain a non-fused relationship, so that the softening of the texture is achieved and the stretch power of the core elastic yarn is not impaired. When knitted fabric is used, high fitting properties can be exhibited.

As a specific combination of temperatures, the composite false twisting temperature is preferably set to 140 to 175 ° C. The false twisting temperature of the sheath part yarn is preferably 90 ° C.
To 140 ° C, and 10 ° C higher than the composite false twisting temperature
It is preferable to set a lower value.

The composite false twist-coated elastic yarn of the present invention is preferably twisted or entangled after the composite false twisting, and the coatability can be further improved by the twisting or entanglement. The confounding may be performed by air pressure after the composite false twisting process and before winding the composite false twist coated elastic yarn around the cheese. In addition, the twisting can be performed after the composite false twist-coated elastic yarn is once wound around the cheese after the composite false twisting and then unwound.

In particular, the twisting does not form a knitted surface defect peculiar to the confounding treatment, so that the covering property can be advantageously improved without impairing the soft texture, and the knitting processing passability can be improved as well as the knitting processing passability. In addition, it is possible to give a luxury feeling to products such as tights and panty king. The twisting direction of the twisting is
The direction may be either S-twist or Z-twist. However, in general, when the direction is the same as the twisting direction (false twist direction) of the composite false-twisting process, the convergence and covering properties are improved. When the direction is reversed, the bulkiness and softness can be improved.

The number of ply twists varies depending on the fineness of the composite false twist-coated elastic yarn.
800 T / m, 50-30 for 100-200 dtex
Preferably, it is 0 T / m.

FIGS. 1A and 1B show an example of a composite false twist coated elastic yarn of the present invention. FIG. 1A shows a side view of the entire yarn, FIG. 1B shows a cross section taken along line 1B-1B 'in FIG. Shows the cross section 1C-1C 'in FIG.

As shown in FIG. 1, the composite false-twisted elastic yarn Y of the present invention has a polyurethane elastic yarn 1 at its core and a polyamide multifilament false-twisted crimped yarn 2 around the core. The yarn is covered so as to be turned and inverted, and the spread portion Yo and the entangled portion Ys are alternately formed in the yarn longitudinal direction.

The material of the polyamide multifilament false twisted crimped yarn 2 of the sheath is not particularly limited as long as it is polyamide, but nylon 6 or nylon 66 is preferably used.
The polyamide multifilament false twisted crimped yarn 2 has at least two false twisting histories as described later, and the crimp is refined from the two or more false twisting histories. Further, due to the fine crimp, a high degree of soft feeling can be exhibited when the knitted fabric of the product is obtained.

As shown in FIG. 1 (B), the opening portion Yo of the composite false twist-coated elastic yarn Y is formed by turning the polyamide multifilament false twist yarn 2 in the sheath portion into the opened state and replacing the polyurethane elastic yarn 1 in the core portion. Surrounding. On the other hand, in the entangled portion Ys, as shown in FIG. 1C, the polyamide multifilament false twisted crimped yarn 2 in the sheath portion is tightly entangled and covers the polyurethane elastic yarn 1 in the core portion. . In such a state that the spread portion Yo and the entangled portion Ys are alternately formed, the entangled portion Ys exists at a frequency of 30 to 90 pieces / 18 cm in the yarn longitudinal direction.

FIG. 2 shows an example of a process for producing the composite false twist-coated elastic yarn of the present invention.

P ₁ is a package in which a polyurethane elastic yarn 1 ′ as a core yarn is wound up, and is rotatably supported by a pair of rolling rollers 3. On the other hand, P ₂ is a polyamide multifilament false twisted crimped yarn 2 ′ of the sheath yarn.
And is supported by a bobbin holder (not shown) in a non-rotating state. The polyamide multifilament false twisted crimped yarn 2 'is a crimped yarn that has been subjected to false twisting in advance, and either an S twisted yarn or a Z twisted yarn is used.

The polyurethane elastic yarn 1 'is a package P ₁
And the other polyamide multifilament false twisted crimped yarn 2 ′ is unwound from the package P _{2 in the} bobbin axial direction while being drafted by the supply roller 5, and the polyurethane elastic yarn is wound in the V-shaped guide 4. 1 ′ is drawn into a core portion and the polyamide multifilament false twisted crimped yarn 2 ′ is drawn into a core-sheath shape so as to become a sheath portion.

The two yarns aligned as described above are twisted by the friction false twisting tool 7 while being pulled from the supply roller 5 by the take-up roller 8 rotating at a higher surface speed than the supply roller 5. After that, it is heat-set by the heater 6, cooled, and then untwisted by the friction false twisting device 7 to perform composite false twisting, thereby obtaining the composite false twist coated elastic yarn Y. The composite false twist coated elastic yarn Y thus manufactured is taken up by the winding roller 1.
1 may be wound directly as package P ₃ in, but before winding, may be entangled treated with compressed air by entangling nozzle 9 between the take-up roller 8 and the relaxation roller 10. Or without entangling treatment by entangling nozzle 9, once after they wound up as a package P ₃ to the take-up roller 11 may be twisted about the S-twist direction or Z-twist direction rewind the package P ₃ .

The twist direction (false twist direction) of the composite false twist coated elastic yarn Y may be the same as the twist direction (false twist direction) of the polyamide multifilament false twist crimped yarn 2, or may be in the opposite direction. It may be. When the twisting direction is the same, the number of twists of the residual torque of the composite false twist-coated elastic yarn Y increases, and the covering property is improved, the convergence property is increased, and the sheer property is obtained. Conversely, when the twisting direction is reversed, the number of twists of the residual torque of the composite false twist-coated elastic yarn Y decreases, and the openability increases, whereby the texture becomes soft and the volume feeling improves.

The composite false twist-coated elastic yarn of the present invention can be used for underwear such as pantyhose, tights, and socks, body suits, supporters, innerwear, T-shirts, sunshade supporters, bandages, corsets, and the like. It can be widely and suitably used for medical devices such as bandage replacement sheets, sports goods such as swimwear, leotards, golf, tennis, and ski wear, and knitted products and stretch woven products.

[0031]

EXAMPLES In the following Examples and Comparative Examples, the number of entangled portions and the number of residual torque twists of the composite false twist-coated elastic yarn were measured by the following methods.

[Measurement method of the number of entangled portions] A load of 13.7 cN is hung on the composite false twist coated elastic yarn, and marks are marked at both ends of a 30 cm interval (length) as a test length. This trial length is 4
0% (12 cm) to relax and fix both ends, read the number entangled per 18 cm of the coated elastic yarn with a magnifying glass,
The average value of n = 5 is defined as the number of entangled portions (times / 18 cm).

[Method of Measuring Twist Number of Residual Torque] A load of 13.7 cN is hung on the composite false twist coated elastic yarn, and a mark is made at both ends of an interval (length) of 1 m as a test length, and the sample is placed in the transverse direction. Fixed to. Next, at the center (50 cm) of the 1 m interval,
By suspending the load W ₁ of 0.392cN (0.4g), aligning the edges of the sample at the center, the sample is a number of twists residual torque rotational speed N until it stops rotating (times / 50 cm). If the composite false twist coated elastic yarn is left for a long time after the composite false twisting, the residual torque twist number tends to become latent,
It shall be treated with warm water at 60 ° C. and then measured.

Example 1 A polyurethane elastic yarn having a fineness of 22 dtex was pre-drafted 2.5 times at the time of unwinding, and a composite false twisting draft 1.16.
And a total draft of 2.9 times used for the core yarn, and a fineness of 89 dt which was false twisted at a temperature of 120 ° C.
ex, a nylon 6 multifilament false twisted crimped yarn having 52 filaments was used as the sheath yarn, and both yarns were aligned to obtain a D / Y ratio of 2.7, a yarn processing speed of 200 m / min, and a false twist of 3471 T. / M, set temperature 162 ° C, twisting tension 16
g, by performing false twisting with a twin-screw friction false twisting tool at an untwisting tension of 51 g to form a composite false twist-coated elastic yarn.
The confounding treatment was performed with 9MP (0.4 kg / cm ² ) air.

The obtained composite false twist coated elastic yarn has a fineness of 7
9.1 dtex, strength 4.04 cN / dtex (4.1
2g / d), elongation 30.2%, elasticity restoration rate (2 mg / d)
Under load) is 56.1%, and the fiber has alternately opened and entangled portions in the yarn longitudinal direction, and the number of entangled portions is 58 /
18 cm. The number of twists of the residual torque is 55 times / 5
0 cm. (Furthermore, the fineness, the high elongation, and the expansion / contraction restoration rate were measured according to JIS method L1013.)
The composite false twist-coated elastic yarn obtained as described above is subjected to 200 T / T in the same direction as the twisting direction (S) of the composite false twist-coated elastic yarn.
m, then 400 needles, 4 ports, 500 m / m
In knitting into stockings, this was further dyed black to produce tights.

When a tightness test was conducted on the tights, the knitted fabric had a soft texture without a feeling of tightening. It was presented with high-class tights.

Similarly, the composite false-twisted coated elastic yarn obtained as described above was subjected to an additional twist of 550 T / m in the direction (Z) opposite to the twisting direction (S) of the composite false-twisted coated elastic yarn. The so-called over-twisted yarn form of the real twist false twist coated elastic yarn was knitted into a stocking with 400 needles, and this was dyed black to produce tights. The texture of the knitted fabric was extremely soft, the stitches were smooth and beautiful, and the tights were voluminous and super-luxury.

Comparative Example 1 The procedure of Example 1 was repeated except that the raw sheath yarn was replaced with a nylon 6 multifilament raw silk having a fineness of 88 dtex and 52 filaments, and the heating temperature for the composite false twisting was changed to 165 ° C. Composite false twisting was performed under the same conditions to produce a composite false twist coated elastic yarn.

The obtained composite false twist-coated elastic yarn had alternately opened and entangled portions in the yarn longitudinal direction. The number of entangled portions was 1/18 cm. The coatability was low. The twist number of the residual torque was 128 pieces / 50 cm.

The composite false twist-coated elastic yarn was subjected to 200 T / m of additional twisting in the same direction as the twisting direction (S) of the composite false twist-coated elastic yarn in the same manner as in Example 1, and then 400 needles were used. 4 mouths, 5
It was knitted into stockings at 00 m / min, and this was further dyed black to produce tights. However, because of poor coverage, "blinking" occurred at the bent portion of the knee.

[0041]

As described above, according to the present invention, a polyurethane elastic yarn is used as a core, and a sheath having at least two false twisting histories is used as a sheath to be twisted and reversed around the core. The use of a polyamide multi-filament false twisted crimped yarn with fine shrinkage allows a high degree of softness to be obtained when knitting the fabric.Also, the open and entangled portions alternate in the yarn length direction. And the entangled portion is 30 to 90 pieces /
Because of the large size of 18 cm, the sheath portion has a high covering property, and when knitted, the sheath is hardly peeled off, and a high degree of soft feeling can be exhibited.

[Brief description of the drawings]

FIG. 1 shows an example of a composite false twist-coated elastic yarn of the present invention,
(A) is a side view of the whole yarn, (B) is 1B in (A).
-1B 'sectional drawing, (C) is the same as 1C- in (A).
It is 1C 'sectional drawing.

FIG. 2 is a process chart showing an example of a method for producing a composite false twist-coated elastic yarn of the present invention.

[Selection diagram]

DESCRIPTION OF SYMBOLS 1 Polyurethane elastic yarn 2 Polyamide multifilament false twisted crimped yarn Y Composite false twist coated elastic yarn Yo Spreading part Ys Entangled part 1 'Polyurethane elastic yarn (core original yarn) 2' Polyamide multifilament false twisted crimped yarn ( 4) V-shaped guide 5 Supply roller 6 Heater 7 Friction false twisting tool (twister) 8 Take-up roller 9 Entangling nozzle 11 Winding roller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tohru Takahashi 1-6-20 Dojima, Kita-ku, Osaka-shi, Osaka Toray Co., Ltd. Osaka Works (72) Inventor Yoshiyuki Miki 157- Kamimidai, Toyooka, Hyogo Prefecture 32 Shinshin Kogyo Co., Ltd. (72) Inventor Kei Inoue 1-7-31 Otemae, Chuo-ku, Osaka City, Osaka Prefecture F Term (reference) 4L002 AA05 AA06 AB02 AB04 AC01 DA04 EA06 FA05 4L036 MA06 MA33 MA39 PA07 PA46 RA25

Claims (8)

[Claims] 1. A polyurethane multifilament false twisted and crimped yarn having at least two false twisting histories as a sheath around a polyurethane elastic yarn as a sheath, twisted and inverted to coat the yarn, and a yarn length. A composite false twist-coated elastic yarn having a yarn structure in which opening portions and entangled portions are alternately formed in the width direction, and the number of the entangled portions in the yarn length direction is 30 to 90/18 cm. 2. The composite false twist coated elastic yarn according to claim 1, wherein the core and the sheath are in a non-fused state with each other. 3. The total fineness is less than 100 dtex,
The composite false twist-coated elastic yarn according to claim 1 or 2, wherein the elastic yarn is twisted at 100 to 800 T / m. 4. The composite false twist-coated elastic yarn according to claim 1, wherein the total fineness is 100 to 200 dtex and the twist is 50 to 300 T / m. 5. A core multi-filament false-twisted crimped yarn which has been pre-twisted as a core raw yarn and a polyurethane elastic yarn as a core raw yarn, and the core raw yarn is drafted. A method for producing a composite false-twisted coated elastic yarn in which yarns are aligned in a core / sheath shape, and the aligned yarns are subjected to friction type false twisting of twisting, heat setting, and untwisting. 6. The processing temperature for pre-twisting the polyamide multifilament false-twisted crimped yarn is 90 to 14.
The method for producing a composite false twist coated elastic yarn according to claim 5, wherein the processing temperature at 0 ° C and the composite false twisting of both yarns is 140 to 175 ° C. 7. The method for producing a composite false twist coated elastic yarn according to claim 6, wherein the yarn after the composite false twisting is subjected to entanglement treatment by pressurized air. 8. The method for producing a composite false twist coated elastic yarn according to claim 6, wherein the twisted yarn after the composite false twisting is subjected to additional twisting.