JP2001288634A - Composite covered elastic yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composite covered elastic yarn not causing the phenomenon of exposure of core yarn and to provide a method for producing the same. SOLUTION: This composite covered elastic yarn Z is composed of a yarn structure obtained by covering the circumference of an elastic yarn of a core yarn with a multifilament false twist yarn 2 of a sheath yarn in a substantially twistless manner to constitute a false twist covered elastic yarn Y of twistless coating structure and winding the circumference of the false twist coated elastic yarn Y with a filament yarn or a stable fiber yarn by twisting. The elastic yarn is arranged in parallel with the multifilament yarn and subjected false twisting to produce the false twist coated elastic yarn and the circumference of the false twist coated elastic yarn is wound with the filament yarn or the stable fiber yarn by a covering processing or a doubling processing to give the objective composite covered elastic yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite-coated elastic yarn and a method for producing the same, and more particularly, to a composite in which core yarn is hardly exposed at a bent portion such as a knee when knitted in tights or the like. The present invention relates to a coated elastic yarn and a method for producing the same.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 3-10739 (Patent No. 1)
No. 65949) discloses a false twist-coated elastic yarn having a non-twist coating structure in which a polyurethane elastic yarn is used as a core yarn and a polyamide multifilament false-twist yarn is coated around the core yarn substantially without twist. Since the false twist coated elastic yarn has a soft feeling, it is used for applications such as tights and pantyhose, and has been highly evaluated by consumers.

However, in products such as tights and pantyhose knitted using the above-described false twist-coated elastic yarn, the false-twist-coated elastic yarn repeatedly receives a larger expansion / contraction load than at other portions, particularly at a bent portion such as a knee. As a result, the elastic yarn of the core yarn was exposed between the polyamide multifilament false-twist yarns of the sheath yarn, so that a phenomenon called so-called “peeling” was easily caused. That is, since the polyurethane elastic yarn of the core yarn is less likely to be dyed by the dye than the polyamide yarn of the sheath yarn, it is dyed in a lighter color than the sheath yarn. For this reason, in the portion where the blinding has occurred as described above, the light-colored state of the blinding portion appears as a streak and becomes conspicuous.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a composite-coated elastic yarn which does not cause dipping in which the core yarn is exposed, and a method for producing the same.

[0005]

The composite coated elastic yarn of the present invention which achieves the above object has a non-twisted coating structure in which a multifilament false-twisted sheath yarn is coated substantially non-twisted around an elastic yarn of a core yarn. , And has a yarn structure in which a long fiber yarn or a short fiber yarn is wound around the false twist coated elastic yarn by real twist.

[0006] As described above, the long fiber yarn or the short fiber yarn is wound around the false twist coated elastic yarn composed of the core yarn elastic yarn and the sheath yarn multifilament false twist yarn by real twist. It becomes difficult for the core yarn to be exposed to the outside of the sheath yarn, and it becomes difficult to cause peeling. In addition, by appropriately selecting the characteristics of the long fiber yarn or the short fiber yarn wound around the outside, the knitted fabric knitted from this composite coated elastic yarn can be soft-touched, spun like, glossy, highly hygroscopic, and colored. A new feeling or function such as can be provided.

In the method for producing a composite coated elastic yarn according to the present invention, the elastic yarn and the multifilament yarn are aligned and false twisted to produce a false twist coated elastic yarn. The method is characterized in that a long fiber yarn or a short fiber yarn is wound by covering processing or ply twist processing.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The composite coated elastic yarn of the present invention is mainly composed of a false twist coated elastic yarn, and the false twist coated elastic yarn is a core yarn made of an elastic yarn and a multifilament false twisted yarn on the outer periphery. It has a non-twist coating structure in which the sheath yarn is twisted / reversed and coated with substantially no twist. The elastic yarn used for the core yarn is not particularly limited, but for example, a polyurethane-based elastic yarn, a polyate-based elastic yarn, or the like is preferably used. The multifilament false twist yarn used for the sheath yarn is not particularly limited as long as it is a synthetic fiber that can be false twisted. For example, a false twist yarn made of a polyamide multifilament, a polyester multifilament, or the like is preferably used.

The composite coated elastic yarn of the present invention is formed by winding a long fiber yarn or a short fiber yarn around the above false twist coated elastic yarn by real twist. As described above, since the long fiber yarn or the short fiber yarn is wound around the outer periphery by the real twist, even if the fiber yarn is excessively expanded and contracted, the core yarn of the false twist coated elastic yarn is exposed to the outside. Can be suppressed.

[0010] The type of yarn used for the long fiber yarn or the short fiber yarn is not particularly limited, but a new feeling or function can be provided by selecting the yarn. It is good to select in consideration of the factors to be performed.
For example, in the case of long fiber yarns, polyamide filament processed yarn, polyester filament processed yarn, silk yarn, acetate yarn, rayon yarn and the like can be mentioned. A polyamide filament processed yarn or polyester filament processed yarn can give softness or a feeling of smoothness, a silk yarn can give gloss, hygroscopicity, suppleness, etc., and an acetate yarn or rayon yarn can give coloration and dryness.

In the case of short fiber yarns, cotton spun yarn, acetate spun yarn, rayon spun yarn, wool yarn and the like can be mentioned. In the case of yarn or rayon spun yarn, it is possible to give coloring properties and dry feeling, and in the case of wool yarn, it is possible to give firmness, waist, heat retention and the like.

FIGS. 1 and 2 are side views respectively exemplifying the composite coated elastic yarn of the present invention.

In each case, the composite-coated elastic yarn Z has a false-twist-coated elastic yarn Y disposed at the center thereof and a wound yarn X composed of a long-fiber yarn or a short-fiber yarn surrounded by a real twist. It is spirally wound. The composite coated elastic yarn Z of FIG. 1 shows a case where the wound yarn X is formed by the twisting process, and the composite coated elastic yarn Z of FIG. 2 has the wound yarn X formed by the covering process. Is the case.

In the above-mentioned composite coated elastic yarn, the false twist-coated elastic yarn Y at the center is formed by twisting and reversing along the longitudinal direction a multifilament false-twisted yarn 2 around the elastic yarn 1 as a core yarn and a sheath yarn around the outer periphery. It has a non-twist coating structure that is coated with no twist. As the elastic yarn 1, polyurethane elastic yarn, polyether elastic yarn, or the like is used, and one or two yarns are arranged. Of course, a larger number may be arranged. The multifilament false twist yarn 2 is made of synthetic fibers such as polyamide and polyester. Among them, polyamide is preferably nylon 6 or nylon 66, and polyester is preferably polyethylene terephthalate.

The wound yarn X may be either a long fiber yarn or a short fiber yarn. As described above, in the case of long fiber yarn, polyamide filament processed yarn, polyester filament processed yarn, silk yarn, acetate yarn, rayon yarn and the like are preferable, and in the case of short fiber yarn, cotton spun yarn,
Acetate spun yarn, rayon spun yarn, wool yarn and the like are preferably used.

The above-described composite coated elastic yarn of the present invention comprises a first step of drafting an elastic yarn, aligning a multifilament yarn with the yarn, and performing false twisting to produce a false twist coated elastic yarn. It can be manufactured by a combination of the second step of covering, knitting or design twisting the long fiber yarn and the short fiber yarn on the twist-coated elastic yarn. The false twisting is preferably performed by a friction false twist. As a twister used for the friction false twist, a biaxial disc type twister or a triaxial disc type twister is preferably used.

In the false twist-coated elastic yarn produced in the first step,
It is preferable to perform a confounding process with compressed air before winding. By giving the false twist-coated elastic yarn entangled in this manner, the occurrence rate of peeling can be further reduced. More preferably, the number of winding yarns (long fiber yarns or short fiber yarns) to be wound in the second step may be one, but if a double covering type for supplying two yarns is used, The peeling rate can be further reduced.

It is preferable that the direction of the false twist given in the first step and the direction of the covering or ply twist given in the second step be opposite to each other. By setting the twist directions to be opposite to each other, the stretchability and bulkiness of the composite coated elastic yarn can be improved. Specifically, if the twist direction of the false twist given in the first step is S, the covering area given in the second step, the twist direction of the ply or design twist yarn is Z, and the twist direction of the false twist is If Z, the covering area is preferably S.

FIG. 3 illustrates a first step of producing a false twist-coated elastic yarn.

Reference numeral 3 denotes a package around which a polyurethane elastic yarn 1 for the core original yarn is wound, and is rotatably supported by a pair of rolling rollers 5. While the polyurethane elastic yarn 1 is drafted from the package 3, the polyurethane elastic yarn 1 is unwound in the lateral direction by the supply roller 7. On the other hand, reference numeral 4 denotes a package in which a polyamide multifilament yarn 2 'for the sheath part original yarn is wound, and is supported by a support stem (not shown). The polyamide multifilament yarn 2 ′ is pulled out from the package 4 by the supply roller 7, and is aligned with the polyurethane elastic yarn 1 being drafted via the convergence guide 6 as described above.

The combined polyurethane elastic yarn 1 and polyamide multifilament yarn 2 'are drawn from the supply roller 7 to a take-up roller 8 whose peripheral speed is slightly higher than that of the supply roller 7, and move between the two rollers. The frictional false twist is performed by the disk type twister 10 therebetween. In the disk type twister 10, twisting of twist is given, and after passing through the twister 10, it is untwisted. The twist twisted on the upstream side is heat set and cooled by the heater 9 and untwisted into a false twist coated elastic yarn Y. Before being wound on the cheese 13, the false-twisted coated elastic yarn Y is treated with compressed air under a relaxed condition by passing through a tangling nozzle 12 between the take-up roller 8 and the transport roller 11, and the polyamide multi-layer outer layer is formed. Entangling is applied to the filament false twist yarn 2. Note that the cheese 13 may be directly wound up from the take-off roller 8 and then may be subjected to a twisting process.

FIG. 4 illustrates a second step in the case where the false twist-coated elastic yarn Y obtained in the first step is covered with a long fiber thread or a short fiber thread.

The cheese 13 around which the false twist covering elastic yarn Y is wound is rotatably supported by a pair of rolling rollers 14, and the supply roller 15 draws the false twist covering elastic yarn Y. On the other hand, the cheese 16 on which the winding yarn X of the long fiber yarn or the short fiber yarn is wound is supported by the hollow spindle 17, and is drawn out in the axial direction while being driven to rotate.

The false twist coated elastic yarn Y drawn out by the supply roller 15 travels so as to be drawn by the take-up roller 18 at a constant speed so as to pass through the axis of the hollow spindle 17. While running as described above, the composite coated elastic yarn Z is wound on the false twist coated elastic yarn Y having passed through the hollow spindle 17 so that the wound yarn X is unwound from the cheese 16 while being unwound. Is formed and wound up on the cheese 19. In the above process, the rolling roller 14 is not used, and the supply roller 1 is removed while removing the vertical length of the cheese 13.
5 may be supplied.

FIG. 5 illustrates a second step in the case where a long fiber yarn or a short fiber yarn is twisted on the false twist coated elastic yarn Y.

As in the case of FIG. 4, the cheese 13 around which the false twist coated elastic yarn Y is wound is rotatably supported by a pair of rolling rollers 14, and the false twist coated elastic yarn Y is drawn out by the supply roller 20. It is supposed to be. In addition, the cheese 16 ′ in which the winding yarn X of the long fiber yarn or the short fiber yarn is wound,
The supply roller 2 is supported by a support rod (not shown) in a stationary state.
0 allows it to be pulled out through the guide 21 in the axial direction.

Next, the false-twisted coated elastic yarn Y and the wrapped yarn X, which have been aligned and twined on the supply roller 20, are supplied to the ring twisting machine 22 and are compounded while being twisted by the ring twisting machine 22. The coated elastic yarn Z is formed and cheese 23 is wound up.

It is also possible to supply the cheese 13 to the supply roller 20 while removing the vertical length of the cheese 13 without using the rolling roller 14. Alternatively, a supply speed difference may be provided between the cheese 16 'and the cheese 13 so that the design twist yarn is used instead of the ply twist yarn.

The composite-coated elastic yarn of the present invention is particularly useful in tights,
Pantyhose, swimwear, leotard, inner,
It can be suitably used for knitted fabrics such as stretch pants (casual, golf, etc.).

[0030]

EXAMPLES In the examples described below, "the degree of blinding" and "the rate of occurrence of peeling" used in the evaluation were respectively measured by the following measuring methods.

[Decrease degree] A 13.7 cN load was hung on the sample yarn to mark a space of 30 cm, then the load was removed and relaxed by 12 cm.
To the sample length. Again, a load of 13.7 cN is hung and extended to 30 cm. This operation is repeated four times, and the length of the sample in the fifth relaxed state is fixed, and the number n of perforations (portions where the core yarn is exposed from the sheath yarn) existing in the sample length is measured. This measurement is performed for 20 samples (total of 6 m), and the degree of blindness is calculated from the following equation.

Grain Degree (%) = (Δn / 20) × 100 [Gravel Occurrence Rate] The gravel occurrence rate is a measure of the resistance of the process in which the peeling gradually increases during use of the knitted fabric. And is measured as follows.

A mark is placed at an interval of 10 mm as the dimension in the width direction of the tubular knitted fabric knitted for tights. Next, when the stretch is gradually applied in the lateral direction of the knitted fabric, the interval at which the above-mentioned dimensions change when the lightly dyed elastic yarn (polyurethane elastic yarn) starts to be seen from between the stretched loops is denoted by L ₁ . I do. This measurement is repeated 10 times, and the average value is defined as L _O , and the occurrence rate of peeling is calculated from the following equation.

Puncture occurrence rate (%) = [1− (L _O −10) / 10] ×
100 Example 1 A polyurethane elastic yarn having a fineness of 22 dtex was used as a core yarn, and a fineness of 4
Using a nylon 66 multifilament yarn of 4 dtex and 34 filaments as the sheath yarn, the number of false twists is 4000 (S twist) T / m and the heating temperature is 165 by the false twisting process shown in FIG.
A false twist coated elastic yarn was obtained by friction false twisting at a processing draft of 1.27 times and a processing speed of 200 m / min.
The draft of the polyurethane elastic yarn is 3.0 times, and the D / Y
The ratio was 2.1, the pressure of the confounding nozzle 12 was 0.0784MP, and the winding feed rate was + 8%.

Next, by the covering step shown in FIG.
A nylon 6 false twist yarn having a fineness of 22 dtex and 20 filaments was applied to the false twist coated elastic yarn obtained above at a spindle rotation speed of 10%.
The composite coated elastic yarn was manufactured by winding at 500 rpm and twist number 650 (Z twist) T / m. In addition, the draft of the cheese 13 of the false twist covering elastic yarn is 1.1 times, and the winding ratio is 0.1.
95.

The degree of opening of the obtained composite-coated elastic yarn was 1.
5%, and the peeling occurrence rate was 51%. On the other hand, the peeling occurrence rate of the knitted fabric using only the false twist-coated elastic yarn was measured and found to be 83%.

Example 2 A polyurethane elastic yarn having a fineness of 17 dtex was used as a core yarn, and a fineness of 5
Using a nylon 6 multifilament yarn of 6 dtex and 40 filaments as the sheath yarn, the number of false twists is 4000 (S twist) T / m and the heating temperature is 175 by the false twisting process shown in FIG.
A false twist-coated elastic yarn was obtained by performing friction false twisting at a processing draft of 1.25 times at a processing speed of 250 m / min.
The draft of the polyurethane elastic yarn is 2.8 times, and the D / Y
The ratio was 2.2, the pressure of the confounding nozzle 12 was 0.0882 MP, and the take-up feed rate was + 7%.

Next, in the plying step shown in FIG. 5, a cotton spun yarn having a count of 80 was applied to the false twist coated elastic yarn obtained above at a spindle rotation speed of 10,000 rpm and a twist number of 300 (Z twist) T /
m to produce a composite coated elastic yarn.
In addition, the draft 1.05 of the cheese 13 of the false twist covering elastic yarn was used.
And a winding ratio of 0.93.

The degree of peeling of the obtained composite coated elastic yarn was 1.
It was 0% and the peeling occurrence rate was 43%. On the other hand, the knitting occurrence rate of the knitted fabric using only the false twist-coated elastic yarn was measured and found to be 75%.

[0040]

As described above, according to the present invention, a long fiber yarn or a short fiber yarn is formed around a false twist coated elastic yarn comprising a core yarn and a multifilament false twist yarn of a sheath yarn. Since the core yarn is wound by twisting, the inner core yarn is less likely to be exposed from between the sheath yarns, and it is less likely to cause peeling. In addition, by appropriately selecting the characteristics of the long fiber yarn or the short fiber yarn wound around the outside, the knitted fabric knitted from this composite coated elastic yarn can be soft-touched, spun like, glossy, highly hygroscopic, and colored. A new feeling or function such as can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a composite coated elastic yarn of the present invention.

FIG. 2 is a side view showing another example of the composite coated elastic yarn of the present invention.

FIG. 3 is an explanatory view illustrating a first step of the method for producing a composite-coated elastic yarn of the present invention.

FIG. 4 is an explanatory view illustrating a second step of the method for producing a composite-coated elastic yarn of the present invention.

FIG. 5 is an explanatory view showing another example of the second step of the method for producing a composite-coated elastic yarn of the present invention.

[Explanation of symbols]

 X Wound yarn Y False twist coated elastic yarn Z Composite coated elastic yarn 1 Elastic yarn 2 Multifilament false twist yarn 2 'Multifilament yarn 3 Package (for elastic yarn) 4 Package (for multifilament yarn) 7, 15, 20 Supply Roller 8, 18 Take-off roller 9 Heater 10 Disc type twister 12 Entangling nozzle 13 Cheese (of false twist coated elastic yarn) Cheese 16, 16 '(of wrapped yarn) Cheese 19, 23 Cheese (of composite coated elastic yarn)

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) D02J 1/00 D02J 1/00 KP (72) Inventor Tohru Takahashi 1-20-20 Dojima, Kita-ku, Osaka-shi, Osaka Toray Industries, Inc. Osaka Works (72) Inventor Yoshiyuki Miki 157-32 Kamibidai, Toyooka City, Hyogo Prefecture Shinsen Kogyo Co., Ltd. (72) Inventor Kei Inoue 1-7-31 Otemae, Chuo-ku, Osaka City, Osaka Prefecture F term in Gunze Sangyo Co., Ltd. (reference) 4L036 MA04 MA05 MA06 MA10 MA24 MA33 MA35 MA37 MA39 PA07 PA21 PA42 PA47 RA24 RA25 UA01 UA06 UA08

Claims (7)

[Claims] 1. A false-twisted coated elastic yarn having a non-twisted coating structure in which a multifilament false-twisted yarn of a sheath yarn is substantially non-twisted around an elastic yarn of a core yarn. A composite coated elastic yarn having a yarn structure in which a long fiber yarn or a short fiber yarn is wound with a real twist. 2. The composite coated elastic yarn according to claim 1, wherein the sheath yarn is a polyamide or polyester multifilament false twist yarn. 3. The composite coated elastic yarn according to claim 1, wherein the long fiber yarn is a polyamide filament processed yarn, a polyester filament processed yarn, a silk yarn, an acetate yarn or a rayon yarn. 4. The composite coated elastic yarn according to claim 1, wherein said short fiber yarn is a cotton spun yarn, an acetate spun yarn, a rayon spun yarn or a wool yarn. 5. A false twist-coated elastic yarn is produced by aligning an elastic yarn and a multifilament yarn and performing false twisting, and covering a long fiber yarn or a short fiber yarn around the false twist coated elastic yarn. A method for producing a composite coated elastic yarn wound by ring processing, ply twist processing or decorative twist processing. 6. The method for producing a composite coated elastic yarn according to claim 5, wherein the false twisted coated elastic yarn after the false twisting is subjected to entanglement treatment or additional twisting. 7. The method according to claim 7, wherein the long fiber yarn or the short fiber yarn is
The method for producing a composite coated elastic yarn according to claim 5 or 6, wherein the method is a double covering in which a yarn is wound.