JP2001295148A - Polyester covered elastic yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high quality polyester covered elastic yarn excettent excellent in crimping characteristics by the specified method, and to provide the method for producing the same. SOLUTION: This polyester coated elastic yarn is characterized in that the coated elastic yarn is obtained by covering the outer periphery of an elastic yarn as a core yarn with a false twist crimped yarn of polyethylene terephthalate as a sheath yarn in a essentially twistless manner, the single filament fineness of the sheath yarn is 0.4-3.0 dtex, the number of filaments of the sheath yarn is 20-150 and elastic fastness elongation ratio of the covered elastic yarn is 30-80%. This method for producing the polyester covered elastic yarn is characterized in that a stretched elastic yarn is arranged in parallel with a polyethylene terephthalate yarn having 40-150% elongation, interlaced, subjected to drawing-false twist texturing to forma structure in which outer periphery of the elastic yarn as the core yarn is coated with the false twisted crimped yarn of poyethylene terephthalate as the sheath yarn in a substantially twistless manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester-coated elastic yarn for general clothing products and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a method for producing a polyester-coated elastic yarn by composite false twisting and the resulting yarn are already known in the art. For example, Japanese Patent Application Laid-Open No. 55-148227 discloses a false-twisted coated elastic yarn in which an elastic yarn and an already false-twisted crimped yarn are aligned, entangled, and then false-twisted again, and the production thereof. A method is disclosed.

[0003] However, in this technique, a high covering property can be obtained, but since the form of the covering yarn changes greatly, it becomes more noticeable as a streak-like defect in a knitted and woven product.
In addition, since the multifilament yarn serving as the sheath yarn is subjected to twice the temporary twist processing, there is a disadvantage that the coated elastic yarn becomes weak due to a decrease in strength or generation of fluff.

Japanese Patent Publication No. 1085653 proposes a temporary twist-covered elastic yarn in which an elastic yarn and a polyester filament yarn are aligned, subjected to a composite temporary twisting process and then entangled, and a method for producing the same. .

[0005] The provisional twist-coated elastic yarn has a high softening point and a high rigidity of the sheath yarn, so that it is difficult to form a core / sheath type concentric yarn structure. It has a drawback that it becomes easy to protrude from the filament yarn and a so-called “opening” phenomenon occurs.

[0006] As a result, no practical technology has been found, and there is a demand for a polyester-coated elastic yarn having excellent coatability and stable yarn quality and not leading to a significant cost increase, and a method for producing the same.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, and does not provide a polyester-coated elastic yarn having excellent shrinkage properties and a reasonable method, and a method for producing the same. It is assumed that.

[0008]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the polyester-coated elastic yarn of the present invention has an elastic yarn as a core yarn and a polyethylene terephthalate
A coated elastic yarn obtained by coating the false twisted crimped yarn of (i) as a sheath yarn with substantially no twist, and the sheath fiber has a single fiber fineness of 0.4 to
3.0 dtex, and the number of filaments of the sheath yarn is 20.
, And the coated elastic yarn has an elasticity and elongation of 30 to 80%,
Further, the method for producing such a polyester-coated elastic yarn is such that after the stretched elastic yarn and the polyethylene terephthalate fiber having an elongation of 40 to 150% are aligned and entangled,
By applying a draw false twisting process, the elastic yarn is used as a core yarn, and a polyethylene terephthalate false twisted crimped yarn is used as a sheath yarn around the outer periphery of the core yarn. Things.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The subject of the present invention, that is, a polyester-coated elastic yarn having excellent shrinkage characteristics and a high quality and a rational method, has been intensively studied. -The false twisted crimped yarn of (i) is arranged as a sheath yarn, and furthermore, as a coated elastic yarn having a structure of covering substantially without twisting, and further, the sheath yarn is made of a fiber of a specific fineness, and coated. By controlling the elasticity, elongation, and elongation of the elastic yarn within a specific range, it has been found that such a problem can be solved at once.

An example of the polyester-coated elastic yarn of the present invention will be described with reference to the drawings.

FIG. 1A shows a side view of the polyester-coated elastic yarn of the present invention, and FIG. 1B shows a cross-sectional view thereof. A is an elastic yarn, B is a false twisted twisted yarn of polyethylene terephthalate, and C is an entangled portion. (B) shows a structure in which a is covered with substantially no twist while twisting and reversing, and the whole covered yarn is firmly covered with the entangled portion of c.

In this cross-sectional view, the elastic yarn (a) is surrounded by the polyester false twisted yarn (b), which is a feature of the present invention.

In the yarn configuration of the coated elastic yarn, the core yarn is made of a polyurethane yarn or a polyester elastomer, and the sheath yarn is a high elongation yarn made of a highly oriented undrawn yarn of polyethylene terephthalate. A multifilament yarn spun at a spinning speed of from 2,000 m / min, usually called POY, to 6000 m / min, called OSP, is used. The coating structure of the coated elastic yarn is such that a polyethylene terephthalate filament yarn is coated as a sheath yarn on the outer periphery of the core yarn of the elongated elastic yarn substantially without twist.
Further, it has a composite coating structure having an interlaced portion in the length direction of the yarn. And the elastic yarn of the elongated core yarn is
The polyester-coated elastic yarn is located substantially at the center in the cross-sectional direction, and the surface of the elastic yarn is subjected to false twisting of heat-fixed torsion of torsion and the single-filament filament side pressure of the sheath yarn. Therefore, it has uneven traces. This uneven trace makes it easy to entangle the single-filament filament-condensed yarn of the sheath yarn as a fastener effect. Therefore, once entangled, it is hard to be unraveled and has an effect of further improving the coatability.

Next, the single-filament ken crimped yarn group of the polyethylene terephthalate sheath yarn surrounds the entangled core yarns as if they were around the outer periphery thereof. However, it is coated with substantially no twist.

[0015] The coatability is greatly affected by the fineness of the single fiber filament yarn used for such a sheath yarn and the thickness or the number of the single fiber filament yarn. In particular, the single fiber filament fineness of the sheath yarn is preferably 0.4 to 3.0 dtex.
Is set in the range. That is, when the fiber diameter is less than 0.4 dtex, the single-filament filament yarn group has a property of easily adhering to each other, so that during the false twisting after the core yarn and the sheath yarn are aligned and entangled, the core yarn is Since it becomes difficult to interrupt the sheath yarn group, a problem that coverage is not improved is caused. Conversely, when the single fiber filament fineness exceeds 3.0 dtex, the rigidity of the single fiber filament yarn of the sheath yarn is increased, so that the sheath yarn is less likely to be entangled with the core yarn and the coatability is reduced. In other words, this phenomenon is a characteristic property found in a material having a high rigidity property of the original yarn, such as polyethylene terephthalate, and is a property that is hardly seen in a polyamide filament yarn.

Also, the number of single filaments of the sheath yarn is preferably set in the range of 20 to 150 from the same consideration. If the number is less than 20, the absolute number of tangled yarns is small, and the core yarn is easily exposed from the coated elastic yarn. On the other hand, if the number exceeds 150, the single-filament filament yarn group of the sheath yarns is likely to be in close contact with each other as described above.

It is important that the elastic fastness of the polyester-coated elastic yarn of the present invention is 30 to 80%. This elasticity and elongation is a novel yarn property that shows the elasticity assuming actual use in a knitted and woven fabric product, and is the elasticity and elongation after the latent shrinkage performance is exhibited in a constrained state. That is, if the elasticity and elongation ratio is less than 30%,
Since the elongation rate is too low, it is not suitable for general clothing products characterized by a stretch function, and conversely,
If it exceeds 0%, the stretchability is too large and it is not suitable for general clothing products, and it is suitable for special uses such as industrial and medical uses.

A specific method for measuring the elasticity and elongation is as follows. First, the coated elastic yarn is taken in a scalpel, immersed in warm water at 90 ° C. for 20 minutes while suspending a small load of 0.002 cN / t (about 2 mg / d), and then taken out and naturally taken out for 24 hours. It is dried and subjected to a constant load of 0.1 cN / t (about 0.1 g /
d) is suspended for 30 seconds, its length L1 is read, and after unloading, a load of 0.002 cN / t (about 2 mg / d) is suspended, its length L2 is read, and it is calculated by the following formula.

Elasticity and stretch ratio (%) =） (L1-L2)
/ L2｝ × 100 The polyester-coated elastic yarn of the present invention has a tangled portion in the yarn length direction, and the number thereof is preferably 30 to 1 / m.
It is preferable that the number is 150. When the number of entanglements is less than 30, the covering property is weakened, and the so-called "opening" phenomenon in which the elastic yarn of the core yarn is exposed from the sheath yarn is likely to occur. Conversely 150
If the number exceeds the number, the converged narrow portion of the entangled portion can be seen on the product, and especially in the case of a woven fabric, periodic "irritation" unevenness is caused, and the surface quality is easily lowered.

A specific method for measuring the number of confounds is as follows. Spread a chalkboard on the bottom of a square bat and pour water. The number of entanglements obtained by floating and covering the coated elastic yarn having a length of 50 cm on the water is read, and the number of entanglements is defined as the number converted per 1 m.

Since the polyester-coated elastic yarn of the present invention has a real twist in the S or Z direction and is preferably coated concentrically, the arrangement of the core yarn and the sheath yarn in the yarn cross-sectional direction hardly changes. However, in the yarn side direction, the sheath yarn is twisted in one direction, so that the covering property is further improved and becomes stronger. Of course, since the number of separate steps increases, the production cost increases, but it is suitable for applications requiring high coating durability or high-grade products.

When the actual twisting direction is the same as the false twisting direction of the coated elastic yarn, if the actual twisting direction is the same as the false twisting direction, the untwisted linen-shaped yarn has a tight and tight feeling. When the yarn has a real twist in the opposite direction to the above, the yarn becomes a bulky, soft, soft yarn form. In any case, there is no significant difference in covering property, but it is better to use properly depending on the application. For example, in a stretch fabric, an unbroken linen yarn form is preferable, but in a knitted fabric such as tights and pantyhose, an overblown linen yarn form is preferably used.

The actual number of twists of the coated elastic yarn is determined by the fineness and application, but is preferably in the range of 50 to 500 T / m, and preferably 100 to 500 T for textiles.
/ M, for knitted fabrics, preferably 50 to 300 T / m. In addition, a high twist range of 500 to 3000 T / m may be used, but it may lead to a high cost, and the texture of the coated elastic yarn is hardened or the bulkiness is reduced.
It is necessary to consider this point.

Next, a method for producing the polyester-coated elastic yarn of the present invention will be described.

First, a stretched elastic yarn is used as a core yarn, while a high elongation yarn made of polyethylene terephthalate having an elongation of 40 to 150% is used as a sheath yarn. After the application, a draw false twisting process is performed to form a structure in which the elastic yarn is used as a core yarn, and a polyethylene terephthalate false twisted crimped yarn is used as a sheath yarn around the outer periphery of the core yarn without substantially twisting. However, the process will be described in detail with reference to the process chart of FIG.

FIG. 2 is a schematic diagram showing an example of the process of the present invention. The elastic yarn 1 is stretched between the draft roller 2 and the draft roller 2 at a constant magnification, while the polyethylene terephthalate filament yarn 3 is unwound, and both yarns are aligned to form the draft roller 2.
To supply. Both yarns are entangled by the entanglement nozzle 4 between the feed roller 5 and the draft roller 2 and then heat-set by the false twisting twister 7 in the false twisting area and heat set by the heater 6. After the application, the coated elastic yarn having the above-described structure is manufactured by pulling it out of the delivery roller 8 and winding it up in a cheese by the take-up roller 9.

The present invention is characterized in that the order of false twisting and entanglement is reversed from that of the prior art. In other words, after the confounding treatment, by performing false twisting, the properties of the elastic yarn and the high elongation yarn are used well, and the elastic yarn is located on the core side by using its resilience, and the high elongation yarn is While arranging outside by oversupply by overfeed,
They could be entangled with each other. By performing such a confounding treatment, the core-sheath structure of the present invention can be more completely achieved.

The elastic yarn used for the core yarn 1 is a filament yarn made of polyurethane or the like, and may be either a monofilament or a multifilament.
At least apparently, a monofilament-shaped material may be easy to handle. The thickness of the yarn is preferably 10 to 110 dte
It is preferable to use those in the range of x, but for general clothing, those in the range of 10 to 80 dtex are preferable. Since the draft ratio for elongation is related to the feed rate of false twisting or the false twisting ratio, the delivery roller 8 and the elastic yarn 1 are stretched.
It is preferable that the stretching ratio of the yarn feeding roller is set in a range of 3 to 4 times in total.

When drafting the core yarn 1 with the draft roller 2, in order to improve the unwinding property of the core yarn 1 and to perform uniform drafting, a draft roller is further provided before the draft roller 2. It is preferable to add a step.

The polyester filament yarn used for the sheath yarn 2 has a birefringence called POY of 30 to 90 × 10 ^-3.
Can be used. POY
Is superior in heat form fixability to already drawn DT yarn, so it is easy to have a core-sheath yarn structure during false twisting, and to provide a coated elastic yarn excellent in coatability and stretch power. It is preferable because it can be provided.

The elongation of the sheath yarn is preferably 40 to 1
It is better to be 50%. If the elongation is less than 40%, the processability of the composite yarn is low, and the coating property is poor, which is not preferable. If it exceeds 150%, there is no particular problem in the composite yarn processability and the coatability, but the sheath yarn enters the region of the undrawn yarn, temperature control is added, and the yarn quality control becomes difficult. Although possible, there is a problem that the cost is increased.

As the high elongation filament yarn used for the sheath yarn, the spinning speed of the POY is preferably 20.
A POY having a spinning speed in the vicinity of 4000 m / min is used.
Since there is a unique region in which the molecular structure is highly oriented and low crystalline, the use of POY in this unique region further improves the shrinkage, so that the coating elasticity is excellent in coverage and stretch power. Yarn can be obtained. PO here
As Y, OSP, DSD or normal pressure dispersible dyeing type, high shrinkage type, irregular cross section, high gloss type, low gloss type,
Different shrinkage type and bimetal latent shrinkage type may be used.

The fineness of the filament yarn used as the sheath yarn is preferably 30 to 270 dtex, but for general clothing, the fineness in the range of 50 to 170 dtex is preferably used from the viewpoint of coating formation.

In order to produce the polyester-coated elastic yarn of the present invention, both the core yarn and the sheath yarn are aligned and supplied to the draft roller 2, and the yarn is fed between the feed roller 5 and the draft roller 2. The yarns are entangled with the entanglement nozzle 4 at a rate of 0 to +5.
%, And the nozzle pressure is preferably 0.1 to 0.5 MP.

Further, a normal composite false twisting process is performed between the feed roller 5 and the delivery roller 8;
The set temperature of the heater 6 is preferably 150 to 220C. However, the speed of the delivery roller 8 is 1000 m / m.
In the case of a high speed of at least in or a non-contact short type in which the length of the heater 6 is 1 m or less, the set temperature is preferably set to a temperature of 300 to 500 ° C. Is good.

The false twist twister 7 of the composite false twisting process may be any of a spindle type, a disk type, and a belt type. Among these, the disk type has good covering properties, stretch power or uniformity. Excellent and preferably used.

The coated elastic yarn that has been subjected to the composite false twist processing is as follows:
Pull out from delivery roller 8 and take it out from take-up roller 9
Wound up. In order to further improve the covering property before winding, a confounding treatment can be performed again, or a twisting can be performed instead of the confounding processing.

The thus obtained polyester-coated elastic yarn of the present invention has a very strong coating property, because the intermittently entangled portion is further coated on the substantially twist-free coating form by twist reversal.

As a result, "opening" in which the core yarn, which is the biggest problem of the polyester-coated elastic yarn, is exposed from the sheath yarn is reduced. That is, the term "peeling" used here is used as a criterion for evaluating the covering property of the sheath yarn when the coated elastic yarn is dyed into a knitted fabric such as tights or pantyhose, i.e., dyed. It refers to the appearance in which the hard core yarn looks white from the gap between the sheath yarns.
In the present invention, this is carried out at the yarn stage by the following method, and is expressed as "the degree of peeling".

A load of 13.7 cN is hung on the sample yarn,
Mark the 30 cm interval, then remove the load, relax the interval by 12 cm and allow the 30 cm interval to
Adjust to a sample length of m. Next, the sample yarn is again set to 1
Suspend a load of 3.7 cN and extend the gap to 30 cm. This operation is performed once, and is repeated four more times, for a total of five times, and the fifth relaxed sample length is fixed, and the number of open portions within the sample length is measured. 20 measurement operations so far (total: 30 cm x 20 times = 6 m)
Then, “the degree of blindness” (%) is calculated from the following equation. In addition,
Here, the term “dyeing” refers to 10
A low-temperature dyeing method of dyeing at a low temperature of 0 to 110 ° C is employed.
The dye is a disperse dye (Dianix manufactured by Nagase & Co., Ltd.)
Tuxedo Black. F connect).

Grazing degree (%) = (Σn / 20) × 100 The larger the numerical value is, the more noticeable the white defect is, and preferably the gramming degree is 30% or less. . Such a polyester-coated elastic yarn having a small degree of peeling, that is, excellent in coatability, means that the core yarn is substantially concealed by the sheath yarn, and in an extreme case, is coated concentrically. Things.

Such a polyester-coated elastic yarn has not been able to be commercialized so far. By completing such a coated elastic yarn, it can be applied to a polyester fabric. Uses that can be expanded, and furthermore, preparation in knitting and woven fabrics, yarn breakage, fluffing or "twitching" of knitting and weaving are reduced, and process passability is improved, so that cost reduction can be achieved. It is.

Since the coating form is substantially non-twisted,
The effect of maintaining bulkiness is great, there is a soft feeling of texture,
Furthermore, since it has the feeling of "tension" and "waist" of polyester, a high quality product can be obtained.

In particular, by using POY wound at a spinning speed of about 4000 m / min as a polyester multifilament yarn of a sheath yarn, a polyester-coated elastic yarn with further improved coatability and stretch power is produced. Such coated elastic yarns are ideal for applications requiring high power.

[0045]

The present invention will be described below in more detail with reference to examples.

The degree of grossness was measured and evaluated by the following method.

A load of 13.7 cN is hung on the sample yarn,
Mark the 30 cm interval, then remove the load, relax the interval by 12 cm and allow the 30 cm interval to
Adjust to a sample length of m. Next, the sample yarn is again set to 1
Suspend a load of 3.7 cN and extend the gap to 30 cm. This operation is performed once, and is repeated four more times, for a total of five times, and the fifth relaxed sample length is fixed, and the number of open portions within the sample length is measured. 20 measurement operations so far (total: 30 cm x 20 times = 6 m)
Then, the “degree of slimming” (%) was calculated from the following equation.

In the above-mentioned dyeing, the sample yarn was treated with a disperse dye (Dianix Tuxedo Black, manufactured by Nagase Sangyo Co., Ltd.).
k. F conn) was immersed in a dyeing bath at 105 ° C. containing 5% owf for 5 minutes for dyeing.

Grading degree (%) = (Δn / 20) × 100 Example 1 A polyurethane elastic yarn of 44 dtex was used as a core yarn.
Using a high elongation yarn of 85% elongation of a 55 dtex 24 filament polyester multifilament yarn as a sheath yarn, both yarns are aligned, and the overfeed rate +
After confounding treatment at 1.5% and confounding pressure 0.3MP,
Compound false twisting was performed under the conditions of a temperature of 190 ° C., a draw ratio of 1.7 times, a D / Y ratio of 1.8, and a delivery roller speed of 300 m / min, and the film was wound.

As a result, the obtained core-sheath structured yarn is non-drilled (drilling degree: 0%) and arranged in a concentric circle, and the sheath yarn is obtained by twisting and reversing the core yarn. It was a polyester-coated elastic yarn which was covered with substantially no twist having an interlaced portion and had excellent stretchability of 41% / stretch and elongation at a rate of 59 / m. Example 2 A polyurethane elastic yarn of 44 dtex was used as a core yarn in 2.1.
Birefringence (Δn) obtained at a spinning speed of 4000 m / min into a sheath yarn at 87 × 10 ⁻³ , elongation 99%, 125d
tex, a 36-filament polyester filament yarn POY, both yarns are aligned and entangled at an overfeed rate of + 1.5% and an entanglement pressure of 0.3MP, a heater temperature of 185 ° C and a draw ratio. 1.6 times, D / Y ratio 1.
8. Under the condition of a delivery roller speed of 300 m / min, composite false twisting was performed and wound.

As a result, the obtained core-sheath structured yarn is a non-drilled (zero-drilling degree) arrayed in a concentric circle, and the sheath yarn is obtained by twisting and reversing the core yarn. Having a substantially stretch-free covering, with a strong stretch ratio of 58%, and having 66 entanglements /
Thus, a coated elastic yarn having excellent coatability was obtained.

This covering yarn is added to S in the direction of false twisting by 30%.
By applying 0 t / m of extra yarn, residual torque was almost eliminated, and a very bundled coated elastic yarn was obtained. Comparative Example 1 A polyurethane elastic yarn of 44 dtex was used as a core yarn at 2.0
Using a high elongation yarn of 85% elongation of a polyester multifilament yarn of 55 dtex 24 filaments as a sheath yarn, the both yarns are aligned, and the heater temperature is 190.
, A draw ratio of 1.7 times, a D / Y ratio of 1.8, a delivery roller speed of 300 m / min, a false twisting process, and an overfeed rate of + 1.5%. It was entangled at a pressure of 0.3MP and wound up.

As a result, the obtained yarn has a perforation (a degree of perforation of 70%) and cannot be said to be a core-sheath yarn arranged substantially in parallel. Without the twist reversal, the coated elastic yarn as in the example was not obtained.

[0054]

According to the present invention, general stretch knitted fabrics, knitted fabrics for sports, coating base fabrics, medical tools such as bandages, corsets and rehabilitations, sanitary materials such as diapers, socks, pantyhose and tights Materials suitable for undercarriage articles, bags, bags, goods, shoes, and the like can be provided.

[Brief description of the drawings]

FIG. 1 is an external view showing an example of a polyester-coated elastic yarn according to the present invention.

FIG. 2 is a schematic view showing a step of producing the coated elastic yarn of the present invention.

[Explanation of symbols]

 1: Elastic yarn for core yarn 2: Draft roller 3: Filament yarn for sheath yarn 4 Entangling nozzle 5: Feed roller 6: Heater 7: False twist twister 8: Delivery bell roller 9: Winding roller -La

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Claims (4)

[Claims] 1. A coated elastic yarn obtained by covering an elastic yarn as a core yarn and a polyethylene terephthalate false-twisted crimped yarn as a sheath yarn around the outer periphery thereof with substantially no twist. The single fiber fineness is 0.4 to 3.0 dtex, the number of filaments of the sheath yarn is 20 to 150, and the elastic elasticity of the coated elastic yarn is 30 to 80%. Polyester coated elastic yarn. 2. The polyester-coated elastic yarn according to claim 1, wherein the number of entanglements is 30 to 150 / m in the yarn length direction. 3. The polyester-coated elastic yarn according to claim 1, having an actual twist number of 50 to 1000 T / m. 4. An elongated elastic yarn having an elongation of 40 to 150.
% Of polyethylene terephthalate fiber and then subjected to a entanglement treatment, followed by a draw false twisting process, whereby the elastic yarn is used as a core yarn and polyethylene terephthalate is false twisted and crimped around the core yarn. A method for producing a polyester-coated elastic yarn, wherein the yarn is used as a sheath yarn and is coated with substantially no twist.