JP2935043B2 - Coated elastic yarn and method for producing the same - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a coated elastic yarn suitable for dyed yarn and a method for producing the same, and more particularly, to twin yarn after untwisting false twisting from the beginning. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated elastic yarn capable of avoiding a difference in dyeing between layers in package dyeing and a breakage of a polyurethane elastic yarn during rewinding by ply twisting, and a method for producing the same.

[Prior Art] As a method for dyeing a coated elastic yarn, a skein-shaped stuffed package dyeing has been conventionally used, and a skein-like jet type, cheese, and cone-wound dyeing have not been implemented.

Also in the case of the above-described package dyeing, the amount of skein wound is limited by the elasticity of the elastic yarn, and the elastic yarn is cut in the ewinding process due to a difference in drying degree of the skein after dyeing or insufficient expander. Had the problem that

Regarding false twist coated elastic yarn, Japanese Patent Publication No. 49-9427,
JP-A-50-28536, JP-A-53-42811 and JP-A-60-23183
No. 6, JP-B-42-25511, JP-A-48-33143, and the like.

Of the three patents, the first three patents dispose the elastic yarn and the thermoplastic synthetic filament yarn in a core / sheath shape and perform a composite temporary twisting process. This is a technique of coating in a core / sheath shape, in which the setting range of the false twist setting temperature is set to a low value to prevent the elastic yarn from deteriorating and maintain the good elasticity of the elastic yarn. However, in these techniques, since the action of the false twisted Yoriken crimped yarn to restrain the elastic yarn of the core yarn is loosened, there is a tendency that the coatability is reduced, and if the rewinding is performed, the coatability is further reduced. Had disadvantages.

Further, the latter three patents relate to a technique of applying a real twist with an elastic yarn, a thermoplastic synthetic fiber, and a first twist, and then untwisting and temporarily twisting at a normal temporary twist temperature, and high bulkiness is obtained. . However, also in this case, there is a disadvantage that the coatability is substantially reduced.

Moreover, neither of these techniques discloses any means for dyeing yarn.

[Problems to be Solved by the Invention] The conventional temporary twist-covered elastic yarns described above all have insufficient adaptability and entanglement between the polyurethane elastic yarn and the thermoplastic synthetic fiber. Due to being squeezed, there is a drawback that the coatability is reduced and the polyurethane elastic yarn of the core is cut.

The object of the present invention is to eliminate such conventional drawbacks, and even when squeezed in each step, the displacement between the core yarn and the sheath yarn hardly occurs, the decrease in the coating property is small, and the process passability is good. so,
Furthermore, the present invention aims to provide a coated elastic yarn which can be uniformly dyed with little difference in dyeing between layers in package dyeing and has less elastic yarn breakage during subsequent rewinding.

[Means for Solving the Problems] According to a configuration of the present invention for achieving the above object, a stretched elastic yarn and a thermoplastic synthetic fiber filament yarn are false-twisted in a state where priming is performed. By twisting the false-twisted coated elastic yarn that has been subjected to
A portion where the thermoplastic synthetic fiber filament yarn is sandwiched and twisted between the elastic yarns of the core portion and each yarn is joined and integrated;
A coated elastic yarn characterized by having, in the longitudinal direction of the yarn, a thermoplastic synthetic fiber filament yarn of a sheath yarn and a bulky portion bulging in an arch shape alternately with respect to an elastic yarn of a core yarn.

Hereinafter, a coated elastic yarn of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a schematic view of a coated elastic yarn according to an embodiment of the present invention.

In FIG. 1, a coated elastic yarn of the present invention comprises two elastic yarns 1 and 1 'in a core portion and a false-twisted thermoplastic synthetic fiber filament yarn 2 and 2' constituting a peripheral portion. Twisted and twined.

The elastic yarn 1 constituting the core portion is originally twisted after being aligned with the thermoplastic synthetic fiber filament yarn 2 in the primary twisting step, but is subjected to a false twisting process and then twin-twisted. By this means, the portion where the yarns constituting the coated elastic yarn are joined and integrated by twisting, and the thermoplastic synthetic fiber filament yarns 2 and 2 'of the sheath yarn with respect to the elastic yarns 1 and 1' of the core yarn. The coated elastic yarn has a bulky portion which is separated and bulges in an arch shape alternately in the longitudinal direction of the yarn.

That is, between the twisted portion and the twisted portion, the thermoplastic synthetic fiber filament yarn 2 and the thermoplastic synthetic fiber filament yarn 2 'exhibit a bulky shape in which the thermoplastic synthetic fiber filament yarn 2' bulges in another direction in an arch shape.

That is, the feature of the coated elastic yarn of the present invention is that the portion where the thermoplastic synthetic fiber filament yarns 2 and 2 'are twisted and sandwiched between the elastic yarns 1 and 1' forming the core portion, and the elastic yarn 1 ,
1 'and thermoplastic synthetic filament yarns 2 and 2' alternately have arch-separated portions, and when subjected to stretching or relaxing action, elastic yarns 1 and 1 '
In the portion where the thermoplastic synthetic fiber filament yarns 2, 2 'are twisted and sandwiched, no yarn displacement occurs,
The core yarn and the sheath yarn are firmly connected. Therefore, there is no concern that, even if it is squeezed in the preparation step, the knitting step, or the like, the thread may be caught or displaced or the elastic thread of the core thread may be broken.

In the present invention, it is preferable that the ply twist is performed in the direction opposite to the direction of the ply twist and with the number of twists substantially equal to or less than the number of ply twists.

The elastic yarns used in the present invention include polyurethane elastic yarns, polyester elastic yarns, and polyamide elastic yarns. Among them, polyurethane elastic yarns are widely used.

The polyurethane elastic yarn may be either a monofilament yarn or a multifilament yarn, but from the viewpoint of elongation and recovery, a multifilament yarn is generally stronger than a monofilament yarn and is more preferable.

The denier of the polyurethane elastic yarn is preferably 10 to 70 denier, and particularly preferably 20 to 40 denier for outerwear swimsuits and leotards that require soft elasticity. Further, the elongation at break is desirably 500% or more.

A bright type containing a small amount of a matting agent such as titanium oxide or a clear type containing no matting agent at all is desirable in order to obtain a uniform color in deep color dyeing.

In the present invention, the thermoplastic synthetic filament yarn is a filament yarn of polyamide, polyester, acryl, polypropylene, vinyl chloride or the like, and may be a composite yarn of these.

The total denier of the thermoplastic synthetic fiber is 20 to 210
Denier, 20 for socks and tights and stockings
140 denier, 30-70 denier for innerwear and 50-210 denier for outerwear are preferred. The single yarn denier may be generally 0.1 to 5.0 denier, more preferably 0.25 to 3.0 denier.

The cross-sectional shape is usually a circular cross-section, but may be a modified cross-section such as a five-lobe or a triangle.

Next, the method for producing a coated elastic yarn according to the present invention is characterized in that the stretched elastic yarn and the thermoplastic synthetic fiber filament yarn are subjected to priming in a aligned state, and then false-twisted to form a false-twisted coated elastic yarn. In this case, the twist direction of the primary twist and the twist direction of the false twisting process are the same, and then the false twist-coated elastic yarn is twisted.

In the above method for producing a coated elastic yarn, the number of twists (Tw) in the lower twisting step is less than 300 T / M, and the draft ratio of the elastic yarn is
It is preferable to twist with a thermoplastic synthetic fiber filament yarn while drafting 1.5 to 4.5 times.

In the false twisting step, the twisting direction of the false twist is the same as that of the lower twist. False twist setting temperature (Te) 140-1
It is preferable to satisfy the condition that the range of 90 ° C. is satisfied and the false twist coefficient (K) defined below is 20,000 to 23,000.

Next, in the present invention, the false twist coefficient (K) used in the false twist processing step is defined by the following equation.

Here, D is the total denier of the thermoplastic synthetic fiber filament yarn, ρ is the specific gravity of the fiber, and T is the number of false twists (T / M).
It is.

Furthermore, in the twisting step of the false twist-coated elastic yarn obtained in the previous step, it is important to twist in the direction opposite to the reverse twist.

Further, in the same false twisting step, the ply twist direction of simultaneous processing of each single yarn from S to Z may be either S twist or Z twist, and the number of ply twists Td (T / M) is lower twist Tw300T. The same as or less than / M is desirable.

Hereinafter, a method for producing a coated elastic yarn of the present invention will be described with reference to the drawings.

FIGS. 2 and 3 are process schematic views showing one embodiment of the method for producing a coated elastic yarn of the present invention. FIG. 2 is a bottom twisting process diagram, and FIG. 3 is a false twisting process diagram. It is.

The lower twisting process diagram shown in FIG. 2 is a conventional ring twisting machine, in which the elastic yarn 1 is supplied by a winding tube 13 and its surface driving rollers 4, 4 '.
Is rotated, the elastic yarn 1 is fed from the winding tube 3 at a constant speed. Elastic thread 1
Is drafted between a feed roller 5 rotating at a peripheral speed higher than that of the surface drive rollers 4 and 4 ′, stretched to a constant elongation state, sent out toward a twisting ballooning mechanism, and Is passed through the traveler 6 and wound around the pan 8.

On the other hand, the supply of the thermoplastic synthetic fiber filament yarn 2 is as follows.
The elastic yarn 1 and the feed roller 5 are unwound from the winding body 9 by the feed roller 5 and fed out.
Then, they are aligned and ply-twisted.

The process shown in FIG. 3 is a false twisting machine equipped with a one-stage heater, which supplies a lower twisted yarn (twisted yarn) composed of the elastic yarn 1 and the thermoplastic synthetic fiber filament yarn 2 obtained in the process of FIG. Is unwound from the surface of the wound body 8 by the first feed roller 11 and is fed out, and reaches the first feed roller 11 via the yarn path guide group and the tension adjusting device 10 in the meantime. A heater 12 and a false twist spindle (or spinner) 13 are arranged between the first feed roller 11 and the second feed roller 14 so that the false twist spindle 13 is adjusted at an appropriate magnification.
, An arbitrary number of false twists is given, and the heater 12 is heat-set at an arbitrary temperature. Finally, it is stretched at an appropriate magnification between the third feed roller (or take-up roller) 15 and the second feed roller 14, and is wound up as a coated elastic yarn 16.

Although not shown in the drawing, the false twist-coated elastic yarn that has undergone the above-described false twisting step is then subjected to the twisting step in the present invention as described above.

Notable properties of the obtained coated elastic yarn are that it is covered with the lower twist and twisted in the same direction by false twisting, so that the elastic yarn is slightly deteriorated and the elongation at break is 100%.
It is as follows.

Common to the first twist false twist, when the actual twist is in the stretched state of the elastic yarn, to prevent obtaining sufficient crimp expression,
Initial crimp elongation is reduced.

Since the elastic yarn and the synthetic fiber by false twisting are stretched / heat-treated, the stretch power and the boiling water shrinkage of the elastic yarn are reduced.

There is a lower twist, and the fibers are entangled and mixed (a portion where the twists are densely gathered), and have a spring-like shape (similar to the restoring force of a spring).

Partially untwisted tone, showing the appearance of entangled mixed fiber, characterized by alternately coexisting areas where the openness of the thermoplastic yarn is opposite to the area where the covering of the elastic synthetic yarn is large. It is to exhibit.

Therefore, a decrease in the coatability, which is common to false twisted crimped yarns in which only an elastic yarn and a thermoplastic synthetic fiber filament yarn are aligned, is not seen, and the yarn has a coatability as if it were a covering twisted yarn.

It should be noted that the method in which the false twist direction is the same as the twist direction of the lower twist substantially increases the coatability as compared with the reverse false twist or the overtwisted false twisted yarn.

Next, the relationship between cheese winding density and dyeing properties will be described.

In the present invention, it is preferable that the cheese winding density (ρ) after the twin yarn twisting is set to 0.3 g / cm ³ or less.

In the present invention, twin yarn twisting provides excellent leveling properties as compared with single yarn use. This is a result of the difference in the cheese winding density, and the winding density (ρ) of the twin yarn twisted in the present invention.
0.32 After staining what was before staining 0.21~0.27g / cm ³
Whereas the increased to 0.35g / cm ^3, the single yarn Tsukai soft cheese usually what was before staining 0.23~0.27g / cm ³ is, to increase the staining 0.38~0.41g / cm ^3, winding amount There was a slight difference in staining between the outer layer and the inner layer of 500 g. Further, when various configurations of the twin yarn twisting were combined, the combination of the pre-twisting / false twist (twisting) conditions in the previous stage was changed from lower twist (from S + S) / upper Z to lower twist (+ Z from Z). From the upper side S, from the lower side (from + Z from S) / from the upper side S, or from the lower side (+ Z from S)
/) The properties of the final coated elastic yarns obtained by changing from the upper twist Z to｝ are all slightly different, while the number of twists (Td) at the later stage of twin yarn twisting is 50, 100, 150, 200, 250, 300, 35
When the Td is changed to 0, 400, and 500 T / M, the cheese tends to lose its shape if Td is 150 T / M or less, and the stability of the cheese shape is high if the Td is 350 T / M or more. It was found that there was a difference in arrival. Therefore, the number of twists (Td) is 200 ± 50T
At / M, an appropriate flow-through effect can be obtained at the time of dyeing, and good results can be obtained by preventing the occurrence of cheese shape collapse.

The coated elastic yarn of the present invention can also be employed in the case of the compression-type package dyeing method by selecting an appropriate compression ratio.

As described above, the twisting of the stretched elastic yarn and the thermoplastic synthetic fiber filament yarn is performed by false twisting in a subsequent step, so that the twisted untwisted tone and the appearance of interlaced mixed fiber are exhibited. At the same time, by applying the twin yarn twisting, a thermoplastic synthetic fiber filament yarn can be sandwiched and twisted between two elastic yarns, and it is stable in soft cheese winding and dyeing for subsequent cheese dyeing. Work. At this time, effective conditions to be applied are as follows: the boiling elastic shrinkage (S) of the coated elastic yarn of the present invention is 7.0% or less, and the elastic recovery (C
It is important that R) is 55% or less. The means for obtaining such characteristics is based on the setting of the false twist temperature specified in the present invention. Both properties have a small processing change at the time of cheese dyeing and work so as not to cause a difference between layers of cheese. Making the winding density (ρ) of the cheese 0.3 g / cm ³ or less, which was almost impossible with a covering twisted yarn containing ordinary elastic yarn, was given a false twist set to the elastic yarn. This and the fact that the thermoplastic synthetic fiber filament yarn has an arch-like bulky shape due to twine twisting assists the penetrating action of the dyeing liquid as a material to be dyed and prevents the inner layer from being compressed.

And, for the reasons described above, after rewinding the cone from the twine twisted dyed cheese, when used in circular knitting or woven fabric, the two elastic yarns obtained by twining twisting are in the core, Since the thermoplastic synthetic fiber filament yarns are twisted and spread to each other in an arch shape, the passing characteristics during weaving and weaving may be smooth, and the resulting product surface may be smooth, have a synthetic fiber luster, and have a soft texture. Work easily.

Next, the present invention will be described specifically with reference to Examples.
The present invention is by no means limited to these.

Example 1 A nylon yarn 70 denier, 34 filaments, a round cross-section yarn (manufactured by Toray Industries, Inc., “Amiran”) and a twisting machine with an elastic yarn positive supply device shown in FIG. 2 (A) were used.
Polyurethane elastic yarn is type 127, 20 denier (Toray
(Dupont Co., Ltd., registered trademark "Operon") was set at a draft of 3.5 times. The false twisting machine used was a one-heater / spindle type (F-103 manufactured by Toshiba Machine Co., Ltd.) and then twin-twisted using a normal ring twisting machine. The production conditions are as shown in Table 1. To obtain a coated elastic yarn. For comparison, use a single covering yarn (the original yarn used is the same as above, N70-34-205 was used as a wooly nylon yarn under normal conditions; S270-E, manufactured by Toray Dupont, single covered yarn) Was. Soft wound winding winder for cheese dyeing (manufactured by Kozu Seisakusho; RT winder) and ordinary cheese dyeing machine (manufactured by Hisaka Seisakusho; LLC)
Mold package dyeing machine).

The properties of the obtained coated elastic yarn are as shown in Table 1.
As is clear from Table 1, the twin yarn twisting of the coated elastic yarn having a boiling water shrinkage of 7.0% or less and an elasticity recovery of 55% or less is as follows.
All show that the cheese uniform dyeing property is good. However, when using a single yarn, the winding density of the dyed cheese is increased or the leveling property is slightly reduced.

Example 2 Nylon, polyester, and acrylic yarns were used as thermoplastic synthetic fiber filament yarns, and polyurethane elastic yarns were used for each type of "Operon" (described above).

Table 2 shows the various yarns used, the production conditions of the twisted yarn, and the characteristics of the obtained coated elastic yarn.

As is evident from Table 2, the coated elastic yarn, in which the heat setting property is improved more than the nylon yarn depending on the material, has a low boiling water shrinkage ratio and an elastic recovery ratio, and is relatively easy to dye cheese. Among these, "Silpalon", "Lumilet", etc., which have good low-temperature setting properties, are remarkable.

[Effects of the Invention] As described above, according to the present invention, the following effects can be obtained.

B) After the stretched elastic yarn and the thermoplastic synthetic fiber filament yarn are subjected to false twisting, the yarn is false twisted, and then the twin yarn is twisted, so that the coated elastic yarn for the dyed yarn is the core elastic yarn. The thermoplastic synthetic fiber filament yarn that is false twisted between the two yarns is sandwiched and twisted, and the thermoplastic synthetic fiber filament yarn is spread in an arch around the outer periphery of the sheath, so that the dyeing material in the cheese is formed. The penetration of dye solution is good. At the same time, since the coated elastic yarn is provided with the false twist set, the compression of the inner layer of the cheese does not proceed as a result of the reduction in the boiling water shrinkage and the expansion / contraction restoration rate, and uniform dyeing is possible.

B) Furthermore, the number of priming twists (Tw) is less than 300 T / M, and the false twisting is in the same direction as the priming, and the number of twine twists (Td) is
When the lower twist (Tw) is less than or equal to 300 T / M or less, it is possible to obtain a coated elastic yarn having a twisted untwisted tone and an entangled mixed fiber appearance, and also an elastic yarn. Since the portion where the covering property of the thermoplastic synthetic fiber filament yarn is large and the portion which is opened oppositely coexist alternately, a low stretch coated elastic yarn having a high elongation recovery stress is obtained.

As a result, if it is supplied to circular knitting after cheese dyeing, knitting properties are good, and there is no fear of elastic yarn cutting without inducing hooking with a guide at all and inducing twin yarn displacement. is there. The obtained circular knitted fabric is a fabric having a smooth surface, rich in stretchability, and good in elongation recovery.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a coated elastic yarn according to the present invention. FIGS. 2 and 3 are process schematic views showing one embodiment of the method for producing a coated elastic yarn of the present invention. FIG. 2 is a bottom twisting process diagram, and FIG. 3 is a false twisting process. FIG. 1, 1 '... elastic yarn 2, 2' ... thermoplastic synthetic fiber filament yarn 7 ... ring 10 ... tension adjusting device 12 ... heater 13 ... false twist spindle

Continuation of the front page (56) References JP-A-48-33143 (JP, A) JP-A-54-112247 (JP, A) JP-A-60-231836 (JP, A) JP-B-49-9427 (JP, A) , B2) JP 50-28536 (JP, B2) JP 53-42811 (JP, B2) JP 42-25511 (JP, B2) (58) Fields surveyed (Int. Cl. ⁶ , DB Name) D02G 1/00-3/38

Claims (4)

(57) [Claims] 1. A false-twisted coated false elastic yarn obtained by false-twisting a stretched elastic yarn and a thermoplastic synthetic fiber filament yarn in a state where the yarn is subjected to a false twist. Thus, the thermoplastic synthetic fiber filament yarn is sandwiched and twisted between the elastic yarns of the core portion, and the respective yarns are combined and integrated, and the thermoplastic synthetic yarn of the sheath yarn with respect to the elastic yarn of the core yarn. A coated elastic yarn characterized by having alternately, in the longitudinal direction of the yarn, bulky portions in which the fiber filament yarn bulges in an arch shape. 2. The twisting direction of the primary twist when the stretched elastic yarn and the thermoplastic synthetic fiber filament yarn are subjected to priming in a state of being aligned and then subjected to false twisting to form a false twist coated elastic yarn. When,
A method for producing a coated elastic yarn, characterized in that the direction of false twisting is the same direction, and then the false twisted coated elastic yarn is twisted. 3. The method of claim 1, wherein the elastic yarn stretched at a draft ratio of 1.5 to 4.5 times and the thermoplastic synthetic fiber filament yarn are aligned and the number of ply twists (Tw) is less than 300 T / M. After applying, when performing false twisting and forming a false twist coated elastic yarn, the twist direction of the false twist and the twist direction of the false twist processing are the same twist direction,
Next, the false twist-coated elastic yarn is twisted. 4. The set temperature (Te) of the false twist processing is 140 to 190 ° C.
False twist coefficient (K) that satisfies the range of
The method according to claim 2 or 3, wherein a condition of 20,000 to 23,000 is satisfied.