JP2000170046A - Multi-stage covered elastic yarn and device for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a multi-stage covered elastic yarn having the characteristics of both a single covered yarn and a double covered yarn. SOLUTION: This multi-stage covered elastic yarn is produced by winding a plurality of the same or different kinds of non-elastic cover yarns as separated covering yarns 2b, 3b on a core yarn 1b comprising non-twisted elastic fibers in the same direction at plural stages. It is desirable that the sum of differences between the wound densities of the covering yarns does not exceed 1,000 turns/ m. A covering yarn wound in the reverse direction may be inserted into the covering yarns in dependence on a use purpose. A desired covering yarn may be wound on the core yarn in a condition different in the elongation of the core yarn to exhibit a characteristic action effect. The multi-stage covered elastic yarn may be subjected to a thermal set treatment to reduce a torque caused by the non-elastic covering yarn. The multi-stage covered elastic yarn is suitable for knitting clothes, especially stocking products.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new type of coated elastic yarn in which a plurality of inelastic coated yarns of the same or different kind are wound on a core yarn made of an elastic fiber as a plurality of separate coated yarns in a plurality of stages. It is particularly suitable for women's stockings and zokki knitted products.

[0002]

2. Description of the Related Art A conventional coated elastic yarn is a unidirectional single coated elastic yarn in which one inelastic fiber is wound around an elastic fiber serving as a core yarn as a coating yarn, that is, a so-called single covering yarn. Two types of crossed double-covered elastic yarns, so-called double-covering yarns, in which two yarns of elastic fiber are wound in opposite directions as separate covering yarns, are widely used for clothing mainly for women's stockings. Was used.

[0003] Of these, the single covering yarn is formed by winding a fine-fiber nylon yarn or a nylon twisted yarn as a covering yarn around a polyurethane fiber core yarn and knitting it into a woman's stockings such as pantyhose. It has a soft touch and excellent elasticity. However, in the case of single covering yarn, the wound covering yarn is easy to move, and the wrapping yarn becomes entangled due to the torque generated by the winding, and the winding of the covering yarn becomes uneven, resulting in a knitted product. As a result, fine sesame granular shading was sometimes generated. In order to solve the above-mentioned problem, a method of setting the winding density to a high level is used, but as a result, a high twist is applied to the coated yarn, the torque is increased, and liability is likely to occur, and the durability of the product is increased. There was a strong tendency for sex to decrease.

On the other hand, a double covering yarn is wound with two yarns such as fine-fiber nylon yarns crossing each other in opposite directions, and is required to have high durability, tightness or uniformity such as high-grade women's stockings and women's girdle. It is often used for high-grade products. In the double covering yarn, since the covering yarn is wound so as to cross in the facing direction, there is a feature that the position stability of the covering yarn is good, the covering uniformity is improved, and the elongation stress is high. However, the resistance at the time of contraction is large, the elastic shrinkage is inferior, the tightening force is large, but the elasticity is insufficient, and the upper winding yarn is restrained by the lower winding yarn in the opposite direction torque, and it is soft but soft. Tended to lack a natural feel.

[0005] In addition, as a problem common to all the coated elastic yarns, the width and length of the stitch of the knitted fabric product fluctuate, and unevenness due to the connection of the fluctuation occurs.
There are basic disadvantages that reduce the uniformity of the knitted fabric. The deviation of the single covering yarn is caused by the variation of the shape of the stitch loop of the coated elastic yarn due to uneven coating of the coating yarn, and that of the double covering yarn is changed by the lack of expansion and contraction flexibility of the stitch loop. It is believed that.

[0006] In recent years, knitting is performed only with a coated elastic yarn.
So-called Zocchi knitting stocking products have come to be welcomed. However, it is difficult to set the finish of a knitted knit product using the conventional coated elastic yarn. For example, it is difficult to sufficiently shape a footprint of a stocking product, and the finished size of the product tends to be small. There is a problem that needs to be solved, such as impairing the appearance of the device, making it difficult to wear, and easily breaking when worn. For this reason, attempts have been made to lower the elongation ratio of the elastic fibers during coating, or to use thermoplastic elastic fibers, but this also reduces the fastening force of the knitted fabric and reduces the support of stockings. There was a problem such as loss, and the problem as a material for knitting remains.

[0007] Further, if it becomes possible to use a new type of coated elastic yarn having different characteristics by using a combination of different types of fibers with the coated yarn, the applications of the coated elastic yarn will be expanded by adding new ones. It is expected. In the conventional single covering yarn, there was an attempt to use a yarn obtained by twisting and twisting different fibers into a covering yarn to simultaneously exhibit the characteristics of each fiber. The characteristics of each fiber could not be effectively brought out, such as a deviation in the arrangement between the surface and the inner surface within the plying yarn due to convergence. Also, in the conventional double covering yarn, even if the lower winding yarn and the upper winding yarn are coated with different kinds of fibers, in most cases, the characteristics of the lower winding yarn cannot be realized. It has been difficult to specifically realize the effect of combining different kinds of fibers.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the coated elastic yarn. That is,
Maintains the features of the conventional single covering yarn, such as the flexible elasticity and soft touch, or the features of the conventional double covering yarn, such as uniform coverage and high durability, which do not cause shading, and is also close at hand and cut core. It has been completed as a result of research on a coated elastic yarn having no damage and high durability, and a coated elastic yarn which can be preferably used also for knitting, and a manufacturing method and a manufacturing device thereof.
Furthermore, in the present invention, in addition to the above-mentioned problems, another object of the present invention is to commercialize a new coated elastic yarn having different characteristics by using different types of fibers in combination with the coated yarn.

[0009]

The present invention will be described below with reference to the drawings schematically showing an embodiment. In the present invention, the wrapping density (turns / m) of the coated yarn is determined by applying a tension of 0.2 g per 1 denier of fineness of the non-stretched elastic fiber to a length of 1 m of the stretched coated elastic yarn per m in length. It is the number of times the yarn is wound.

First, in the present invention, a plurality of inelastic covering yarns of the same kind or different kinds are wound around the core yarn 1b made of a non-twisted elastic fiber as a plurality of separate covering yarns 2b and 3b in a plurality of stages in the same direction. A multi-stage coated elastic yarn is provided. It is desirable that the sum of the differences in the winding density between the coated yarns does not exceed 1,000 turns / m.

[0011] Further, a core yarn made of non-twisted elastic fiber is
A plurality of inelastic coated yarns of the same or different types are wound in two directions, left-handed and right-handed, and a plurality of coated yarns are wound in multiple stages as separate coated yarns in either or both directions. A multi-stage coated elastic yarn characterized by having a plurality of inelastic coated yarns of the same type or different types wound on the core yarn made of non-twisted elastic fibers as a separate coated yarn in a plurality of stages in the same direction. And a multi-stage coated elastic yarn characterized in that one or more non-elastic coated yarns are inserted as coated yarns in a direction opposite to the winding direction between the wound stages. provide.

In the multi-stage coated elastic yarn according to the present invention, a unique effect can be achieved by winding the required inelastic coated yarn around the core yarn under the condition that the elongation rate of the core yarn is different. It is also possible to apply a heating set to reduce the torque due to twisting of the inelastic coated yarn. The multi-stage coated elastic yarn of the present invention is suitable for knitting clothing and the like, especially stocking products.

The present invention further provides a preliminary elongation while rotating an elastic fiber bobbin serving as a core yarn to draw out elastic fibers, and sequentially applying an appropriate elongation ratio to the drawn out elastic fibers to obtain the same type or different types. A plurality of inelastic coated yarns are sequentially wound in a plurality of stages in a predetermined winding direction to form a multi-stage coated elastic yarn,
Provided is a method for producing a multi-stage coated elastic yarn, which is wound around a bobbin.

According to the present invention, the elastic fiber bobbin 14 is rotated to draw out the elastic fiber 15, and the elastic fiber drawer 11 for applying the pre-elongation, the elastic fiber provided for the pre-elongation are passed through the axis, and the covering yarn is provided. When the bobbin 16 is fitted and rotated, at least three hollow spindles 18 provided in series for coating the elastic fiber while unraveling the coating yarn 17, and the multi-stage coated elastic yarn 19 passed through the hollow spindle And a winding unit 13 that winds the multi-layer coated elastic yarn around a winding bobbin 21 at a constant speed. Provided is a multi-stage coated elastic yarn manufacturing apparatus.

Further, the present invention provides a multi-stage coated elastic yarn manufacturing apparatus capable of changing the core yarn under stretch coating to a desired elongation ratio in an intermediate step and winding the coated yarn. In other words, the elastic fiber bobbin 34 is rotated to draw out the elastic fiber 35, and the elastic fiber drawer 31 for giving the pre-elongation;
By passing the pre-stretched elastic fiber through the shaft center and rotating with the covering yarn bobbin 36 fitted, the covering yarn 3
7. A plurality of hollow spindles 38 provided in series for covering the elastic fiber while separating 7 and a plurality of elongation take-off rolls 40a provided after the predetermined hollow spindles 38b and 38d to take off the coated elastic yarn 39 at a predetermined elongation magnification. , 4
0b, and a winding section 33 that winds the multistage coated elastic yarn around the winding bobbin 41 at a constant speed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described with reference to the drawings. FIG. 1 (a) shows a conventional general single covering yarn, and FIG. 2 (c) shows a conventional single covering yarn using three ply twisted yarns 2c as a covering yarn.
FIG. 1 (b) is a multi-stage (two-stage) coated elastic yarn of the present invention in which two yarns 2b, 3b are wound in two stages in the same direction, and FIG. 2 (d) is a three- yarn coated yarn 2d, 3d. And FIG. 4d are schematic enlarged views of a multi-stage (three-stage) coated elastic yarn of the present invention in which three stages are wound in the same direction.

There is no need to prepare a special material for the core yarn and the covering yarn of the multi-stage covering elastic yarn of the present invention, and the yarn used for the conventional type covering elastic yarn can be used. Polyurethane yarn is usually used for the elastic fiber of the core yarn, and nylon 6 or nylon 66 filament, nylon temporary twisted yarn, other synthetic fibers, regenerated fibers, natural fibers, and the like are used for the inelastic coated yarn.

In the present invention, the elastic fiber serving as the core yarn is non-twisted. The purpose of using the word “no twist” in the present invention is to clarify the distinction between a ply-coated elastic yarn formed by actively twisting the elastic fiber of the core yarn and the inelastic coated yarn. In the present invention, the use of an elastic fiber having a degree of twist (alternate twist or the like) of a degree permitted by a conventionally used core yarn is used in a narrowly defined coated elastic yarn formed by winding a coating yarn around the surface of a core yarn. It is not excluded.

First, the simplest form of the multi-stage coated elastic yarn of the present invention will be described with reference to FIG. FIG. 1 (b) shows the simplest form of the present invention, in which the same inelastic fibers 2b and 3b of two yarns are used as separate covering yarns and divided into two stages in the same direction and have the same winding density. 2 is an example of the surface of a two-stage coated elastic yarn in the same direction coated with a core yarn 1b. FIG. 1 (a) shows the surface of a conventional coated elastic yarn obtained by winding a coated yarn 2a having twice the fineness (number of filaments) per one coated yarn illustrated in FIG. 1 (b) with one yarn. An example was given.

As can be seen from a comparison between the two, in the conventional coated elastic yarn, the filaments constituting the coated yarn 2a overlap and the exposed portion of the core yarn 1a is large. When the covering elastic yarn is relaxed and contracted, the covering yarn 2a is in a floating state, is likely to be displaced from the wound position, and the covering yarn filaments tend to overlap or become entangled.

On the other hand, in the same-direction two-stage covering elastic yarn of the present invention, all the covering yarns of a plurality of yarns are wound around the portion where the winding stress is small (portion having a small diameter), and the winding stress is large. Since it is difficult to wind around a certain portion (a portion where the covering yarn becomes an overlapping winding), it is wound in parallel at an appropriate interval. Therefore, if the two covering yarns 2b and 3b are separately wound around the core yarn 1b, the overlapping of the filaments is small and the covering yarn 2
The interval between b and 3b is smaller than that of a conventional single-cover elastic yarn obtained by winding a covered yarn having a large fineness (in the present invention, unless otherwise noted, the total fineness) with one yarn. That is,
When the same amount (the same basis weight) of the covering yarn is wound per unit length of the core yarn, the covering ratio of the core yarn 1b is increased, and a uniform covering state is obtained. Even if the conventional single-cover elastic yarn can eliminate the overlap of the filaments and make the covering ratio the same with the same basis weight, the multi-stage coated elastic yarn of the present invention is such that the interval between the covering yarns 2b and 3b is a single-cover elastic yarn. Is about 1/2 or 1/3 of the coating yarn interval, and the uniform covering state and the durability are excellent. Even when the coated elastic yarns are relaxed and contracted, most of the overlapping and entanglement occurs between the two adjacent yarns due to the deviation of the floating of the coated yarns 2b and 3b, and a uniform knitted fabric can be obtained.

Although it depends on the fineness of the coated yarn and the number of filaments, it has been empirically determined that, for example, the same direction multi-stage coated elastic yarn of the present invention in which two yarns are coated in parallel has a winding density of a conventional single yarn winding density. It has been found that if the thickness is about 2/3, the same covering state as the conventional covered elastic yarn can be secured. Therefore, the coated elastic yarn of the present invention has a smaller torque due to twisting of the coated yarn, as compared with the conventional coated elastic yarn of the same covering state, and the displacement and entanglement are lightly contained and a uniform state is secured. it can. At the same winding density, the covering ratio is high and the exposed part of the core yarn is reduced to reduce the occurrence of core breakage, the unevenness and entanglement of the coated yarn is reduced, the coating is evened, and the stress concentration of the coated yarn is reduced. In addition, it further contributes to improving the durability of the product by reducing the twist.

In the case of a normal double covering yarn, two covering yarns are overlapped with an upper winding yarn and a lower winding yarn so as to intersect and interfere with each other. The coated yarn of the multi-stage coated elastic yarn has substantially no intersection with other coated yarns, and the coated yarn at the time of expansion and contraction has mutual interference with the adjacent coated yarn wound in the same direction, resulting in extremely slight expansion and contraction resistance. And has the same degree of elasticity as that of the conventional single covering yarn. Strictly speaking, there are some rotation fluctuations of the multi-stage spindle or slight fluctuations at the winding intersections, which cannot be said to be completely uniform. It does not result in large fluctuations. Then, the action of tightening the core yarn becomes small, and the coated elastic yarn does not coarsely harden and becomes rich in flexibility.

Although the multi-stage coated yarn has several cost-increasing factors in the manufacturing process, it has an effect of improving quality and excellent unique features, and is greatly excellent in overall economic efficiency.

[0025] By the improvement of the function and effect of the coated yarn described above, the touch feeling of the product knitted by using the multi-stage coated elastic yarn of the present invention is soft and excellent in stretch flexibility, and the difference in shade of sesame granules is eliminated. In addition, since the covering state of the covering yarn is uniform and the flexibility of forming the stitch loop is improved, it is possible to prevent the knitted product from being offset.

In the present invention, besides using the same kind of yarn as described above as a plurality of inelastic coated yarns separately wound around a core yarn, yarn form such as material, fineness, number of single yarns, bulkiness, etc., dyeability, absorption and removal Heterogeneous yarns having different characteristics such as wettability, antibacterial property, deodorant property, conductivity, and addition of radiation species can be used in any combination as a covering yarn. In the above-described multistage coated elastic yarn of the present invention, the coated yarn is wound around the surface of the core yarn in multiple stages, and the proportion of each coated yarn exposed on the surface is large. Accordingly, by arbitrarily combining characteristic coated yarns by using the multi-stage coated elastic yarn of the present invention, for example, by combining coated yarns having different dyeing properties, it is possible to express the depth of color by a different shade effect, or to use a conductive yarn. A novel effect can be provided by the combination of the filament and the antibacterial yarn.

There is no particular limitation on the number of stages of the covering yarn as long as practicality is not impaired. The co-directional multistage coated elastic yarn of the present invention illustrated in FIG. 2 (d) is a three-coated yarn 2d, 3d, 4d.
Is wound around the core yarn 1d in three stages. Conventionally, for example, in order to produce a combination effect of different yarns, FIG.
As shown in the above example, a single cover yarn obtained by plying and plying these yarns and winding the core yarn 1c as one covering yarn 2c has been used. Each coated yarn 2 shown in the above (d)
By d, 3d, and 4d being wound in multiple stages at the same winding density as the above-mentioned conventional covering yarn 2c, the uniformity of covering, the high covering property, and the effect of combining different kinds of yarns are enhanced as compared with the conventional single cover. be able to.

The winding density of each covering yarn is not limited to the same. However, in the above-mentioned multidirectional coated elastic yarn of the present invention, the sum of the differences in the winding densities of the coated yarns is 1,000 turns /
The effect is greatly exhibited in a range not exceeding m, and is particularly effective at 800 times / m or less. Here, the sum of the differences in the winding densities, that is, the density at which the covering yarns intersect, is, for example, when the covering yarn is three yarns of A, B, and C, each winding of A and B, A and C, and B and C Refers to the sum of the differences in coverage.
As the sum of the differences in the winding densities increases, some of the features of the above-described multi-stage coated elastic yarn of the present invention wound in the same direction are reduced, and properties intermediate to the conventional double cover yarn become dominant. .

According to the multistage coated elastic yarn of the present invention, one or a plurality of coated yarns may be wound in the direction intersecting with the coated yarn wound in multiple stages around the core yarn depending on the purpose of use. For example, one covering yarn is wound around the core yarn, and two covering yarns are further crossed in the direction intersecting the first stage and the second stage.
Two-way (intersecting type) multi-stage coated elastic yarns arranged as stages and separately wound and coated can be used. in this case,
Although there is a little lacking in stretch flexibility compared with the multi-stage coated elastic yarn of the present invention in which all the coated yarns are wound in the same direction, the first-stage and second-stage coated yarns wound in multiple stages are exposed, It is possible to obtain a multi-stage coated elastic yarn having excellent soft texture and uniformity.

Conversely, for example, an appropriate covering yarn is selected, the first, second, and third stages are arranged in the same direction and wound in multiple stages, and the winding density is further reduced in a direction intersecting this. Then, the coated yarn can be wound by one thread, and a crossed multi-stage coated elastic yarn can be manufactured which appropriately exhibits soft touch, stretch flexibility, uniformity of coating, uniformity of stitches, and characteristics of heterogeneous fibers. . For example, 2,000 times / m in the same direction,
With a winding density of 2, and 1,700 turns / m in the cross direction
The cross-type multi-stage coated elastic yarn with two windings at a winding density of higher than that of the double covering yarn that has high covering properties and the twist of the coated yarn is smaller than that of the double covering yarn wound with the same twist. Could be improved.

Further, in the multi-stage coated elastic yarn of the present invention, the winding direction of the coated yarn can be changed a plurality of times according to the purpose of use, and the multi-stage crossed elastic yarn can be crossed. For example, when winding two multi-stage covering elastic yarns separately around the right-hand winding two covering yarns, the right winding 1
One covering yarn can be inserted in the left-hand winding between the first and second stages. In addition, two stages of left-hand winding and two stages of left-hand winding are inserted alternately, or two stages of left-hand winding are inserted between two stages of right-hand winding and two stages of the covering yarn of two yarns separately. It may be wound. In the case of the multi-stage coated elastic yarn intersecting in multiple stages as described above, it is often inevitable that the characteristics of the multi-directional coated elastic yarn of the same direction type decrease, but on the other hand, resistance to shrinkage, nylon yarn, etc. It is possible to improve the heat shaping property of the thermoplastic fiber. Therefore, for example, it is possible to obtain a stocking having a required last shape and a product placing size. If the stocking is used for a stocking knitted stocking product, a product having a good appearance and excellent supportability can be manufactured.

Further, in each of the above-described multi-stage coated elastic yarns of the present invention, by winding the respective coated yarns while appropriately changing the elongation ratio of the core yarn, for example, in the case of a two-stage coated elastic yarn, By changing the elongation ratio of the core yarn between the second stage and the second stage, a unique effect can be exhibited. If an apparatus of the same type as that illustrated in FIG. 4, which will be described later, is used, the covering yarn can be wound at a required stage while changing the extension ratio of the core yarn. By using this method, for example, the elongation of the coated elastic yarn is suppressed by the coated yarn that is coated in the lowest elongation state, and the coated yarn that is coated in the further expanded state is maintained in a relaxed and lifted state. As compared with the coated elastic yarn, the soft touch feeling and the bulkiness of the coated yarn are increased, and the characteristics of the raised fiber appear strongly, so that a knitted fabric of unique quality can be manufactured.

Further, if the multi-stage coated elastic yarn is heated and set at the time of manufacture and heat-fixed, the torque caused by twisting of the coated yarn can be reduced. In particular, the high torque property of the multi-stage coated elastic yarn of the same direction type and the collapse of the torque balance of the cross-type multi-stage coated elastic yarn are reduced by the heating set, so that the coated elastic yarn having a good knitting property for knitting can be obtained. The optimum value of the heat setting temperature differs depending on the type and fineness of the coated yarn. However, from the viewpoint of the heat setting effect and the prevention of thermal deterioration of the polyurethane elastic fiber, the heat setting temperature is from 160 ° C to 205 ° C.
° C, preferably 170 ° C to 195 ° C. By heat setting, the form of the coated yarn is stabilized, and a knitted fabric with good uniformity can be processed. A multi-stage coated elastic yarn wound in the same direction and produced at a high winding density has extremely high torque, and there is a high risk of occurrence of knitting during knitting.However, by applying a heating set to reduce the torque, extremely high quality A knit is easily obtained.

The multi-stage coated elastic yarn described above, for example, gives a preliminary elongation while pulling out the elastic fiber by rotating a bobbin of the elastic fiber serving as a core yarn, and sequentially applies an appropriate elongation to the drawn out elastic fiber. While imparting a magnification, a plurality of non-elastic coated yarns of the same or different types are sequentially wound in a plurality of stages in a predetermined winding direction to form a multi-stage coated elastic yarn, which is preferably wound around a bobbin to be manufactured. The multi-stage coated elastic yarn of the present invention is mainly used for knitted clothing, especially stocking products,
Particularly suitable for pantyhose and other women's stockings.

The means for producing the multistage coated elastic yarn of the present invention will be specifically described. Among the above-mentioned multi-stage coated elastic yarns of the present invention, a simple two-stage winding method in which two inelastic coated yarns of the same or different kind are wound around the core yarn traveling at the same elongation rate in two stages.
The step-covered elastic yarn can be manufactured using a conventional double-covering-coated elastic yarn manufacturing apparatus schematically illustrated in FIG. However, in order to wind three or more covering yarns, it is preferable to use a multistage covering elastic yarn manufacturing apparatus of the same type as schematically illustrated in FIGS.

As a preferred basic device for producing the multi-stage coated elastic yarn of the present invention, there is a multi-stage coated elastic yarn production device illustrated in FIG. The apparatus illustrated in FIG. 3 has a main part composed of an elastic fiber pull-out part 11, an extension covering part 12, and a winding part 13, which are provided with a control mechanism, a measuring device, and the like (not shown).
Comes with. First, while rotating the bobbin 14 of the elastic fiber used for the core yarn in the elastic fiber drawer 11, the elastic fiber 15 is drawn out by the pre-stretched drawer roll 22,
Give pre-stretch. Next, at least three hollow spindles 18 (three are mounted in the apparatus of FIG. 3) are mounted in series on the extension coating section 12, and these hollow spindles 18 have the same type and / or different type of coating, respectively. When the bobbin 16 of the yarn is fitted, the pre-stretched elastic fiber is passed through the axis of the hollow spindle 18 and once rotated, the covering yarn 17 is sequentially covered with the elastic fiber while being unraveled. The multi-stage coated elastic yarn 19 that has passed through the hollow spindle 18 is taken up by a stretching take-up roll 20 at a predetermined stretching magnification. The taken-up multi-stage covered elastic yarn is wound around the winding bobbin 21 at a constant speed in the winding section 13. By setting the rotation direction and the rotation speed of each spindle 18 to a required state, various multi-stage coated elastic yarns can be easily manufactured.

FIG. 4 exemplifies an apparatus suitable for producing the multistage coated elastic yarn of the present invention in which a required coated yarn is wound while changing the elongation of the core yarn. In the example apparatus of FIG.
A plurality (four in this example) of hollow spindles 38a-d are arranged in series to wind the covering yarn around the extension covering portion 32,
It is mounted, and after predetermined hollow spindles 38b and 38d, extension take-off rolls 40a and 40b are arranged and mounted. That is, the multi-stage coated elastic yarn manufacturing apparatus shown in FIG. 4 draws the elastic fiber 35 while rotating the elastic fiber bobbin 34, and provides the elastic fiber drawer 3 for applying the preliminary elongation.
1 and four elastic fibers provided in series to cover the elastic fiber while unwrapping the coated yarn by passing the pre-elongated elastic fiber through the shaft center and rotating by fitting the coated yarn bobbin 36 and rotating. Hollow spindle 38 and hollow spindle 3
The second spindle 38b and the third spindle 38
c, an elongate covering portion 32 composed of an elongate take-off roll 40a arranged in the middle of the third spindle 38d and an elongate take-off roll 40b arranged after the fourth spindle 38d, and winding up the multi-stage covered elastic yarn onto the take-up bobbin 41 at a constant speed. And a unit 33.

Further, FIG. 5 shows an example of a multi-stage coated elastic yarn manufacturing apparatus which can heat-set a multi-stage coated elastic yarn obtained by winding a required coated yarn around a core yarn. The device illustrated in FIG.
In order to heat-set the multi-stage coated elastic yarn 59 for which the coating yarn has been wound, a heating plate 63 is mounted in the next step of the extension take-off roll 60a. Final coated yarn spindle 58d
Is completed, and the coated elastic fiber 59 that has been drawn at a predetermined elongation ratio by the elongation take-off roll 60a is heated by the heating plate 63 and subjected to heat setting. FIG. 6 shows an example of a conventional double covering elastic yarn manufacturing apparatus, which can be used for manufacturing the same-direction two-stage coated elastic yarn which is the most basic form of the multistage coated elastic yarn of the present invention. .

[0039]

Next, the present invention will be specifically described with reference to examples. Wearing evaluation of pantyhose or tights in the examples and comparative examples of the present invention described below, a pantyhose or tights were prototyped using the coated elastic yarn produced in each example, and 10 pairs were extracted from each. For 6 days and evaluated. Note that the core breakage in the durability evaluation includes one that has been overlapped with another break. The evaluation method has a part based on the subjectivity of the try-on person.

First, an embodiment of a multi-stage coated elastic yarn in which the same or different types of coated yarns are wound in the same direction at the same winding density while the core yarn has the same elongation rate, and a co-directional multi-stage coated elastic yarn formed by different types of coated yarns 1 to 5 and Comparative Examples 1 to 4 relating to a conventional coated elastic yarn will be described.

Example 1 Using the same double covering machine as illustrated in FIG.
With the same spindle rotation direction, the 18-denier non-stretch polyurethane elastic fiber is stretched 2.6 times as a core yarn, and the same direction as two yarns of 5 denier and 5 filament nylon 6 yarns as a covering yarn. 2,200 times / m separately
The core yarn was coated at a winding density of 2 to produce a two-stage coated elastic yarn having the same winding density in the same direction. At the same time, a two-stage coated elastic yarn in the same direction wound under the same conditions but in the opposite direction was also manufactured. In each of the following examples, right-handed and left-handed co-directional multi-stage coated elastic yarns were produced.

Example 2 Under the same conditions as in Example 1, except that two coated yarns were separately coated at a winding density of 1600 turns / m in the same direction to produce a two-stage coated elastic yarn in the same direction. did.

Example 3 A three-stage coated elastic yarn manufacturing apparatus of the same type as illustrated in FIG. 4 (a) was used, under the same conditions as in Example 1, except that three coated yarns were used and the same. The core yarn was coated at a winding density of 2,200 turns / m in the direction to produce a three-stage coated elastic yarn in the same direction.

Example 4 A multi-stage coated heat-set elastic yarn manufacturing apparatus equipped with the same three-stage coating and a heating plate for a heating set as illustrated in FIG. 5 was used under the same conditions as in Example 3, except that the core was used. After stretching the polyurethane elastic fiber of the yarn three times and winding the covered yarn, one more
A heating set was applied by a heating plate maintained at 80 ° C., and heat setting was performed to produce a low-torque three-stage coated elastic yarn in the same direction.

Example 5 Using the same double covering machine as illustrated in FIG.
The same direction of spindle rotation is used, and a 15-denier non-twisted polyurethane elastic fiber is stretched three times as a core yarn to form a core yarn, a 6-denier 10-denier 7-filament nylon yarn and a second-stage coating yarn. A nylon 66 false twisted yarn of 20 denier and 20 filaments is used for the yarn, and the former is coated at a winding density of 1,200 turns / m and the latter at a winding density of 800 turns / m in the same direction. A step-coated elastic yarn was produced.

Comparative Example 1 Using a normal single covering machine, the same core yarn as in Example 1 was run under the same elongation conditions, and a nylon 6 yarn of 10 denier and 10 filaments was used as a coating yarn at 2,200 times / m. Winding was performed at a winding density to produce a coated elastic yarn (single).

Comparative Example 2 In the same manner as in Comparative Example 1, except that the coated yarn was coated at a winding density of 1,600 turns / m to produce a coated elastic yarn (single).

Comparative Example 3 In the same manner as in Comparative Example 1, except that three denier and five filament nylon 6 yarns were twisted to form a 15 denier and 15 filament yarn, which was used as a coating yarn.
The core yarn was coated at a winding density of m to produce a coated elastic yarn (single).

Comparative Example 4 In the same manner as in Comparative Example 1, a 15 denier polyurethane elastic fiber was stretched three times to obtain a core yarn, and a 10 denier, 7 filament nylon 6 yarn and a 20 denier, 2 yarn.
25 tons of 0 filament nylon 66 false twisted yarn
/ M twisted to obtain a coated yarn, 1,000 times / m
To produce a coated elastic yarn (single). Comparative Example 5 Using the double covering machine illustrated in FIG. 6, a 10-denier 7-filament nylon 6 yarn is used for the lower-layer covering yarn, and a 20-denier 7-filament is used for the upper winding covering yarn under the same conditions as in Comparative Example 4. Using a nylon 66 false twisted yarn of 20 filaments, the former was wound in the reverse direction at a winding density of 1,200 turns / m and the latter was wound 800 times / m to produce a coated elastic yarn of double covering.

Using the coated elastic yarns produced in the above Examples 1 to 5 and Comparative Examples 1 to 4 and the coated elastic yarns produced by the same reverse winding, the legs are alternately knitted and processed into pantyhose or tights. did. Table 1 shows the results of evaluating the touch, the degree of adhesion to the legs, the uniformity of the knitted fabric, and the wearing durability of these products.

Products such as stockings knitted by using the multi-stage coated elastic yarns of Examples 1 to 5 are very soft to the touch as compared with those of the comparative example, and have less slack in the ankle and the back of the knee. Features such as little unevenness of the knitted fabric were observed, and furthermore, the core of the elastic yarn did not break and the improvement in durability was conspicuous. Also,
When the above-mentioned products were compared between Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, and Example 3 and Comparative Example 3, the knitted fabrics were almost the same, but the knitted fabric was manufactured in Examples. The knitted fabric using the coated elastic yarn thus obtained was uniform, had little occurrence of twitching, etc., and was excellent in durability. The multi-stage coated elastic yarns produced in Examples 3 and 4 were all subjected to high-density winding, but there was no problem in knitting, and when the knitted fabric was compared with the knitted fabric according to Comparative Example 3, it was soft. There was no noticeable soft and sesame granular shading or stitch donation.

In particular, the stocking product using the multi-stage coated elastic yarn produced by performing the heat setting in Example 4 showed a greatly improved uniformity and a sufficient heating setting effect. On the other hand, the tights product knitted with the multi-stage coated elastic yarn of Example 5 manufactured using two types of coated yarns has an extremely soft feeling, has a subtle downy feel, and has a deep color tone. It was a high-grade product with good coloring properties, which is important as a tights product.

Next, an embodiment of a cross-type multistage coated elastic yarn of the present invention comprising a coated yarn wound in multiple stages in the same direction with the same elongation rate of the core yarn and a coated yarn wound in the opposite direction. 6 to 8 and Comparative Examples 6 and 7 relating to a conventional coated elastic yarn will be described.

Example 6 Using the same three-stage coated elastic yarn manufacturing apparatus as illustrated in FIG. 3, a 20-denier polyurethane elastic fiber was extended 3.2 times to form a core yarn, and the first and second stages were used. 5 denier 5
The two nylon 6 yarns of the filament are separately wound in the same direction at a winding density of 1,600 turns / m, respectively, and the same nylon 6 yarn is wound in the opposite direction to the first and second stages at a winding density of 2,2. 0
A cross-type multistage coated elastic yarn wound at 00 turns / m was produced.

Example 7 Using a four-stage coated elastic yarn manufacturing apparatus equipped with four coated yarn winding spindles in series, the first and second coated yarns were wound in the same direction as in Example 6. . Then, the same two nylon 6 yarns were separately wound in two steps at a winding density of 1,400 turns / m in the opposite direction to the above to produce a multistage coated elastic yarn having two steps in each of the cross directions.

Example 8 In the same manner as in Example 7, except that the first and second coating layers were made of nylon 6 of 5 denier and 5 filaments, respectively.
No. 6 was wound in the same direction at a winding density of 2,000 turns / m. And the same nylon 66 thread 1 thread and 5 denier
One 5-filament nylon 6 yarn was separately wound in the opposite direction to the above at a winding density of 1,700 turns / m, respectively, to produce two-stage multi-stage coated elastic yarns in the cross direction.

Comparative Example 6 Using the same double covering machine as shown in FIG. 6, a nylon 6 yarn of 10 denier and 10 filaments was wound around the same core yarn used in Example 6, and the winding density was 2, 400 turns / m, upper winding is wrapping density of 2,000 in the opposite direction to lower winding.
Twist / m was wound to produce a conventional type double covering yarn.

COMPARATIVE EXAMPLE 7 As in Comparative Example 6, the lower winding of the coated yarn was made of 10-denier, 10-filament nylon 66 yarn at a winding density of 2,800 turns / m. 10 in the opposite direction
A nylon 6 yarn of 10 denier filaments was wound at a winding density of 2,400 turns / m to produce a conventional double covering yarn.

Each of the coated elastic yarns produced in Examples 6 to 8 and Comparative Examples 6 and 7 was used alone for a leg portion.
Pantyhose was processed. Table 2 shows the results of evaluating the touch, the degree of adhesion to the legs, the uniformity of the knitted fabric, and the durability during wearing. Example 6 ~
All of the cross-type multi-stage coated elastic yarns of No. 8 exhibited a sufficient coating performance although the winding density of the single yarn was low, and were evaluated excellent in uniformity and durability of the knitted fabric. Example 8
The pantyhose using the multi-stage coated elastic yarn showed a good color tone in which the depth of the color was felt due to the expression heterodye effect of the two yarns of the hetero-dyed fibers used in the coated yarn.
The difference was remarkable compared to the seven. Further, with regard to the tactile sensation, in particular, Example 7 was excellent in softness, but it is presumed that the lower number than the winding of the covering yarn contributed.

Examples 9 to 11 of the multistage coated elastic yarn of the present invention comprising a coated yarn wound in multiple stages in the same direction with the same elongation rate of the core yarn and a coated yarn wound in the opposite direction. , And Comparative Examples 8 and 9 relating to a conventional coated elastic yarn.

Example 9 Using the same four-stage coated elastic yarn manufacturing apparatus used in Example 7, a 30-denier polyurethane elastic fiber was stretched 3.3 times to obtain a core yarn of 5 denier and 5 filaments. Using a nylon 6 yarn as a covering yarn, the winding density is 1,000 turns / m on the first stage, and 1,800 turns / m on the second and third stages, respectively.
A total of three yarns are further inserted between the first stage and the second stage, and the same nylon 6 yarn is inserted in the opposite direction at a winding density of 2,000 times / m. Winding produced a multi-stage coated elastic yarn.

Example 10 As in Example 9, except that the winding density was 2,000.
Times / m, 1,400 times / m, 1,800 times / m, 2.0
Two turns were wound alternately in the reverse direction in the order of 00 turns / m to produce a cross-type multistage coated elastic yarn.

Example 11 In the same manner as in Example 9, except that the same three nylon 6 yarns were wound at a winding density of 1,600 turns / m and 1,4
00 turns / m, 2,000 turns / m
Further, the same nylon 6 yarn as above was wound in the opposite direction at a winding density of 1,600 turns / m as a covering yarn to produce a multi-stage covering elastic yarn.

Comparative Example 8 Using the same double covering machine as illustrated in FIG. 6, the same core yarn having the same elongation ratio as that used in Example 9 was coated with a nylon 6 yarn of 10 denier and 10 filaments as a covering yarn. Double winding was performed at a lower winding density of 3,000 turns / m, and in the opposite direction, an upper winding density of 2,550 turns / m to produce a double-covered yarn having a higher winding density.

Comparative Example 9 In the same manner as in Comparative Example 8, except that the elongation ratio of the core yarn was doubled, the lower winding density was 2,400 turns / m, and the upper winding was Double covering was performed at a coating density of 2,000 times / m to produce a low-elongation double covering yarn.

The above Examples 9 to 11 and Comparative Examples 8 and 9
Each of the coated elastic yarns manufactured in the above was used alone for a leg portion to process pantyhose. Table 3 shows the results of evaluating the touch, the degree of adhesion to the legs, the uniformity of the knitted fabric, and the wearing durability of these products.

In the pantyhose using the multi-stage coated elastic yarn produced in Examples 9 to 11, the shape of the last and the size of the last associated with the finishing set are close to a predetermined value, and the pantyhose is supported. It was also excellent in properties and had a shape and characteristics that were close to ideal as a stocking knitting stocking product. Further, the stocking of Example 9 had a soft touch and a good texture because the upper layer coating was made of two threads in parallel.

Examples 12 to 14 of the present invention in which the core yarn for winding the covering yarn is adjusted to a required elongation will be described. Example 12 Using a two-stage stretched four-stage elastic yarn manufacturing apparatus of the same type as illustrated in FIG. 4, a 15-denier polyurethane elastic fiber was used as a core yarn, and the core yarn was first set in the first half of the stretch-coated take-up section.
The yarn is stretched 6 times, and coated with a nylon 66 false twisted yarn of 20 denier and 20 filaments at a winding density of 700 turns / m. A 10 denier, 7 filament nylon 6 yarn is wound in the same direction as the first stage with a winding density of 1,200 turns /
m to produce a two-step stretched, co-directional two-step coated elastic yarn.

Example 13 In the same manner as in Example 12, except that the core yarn was stretched 3.6 times at the stretched coating take-up section in the first half, and a 10-denier, 7-filament nylon 6 yarn was wound as the first stage. Density 1,000
Twist / m, as the second stage, a nylon 66 false twisted yarn of 20 denier and 20 filaments is wound in the same direction at a winding density of 700 turns / m, and the coated elastic yarn is stretched to 80% in the latter half of the stretched coating take-up section. Then, 10 denier 7 filament nylon 6 yarn was wound in the opposite direction to the above-mentioned coated yarn at a winding density of 800 turns / m to produce a cross-type two-stage extended multi-stage coated elastic yarn.

Example 14 In the same manner as in Example 13 except that the winding density of the first-stage nylon 6 yarn was 600 turns / m in the first half of the stretch coating take-up section.
The winding density of the nylon 66 false twisted yarn is 400 turns / m at the stage, and the coated elastic yarn is 75%
In the third stage, a 10-denier 7-filament nylon 6 yarn is wound in the same direction as the above-mentioned coated yarn at a winding density of 600 times / m, and in the fourth stage, 20 denier-2
A zero-filament nylon 66 false twisted yarn was wound at a winding density of 400 turns / m to produce a two-stage stretched multi-stage coated elastic yarn.

The leg portion is knitted (alternate knitting with the one in the direction opposite to the winding direction) using only the multi-stage stretched and multi-stage coated elastic yarns produced above, and processed into tights. evaluated. The tights using the multi-stage coated elastic yarns manufactured in Examples 11 to 13 were all bulky, tactile, and rich in the wearing extended state compared to the tights using the coated elastic yarns manufactured in Comparative Example 4. A tights product with excellent color properties and an unprecedented sense of quality was obtained. Note that the multi-stage coated elastic yarn of Example 13 was excellent also in productivity.

[0072]

[Table 1]

[0073]

[Table 2]

[0074]

[Table 3]

[0075]

[Table 4]

[0076]

The multi-stage coated elastic yarn of the present invention is superior to conventional coated elastic yarns in softness, bulkiness, stretch flexibility, uniformity of the knitted fabric, durability and the like. In addition, there is great applicability to manufacture the coated elastic yarn suitable for each purpose of use by appropriately selecting the conditions for winding the coated yarn, the conditions of the core yarn for winding, and the manufacturing conditions such as heat setting. Further, it is possible to select and combine different kinds of yarns having characteristics, and to bring out the characteristics of each yarn. This is the case for women's stockings, including pantyhose and tights, and can be preferably used for zokki knitting, which has recently attracted attention.

[Brief description of the drawings]

FIG. 1A is an enlarged view of a conventional single-covering elastic yarn. FIG. 1B is an enlarged view of the same-direction multi-stage (two-stage) coated elastic yarn of the present invention.

FIG. 2 (c) is an enlarged view of a conventional three-ply twisted single covering elastic yarn. (D) is an enlarged view of the same-direction multi-stage (three-stage) coated elastic yarn of the present invention.

FIG. 3 is an exemplary view of a multi-stage (three-stage) coated elastic yarn manufacturing apparatus.

FIG. 4 is an exemplary view of a multi-stage (four-stage) coated elastic yarn manufacturing apparatus provided with a core yarn extension applying roll between coated yarn spindles.

FIG. 5 is an exemplary view of a multi-stage (four-stage) coated elastic yarn manufacturing apparatus provided with a heating plate.

FIG. 6 is an exemplary view of a conventional double covering elastic yarn manufacturing apparatus.

[Explanation of symbols]

11: Elastic fiber draw-out part 12: Stretch coating part 1
3: winding section 14: elastic fiber bobbin 15: elastic fiber 1
6: Coated yarn bobbin 17: Coated yarn 18: Hollow spindle 1
9: Multi-stage coated elastic yarn 20: Extension take-up roll 21: Take-up bobbin 2
2: Pre-stretching draw-out roll 31: Elastic fiber drawing-out part 32: Stretch covering part 3
3: winding section 34: elastic fiber bobbin 35: elastic fiber 3
6: Coated yarn bobbin 37: Coated yarn 38: Hollow spindle 3
9: Multi-stage coated elastic yarn 40: Extension take-up roll 41: Take-up bobbin 4
2: Pre-stretch draw-out roll 51: Elastic fiber draw-out part 52: Stretch covering part 5
3: winding section 54: elastic fiber bobbin 55: elastic fiber 5
6: Coated yarn bobbin 57: Coated yarn 58: Hollow spindle 5
9: Multi-stage coated elastic yarn 60: Extension take-up roll 61: Take-up bobbin 6
2: Pre-extension draw roll 63: Heating plate 71: Elastic fiber bobbin 72: Pre-extension draw roll
73: elastic fiber 74: coated yarn bobbin 75: hollow spindle 7
6: Extension take-up roll 77: Take-up bobbin

Claims (10)

[Claims] 1. A core yarn (1b) made of a non-twisted elastic fiber.
A plurality of inelastic coated yarns of the same type or different types wound in a plurality of stages in the same direction as separate coated yarns (2b, 3b). 2. The method according to claim 1, wherein the sum of the differences in winding density between the coated yarns is 1,0.
2. The multi-stage coated elastic yarn according to claim 1, wherein the number does not exceed 00 times / m. 3. A plurality of inelastic coated yarns of the same type or different types are wound around a core yarn made of non-twisted elastic fibers in two directions, left-handed and right-handed, and in either or both directions. A multi-stage covering elastic yarn, wherein a plurality of covering yarns are wound in a plurality of stages as separate covering yarns. 4. A plurality of inelastic coated yarns of the same type or different types are wound on the core yarn made of non-twisted elastic fibers as separate coated yarns in a plurality of stages in the same direction, and wound as described above. A multi-stage coated elastic yarn, wherein one or more non-elastic coated yarns are inserted between the stages in a direction opposite to the winding direction as a coated yarn. 5. The multi-stage coated elastic yarn according to claim 1, wherein the coated yarn is wound around the core yarn under different conditions of the expansion ratio of the core yarn. 6. The multi-stage coated elastic yarn according to claim 1, wherein a heating setting is performed after winding the coated yarn. 7. A stocking product knitted using the multi-stage coated elastic yarn according to any one of claims 1 to 6. 8. An elastic fiber bobbin serving as a core yarn is rotated to draw out elastic fibers and to apply preliminary elongation, and to sequentially apply an appropriate elongation ratio to the drawn out elastic fibers, to obtain a plurality of same or different kinds of elastic fibers. Inelastic coated yarn is wound in multiple stages as separate coated yarns sequentially in a predetermined winding direction to form a multi-stage coated elastic yarn,
A method for producing a multi-stage coated elastic yarn, which is wound around a bobbin. 9. An elastic fiber bobbin (14) is rotated to draw out an elastic fiber (15), and an elastic fiber drawer (11) for applying a pre-elongation and an elastic fiber provided for a pre-elongation are passed through an axis. And at least three hollow spindles (18) provided in series for covering the elastic yarn while breaking the covering yarn (17) by fitting and rotating the covering yarn bobbin (16), and the hollow spindle An elongate covering part (12) comprising an elongating take-off roll (20) for taking up the multi-stage covered elastic yarn (19) having passed through at a predetermined elongation ratio.
And a winding section (13) for winding the multi-stage coated elastic yarn around the bobbin (21) at a constant speed. 10. An elastic fiber bobbin (34) is rotated to draw out an elastic fiber (35), and an elastic fiber drawer (31) for applying pre-elongation and an elastic fiber provided for pre-elongation are passed through an axis. A plurality of hollow spindles (38) provided in series, which cover the elastic fiber while unraveling the covering yarn (37) by fitting and rotating the covering yarn bobbin (36), and a predetermined hollow spindle ( 38b),
A plurality of elongation take-off rolls (40a) provided after (38d) for taking the covered elastic yarn (39) at a predetermined elongation ratio;
And a winding section (33) for winding the multi-step covering elastic yarn around a bobbin (41) at a constant speed. manufacturing device.