JP2004044039A - Method for producing ultrafine fiber textured yarn having elasticity and ultrafine fiber textured yarn having elasticity obtained therefrom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrafine fiber textured yarn not exhibiting a self-crimpable elastic function before carrying out heat treatment in dyeing and finishing, namely having excellent dimensional stability of yarn and exhibiting an elastic function capable of readily weaving. <P>SOLUTION: A thermoplastic fiber having a self-crimpable elastic function is adopted and ultrafine fiber is false-twisted by a compressed air jet apparatus and two kinds of materials are entangled and conjugated to prepare a high-class yarn having an elastic function. Thereby, production steps of the elastic conjugate yarn are simplified and production cost is reduced and excellent dimensional stability is imparted to the yarn, because the high-class yarn having the elastic function does not exhibit the self-crimpable elastic function before carrying out heat treatment of dyeing. As a result, the yarn is readily woven and suitable for spinning industry and textile industry and clothes made of the textured yarn is comfortable, compared with clothes made of a conventional ultrafine textured yarn not having elasticity. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a textured yarn having elasticity (Textured Yarn), and to a textured yarn having elasticity obtained from the method. Particularly, the present invention relates to a thermoplastic fiber having a self-winding elasticity function. At the same time, the ultra-fine fibers are false-twisted by a compressed air jet device, and at the same time, two types of materials are entangled and compounded to produce an ultra-fine fiber false-twist textured yarn having an elastic function. Exhibits elastic function.
[0002]
[Prior art]
As a conventional method for producing an ultrafine fiber false-twist textured yarn, Taiwan Patent No. 127812, "A method for producing a hetero-shrink ultrafine fiber false-twist textured yarn" is mainly used. A method is disclosed in which a textured yarn and a high-shrink low-crimp yarn having a boiling water shrinkage of 15% or more are subjected to composite processing to form a yarn. The woven fabric made of such a yarn has a feeling of thickness and drape, but has a problem that it has no elasticity and is not comfortable to wear.
[0003]
Further, among related manufacturers, a covering yarn having elasticity is obtained by winding the yarn around the outside of the LYCRA Spandex (trade name of polyurethane elastic yarn) in a mono / dual wrap system or by winding the yarn around the outside of the LYCRA Spandex using a high-speed air notter. ) Is also manufactured. Such yarns are elastic, but the manufacturing process is complicated and the production cost is high. In addition, polyurethane elastic yarn has the following disadvantages.
1. Raw materials and manufacturing techniques are complex and costly.
Because it is weak to humidity and heat, it is not suitable for high-temperature dyeing, and correction coloring tends to become brittle.
Weak against alkali (NaOH) weight loss processing.
2. If the elasticity is high, the tension in yarn twisting, weaving and dyeing becomes difficult to control, which makes the processing extremely difficult and affects the quality and efficiency of the product.
[0004]
In view of the above, the present inventor has actively conducted research and experiments on the processing technology and raw material selection for the problems of the above-mentioned various existing related products, and as a result of repeated testing and improvement, self-rolling crimped thermoplastic thermoplastic It has been found that a high-quality yarn having an elastic function, in which various kinds of elastic composite yarns are combined by combining fibers of two kinds and entangled at the same time by employing a fiber and twisting the ultrafine fiber with a compressed air jet device, is also discovered. This simplifies the manufacturing process of the elastic composite yarn and reduces the production cost. In addition, the high-quality yarn having the elastic function does not have the self-winding elastic function before heat treatment for dyeing is performed. It has excellent dimensional stability, is easy to weave, is suitable for the spinning industry and the clothing industry, and solves the problem that the conventional ultrafine fiber textured yarn has poor elasticity and is not comfortable to wear.
[0005]
[Brief description of the drawings]
The advantages of the present invention will be further described with reference to the drawings.
FIG. 1 is a flowchart of a composite false twisting process employed in the method for producing an elastic microfiber textured yarn according to the present invention.
FIG. 2 is a view showing a process for producing a thermoplastic fiber having self-winding elasticity in a method for producing an elastic microfine fiber textured yarn according to the present invention.
[0006]
Summary of the Invention
The ultrafine fiber false twist textured yarn used in the present invention is obtained by heating, false twisting, and post-processing continuous fibers spun by a method usually called a traditional spinning method or a composite spinning method in the synthetic fiber industry. The single yarn fineness is 0.5 denier or less.
[0007]
In a traditional spinning method, a single polymer material is spun into a continuous fiber having a single-fiber fineness of 0.5 denier or less after false twisting through a traditional spinning condition and equipment. By performing the false twisting process, it is possible to obtain an ultrafine fiber false twist textured yarn having a single yarn fineness of 0.5 denier or less.
[0008]
In the composite spinning method, two kinds of polymers of different materials are spun through known composite spinning conditions and equipment, and are subjected to false twisting and post-processing. And separating or melting the different components to obtain continuous fibers having a single-fiber fineness of 0.5 denier or less and false-twisting the continuous fibers. Twisted textured yarn can be obtained.
[0009]
Another type of material used in the present invention is a thermoplastic fiber having a self-winding crimp elastic function, and two kinds of thermoplastic polymers having different shrinkage rates are combined at an appropriate ratio and spun with a spinneret. The obtained thermoplastic polymers having different shrinkage rates are fibers arranged mutually in a fiber cross section, and the production plan is as shown in FIG. When hot water is brought into contact with the hot water during the dyeing process, the two materials are different in shrinkage rate, so that a difference in shrinkage stress forms a spring-like spiral between the interfaces to generate self-rolling elasticity.
[0010]
The method for producing a microfiber false twist textured yarn having an elastic function according to the present invention includes a continuous fiber spun out of a thermoplastic fiber having a self-winding elastic function by a traditional spinning method or a composite spinning method. Heating, false twisting and post-processing to obtain a textured yarn of ultrafine fiber false twist with a single fiber fineness of 0.5 denier or less. Combined to produce a false twist textured yarn, and through a woven fabric, utilizing the high temperature during processing in the process of dyeing and finishing, causing a difference in shrinkage in thermoplastic fibers with self-rolling crimping function, producing a woven fabric Some have an elastic effect.
[0011]
The method for producing an elastic microfiber textured yarn according to the present invention includes:
(1) means for heating and false-twisting continuous fibers spun by a traditional spinning method or a composite spinning method into a textured yarn, and obtaining a fine fiber false-twist textured yarn;
(2) means for melting and combining two types of thermoplastic polymers having different shrinkage ratios at an appropriate ratio, spinning with a spinneret, and forming a thermoplastic fiber having a self-winding elasticity function;
(3) means for simultaneously placing the ultrafine fiber false twist textured yarn obtained above and the thermoplastic fiber having a self-winding elasticity function in a compressed air jet device, and composite-bundle to form an elastic ultrafine fiber textured yarn;
(4) A means for winding the obtained microfiber textured yarn having elasticity into a yarn feed roller and a winding drum and winding the yarn.
[0012]
Referring to the processing flowchart of FIG. 1, after relaxing the microfiber cake (12), it is sent to the first yarn feed roller (2) via the yarn guide (1), and the heater (3), the cooling plate ( 4) Through a friction spindle unit (5) and a second yarn feed roller (7), processing such as heating, drawing, crimping deformation, and cooling is performed to form a false twist textured yarn. At this time, the other self-winding crimped elastic thermoplastic fiber (13) is sent from the yarn guide (6) to the second yarn feed roller (7), and together with the false twist textured yarn, the compressed air jet at the yarn outlet side After entering the device (8), the yarn is entangled and compounded by an air nozzle connected to a high-pressure gas source, and the processed elastic microfine fiber textured yarn (10) is led out from the third yarn feed roller (9). The yard is wound by controlling the feed rate between the three yarn feed roller (9) and the winding drum (11).
[0013]
The friction spindle unit (5) used in the above false twisting process is not limited to one type. For example, a friction spindle unit such as a friction disc (Disc), a friction belt (Belt), and a pin (Pin) which are well known in the industry. All unit types can be used. As the air nozzle of the compressed air jet device (8), any equipment known in the industry such as a confounding nozzle and a fiber mixing nozzle can be used. The knot of the textured yarn is preferably 85 knots / m or more in order to sufficiently exhibit the confounding composite effect and to have excellent unwinding properties.
[0014]
The elastic microfiber textured yarn (10) of the present invention can be further made into fabrics of various shapes by a knitting machine, a shuttle loom, or a shuttleless loom, and has no elastic effect before hot water treatment, so that the tensile force is controlled. With no problems, weaving performance and quality are superior to conventional elastic composite yarns. Finally, due to the high temperature during post-processing such as dyeing and hair styling, a spring-like spiral is formed at the interface between the two types of thermoplastic polymers having different shrinkage rates due to the difference in shrinkage stress, and a self-winding crimp elastic function is generated. This allows the fabric to have excellent elasticity and comfort.
[0015]
As can be seen from the above, the present invention is a manufacturing method in which a self-rolled crimped elastic ultrafine fiber textured yarn has been developed. In order to simply and specifically explain the features of the present invention, the following description will be made based on examples. However, the present invention is not limited to the following examples.
[0016]
Description of elasticity evaluation method Machine: INSTRON-6021 Universal tensile tester Method: (a) Cut into test pieces of 2.5 cm x 30 cm at room temperature under no tension (including 10 cm of clamping portion of clamp)
(B) The test speed is 1.667 mm / Sec. The return speed (Return Speed) is 10.0 mm / Sec. (C) The preload of the test piece (Pre-Load) is 12 g.
(D) Specified tensile force: 1000 g
Calculation method: Elastic elongation (Specified tensile force 1000 g or less)
= (A2-A1) ÷ A1 × 100%
Here, A1: the length of the test piece before tension A2: the length when a tensile force of 1000 g is applied to the test piece
(Example)
After unwinding the 360d / 48f polyester / modified polyester composite spun ultrafine fiber cake (12), it is sent to the first yarn feed roller (2) through the yarn guide (1), and heated to 160 ° C. (temperature) by the heater (3). Is heated to 100 to 220 ° C.), cooled by the cooling plate (4), false-twisted by the friction spindle unit (5), and stretched (stretched) by the second yarn feed roller (7) at a draw ratio of 2.28 times. The multiple is 1.3-4.0) to give a false twist textured yarn. At this time, the 75d / 24f polyester composite spun self-winding elastic fiber (B) is unwound from the yarn guide (6) and sent to the second yarn feed roller (7) at a speed of 500 m / min (the speed of the second yarn feed roller is 300-900 m / min), put it into the compressed air jet device (8) provided on the yarn outlet side together with the false twist textured yarn, and entangled and compounded the air nozzle pressure 5.0 kg / m ² yarn, and after processing Deriving the elastic microfiber textured yarn (10) from the third yarn feed roller (9), and finally controlling the feed rate between the third yarn feed roller (9) and the winding drum (11). Wind the yarn. Based on the processing flow chart shown in FIG. 1, a 225d / 72f elastic ultrafine fiber false twist textured yarn is produced.
When the textured yarn is used as the weft and the 75d / 36f false twisted textured yarn is woven as the warp, the weight is reduced by 25%, and post-processing such as finishing and dyeing is performed. In addition to obtaining a texture similar to that of peach skin, its elastic elongation (a specified tensile force of 1000 g or less) reaches 23.1%, making it extremely comfortable to wear.
[0018]
(Comparative example)
The ultrafine fiber cake (12), the conditions for false twisting, and the manufacturing method are all the same as in the above example, and the self-rolling crimped elastic thermoplastic fiber (13) is subjected to high shrinkage and low crimping at 75d / 36f boiling water shrinkage of 45%. 225d / 84f, a non-shrink ultrafine fiber false twist textured yarn can be produced.
When the textured yarn is a weft yarn and the warp yarn specifications, the weaving conditions and the processing are all the same as those in the examples, the elastic elongation ratio (specific tensile force of 1000 g or less) of the manufactured fabric is only 5.8%. Therefore, the comfort when wearing it becomes poor.
[0019]
As can be seen from the above Examples and Comparative Examples, the present invention employs a thermoplastic fiber having a self-winding crimping elasticity function, and performs an appropriate processing with a micro-fiber false twisted textured yarn to obtain the original characteristics of the ultra-fine fiber. In addition to drawing, it has a unique elasticity and improves the drawbacks of conventional ultrafine fiber false twist textured yarn.
[0020]
Industrial Applicability The elastic microfiber false twist textured yarn of the present invention has no self-winding elasticity function before dyeing and heat treatment in finishing, that is, the yarn has excellent dimensional stability. It is easy to weave, very useful for the spinning and garment industries, and has industrial production value.
[Brief description of the drawings]
FIG. 1 is a flowchart of a manufacturing process of the present invention.
FIG. 2 is a drawing of a thermoplastic fiber spinning process having a self-winding elasticity function according to the present invention.
[Explanation of symbols]
(1) yarn guide (2) first yarn feed roller (3) heater (4) cooling plate (5) friction spindle unit (6) yarn guide (7) second yarn feed roller (8) compressed air jet device (9) Third yarn feed roller (10) Elastic microfiber textured yarn (11) Winding drum (12) Microfiber cake (13) Self-rolling crimped elastic thermoplastic fiber

Claims (3)

(1) means for heating and false-twisting continuous fibers spun by a conventional spinning method or composite spinning method into a textured yarn to obtain an ultrafine fiber false-twist textured yarn;
(2) means for producing a thermoplastic fiber having a self-winding elasticity function by melt-combining two kinds of thermoplastic polymers having different shrinkage ratios at an appropriate ratio and spinning with a spinneret;
(3) means for simultaneously placing the ultrafine fiber false twist textured yarn and the thermoplastic fiber having a self-winding elasticity function in a compressed air jet device, and converging the composite into an elastic ultrafine fiber textured yarn;
(4) A method for producing an elastic ultrafine fiber textured yarn, comprising: means for feeding the obtained elastic ultrafine fiber textured yarn to a yarn feed roller and a winding drum for winding. The means for simultaneously putting the microfiber false twist textured yarn and the thermoplastic fiber having a self-winding crimping function into a compressed air jet device to composite and bundle it into an elastic ultrafine fiber textured yarn is a yarn exit to be put into a false twisting machine. The method for producing an elastic microfiber textured yarn according to claim 1, wherein the yarn is subjected to gas compression by the air nozzle provided on the side and connected to a high-pressure gas source to form an entangled composite. An elastic microfiber textured yarn obtained by the method for producing an elastic microfiber textured yarn according to claim 1.

Images