JPS61160441A - Production of composite fiber and false twisted two-layered structural yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to feed yarns for the production of composite textured yarns, particularly feed yarns comprising polyamide filaments, and a process for simultaneous stretching and false twisting of said feed yarns.

(Prior Art) False-twisting thermoplastic long fiber yarns to form bulky yarns has been practiced for a long time. This method is very convenient because a large bulky yarn can be obtained with relatively simple processing, but on the other hand, the texture of the processed yarn is monotonous and tends to be artificial. Therefore, a method of simultaneously false twisting multiple yarns has been proposed as a method to more closely resemble the texture of natural spun. For example, as shown in Fig. 3, the raw yarn (11) is false-twisted using a false twisting device (5), and the raw yarn (2) is fed thereto so as to be wrapped around it while overweeding, and then the raw yarn (11) is fed to the heater (6). This method creates a core-sheath two-layer composite yarn (8) by setting and dissolving it.However, this method
It has the disadvantage that the meeting point between the KM yarn (2) and the yarn that is wound around it tends to become unstable (on the contrary, knotted yarn can also be made using this), and it requires advanced technology to obtain a well-balanced yarn without knots. Further, since threads having different feeding speeds are threaded at the same time, it requires skill to operate.

In order to improve this, as shown in Fig. 4, the supply yarn (1) and the supply yarn (21) are simultaneously supplied, and instead of the supply yarn (1)
By significantly lowering the degree of molecular orientation (that is, significantly increasing the cutting elongation) of the supplied raw yarn (210), the raw yarn (25), which is easily stretched around the raw yarn (1) when false-twisted, is coiled. te2
A layered structure method was proposed. This made it possible to create a two-layer structure with simultaneous yarn feeding, improving processing stability and operability. There is a tendency for the dyeing fastness to deteriorate, or the difference in dyeing between Fi yarn (1) and yarn (21) to become large, resulting in poor appearance.Especially for polyamide fibers. In that case,
Raw yarn (25050) If the molecular orientation is significantly lowered (the cutting elongation is significantly increased), an excellent cotton-like texture can be obtained, but the dyeing fastness is markedly reduced and it becomes unusable.This dyeing fastness It is sufficient to increase the molecular orientation of the raw yarn (210), but in the case of polyamide, unlike polyester, etc., there is a region where it self-extends due to the influence of moisture during spinning and winding.This region depends on the polymer composition, denier, etc. Although it varies depending on the composition and spinning conditions, in the case of nylon-6, the elongation at break of the spun yarn is 300 to 70% at a spinning speed of approximately 1300 to 3500 m7 minutes, and winding cannot be carried out industrially in this range. On the other hand, spinning speed 35
In the so-called high-speed spinning region of 00 m1 min or more (where the elongation at break is 70% or less), it becomes possible to wind it again. However, raw yarn with a cutting elongation of about 70% (
Composite plate-twisted processed yarns of 25 and (1), which has even lower cutting elongation than 25, have contradictory problems such as satisfactory dyeing fastness but poor hand feel. A multifilament yarn having a filament elongation at break of 70 to 2oO percent is desired.

(Objective of the invention) The present invention has a cutting elongation of 70 to 70, which was conventionally considered impossible.
The object of the present invention is to provide a 200% polyamide multifilament yarn for practical use in a state suitable for composite processing.

A further object of the present invention is to provide a core-sheath two-layer composite yarn that is highly dye fast and exhibits a cotton-like texture.

(Structure of the Invention) According to the present invention, (1) a polyamide multifilament in which one component has a break elongation of 70 to 200 percent and a low elongation component multifilament whose break elongation is 30 percent or more lower than the polyamide multifilament; (2) a polyamide multifilament in which one component has an elongation at break of 70 to 200%; A false-twisted two-layer structure textured yarn characterized in that a composite fiber formed by intertwining 2/M or more of a low-elongation multifilament with a low elongation component of 30% or more is subjected to simultaneous stretching and false-twisting. A manufacturing method is provided.

The present invention will be explained in further detail.

At least one component of the composite fiber of the present invention has a cutting elongation of 70
~200% polyamide multifilament. This polyamide multifilament yarn becomes a sheath component of a two-layer processed yarn during false twisting, etc., and by using polyamide as the high elongation component, a natural cotton-like woven or knitted fabric can be obtained. Even if other polymers such as polyester are used, a cotton-like material cannot be obtained.

Further, the elongation at break of this polyamide multifilament is preferably 80 to 150%. If the elongation is less than 70%, not only will a two-layer textured yarn be obtained, but a cotton-like woven or knitted fabric will not be obtained, and at the same time, a deep hue will not be obtained.

On the other hand, if it exceeds 200%, a two-layer textured yarn can be easily obtained, but the color fastness is poor and it is no longer practical.

Next, the other component of the composite fiber of the present invention must have a breaking elongation lower than that of the polyamide multifilament by at least 30%, more preferably by at least 50%.

If this difference is less than 30%, a processed yarn with a sufficient two-layer structure cannot be obtained, and therefore a cotton-like texture of the woven or knitted fabric cannot be obtained. In addition, this low elongation component is polyester or polyolefin.

Any thermoplastic synthetic fiber such as polyamide can be used, but a woven or knitted fabric with a heather effect can be obtained by using a polymer that is different from the high elongation component in terms of dyeability. Moreover, if the same polyamide polymer is used, a product with excellent level dyeing properties and easy drawing can be obtained. In this case, the cutting elongation of the low elongation component must be adjusted to 70% or less to prevent elongation due to moisture. Further, the composite fiber of the present invention is composed of a polyamide multifilament and a multifilament having a lower breaking elongation than the polyamide multifilament, which are composited by intertwining parts of 21 F/M or more, preferably 10 or more, and more preferably 20 or more. Ru.

If the number of entanglements between the two components is less than 2/M, the combination of the two components is insufficient, and when the material is taken up for spinning or used for processing, the two components separate, making it impossible to wind up or supplying the material incorrectly. Trouble is more likely to occur.

From this point of view, the degree of entanglement is preferably 10 pieces/M.
It is better to do more than that. In addition, if the number of entangled parts is 20/M or more, separation of the two components in the processed yarn can be prevented, and a two-layer structured yarn with improved handling properties can be produced without using a new interlacing device during processing and supply. .

Next, the method for manufacturing the composite fiber of the present invention will be described.

In the case of the polyamide component used in the present invention, such as polycapramide, a yarn having a breaking elongation of 70 to 300 percent self-extends by absorbing moisture after spinning, and therefore cannot be industrially wound. In particular, when trying to draw an undrawn yarn with a breaking elongation of 300% or more to 70-300%, it is necessary to hot-draw it at a very low speed, which is almost impossible industrially. Therefore, the present inventors investigated the problem of how to wind polyamide multifilament having a breaking elongation of 70 to 200 percent, and found that by winding the polyamide multifilament with a component that does not self-extend due to moisture and winding it, I found that the problem was solved.

For example, as shown in FIG. 1, a molten polymer is extruded from a die (10) having a plurality of discharge ports, and a thread (11') having a low elongation component is passed between two pairs of rollers (13') having different circumferential speeds.
) (13), the high elongation component is stretched to a spinning speed range where the cutting elongation is 70 to 200% using a roller (14') (14
), after which it is interlaced and combined by an interlacing device (15), and then wound up.

Another method is to use the low elongation component (11
') is spun using a normal spinning method to discharge the high elongation component. Immediately after the polymer is cooled and solidified, it is focused by a focusing guide (17) to reduce air resistance, then spun at high speed, entangled, and wound. You can also adopt the method of Furthermore, after spinning, a number of methods can be employed, such as heat treating one component to lower its elongation, entangling and compounding, and winding. It is also possible to adopt a method of adjusting the cutting elongation of the two components by changing the size of the die.

Note that the nozzle 1 melt-extrudes the same nylon polymer, and the inside of the nozzle is formed with two or more independent extrusion zones, one of which extrudes polyamide and the other zone extrudes polyamide or other polymer. Any means well known in the art may be used, such as causing

In order to obtain a core-sheath double-layered false-twisted yarn using the composite fiber provided by the present invention, a normal false-twisting machine capable of drawing and false-twisting processing may be used.

What is important here is to maintain the draw ratio during processing G at least 1.05K (the upper limit is about 1.30). A two-layer structured yarn is obtained in which the elongation yarn is wound around the core portion as a sheath component. In this case, the number of entanglements at the composite yarn stage is 20/
If MK is used, even after processing, a so-called interfacial entangled structure occurs in which both filaments are entangled with each other at the core-sheath interface of the two-layer yarn, resulting in a two-layer yarn with a stable structure and extremely easy handling. A structural yarn is obtained.

(Operations and Effects of the Invention) According to the present invention, there is provided a polyamide-based conjugate fiber that has color fastness and is useful for obtaining a false-twisted two-layer structured yarn having a cotton-like texture.

Here, in order to obtain a false-twisted two-layer yarn having a polyamide yarn as a sheath component by drawing and false-twisting, a difference in elongation is required in the starting yarn. However, in the case of polyamide, the high elongation component is in the self-stretching region and cannot be rolled up in reality, so in this sense it has poor color fastness.

It was impossible to find a false-twisted two-layer structured yarn that would satisfy both the cotton-like texture and texture.

In this regard, according to the present invention, polyamide filaments that satisfy cotton-like texture and color fastness are used as a high elongation component, and are wound without self-stretching, although they cannot be rolled up due to self-stretching. Since the fiber is wound by interlacing and compounding it with a low elongation component that can be removed, the desired raw yarn for processing (composite fiber) can be realized.

Furthermore, since the composite fiber of the present invention is composed of a polyamide multifilament as a sheath component and a multifilament yarn as a core component of the two-layer processed yarn, it is necessary to supply the two components individually during processing. Creel space and supply system storage space are reduced, and troubles such as misplacement of the supply system can be prevented.

(Example) Example-1 Intrinsic viscosity [η) i, o s Polycapramide containing 0.3 weight percent titanium oxide was melted at 253°C using the apparatus shown in Figure 1A, and then melted at 0.3φ. It was extruded simultaneously from two nozzles each having 20 holes. After the extruded polymer is cooled, one multifilament is stretched between the oil-applied roller (4) (4') and the roller (5) (5'), and the other multifilament yarn is stretched between the oil-applied roller (5) ( 5') and rollers (5) (5').
After the two components were combined on a cloth, they were entangled in an interlacing device (6), and then rolled up into cheese. At this time, roller (4) (4
'), the speed of roller (5) (5) was variously changed, and the air pressure supplied to the entangling device was variously changed to
Composite fibers having the breaking elongation characteristics shown in the table were obtained. In addition, the results of individual winding are also shown.

The discharge amount was adjusted so that each of the two components had a denier of 40 denier after winding.

In the present invention, the cutting elongation and the degree of entanglement are measured by the following method.

Cutting elongation: Measured at measurement length 5 (XI tensile speed 20 I2/min, chart speed 20 cm/min, initial load 0.111/de using Instron's Instro/■ type tensile tester. The strength component is shown in Figure 2, where L is the cutting elongation, and the high elongation component is shown as the average of 5 times, where H is the cutting elongation.

Degree of entanglement: A load of 11/de is applied to the sample, 9/d
A hook (e) was inserted between the single yarns and a mark was made on the hooked part, and the number of marks per meter was averaged over 5 times.

Table 1 (Note) Comparative Example 1 (45) Both yarns were in the self-stretching range and could not be wound.

Comparative Example 2 (46): The elongation of the high elongation component exceeds 200%, resulting in poor dye fastness.

Comparative Example 3 (410): The difference in elongation between both yarns is less than 30%, making it difficult to create a two-layer structure yarn.

Comparative example 4 (fu 11)...Same as above Comparative example 5 (mu 12)...In order to wind without entanglement,
The roll is in poor condition and cannot be unwound.

Furthermore, the composite yarn obtained in the first garment was FTP-4 manufactured by ARCT.
Machining speed 400 m/min using 83-6F machine.

Heater temperature 155℃, 3-axis ceramic disk,
Stretching and false twisting was performed at D/Y 2.0. The stretching ratio was adjusted to 1.05 to 1.30 and the processing tension was adjusted to 18 to 20I.

The two-layer structure composite state of the obtained processed yarn and the weavability of the fabric,
Table 2 shows the evaluation results for texture and color fastness.

The evaluation was given by 5 experts as excellent (◎) and & (○).

The evaluation is made on a four-level scale of slightly poor (Δ) and poor (x) and averaged.

Table 2 (Note) Experiment/% In the case of 9111113, the yarn was further entangled once before being false-twisted, resulting in a total of 30 to 35 entangled yarns/M.

As is clear from Table 1, even polyamides in the range of breaking elongation of 70 to 200%, which conventionally cannot be wound by themselves, can be wound by combining with components that do not self-extend.

Furthermore, as is clear from Table 2, by simultaneously stretching and false twisting the conjugate fiber of the present invention, it is possible to produce a woven or knitted fabric with an excellent texture and excellent color fastness. As is clear from this example, the texture and color fastness of a woven or knitted fabric depend on the cutting elongation of the polyamide multifilament, which is the sheath component of the composite processed yarn of the composite fiber supplied for processing, and the low elongation component, which is the core component. The difference from the cutting elongation is dominant, and the cutting elongation of the sheath component is 7
It is necessary to adjust the cutting elongation to 0 to 200% and to make the difference in cutting elongation wm* from the low elongation component to 30% or more, more preferably 50% or more.

In addition, the composite fibers of the present invention are 2 pieces/M or more, more preferably 1 piece/M or more.
By having 0 pieces/M or more of entangled parts, it is possible to prevent unraveling troubles during processing. Furthermore, 20 pieces/
If the fabric has entangled portions of M or more, it is possible to obtain excellent workability, back weavability, and texture of the woven or knitted fabric without performing additional entangling treatment before processing.

[Brief explanation of drawings]

Figure 1 is a process route diagram for explaining an example of manufacturing the composite fiber of the present invention, Figure 2 is a cutting elongation measurement chart of the composite fiber of the present invention, and Figures 3 and 4 are conventional composite fibers. It is a route map of a false twisting process. In Figure 1, 10: spinneret, 11: low elongation component 11
1': Boryamide high elongation component, 12: Island device with oil agent +
13+13'114114': C1-ra. 15: interlacing device, 16: wire/dar in Figures 3 and 4, 1: core yarn component raw yarn. 2+2': Sheath component yarn, 3.4: Supply roller, 5: False twisting device, 6: Heater, 7: Take-off roller. 8: Composite processed yarn, 9: Y/D-O/Closed (Ino (22 years old 2) lead iris → O, 4-Ki

Claims (7)

[Claims] (1) A polyamide multifilament whose one component has a breaking elongation of 70 to 200% and a low elongation component multifilament whose breaking elongation is 30% or more lower than the polyamide multifilament are intertwined at 2/M or more. A composite fiber characterized by being composite. (2) The composite fiber according to claim (1), wherein the low elongation component is polyamide. (3) The composite fiber according to claim (1), which has a difference in elongation of 50% or more. (4) The composite fiber according to claim (1), which has a degree of entanglement of 10 pieces/M or more. (5) A polyamide multifilament whose one component has a breaking elongation of 70 to 200% and a low elongation component multifilament whose breaking elongation is 30% or more lower than the polyamide multifilament are intertwined at 2/M or more. A method for producing a double-layered false-twisted textured yarn, which comprises subjecting composite fibers to simultaneous stretching and false-twisting. (6) The method for producing a false twisted two-layer textured yarn according to claim (5), wherein the stretching ratio is 1.05 to 1.30. (7) A method for producing a false-twisted two-layer structured yarn according to claim (5), wherein the conjugate fibers are further entangled before being simultaneously stretched and false-twisted.