JPH05156534A - Production of falsely twisted polyester conjugate yarn - Google Patents

Abstract

PURPOSE:To produce falsely twisted textured conjugate yarn of double-layer structure comprising polyester multifilament yarns having color mixing effects and excellent economic effects. CONSTITUTION:When two polyester multifilament yarns having mutually different dyeability and difference in elongation are interlaced with air at a higher overfeeding ratio of lower elongation yarn than that of higher elongation yarn and subjected to false twisting processing by a circumscribing type friction false twisting tool through a disc method, a ratio (D/Y) of yarn speed and peripheral speed of disk is 1.50-1.75.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a two-layer structure false twisted yarn composed of polyester multifilament which is excellent in color mixing effect and is economical.

[0002]

2. Description of the Related Art Conventionally, two types of polyester multifilament yarns having different elongations are aligned and air-entangled, and subsequently false twisted by an external contact friction false twisting tool to obtain a low elongation yarn. A method for producing a two-layer structure yarn in which a high elongation yarn is wound around an alternate twist yarn around is disclosed in JP-B-60-11130.
It is disclosed in Japanese Patent Publication No. 60-7050. In Japanese Patent Publication No. 61-31216, a non-dyed yarn for an ionic dye is used as a core yarn, and a dyeable yarn for an ionic dye and a non-dyed yarn for an ionic dye are used as a sheath yarn in a combined manner to obtain a color mixing effect. It is disclosed to issue.
Further, in Japanese Patent Laid-Open No. 3-196633, when the above two yarns are supplied to the air entanglement treatment area, the boiling water shrinkage ratio of the low elongation yarn is 5% or less and the overfeed ratio of the low elongation yarn is high. By increasing the overfeed rate of the warp yarn, 2
A method of mixing a low elongation yarn in the outer layer portion of the layer structure yarn is disclosed. These are all proposed for the purpose of obtaining a yarn having a worsted texture.

[0003]

However, in the method disclosed in Japanese Examined Patent Publication No. 61-31216, the sheath yarn has 2
Not economical because it uses the dyed yarn of the book. In addition, Japanese public Sho6
According to the methods disclosed in JP-A No. 0-11130 and JP-A No. 3-196633, a sufficient color mix effect cannot be obtained even if a combination of heterochromatic yarns is used.

The present invention solves the above-mentioned conventional problems,
It is an object of the present invention to provide a method for producing a two-layer structure false twisted yarn composed of polyester multifilaments having a color mix effect.

[0005]

SUMMARY OF THE INVENTION According to the present invention, two polyester multifilament yarns having different elongation differences in dyeability from each other are used. After the air entanglement is made larger, the disk method is adopted as the circumscribing friction false twisting tool when the false twisting is performed by the circumscribing friction false twisting tool, and the yarn speed (Y
Disk peripheral speed (Dm / min) with respect to m / min)
The gist of the method is to set the ratio (D / Y) of 1.50 to 1.75.

The present invention will be described in more detail with reference to the drawings. FIG. 1 shows an example of an apparatus suitable for carrying out the present invention, which has low dyeability (hereinafter, referred to as different color). Elongation yarn and high elongation yarn are set to 1,1 ',
The feed rollers 2 and 3 are supplied with different overfeed ratios, and the air jet nozzle 4 for entanglement makes them entangled yarns. At this time, the overfeed ratio of the low elongation yarn is set higher than the overfeed ratio of the high elongation yarn. Under this condition, the probability that a part of the filaments forming the low elongation yarn will be present in the outer layer portion of the entangled yarn in the state of Talumi or loop becomes higher than that of the high elongation yarn, resulting in an entangled yarn structure, which will be described later. The talumi and loops remain after processing, which is a factor for enhancing the color mixing effect.

At this time, the difference between the overfeed rate of the low elongation yarn and the overfeed rate of the high elongation yarn may be 2 to 5%. Further, the purpose of forming the entangled yarn is to prevent the low elongation yarn and the high elongation yarn from being separated from each other and improve the high-order processability. The air injection nozzle 4 can employed Tasuran or interlacing nozzles, the performance of the nozzle, the fineness of the feed yarn will vary depending number of filaments or the like, sufficient entanglement if air pressure is generally 4 kgf / cm ² at ~6kgf / cm ² To achieve.

Here, the overfeed rate is {(peripheral speed of feed roller 2)-(peripheral speed of first delivery roller 5)} / (peripheral speed of first delivery roller 5) shown in FIG. 1 or {(feed The peripheral speed of the roller 3)-(the peripheral speed of the first delivery roller 5)} / (the peripheral speed of the first delivery roller 5).

After that, the first delivery roller 5 supplies the drawn false twisting zone, and the heater 6 and the false twisting tool 7 sequentially perform false twisting, heat setting and untwisting. When the spindle pin method is adopted as the false twisting tool, the yarn is squeezed by the pins, so that the entanglement tends to come off, and it is preferable to employ the circumscribing friction disk method as the proper false twisting tool.

At this time, as the false twisting conditions excluding D / Y (circumferential speed of the disk / yarn speed), the conditions of polyester filament yarn which are usually performed may be adopted. That is, the draw ratio is appropriately determined so that the false twist tension is approximately 0.12 g / d, the temperature of the first heater 6 is 180 to 200 ° C., and the temperature of the second heater 9 is for the purpose of preventing snare and the composite yarn. For the purpose of fixing the entangled structure, the temperature may be 160 ° C. to 190 ° C., and the overfeed rate may be 5 to 10%.

The setting of D / Y is particularly important for achieving the object of the present invention. Generally, when simultaneously false twisting yarns having different elongations, the low elongation yarns are difficult to elongate and the yarn structure exists in the core of the two-layer structure yarn, and the high elongation yarns easily elongate. The yarn structure exists in the outer layer portion of the yarn. At this time, if the elongation difference is generally 50%, the high elongation yarn becomes a two-layer structured yarn that is present in a state of being scattered around the outer periphery of the low elongation yarn, and has a texture that is not much different from that of an ordinary false twisted yarn. Elongation difference is 10
At 0%, a high-yield yarn is wound around the low-yield yarn to form a composite yarn structure. Since the latter structure has a structure in which the low elongation yarn is covered with the high elongation yarn, the color mix effect is low even if a metachromatic yarn is used. When the above-mentioned air injection nozzle 4 is entangled, a color mix effect is expected by giving a large difference in the overfeed rate. However, in reality, the high elongation yarn has a low thermal stress, so the low elongation with a large thermal stress. The warp yarn becomes the core of the composite yarn, and the effect is greatly reduced, and the expected effect cannot be obtained.

In order to solve this problem, it is important to set D / Y to an appropriate value. That is, when D / Y (circumferential speed of the disk / thread speed) = 1.50 to 1.75 is set, the high elongation yarn is not sufficiently elongated even if the elongation difference is 100% or more. The low-elongation yarn in the core portion does not have a clear winding structure in the form of alternating twisted yarns, and the proportion of talumi or loop formed by a part of the low-elongation yarn in the surface layer portion of the composite yarn increases.

When D / Y is set to be larger than 1.75, the high elongation yarn is sufficiently stretched and is wound around the low elongation yarn in an alternate twisted yarn form, and the ratio of the low elongation yarn existing in the outer layer portion is extremely high. Decrease to. On the other hand, if D / Y = 1.50 is set, the stretched yarn of the high elongation yarn is too small to have a two-layer structure, and thus a worsted-like textured yarn for the main processing cannot be obtained.

[0014]

EXAMPLES The present invention will be specifically described below with reference to examples.

(Example 1) Spinning speed 2800 m / min
Unstretched polyester filament yarn (120d / 35f) having a breaking elongation of 120% and elongation of 30% which is a cationic diable modified polyester stretched yarn obtained by
(70d / 36f) was subjected to entanglement treatment and drawn false twist in the step shown in FIG.

That is, the low elongation yarn is fed to the feed roller 2,
4. The high elongation yarn is supplied to the feed roller 3, and the low elongation yarn overfeed ratio with the first delivery roller 5 is 5.
0%, high elongation yarn was subjected to a Taslan treatment by a Taslan nozzle 4 at an overfeed rate of 1.0% and an air pressure of 4.0 kg / cm ² , and was subsequently supplied to a false twisting zone via a delivery roller 5 and a second delivery roller 8 Peripheral speed of 150m / m
in, draw ratio 1.02, first heater temperature 6 set to 160
C., D / Y = 1.704 was drawn and false twisted, and the second heater temperature was 150.degree. C. and thermal relaxation was performed at an overfeed of 5%.
The false twist / untwist tension at this time was 23/12 g.

The processed yarn thus obtained, which has been dyed with a cationic dye in a boiling water bath, is cut in the direction of the yarn cross section and observed under a microscope. As a result, a low elongation yarn and a high elongation yarn are formed in the outer layer portion. It was confirmed that the articles existed in a mixed state at almost the same ratio and the object of the present invention was achieved.

Comparative Example 1 D / Y of Example 1 was 1.70.
The sample was changed from 4 to 2.074, and the other samples and the processing conditions were the same as in Example 1. The twisting / untwisting tension in this case was 28/10 g.

The processed yarn thus obtained, which has been dyed with a cationic dye in a boiling water bath, is cut in the direction of the yarn cross section and observed under a microscope. As a result, a low elongation yarn and a high elongation yarn are formed in the outer layer portion. Although the articles existed in a mixed state, Example 1
The degree of existence of the low elongation yarn in the outer layer portion was obviously lower than that of No.

(Comparative Example 2) The D / Y of Example 1 was 1.70.
The number was changed from 4 to 1.454, and the other samples and the processing conditions were the same as in Example 1. The twisting / untwisting tension in this case was 20/15 g.

The textured yarn thus obtained is not a structure in which a high elongation yarn is wound around a low elongation yarn, but is a single-layer structure yarn in which two yarns are aligned and false twisted. Does not become textured yarn.

[0022]

As is apparent from the above description, according to the present invention, a two-layer structure false twisted yarn composed of a polyester multifilament having an excellent color mixing effect and an excellent economical efficiency can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of an apparatus suitable for implementing the present invention.

[Explanation of symbols]

 1,1 'original yarn 2,3 feed roller 4 nozzle (taslan nozzle) 5 first delivery roller 6 first heater 7 false twisting tool 8 second delivery roller 9 second heater 10 third delivery roller 11 take-up roller 12 take-up roller

Claims (1)

[Claims] 1. A circumscribed type of two polyester multifilament yarns having different elongation differences in dyeability from each other after air entanglement with the overfeed ratio of the low elongation yarn being larger than that of the high elongation yarn. When performing false twisting with the friction false twisting tool, a disk method is adopted as the circumscribed friction false twisting tool, and the ratio (D / Y) of the yarn speed to the peripheral speed of the disk is set to 1.50 to 1.75. A method for producing a composite false twisted yarn, which is characterized by: