JPS62170541A - Production of spun like composite processed 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 Industrial Application) The present invention provides an improved method for producing composite textured yarn, and more specifically, a method for producing an improved composite textured yarn, and more specifically, a method for manufacturing a yarn with a two-layer structure like a nupan-like yarn in which 16 sheath yarns are attached around the circumference of a core yarn. Regarding the manufacturing method.

(Conventional technology) Polyester Mi 1! Textile fibers have a solid position in the clothing field due to their excellent physical properties, and in recent years, the ωf research and development of spun-like composite processed yarns has been significantly promoted due to consumers' preference for natural fibers. As a method for manufacturing a core/sheath type two-layer composite textured yarn, there have been many proposals including a method of plucking and false twisting two yarns having different orientations. For example, in Japanese Patent Publication No. 59-24212, the water discharge contraction rate is 4 to 1.
A method is disclosed in which a drawn yarn of 0 cm and an undrawn yarn with a water discharge shrinkage rate of 50 to 78 cm are combined and false twisted to produce a composite yarn in which the drawn yarn is used as a core and the undrawn yarn is used as a sheath. Also, special public service 1986-22
No. 092 discloses a method in which cationic town-dyed polyester and normal polyester undrawn yarn are air-entangled and then false-twisted. On the other hand, Japanese Patent Publication No. 60-20489 discloses a method that allows stretching to a stretching ratio of 1.1 times or more. A method is disclosed in which a yarn A having a diameter of 80 cm or more and a yarn B having a diameter of 80 cm or more are combined and false-twisted.

(Problems to be Solved by the Invention) However, the above-mentioned conventional methods are based on low-speed false twisting.
The processing in JP 0-22092 is spindle false twisting.
Due to the limit of spindle rotation, the processing speed is at most 100~
The upper limit is 150 m/min.

Further, Japanese Patent Publication No. 60-20489 uses traction false twisting, but the processing speed is about 850 tn/min.

On the other hand, in recent years, technological innovation in the field of false twisting has been noticeably missed, with the appearance of false twisting machines with processing speeds exceeding 1,000 m/min, and POY-DTY in terms of use.
For false twisting H50~150d class, at least 70
It is common practice to perform false twisting at 0 m/min.

However, in general, when DTY processing is performed at high speed using a 7-strand twisting type twisting device, the tension in the heating section is released and the twist propagation is unrestricted. It is known that a so-called surging bowl phenomenon occurs, which vibrates within the vessel. It is generally believed that this phenomenon occurs more easily the faster the processing speed and the lower the tension in the heating section.
This leads to the occurrence of untwisted yarn and an increase in yarn breakage during processing. For this reason8
．． POY- with spinning speed of 500 m/min class
The upper limit speed for DTY processing is 900 to 1,000 m/min, and 700 m/min for stable operation.
It is common to process the front and back.

Furthermore, in the case of swept false twisting of two multifilament filaments with different orientations, the sheath yarn has a long difference in length between the core yarn and the warp yarn, and is wound around the core yarn in an alternating manner, which increases the strength of the sheath yarn. The surging rate is almost 400 ~ because it is held almost only by the core yarn and the thermal tension during DTY processing of POY alone is not exceeded.
The speed becomes as low as 500m/min.

On the other hand, in order to prevent the surging phenomenon, it is possible to rotate the twisting device at a low speed to reduce the tension in the heating section and run the false twisting heater at a low twist density. Because of the slippage between threads, it is difficult to stably twist the yarn in the longitudinal direction, which is not a good idea.

The present invention provides a method for producing spunlike composite textured yarn, which can perform high-speed false twisting fIU without inducing the above-mentioned additional surging phenomenon, and can produce composite textured yarn with high efficiency.

(Means for Solving the Problems) The present invention uses both drawn multifilament yarn A and undrawn multifilament yarn B, which have a ratio of elongation at break of 1.5 to 4, as raw yarns to be supplied. After the raw yarn is aligned and subjected to air entanglement treatment, it is passed through a false twisting heater, a twisting device, a cooling plate, and a friction type false twisting device in order to be wound. Tin) and yarn tension (Tout) after passing through the device.
It is characterized in that I'i n≧8.

The multifilament yarn used in the present invention has a spinning speed of 8
000 to 4000 m/min or so, drawn and undrawn yarns such as polyester, with an elongation at break (EA) of 80 to 85% as a drawn multifilament yarn.
The elongation at break (Ea) of the undrawn multifilament yarn B is preferably 40 to 60%, and the elongation at break (Ea) is 90 to 160%.
, preferably 100 to 140 inches; if the elongation at break is outside the above range, the H operability will deteriorate. Furthermore,
The combination of both yarns is within the above range, 1.5≦E
The one having the relationship β/EA≦4 is used. In general, the core
When manufacturing yarn with a two-layered sheath structure, the greater the orientation difference, the greater the ink dyeing effect, and the greater the difference in yarn length between the core and sheath, increasing the spun texture. In this respect, if EB/EA is less than 1.5, the result is simply two yarns that are combined and aligned. On the other hand, when EB/EA is increased, the drawing ratio at the time of false twisting is determined by the highly oriented yarn A, which has a small residual elongation, so the low oriented yarn BFi is not drawn sufficiently and fuses in the high temperature heater. This results in fusing and thread breakage.

In the present invention, after aligning the drawn filament yarn B and the undrawn filament yarn B, air entangling treatment is performed to produce a false twisting heater, a twisting device, and a cooling pre-twisting device.

- 7 retraction type false twisting devices in sequence and winding at high speed.

Conventional air entanglement processing equipment, false-twisting heaters, and cooling plates can be used, and the treatment is carried out under normal false-twisting conditions, for example, the temperature of the false-twisting heater is 180 to 220°C. Furthermore, the Flix-four-type false twisting device may be any external type friction twisting device that has the function of falsely twisting the yarn and sending it out at the same time.For example, Crossbelt manufactured by Murata Machinery, Ringtex manufactured by Barmag, etc. are used. .

The twist stopping device is a device in which a plurality of yarn guides are arranged in a discrete manner with respect to the yarn traveling axis to apply friction to the traveling yarn and to restrict the twist from going upstream by the false twisting device. 1674258
It is preferable to improve the twisting guide described in the publication by equally dividing it and use it so that the guide interval of the twisting guide can be adjusted and the frictional force applied to the yarn can be changed. Due to the twisting device, the yarn tension (Tin) before the device is lower than the yarn tension (Tout) after passing through the device, but the tension ratio (Tout/Tin) tit a
, o or more, preferably 4.0 or more.

Next, a specific example of the present invention will be explained according to the drawings.

First, the manufacturing process will be explained with reference to FIG. Figure 1 shows the overall structure of the present invention, in which the highly oriented multifilaments of the core yarn (A) and the sheath yarn (B)
The low-oriented multifilaments are the 10th rule (1) and the second
After being subjected to shear entangling treatment by the interlace nozzle (3) between the yarn and the wire (2), it enters the false twisting area.

The false-twisting area is equipped with a false-twisting heater (4), a twisting device (5 inches, a cooling plate (6), and a 7-inch twisting device (7)).
is located. Is there a heating area between the 20th rule (2) and the 7-way 3-way twisting device (7)?
The twist caused by l! is somewhat transmitted by the twisting device (5). li
As described above, the false twisting heater (4) heat-sets the twisted material in a state in which the twist is not sufficiently transmitted. The false-twisted multifilament passes through the take-up machine No. 80-80-8 and winds up the twisted multifilament (80).
9). In addition, Fig. 1 shows the case where the false twisting heater (4) and the twisting device (7) are on tn'i, whereas Fig. 2 shows the case where the false twisting heater (4) and the twisting device (7) are on the bend. This is an example of a case where the

Next, the structure of the composite textured yarn obtained by the above process of the present invention is shown in FIG. The core yarn (A) is located in the center, and the filaments are arranged almost parallel to each other. Core thread (
The crimp of the N filament is weak and almost linear. The sheath thread (B) is loosely wound around the core thread (N) and a part of the thread forms a fluff.There are intertwined parts and non-entangled parts where the core and sheath threads are intricately intertwined in the longitudinal direction of the thread. However, even in the intertwined part, not all the sheath threads are intertwined, and some filaments become loose filaments and pass through the intertwined part.In the unentangled part, the sheath threads have weak constriction. Some filaments are straight K, while others are loosely swirled around the core yarn.

(Function) The method of the present invention performs false twisting at high speed and with high efficiency by suppressing the surging phenomenon described above.In order to suppress the surging phenomenon, the twisting device is combined with the false twisting heater and the twisting device. Provided between.

That is, according to the findings of the present inventors, the surging phenomenon occurs when the four conditions of high temperature, high speed, high twist density, and low tension are met69, so if some of these conditions are missing, is unlikely to occur. After various studies, the inventors of the present invention found that the tightness of the twist inside the false twisting heater! It has been found that surging does not occur if the twist density of the twisting device is reduced to about 1/10 of the twist density of the twisting device.

In the present invention, the twist that goes upstream from the /ri twisting device is fixed by the twisting device! The twist density in the false twisting heater, which is in a high temperature state, is kept low, while the high twist density area downstream of the twisting device is kept at a low temperature by a cooling plate.

Therefore, the false-twisted yarn according to the present invention is set by a high-temperature false-twisting heater when the twist density is low, or by the residual heat held in the heater during the high-twist density after passing through the combustion device, and is different from the normal DTY yarn. The yarn has a weak and coarse constriction that is completely different from the constriction obtained by twisting.The core yarn is polyester multifilament FDY (EA=41 inch) 75d/48f.The semi-dull round cross section yarn is polyester multifilament ( ffb=12%) 75d/86f Prite triangular cross-section yarn was used to produce a two-layer yarn using the false twisting device shown in Figure 2 under the following conditions, and the relationship between the resistance of the twisting device and the rate of surging generation was investigated. . The results are shown in Table 1. O False twisting conditions Straight stretch ratio 1.01, heater temperature 220°C1
False twisting device Positorque 1 manufactured by Scratsug Co., Ltd. Dinuk surface speed/yarn speed (D/Y) 1.80, interlace pressure 2.0ki/m2 Yarn tension before and after the twisting device Tout / Tin <
8.0, surging occurred when No≧500 m/min, but when Tout/Tin = 8.0, surging did not occur when No = 500 m/min. Also, for Tout/Tin24, 0, No=7
Even at 00 m/min, no surging occurred and the operability was good. The number of twists on the cooling plate at Tout/Tln=4 and 0 was approximately 2100 t/m. The conditions obtained were 16 rice plants with weak core and sheath.
The conjugation of the opening and opening was good, and the sheath threads were loosely wound around the core threads and had some fluff.

No. 1 Facing Example 2 Polyester filament FDY (Ea=52
H) Using 160d/72f bright triangular cross-section yarn and semi-dull round cross-section yarn with various breaking elongation El as sheath yarn B, two-layer S yarn was produced under the following conditions using the false twisting device shown in Figure 1. The results are shown in Table 2.

False twisting conditions: Stretching ratio: 1.05, heater temperature: 210'C.

Processing speed 600m/min Dinuku surface speed/yarn speed (D/Y) 1.70, twisting device Ishikawa Seisakusho @SC
Disc (disc urethane) twisting device Tout/T
in4.5, interline pressure 2.5kg/cm2 If the difference in breaking elongation between the core yarn and sheath yarn becomes smaller, the ink dyeing effect of the core yarn and sheath yarn will decrease.Furthermore, the constriction state of the core yarn and sheath yarn will be similar. The yarn length difference is also small and the spun feel is small (EB/EA<1.
50). On the other hand, if the difference in elongation at break becomes large, there will be true east young fruits, but the sheath threads will tend to be fused, and the texture effect will decrease (EB
/EAN4.0).

Span 11. 1.5-E B/ has a large 'il texture.
It is in the range of E^≦4.0.

On the other hand, regarding operability, EB < 90 and Ea > 1
In the range of 50, thread hanging performance during 1ri false twisting became poor or the thread breakage rate increased, resulting in decreased operability during high speed false twisting.

Next, when a fabric was woven using EnlE^=2.880 yarn for the weft and warp K 75d/a6f processed yarn, the raw silk-like sliminess was somewhat dull and the drapability was improved (invention (Effects) The manufacturing method of the present invention is highly effective. By setting the front and rear yarn tension ratio to an appropriate value, high-speed false twisting becomes possible. In addition, the cohesion between the core and sheath and the strength of the yarn are good, and no troubles occur during the subsequent # knitting or weaving processes, similar to those during conventional low-speed processing. The resulting fabric has a spun texture with a slimy feel similar to raw silk.

Note that the polyester yarn used in the present invention is not limited in fineness, number of filaments, or cross-sectional shape.

[Brief explanation of drawings]

? Figure g1 is an explanatory diagram showing an apparatus for manufacturing a two-layer structured yarn by implementing the method of the present invention, Figure 7JfJ2 is an explanatory diagram of a case where the arrangement between the heater and the twisting device is changed, and Figure 8 is an explanatory diagram showing a device for manufacturing a two-layer structured yarn by the method of the present invention. FIG. 2 is an explanatory diagram illustrating the obtained two-layer h'4 yarn. (1)...10th rule, (2)...20th rule, (
3)...Interlace nozzle, (4)...False twisting heater, (5)...Twisting device,
(7)... Twisting device, (8)... No. 80-Rule, (A
J... Highly oriented yarn, (9)... Winding bobbin, (B)
...Low oriented yarn. Procedural amendment (Muryo) April 2, 1986

Claims (4)

[Claims] (1) Both the drawn multifilament yarn A and the undrawn multifilament yarn B, which have a ratio of elongation at break of 1.5 to 4, are used as the supplied yarns, and the supplied yarns are aligned and subjected to air entanglement treatment. After the twisting, the yarn is passed through a false twisting heater, a twisting device, a cooling plate, and a friction type false twisting device in order to be wound up. Tension (Tout) Tout/Tin≧8
A method for producing a spun-like composite textured yarn. (2) The elongation at break of the drawn multifilament yarn A is 80~
85%. (3) Breaking elongation of undrawn multifilament B is 90~
15. A method according to claim 1, wherein the oxidation rate is 150%. (4) The method according to claim 1, wherein the winding speed is 500 m/min or more.