JPS60231814A - Preparation of multifilament for dividing - Google Patents

Abstract

PURPOSE:To obtain the titled yarn without causing end breakage and curled yarn, by subjecting a synthetic polymer in a molten state to melt spinning, cooling it, providing it with a finishing oil, taking it off by high-speed take-off rolls, winding it without drawing it and carrying out >= once roller turn in the same direction continuously. CONSTITUTION:A synthetic polymer (e.g., polyethylene terephthalate, etc.) is subjected to melt spinning in a molten state from the spinneret 1, the spun yarn Y is sprayed with a cooling gas from the cooling gas blow part 2, cooled, heat- treated by the heating chamber 3, provided with a finishing oil by the oiling roller 4 and divided by the dividing guides 5 and 6 into yarn. The yarn is then taken off by a pair of the Godet rollers 7a and 7b without carrying out >=360 deg. roller turn in the same direction continuously, the yarn is bundled by the bundling guide 8, and wound by the winder 9 at >=4,000m/minute winding speed, to give the desired yarn.

Description

Detailed Description of the Invention a. Industrial Field of Application The present invention is directed to a multifilament for dividing synthetic fibers such as polyester and polyamide for the purpose of dividing them later into monofilaments or two or more multifilament groups. The present invention relates to a manufacturing method.

b. Prior Art One method for economically producing fine grades, ie, fine multifilaments or monofilaments, from synthetic fibers such as Bolysul II fibers or polyamide fibers is to split the multifilaments into even finer multifilaments or monofilaments. The so-called "fiber separation method" has been known for a long time.

An example of this fiber separation method is as follows.

First, a package wound with untwisted stretched multifilament is placed on a rotatable reel, from which the multifilament is pulled out laterally, untwisted, passed through a guide to suppress tension fluctuations, and then re-rolled. After winding it around the package or using a compensator or the like, it is separated into two or more multifilament groups or monofilaments via a separation guide and wound onto a bobbin.

In this method, the point where the multifilament is split into two or more multifilament groups or monofilaments is usually called the splitting point, but it is necessary to prevent this splitting point from being displaced near the exit of the splitting guide. This is an important point for smooth implementation of this method.

However, in reality, displacement of the dividing point is unavoidable in this method, and in particular, as the dividing speed is increased, the displacement of the dividing point becomes even larger, causing a problem between the exit of the dividing guide and the dividing point. The distance becomes significantly large, and a twist occurs between them (this state is referred to as "twisting").

and two or more separated multifilament groups, or
This is the cause of curled yarns due to monofilament yarn breakage or inter-yarn friction.

In these conventional methods, the package yarn, which is the raw yarn for fiber splitting, is untwisted, and when untwisting it, a rotating creel is used to prevent the untwisted yarn from entering the multifilament. However, in reality it remains rm.''
There is an occurrence of

In recent years, research has been conducted on the occurrence of this "twisting", and as stated in Japanese Patent Application Laid-Open No. 54-59421, this "twisting" is observed in the process of manufacturing packages of multifilamet, which is the raw yarn for fiber splitting. It is known that there is a cause for the occurrence of "retention".

That is, when the multifilament is rolled up as a package, the filament is rolled at the folded part of the traverse, which causes a slight false twist. In addition, when the multifilament is stretched, the roller turns on the stretching roller causes a phenomenon called "yarn wobbling" in which the multifilament moves in the axial direction of the roller on the stretching roller. This means that false twisting occurs and the filaments that make up the filaments become entangled.

Therefore, in order to solve these problems, stretching is applied to undrawn or semi-drawn multifilament yarn, and then, following the stretching, the multifilament is continuously divided into two or more multifilament groups or monofilaments and wound up. This method has been devised, but since the roller turns are actually performed by the drawing roller during drawing, false twisting occurs in the drawn multifilament due to the above-mentioned reason, and the twisting is eliminated in the subsequent fiber splitting process. The current situation is that stable process conditions cannot be obtained.

Problems that the C0 Invention attempts to solve The present inventors have conducted various studies with the aim of establishing a method that can separate fibers in a manner that eliminates the "twisting" during fiber separation that has been explained so far. Among the causes of the occurrence of "one-twist" described in the conventional method, a major problem was the elimination of the false twist phenomenon that occurs in the drawing roller when drawing the multifilament for fiber splitting.

This problem is that when a roller turn is performed on a stretching roller, one pair of rollers is twisted or tilted slightly to obtain the turn pitch.
This causes the yarn to roll between the rollers, and the rolling phenomenon is further exacerbated by self-shrinkage of the yarn due to heat treatment, which increases yarn wobbling on the rollers and causes migration (false twist) between single yarns. , is caused.

In other words, the biggest problem with migration (false twist) between single yarns is that one or more rollers are used to continuously turn 360 degrees or more in the same direction for drawing and other purposes. That is why.

d8 Means for Solving Problems The present inventors investigated a method for obtaining a multifilament for splitting that can be separated by a method that eliminates "twisting" and found that the main cause of "twisting" is We have come to the conclusion that the above objective can be achieved by adopting the following means for a multifilament for fiber splitting that eliminates roller turns during certain drawings. That is, the present invention provides 1) in producing a multifilament for splitting by melt-spinning a synthetic polymer, applying an oil agent after cooling, taking it up with a high-speed take-up roller, and then winding it up without substantially drawing it.
This is a method for producing a multifilament for splitting, which is characterized in that the multifilament is wound without being continuously rotated by one or more rollers in the same direction by 360° or more.

In the present invention, the winding speed is set to 4000 m/min, especially 5000 m/min, and no heat treatment is performed after the oil is applied, and two or more multifilament It is possible to divide into groups or monofilaments (single thread), converge and wind them just before winding.
This is preferable because it is extremely effective in improving the process condition during subsequent fiber separation. If the winding speed is less than 4000 m/min, stretching will often be required after winding, which is undesirable since it will be necessary to perform continuous 360° (or more) roller turns at the same time. many. Furthermore, if heat treatment is performed after applying the oil agent, yarn wobbling on the rollers will increase, migration will occur, and there is a strong tendency for fiber splitting properties to deteriorate.

According to a preferred embodiment of the present invention, the spun yarn Y melted and discharged from the spinneret 1 is uniformly cooled to a predetermined temperature by room temperature air blown out in the direction of the arrow from the cooling gas suita section 2, Next, it is introduced into a heating atmosphere at a predetermined temperature formed in the heating chamber 3, and after being uniformly heated in the atmosphere, it is treated with an oil agent by an oiling roller 4. Here, the yarn is divided on the oiling roller 4 by the dividing guide 5, and then transferred to a pair of godet rollers 7a while maintaining the Leahy division to the lower dividing guide 6.

7b at an angle of 360° without swirling, and after being focused by a focusing guide 8, it is wound up by a winder 9 at a predetermined speed. Here, when winding at a winding speed of 5000 TrL/min or more, the heating chamber 4 may be unnecessary.

e. Effects as described above According to the present invention, when the yarn is taken up, especially 4000
? When performing the direct spinning method at a winding speed of 7 L/minute or more, by spinning without making more than 3606 roller turns, it is possible to eliminate the false twist phenomenon that occurs on the rollers, and the subsequent It is possible to reduce the occurrence of "twisting" during the fiber separation process and improve fiber separation performance.

Furthermore, in the present invention, by employing direct spinning using high-speed spinning, the effect of reducing manufacturing costs due to this factor is exhibited. That is, productivity is high and spinning cost is low, and since conventional fiber splitting equipment can be used as is, capital investment can be reduced.

f, Examples Examples 1 to 3 Polyethylene terephthalate with an intrinsic viscosity of 0.64 to 285
The yarn is extruded from a spinneret 1 with a hole diameter of 0.55 m and a number of holes of 12 at a temperature of Y was once cooled down. Subsequently, the yarn was heat-treated to 200° C. in the heating chamber 3 and taken out from the heating chamber 3, and then treated with an oil agent using the oiling roller 4, and at the same time, the yarn was divided using the dividing guide 5.6. Next, the yarn was brought into contact with a pair of godet rollers 7a and 7b at 180 degrees each, and the yarn was collected by a focusing guide 8, and then wound by a winder 9 at a winding speed of 4500 m/min. The fineness after winding was 240 denier.

Example 4.5 In contrast to Example 1, the heating chamber 3 was not used and the winding speed was 60.
It was wound up at 00 m/min. The fineness after winding was 240 denier.

Comparative Examples 1 and 2 As comparative examples, roller turns were performed at 1200° and 960°, respectively, at a preheating roller temperature of 100°C and a heating roller temperature of 140°C, using a normal spinning direct drawing method, and a winding speed of 38°.
It was wound up at a speed of 0.007 FL/min. Fineness after winding is 240
It was denier.

Comparative Example 3 As a comparative example, a normal undrawn yarn was once produced, and the resulting undrawn yarn was subjected to a drawing process by being turned by a supply roller and a drawing roller by 1080°, respectively, to obtain a non-twisted drawn yarn. The fineness after winding was 240 denier.

Examples 1 to 5 above. The multifilaments for splitting obtained in Comparative Examples 1 to 3 were split at a splitting speed of 50077L using a splitting machine.
The fibers were split at a rate of 1/min, and the number of yarn breakages during fiber splitting was investigated. The results are shown in the table below.

(Margin below)

[Brief explanation of the drawing]

The figure is an explanatory diagram of a spinning process suitable for carrying out the present invention. 1... Spinneret, 2... Cooling gas blowing section, 3... Heating chamber, 4... Oiling roller, 5.6...・Divided guide, 7a, 7b・
・・・・・・Godet roller, 8・・・・・・Focusing guide procedure amendment document June 1980//Japanese Patent Office Commissioner 1, Indication of the case Patent application No. 1983 83844 2, Name of the invention” line Manufacturing method for multifilament 3 Relationship with the case of the person making the amendment Patent applicant Sashibe Okamoto, 1-11 Minamihonmachi, Higashi-ku, Osaka (300), Representative of Teijin Limited

Claims (1)

[Claims] 1. A synthetic polymer is melt-spun, cooled, applied with an oil agent, and taken up with a high-speed take-up roller, without being substantially stretched thereafter.
When winding up and manufacturing multifilament for splitting, one or more rollers are used to continuously roll 360° in the same direction.
A method for producing multifilament for fiber separation, characterized by winding without roller turning. 2. The method for producing a multifilament for fiber separation according to claim 1, wherein the winding speed is 4000 m 2 /min and the multifilament is wound without heat treatment after applying the oil agent. 3. Spun multifilament is divided into two or more multifilament groups or monofilaments after the oil agent is applied, and the fibers are divided into two or more multifilament groups or monofilaments immediately before winding. A method for manufacturing multifilament for use.