JP2906678B2 - Direct spinning and drawing method for synthetic fibers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial applications]
. The present invention relates to a method for directly spinning and drawing synthetic fibers, and more particularly, to a method for directly spinning and drawing synthetic fibers capable of stably and efficiently producing high-strength synthetic fibers suitable for industrial materials. .

[0002]

2. Description of the Related Art In a direct spin drawing method for synthetic fibers,
In particular, as a method for simultaneously stretching and heat-treating a plurality of yarns, a method described in JP-A-63-165513 is known.

[0003] Japanese Patent Publication No. 44-4647 discloses a method of drawing a synthetic fiber using a drawing roller in which a plurality of rollers are alternately arranged up and down to take up a yarn. Things are known.

[0004] Further, as a roller in which a part of the stretching roller has a matte surface, a roller as described in JP-B-42-8727 has been known.

The direct spinning and drawing method of synthetic fiber described in the above-mentioned Japanese Patent Application Laid-Open No. 63-165513 is a method in which a yarn is wound a plurality of times by using a Nelson roller to perform drawing and heat treatment, and heat transfer is good. However, when a plurality of yarns are simultaneously wound and subjected to stretching and heat treatment, the length of the roller becomes extremely long, and the yarn at the time of threading work normally travels and comes into contact with the roller first. The end of the roller far away from the position is threaded with a rope, and the support portion moves abruptly toward the roller on the surface of the roller. Have issues.

[0006] This phenomenon occurs particularly in the case of a roller which is spun and used for the first drawing, since the yarn in contact with the roller is an undrawn yarn, the yarn width on the roller is wide and the strength is low. Therefore, single yarn breakage is likely to occur.

Further, in the case of the roller used for the first drawing, the yarn width is wide not only during the threading but also during the operation, and the roller is wound with the thread 7 to 8 times. In order to prevent a part of the yarn running adjacently on the top, for example, a part of the yarn that is wound first and running and a part of the yarn that is wound 360 degrees and then run from contacting, The length of the roller is further increased, and the occurrence of thread breaks and single thread breaks during the above-described threading increases.

In order to improve productivity by running a plurality of yarns in parallel, the length of the roller is extremely increased, and the higher the running speed of the yarn, the more the yarn is transferred to the roller. Has to be increased.

On the other hand, when the roller is lengthened and rotated at a high speed, the leading end of the roller is swung, and the yarn path of the running yarn becomes unstable, and the quality of the obtained yarn varies. And the roller shaft is not cut off due to roller run-out, the roller shaft is cut,
Even after the roller itself falls, a phenomenon that the roller rolls around on the floor due to the inertial rotation occurs, which has a problem in safety.

Therefore, especially when a plurality of yarns are simultaneously run in parallel for drawing and heat treatment, there is a limit to the rotation speed of the roller for speeding up.

Japanese Utility Model Publication No. 44-4647 describes a roller used for drawing a synthetic fiber. A plurality of rollers are alternately arranged up and down, and the yarn is meandered by these rollers. The diameter of each roller is gradually reduced according to the traveling direction of the yarn,
This is to reduce the winding of the running yarn.

However, if the diameter of the roller is gradually reduced in accordance with the traveling direction of the yarn and the tension is sequentially reduced, the yarn is not substantially stretched, and a high-strength yarn cannot be obtained. It is merely running on a roller that rotates independently.

[0013] Also, as described above, a single thread is applied to the roller.
In the case of stretching with high tension, there is a problem that in order to perform high-magnification stretching as a high tension, the yarn slips on the roller and cannot be subjected to high-magnification stretching, and a high-strength synthetic fiber cannot be obtained. I was

Japanese Patent Publication No. 42-8727 discloses a fixing pin which has a matte surface and which is heated by flowing steam or a heat medium into the inside, a separation roller having a matte surface, and a matte surface at the end face. In combination with a draw roller which is a mirror surface, the drawn yarn is threaded one or more times from the pear surface of the draw roller to the heating pin, and then one or two times from the pear surface of the draw roller to the separation roller. method of processing thermoplastic synthetic fiber winding Te are described in section a satin surface of the stretching roller is by reducing the frictional resistance between the yarn and roller to reduce the tension of the <br/> yarn, heat , The strain due to drawing is released, and the residual shrinkage of the obtained yarn is reduced.

However, when stretching and heat treatment are performed simultaneously and continuously using a Nelson roller, it is the same as the method described in the above-mentioned JP-A-63-165513. There are problems such as difficulty in threading, yarn breakage, and frequent occurrence of single yarn breakage.

[0016]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional direct drawing method of synthetic fiber, stabilize the drawability, facilitate the threading operation, and improve the thread breakage and the single threading. It is an object of the present invention to provide a method for obtaining a synthetic fiber with less thread breakage.

Another object of the present invention is to provide a method for directly spinning and drawing a synthetic fiber in which a plurality of spun undrawn yarns are simultaneously drawn to improve production efficiency.

[0018]

Means for Achieving the Object To achieve the above object, the present invention has the following arrangement. That is, in the direct spinning and drawing method of synthetic fiber, the spun, cooled, and lubricated yarn is taken at 300 m / min or more, and subsequently subjected to multi-stage drawing and heat treatment using a plurality of sets of rollers. Then, at the time of winding at a speed of 2000 m / min or more, at least one set of the heating rollers among the above-mentioned roller groups has a mirror surface with a roughness of 1S or less and a surface with a roughness of 4S or less.
Or it consists of a roller without the textured surface of 8S, subjected to the yarn over pieces in roller without said textured surface to subsequently Shi subjected pieces in roller without said mirror surface to stretch and heat treatment This is a method for directly spinning and drawing synthetic fibers .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Yarns composed of a plurality of synthetic fibers spun from spinnerets attached to a plurality of spinning sections provided in a melt spinning machine are passed through cooling sections independently of each other, and Cooling is performed by cooling air blown in a direction substantially perpendicular to the running direction, and then an oil agent is applied at a refueling section, and is taken off at a speed of 300 m / min or more.

The drawn yarn is subjected to multi-stage drawing and heat treatment using a plurality of roller groups, and then wound at a high speed of 2000 m / min or more.

A row for performing the above stretching and heat treatment.
La group forms a group by each two or more rollers, the roller forming these groups are tuned rotational speed, rotates the speed.

At least one heating roller group among the above-mentioned rollers rotating at the same speed includes a roller whose surface is a mirror surface having a roughness of 1S or less and a roller whose surface is a matte surface having a roughness of 4S to 8S. The running yarn that has been formed is first hanged on a heated mirror surface roller having a roughness of 1S or less, and then is hanged on a matte surface roller having a roughness of 4S to 8S. The winding angle of the yarn is set to 1 for the yarn winding operation and gripping efficiency .
It is desirable that the angle be in the range of 20 degrees to 240 degrees. This addition
The temperature of the heat roller group is usually used for stretching and heat treatment.
The temperature to be adopted can be set.
The temperature is 110-150 ° C, the temperature of the pear ground roller is 180
What is necessary is just to set to -240 degreeC.

[0023] The yarn passing through the roller group by combination with the mirror surface roller and mat surface roller, the rollers moves from a thermal processing roller to another roller group or winding device.

The roller group formed by the combination of the above-mentioned mirror surface roller and the satin surface roller is a roller group in which the yarn is drawn first, that is, when used for the first drawing roller, the yarn is thick. , The longest roller in the conventional method of winding the yarn a plurality of times can be extremely short.

When the surface roughness of the mirrored roller in which the mirrored roller and the matte surface roller are combined exceeds 1S, or when the surface roughness of the matt surface roller is out of the range of 4S to 8S, Smooth stretching and heat treatment are not performed.

When the surface roughness of the mirror-finished roller exceeds 1S, even if the surface roughness of the other satin surface roller is maintained within the range of 4S to 8S, the yarn does not slide on the roller and is not gripped. When used, uniform stretching cannot be performed.

The surface roughness of the mirror roller is set to 1S or less,
In the case of a drawing roller group in which the surface roughness of the other pear-skin roller is less than 4S, the frictional force between the running yarn and the roller group becomes large, and when a single yarn breaks, the yarn is immediately wound around the roller and the entire yarn is wound. It induces cutting and reduces stretchability and productivity.

Further, the surface roughness of the textured surface roller definitive stretching roller group exceeds 8S, the yarn which is subjected piece has a small contact area between these rollers of the roller surface, the yarn from the roller A phenomenon such as slippage of the yarn on the roller occurs due to a decrease in heat transfer to the yarn and a decrease in the gripping force of the yarn, resulting in a decrease in stretchability and a failure in uniform stretching.

The surface roughness of the mirror roller is set to 1S or less,
In the case of a heat treatment roller in which the surface roughness of the other matt surface roller is less than 4S, the frictional force between the running yarn and the roller group becomes large, and a constant length heat treatment is performed to eliminate the distortion generated during stretching. Can not be done.

Further, when the surface roughness of the satin finish roller in the heat treatment roller group exceeds 8S, the one-sided yarn has a small contact area with the roller surface of the roller group, and the yarn from the roller is small. The transfer of heat to the yarn is hindered, and the heat treatment by singling the yarn becomes substantially impossible.

The method of the present invention is applied to a method using a high-molecular polymer to be melt-spun as a raw material, and is particularly effective for synthetic fibers having a large fineness used as industrial materials.

The high-molecular polymer is preferably applied to obtain high-strength synthetic fibers of 9 g / d or more, such as polyamide fibers and polyester fibers, which are particularly suitable as industrial materials.

The method of the present invention are those particularly effective in the effect when a plurality of yarns subjected to stretching your <br/> by beauty heat treatment, further wherein the plurality of yarns 4 a large number present or present, the 4 or more yarns concurrently stretching and
Effect of the action during the heat treatment is remarkable.

[0034]

The present invention will now be described more specifically with reference to examples.

Example 1 Nylon 6 pellets having an intrinsic viscosity of 3.80 were independently melt-spun using four ferrules each having 204 holes, and the cooled and lubricated yarn was rotated at a peripheral speed of 600 m / min. 4 take-up rollers with the same take-off roller
The length 150 is a surface roughness of 0.6S rotating at a speed of / min.
The mirror roller maintained at 130 ° C. is wound with a winding angle of 200 °, and the first roller group is formed by using the same mirror roller as the driving source.
The surface roughness that rotates in minutes is 6mm
The yarn is rolled at a winding angle of 180 degrees on the matt roller maintained at 220 ° C., and the yarns are stretched 3.5 times while running in parallel without crossing each other. Each thread is wound a plurality of times without crossing the second roller group that is set to 1.5 times the group and forms a heated Nelson, and is stretched while being run in parallel. A third roller group that forms Nelson heated to 210 ° C. at 0.98 times the number of the roller groups described above, heat-treats the rollers in parallel, and winds each of the yarns independently. And wound up.

Example 2 Nylon 6 pellets having an intrinsic viscosity of 3.80 were melt-spun independently using six 136 holes, and the cooled and lubricated yarn was rotated at a peripheral speed of 500 m / min. 6 take-up rollers with the same take-off roller
Length of 200S rotating at a rate of / S of 0.2S
The mirror roller maintained at 130 ° C. is wound with a winding angle of 180 °, and the first roller group is formed by using the same mirror roller as the driving source. The peripheral speed is 1850 m / m.
The surface roughness that rotates in minutes has a length of 6 mm and a length of 200 mm.
A single winding at a winding angle of 180 degrees is performed on the matte ground roller maintained at 220 ° C., and the six yarns are stretched 3.7 times while running in parallel without crossing each other. First
Is set to 1.38 times that of the roller group, and the second roller group that forms the heated Nelson is stretched while being wound a plurality of times without crossing each other and running in parallel with each other. One-sided winding at a winding angle of 180 degrees is performed on a 200 mm-long mirror surface roller having a surface roughness of 0.2 S and rotating at a peripheral speed of 0.98 times that of the second roller group. Using a mirror roller and a drive source, the third roller group is formed. The surface roughness is made of 6S. After performing heat treatment while running side by side without crossing, it was guided to a winder and wound up.

COMPARATIVE EXAMPLE 1 Of the conditions in Example 1, the surface roughness of the mirrored rollers forming the first roller group was set to 1.2S, and the nylon 66 fiber was directly spun and drawn. It was not possible to obtain a high draw ratio of the eye, and even when the draw ratio was lowered, there were many single yarn breaks and yarn breaks, and it was not possible to obtain nylon 66 fibers having poor yarn-making properties and uniform quality.

Comparative Example 2 Of the conditions in Example 1, the surface roughness of the satin-finished roller forming the first roller group was variously changed, and nylon 6 was used.
As a result of direct spinning and drawing of the 6 fibers, when the surface roughness of the pear ground roller is 3.0S, not only single yarn breakage and yarn breakage are caused but also poor yarn-making properties are obtained, but also high quality, high quality nylon 66 fiber is obtained. In the case where the surface roughness of the satin finish roller was 9.0 S, the quality of each yarn obtained had a large variation, and high-strength nylon 66 fiber could not be obtained.

Example 3 Nylon 66 fibers were obtained by using the direct spinning and drawing method by changing the surface roughness of the rollers forming the first roller group in Comparative Examples 1 and 2. Nylon 6 obtained
6 The surface roughness of the mirror-finished roller is set to 1S or less from the quality of the fiber and the spinning property,
S has been found to be preferred.

[0040]

[Effect of the Invention] without lengthening the rollers used for stretching your <br/> by beauty heat treatment of synthetic fibers according to the method of the present invention, single yarn breakage or yarn breakage of the synthetic fibers due to vibration of the lengthening the roller The synthetic fiber obtained by reducing the quality of the fiber is of high quality and high quality, and is easy to thread.

Further, according to the method of the present invention, in a state synthetic fibers which simultaneously stretching Oyo beauty heat treatment stable a plurality of, yet can be small variations in the quality of each yarn can be produced at high magnification, High quality and high quality synthetic fibers can be obtained.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) D01D 10/00

Claims (3)

(57) [Claims] In a direct spinning and drawing method for synthetic fibers, a spun, cooled, and lubricated yarn is taken at a speed of 300 m / min or more, followed by multistage drawing using a plurality of roller groups. upon wound at 2000 m / min or more after heat-treated, at least one set of pressing of said rollers
The heat roller group includes a roller having a mirror surface having a roughness of 1S or less and a roller having a matte surface having a roughness of 4S to 8S. then direct spinning drawing method of synthetic fiber characterized by subjecting the stretched Contact <br/> by beauty heat treatment and over-levered rollers without said textured surface. 2. A direct spinning drawing method of synthetic fiber according to claim 1, characterized by applying beauty heat treatment Oyo stretching plurality of yarns simultaneously. 3. A direct spinning drawing method of synthetic fiber according to claim 1, characterized in that four or more simultaneous stretching and heat treatment the yarn is subjected.