JPH0770861A - Apparatus for detecting abnormal part of elongation of filament yarn and method therefor - Google Patents

Abstract

PURPOSE:To rapidly and surely detect an abnormal part of elongation by draw ing a filament yarn to be measured in a specific draw ratio and simultaneously, recording change in the tension. CONSTITUTION:A filament yarn 2, e.g. nylon 6 flat yarn, to be measured, unwound from a wound yarn package 1 is passed through a guide 3 and wound several times around a transfer roller 4 and a separate roller 5 and then, wound several times around a drawing roller 7 and a separate roller 8 and taken off by a take-off means 11. In the above process, the change in tension measured by a tension measuring means 12 while drawing the filament yarn in a draw ratio S satisfying the relation 1+0.9S/100>=S1+0.65S/100 to average elongation S% of the above yarn 2 by a means 10 for subjecting the transfer roller 4 and the draw roller 7 to driving control in a prescribed peripheral speed ratio is recorded by a recording means 13. When an abnormal part of elongation exits in the yarn, the abnormal part of elongation can readily be detected, because tension of the part is changed by the above drawing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting an abnormal elongation portion of a filament yarn, which is capable of continuously detecting an abnormal elongation portion of a synthetic filament yarn.

[0002]

2. Description of the Related Art Generally, a synthetic fiber filament yarn is manufactured by melt-filtering a synthetic resin, extruding it from a nozzle, and winding it as a package through various guides and take-up means. However, in the produced filament yarn, if there is a foreign substance that has not been filtered by the filter or a modified product of synthetic resin, or if the yarn is damaged by rubbing with the guide, etc. An abnormal part of extensibility occurs. If the elongation is partially abnormal as described above, yarn breakage may occur in the feed portion when performing false twisting as a higher-order process thereafter, or yarn breakage may occur when knitting a tricot. When weaving, fluffing occurs and the quality of the product deteriorates and the operation rate decreases. Therefore, it is necessary to detect such an abnormal elongation portion promptly and surely before subjecting it to higher-order processing.

Conventionally, a material tensile tester (for example, "Tensilon" TYPE: UT-4, Goldwin Co., Ltd.) has been known as a device for detecting such an abnormal portion of the filament yarn elongation. This material tensile tester
Grasping both ends of the filament yarn to be measured of a specified length, pulling one end until the filament yarn breaks, measure the stress of the filament yarn corresponding to the elongation of the filament yarn, and there is an abnormal elongation part It was to decide whether or not to do it.

However, in the case where the extensibility abnormal portion frequently exists at least every several tens of meters in the longitudinal direction of the filament yarn, the extensibility abnormal portion can be easily detected by the above-mentioned measuring machine with a small number of measurements. In the case of a high-quality yarn that is present only at a low frequency of several hundreds to several thousands of meters, it cannot be detected with a small number of measurements. Therefore, it is necessary to measure several hundreds to tens of thousands of times, which requires a lot of time and labor, and there is a problem that the measurement is practically impossible.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to detect swollen portions of extensibility quickly and surely, even in high quality filament yarns in which the extensibility portions exist only infrequently. It is an object of the present invention to provide a method and a device for detecting an abnormal elongation portion of a filament yarn.

[0006]

A method for detecting an abnormal elongation of a filament yarn according to the present invention, which achieves the above object, comprises a filament yarn to be measured between a transfer roller and a stretching roller. Of the average elongation S (%) of 1 + 0.9S / 100 ≧ R ≧ 1 + 0.65S / 100
It is characterized in that the abnormal elongation portion is detected by continuously stretching at a stretching ratio R of

The filament yarn elongation abnormal portion detecting device of the present invention comprises a transfer roller for transferring the filament yarn to be measured, and a stretching roller for stretching the filament yarn transferred from the transfer roller. And a take-up means for taking up the yarn drawn by the drawing roller,
The transfer roller and the stretching roller are provided with drive control means for driving and controlling both rollers at a predetermined peripheral speed ratio.

As described above, in the present invention, the transfer roller and the drawing roller having different peripheral speed ratios are provided, and the filament yarn to be measured is continuously drawn at a predetermined draw ratio R between the transfer roller and the drawing roller. Therefore, the abnormal elongation portion can be detected by the fluctuation of the tension when the abnormal elongation portion is cut or the presence or absence of winding of the broken single yarn or all yarns around the roller. Therefore, even in the filament yarn in which the abnormal elongation portion exists at low frequency, the abnormal elongation portion can be detected quickly and reliably.

[0009]

EXAMPLE FIG. 1 is a schematic explanatory view showing an example of an apparatus for detecting an abnormal elongation of a filament yarn according to the present invention. The device for detecting an abnormal elongation, the filament yarn 2 to be measured unwound from the wound package 1 is passed around the guide 3 by the transfer roller 4 and the separate roller 5 several times, and then,
After being stretched around the stretching roller 7 and the separate roller 8 having a peripheral speed higher than that of the transfer roller 4 several times and stretched,
It is configured to be collected by the collecting means 11.

Reference numeral 10 denotes drive control means for driving and controlling the transfer roller 4 and the stretching roller 7 at a predetermined peripheral speed ratio (stretching ratio). The drive control means 10 can set various peripheral speed ratios by rotationally driving the transfer roller 4 and the stretching roller 7 at respective speeds by the motors 6 and 9 connected to the control unit 10a. ing.
Further, 12 is a tension measuring means for measuring the tension of the filament yarn 2. The tension measuring means 12 is provided between the transfer roller 4 and the drawing roller 7 and detects the tension of the filament yarn 2 drawn by the rollers 4 and 7. The fluctuation of the tension measured by the tension measuring means 12 is recorded by the recording means 13.

By driving and controlling the transfer roller 4 and the drawing roller 7 by the motors 6 and 9 so as to have a predetermined peripheral speed ratio, the filament yarn 2 is continuously drawn and transferred at a predetermined draw ratio R. Due to the stretching at this time, if there is an extensibility abnormal portion in the filament yarn 2, the tension at that portion will have an abnormally large fluctuation, and if the degree of abnormal extensibility is large, it will be cut. By winding the broken single yarn or the whole yarn around the roller, the abnormal elongation portion can be easily detected. Since the detection process is performed while continuously supplying the measured filament yarn 2 in this way, even in the case of the filament yarn 2 in which the abnormal elongation portion occurs only infrequently, the abnormal elongation portion is detected. It is possible to detect quickly and reliably.

In the present invention, the draw ratio R is based on the average elongation S (%) of the filament yarn 2.
It is preferable to set in the range of 1 + 0.9S / 100 ≧ R ≧ 1 + 0.65S / 100. This is because in order to maintain high-order passability that allows processing without causing thread breakage in higher-order processing of synthetic fiber filament yarn, the lower limit of the elongation abnormality is set as 65% to 90% of normal yarn. It depends on what is done. If the draw ratio R is less than 1 + 0.65 S / 100, abnormal yarns during high-order processing are overlooked. Further, if the draw ratio R is larger than 1 + 0.9 S / 100, it is not preferable because the filament yarns that have no problem in high-order processing are excessively detected. Here, the average elongation S is a synthetic fiber filament yarn, which is repeated 14 times every 5 m by a tensile tester to measure a 14-value breaking elongation, and an intermediate value excluding 2 upper and 2 lower values. An average value of 10 values. Generally, the average elongation S of synthetic fiber filament yarn is 20% to 10
It is usually about 0%.

According to the present invention described above, for example, the average elongation S
When evaluating the high-order passability of a multifilament having a ratio of 40%, the peripheral speed of the transfer roller 4 is set to a predetermined value (for example, 600
m / min) and the peripheral speed of the stretching roller 7 is 1.3 times the peripheral speed of the transfer roller 4 (780 m / min).
min) and stretch between both rollers for a specified time.
(For example, 5 min) Continue. By this stretching operation, the measured filament yarn 2 is stretched by 30% between the transfer roller 4 and the stretching roller 7, but the measured filament yarn 2 has an abnormal elongation portion of 30% or less. When it has, the single yarn or the whole yarn is in the roller 4,
Cut between 7 or wrap around either roller.

In the present invention, for example, the peripheral speed of the transfer roller 4 is 100 to 1200 m / min, and the measurement time is 1
When the filament yarn 2 is continuously stretched for 10 to 10 minutes, 100 to 12 in the length direction of the filament yarn 2.
It is possible to continuously detect the abnormal portion of elongation during 000 m. The measuring time is preferably 1 to 10 minutes, but is not limited to this and may be changed depending on the yarn type.

The above tension measuring means 12 and recording means 13
Does not necessarily have to be installed in the apparatus of the present invention, but more accurately detects a cut portion or an abnormal elongation portion of the filament yarn 2 in the stretching between the transfer roller 4 and the stretching roller 7 to detect a quality abnormality. It is preferably installed for use in trend management, aging, yarn characteristic analysis, and the like. Also,
When a conventionally known contact measuring means is used as the tension measuring means 12, the drawing stress is reduced when heat is applied to the filament yarn 2 and the detection force of the tension measuring means 12 is lowered, so that the normal temperature drawing is performed. Is good.

Although the drive control means 10 is configured to control the speeds of the motors 6 and 9 of the transfer roller 4 and the stretching roller 7 in the above-mentioned embodiment, the drive control means 10 is not limited to this, and the means is not limited thereto. Needless to say, any means may be used as long as it can drive the peripheral speed of the stretching roller 7 faster than the transfer roller 4 by a predetermined magnification.

The filament yarn 2 to be measured to which the present invention is applied is not particularly limited as long as it is a filament yarn made of synthetic resin, but it is highly advanced in temporary twisting, warping, knitting, weaving, sewing and the like. Nylon, which requires the next passability,
It can be suitably used for synthetic fiber yarns such as polyester, polyolefin and acrylic. In particular, it is preferably applied to nylon yarns for clothing, which have a high dependency on the original yarn elongation in high-order passability.

Using the apparatus of the present invention, nylon 6 containing 2.0% by weight of titanium oxide and having a relative viscosity of 98% sulfuric acid of 2.6 was melt-spun and cooled, and an oil agent was applied by a guide oil supply device. It is taken up by the first godet roller, subsequently taken by the second godet roller, and stretched by a factor of 1.5 between the first and second godet rollers, and then continuously heated on the second godet roller. After heat treatment at 190 ° C., it was wound into a 7.0 kg drum package at 5000 m / min with a spindle drive type winder.

The wound nylon 6 flat yarn is
It is 50 denier 17 filaments. The average elongation of the yarn was 45%. Using the visual judgment, the conventional method and the method of the present invention, the elongation abnormal portion was detected, and the tricot knitting evaluation and the like were carried out as follows. The following table shows the results obtained by reflecting the detection rate of elongation abnormality in each inspection and the detection results in the tricot knitting process.

That is, as for the level 1, all the appearances of one creel were visually inspected to evaluate the tricot knitting. No abnormalities in elongation could be found in this visual inspection (discovery rate: 0%), and thread breakage occurred frequently during tricot knitting. In Level 2, the tensile tester was used to measure the drum for the entire weight of the production facility 30 times every several meters, and the detection rate of abnormal yarns with an elongation of 35% or less was 1.0%. It was One creel was obtained by removing the defective yarn and replacing the yarn guides used to manufacture the yarn, and then confirming that the yarn had no abnormal elongation under the same conditions using a tensile tester. , Tricot knitting evaluation was carried out. As a result, yarn breakage of 7.8 times / count occurred during knitting, which was also incomplete in the inspection by the tensile tester.

Level 3 uses the apparatus of the present invention, the drum for all the weight of the production equipment is 600 m / min for the transfer roller, 810 m / min for the stretching roller, the magnification is 1.35 times, and the measurement time is 5 min. Abnormality: A measurement was made of a yarn that had a variation of -8 g or more and a yarn wound around a roller, and the abnormality detection rate was 8.0%. The yarn path guide of the weight producing the yarn in which the abnormality is detected by the inspection of the level 3 is replaced, and the yarn is wound in the same manner. As a result of measurement under the measurement conditions, no abnormal elongation portion was detected. As a result of tricot knitting evaluation using one creel using this yarn, the number of yarn breakage during knitting was 1.5 times / counter.

[0022]

[0023]

As described above, the present invention detects the presence or absence of breakage by orbiting a filament yarn to be measured around a transfer roller and a stretching roller having different peripheral speed ratios and continuously stretching the filament yarn at a predetermined stretching ratio. Therefore, even in a high quality filament yarn in which the abnormal elongation portion is present at a low frequency, the abnormal elongation portion can be detected quickly and reliably.

If the tension measuring means for measuring the tension of the filament yarn to be measured and the recording means for recording the fluctuation of the measured tension are installed, the position of the abnormal elongation portion can be detected more accurately. Therefore, the quality control of the filament yarn can be performed with extremely high accuracy.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an example of a device for detecting an abnormal elongation of a filament yarn according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 wound package 2 filament yarn to be measured 4 transfer roller 6 motor 7 drawing roller 9 motor 10 drive control means 10a control section 11 take-up means 12 tension measurement means 13 recording means

Claims (3)

[Claims] 1. The filament yarn to be measured between the transfer roller and the drawing roller is 1 + 0.9 S / 100 ≧ R ≧ 1 with respect to the average elongation S (%) of the filament yarn to be measured.
A method for detecting an abnormal elongation portion of a filament yarn, which comprises detecting the abnormal elongation portion by continuously drawing at a draw ratio R of +0.65 S / 100. 2. A transfer roller for transferring the filament yarn to be measured, a stretching roller for stretching the filament yarn transferred from the transport roller, and a take-up means for taking up the yarn stretched by the stretching roller. An apparatus for detecting an abnormal portion of the filament yarn elongation, comprising drive control means for driving and controlling both the transfer roller and the stretching roller at a predetermined peripheral speed ratio. 3. A tension measuring means for measuring the tension of the filament yarn to be measured is provided between the transfer roller and the drawing roller, and a recording means for recording the fluctuation of the tension measured by the tension measuring means. The filament yarn filament elongation abnormality detecting device according to claim 2, wherein the device is provided.