JPH07310223A - Method for determining amount of oil attached to fiber yarn and apparatus therefor - Google Patents

Abstract

PURPOSE:To enable early finding of abnormality without damaging a yarn and remarkably decrease the loss of product by radiating near infrared rays to a running fiber yarn and effectively determining the amount of oil attached to the yarn from a value corresponding to the absorbance, etc., of the infrared rays. CONSTITUTION:The amount of an oil attached to a fiber yarn is determined by radiating near infrared rays of 1100-2500nm wavelength range to a fiber yarn 1 running at a speed of as high as >=3,000m/min and determining the amount of oil attached to the yarn from a value corresponding to the absorbance, transmittance or reflectance of the infrared rays. The determination is preferably carried out e.g. by using an apparatus composed of a means for generating the near infrared rays, a detection part 4 to irradiate the running fiber yarn 1 with the near infrared rays and detect the transmitted or reflected near infrared rays and a means for calculating the amount of oil attached to the fiber yarn by receiving the detection signal from the detection part 4.

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 measuring an oil agent attached to a fiber yarn. More specifically, the present invention relates to a measuring method capable of measuring the amount of an oil agent attached to a fiber online during the production of a fiber yarn and detecting and confirming the presence or absence of abnormality in real time.

[0002]

2. Description of the Related Art In general, synthetic fiber yarns such as polyester and nylon are prepared by melting a polymer, discharging it from a spinneret, cooling and solidifying the discharged yarn, and then applying a predetermined spinning oil agent to the yarn. , Manufactured. The oil agent applied in this yarn making process has various purposes, for example, the components are adjusted according to the purpose such as reduction of frictional resistance of the yarn, removal of static electricity, and imparting of flexibility, and are used properly. . The spinning oil agent is an important factor that controls various properties such as surface resistance and charging characteristics of the yarn, and the fact that a predetermined amount of the oil agent adheres evenly to the yarn makes it possible to manufacture the yarn stably and This is an important point in order not to cause trouble in the processing process.
Conventionally, the amount of oil adhered has generally been measured by taking a sample from a fiber that has been manufactured once and using a chemical method off-line. For example, a predetermined amount of fiber is sampled from a wound sample, boiled in a solvent such as methanol for a certain period of time, and the amount of oil attached is determined from the weight change before and after boiling (hereinafter referred to as solvent extraction method). Is the general method.

On the other hand, an online measuring method of the adhered oil agent by a super insulation resistance meter (hereinafter, referred to as "measurement amount of the fiber oil agent" is measured online instead of offline so that a countermeasure can be taken immediately when something abnormal occurs. Insulation resistance meter method) is known (for example, JP-A-58-54013, Example).

[0004]

However, when, for example, the amount of the attached oil agent of the fiber yarn is determined by the above solvent extraction method, it takes time until the result becomes clear, and if any trouble occurs immediately. However, there was a drawback that the loss of the product would be large because no countermeasure could be taken. Also, what is measured is the total amount of the oil agent attached. For example, among the components that make up the oil agent, there is no problem with the amount, but there is a change in its composition, or if some other component is wrong. However, when there is a problem such as being used for a long time, these abnormalities cannot be detected at all.

According to the insulation resistance measuring method, it is possible to measure the change in the amount of the oil agent and the change in the amount of the fiber in the longitudinal direction of the fiber, but it is possible to measure the change in the electric resistance of the running fiber yarn. Since the change in output power is measured, the measured value is greatly affected not only by the oil content but also by the water that is applied at the same time.In an extreme case, even if only water is applied, the electrical resistance value is within the specified range. In that case, there is a problem that it cannot be detected as an abnormality in the amount of the attached oil agent. Further, according to this method, since the electrode is applied to the traveling yarn to perform the measurement, there is a problem that the yarn is damaged during the measurement or the yarn is broken in an extreme case.

The object of the present invention is to solve the above-mentioned problems of the prior art, and to measure the amount of oil agent adhered and the change in the fiber longitudinal direction online and in real time without directly touching the running fiber yarn. And to provide the device.

[0007]

The structure of the present invention for achieving the above object is as follows. (1) Irradiation of near-infrared rays on a running fiber thread, and the adhesion of the fiber thread is determined from the numerical value corresponding to the absorbance, transmittance, or reflectance of the infrared ray. How to measure the amount of oil.

(2) Means for generating near-infrared rays, a detecting section for irradiating the running fiber yarn with near-infrared rays, and detecting transmitted light or reflected light of the near-infrared rays, and a detection signal from the detecting section. An apparatus for measuring the amount of oil agent adhered to a fiber yarn, which comprises means for receiving and calculating the amount of oil agent attached to the fiber yarn.

The present invention will be specifically described below. First,
A method for measuring the oil agent attached to the fiber yarn will be described. FIG. 1 is a schematic diagram for explaining the measuring method and apparatus of the present invention, in which 1 is a running yarn, 2 is a measuring apparatus main body (including a near infrared ray generator), 3 is a cable, 4 is a detecting section ( A means for irradiating near-infrared rays and a means for detecting transmitted or reflected light of the near-infrared rays are incorporated), and 5 is a computer for calculating the amount of oil agent adhesion and the like.

In the method of the present invention, first, prior to the measurement of the oil agent attached to the fiber thread, the correlation regression equation between the amount of the oil agent attached to the fiber thread and the absorbance (or transmittance) or reflectance of near infrared rays is obtained. That is, near-infrared rays on the fiber yarn treated with the oil agent,
Preferably, near infrared rays in the wavelength range of 1100 to 2500 nm are irradiated to obtain a near infrared spectrum. From the spectrum, about 1 to 3 types of wavelengths having a high correlation with the amount of the attached oil agent are selected. The selected wavelengths vary depending on the type of oil agent, the polymer matrix of the fiber, etc., but it is usually preferable to use at least one wavelength in the wavelength region near 1900 to 1910 nm. When the wavelength is selected here, the correlation regression equation between the amount of the applied oil agent on the fiber yarn and the spectral value of the near-infrared rays, which is determined by the conventional method, is calculated under the wavelength and stored in the computer. I will let you. When creating such a regression equation, a highly accurate regression equation is obtained by obtaining a second-order differential curve of the spectrum and using the value (second-order differential value), rather than using the measured near-infrared spectrum value itself. It is preferable because it can be obtained.

Next, for example, in order to measure the amount of the applied oil agent on the fiber yarn between the godet rollers while running, near infrared rays generated by the measuring device main body 2 are fed from the detecting portion 4 via the cable 3 from the detecting portion 4 as shown in FIG. Irradiate the yarn 1. At that time, the near-infrared spectrum light corresponding to the oil agent attached to the fiber yarn is detected by the detection unit 4. The detection signal is sent to the measuring device main body 2 and the computer 4 via the cable 3 and the change in the amount of the oil agent attached to the fiber yarn and the amount of the fiber attached in the longitudinal direction are calculated in real time.

The fiber yarn 1 referred to here is a synthetic fiber represented by polyester, nylon, etc., and is preferably applied to a fiber yarn running during a high-speed spinning process at a winding speed of 3000 m / min or more, and particularly, In the ultra high speed spinning process of 5000 m / min or more, the amount of the oil attached to the fiber yarn and the change in the amount of the fiber attached in the longitudinal direction are calculated in real time, and a remarkable effect can be exhibited without damaging the running yarn.

Next, a method of measuring the oil agent adhering to the fiber yarn package (hereinafter simply referred to as a package) being wound at a high speed will be described. FIG. 2 is a schematic view for explaining the method for measuring the oil agent adhering to the package of the present invention, its apparatus, and its apparatus, wherein 1'is the package being wound,
2 is a measurement value device body (built-in near-infrared ray generator, etc.), 3 is a cable, 4 is a detection part (built-in near-infrared ray irradiation means, near-infrared transmitted light or reflected light detection means), 5 is oil agent It is a computer that calculates quantities and the like.

First, as in the case of the running fiber yarn, the correlation regression equation between the amount of the attached oil agent on the package and the near infrared spectrum is obtained.

Next, as shown in the drawing, near infrared rays generated by the measuring device body 2 are irradiated from the detecting portion 4 to the package 1 '. At that time, the fiber yarn constituting the package detects the near-infrared reflected light corresponding to the attached oil agent by the detection unit 4, and the detection signal is sent to the measuring device main body 2 and the computer 4 to configure the package. The amount of the oil agent attached to the fiber yarn and the change in the amount of the fiber attached in the longitudinal direction are calculated in real time.

The method and apparatus of the present invention can be applied not only to the measurement of the amount of oil adhered, but also to the measurement of the chemical and / or physical properties of running fiber yarns or packages.

As used herein, the chemical properties of the fiber yarn include the limiting viscosity (molecular weight) of the terminal group, the amount of the third component copolymerized, the blended amount of the blended product, and the like. The physical properties of the fiber yarn include density, degree of orientation and the like.

The method of the present invention measures the above-mentioned chemical and / or physical properties of the fiber yarn or the package. Of these characteristics, the intrinsic viscosity of the fiber yarn will be taken as an example to explain. Prior to the above, similar to the case of the above-mentioned attached oil agent, from the near-infrared spectrum (wavelength region: preferably 1100 to 2500 nm) of the fiber yarn, about 1 to 3 kinds of wavelengths having a high detection ability of the intrinsic viscosity are selected. The selected wavelength depends on the chemical and physical properties to be measured, the polymer matrix of the fiber, etc. A correlation regression equation between the intrinsic viscosity and the absorbance (or transmittance) or reflectance of near infrared rays under the selected wavelength is obtained.

Next, as in the case of the above-mentioned attached oil agent, near-infrared rays generated by the measuring device main body 2 are probed by the probe 4.
To the running fiber yarn 1. At that time, near-infrared transmitted light or reflected light corresponding to the limiting viscosity of the running fiber yarn is detected by the probe 4, and the detection signal is sent to the measuring device main body 2 and the computer 4, and the running fiber is detected. Not only the intrinsic viscosity value of the yarn but also the change in the intrinsic viscosity value in the longitudinal direction of the fiber are calculated in real time. Of course, various properties other than the intrinsic viscosity can be measured according to the method for measuring the intrinsic viscosity.

[0020]

The present invention will be described in more detail with reference to the following examples. The amount of oil agent adhered by the solvent extraction method in this example was determined by the following method. Oil agent adhesion amount (solvent extraction method) 10 g of the yarn sample is dipped in 100 cc of methanol, the finishing oil agent is extracted for 3 hours, the methanol is removed after the extraction, and the product is dried, and the weight difference of the container before and after the extraction determines the yarn Calculate the amount of finishing oil applied.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.66 was dried by a conventional method and then melt-spun at a spinning temperature of 295 ° C.
After the yarn discharged from the spinneret is cooled and solidified by chimney air, the concentration of the oil agent consisting of the following composition is adjusted to 15 wt%, and it is applied to the running fiber by metering guide lubrication and collected at a take-up speed of 1500 m / min. 247 denier 3
An undrawn yarn of 6 filaments was obtained. <Oil agent composition (wt%)> Mineral oil 15 Oleyl laurate 45 Oleyl alcohol EO adduct 35 Lauryl sulfonate Na salt 5 A near-infrared probe is installed between the first and second take-up rolls to bring it close to the running fiber. Irradiate with infrared rays, 1100
Near-infrared spectra were collected in the range ~ 2500 nm. A NIRS 5000 spectrophotometer manufactured by NIR Systems, Inc. was used as the near infrared reflection measuring device.

In the above refueling, the amount of the applied oil agent on the yarn was changed by changing the amount of the supplied oil agent, and the near-infrared spectrum of each level of the applied amount of the oil agent was collected. A second derivative curve of the obtained spectrum was obtained. On the other hand, regression analysis was performed with the amount of oil agent adhesion measured by the solvent extraction method. As a result, as the most accurate regression equation,
A regression equation including the second derivative of the wavelengths of 1,1703, 2230 nm was obtained. The number of samples used when deriving the regression equation was 25 levels, and the correlation coefficient of the regression equation was 0.9.
It was 97.

Next, the amount of oil agent adhered to the yarn is set to a target of 0.
The above undrawn yarn was spun under the condition of 7 wt%. The near-infrared spectrum was obtained by the above-mentioned method, and the amount of the attached oil agent was obtained from the regression equation obtained previously from the second derivative curve. The amount of oil agent adhesion calculated according to the regression equation was 0.73 wt%, and the variation in the amount of oil agent adhesion in the longitudinal direction of the fiber was ± 0.06.
It was wt%.

When the amount of the oil agent supplied to the yarn is arbitrarily reduced, the amount of the oil agent adhered, which is apparently obtained from the regression equation, shows a change corresponding to the change in the amount of the oil agent supplied. Also,
If the oleyl laurate component of the above-mentioned oil agent is intentionally changed to 2-ethylhexyl stearate, the required oil agent adhesion amount is 1.35 wt% even if the oil agent supply amount is the same. Was detected as an abnormal value.

As described above, it was found that the method of the present invention can sufficiently detect the amount of the oil agent attached to the yarn and the change in the longitudinal direction of the fiber, the abnormality of the oil agent attachment amount, and the abnormality of the oil agent composition.

Comparative Example 1 Instead of using near-infrared rays, JP-A-58-54013
The oil adhesion state was measured under the same conditions as in Example 1 except that the super insulation resistance meter RM-21C manufactured by Yokogawa Hewlett-Packard Co. described in Japanese Patent Publication No. JP-A-2003-27921 was used. The change in the output of the super insulation resistance tester when the oil supply amount to the yarn was changed was measured in advance and the relationship between the output and the oil adhesion amount was obtained. Next, the yarn was produced under the condition that the target amount of the oil agent attached to the yarn was 0.7 wt%. In this case, the adhesion amount of the oil agent obtained by the super insulation resistance tester was 0.62 wt%, and the adhesion unevenness in the longitudinal direction of the fiber was ±
It became 0.01 wt%. Also, as in Example 1, the value measured by the super insulation resistance tester was 0.65 wt% when the oil agent in which one component was intentionally changed was used.

From the above results, the accuracy of the measured value is lower in the measurement of the adhered oil agent by the super insulation resistance meter as compared with the method of the present invention by the near infrared ray, and in the measurement by the super insulation resistance meter, the yarn is mainly used. Since the change in the resistance value of the thread is observed, it can be seen that the measured value depends on the moisture adhering to the thread, and even if the composition of the oil agent changes, it cannot be detected as an abnormality.

Example 2 The same measurement as in Example 1 was carried out by replacing the running yarn with the near-infrared rays directly, instead of the type of probe which was applied to the surface of the package being wound. The obtained regression equation was almost the same as that of Example 1, and the accuracy of measurement of the adherent oil agent by the regression equation was not different from that of Example 1.

Example 3 Under the same conditions as in Example 1, the spinning speed was changed to 300
The measurement was carried out at 0, 4000, 5000 and 6000 m / min. Similarly, the measurement by the super insulation resistance meter of Comparative Example 1 was also performed. Basically, following the procedure described in Example 1,
A regression equation was prepared at each level, and the amount of oil agent adhered when the amount of the oil agent that makes the theoretical amount of oil agent 0.7 wt% was supplied was measured according to the regression equation. The results are shown in Table 1.

[0030]

[Table 1] As is clear from Table 1, the method of the present invention (near infrared method) has higher measurement accuracy than the conventional method. Further, when applied to high-speed spinning at a spinning speed of 3000 m / min or more, fluff was generated during measurement by the conventional method, whereas no fluff was generated by the near-infrared method. It can be seen that even in high-speed spinning, no fluff or yarn breakage occurs, and the near-infrared method is particularly effective in the case of high-speed spinning.

[0031]

EFFECTS OF THE INVENTION According to the measuring method and measuring apparatus of the present invention, (1) the amount of the attached oil agent on the fiber yarn is determined online and in real time.

The amount of oil adhered without directly contacting the yarn,
It is possible to measure adhesion spots. This method exerts the following effects.

(2) Since various characteristics can be measured without contacting the fiber yarn, the yarn is not damaged. Especially when applied to high-speed spinning, the fluff and yarn breakage generated by the conventional method can be avoided.

(3) Various characteristics such as the amount of oil agent adhered can be measured with high accuracy. Further, it becomes possible to detect an abnormality of the oil agent component which cannot be detected by the conventional method.

(4) Since the oil agent adhesion state and the like can be grasped online and in real time, it is possible to detect abnormalities at an early stage, and the loss of products can be greatly reduced.

(5) The method and apparatus of the present invention can be applied to the on-line measurement of chemical properties such as IV and the amount of terminal groups and physical properties such as density and orientation, and is highly versatile.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a measuring method and an apparatus therefor according to the present invention (a measurement example of an oil agent adhering to a fiber yarn).

FIG. 2 is a schematic diagram for explaining another measuring method and apparatus of the present invention (measurement example of the oil agent adhered to the package).

[Explanation of symbols]

 1: Running fiber yarn (1 ': package) 2: Measuring device body 3: Cable 4: Detection unit 5: Computer

Claims (6)

[Claims] 1. A near-infrared ray is irradiated to a running fiber yarn,
A method for measuring the amount of oil agent attached to a fiber yarn, which comprises obtaining the amount of the oil agent attached to the fiber yarn from a numerical value corresponding to the absorbance or transmittance or reflectance of the infrared rays. 2. The method for measuring the amount of oil agent attached to a fiber yarn according to claim 1, wherein the near infrared rays are in the wavelength range of 1100 to 2500 nm. 3. The method for measuring the amount of oil agent attached to a fiber thread according to claim 1 or 2, wherein the fiber thread is a fiber thread running at a high speed of 3000 m / min or more. 4. The method for measuring the amount of oil agent attached to a fiber yarn according to any one of claims 1 to 3, wherein the fiber yarn is a fiber yarn being wound into a package. 5. The fiber yarn is a synthetic fiber, as claimed in claims 1 to 4.
The method for measuring the amount of the attached oil agent on the fiber yarn according to any one of 1. 6. A means for generating near-infrared rays, a detecting section for irradiating a running fiber yarn with near-infrared rays, and detecting transmitted light or reflected light of the near-infrared rays, and a detection signal from the detecting section. A device for measuring the amount of oil agent adhered to a fiber yarn, which comprises a means for calculating the amount of oil agent attached to the fiber yarn.