JPH06330403A - Oil agent application method - Google Patents

Abstract

PURPOSE:To provide a process for uniformly and quantitatively applying an oil emulsion to a running synthetic fiber bundle. CONSTITUTION:An oil emulsion is foamed to a density of preferably 0.001-0.1g/cm<3> and applied to a running synthetic fiber bundle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying an oil agent to synthetic fiber bundles such as polyester and polyamide. More specifically, it relates to a method of uniformly and quantitatively applying an oil emulsion to the running fiber bundle.

[0002]

2. Description of the Related Art In the production of synthetic fibers such as polyester and polyamide, smooth components are used in order to smoothly pass through post-processes such as spinning and non-woven fabric, or to impart useful surface characteristics to the final product. It is customary to apply an oil agent containing an antistatic component, a focusing component and the like. And
As a method of applying such an oil agent, conventionally, a kiss roll method, a metering and discharging method, a dipping method, a shower method, a spray method and the like have been adopted.

However, all of these methods have a problem in terms of uniform fixed amount adhesion. That is, the kiss roll method is a method in which the oiling roller portion is dipped in an oil agent emulsion and rotated at a constant speed to form a uniform oil agent emulsion layer on the roller surface, and then a running yarn is brought into contact with this roller. However, although the amount of oil agent adhered can be quantitatively controlled by changing the rotation speed of the roller, when the running yarn is a thick fiber bundle, the oil agent emulsion hardly penetrates into the inner layer and adhesion spots are likely to occur.

The metering and discharging method is a method in which a running yarn is brought into contact with a guide of a special shape having an oil agent discharging hole, and the oil agent emulsion (or straight oil agent) is metered and discharged to apply the oil agent. According to the method, the quantitative control of the adhesion amount is higher than that of the kiss roll method, but like the kiss roll method, when the running yarn is a thick fiber bundle, the oil agent hardly penetrates and adhesion spots easily occur.

The dipping method is a method in which a fiber bundle is run so as to be immersed in an oil agent emulsion liquid to impregnate the oil agent emulsion, and then an excess oil agent emulsion is squeezed out by a load roller. Although the adhesion unevenness in a small range is small, the adhesion amount easily fluctuates because the viscosity and concentration of the oil agent change due to various factors such as the temperature and humidity of the atmosphere and the temperature of the oil agent emulsion, and the quantitativeness is poor.

Further, the shower method is a method of pouring the oil agent emulsion into the running fiber bundle and then squeezing out the excess oil agent emulsion as in the dip method. large.

Further, the spray method is a method of spraying an oil emulsion onto traveling fiber bundles and has a low permeability of the oil and a large variation in the amount of the oil adhering, so that it is only used for auxiliary oiling such as additional oiling. .

[0008] As described above, none of the conventionally proposed and practiced oil agent applying methods can satisfy both uniformity and quantitativeness of adhesion at the same time when applied to a thick fiber bundle.

[0009]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and can uniformly and quantitatively apply an oil agent emulsion to a running thermoplastic synthetic fiber bundle, and also change the oil agent. It is an object of the present invention to provide a method for applying an oil agent which is simple and has little loss.

[0010]

The above object can be achieved by an oil agent applying method characterized in that, when an oil emulsion is applied to a running thermoplastic synthetic fiber bundle, the oil emulsion is applied in the form of foam. .

A general method for producing synthetic fibers to which the present invention is applied is, for example, polyester short fibers are produced by the following steps. That is, in the spinning step, the molten polymer is discharged from the spinneret nozzle to be spun and collected as a raw yarn sub-tow. Next, in the stretching step, a large number of the above-mentioned sub-tows are bundled to form a raw yarn tow, which is stretched under heating and then tension heat set if necessary, crimping, relaxation heat treatment, and each step of cutting to a predetermined fiber length. Manufactured. Then, in this step, the oil agent is applied at an arbitrary stage, but it is usually performed after stretching or after tension heat treatment.

In the present invention, it is important to apply such an oil agent by using a foamed oil agent emulsion. In particular, the foam density is 0.0 in terms of uniform application and quantitative application.
It is preferably in the range of 01 to 0.1 g / cm ³ .

The case where the present invention is applied after the stretching step will be specifically described below with reference to the drawings. As shown in FIG. 1, the foamed oil agent emulsion is applied to the fiber bundle that has been stretched in warm water between the first roller 1 and the third roller 3 and subjected to the tension heat treatment by the set roller 6. In the foaming of the oil agent emulsion, compressed air and a liquid oil agent emulsion are fed into the mixing head 10 and stirred to form a uniform foam, and a fixed amount is measured by the electromagnetic pump 11 and discharged from the foam discharge nozzle 12.

The oil agent emulsion used here is arbitrary as long as it is an aqueous emulsion which can be easily foamed. In general, it is difficult to make a straight oil agent into a foam, which is not preferable.

As the oil agent component, for example, anionic activators such as phosphates and sulfates, nonionic activators such as polyethers, cation activators such as quaternary ammonium salts, and amphoteric amphoteric agents such as betaine, which are components of ordinary spinning oil agents, are used. The activators may be used alone or in combination. In addition, as a leveling agent, alkyl esters, paraffinic hydrocarbons, dimethyl silicols and the like may be blended in an emulsion system.

[0016]

According to the manufacturing method of the present invention, since the oil emulsion is foamed, the specific gravity is light, and even if it is applied onto the traveling fiber bundle, it does not drip immediately and penetrates into the fiber bundle. In addition, since it is foamy and has a large surface area, the adhesion uniformity is remarkably improved. Further, since the foamed oil agent emulsion to be applied is all supplied to the fiber bundle, the quantification of the attached amount becomes extremely high,
In addition, since the foamy oil agent emulsion has a low apparent viscosity, even if the oil agent emulsion having a high concentration is used, it can be uniformly attached.

Further, a collecting device for the squeezing oil agent such as the dipping method is unnecessary, and a head tank for the oil agent emulsion,
The equipment such as piping can be downsized, and further, since it is not necessary to discard the oil agent remaining in the bath, loss is extremely small, and its industrial value is extremely large.

[0018]

EXAMPLE A polyethylene terephthalate chip having an intrinsic viscosity of 0.65 was melted at 300 ° C., passed through a die having 900 holes, a discharge rate of 480 g / min and a spinning speed of 1000 m.
Spinning was carried out at a speed of 1 / min. The undrawn yarn thus obtained was bundled into a tow of 1,500,000 denier, which was drawn in two stages of warm water at a total draw ratio of 3.41 and subjected to tension heat treatment at 170 ° C. to form a tow having a width of 80 mm. The oil agent was applied under various conditions by changing the oil agent emulsion concentration and the foam discharge amount. After that, crimping was applied and relaxation heat treatment was performed at 130 ° C. to obtain a tow having a single fiber denier of 1.56 de.
In order to see the variation in the amount of adhesion, the obtained tow was divided into three in the width direction and sampled from three locations along the length direction, for a total of nine locations. Further, these sample tows were divided into a surface layer portion and an inner layer portion to measure the amount of oil agent adhesion.

The method of measuring the amount of oil agent adhered is as follows:
Was extracted with a mixed solvent of methanol: benzene (1: 1) for 2.5 hours, the solvent was distilled off, the extract was redissolved in 0.5 cc of pure water, and the refractive index was measured. A method of applying the calibration formula obtained in step 1 to calculate the amount of adhesion was adopted. Table 1 shows the measurement results of the amount of the oil agent deposited on the tow by the method for depositing the oil agent of the present invention.

For comparison, Table 2 and Table 3 show the results of measuring the amount of the oil agent deposited on the tow when the dipping method and the spray method were used as the oil agent applying method, employing the same stretching conditions as described above.

Further, the relationship (average value) between the amount of adhering oil agent and the amount of ejected emulsion or the water content after tow drawing is shown in FIGS.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3]

As shown in Table 1 and FIG. 2, according to the method for applying an oil agent of the present invention, a substantially quantitative correlation can be obtained between the foam discharge amount and the oil agent adhesion amount over a wide range of the emulsion concentration from 5% to 20%. Also, variations in the tow width direction, the length direction, and the adhesion amount of the inner and outer layers are extremely small.

On the other hand, in the dipping method different from the oil applying method of the present invention, as shown in Table 2 and FIG. 3, the variation of the oil adhering amount in the tow is small, but the moisture content after the tow drawing and the oil adhering amount are small. It is difficult to control the adhered amount because the quantitative property between the two is low.

Further, in the spray method, as shown in Table 3 and FIG. 4, although there is some quantitativeness between the spray discharge amount and the oil agent adhesion amount, variations in the oil agent adhesion amount inside the tow, especially inside and outside the tow. The variation in the amount of the deposited layer is large and the uniformity is low. Furthermore, when comparing the amount of oil agent calculated from the spray discharge amount with the actual value of the amount of oil agent adhered, the latter is significantly lower, and it can be seen that the adhesion efficiency is low.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example in which the method for applying an oil agent of the present invention is applied to a step of drawing a thermoplastic synthetic fiber.

FIG. 2 is a diagram showing the relationship between the amount of foam deposited on a tow obtained according to the example of the present invention and the amount of oil adhered.

FIG. 3 is a diagram showing the relationship between the water content after tow squeezing of the tow obtained by the dipping method of the comparative example and the amount of oil agent adhesion.

FIG. 4 is a diagram showing a relationship between a spray discharge amount and an oil agent adhesion amount obtained by a spray method of a comparative example.

[Explanation of symbols]

 1 Stretching 1st roller 2 Stretching 2nd roller 3 Stretching 3rd roller 4 1st warm water bath 5 2nd warm water bath 6 Set roller 7 Oil head tank 8 Motor 9 Drive shaft 10 Mixing head 11 Electromagnetic pump 12 Bubble discharge nozzle 13 Crimper 14 Foam emulsion 15 Compressed air piping

Claims (2)

[Claims] 1. A method for applying an oil agent, which comprises applying the oil agent emulsion in the form of foam when applying the oil agent emulsion to a traveling synthetic fiber bundle. 2. The density of the foamy oil emulsion is 0.00.
1 to 0.1 g / cm ³The method of applying an oil agent according to claim 1.
Law.