JPH0672322B2 - Oil-added head - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for quantitatively applying an oil agent to thermoplastic synthetic fibers such as polyamide and polyester, and particularly to an apparatus for applying an oil agent to a melt-spun high-speed yarn. Regarding

<Prior Art> In recent years, as a measure for improving equipment productivity in accordance with the progress of melt spinning technology, research on porosity of a spinneret and high take-up speed has been actively conducted. There is also a tendency for finer denier as the spinneret becomes porous.

On the other hand, as a method for applying an oil agent in such melt spinning, (i) a method in which a yarn is brought into contact with the surface of a roller that is partially immersed in the oil agent and rotates to apply the oil agent, (ii) supply of an oil agent For example, there is a method of using a rod-shaped guide having at least one linear slit exhibiting a minute width and pressing the running yarn against the linear slit to attach the oil agent flowing out. When the method (i) is used When spinning is performed using a porous spinneret, it is necessary to focus the yarns by a focusing guide between the spinneret and the oil agent applying device, but at a high speed, particularly a take-up speed of 3500 m / min or more. In this case, rubbing between the yarn and the guide is likely to cause single yarn fluff, which is not preferable.

Further, the scattering of the oil agent due to the accompanying air flow is also a problem.

In the case of the method (ii), there is no problem if the single yarn is a normal denier, but if the single yarn is 1 denier, especially 0.5 denier or less and the take-up speed is 3500 m / min or more, oil spots are likely to occur, There are problems such as frequent single yarn breakage. In this case, the yarn contact surface is usually finished to a predetermined surface roughness, but the conventional yarn contact surface is not satisfactory because the yarn breakage easily occurs and the quality is uneven.

<Object of the Invention> The present invention is an apparatus for solving such a problem, and capable of applying a stable oil agent without damaging the yarn quality and without causing troubles such as yarn breakage even in melt spinning at high speed and fine denier. It is intended to provide.

<Structure of the Invention> That is, the present invention is an apparatus for continuously applying an oil agent to a yarn by causing a thread to run in contact with an oil agent applying head that discharges a fixed amount of the oil agent at a spinning speed of 3500 m / min or more. % Of Al ₂ O ₃ with a particle size of 1 micron or less is fired, and the yarn contact surface has a maximum height (RT) of 2 to 6 microns by polishing spherical abrasive grains. The oil agent applying head is characterized in that it has a height and is processed so that the peak peak count (PPI-P) satisfies the following expression.

PPI-P (pieces / inch)> 200-250C 0.8> C ≧ 0 C: Cutting level (micron) In the present invention, U which is usually a convexly curved yarn contact surface
Alternatively, a V-shaped guide groove is used, but the material is
It is necessary that the ceramic contains 92% or more of Al ₂ O _3, and if it is less than this, the wear is severe and it is not preferable in terms of long-term operation stability. Furthermore, the surface roughness of the head yarn contact surface is 2 to 6 microns at the maximum height (RT), and the number of peaks within a certain range is more than the specified number, that is, the peak peak count (PPI-P) is 200-250C. It is necessary that the number is (pieces / inch) or more. C is the cutting level (reference level, in units of microns), which is the height from the center line of the roughness curve, and 0 ≦ C <0.8.

The present inventor focused on the fact that the surface roughness of the yarn contacting surface of the oil material application head was the most important item, and while conducting various tests, the surface roughness was regulated by the maximum height (RT). Is effective, but more important is the maximum height (R
If the number of peaks (mountain peak count) within a certain range is regulated together with T), the most effective fact has been found and the present invention as described above has been achieved.

Fig. 6 shows that the single yarn denier is 0.5 or less (32de / 72fil, 35de / 72f
il) shows a large number of test results and shows an example in which fluff is hardly generated (○ mark), a large amount of fluff is generated, or a yarn breakage easily occurs and stable spinning cannot be performed (×, Δ mark). From this figure, the boundary lines marked with O and X are the above formulas, and it is shown that it is difficult to stably obtain a high quality yarn in the range below the line. The mark Δ indicates the one that has been conventionally used.

In this case, it is necessary that the surface roughness (RT) and the peak number of peaks are simultaneously within the range defined by the present invention, and if any one of them is out of the range, the desired effect of the present invention is obtained. It is difficult to get. If the surface roughness is less than 2 at RT, the abrasion resistance of the yarn-contacting surface becomes large, resulting in frequent occurrence of single yarn fluff, and if RT exceeds 6, the uniformity of the oil film formed by the spilled oil agent is impaired. As a result, spots where the oil film is insufficient are generated at the same time as the oil agent adhesion spots, and single yarn fluff is likely to occur.
Furthermore, if the peak peak count is less than 200-250C and the PPI-P is less than 200-250C, even if the surface roughness is within the specified range, the uniform dispersibility of the oil agent and its holding power are lacking, and the current state of oil film destruction occurs due to high-speed yarns There is a strong tendency to have many fluffs.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a specific example of the present invention, and FIGS. 2 and 3 are a sectional view and a plan view taken along the line AA of FIG. In the figure, reference numeral 1 is a head main body, which is made of ceramic containing 92% or more of Al ₂ O ₃ , and has a yarn guide surface 3 formed in a V (or U) shape on the front surface thereof. A yarn traveling path (groove) 2 formed of a curved surface having a V shape or a convex shape formed on a bottom surface (back portion) 4 of 3 is provided. On the inclined surface 5, which is the upper position of the curved surface, an oil agent outlet hole 6 that is provided at the rear portion and communicates with the hollow oil agent supply chamber 7 is opened. FIG. 4 is a plan view showing another example (U-shaped guide surface). FIG. 5 is a process explanatory view of a melt spinning apparatus having an oil agent applying device 13 to which the oil agent applying head of FIG. 1 is attached, and in the figure, a spinneret 11
The yarn Y discharged from the above passes through the cooling zone 12, and after being cooled and solidified, a predetermined amount of oil agent is applied by the oil agent applying device 13. Next, after being focused through the auxiliary guide 14, it is taken up at a predetermined speed by the godet rollers 15 and 16 and taken up by the winder 17.

Here, in the present invention, as described above, the oil agent applying head is
It is made of ceramic consisting of 92% or more of Al ₂ O ₃ and the yarn contact surface is regulated to have a specific surface roughness and number of peaks. For this reason, the yarn contact surface becomes a surface in which fine mountains are densely packed, and the dispersibility of the oil agent and the oil film retaining property are good, and the single yarn does not get in between the mountains, which makes it suitable for riding on a small mountain. Even if the yarn runs at high speed, the oil film will not be broken. As a result, a product with good oil adhesion and excellent quality without single yarn breakage or fluff can be obtained.

Next, to finish the yarn contact surface as described above, use, for example, 92
% Of Al ₂ O ₃ with a particle size of 1μ or less is fired and molded, then sand is removed with an emery cloth and barrel polishing is performed for around 24 hours with a barrel polisher that uses spherical abrasives as media. Obtained by

<Examples> Next, the effects of the present invention will be described more specifically with reference to Examples.

Example 1 A spinning temperature of a polyethylene terephthalate chip having an intrinsic viscosity of 0.62 measured at 25 ° C. in an orthochlorophenol solvent.
32 at 300 ℃, discharge rate 14.8g / min, spinning speed 3600m / min
When spinning a denier / 72 filament semi-undrawn yarn, a spinning pump with a concentration of 13% was lightened at a rate of 2.3 cc / min with a metering pump, and the yarn was fed with an oil agent applicator at a position 70 cm below the spinneret. In this case, the oil agent applying head used was a high-purity alumina ceramic having the shape shown in FIGS.

The results are shown in Table 1.

The measurement of PPT-P was carried out by a surface roughness measuring instrument "Surfcom 500" manufactured by Tokyo Seimitsu Co., Ltd.

Example 2 Using the same polyethylene terephthalate chip as in Example 1, spinning temperature 305 ° C., discharge rate 16.7 g / min, spinning speed 380
When spinning a semi-undrawn yarn of 35 denier / 72 filaments under the condition of 0 m / min, a spinning pump of a 14% concentration aqueous solution was weighed with a metering pump at a rate of 2.6 cc / min and applied at a position 90 cm below the spinneret. The yarn was lubricated by the device.

In this case, the oil agent applying head was continuously spun using a high purity alumina ceramic guide having a surface roughness RT2 to 6 of the shape shown in FIGS. The test results are shown in Table 2.

<Effects of the Invention> As described above, according to the present invention, a high-speed, fine-denier yarn, in particular, a single yarn denier at a take-up speed of 3500 m / min or more by spraying a cooling airflow from one direction to spin asymmetrically. When obtaining a yarn of 0.5 or less, it is possible to stably obtain a yarn of excellent quality for a long period of time without causing troubles such as single yarn breakage and yarn breakage without damaging the yarn.

[Brief description of drawings]

FIG. 1 is a front view showing a specific example of the present invention, FIGS. 2 and 3 are sectional views and a plan view taken along the line AA of FIG. 1, and FIG. 4 is a plan view showing another specific example. FIG. 5 is a melt spinning process chart according to the present invention, and FIG. 6 is a chart for explaining the effect of the present invention. 1 ... Head body, 2 ... Front passage, 3 ... Outlet hole

Claims (1)

[Claims] 1. An oil agent applying head for discharging a fixed amount of oil agent.
92% or more of Al ₂ O is used in the device that continuously applies the oil agent to the yarn by making the yarn contact travel at a spinning speed of 3500 m / min or more.
It consists of a molded body made by firing a ceramic containing _{3 and} having a particle diameter of 1 micron or less, and the yarn contact surface has a surface roughness of maximum height (RT) 2 to 6 microns by polishing spherical abrasive grains An oil agent applying head characterized by being processed so that the peak count (PPI-P) satisfies the following formula. PPI-P (pieces / inch)> 200-250C 0.8> C ≧ 0 C: Cutting level (micron)