JPS63270808A - Finishing oil imparting head - Google Patents

Abstract

PURPOSE:To obtain a finishing oil imparting head providing high-quality yarn without causing cutting of single yarn during high-seed spinning of thin denier yarn and end breakage, comprising ceramic containing a specific amount of Al2O3 wherein the yarn contact face of the head has specific surface roughness and a specific ridge peak count. CONSTITUTION:Yarn extruded from a spinneret 11 is cooled by a cooling zone 12, solidified and passed through a finishing oil imparting device 13 equipped with a main body 1 of a head which comprises ceramic 7 containing >=92% Al2O3, has a yarn contact face with surface roughness of 2-6mu maximum height (RT) and a ridge peak count (PPI-P) satisfying formula I [C is cutting level (mu)] and formula II a yarn traveling passageway 2 on the front and a finishing oil feed hole 6 connecting to a hollow finishing oil feed chamber 7 on a slant face 5 at the top part of a curved surface, as the oiling agent imparting head 1 so that the yarn Y can be smoothly provided with the finishing oil.

Description

[Detailed description of the invention] <Industrial technical field> The present invention relates to thermoplastic synthesis of polyamide, polyester, etc.
The present invention relates to an apparatus for quantitatively applying an oil agent to fibers, and particularly to an apparatus for applying an oil agent to melt-spun high-speed yarn.

<Prior Art> In recent years, with the progress of melt spinning technology, research has been actively conducted on making the spinneret more porous and increasing the take-up speed as a measure to reduce equipment productivity. Additionally, as the porosity of the spinneret increases, there is also a tendency for the denier to become finer.

On the other hand, methods for applying an oil agent in such melt spinning include (1) a method in which the thread is partially immersed in an oil agent and runs in contact with the surface of a rotating roller to apply an oil agent; α) a method for applying an oil agent There is a method in which a rod-shaped guide having at least one linear slit with a minute [1] is used to press the running yarn against the linear slit to cause the flowing oil to adhere thereto. When using method (1), when spinning using porous 11-karat gold, it is necessary to focus the yarn using a focusing guide between the spinneret and the oil application device, but
In particular, at a take-up speed of 3500 m2/fiber separation, single yarn fuzz tends to occur due to friction between the yarn and the guide, which is undesirable.

Furthermore, scattering of oil due to accompanying airflow is also cited as a problem.

In addition, in the case of method (i), there is not much of a problem if the single yarn is a normal denier, but if the single yarn is less than 1 denier, especially 0.5 denier, and the take-up speed is over 3500 m/min, oil spots will occur. There are problems such as easy thread breakage and frequent breakage of single threads. In this case, the welding surface is usually finished to a predetermined surface roughness, but in the conventional method, thread breakage tends to occur and the quality is uneven, making it unsatisfactory.

<Purpose of the Invention> The present invention solves these problems and provides a device that can stably apply an oil agent without damaging the yarn quality or causing troubles such as yarn breakage even during high-speed, fine-denier melt spinning. The purpose is to provide the following.

<Structure of the Invention> That is, the present invention provides a method for applying oil to the yarn continuously by bringing the yarn into contact with an oil applying head that discharges a certain amount of oil. and its grafting surface has a surface roughness of maximum height (RT) 2 to 6 microns and peak count (PP
This oil application head is characterized in that IP) is processed so that it satisfies the following formula.

In the present invention, U consisting of a convexly curved grafting surface is usually used.
Alternatively, a V-shaped guide groove is used, but the material must be a ceramic containing 92% or more of Adan 203; anything less than this will cause severe wear, making it difficult to stabilize long-term operation. Undesirable. Furthermore, the surface roughness of the head welding surface is 2 to 6 microns in maximum height (RT) and the number of peaks within a certain range is greater than the specified number, that is, the peak count (PPI-P) is 200 to 2500. (pieces/inch) or more. Note that C is the cutting level (reference level, in microns), which indicates the height from the center line of the roughness curve, and satisfies 0≦C<0.8.

The inventor of the present invention focused on the fact that the surface roughness of the welding surface of the oil agent application head is the most important item, and while conducting various tests, found that the maximum height (RT) is also the limit for surface roughness. Effective, but also more important, is the maximum height (
It was found that it is most effective if the number of peaks (peak count) within a certain range is regulated together with RT), leading to the present invention as described above.

Figure 6 shows single yarn denier of 0.5 or less (32 dt/72
fil, 35de/72NI), and these are the results of a number of tests with almost no fluff (
O mark) An example in which stable spinning cannot be performed due to excessive fuzz generation or yarn breakage (x, Δ mark) is shown. From this figure, Q,
The above equation shows the boundary line of the mark, and it shows that it is difficult to stably weave a high quality yarn in the range below the line. Note that the Δ mark indicates what has been conventionally used.

In this case, it is necessary that the surface roughness (RT) and the mountain beak count 1-number are simultaneously within the range specified by the present invention, and if either one is out of the range, the desired effect of the present invention will not be achieved. Difficult to wander around. If the surface roughness is less than 2 in RT, the abrasion resistance on the welding surface will increase and single filament fuzz will occur frequently, which is undesirable.If RT exceeds 6, the uniformity of the oil film formed by the spilled oil agent will be impaired. Therefore, at the same time as spots of oil adhesion, spots where the oil film is insufficient occur, and single yarn fuzz is likely to occur. Furthermore, PPI-P is 200 in mountain peak count number.
If it is less than -2500, even if the surface roughness is within the specified range, the uniform dispersion of the oil agent and its holding power will be lacking, and high-speed threads will cause oil film destruction and there will be a strong tendency for single filament fuzz to occur frequently.

Hereinafter, the present invention will be explained based on 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 A--A in FIG. 1.

In the figure, 1 is the head body, which is made of A12 of 92% or more.
It is made of ceramic containing 3. A thread running path (groove) 2 consisting of a curved surface in the shape of a letter or a convex shape is formed on the bottom surface (inner part) 4 of the guide surface 3. A lubricant outlet hole 6 is opened in the surface 5 and is connected to a hollow lubricant supply cavity 7 provided at the rear. Fig. 4 is a plan view showing another example (U-shaped guide surface). Figure 5 shows the oil application head in Figure 1 (=
It is a process explanatory diagram of melt spinning v4@ having a one-digit oil application device 13. In the figure, the yarn Y discharged from the spinneret 11 passes through a cooling zone 12, is cooled and solidified, and is then spun into a predetermined manner by the oil application device 13. He was given a lot of oil. Next, it passes through the auxiliary guide 14 and is focused (taken to the rego deck 1 at a predetermined speed by the rollers 15 and 16 and the winder 17
It is rolled up.

Here, in the present invention, as described above, the oil applying head is made of ceramic having 92% or more of A-cross zoa, and the welding surface thereof is regulated to a specific surface roughness and roughness.

For this reason, the interface surface becomes a surface consisting of densely packed fine peaks, which improves the dispersibility of the oil.

In addition to improving the oil film retention, the single yarn does not get stuck between the ridges and rides on the small ridges, eliminating the risk of the oil film breaking even when the yarn runs at high speed. Therefore, a product of excellent quality can be obtained in which the oil agent adheres well and there is no single thread breakage or fuzz in the yarn.

Next, in order to finish the welding surface as described above, for example, 9
After firing and molding using a raw material with a particle size of 1μ or less containing 2% or more Au203, sand was removed with an emery cloth and polished for 24 hours with a barrel polisher using spherical abrasive grains as the media.
Obtained by performing r#J1 barrel 01 polishing.

<Example> Next, the effects of the present invention will be explained in more detail with reference to Examples.

Example 1 Polyethylene terephthalate chips with an intrinsic viscosity of 0.62 measured at 25°C in an orthochlorophenol solvent were spun at a temperature of 300°C, a discharge rate of 114.8 g/min, and a spinning speed of 3.
When spinning semi-undrawn yarn of 32 denier/72 filaments at 600 m/min, the metering pump was used to
% of spinning oil was measured at a rate of 2.3 CC/min, and oil was applied to the yarn by an oil applying device at a position 701 below the spinneret. In this case, a high purity alumina ceramic having the shape shown in FIGS. 1 to 3 was used for the oil application head.

The results are shown in Table 1.

The PPT-P was measured using a surface roughness measuring instrument "Surfcom 500" manufactured by Tokyo Seimitsu Co., Ltd.

Example 2 Using the same polyethylene terephthalate chips as in Practical Example 1, a semi-undrawn yarn of 35 denier/72 filaments was spun at a spinning temperature of 305°C, a discharge rate of 16.7 g/min, and a spinning speed of 3800 m/min. At this time, a spinning oil having a concentration of 14% aqueous solution was measured at a rate of 2.6 cc/win using a metering pump, and the oil was supplied to the yarn using an oil applying device at a position of 90 CIR below the spinneret.

In this case, continuous spinning was carried out using a high-purity alumina ceramic guide having a surface roughness RT of 2 to 6 and having a shape shown in FIGS. 1 to 3 as an oil application head. The test results are shown in Table 2.

Table 2 <Effects of the Invention> As explained above, according to the present invention, high-speed, fine-denier yarn, especially asymmetric quench spinning by blowing a cooling air stream from one direction, can be obtained at a rate of 35,007/l/min or more. When obtaining yarn with a single yarn denier of 0.5 or less at a speed of 0.5 or less, it is possible to stably obtain high quality yarn for a long period of time without damaging the yarn or causing problems such as single yarn breakage or yarn breakage. becomes possible.

[Brief explanation of the drawing]

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 line A--A in FIG. 1. FIG. 4 is a plan view without showing other specific examples, FIG. 5 is a diagram of a melt-spun culm related to Mokukomei, and FIG. 6 is a diagram for explaining the present invention in detail. 1...Head body, 2...Omote path. 3... Outlet hole patent applicant Teijin Ltd. No. 1
Figure 2 Figure 1-2 Figure 5 Figure 6 PPI-P (Peak count) C (Cutting level) Procedural amendment August 37, 1988

Claims (1)

[Scope of Claims] A device that continuously applies an oil agent to a yarn by causing the yarn to run in contact with an oil agent application head that discharges a certain amount of oil agent, which is made of ceramic containing 92% or more of Al_2O_3 and whose contact An oil application head characterized in that the thread surface has a surface roughness of 2 to 6 microns in maximum height (RT) and is processed so that the peak-to-peak count (PPI-P) satisfies the following formula. PPI-P (pcs/inch)>200-250C0.8>
C≧0 C: Cutting level (micron)