JPH01183512A - Oiling of synthetic fiber - Google Patents

Abstract

PURPOSE:To inhibit the generation of fluffs, cut fibers, etc., by forming the cross-sectional shape of the guide surface of an oiling guide imparting an oil to fibers into a specific shape to relax the local abrasion of the fibers with the guide surface. CONSTITUTION:The cross-sectional shape of the guide surface of an oiling guide 10 is formed into a mountain shape facing to a perpendicular drawn down from a spinneret. A curvature-processing radius r (mm) at the upper fiber contact-starting point of a fiber-contacting portion 11a is set to a value satisfying an equation of r>0.012/(1-sinalpha/2) [alpha is an angle (degree) formed from the fiber-contacting portion 11a and an oil-discharging portion 11b]. Fibers 2 are taken down in the downward direction of the oiling guide 10 so that an angle theta1 formed from the fiber-contacting portion and the perpendicular and an angle theta2 formed from the perpendicular and the fibers taken down downwardly from the lower fiber contact-finishing point satisfy an equation of 0<=theta1<theta2.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for applying an oil agent to synthetic fibers, and in particular, a method for applying an oil agent to synthetic fibers that are spun at a spinning speed of 4000 m/-in or more using an oil supply guide. Regarding how to.

(Prior Art) A spinning yarn of a thermoplastic polymer such as nylon is bundled by an oil supply guide below a spinneret, and an oil agent is applied thereto. At this time, by uniformly applying the lubricant in the longitudinal and lateral directions of the yarn, occurrence of fuzz and yarn breakage when the yarn comes into contact with the oil supply guide is prevented.

As a method for uniformly applying an oil agent to a yarn, for example, a method disclosed in Japanese Patent Publication No. 70111/1983 is known. This method regulates the angle θ between the perpendicular line drawn from the spinneret and the single yarn path flowing down through the oil supply guide,
The higher the yarn speed and the lower the single yarn denier, the larger the angle θ is set, thereby preventing yarn breakage, fuzzing, etc.

(Problem to be Solved by the Invention) However, in high-speed yarn spinning where the spinning speed exceeds 400 threads/+*in, the above-mentioned conventional lubricant application method using a lubricant guide increases the abrasion resistance on the lubricant guide. There is a problem in that localized abrasion occurs due to subtle variations in shape at the thread contact area, resulting in frequent fuzzing, thread breakage, etc.

This problem becomes more pronounced as the above-mentioned angle θ becomes larger.

The present invention was made to solve such problems,
At the yarn splicing section of the oil supply guide, this method alleviates local abrasion between the yarn and the guide surface between the upper contact start point and the lower contact end point of the yarn at this yarn splice section, thereby preventing the occurrence of fuzz, yarn breakage, etc. It is an object of the present invention to provide a method for applying an oil agent to synthetic fibers in a manner that suppresses the amount of oil applied to synthetic fibers.

(Means for Solving the Problems) In order to achieve the above-mentioned object, according to the present invention, in an oil application method in which a yarn spun from a spinneret is guided to an oil supply guide and an oil is applied thereto, the oil supply guide The cross-sectional shape of the guide surface faces the perpendicular line from the spinneret, and includes a spliced part where the yarn contacts and extends in a straight line, and an oil agent located above the spliced part and inclined with respect to the perpendicular line. A lubricant discharge part having a discharge hole, and a lubricant return groove located below the spliced part and inclined with respect to the perpendicular line for allowing excess lubricant to flow down, are formed in a chevron shape, and are formed in an upper part of the spliced part. The curved surface machining radius r (ml+) at the starting point of yarn contact is set to a value that satisfies the following formula: While smoothly connecting the splicing part and the oil discharge part and discharging the oil at a predetermined flow rate from the oil discharge hole, the angle θI (@) between the splice part and the perpendicular line, and the lower yarn The method of lubricating synthetic fibers is characterized in that the thread is drawn below the oil supply guide so that the angle θ2C between the thread drawn downward from the contact end point and the perpendicular line satisfies the following formula: % formula % A method is provided.

(Function) If the upper yarn contact start point where the yarns come in contact at high speed is curved with the radius r specified by the method of the present invention, crystal cracking and falling off of the member crystals on the guide surface due to local abrasion can be prevented, and fuzzing, yarn breakage, etc. can be prevented. It will be planned. In addition, the angle θ1 between the splicing portion and the perpendicular line drawn from the spinneret, and the angle θ2 between the perpendicular line and the yarn drawn downward from the lower yarn contact end point are set to values within the range specified by the method of the present invention. When the yarn is pulled under the oil supply guide, crystal cracking and falling off of the crystals on the guide surface due to local abrasion are prevented, and the yarn is prevented from waving at the welding section and separating the yarn from the guide surface at the weaping section. The threads stably contact the spliced portion without causing any damage, and uniform application of the lubricant is achieved.

Hereinafter, the method for applying an oil agent to synthetic fibers according to the present invention will be explained in detail based on the drawings.

1 to 4 show a lubricant application device to which the synthetic fiber lubricant application method according to the present invention is applied. It is composed of a refueling boat 20 that supplies oil to the thread presser guide 30 and a thread presser guide 30.

The refueling guide main body 10 is manufactured by sintering alumina, for example, and has a negative side back surface 10a supported and fixed to a support (not shown) or the like. A vertical groove 11 that opens to the other side surface 10b is cut out with a predetermined width at a substantially central position in the thickness direction, extending over the entire vertical direction, and is cut out with a predetermined width from a spinneret (not shown) along the bottom of the vertical groove 11. A guide surface is formed that guides the spun yarn 2 and causes the oil to adhere to the yarn 2. This guide surface has a chevron-shaped cross section toward the perpendicular line VL drawn from the spinneret.
a lubricant discharge part 11b that is located above the welding part 11a and slopes toward the - side back surface 10a from the connection part with the weft part 11a; and an oil return groove 11c that slopes from the bottom toward the minus side back surface 10a.

The connecting portion between the welding portion 11a of the guide surface and the oil discharge portion 11b is curved to have a radius r (as) that satisfies the following equation (1) (see FIG. 4).

r >0.012 / (1-5inα/2) ・
(1) Here, α is the angle (@) formed by the guide surface of the welding section 11a and the guide surface of the oil discharge section 11b.

In addition, the welding part 11a and the oil return groove part 11c on the guide surface
The connecting part with the radius r'(vs
) is preferably curved (see Figure 4).

r'>0.012/(1-5ina'12)
...(1) 'Here, α'' is the angle (
0).

Also, the upper limits of r and r' are not particularly limited, but r <
It is preferable that 1/(cos α/2) r'<1/(coscr'/2).

The guide surface of the welding portion 11a is aligned with the perpendicular line VL drawn from the cap.
It is inclined at an angle θ, (°) of about 1 which satisfies the following equation (2).

0≦゛θ, <θ2... (2) Here, θ2 is the angle at which the yarn 2 is held by the yarn presser guide 30, which will be described later, and the yarn 2 separates from the welded portion 11a on the guide surface. The angle between the straight line connecting the thread contact end point 6 and the contact point of the thread 2 of the thread presser guide 30 and the perpendicular line VL drawn from the mouthpiece is equal to the angle. The thread presser guide 30 is supported and fixed to a support or the like at a predetermined position below the oil supply guide main body 10. If the above-mentioned angle θ1 is larger than the angle θ, the welding part 11
The angle θ1 needs to be set to a smaller value than the angle θ2 because the stability of the thread 2 running in close contact at point a is poor and the oil is applied unevenly.

The yarn 2 spun from the spindle is attached to the welding portion 11 on the guide surface.
The distance 11 between the point (yarn contact start point) 4 at which contact is started at a and the yarn contact end point 6 is preferably 1 to 20 cm in order to uniformly adhere the oil to the yarn 2; More preferably, it is set to 1.5 to 71. Furthermore, if the distance 12 between the thread contact end point 6 on the guide surface and the contact point of the thread 2 on the thread presser guide 30 is short, the error in the thread presser angle θ2 due to the setting error of the thread presser guide 30 will be large ( On the other hand, if the length is too long, the thread path at the welding part 11a will become unstable.
It is set to a suitable value in the range of 0 mm. Furthermore, the welding part 11
The angle α or α° formed between the guide surface of a and the guide surface of the oil discharge part 11b, or the guide surface of the welding part 11a and the guide surface of the oil return groove 11c, allows the oil to flow smoothly down these guide surfaces. Therefore, it is preferable to set the holding angle θ of the yarn 2 by the thread holding guide 30 to 0.5 to 175° for the reasons of stability of oil adhesion and thread abrasion on the guide surface. It is preferable to set the value within the range of 10@.

The distance between the spinneret (not shown) and the yarn contact starting point 4 of the yarn welding section 11a described above is 1 to 3 m in order to sufficiently cool and lubricate the yarn and reduce internal distortion of the yarn. It is preferable.

The refueling boat 20 is located on one side of the rear surface 1 of the refueling guide main body 10.
It is fixed to the rear surface 10a at a substantially central position so as to protrude perpendicularly to the rear surface 10a, and is connected via a pipe 21 to an oil supply device such as a gear pump (not shown). An oil supply hole 10 is formed in the guide surface of the oil discharge part 11b at a position above the yarn contact starting point 4 of the welding part 11a and substantially perpendicular to the guide surface, and the oil supply hole 10c is It communicates with the oil supply port 20, and a predetermined amount of oil supplied from the oil supply device is discharged onto the guide surface of the oil discharge portion 11b through the oil supply hole 10c. Oil discharge part 1
The lubricant discharged onto the guide surface of 1b adheres to the yarn 2 at the welding part 11a, and the excess lubricant flows into the lubricant return groove part 11.
The oil flows down the guide surface of c, is collected in a return pipe, and is returned to an oil storage tank (none of which is shown).

In the synthetic fiber lubricating device l configured as shown in 2, the spinning speed (take-up speed) from the spinneret is 4000 to 60.
The nylon yarn 2 spun at a high speed of 00 w/sin contacts the guide surface at the yarn contact starting point 4 of the curved welding section 11a as described above, and contacts the guide surface of the weaping section 11a. While doing so, he was taken away.

At this time, the oil flowing down along the guide surface is evenly applied to the yarn 2, and the oil is uniformly attached to the yarn 2. Then, the yarn contact end point 6 of the spliced portion 11a
The yarn 2 that has left is collected in a yarn presser guide 30 and wound up by a winding device (not shown).

Since the guide surface at the yarn contact starting point 4 is curved with a radius r that satisfies the condition given by the above formula (1), local abrasion when the yarn 2 first contacts the guide surface is alleviated. be done. In addition, the yarn 2 is held down by the thread presser guide 30 at a presser angle θ which is larger than the angle θ1 that the splicing portion 11a makes with the perpendicular line VL below the mouthpiece, so that the yarn 2 is held securely. It flows down along the guide surface and does not separate from the guide surface, and by regulating θ to 0° or more, local abrasion at the lower part of the spliced portion is alleviated. Further, since the yarn contact end point 6 is also curved so that the yarn welding portion 11a and the oil return groove portion 11c are connected smoothly as shown in the figure, local abrasion caused at the yarn contact end point 6 is alleviated. be able to.

The method of the present invention can be applied not only to nylon but also to any synthetic fibers.

The forked group oil supply guide main body 10 has the following characteristics: (1) the angle α between the guide surface of the weft section 11a and the guide surface of the oil discharge section 11b is 165°; The angle α1 formed by
, and the welding part 1 of the refueling guide surface when attached to the pulling machine
A plurality of pieces having different angles θ of 1a were prepared.

This oil supply guide main body IO was attached to a take-up machine, and the holding angle θ2 by the thread presser guide 30 was set to 10, and a test was conducted in which oil was applied to a nylon thread at a take-up speed of 4000 m/win.

FIG. 5 shows the results of this test, where the 0 mark indicates that the number of thread breakages per day is less than 1, and the X mark indicates that the number of thread breaks per day is 2 or more times.

From FIG. 5, the range of the present invention, i.e., r >0.012 / (1-5 incr/2) −1
, 4(+*m)0′″≦θ1<11 It can be seen that the guide body is good.

(Effects of the Invention) As described in detail above, according to the method of applying an oil agent to synthetic fibers of the present invention, the cross-sectional shape of the guide surface of the oil supply guide is formed into a chevron shape facing the perpendicular line from the spinneret, and The curved surface processing radius r at the upper yarn contact start point of the thread part is set to a value that satisfies a predetermined formula to smoothly connect the splicing part and the oil discharge part, and the angle θ3 formed between the splicing part and the perpendicular line is , and the angle θ8 of the yarn taken downward from the lower yarn contact end point with the perpendicular line satisfies a predetermined conditional expression. It is possible to alleviate local friction between the yarn and the guide surface at the upper contact starting point, prevent crystal cracking and falling off of the guide surface, suppress the occurrence of fuzz and yarn breakage, and prevent contact. The advantage is that the yarn can stably contact the spliced portion without waviness in the yarn portion or separation of the yarn from the spliced portion guide surface, and the lubricant can be uniformly applied to the yarn. It has a great effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an oil applying device to which the method of applying an oil agent to synthetic fibers according to the present invention is applied, and FIG. 2 is a top view of the same device.
Fig. 3 is a front view of the device, Fig. 4 is an enlarged sectional view of the main part to explain the shape of the guide surface of the device, and Fig. 5 is the curved surface machining radius r at the starting point of upper yarn contact of the oil supply guide body. , and the angle θ1 of the welding part of the refueling guide surface when attached to the pulling machine.
The results of thread breakage tests conducted with various changes in
This is a graph showing a case where the number of times is 2 or more. DESCRIPTION OF SYMBOLS 1... Oil agent applying device, 2... Yarn, 4... Upper yarn contact start point, 6... Lower yarn contact end point, 10...
・Lubrication guide body, 10c...Oil agent discharge hole, 11...
- Vertical groove, 11a... Thread welding part, llb... Oil discharge part, llc... Oil return groove part, 30... Yarn presser guide. Applicant Toshi Co., Ltd. Company Representative Patent Attorney Kanji Nagado Figure 1

Claims (1)

[Scope of Claims] In an oil application method in which yarn spun from a spinneret is guided to an oil supply guide and an oil is applied thereto, the cross-sectional shape of the guide surface of the oil supply guide is directed toward a perpendicular line from the spinneret, a welding section with which the yarns are in contact and extend linearly; an oil discharge section located above the weaping section and inclined with respect to the perpendicular line and having an oil discharge hole; and a lubricant discharge section located below the junction. It is formed into a chevron shape including an oil return groove that is inclined with respect to the perpendicular line and allows excess oil to flow down, and the curved surface processing radius r (mm) at the upper yarn contact start point of the welding part is expressed by the following formula: r> 0.012/(1-sin α/2) (where α is the angle (°) formed by the splicing part and the oil discharge part). While smoothly connecting the lubricant and discharging the lubricant at a predetermined flow rate from the lubricant discharge hole, the angle θ_1 (°) between the spliced yarn portion and the perpendicular line, and the yarn being pulled downward from the lower yarn contact end point. Angle θ_2(
A method for applying an oil agent to synthetic fibers, characterized in that the yarn is taken under the oil supply guide so that the angle (°) satisfies the following formula: 0≦θ_1<θ_2.