JPH01260011A - Method for applying oiling agent - Google Patents

Abstract

PURPOSE:To prevent process trouble, such as yarn breakage or single fiber breakage, while holding uniform adhesion performance in the longitudinal direction of a yarn, by excessively feeding an oiling agent to a weighing and oil feeding guide and setting the return amount of the oiling agent from the weighing and oil feeding guide within a specific range. CONSTITUTION:An oiling agent in an weighed state is excessively discharged from a discharging hole 9 of an oil feeding guide 2. The amount (return amount) of the oiling agent, flowing down, dripped and returned from the lower end of the oil feeding guide 2 without being applied and accompanied by a yarn is 0.1-3.0% based on the supply rate of the oiling agent. Since the excessively fed oiling agent is made to flow down the whole groove width of a yarn contact part 3, a yarn contact part having a groove width (W) somewhat larger than a theoretical yarn width in the yarn contact part is preferably adopted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for applying an oil agent when spinning synthetic fibers at an ultra-high speed of a take-up speed of sooom/min or more.

[Prior Art] Typical methods for supplying lubricants to synthetic fibers made by melt-spinning thermoplastic polymers such as nylon and polyethylene terephthalate include a method using an oiling roller and a method using an oil supply guide. ing. Among these, the method using a lubrication guide, that is, the guide lubrication method, has a compact overall device, and when combined with upstairs lubrication, it is easy to suppress the increase in tension under high-speed spinning, and it is recommended to incorporate an oil metering and applying means such as a gear pump. This makes it easy to suppress variations in the adhesion of oil in the longitudinal direction of the yarn, making it one of the important spinning element technologies, especially in the ultra-high-speed spinning region with a take-up speed of 5000 m/min.

Various proposals have been made regarding the shape of the guide used in this guide lubrication method, especially the shape of the part where the yarn comes into contact (hereinafter referred to as the welding section). Because the width of the yarn is narrowed to some extent while oil is applied, the efficiency of applying the oil varies greatly depending on the spinning speed and type of yarn, which in turn greatly affects the occurrence of process problems such as yarn breakage, single yarn breakage, and shedding of white powder. It is something.

[Problems to be Solved by the Invention] In particular, regarding the length of the welding part, for example,
Publication No. 54013 states that there is an optimal range for the splicing part depending on the spinning speed, and if the splicing part is too short, the oil will flow down without adhering to the yarn; It is said that if the thread part is too long, fuzz will occur due to abrasion.

Indeed, as described in Japanese Patent Application Laid-Open No. 58-54013, by specifying the dimension of the welding part, the take-up speed can be increased to 5.
Even under harsh spinning conditions of over 1,000m/min,
It was possible to increase the efficiency of applying oil to a considerable number of varieties and reduce thread breakage.

However, even more diverse products can be picked up at a speed of 50oom.
When attempting to spin yarn at ultra-high speeds of /mtn or more, yarn breakage occurs frequently, particularly in varieties with a fine single yarn denier, and single yarn breakage occurs frequently, and yarn breakage occurs frequently in varieties with a thread content of 1.5% or more. However, it was not always possible to obtain a satisfactory operating condition due to the adhesion of white powder.

This is because the welding section required to truly apply the oil differs depending not only on the take-up speed but also on the number of single yarns, total denier, and amount of oil supplied. Especially thin single denier varieties and pieces! For varieties with a high 02 content, if the value is slightly below the appropriate value, a significant amount of oil will run down due to the phenomenon of excessive supply of oil, while if it exceeds the appropriate value, problems such as single thread breakage and shedding of white powder will occur.

The present invention has been made focusing on the above problems,
By proactively utilizing the excessive supply of lubricant, which was previously considered to be prohibited, and by regulating the amount of excess supply within a certain range, thread breakage and single parts can be prevented while maintaining uniform adhesion performance in the longitudinal direction of the thread. The purpose is to prevent process troubles such as thread breakage and white powder falling off.

[Means for Solving the Problems] In order to achieve this object, the present invention melt-spun thermoplastic synthetic fibers, applied a lubricant with a lubricating guide, and
When picking up at a pick-up speed of /min or more, an excess of lubricant is supplied to the measuring lubricant guide, and the amount of lubricant returned from the metering lubricant guide is 0.1 to 3.0% of the amount of lubricant supplied. I'll go.

The present invention will be explained in detail below.

FIG. 1 is a schematic diagram of a melt-spinning process showing an embodiment of the present invention, FIG. 2 is a front view showing an example of the oil supply guide used in the present invention, and FIG. 3 is a diagram showing the combination of the oil supply guide shown in FIG. FIG. 3 is a longitudinal sectional view of the refueling guide including the positional relationship.

In the figure, 1 is the base, 2 is the oil supply guide, 3 is the welding part,
4 is a focusing guide, 5.6 is a take-up roll, 7 is a winder, 8
9 is a gear pump, and 9 is an oil discharge hole.

After cooling, the yarn (Y) melt-spun from the spinneret 1 is applied with a lubricant at the welding section 3 of the oil supply guide 2, and after being converged by the converging guide 4, it is wound up by the winding machine 7 via the take-up roll 5.6. . After the oil is metered by the gear pump 8, it is discharged from the discharge hole 9 provided upstream of the welding section, flows down in the groove, and reaches the weft section 3.
reaches the upper end of

The oil comes into contact with the yarn at the upper end of the spliced portion 3, penetrates the gaps between the single yarns that form the grooves by capillary action, and is applied to the entire surface of the single yarn. The period from when the oil agent starts contacting the yarn until almost the entire amount of the oil agent is applied to the yarn varies depending on the take-up speed, the number of single yarns, the denier, and the amount of oil supplied. As mentioned above, the conventional way of thinking regarding the splicing section is to eliminate excessive supply of oil, and by making the splicing section slightly longer than the minimum required length for varieties that are most difficult to adhere to oil, it is possible to increase the number of spindles. The basic idea was to ensure that the entire amount of supplied lubricant was applied to the yarn even when attached to the yarn. In other words, the reality is that on the lower end side of the welding section 3, there is a portion where the lubricant runs out over a certain area. When traveling through this section where the oil is out, the yarn is generally lubricated on the upstream side, so
Even if the yarn runs on the splicing section 3, there should be no problem with scratching the yarn surface due to friction or single yarn breakage, but the yarn is not completely bundled on the splicing section. Substantially, each single yarn runs alone in contact with the welding part, and the lubricant is constantly and uniformly applied to each single yarn of the dozens to dozens of yarns. Therefore, even though the lubricant is applied, if the lubricant runs out on the lower end side of the welding section 3, it will have a large effect on the passage of the process guide after the lubricating guide.

The present invention is intended to supply a certain amount of lubricant even to the section of the welding section 3 where the lubricant is exhausted.

That is, by oversupplying a specific amount of oil, it is possible to eliminate thread breakage and single thread breakage in products with a thin single yarn denier, and white powder shedding in products with a high TiO2 content.

What is required here is that the amount of oil returned is 0.1 to 3.0% of the amount of oil supplied.

That is, in the present invention, a specific amount of lubricant is oversupplied, but as a guideline for the oversupply amount, as will be described in detail later, it is necessary to apply the lubricant to the yarn from the lower end of the lubricant guide 2 without being attached to the yarn. The oil that has flowed down or dripped back is collected, and the collected amount is expressed as the returned amount. If the amount of return is less than 0.1%, the lubricant will partially run out, and yarn breakage, single yarn breakage, and shedding of white powder, which are the objects of the present invention, cannot be avoided. On the other hand, if the return amount exceeds 3.0%, the original purpose of guide oiling, which is uniform application of lubricant in the longitudinal direction, cannot be achieved, and in extreme cases, poor convergence may result in single yarn breakage (
fluff). It is preferable that the appropriate range of this return amount be set to a longer return amount as the take-up speed increases.

In other words, when the take-up speed is sooom/mtn, the return amount is about 0.1%, which is no problem, but when the take-up speed is 6000 m/mtn, there is no problem.
By setting the return amount to 0.3% or more at min, it is more effective against yarn breakage, etc. In addition, the appropriate range of the return amount also changes depending on the single yarn denier, and when spinning a variety with a single yarn denier of 2d or more at a take-up speed of 6000 m/min, a return amount of 0.3% or more is preferable; Min single yarn denier is 165d
When spinning the following types, the return amount is preferably 1.0% or more.

However, in either case, the upper limit of the amount of return is 3.0%.

Note that it is necessary for the excessively supplied lubricant to flow down over the entire width of the groove in the welding section, and if it flows down to one side of the groove, the lubricant will partially run out, which is undesirable.

As a specific method for applying the oil agent appropriately, for example, a groove width (W
) is applied as a welding part to prevent the threads from converging excessively on the welding part, or by increasing the curvature (r) of the joining part of the convergence guide 4 below the refueling guide 2, and The method is to increase the distance (Ω) between the lubrication guide and the focusing guide 4 to ensure an appropriate yarn spacing on the yarn welding part, or to increase the amount of lubricant a little longer so that the distance (Ω) between the lubrication guide and the yarn (Y) is longer. A method such as reducing the output I(L) can be adopted.

Further, from the viewpoint of ensuring an appropriate yarn spacing on the splicing portion and avoiding excessive bunching, it is preferable that the shape of the groove bottom of the splicing portion 3 is substantially flat. Furthermore, for the purpose of uniformly flowing down the lubricant over the entire groove width, it is preferable that the width of the discharge hole in the groove width direction be equal to or larger than the groove width (W) of the welding portion 3.

[Example] The present invention will be explained in more detail below using Examples.

In the present invention, the amount and rate of return of the oil agent and the unevenness of application of the oil agent are measured by the following method.

<1) Oil agent returning amount led by oil agent returner> The oil agent dripping from the lower end of the oil supply guide 2 without being applied to the yarn was collected in an oil pan, and the amount collected per unit time was defined as the amount returned.

Reversion rate〉 (2) Oil application unevenness Super insulation resistance tester RH-2I manufactured by Yokogawa Hulett Packard Co., Ltd.
Using C, a terminal is inserted into the traveling yarn being wound, and the change in the resistance value of the yarn is read as an output voltage value. Since the oil/moisture voltage value applied to the yarn changes proportionally, this measurement method allows the oil application level and application unevenness to be read.

Example 1 Polyethylene terephthalate (Ti02 content 0.03
%> was melted at a spinning temperature of 295°C, discharged from a spinneret with 36 holes, cooled in the usual manner, and then taken at a take-up speed of 600°C.
The yarn was taken up at a speed of 0 m/min, and a yarn of 50 d-36 f was wound up. At this time, the polymer discharge port was 32.5 g/min, the groove bottom of the welded portion was flat, and the welded portion was 2.5 g/min. A lubrication guide was placed at a position 184 m below the nozzle, and the state of convergence of the threads on the lubrication guide was changed as shown in Table 1, and the lubricant was applied at various return rates. Silk reeling performance at each return rate, fuzz generation status,
The results of oily spots are shown in Table 1. Note that the concentration of all oil agents was 15%.

As is clear from Table 1, in Nα2.3.5.6 and 8, in which the return rate of the oil agent was within the range of the present invention, the yarn reeling properties were good, and no fuzz was generated on the end surface of the wound drum.

On the other hand, NQI where the return rate of the oil agent is lower than the range of the present invention,
In case 7, there is a section where the lubricant runs out at the bottom of the groove welding part.
There are many yarn breakages, and there is also fuzz on the end of the drum. In addition, the return rate of the oil agent is Nα4.9 which is higher than the range of the present invention.
In No. 9, there were large spots of oil adhesion, and in particular, in No. 9, fuzz was generated on the end face of the drum due to the spots of oil adhesion.

Example 2 Example 1N0.6 except that polyethylene terephthalate with a TiO2 content of 2.5% was used as a raw material, a spinneret with 18 holes was used, and the oiling guide advance distance was variously changed.
Melt spinning was carried out under the same conditions as above, and a yarn of 50d-18f was wound up.

At this time, oil was applied on the oil supply guide at various return rates as shown in Table 2. Table 2 shows the state of white powder accumulated on the guide at the spout 6 hours after spinning at each return rate and the results of oil adhesion spots.

Note that the concentration of all oil agents was 15%.

Note that Nα10.13.14 is a comparative example for clarifying the effects of the present invention.

As is clear from Table 2, for Nα11.12 and 15, which have oil return rates within the range of the present invention, no white powder was generated on the oil supply guide, and the variation in oil adhesion was small. on the other hand,
When the return rate of the oil agent is Nα10.14, which is lower than the range of the present invention, the oil agent runs out at the lower part of the thread welding part of the oil supply guide, and white powder is generated in that section due to friction between the running yarn and the guide.

On the other hand, for Nα13, the return rate of the oil agent is higher than the range of the present invention, and no white powder is generated on the guide, but the adhesion spots of the oil agent are large.

[Effects of the Invention] As described above, the present invention solves the phenomenon of lubricant return, which has been considered to be prohibited in the conventional guide lubricating method using a lubricating guide, by keeping it within a certain appropriate range. On the contrary, it is possible to prevent yarn breakage, single yarn breakage, white powder shedding, etc. Especially during ultra-high speed spinning, yarn breakage and single yarn breakage are reduced, stable operation is possible, and the oil supply guide can be replaced frequently. Therefore, troubles such as generation of fuzz and shedding of white powder during passing through higher-order processes can be prevented, and a yarn with extremely good passability through higher-order processes can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a melt-spinning process showing an embodiment of the present invention, FIG. 2 is a front view showing an example of the oil supply guide used in the present invention, and FIG. 3 is a diagram showing the combination of the oil supply guide shown in FIG. FIG. 3 is a longitudinal sectional view of the refueling guide including the positional relationship. 1: Mouthpiece 2: Oil supply guide 3: Welding section 4: Focusing guide 5.6: Take-up roll 7: Winder 8: Gear pump 9: Oil discharge hole Patent applicant Toshi Co., Ltd.

Claims (1)

[Claims] When thermoplastic synthetic fibers are melt-spun, a lubricant is applied with a metering lubrication guide, and the oil is taken up at a take-up speed of 5000 m/min or more, an excessive amount of lubricant is supplied to the metering lubrication guide, and the amount of oil returned from the metering lubrication guide is 0.0 for the amount of oil supplied.
A method for applying an oil agent, characterized in that the amount is 1 to 3.0%.