JPS599230A - Stretching and false twisting process - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention relates to a method for efficiently producing drawn and false twisted yarn. A further object of the present invention is to provide a method for preventing yarn breakage and fuzz caused by heater tar deposited on a heat treatment heater during high-speed false twisting. In recent years, thermoplastic synthetic keyaki (devices that impart bulkiness) such as polynisdel have rapidly increased in speed, and in particular, circumscribed friction false-twisting methods or belt friction false-twisting methods have been increasing in speed from 7001+t/min. It has become common to carry out acceleration at a speed of 900 +n 7 minutes. In such high-speed JII rubbing false twisting, the amount of time required to set the yarn is proportional to the increase in the processing speed. Since the centrifugal force increases by π, the oil on the f-loaded fibers given f = 1 in one spinning culm scatters onto the heat treatment heater, and the oil that scatters on the heater is oxidized and decomposed by the heat. Heater tar is formed. This heater tar directly causes thread breakage and fluff, so the machine must be stopped frequently to clean the heater, which is a worrisome problem in terms of production efficiency. In particular, when the supplied raw yarn is processed 771] continuously using a transfer knot, this heater tar causes a serious problem and greatly hinders the improvement of productivity. In order to solve this problem, an oil composition with excellent heat resistance has been sought, and various studies have been conducted so far.For example, Japanese Patent Application Laid-open No. 4F!
-981,94 Publication, JP-A-48-64294@
, JP-A-49-62724, JP-A-48-227
Publication No. 93 9% opening! Publication M-38524. This method uses a copolymer composition of ethylene. Polyether is an ideal material, as it is difficult to decompose and volatilize when the yarn is heated for a short period of time, such as when the yarn runs through a heater, but on the other hand, when it is scattered onto the heater grate and heated for a long time, most of it decomposes. It has thermal properties and is a much better composition than conventional synthetic ester compositions. However, on the flat table where stretch pressing is carried out at high speed, some of the lubricant that has been cut off from one fiber is completely decomposed.
r〒11C1 undergoes 1y9 polymerization and solidifies to form a heater scum. In addition, it is highly effective against scraping of polymers, oligomers, etc.

[2. As the pltj progresses, solidified scum accumulates on the heater, which tends to cause fluff of the yarn and breakage of the yarn when passing through the transfer knot. In particular, the temporary fabric processing speed is 700 m 7 minutes in the history of high-speed processing, and this Lη direction is 11 (currently, the polyether composition has a decomposition residue of about 0.4 to 0.6% in the oil thermal decomposition test). Even in the case of yarn treated with a wafer, the effect of heater scum accumulation appears after about 5 days of continuous processing, and the passage through the transfer knot becomes extremely low. One method is to reduce the amount of oil adhering to the fibers and suppressing the oil from being shaken off from the fibers, reducing the amount of oil adhering to 0.2% to 0.3% of the undrawn yarn used for high-speed false twisting. (For fibers 711) However, even if this method is combined, it is difficult to eliminate heater scum (:N L). To solve problems caused by heater scum during processing, satisfactory results can be expected with a thorough proposal in terms of oil composition [1]. The present invention was achieved as a result of intensive studies to solve the problems caused by the accumulation of heater scum and to obtain a high degree of processing and productivity. To remove scum by instantaneously removing the yarn running on the heat treatment heater from the heat protection heater during dotting when performing stretching false twisting using a heat treatment heater and a false twisting device provided between the roll and the stretching roll. This is a drawing/false twisting method characterized by the following: The method of the present invention involves instantaneously removing the yarn running in contact with the heat treatment heater from the heater during high-speed drawing (without stopping the remaining material). This method prevents the growth of scum by peeling off the accumulated heater scum layer from the heater.The method of the present invention will be explained in detail.Heater scum during high-speed false twisting is caused by high-speed rotation of the yarn and The thermal decomposition residue of the oil that was separated from the f# navy kasuri due to the high-temperature IL treatment was gradually deposited on the side of the running yarn on the side of the heat treatment plate. It grows and covers the yarn, and the yarn turns around the narrow area of the heater scum on the surface of the heat treatment heater in a shape of 27 lines. The yarn partially stretches as it runs through the tunnel of the heater scum, and the 1ψ friction resistance with the scum wall increases, causing yarn breakage. Because of the yarn knotting, the thickness of the yarn is twice as thick as the non-knotted portion, so it collides with the scum wall at the tunnel entrance of the scum, causing a large change in tension and causing all yarns to break. Raise the thread. The present invention allows the telescopic guide to be installed at a point in time when the heater scum accumulation has not grown significantly.
L-t, Hill fti [Ll (l'llj ('
) ik? By removing the -1 yarn f ['' from the heater, the heater scum pore formed on the heater 1 surface is destroyed. By performing this operation intermittently with VC, scum tunnel formation is suppressed and the heater The cleaning cycle can be significantly extended.The processed yarn in the part that has come off the heat treatment plate will become crimped and dyed abnormally, making it impossible to use it under normal light.Therefore, this operation l, l) of continuously produced processed yarn packages ('t-fish SA
You need to do it while you are in Ha. The thread removal distance from the heat treatment heater surface using the telescopic guide is approximately 60 to 80 cm from the exit of the running thread, and is sufficiently effective only in areas where scum is likely to occur.
The heater scum is destroyed and peeled off by moving the prescopic guide back and forth twice and removing it from the base metal heater, thereby preventing the formation of tunnel-shaped scum. In addition, operate the telescopic guide to open the thread from the 1:1 part of the heat treatment heater outlet.・No. 5, the tension will increase and yarn breakage will occur easily. Therefore, the telescopic guide operation is
2 seconds 1': 1 gun L+7. I hope it will be summer in time. Method of the present invention + CI! □Supplying undrawn yarn 3" 1! As an oil agent, it has been used conventionally. There is no harm in using leivre-based oils while the child is lying down.It is more desirable to use r, 1.
When in is used in combination, the 1-1 tarscum becomes softer and the effect is more pronounced. Method d of the present invention: Combination of polyester and polyamide Aoi F! i,
It is most suitable for high-speed stretching and false twisting of fibers, especially partially oriented polyester yarns at 700 pn for 1 minute or more. It has a remarkable effect on processing. The so-called temporary pressing process is performed immediately after folding, sequential or simultaneous stretching, and spinning without winding.
A surface processing method may be used, and the material is not limited to bamboo depending on the processing method. 9 j 2) I will say something about Misaki in the example of Dingji Aya. Example 1 115 tenier/spun at a spinning speed of 3500 m/min
A polyethylene terephthanate undrawn multifilament yarn of 736 filaments was spun, and 0.35 inches of an oil emulsion of the composition shown below was added to form a package with 101<9 windings. Next, the undrawn yarn was supplied to a simultaneous tension-stretching machine equipped with a circumferential frictional false-twisting device, where it was simultaneously stretched and false-twisted. using a processing speed of 700 m/min, a stretching ratio of x, 5
Processing was carried out at a temperature of 220°C and a temperature of 220°C. At this time, the telescopic guide was moved twice each time the processing amount reached 20 Kf/weight, and the yarn was removed from the heater grate twice to remove the scum. The transfer properties at this time are shown in Table 1. On the other hand, for comparison, Table 1 also shows the machining results of the conventional method in which the press-copy guide is not operated. The total amount processed in each experiment was 5.5 tons. Oil composition polyether (molecule Jll 4000. Po/Eo
75/25) 99% alkyl sulfonate Na salt OI 5% alkyl phosphate to salt 0.5% 1st As shown in the table above, when operating the telescopic guide, the 1# product of the heater scum is small and the trough/sphere - no Tsuji! A remarkable effect was observed for the 1η property, and it can be seen that the present invention is even more effective. It should be noted that, due to the transfer passing rate, the part where the rear end of the undrawn filament yarn to be processed first and the tip of the undrawn multifilament yarn to be processed next will break when passing through the false twisting device. It is expressed as a percentage of the number of people who passed the test without doing anything. In addition, the state of scum accumulation was judged based on the following criteria. ◎: Hardly any adhesion or accumulation of heater stent was observed. ○: Extremely small amount of scum L product Δ: Very large amount of scum deposited × A lot of Niscum deposits forming tunnel formations × × Excessive amount of Niscum and long tunnel formation Example 2 Spinning speed 3soom/ A polyethylene terephthalate undrawn multifilament yarn of 115 denier/36 filaments was spun at 7 minutes, and 0.30% of the same oil as in Example 1 was added to the yarn and wound as a lo K9 yarn. I took it. Next, the #Song drawn yarn was passed through a belt friction plate processing device (tiM
It is supplied to the temporary drawing machine for four hours, and the same as the drawing process.
Processing was carried out. The temporary machine is Gyoda Matsuha Crimper 333
Using f, the sail extension magnification is 1°52x. Acceleration speed 900m/min with m1 hitter + M IJj 220'C. The speed was set at 7 oom/min (about 600 tons) 1/min. IG, (Each time the processing amount per unit reaches 20 kg (-2 yarn), operate the telescopic guide during dotting to remove the yarn by a length of 50 nn from the exit side of the heat treatment plate, and then Immediately, the rC source VC was returned to 7he (repeated twice). The transfer passing rate at this time is shown in 2'f?. The number of katakana was 1 ton for each level. As shown in the upper table of Table 2. It can be seen that the method of preventing heater scum accumulation and tunnel formation by operating a telescopic guide has a more significant effect in high-speed machining, and that the method of the present invention is an effective method in total. Pass rate during the e-support test period ((6
The transfer pass rate is the same as in Example 1, where the part connecting the rear end of the undrawn filament yarn processed first and the tip of the undrawn filament yarn processed next is false twisted. It shows the percentage of threads that passed through the processing equipment without breaking. Furthermore, the state of heater scum deposition was also evaluated using the same criteria as in Example 1.

Claims (3)

[Claims] (1) When drawing and false-twisting synthetic fiber undrawn yarn using a heat treatment heater and a false twisting device installed between a supply roll and a drawing roll, the yarn running on the heat treatment heater at the time of dotting is instantly 1. A method for stretch pre-combustion processing, which comprises removing the cam by removing it from the heat treatment heater. (2) The method according to claim 1, wherein the stretching false twisting speed is 700 m/min or more. (3) The method according to claim 1 or 2, wherein the synthetic fiber yarn to be supplied is a partially oriented polyester yarn.