KR810001418B1 - Making method of polyester bulky yarn - Google Patents

Abstract

A process for producing a polyester textured yarn which comprises darwing and simultaneously false-twisting an undraun polyester yarn using a draw-texturing apparatus equipped with a heat-treating heater and a false twister between feed rollers and draw rollers, wherein the undrawn polyester yarn has a birefringence(n) of 0.01-0.05, and the draw ratio(DR) is adjusted to a value expressed by the following equations according to the birefringence of the undrawn polyester yarn.

Description

Manufacturing method of polyester sublime yarn

1 is a graph showing the relationship between aging time and dyeing difference at each aging temperature.

2 is a graph showing a range of aging temperature and time of the present invention.

The present invention relates to a method for producing a polyester sublime yarn having good leveling.

It is conventionally known to manufacture polyester sublime yarn with little residual torque from undrawn yarn in one step by stretching and stretching the undrawn yarn of polyester (especially polyethylene terephthalate) in one step. .

However, there is a drawback that the polyester sublime yarn obtained by such stretching false twist has more dyeing spots than the polyester sublime yarn obtained by combusting the stretched yarn.

MEANS TO SOLVE THE PROBLEM As a result of repeating research about the cause of the dyeing yarn of polyester sublime yarn obtained by extending | stretching twisting, the present inventors responded by the difference in the leaving time of the unstretched yarn between the spinning and the extending | stretching twisting. This emergence was followed. Therefore, it is considered that if the undrawn yarn's leaving time is completely the same, there is almost no dyeing spot. However, when the polyester sublime yarn is industrially produced, it is impossible to make the undrawn yarn completely the same.

For example, in the case of a board for the same undrawn yarn package, for example, when 7.5 kg wound undrawn yarn radiated at a spinning speed of 1800 m / min is stretched and flammable at 170 m / min, the yarn inside the package and the yarn outside the package There is a difference of about 48 hours in the time from the start of spinning to the end of stretching flammability.

The present inventors have re-studied this problem. As a result, if the aged polyester non-drawn yarn is aged for a certain period of time for a certain time, there is little difference in the dyeing properties of the non-drawn stretched sublimated yarn even if the undrawn yarn is left at different times. Discovery and reached the present invention.

In other words, the present invention provides an atmosphere in which an undrawn yarn having a birefringence of 0.01-0.05 made of polyester, in which 85 mol% or more of the polymer repeating units are ethylene telephthalate, is maintained at a constant temperature (T ° C) within a range of 20 ° -40 ° C. In the above, it is a method for producing a polyester sublime yarn having stable dyeing property by performing aging (thrs) represented by the following formula, and then performing simultaneous stretching and elongation under normal temperature and humidity conditions.

The polyester to which this invention is applied is polyester whose 85 mol% or more of a polymer repeating unit is ethylene telephthalate.

As such polyester, although polyethylene terephthalate is typical, the polyester copolymerized with 15 mol% or less of 3rd components may be sufficient. These polyesters may contain a coloring agent such as a delustering agent carbon black or other additives, such as titanium oxide, if necessary.

In the melt spinning of such polyester, a conventional method can be employed. However, in the present invention, the birefringence of the non-drawn yarn is adjusted to 0.01-0.05 by adjusting the spinning speed (the thread take-off rate in the spinning process). need.

In the case where the birefringence is less than 0.01, the orientation of the undrawn yarn is so small that it is difficult to cross the stretched combustor. On the other hand, when the birefringence exceeds 0.05, the orientation of the undrawn yarn becomes very large, and there is little improvement effect of the dyed board even when aged under the conditions described later.

Such unstretched yarn ages in the state wound up by bobbin etc. The aging is preferably carried out by placing the undrawn yarn package in an aging chamber of constant temperature and humidity and leaving it for a certain time.

The atmospheric temperature of the aging chamber is made into substantially constant temperature within the range of 20 degrees-40 degreeC. If the ambient temperature is lower than 20 ° C, aging takes a very long time, not only the production efficiency is lowered, but also maintaining the aging room at a constant temperature of 20 ° C or lower is disadvantageous economically. On the other hand, when the ambient temperature exceeds 40 ° C, crystallization of undrawn yarn is easily caused by aging, and thus, many wools are generated at the time of stretch burning, which is not preferable.

The aging time (thrs) employed in the present invention is changed by the ambient temperature (T ° C).

In other words, when the ambient temperature (T ° C) is 20 ° -30 ° C, the aging time (thrs) is

t

-211.2T+642410 (2.604-0.0486T)

t

-211.2T + 6424

It should be within the range to satisfy the aging time (thrs) when the ambient temperature (T ° C) is 30 ° -40 ° C.

t

10(3.259-0.0562T)10 (2.604-0.0486T)

t

10 (3.259-0.0562T)

It should be within the range to satisfy.

According to many experiments of the present inventors, even in the above range,

T

4024

T

40

t

10(3.1599-0.0519T)10 (2.604-0.0486T)

t

10 (3.1599-0.0519T)

It was found that the most suitable within the range of satisfying at the same time.

If the aging time is shorter than the above range, the effect of dyeing stabilization is less. If the aging time is longer than the above range, the change of dyeing proceeds rapidly, and crystallization of undrawn yarn starts, and the stretch flammability is lowered.

1 is a graph showing a change in aging time and dyeability at an atmosphere temperature of 26 ° C and 35 ° C. As evident in this figure, the aging initial stage rapidly changes the dyeing property with time, but if a certain time is exceeded, the dyeing property with time is less changed.

However, if the ambient temperature is as high as 35 ° C., the dyeing change is less than the initial dyeing change but cannot be overlooked according to the change over time. It is necessary to carry out under adjustment conditions. The upper solid line of FIG. 1 indicates the case of aging at 35 ° C. for up to 40 hours and then maintained at 20 ° C., and the dotted line indicates the case of aging for 40 hours and then left at 35 ° C. As evident in FIG. 1, when aged and left under normal temperature control conditions, there is almost no dyeing difference due to passage of time, and exhibits substantially constant dyeing properties despite the long and long standing times.

2 is a graph showing the relationship between the ambient temperature (T ° C.) and the aging time (thrs), in which the gaze portion I indicates the aging condition of the present invention, and the diagonal line Z indicates the most suitable aging condition. Indicated.

Although extending | stretching combustible processing after aging may be performed continuously to aging, you may carry out after leaving the aged unstretched yarn for 21 hours at 21 degreeC-29 degreeC, and 50-80% RH atmosphere.

As for the draw ratio in extending | stretching flammable processing, 2.0-2.8 times are preferable, and the processing temperature has preferable 160-210 degreeC.

Moreover, as for the flammability coefficient defined by following formula, 0.85-1.15 is preferable.

The polyester sublime yarn produced by the method of the present invention as described above has very few dyeing spots, and also has excellent properties such as crimp performance, wool, and unsealed smoke, and is extremely useful for woven fabrics and knitted fabrics.

Hereinafter, embodiments of the present invention will be described in detail.

EXAMPLE

A polyethylene telephthalate chip having an ultimate viscosity (measured at 35 ° C. in 0-chlorophenol) of 0.645 was spun at 292 ° C. and wound at 1800 m / min to obtain a non-drawn yarn having a birefringence of 0.0135 and a fineness of 360 de / 30 fil. This undrawn yarn was placed in an aging chamber as a package and aged under the conditions shown in the first table.

TABLE 1

After aging, the undrawn yarn package was transported to the drawn bitumen plant. At this time, the time from the aging to the start of stretching flamming was about 20 hours, and the temperature during transportation was 24 ° -29 ° C.

Stretching flamming was carried out under the following conditions in a room controlled to a temperature and humidity of 27 ℃ ± 2 ℃: 65 ± 5% RH.

The performance of the stretched polyester sublime yarn is shown in the second table.

TABLE 2

In addition, each measured value shown in the 2nd table | surface is the value measured as follows.

Sample and dyeing conditions

The stretched sublime yarn was braided by a length of 5-10 cm with respect to one sample by a single-line sealless knitting machine, and a sample of a plurality of samples (about 20 samples) was braided in a continuous cylindrical shape.

In the case of the dyeing car measurement, the undrawn yarn was processed immediately after arriving at the factory as a standard sample, and the undrawn yarn of the same lot as the sample was processed 5 days after the arrival as a measurement sample. Braided to make a sample.

The resultant was dyed for 100 minutes at 60 ° C. in a salt bath containing 2% of dye (Eastman Polyester Blue GLF) with a weight of the sample (bath ratio 1: 100) and washed with water.

Measurement of dyeing car

The degree of dyeing difference of the measurement sample with respect to the standard sample was visually determined. The degree of dyeing difference is as follows (+ indicates deeper staining than the standard sample).

Measurement of plaque

The degree of salting of the Meriya's knitted sample after staining is visually determined in the following steps, and is expressed by an average value of n = 10.

Mihaeyeon

20 m is taken so that the sample thread does not overlap at a constant tension (0.02 g / d) by a checker, and the number of unsealed edges of the sheet-shaped sample is counted.

Mou

Appearance rate of appearance of 2.5 kg wound cheese

Machinability

Thread trimming per ton

Shinshin

Elongation at Break by Cerimeter (Sample Length 50cm)

Claims (1)

In an atmosphere in which an undrawn yarn having a birefringence of 0.01-0.05 made of polyester, in which at least 85 mol% of the polymer repeating units are ethylene terephthalate, is maintained at a constant temperature (T ° C) within a range of 20 ° -40 ° C, A method for producing a polyester sublime yarn, characterized in that the aging of the marked thres is carried out, followed by stretching at the same time as stretching. 20

T

10 at 30 (2.604-0.0486T)

t

-211.2T + 6424 30

T

10 at 40 (2.604-0.0486T)

t

10 (3.259-0.0526T)

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