JPS58180610A - Production of latently self-stretching polyester filament yarn - Google Patents

Abstract

PURPOSE:A polyester filament yarn made by spinning at a specific speed is heat- treated at a temperature higher than the second-order transition point, then drawn at a temperature lower than the second-order transition point, thus producing the titled yarn with latently self-stretching properties in spite of high shrinkage in boiling water and low elongation at break. CONSTITUTION:A polyester filament yarn that has been made by spinning at 1,500-4,500m/min is heat-treated in a temperature range from the second-order transition point to 130 deg.C and drawn at a temperature lower than the second order transition point. Then, the resultant yarn is heat-treated under relax and heat treatment is repeated at a temperature higher than that in the previous heating treatment to give the objective yarn showing self-stretching properties. In the practical use, the yarn is used to form cloth, the cloth is thoroughly shrinked by relaxation, then heat-treated to effect self-stretching.

Description

DETAILED DESCRIPTION OF THE INVENTION A method for producing a polyester filament yarn having spontaneous extensibility according to the present BAt [M.

Conventionally, polyester filament yarns having spontaneous extensibility are produced by spinning condensation polymers under conditions that do not cause high crystallinity, as described in IE141-1!0 ISI Publication, for example. , at the same time or later, by stretching and orienting.

At least 2091 ton without causing high crystallinity
It has been proposed to obtain spontaneously extensible polyester filament yarns by shrinking the filaments by heating them for a period of time under conditions that permit shrinkage of the structure. However, with the yarn produced by such a method, it is not possible to obtain a yarn with a high shrinkage rate because the contraction occurs at the yarn stage, but on the contrary, the yarn stretches, and its breaking elongation is as high as 410011 or more. This resulted in a decrease in the workability of weaving and knitting, and the quality of the woven fabrics obtained using this yarn deteriorated due to causes such as "sink" and "uneven tension."

The purpose of the present invention is to improve the conventional drawbacks, and to improve the potential of spontaneous elongation due to fMK in the subsequent processing, despite the fact that the yarn has a high boiling water retention rate and a low breaking elongation. The purpose of the present invention is to propose a method for producing polyester filament yarn with a spinning speed t, so o m
/min ~ 4,500 m / polyester filament yarn obtained by drinking and spinning is heat treated at a temperature in the range of 130°C above the secondary dislocation point, and then low-temperature drawn at a temperature below the secondary dislocation point. A method for producing a potentially spontaneously extensible polyester filament yarn.

1 so below, this invention fl! The amount will be settled in detail.

The present invention uses filament yarn obtained by high-speed spinning of spring and autumn terephthalate polyesters.

Spinning speed: 1ri) s500 @ / min ~ 4,60
A range of 0 m/min is effectively used. When the 42i yarn speed is less than 1,600 m/min, the orientation of the yarn before post-stretching is low, and the rectangular drawn yarn, which is drawn at a low temperature to ensure that it is amorphous, is very irregular. Although it is stable, simply leaving it at room temperature causes changes in its physical properties, and because of this change over time, it cannot be used as a thread that provides stable quality in the next process.

Therefore, the yarn used in the method of the present invention has a length of 1,500 m/
It is necessary to spin the yarn at a speed of at least 4,500 PM/min, but if the -h1 young yarn speed exceeds 4,500 PM/min, the thermal I(!2 shrinkage rate will be low even after low-temperature drawing, and the thermal shrinkage will be high). rate 1) (Ito i
, t, hardly exhibits spontaneous extensibility.

FIG. 1 is a diagram showing the relationship between the heat shrinkage rate of yarn obtained by the method of the present invention and temperature, and shows the relationship between the temperature and the thermal shrinkage rate of the yarn obtained by the method of the present invention.
? The polyester filament yarn obtained in the range of M/min to s, o am/min was heat treated at a temperature of 105°C,
Next, the abrasive magnification was set so that stretching equivalent to the cutting elongation of 70 inches was possible, and low meter stretching was carried out at a temperature of 25°C.

The vertical axis represents the change in dry heat shrinkage of the yarn caused by this low elongation, and the horizontal axis represents the temperature change.
Shown below. 1 is a spinning speed of 1,5001 minutes.

2Fi spinning speed 2,000 m/min, 3 spinning speed 3
, 000 m/min, 4 indicates the spinning speed of 4,000 m/min, and 5 indicates the spinning speed of s, ooom/min. Taken on a length of 30ae+, the temperature change is 2 at an initial load of 2 cape/d・
It was determined by measuring the change in the total length while increasing the temperature at °C/s@e.

As is clear from Figure 1, when the spinning speed exceeds 4,500 m/min, the amount of heat shrinkage decreases, and furthermore, it shows almost no change even when the processing temperature increases. This is thought to be because when the spinning speed exceeds 4,500 spindles/min, crystallization due to high-speed spinning progresses inside the embroidery, which is caused by low-temperature drawing and prior heat treatment.

Next, in the method of the present invention, the yarn obtained by the above-mentioned high-speed spinning is heat-treated at a temperature from the second order dislocation point to 130°C.

This heat treatment is necessary to prevent changes in physical properties over time and to obtain yarn with more stable quality. If UI heat treatment is not performed, streaks, weaving steps, etc. will occur, and the quality of the product will be compromised. This is to reduce the amount of water used.

In addition, the heat treatment once must be at a temperature that is higher than the temperature at which the polyester filament yarn becomes more thermally stable and at the same time suppresses crystallization to a level lower than 6130. It is necessary that the temperature does not exceed ℃.

Figure 2 is a diagram showing an example of the relationship between heat treatment temperature and specific gravity of polyester filament yarn, #4411&n
It is a ton with specific gravity and temperature on the horizontal axis.

In the example of No. 2 and No. 1, the polyester filament yarn was spun at a spinning speed of 3,200 m/min. , at a temperature of 160°C, the specific gravity is 1.38
However, it is preferable that the specific gravity of the book produced by the method of the present invention is in the range of 1.3 SO-1,375. If the above heat treatment temperature exceeds 130°C, the crystallization inside the paddle fibers will progress and the specific gravity of the yarn will increase, and the heat shrinkage rate of the yarn will not increase even if it is stretched. In the end, it is not possible to obtain a thread that stretches spontaneously.

The thus heat-treated polyester filament yarn is subjected to low-temperature drawing. The low-temperature drawing is carried out at a temperature below the secondary dislocation point, and a range of around 70% of the cutting elongation of the undrawn yarn is effectively used. , the boiling ice yield S rate is 10- or more, and the cutting elongation is 80
- The following polyester filament yarn, in which the polyester filament yarn is subjected to a relaxation heat treatment in a subsequent step, and then subjected to a second heat change treatment at a temperature higher than the relaxation heat treatment (1) (a polyester filament yarn with more spontaneous extensibility can be obtained. That is, in actual use, a cloth is constructed using mosquito polyester filament yarns, the cloth is subjected to a relaxation treatment, the polyester filament yarns in the cloth are partially shrunk, and then heat treated. It is effective to use it in a way that allows it to expand spontaneously.

In the method of the present invention, the spinning speed is varied, and the obtained polyester filament yarn is heat-treated at a temperature of 110°C, and then the polyester filament yarn is heat-treated at a temperature of 110°C, and then the yarn is stretched so that it can be stretched to a degree of elongation equivalent to 70% of the elongation at break of the undrawn yarn. Set the magnification, take the yarn drawn at a low temperature of 25°C into a thread, and heat it at a temperature of 90°C under a load @21q//d-.
After the relaxation heat treatment, dry heat treatment was carried out at 180 °C.
It was found that when heat treated at ℃, it spontaneously elongates as shown in Figure @3. FIG. 3 is a diagram showing the relationship between the spinning speed and spontaneous elongation rate of the polyester filament used in the method of the present invention, with the spontaneous elongation rate plotted on the vertical axis and the spinning speed plotted on the horizontal axis.

v]j In the example of At+Me, the spinning speed is a, ooo
The shrimp also exhibits high spontaneous elongation between m/min and a, soom/min.

As mentioned above, the yarn obtained by the method of the present invention is
It is a latent spontaneously elongated yarn that exhibits spontaneous elongation through subsequent heat treatment, and unlike conventional spontaneously elongated yarns, it does not have a large elongation at the raw yarn stage, but rather has a high shrinkage rate as a raw yarn. This shrinkage characteristic is utilized to make the structure of the woven or knitted material dense and the yarn bending large, and then heat-treated to develop spontaneous elongation. In this case, it is possible to achieve effects that could not be achieved.

In addition, the polyester filament yarn is heat-treated before low-temperature drawing to have more stable physical properties,
With this Kyo-sho, there is no need to create a spontaneously elongated yarn as in the past, and it is possible to apply spontaneous elongation treatment in any process, for example, after forming a fabric, etc. .

In addition, when using spontaneously elongated yarn to improve the texture of textiles,
This book is useful for spontaneous growth rates ranging from 2 to 3% to about 10-10%.

[Brief explanation of drawings]

Figure 1 is a diagram showing the relationship between heat shrinkage rate and temperature of yarn obtained by the method of the present invention, Figure 2 is a diagram showing an example of the relationship between heat treatment temperature and specific gravity of polyester filament yarn, and Figure 3 is a diagram showing an example of the relationship between heat treatment temperature and specific gravity of polyester filament yarn. , is a diagram showing the relationship between spinning speed and spontaneous elongation rate of polyester filaments used in the method of the present invention. 5 Raken 11 Constant fever 'filwoll, shi! m (°C,) 2nd
)] Me3)2 υprofit! (”/=) =52-

Claims (1)

[Claims] Spinning speed 1,600m/min~4. sOOm A polyester filament yarn obtained by spinning in 7 minutes is heat treated at a temperature of 110°C or above the tertiary dislocation point, and then low-temperature drawn at a temperature below the secondary dislocation point. Method for producing extensible polyester filament yarn.