JPS60181334A - High speed warping method of highly oriented polyester unstretched yarn - 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 A0 Technical Field of the Invention The present invention relates to a high-speed warping method for undrawn highly oriented polyester yarn.

B. Conventional technology and problems Birefringence 0 obtained by high speed spinning using conventional melt spinning method
,06~0.135.Secondary yield stress 1~2g/(
Since the highly oriented undrawn polyester yarn of 1 is not subjected to a drawing process, it has excellent productivity and uniformity of quality, and can be expected to significantly reduce costs by using it as is for producing knitted fabrics.

However, the secondary yield point stress of the highly oriented undrawn polyester yarn is 0 or less than 2/6 of that of a normal drawn yarn, so if excessive tension is applied during the warping process, it will be easily stretched and permanent deformation will occur. When knitted fabrics are dyed using f+, the stretched portions become streaked in spots, which causes a significant decrease in product yield.

Excessive tension in the warping process is caused by an abnormality in the yarn path from the yarn package of the individual yarns constituting the yarn sheet to the winding beam.

This mainly occurs when the warping machine is stopped or started due to fuzz, yarn breakage, etc.

The increase in tension when stopping and starting such a warping machine is
As the warping speed increases, it increases to 11, resulting in excessive tension.9
easy. The main reason for this is that during the warping process from the creel fitted with the yarn package to the take-up beam, the respective stopping and starting behavior of the front roller and the take-up beam, which are located upstream of the first take-up beam, is This is because there is no synchronization over a range of amounts. In the case of ordinary drawn yarn, the yarn physical properties are stable, so the above-mentioned non-synchronization does not pose a particular problem even in high-speed warping at a warping speed of 500 m/min or more.

For the reasons mentioned above, it is difficult to warp highly oriented polyester undrawn yarns at high speeds, and the reality is that warping is usually performed at a low speed of less than 5 DOm/min.

As a conventional countermeasure, in high-speed warping,
One way to prevent sudden changes in tension is to take a longer time to start and stop the warper. However, with this method, when starting up and stopping, unless the stopping distance is long, fluff and broken yarn ends will be caught in the beam, requiring several times the warping space and equipment. There are problems in terms of investment and work efficiency.

In addition, as a second measure, the yarn sheet is stretched on a warper to the extent that the physical properties of the undrawn highly oriented polyester yarn are stabilized, and then wound around a beam.
There are 5936 methods. According to this method, the physical properties of the constituent threads of the yarn sheet are stabilized, so that the problem of partial stretching due to excessive tension is resolved. However, it may be necessary to install a new, expensive, specialized machine, and because the drawing process is involved, efficiency decreases due to yarn breakage, and the quality of the yarn sheet varies due to the stoppage of the warper, so high-speed warping is not possible. It was difficult.

C1 Object of the Invention The present invention provides a low-cost, high-speed warping method for highly oriented undrawn polyester yarn, which improves the drawbacks of conventional high-speed warping methods. - D00 Configuration of the present invention The present invention has the following configuration. In other words, birefringence is 0
．． 06~0.135. Secondary yield point stress is 1~2g/cl
A high-speed warping method for highly oriented undrawn polyester yarn, characterized in that the maximum warping tension is T≦0.8P and the warping is performed at a speed of 500 m/min or less. It's a method.

Here, T represents the maximum warping tension (g,/d) and P represents the secondary yield point stress (g/d) of the highly oriented undrawn polyester yarn.

The configuration of the present invention will be explained in detail below.

The above-mentioned highly oriented polyester undrawn yarn in the present invention is
A multifilament yarn or monofilament yarn whose main component is ethylene terephthalate units, and whose birefringence is 0.06 to 0.155.2.
The yarn has a next yield point stress of 1 to 2 g/d. Such a yarn is produced by melt spinning, e.g. 4,000 m.
It is easily obtained by taking off the yarn at a high speed of 7 minutes or more. If the birefringence is less than 0.06, it will be easily deformed even by a slight external force, and as it is, it will be of no practical use. However, when the birefringence increases beyond o and iss, it becomes an orientation region of the drawn yarn.11 Ordinarily, it is difficult to achieve orientation only by high-speed spinning.

The secondary yield point stress indicates the stress at the point on the S, S curve where plastic deformation begins, and is a characteristic that usually changes depending on the degree of orientation. For example, JP-A-58-1695.4
It can be measured using 9 methods.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a warping process diagram showing an example of an embodiment of the present invention.

In FIG. 1, the highly oriented polyester undrawn yarn pulled out from the yarn package 2 fitted in the creel 1 is
The yarn passes through the tension adjustment device 6 and the yarn breakage detector 4, is collected on the porous yarn collection plate 5, and is arranged in a sheet shape to produce yarn.
form. Next.

The tension is adjusted via a pair of front reeds 6, 71, fuzz detector 8, and rear reed 9, and the tension is adjusted to 500 in parallel arrangement.
It is wound onto the beam 10 at a speed of more than m/min. Note 1
In the present invention, the warping speed is replaced by the winding speed of the beam 10. Also.

The warping tension refers to the tension of the yarn sheet between the rear reed 9 and the beam 10 when the yarn is running.

During warping, when a defective part of the yarn such as a single fluff, broken yarn end, yarn line, or slack passes, the yarn breakage detector 4 or the fluff detector 8 outputs an output, and the stop signal causes the front rollers 6,
6/ and a brake is applied to the beam 10 to stop the warping machine. Since the inertia of the beam 1o changes depending on the amount of beam winding, the front roller 6.6
It is difficult to completely synchronize the stopping behavior with ′.

Also, if the front roller 6, 6' and the shipim 1o stop early.

The yarn sheet H becomes slack, which significantly reduces the beam quality, and the threads in adjacent yarn sheets H are mutually twisted through the liquid seal that constitutes the front liquid 7 and the rear reed 9.
Work efficiency deteriorates due to the phenomenon that the liquid gets caught in the liquid seal and does not pass through, so-called sticking. Therefore 1
In a normal warping machine, the stop of the beam 10 is adjusted to be slightly delayed by the front roller 6.degree. 6' to prevent troubles caused by slack in the yarn sheet H. In normal commercially available warping methods, the time required to stop from a warping speed of 1.2 DO+++/min is about 0.6 to 0.6 seconds, and the beam requires an additional 0.05 to 0.1 seconds. It is normal for it to stop late.

As described above, in the warping machine, the stopping behavior of the front roller and the beam roller is adjusted to the full winding volume of the beam, and the stopping behavior of the beam is slightly delayed compared to the front roller, so that the yarn sheet is always kept under tension, and the yarn sheet is kept under tension. This prevents troubles caused by sagging sheets. As already mentioned, in the case of ordinary drawn yarn, the above-mentioned increase in tension in the yarn sheet due to the stoppage of the warping machine is absorbed, and troubles such as streaks due to partial drawing do not occur. However, in the case of highly oriented polyester undrawn yarns, the secondary yield point stress is lower than that of drawn yarns, so the increase in tension caused by the warping machine stop cannot be absorbed, and partial stretching occurs.

Figure 2 shows the secondary yield point stress P (g
/d) and warping tension T (g/d).

Figure 2 shows warping at a speed of 1.200 m and 7 minutes in the process shown in Figure 1 using various highly oriented polyester undrawn yarns with secondary yield point stresses in the range of 1 to 2 g/d. do the
By stopping the warping machine midway through the process and varying the maximum warping tension at the time of stopping, the material is wound into a beam, knitted into a tricot, and dyed.

This study investigated the relationship between warping tension and striations during high-speed warping.

In Fig. 2, the area where streaks do not occur is the area shown by the shaded line, and the maximum warping tension T (g/d) that does not cause streaks is the secondary yield point stress yP (g/d) of the highly oriented polyester undrawn yarn. /
d). The area in Figure 2 that does not overlap with 7 is the direction. coefficient.

Then, it is expressed by the linear equation T≦βP. P in Figure 2
If the direction coefficient β of the boundary line is calculated from the numerical relationship between

That is, in the high-speed warping method for highly oriented undrawn polyester yarn of the present invention, warping is carried out at a speed of 500 m/min or more with a maximum warping tension of Ta2.8P. Here, T represents the maximum warping tension (gz4) and P represents the secondary yield point stress (g/d>) of the highly oriented undrawn polyester yarn.

In the present invention, the point where the maximum warping tension T (g/d) is lower than the secondary yield stress P (g/+U) of the highly oriented undrawn polyester yarn can be considered as follows. That is, S- S-curves are measured at low deformation speeds, usually less than 1 m/min.In contrast, in high-speed warping, 1,200 m/min.
This is a high-speed deformation in a short time of 0.6 seconds or less from a speed of approximately 1/min to a stop. In other words, it is presumed that the tension acts impulsively on the yarn, resulting in different deformation behavior.

For example, even if the maximum warping tension is less than the secondary yield point stress, it is thought that plastic deformation occurs without elastic recovery due to the impact tension, but this is not clear.

The method of the present invention warps at the maximum warping tension described above.

This can be carried out in the following manner.

First of all, synchronization of the stopping behavior of the front roller and the beam,
The goal is to improve the accuracy of the process. In other words, should we lengthen the time it takes for the front rollers to stop?

Alternatively, by shortening the time it takes for the beam to stop, or by making the time it takes for the beam to stop at the beginning of winding, where the beam inertia is small, to be equal to the stopping time for the front roller, or by slightly shortening it, the beam inertia can be increased. This is a method of reducing the difference in stopping time between the beam and the front roller at the end of winding. Specifically, this can be easily achieved by adjusting the electromagnetic brake of the front roller or the beam. This method can be applied to highly oriented undrawn polyester yarns that have a relatively high secondary yield point stress. In addition, when the secondary yield point stress is low,
The second method is as follows. That is,
In this method, either the front roller or the beam braking characteristics is approximated to the other's braking characteristics by detecting changes in the inertia of the beam or changes in the tension of the front roller due to the winding amount.

That is, it is a method of keeping the difference in stopping time between two beams constant within a certain range in response to changes in inertia of the beam. There are methods such as Japanese Patent Publication No. 58-7746. As a sixth method, by incorporating a device such as a dancer roller into the warping process system of the present invention shown in Figure 1, the process length of the yarn sheet can be freely adjusted according to the tension. This method absorbs sudden changes in tension. For example, JP-A-52-70141. Unexamined Japanese Patent Publication 1986-7
There are methods such as 3135. As the fourth method, there is a method in which the above-mentioned second and third methods are appropriately combined. In any case, any method may be used as long as it can be carried out within the range of the maximum warping tension according to the method of the present invention.

In the warping method of the present invention, the warping tension in a steady state is not particularly limited, but is usually around 0.2 g/d,
Or you can set it to a lower level.
It is possible to suitably warp.

Further, the highly oriented undrawn polyester yarn used in the present invention may be a copolymer containing ethylene terephthalate units as a main component, or may be a composite yarn with other polymers having different properties.

Coloring agents such as pigments, matting agents, antistatic agents.

It may contain additives such as moisture absorption. Further, the cross section of the yarn may be not only circular but also irregularly shaped such as a triangle. Further, in order to impart cohesiveness to the yarn, appropriate interlacing may be applied to the yarn.

E00 Effects of the Present Invention According to the present invention, high-speed warping of highly oriented polyester undrawn yarn, which has been difficult in the past, becomes possible. Therefore, productivity can be improved and costs can be significantly reduced. Moreover, since the fabric is not stretched during warping, the resulting knitted fabric does not have any spot-like stripes.

Examples and Comparative Examples Birefringence 0.075. Secondary yield point stress 1.05 g/d
and birefringence 0.11.secondary yield point stress 1.62g,
'a' two types of highly oriented polyester undrawn yarn 75D-36
Using 588 pieces of each F, they were passed through the warping process shown in Figure 1 at a warping tension of 0.2 g/a and a warping speed of 1,000 m/min, with a flange diameter of 53 cmφ, a width of 53 cn+, and a body diameter of 20 c+nφ.
When the wire was wound onto a beam of The warping machine was stopped and warping was performed again to produce a winding beam with a winding length of 10,000 m. The obtained beam is 28G
The fabric was knitted into a half tricot using a two-reed tricot machine, dyed with a dispersion dye in a conventional manner, and inspected for spot-like stripes. Separately, as comparative examples, only the maximum warping tension was 1.20 g/a (Comparative Example 1) and 1.86 g/d under the same conditions.
(Comparative Example 2) was changed to warp, and streaks were inspected in the same manner. The results are shown in Table 1.

Table 1 In Examples 1.2, spot-like streaks were not generated on the knitted fabric, but in Comparative Example 1.2, spot-like streaks were observed.

[Brief explanation of drawings]

Fig. 1 is a warping process diagram showing an example of the embodiment of the present invention, and Fig. 2 is a diagram showing the maximum warping tension in the method of the present invention.
It is a figure which shows the relationship between the next yield point stress and warping tension. 1: Creel 2: Yarn cage 6: Tension adjustment device 4: Yarn breakage detector 5: Porous yarn collector plate 6.6/ : Front roller 7: Front reed 8: Fuzz detector 9: Rear reed 10: Beam H: Yarn sheet T: Maximum warping tension P: Secondary yield point stress Patent applicant Toshi Co., Ltd.

Claims (1)

[Claims] Birefringence is 0.06 to 0.155. Secondary yield point stress is 1 to 0.155.
In the warping method for highly oriented polyester undrawn yarn of 2 g/d, the maximum warping tension is T≦0.8P. A method for high-speed warping of undrawn highly oriented polyester yarn, which comprises warping at a speed of 500 m/min or more. Here, T represents the maximum warping tension (g/d) and P represents the secondary yield point stress (B/d) of the highly oriented undrawn polyester yarn.