JPH0713326B2 - Direct spinning and drawing method for polyester fiber - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for directly drawing a polyester fiber by spinning.
More specifically, the present invention relates to a method for directly spinning a polyester fiber, which has good operability and economic efficiency and can obtain a uniform drawn yarn.

(Prior Art) Conventionally, as a polyester raw yarn for woven and knitting, a draw-up speed of 10
It is common to use the drawn yarn obtained by drawing the undrawn yarn drawn at 00 to 1500 m / min while heating it to the glass transition temperature (about 70 ° C) of the polyester fiber (hereinafter, separately described. Sometimes called the law).

However, the polyester drawn yarn obtained by such a method has a large number of steps, resulting in high production cost.

Therefore, a direct spinning / drawing method in which the spinning process and the drawing process are directly connected is being put into practice.

With such a direct spinning and drawing method, the mechanical properties and the degree of identification of the drawn yarn obtained by the conventional separate drawing method can be obtained, but the drawing must be performed at an extremely high speed as compared with the separate drawing method. In order to obtain a uniform drawn yarn without spots, it is important that the yarn is heated uniformly above the glass transition temperature.

Therefore, extremely advanced heat treatment technology is required, such as the need to develop a high-performance heating device.

In particular, when a plurality of yarns are drawn and drawn by using a heating roller as a heating device, if the take-up speed exceeds 4000m / min, adjacent yarns come into contact with each other on the heating roller and a yarn break occurs. There is also the problem that it is easy.

A method capable of solving such a problem is proposed in JP-A-57-16913 and JP-A-57-16914.

In this method, unstretched polyester yarn obtained by pulling at a take-up speed of 5000 m / min or more is subjected to a tension heat treatment of 20% or less without heating.

Certainly, according to such a method, the yarn breakage due to the yarn contact on the roller can be prevented, but the yarn breakage, feathers, etc. are still likely to occur because the yarn is not heated during the drawing.

Further, as proposed in Japanese Examined Patent Publication No. 48-43564 and Japanese Unexamined Patent Publication No. 52-66724, the interlace nozzle shown in British Patent No. 924089, that is, two interlaced nozzles opened in the wall surface. A direct spinning and drawing method has also been attempted in which interlacing nozzles in which the center lines of fluid injection holes intersect each other are used to impart entanglement to a yarn, and then the yarn is drawn and further drawn.

However, in the above direct spinning and drawing method, although the occurrence of yarn breakage and fluff in the drawing step is reduced, the obtained drawn yarn is liable to cause dyeing spots (hereinafter sometimes referred to as dye spots). found.

(Object of the invention) The object of the present invention is to use a polyester undrawn obtained at a high take-up speed, to produce a drawn yarn with very few occurrence of yarn breakage and fluff, and good levelness It is to provide a spinning and drawing method.

(Structure) As a result of studies to achieve the above-mentioned object, the inventors of the present invention have obtained a yarn in which 3 to 6 fluid injection holes are entangled with an interlaced nozzle which is vertically formed in the wall surface. Peripheral speed
It has been found that a drawn yarn having very few yarn breakages and fluffs and good leveling property can be obtained by drawing it on a heating roller rotating at 4000 m / min or more and then drawing it, and arrived at the present invention.

That is, according to the present invention, a polyester yarn obtained by melt-discharging, cooling and solidifying is drawn by a fluid injection nozzle and then taken up by a take-up roller. When extending between the two, the fluid injection nozzle has 3 to 6 fluid injection holes formed in the wall surface perpendicularly to the thread guide hole wall surface, and the center line of each fluid injection hole is one point. It is a method for direct spinning and drawing polyester fibers, which comprises using intersecting nozzles and rotating a take-up roller at a peripheral speed of 4000 m / min or more.

The present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a vertical sectional view showing an example of a fluid jet nozzle used in the present invention, and FIG. 3 is a preferred take-up roller and / or a take-up roller used in the present invention. Alternatively, a side view showing an example of the stretching roller is shown.

In FIG. 1, the polyester yarn (Y) discharged from the melt spinneret (1) was cooled and solidified while passing through a cooling tube (3), and then a prescribed amount of oil agent was applied by an oil supply device (4). Then, it is taken up by the take-up roller (6). The yarn thus taken up is continuously drawn between the take-up roller (6) and the drawing roller (7), passes through the guide (8) and is taken up by the winder (9).

In the present invention, the polyester yarn (Y) that has been cooled and solidified needs to be taken up by a roller rotating at a peripheral speed of 4000 m / min or more after being entangled with the fluid jet nozzle (5). .

The fluid ejection nozzle is the nozzle shown in FIG. 2, that is, 3 to 6 fluid ejection holes (12) are formed in the wall surface of the thread guide hole (11) perpendicularly to the wall surface, and It is important to use a nozzle where the center lines of the injection holes (12) intersect at one point.

By confounding the yarn by using such a fluid jet nozzle, the yarn can be bundled, so that the occurrence of yarn breakage and fluff during drawing can be significantly reduced. In addition, most of the entanglement imparted to the yarn is abraded during drawing and the residual entanglement that causes stains is extremely small, so that a uniform stretched yarn without stains can be obtained.

On the other hand, when a fluid injection nozzle having the number of openings of the fluid injection holes (12) of 2 or less is used, it is possible to remarkably reduce the occurrence of yarn breakage and fluff during the drawing, but a large number of entanglements are generated after the drawing. It remains and causes spots.

As described above, by using the fluid injection nozzle having the number of openings of the fluid injection hole (12) of 3 to 6, a slight entanglement in which most of the entanglement is eliminated during stretching (hereinafter, may be referred to as microentanglement). It will be described with reference to FIG. 4 whether or not (Yes) can be given.

FIG. 4 is an explanatory view for explaining the action mechanism of the fluid ejection nozzle used in the present invention.

FIGS. 4 (a) and 4 (b) respectively show a fluid ejection nozzle in which the number of openings of the fluid ejection hole (12) is three or two.

As shown in FIG. 4, the fluids ejected from the respective fluid ejection holes (12) are provided so that their center lines intersect at one point, so they collide with each other to generate vortices. The size of such a vortex is larger than that of the nozzle having three fluid ejection holes shown in FIG. 4 (a), which is two, compared with the nozzle having two fluid ejection holes shown in FIG. 4 (b). Things get bigger.

Therefore, in the nozzle of FIG. 4 (b), the constituent filaments of the yarn in the yarn guide hole (11) are swung greatly, so that high-strength entanglement is imparted to the yarn. In the nozzle of (a), since the size of the fluid vortex is small and local, the constituent filaments of the yarn in the yarn guide hole (11) are only swirled locally, and A low-strength (mild) entanglement is imparted.

The light entanglement thus imparted is preferably 2 to 40 pcs / m as measured by the slide pin count method.

The degree of entanglement by the slide pin count method is measured as follows.

That is, one end of the yarn unwound from the bobbin is hung on the hook and the yarn convention of 1.5 m is hung vertically with no load (self-weight), and a pin with a weight of (total denier x number of single yarn / 90,000) g is Insert it in the center of the filament bundle at the upper end, and put the pin 3-5 cm /
When the pin is stopped, pull it down from the thread, insert the pin again 5 to 10 mm below the stop point, and repeat the above operation. In this way, the distance (cm) between pin stop points was measured 20 times in succession, and the average value (c
m) and calculate the confounding number (K / m) from the following formula.

Number of entanglements (ke / m) = 100 / This "slide pin count method" measures minute and slight entanglements that cannot be accurately measured by the hook-drop method (see US Pat. No. 3,290,932) that has been widely used in the past. It is a method suitable for the method, and the entanglement coefficient (Coherency Coefficient) by the hook-drop method is applied to a yarn having an entanglement degree of 2 to 40 / m measured by the "slide / pin count method".
Factor) is usually about 0 to 1.8.

As a fluid ejection nozzle that imparts such an entanglement number to the yarn, it is necessary that the number of the fluid ejection holes is 3 to 6. If the number of openings exceeds 6, the number of entanglements provided is less than 2 / m, which is not preferable.

The take-up roller (6) shown in Fig. 1 has a surface temperature of 60 to 90 ° C.
It is preferable to heat within the range because of better stretchability. If the peripheral speed of the take-up roller (6) is less than 4000 m / min, the draw ratio must be excessively increased, and yarn breakage or fluff occurs during drawing.

In the present invention, the take-up roller (6) and / or the stretching roller (7) is preferably a multi-stage taper type roller in which a plurality of reverse taper type rollers are joined in series as shown in FIG. By adopting such a roller,
When turning the yarn on the roller when making multiple yarns,
Since the angle of inclination of the yarn can be reduced and the yarn tension on the roller due to the tapered shape can be increased, the yarn wobbling can be reduced. Moreover, even if a yarn break occurs in one of a plurality of yarn groups, the yarn break naturally stays in the yarn group and does not cause a break in the adjacent yarn groups. It is possible to prevent a decrease in yield due to

The taper shape of such a taper type roller is not preferably such that the roller diameter increases at 1 to 6% in the traveling direction of the yarn.

The take-up roller (6) shown in Fig. 1 has a surface temperature of 60 to 90 ° C.
It is preferable to heat within the range because of better stretchability. If the peripheral speed of the take-up roller (6) is less than 4000 m / min, the draw ratio must be excessively increased, and yarn breakage or fluff occurs during drawing.

In the present invention, it is preferable that the take-up roller (6) and / or the stretching roller (7) be a multi-breakage taper type roller in which a plurality of reverse taper type rollers are joined in series as shown in FIG. By adopting such a roller,
When turning the yarn on the roller when making multiple yarns,
Since the angle of inclination of the yarn can be reduced and the yarn tension on the roller due to the tapered shape can be increased, the yarn wobbling can be reduced. Moreover, even if a yarn break occurs in one of a plurality of yarn groups, the yarn break remains in the yarn group and does not cause a break in an adjacent yarn group. Can be prevented.

The taper shape of the taper type roller is preferably such that the roller diameter increases by 1 to 6% in the traveling direction of the yarn.

The term "polyester" as used in the present invention mainly refers to a polyester composed of 90 mol% or more of ethylene terephthalate, but 10 mol% or less of other components such as isophthalic acid, phthalic acid, oxybenzoic acid, and a sulfonate compound. It may be obtained by copolymerizing or blending a monomer such as polyethylene glycol or tetramethylene glycol or a low polymer thereof.

A small amount of matting agent, antistatic agent, dye improving agent and the like may be added to the polyester.

(Operation) According to the present invention, a yarn is lightly entangled, that is, most of the yarn is drawn at the time of drawing, by using a fluid injection nozzle having 3 to 6 fluid injection holes opened perpendicularly to the wall surface. The entanglement that disappears is added to improve the yarn converging property, and the yarn is collected at 4000 m / min or more,
Subsequent cold drawing can significantly reduce the occurrence of yarn breakage and fluff during drawing.

In addition, it is possible to obtain a stretched yarn having very little residual entanglement that tends to cause dyeing unevenness in the finally obtained fabric.

(Effects of the Invention) The polyester fiber obtained by the present invention has the same performance as the drawn yarn obtained by the conventional extra-drawing method, and can be used in all fields to which the conventional drawn yarn is applied.

(Examples) Hereinafter, the present invention will be described more specifically with reference to Examples.

Example Using the apparatus shown in FIG. 1, polyethylene terephthalate was produced with a die hole diameter of 0.2 mm, 36 holes, a discharge rate of 35 g / min, and a spinning temperature of 290 ° C.
After melt-spinning with and solidifying by cooling, an oil agent is applied to the fluid injection hole 3
The take-up roller [1st godet roller (1G)
R)], and then the first godet roller and the stretching roller [second] rotating at the peripheral speed ratio (stretching ratio) shown in Table 1.
Godet roller (2nd GR)]. The yarn guide is a system in which eight yarns are divided into two groups of four and are turned to the first and second godet rollers having two stages of 3% taper angle,
The temperatures of the first godet roller and the second godet roller are respectively
Winding was performed at 80 ° C. and 120 ° C. with a winding machine set to a winding speed 1% lower than that of the second godet roller. Table 1 also shows the peripheral speed ratio between the first godet roller and the second godet roller, the process tone, and the quality of the obtained drawn yarn.

The number of entanglements before and after stretching shown in Table 1 was measured by the slide pin count method, and the uneven dyeing was visually determined after dyeing the obtained stretched yarn into a tubular knitting (full score: 5.
0 points are 3.0 points or more).

Further, the process condition was expressed as good (◯) when the rate of occurrence of yarn breakage when winding 100 pieces of 10 kg was 5% or less, and when the rate was more than 50%, it was expressed as bad (x).

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a vertical sectional view showing an example of a fluid ejection nozzle used in the present invention, and FIG. 3 is a preferred take-off roller and / or used in the present invention. FIG. 4 is a side view showing an example of the stretching roller, and FIG. 4 is an explanatory view for explaining the working mechanism of the fluid ejection nozzle used in the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakazu Fujita 77 Kitayoshida-cho, Matsuyama-shi, Ehime Teijin Limited Stock Company Matsuyama Factory (72) Kenichi Nakata 77, Kitayoshida-cho, Matsuyama-shi Ehime Teijin Limited Matsuyama Factory (72) Inventor Katsutoshi Taniguchi 77 Kitayoshida-cho, Matsuyama City, Ehime Prefecture Matsuyama Factory, Teijin Limited (56) References JP-A-60-199916 (JP, A) JP-A-62-141118 (JP) , A) JP 62-104914 (JP, A) JP 59-47726 (JP, B2)

Claims (2)

[Claims] 1. A polyester yarn obtained by melt-discharging, cooling and solidifying, which is entangled with a fluid injection nozzle, is then taken up by a take-up roller, and is not taken up once but between the take-up roller and the drawing roller. Upon stretching, 3 to 6 fluid injection holes are formed on the wall surface of the thread guide hole as the fluid injection nozzles perpendicularly to the wall surface of the thread guide hole, and the center lines of the respective fluid injection holes intersect at one point. A method for direct spinning and drawing polyester fibers, characterized in that the take-up roller is a heating roller having a peripheral speed of 4000 m / min or more. 2. The method for spinning and drawing polyester fibers according to claim 1, wherein the take-up roller and / or the drawing roller is a multistage reverse taper type roller in which a plurality of reverse taper type rollers are joined in series.