JPS62215012A - Multi-spindle direct spinning and drawing of polyester fiber - Google Patents

Abstract

PURPOSE:To suppress lateral fluctuation of a number of yarn groups, to eliminate yarn breakage caused by the mutual entanglement of yarn groups and to improve the uniformity of yarn, by using an inversely tapered multi-stage heating roller as the second godet roller for a direct spinning and drawing process. CONSTITUTION:The spun yarn extruded through a spinneret 1 is cooled and solidified with a cooler 2, divided into plural yarn groups Y1-Y4 with an oiling apparatus 3 and oiled while collecting the yarn to each group. Each yarn group is taken up with a first godet roller 4 and drawn between the first godet roller 4 and a second godet roller 5 at a draw ratio determined by the difference of circumferential speeds of the rollers 4, 5. The drawn yarn is wound with a winder 6 in the form of a package 7. The second godet roller 5 is constituted of multiple-stage heating rollers 5a, 5b having inversely tapered form.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for direct spinning and drawing of polyester fibers, and more specifically, a method for direct spinning and drawing of polyester fibers, and more specifically, a method for direct spinning and drawing of polyester fibers, and more specifically, a method for direct spinning and drawing of polyester fibers. This invention relates to a spinning and drawing method.

(Prior Art) A direct spinning/drawing method in which polyester is melt-spun, cooled and solidified, taken up by a first godet roller, and then heated and stretched between the first godet roller and a heated second godet roller has already been well known. This method is well known and has come to be widely adopted as a method for producing polyester fibers with high productivity.

On the other hand, when producing intermediately oriented polyester fibers by high-speed spinning, after taking off the spun yarn, the diameter of the spun yarn increases sequentially from the yarn input side to the yarn output side. In JP-A-5, it was discovered that sagging and wobbling of the yarn during heat treatment could be prevented by winding the yarn several times around a tapered heating roller.
It is known from the publication No. 0-88331.

(Problems to be Solved by the Invention) In order to further improve productivity in the direct spinning/drawing method, a so-called multi-spindle direct spinning/drawing method is adopted in which a plurality of groups of spun yarns are drawn between a pair of godet rollers. , the yarn sway on the heated godet roller increases, yarn breakage and heat treatment unevenness occur due to yarn overlap, etc., and if even one yarn in a group of yarns breaks, it will cause the yarn on the godet roller to break. The threads become tangled in the threads, causing all the threads to break.
By using multiple spindles, productivity will actually decrease.

Furthermore, JP-A No. 50-88331 only describes that a reverse taper type heating roller is used to prevent yarn sagging and yarn wobbling during high-speed spinning, and that There is no teaching at all about this, and even if this inverted tapered heating roller is used as a heating godet roller for multi-spindle direct spinning and drawing, if one of a large number of yarn groups breaks, the problem will occur. There still remains the problem that all yarn groups on the heating godet roller are broken, resulting in reduced productivity.

An object of the present invention is to provide a multi-spindle direct spinning/drawing method for polyester fibers which eliminates the problems of the prior art, causes fewer dye spots and yarn breakage, and is highly productive.

(Means for Solving the Problems) As a result of repeated studies by the present inventors to achieve the above object,
As a heated second godet roller in direct spinning and drawing,
It was discovered that a reverse taper multi-stage heating roller could be used, and the present invention was achieved.

That is, the present invention provides a method in which polyester is melt-spun, cooled and solidified, taken up by a first godet roller, and then drawn between the first godet roller and a heated second godet roller. Multi-spindle direct spinning of polyester fibers, characterized in that the spun yarn is wound and drawn around a second godet roller consisting of reverse taper multi-stage heating rollers whose temperature is controlled independently for each stage. This is a stretching method.

The method of the present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic front view showing an example of a multi-spindle direct spinning/drawing apparatus for implementing the method of the present invention, FIG. 2 is a side view showing an example of a second godet roller, and FIG. 3 is a schematic front view showing an example of the second godet roller. FIG.

Polyester is melted and discharged from a spinneret 1, cooled and solidified in a cooling device 2, and then divided into a plurality of yarn groups Y3, Y2, Y3, and Y4 in an oil supply device 3 while converging and applying a predetermined oil. Added to yarn.

Thereafter, the first godet roller 4 takes over the
The film is stretched to a predetermined magnification between the godet roller 4 and the second rear roller 5 due to the difference in circumferential speed between both rollers, and then wound up into a package 7 by a winder 6.

Note that 4' and 5' are separate rollers provided for the first godet roller 4 and the second godet roller 5, respectively.

As shown in FIG. 2, the second godet roller 5 is composed of multi-stage inverted tapered heating rollers 5a and 5b, and some of the yarn groups Y1 and Y2 are inverted. The remaining yarn groups Y3 and Ya are attached to the tapered heating roller 5a.
is wound around the reverse taper heating roller 5b, stretched and heat treated. The multi-stage reverse taper heating rollers 5a and 5b have independent heaters lla and llb built in, respectively, as shown in FIG. The temperature is controlled independently.

In addition, 13 is a converter, 14 is a temperature instruction controller, 15
is a drive motor for the second godet roller 5.

In the method of the present invention, after the yarn discharged from the spinneret 1 is cooled and solidified, it is heated by an oil supply device 3 or the like within 1 m from the spinneret surface.
It is preferable to divide and bundle the yarn into a plurality of yarn groups Y+, Yt, Y:l, and Y4 in order to reduce yarn breakage. still,
To divide the spun yarn into a plurality of yarn groups, as shown in Fig. 1, in addition to dividing and converging using the oil supply device 3, etc., a dividing spinneret is used to divide the spun yarn into a plurality of yarn groups at the time of discharge. The yarn may be divided into thread groups, and each thread group may be bundled by the oil supply device 3 or the like.

Further, the take-up speed by the first godet roller 4 is 450
It is desirable to set the speed to 0 m/min or more in order to reduce staining spots and improve strength and elongation properties.

If the take-up speed of the first godet roller 4 is less than 4500 m/min, or even if the take-up speed is 4500 m/min or more, the first godet roller 4 may 4 is also the second
Like the godet roller 5, it is preferable to use a reverse taper multistage heating roller whose temperature is controlled independently for each stage.

The polyester used in the present invention is mainly a polyester having ethylene terephthalate as a main repeating unit, but it may also be a polyester having butylene terephthalate as a repeating unit, or may contain a small amount of one or more other components. Copolymerized polyester may also be used. Furthermore,
It may also be a polyester containing small amounts of additives.

(Function) In the method of the present invention, since a reverse taper heating roller is used as the second godet roller, yarn wobbling on the second godet roller is suppressed, and occurrence of yarn breakage and heat treatment unevenness due to yarn path curling etc. is prevented. can do.

Furthermore, since the second godet roller is composed of multi-stage reverse taper heating rollers, and a large number of thread groups are wound separately in each stage, even if one of the threads breaks, the Although the yarn groups wound together with the yarns in one stage are broken, the yarn groups wound in other stages are not affected in any way and can continue spinning and drawing.

Therefore, it is possible to prevent a decrease in productivity due to yarn breakage.

In addition, because the temperature of the reverse taper multi-stage heating roller is controlled independently for each stage, there are fewer temperature irregularities in the length direction of the heating roller (there are fewer heat treatment irregularities between yarn groups, reducing dyeing irregularities). can be reduced.

(Effects of the Invention) According to the method of the present invention, yarn breakage in multi-spindle direct spinning and drawing can be reduced, and polyester fibers with less dyeing spots can be produced with high productivity.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing an example of a multi-spindle direct spinning/drawing apparatus for carrying out the method of the present invention, FIG. 2 is a side view showing an example of the second godet roller used in the method of the present invention, and FIG. FIG. 3 is a longitudinal sectional side view of the second godet roller of FIG. 2; 1... Spinneret, 3... Oil supply device, 4... First godet roller, 5... Second godet roller, 5a, 5b...・Reverse taper multi-stage heating roller, 11
a, llb...Heater, 12a, 12b...Temperature detection end, YI, Y2,
Y3, Y4... Multiple yarn groups.

Claims (1)

[Claims] 1. After melt-spinning polyester and solidifying it by cooling, the first
In a method in which the spun yarn is taken up by a godet roller and then stretched between the first godet roller and a heated second godet roller, the temperature of the spun yarn divided into a plurality of yarn groups is independently controlled for each stage. 1. A multi-spindle direct spinning and drawing method for polyester fibers, which comprises winding and drawing polyester fibers around a second godet roller consisting of a reverse taper multi-stage heating roller. 2. The first godet roller is a reverse taper multi-stage heating roller whose temperature is independently controlled for each stage of the spun yarn divided into a plurality of yarn groups, as set forth in claim 1. Multi-spindle direct spinning and drawing method of polyester fiber.