JPS62250211A - Method for melt spinning - Google Patents

Abstract

PURPOSE:To prevent deterioration in yarn quality and reduction in handleability of yarn, by setting an ionic air blower in the vicinity of the lower part of a spinneret of melt spinning and carrying out melt spinning while blowing ionic air of anode and cathode on spun yarn from the blower. CONSTITUTION:A raw material for melt spinning consisting of a polymer such as polyester, polyamide, etc., is spun from a melt spinning spinneret 3. Ionic air of anode and cathode is alternately blown on prepared spun yarn from an ionic air blower 8 set in the vicinity of the lower part of the spinneret 3, the yarn 4 and the spinneret 3 are neutralized, the yarn is taken-up by an ejector, etc., deterioration in yarn quality and reduction in yarn quality and in yarn forming properties resulting from friction charge between the yarn and the spinneret in spinning are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a melt spinning method for polymers such as polyester and polyamide, and general fibers such as pitch-based carbon fibers and glass fibers.

(Prior Art and its Problems) An example of an apparatus used in a conventional melt spinning method is shown in FIG. 3 as a partial cross-sectional view. In the figure, a molten raw material (polymer, etc.) supplied to a spinning device 1 is filtered by a filter 2, and then spun through a spinning hole (not shown) of a spinneret 3 to become a yarn 4, which is then passed through a heating tube 5. It passes through the inner space and is drawn downwards in the figure.

By the way, in recent years, the spinning speed has increased and the take-up speed of the yarn 4 has also become considerably high (X), so the friction between the yarn 4 and the spindle 3 during spinning has become large. .And, due to the above +!J!*, both the yarn 4 and the cap 3 are strongly triboelectrically charged.The magnitude of the triboelectricity generated in this way depends on the raw material and the additives in the raw material. , due to the frictional charging characteristics with the base material.

Then, dirt such as dust, decomposed gas, and gaseous monomers that have accumulated in the atmosphere below the cap 3 are electrostatically attracted to the yarn 4, which deteriorates the quality of the yarn 4 and causes damage to the yarn 4. There is a problem that the handling property of the process is reduced. On the other hand, the above-mentioned dust, decomposed gas, and gaseous monomer are electrostatically attracted to the nozzle 3, causing clogging, reducing the spinnability of the yarn 4, and causing yarn breakage and deterioration of the spinning performance. is occurring.

(Objective of the Invention) The present invention is intended to overcome the above-mentioned problems in the prior art, including deterioration of yarn quality due to frictional electrification between the yarn and spindle during spinning, deterioration of yarn handling properties, and poor spinning performance. It is an object of the present invention to provide a melt spinning method that can prevent a decrease in .

(Means for Achieving the Object) In order to achieve the above-mentioned object, in the present invention, an ion wind supply device is provided near the bottom of the spinning die, and the ion wind of the positive electrode and the negative electrode is supplied from the ion wind supply device. Melt spinning is performed while spraying near the spinneret.

(Example) FIG. 1 is a partial sectional view of a melt spinning apparatus used in an example of the present invention. In the same figure, this device iio has
A hollow annular ion wind supply device 8 surrounding the space below the spinneret 3 is provided on the lower surfaces of the spin block 6 and the pack body 7.
(described later) is provided, and a hollow annular air suction device @9 is attached to the lower part thereof. A heating cylinder 5 similar to the conventional one is disposed below this air suction device 9.

FIG. 2 is a cutaway perspective view showing details of the ion wind supply device 8. As shown in FIG. As shown in the figure, this ion wind supply device 8
Now, a conducting wire 12 is attached to the inner peripheral surface 13 of the hollow annular duct 11.
are arranged in a ring.

A plurality of discharge needles 14 are connected to this conductor 12 at equal intervals over the entire circumference of the inner circumferential surface 13, and these discharge needles 14 extend in the direction of the annular axis of the duct 11. It extends in the direction of.

Further, the above-mentioned 111i112 is connected to an external power source 16 by a lead wire 15.

On the other hand, on the inner peripheral surface 13, near the position where the conducting wire 12 is disposed, a plurality of air outlet ports 17 communicating with the ventilation path 18 in the duct 11 are provided over the entire circumference of the inner peripheral surface 13. They are placed at equal intervals. By supplying compressed air from an air supply port 19 provided on the outer peripheral surface of the duct 11, air is blown out from these air blowoff ports 17.

On the other hand, the air suction device @9 shown in FIG. 1 has an annular slit-shaped air suction port 22 on the inner circumference of a duct 21 having a buffer wall 20 inside. Then, by sucking air from the external suction port 23 provided on the outer periphery of the duct 21 through a filter or the like using a vacuum pump (not shown), air is sucked from the air suction port 22 into the space near the bottom of the base 3. It sucks in air and exhausts it to the outside.

Next, the operation of the apparatus shown in FIG. 1 will be explained. In this apparatus 10, the supply of a molten raw material such as a polymer, the spinning from the spinneret 3, and the taking-off of the yarn 4 from a taking-off device (such as an ejector) not shown are performed in the same manner as in conventional apparatuses. While performing this spinning process, a second
While supplying power from the external power supply 16 shown in the figure, the air supply port 1
When compressed air is supplied from 9, a corona discharge occurs from the discharge needle 14, and the air blown from the air outlet 17 is ionized by this corona discharge. Therefore, the ion wind thus obtained is blown onto the lower surface of the cap 3 and the yarn 4 present at the bottom of the cap 3 as shown by the broken line arrow A.

In this operation, the supply voltage from the external power supply 16 is
When switched periodically between the positive and negative electrodes, the ion wind supply device 8 alternately supplies positive and negative ions, but if the switching cycle is shortened to a certain extent, the ion wind supply device 8 supplies positive and negative ions, respectively. An ion wind containing a mixture of ions is blown onto these caps 3 and threads 4. Therefore, l at the time of spinning! ! If the cap 3 is positively charged and the thread 4 is negatively charged by rubbing, the cap 3 is electrically neutralized by the negative electrode ions, and the thread 4 is neutralized by the positive electrode ions. Therefore, the electrostatic adsorption of gaseous monomers, dust, etc. due to the charging of the cap 3 and the thread 4 is eliminated. The same applies to the case where the charging polarity of the cap 3 and the thread 4 is opposite to that described above.

Incidentally, in this embodiment, air suction by the air suction device 9 is also performed in parallel with the above-mentioned ion wind blowing operation. Therefore, gaseous monomers, dust, etc. liberated by the neutralization operation are sucked together with air along the flow shown by the broken line arrow B, and are discharged to the outside from the external suction port 23. Therefore, these gaseous monomers and the like will not adhere to the cap 3 or the yarn 4 again. Moreover, the vertical relationship of the arrangement of the air suction device 9 and the ion wind supply device 8 may be reversed.

In the above embodiment, the voltage supplied from the external power supply 16 is switched over time between the positive electrode and the negative electrode, but the positive electrode ion wind supply device and the negative electrode ion wind supply device are provided independently, and the positive electrode ion wind The spraying may be carried out in a mixture of negative electrode ion wind and negative electrode ion wind. Further, it is not necessary to generate the ion wind itself near the bottom of the cap, and the ion wind generated at a certain distance may be guided to the vicinity of the bottom of the cap and supplied from there.

(Effects of the Invention) As explained above, according to the present invention, the charge between the spinneret and the yarn is electrically neutralized by blowing the ion wind of the positive electrode and the negative electrode. It is possible to obtain a melt-spinning method that can prevent deterioration of yarn quality due to charging, deterioration of yarn handling properties in post-processes, and deterioration of yarn spinning properties.

[Brief explanation of drawings]

Figure 1 shows the melt-spun ti used in one embodiment of this invention.
FIG. 2 is a cutaway perspective view showing an example of an ion wind supply device, and FIG. 3 is a partial sectional view of a device used in a conventional melt spinning method. 1.10... Melt spinning device, 3... Spinneret, 8...
...Ionic wind supply device, 9...Air suction device, 14
...discharge needle

Claims (1)

[Claims] An ion wind supply device is installed near the bottom of the melt spinning nozzle,
A melt spinning method comprising performing melt spinning while blowing positive and negative ion winds from the ion wind supply device to the vicinity of the lower surface of the spinneret.