JPS5976912A - Melt spinning apparatus - Google Patents

Abstract

PURPOSE:The titled apparatus, capable of discharging an atmosphere just under a spinneret to the outside of the system by an accompanying stream through a narrowed space for running a filament bundle under the surface of the spinneret and improving the spinning process conditions, and giving good fibers having small unevenness and good fiber quality. CONSTITUTION:A melt spinning apparatus having a spinning pack 1, delayed cooling part 7 of 40-200mm. length and forced cooling part 5 having a cooling air blowing surface in the order mentioned. The space of the delayed cooling part 7 is almost clogged by means of a spacer 6, having a hollow part (6C) capable of passing an extruded filament bundle (Y) therethrough, and provided at a position within 30mm. distance from the surface of a spinneret 2. The space for running the extruded filament bundle (Y) is narrowed by the surrounded spacer 6.

Description

[Detailed description of the invention] The present invention relates to melt spinning of a high molecular weight polymer σ).

It suppresses the generation and growth of foreign matter σ that accumulates around the nozzle of the spinneret, which is the underlying cause of poor performance in the spinning process, and improves the quality of the spinning process. This invention relates to a melt spinning device that produces good quality fibers.

During melt spinning of high molecular weight polymers, it has been observed that foreign matter accumulates around the nozzle of the spinneret over time, and it is well known that this is the main cause of deteriorating the quality of the spinning process. Chiru. For this reason, we regularly clean the spinneret surface or replace the spinneret to keep the spinning process in good condition. Loss etc.-1--
- is a considerable amount of money, and reducing the frequency of cleaning the spinneret surface and replacing the spinneret as much as possible has been an important issue for textile manufacturing engineers for a long time.

Conventionally, various methods have been proposed to suppress foreign matter deposited around the nozzle of a spinneret.

In particular, the mechanism of curing and growth of foreign substances in polymers whose main component is polyethylene terephthalate is still unknown, but analysis of the foreign substances reveals that they are mainly sublimable. It is known that the generation and growth of foreign matter deposited on the mouthpiece surface can be suppressed by discharging the atmosphere containing a large amount of cocoon matter to the outside of the system. From this point of view, methods have been proposed to exhaust the atmosphere directly under the mouthpiece surface by suctioning the atmosphere directly under the mouthpiece surface or by blowing gas from outside, but the polymer is still assimilated directly under the mouthpiece surface. Since it is in a non-fluid state, blowing or suctioning gas from the outside or giving it any disturbance is undesirable as it will cause uneven threads. Furthermore, if the atmosphere directly below the die surface is exhausted, the temperature directly below the die surface will drop, resulting in the resulting fibers having low strength and elongation, which is also undesirable from this point of view. In the conventionally proposed methods, it has been impossible to suppress foreign matter deposited on the spinneret surface, that is, to improve the quality of the spinning process, and to reduce yarn unevenness and improve yarn quality.

The present inventor has made a thorough study to reduce the amount of foreign matter deposited on the spinneret surface, improve the quality of the spinning process, and obtain fibers with good K, yarn unevenness, and yarn quality. In a melt-spinning apparatus in which a strongly suppressed cooling section is arranged at 11@ from the top, the delayed cooling section σ) 4 (diameter 40 to 200
Along with moth I, spindle filament east is formed in the nuclear dorsal cooling part.I
A spacer having a hollow portion that surrounds the spinneret in close proximity to the spinneret is disposed so that the upper end of the spacer is within 30 mm from the spinneret surface so as to substantially close the space of the dust and delayed cooling section. This is a melt spinning device.

Hereinafter, the present invention will be explained based on the drawings. 1 and 2 are a schematic perspective view and a longitudinal sectional view showing a specific example of the present invention. In the figure, l has a spinneret 2 for discharging molten polymer with a spinning pack arranged in a spin block 9. Reference numeral 2' denotes spinning holes arranged concentrically in the spinneret 2. Reference numeral 3 denotes a shutter for preventing yarn cooling air from flying up toward the tying nozzle surface and for securing a delayed cooling section.The shutter 3 has a yarn passage hole 3a and is divided into front and rear parts from the center thereof. 4 is a spinning tube that blows out yarn cooling air, and 5 is a yarn cooling chamber. Reference numeral 6 denotes a spacer according to the present invention, which is made of a metal body, and is composed of a split body 6m and 6b that is divided into two parts in the front and rear, similar to the shutter 3, and is connected to the spinning pack l and the yarn cooling chamber 5.
It has a hollow part 6c as a prefectural passageway formed in close proximity to and surrounding the Slowhata cooling 7, which is formed between It is designed to fill almost all of the space. A magnet 8 attracts and supports the spacer 6 to the lower surface of the spinning pack 1, and is attached to the spacer 6 directly or indirectly via an adhesive or a fixing means such as a bolt. In addition, 10 is a heat insulating material. In this 5TC device, the yarn Y discharged from the spinneret 2 travels through the space of the delayed cooling section 7 surrounded by the spacer 6, the shutter 3, etc., reaches the cooling chamber 5, and is blown out from the spinning tube 4. It is cooled and solidified by the cooling air. In this case, the delayed cooling 441 part 7 has an appropriate length of 40-=o in order to avoid yarn unevenness and produce fibers with good yarn quality.

We need a dragon. If the length is shorter than 40 m, the yarn unevenness will worsen and the fiber will have low strength and elongation, and if it is longer than 200 m, the fiber will have poor yarn unevenness.

In addition, the inner wall surface of the spacer 6 and the outermost periphery of the spinneret-2 (spinning)
The distance II from the hole 2' is measured as the distance projected on the horizontal plane, and is 15. be made below. As shown in the figure, when using a spinning tube in which cooling air is supplied from one direction, the yarn (bundle) Y is moved by the cooling air to the cooling air blowing surface 4.
Since it bends in the direction away from the spacer hollow part 6c, the distance between the inner wall surface of the spacer hollow part 6c and the outermost peripheral hole 2' of the spinneret 2 is on the side opposite to the cooling air blowing surface 4a<1. ) is 3 ohm or less, horizontal direction (
1-), it is preferable to make it as small as possible by 20 m or less.

The present invention effectively suppresses the generation and growth of foreign matter deposited on the spinneret surface as described above, and the reason for this is thought to be as follows.

The yarn polymer discharged from the spinneret 2 carries surrounding air downward as an accompanying flow in order to run itself. In the case of conventional spinning devices, which have a fairly wide space under the spinneret surface, most of the air exhausted by the accompanying flow is below the spinneret where the yarn travels at a high speed, and directly below the spinneret, the yarn travels at a much slower speed. Therefore, sufficient accompaniment flow is not generated, and the atmosphere containing a large amount of sublimate directly under the mouth surface remains stagnant. On the other hand, when the space under the spindle is substantially open only to the yarn running portion as in the present invention, the yarn accompanying flow mainly occurs in the region below the spindle surface where the yarn running speed is high. The atmosphere directly below the mouthpiece surface is also sucked and exhausted to the outside of the thread.

In other words, by narrowing the thread running space under the spindle surface to just enough space for the yarn bundle Y to pass through, it becomes possible to discharge the atmosphere directly below the spindle surface to the outside of the yarn by the accompanying flow, and therefore, one piece This makes it possible to suppress foreign matter deposited on the surface.

Therefore, in order to obtain the above effect, it is preferable that the distance between the inner wall surface of the spacer 6 and the yarn bundle Y be as narrow as possible, and as described above, this appropriate distance is approximately 15 mm on the cooling air blowing surface side. be made below. Also, it is preferable that the interface between the upper end surface of the spacer and the spinneret surface be as narrow as possible, and should be 30 degrees or less. If this value is exceeded, the ventilation effect will be lost and it will not be suitable for suppressing foreign matter adhesion.

Furthermore, in the present invention, the airflow is rectified by the yarn accompanying flow in the important area where the polymer directly under the mouth surface is in a fluid state, and there is no space other than the thread running space under the mouth surface. Since there is almost no unnecessary space, there is no disturbance of the atmosphere due to blowing up of cooling air from the forced cooling section in this part, which has the effect of reducing yarn unevenness.

Conventionally, when the atmosphere under the die surface is exhausted, the temperature of the atmosphere below the die surface decreases, and the strength and elongation of the fibers decreases.1. 'l There was a problem that yarn quality deteriorated, but in the present invention, the spacer 6 is installed in a high temperature atmosphere where there is heat radiation from the discharged polymer, spinning pack, spin block, etc. under the spinneret surface. 6 is heated to a high temperature, and the yarn is kept warm by the radiant heat effect during this time, so the strength and elongation of the fiber decreases →
In fact, it improves. Although it is preferable that the spacer according to the present invention uses scrap metal as its material, it is not necessarily limited to this. When using gold,
Among general-purpose materials, aluminum (aluminum-based material) is most preferable among general-purpose materials because it has a short time I when reaching a thermal equilibrium state after installation and has a large radiant heat effect. Furthermore, in order to shorten the time required to reach a thermal equilibrium state, it is preferable to reduce the heat capacity as much as possible, and for this purpose, it is preferable to use a hollow body using a plate as thin as possible. Various methods can be used to install the spacer, but it must be easily removable and fixed, and the most convenient means for this is to attach it to the bottom surface of the spinning bag using a magnet.

In this case, if the spacer is divided into two parts, one on the working surface side of the spinning machine and the other on the non-working surface side, only the working surface side of the spacer needs to be removed when cleaning the nozzle surface or observing the nozzle surface. This is preferable from the standpoint of improving workability.

Although the specific example shows the case where four yarns are spun simultaneously, it goes without saying that the present invention is not limited to this and can be similarly carried out when spinning one yarn or any number of yarns. Further, the shutter 3 may be large or integral with the pacer 6, and may even be removed without any acid. When the shutter 3 is ground as in this embodiment, it is preferable that the three thread passing holes are approximately the same size as the hollow portion of the spacer '6.

Next, examples will be shown to further specifically explain the effects of the present invention.

As shown in Examples 1 and 2, polyethylene terephthalate having an intrinsic viscosity (measured at 35°C in 0-chlorophenol) of 0635 was spun using a spinning device having a spinning tube from which cooling air was blown from one direction. Melt spinning was carried out at a speed of 1200 m/min to obtain a 50 denier/36 filament frame (measured after stretching). At this time, the spacer 6 was made with an annular material, and the hollow hole formed had an oval cross section, and its size was as shown in the table below (various different types were used. The results are shown in the table below). As shown.

The length of the delayed cooling section was 100 mm, the pin circle of the outermost hole of the spinneret was 50 mm, and the cooling air flow was 9 minutes.

Here, 4+4+mu is the distance between the inner wall surface of the spacer hollow hole and the outermost circumferential hole (inner wall surface) of the spinneret, tl is the cooling air blowing surface side, and kan is the side opposite to the cooling air blowing surface.

1 is the distance between the direction of the cooling air blowing surface and the right angle side (lateral side). d is the distance between the lower surface of the base and the upper surface of the spacer.

The spinning process condition is expressed as the average spinneret surface cleaning cycle (unit: days), in which the spinneret surface is cleaned when spinning yarn breakage occurs twice or more in 8 hours.

Yarn quality was measured using a drawn yarn, and dyeing spots were judged by the inner eye using a 5-point method, with a score of 3.5 or higher being a good level, but higher scores are preferable.

Further, a good level of u% is 0.7 inches or less, but the lower the u%, the better.

From the above results, t1≦15 and 4≦30.

It can be seen that installing a spacer with Am≦20 M and d≦30 significantly improves both the spinning condition, yarn unevenness (l, dyeing unevenness), and yarn quality (strength and elongation) compared to the conventional method.

The reason why the spinning process is in good condition is due to the spinneret nozzle (
It was confirmed from observation of the spinneret nozzle surface that this corresponds to a decrease in foreign matter accumulating around the spinning hole. It has also been confirmed that in the case of spinning devices ff and ffi that blow cooling air from all around the circumference, similarly good results can be obtained if the number of stones is 15 or less.

As described in detail above, according to the present invention, the generation and growth of foreign substances deposited around the nozzle of the spinneret are suppressed, and the spinning process PJ
It is possible to improve the M density and to stably obtain fibers with good yarn unevenness and yarn quality.

In addition, it can be said to be an innovative melt-spinning facility in that it satisfies both the suppression of foreign matter deposited on the spinneret surface and the improvement of yarn unevenness and yarn quality, which were conventionally considered contradictory phenomena.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a schematic perspective view and a longitudinal sectional view showing an embodiment of the present invention. 1... Spinning puncture, 2... Spinneret, 2'... Outermost peripheral hole 3... Shutter, 4... Spinning tube, 6.
...Spacer 6C...Hollow part, 7...Delayed cooling part, 8...Magnet procedure amendment Showa, evening? Date of 2015/2017, Mr. Commissioner of the Japan Patent Office 1, Indication of Case Patent Application No. 57-184452 No. 28 Name of Invention Melt Spinning Apparatus 3 Person Making Amendment Relationship to Case Patent Applicant 1-11 Minamihonmachi, Higashi-ku, Osaka City (300) Teijin Co., Ltd. Representative Tomo Tokusue Teijin Co., Ltd. Internal ii1' 411 yj &, tyl d) 1!6
Contents of amendment (1) The claims are amended as shown in the attached sheet. (2) In page 6, line 7 of the specification, the phrase "near 1" is amended to "near yarn bundle YK". (3) On page 8, line 13, the phrase "outside the thread" is corrected to "outside the system." (4) In the second line of page 12, correct the words "pi-en" and "pitch-en" to "pitch-en." (5) mHIE page 14, line 15, rg'J,! −
There is r7! Correct to IJ. Attached Claim 1: In a melt spinning apparatus in which a spinneret pack, a delayed cooling section, and a forced cooling section having a cooling air blowing surface are arranged in order from the top, the length of the delayed cooling section is set to 40 to 200 mm. A spacer having a hollow portion that surrounds the delayed cooling section so that the spun yarn bundle can pass through the delayed cooling section is provided so that the upper end of the spacer is located within 30 mm from the spinneret surface and the space of the delayed cooling section is 1. A melt spinning apparatus characterized in that the apparatus is arranged so as to close the t. 2. The melt spinning apparatus according to claim 1, wherein the spacer is constituted by a hollow body made of aluminum. 3. The melt spinning apparatus according to claim 1 or 2, wherein the spacer is attached via a magnet provided on the spacer. 4. Claim 1, wherein the forced cooling section has a blowing surface that supplies cooling air from one direction. The melt spinning apparatus according to item 2 or 3. 5 The hollow part of the spacer for thread passage is oval and the horizontal distance between it and the outermost peripheral hole of the thread cap is 15 #Im or less on the cooling air blowing surface side, and 30@IR or less on the side opposite to the cooling air blowing surface. 5. The melt spinning apparatus according to claim 4, wherein the diameter is 20 angles or less on the side perpendicular to the blowing direction of the cooling air. 6. Claim 941, wherein the forced cooling section has a blowing surface that supplies cooling air from all around the circumference. The melt-spinning apparatus according to claim 2 or 3, 7. A patent claim in which the hollow part for thread passage of the spacer is circular, and the horizontal distance between the inner wall surface thereof and the outermost peripheral hole of the spinneret is 15n or less. The melt spinning apparatus according to item 6.

Claims (1)

[Claims] 1. A melt-spinning apparatus in which a forced cooling section having a gold puncture, a delayed cooling section, and a cooling air blowing surface is arranged in order from the top, the length of the delayed cooling section is 40 to 200 m, and A spacer having a hollow portion surrounding the spreading cooling section so that the spun yarn bundle can pass therethrough is provided, and the upper end of the spacer is located within 30 W from the spinneret surface and almost blocks the space of the delayed cooling section. 2. The melt spinning device according to claim 1, wherein the spacer is constituted by a hollow body made of aluminum. 3. The spacer is attached to a magnet provided on the spacer. Through
Melt spinning apparatus # according to claim 1 or 2. 4 The forced cooling section has a blowing surface that supplies cooling air from one direction. The melt spinning apparatus according to claim 2 or 3. 5 For passing the spacer threads. The middle part has an oval shape, and the horizontal 1/NM between the thread cap and the outermost hole is 15 am or less on the cooling air blowing surface side, 30 am or less on the opposite side to the cooling air blowing surface, and in the cooling air blowing direction. The bath melt spinning according to claim 4, wherein the diameter is 20 or less on orthogonal sides. 6. The forced co-cooling section has a blowing direction that supplies cooling air from all around the circumference. The melt spinning apparatus according to item 2 or 3. 7 Spacer yarn] [The hollow part to which the spacer is applied is circular and the horizontal distance between its inner wall and the outermost hole of the spinneret and σ is 1.
5. The melt spinning apparatus according to paragraph 6 of the patent claim, which has an infrared range of 5 or less.