JPS59187611A - Apparatus for spinning and drawing synthetic fiber usable for multiple purpose - Google Patents

Abstract

PURPOSE:The titled apparatus, having lower limit values of usable number of revolutions of the respective rolls and usable range of a winding device set below spin drawing conditions and upper limit values above the high-speed spin drawing conditions, and suitable for even diversified small-quantity production. CONSTITUTION:An apparatus having the respective variable frequency power source devices 9-13 for converting the frequency by leading electric power from a power source 15 thereto and feeding the electric power at the converted frequency to synchronous motors 1',3',4',5' and 6' for driving godet rolls 1,3,4, 5 and 6 and high-speed winder 7. A pretension roll 1 is formed into Nelson rolls with a separate roll 2, and a pair of godet rolls 3 and 3' are formed into Nelson rolls. The peripheral speeds of both are variable within a wider range than 700- 1,800m/min. Godet rolls 4,4,5,5,6 and 6 are formed into Nelson rolls, and the peripheral speeds thereof or winding speed of the high-speed winder 7 is variable within a wider range than 3,000-4,500m/min. A noncontact device for fixing the drawing point 8 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic fiber spinning and drawing apparatus that can be used for multiple purposes.

BACKGROUND ART In recent years, the technology of producing synthetic fibers, particularly high-strength yarns of polyester and nylon, by the spin-draw method has rapidly become popular as a production device due to its economical advantages.

Nowadays, various improvements have been made to the spin-draw method for producing high-strength synthetic fibers (for example, as disclosed in Japanese Unexamined Patent Publication No. 56-20606), and it appears to have been almost completed as a manufacturing device.

However, in recent years, high-strength synthetic fibers that are completely different from the conventional concept of high-strength synthetic fibers have emerged, and we are now faced with the middle ground of not being able to manufacture them using conventional spin-draw equipment, which seems to have been perfected.

Here, the basic concept regarding the manufacturing method of high-strength synthetic fibers will be briefly explained. For conventional quasi-crystalline high-strength synthetic fibers, it is important to keep the birefringence value of undrawn yarns as low as possible in order to increase the strength of the drawn fibers. For this purpose, a heating tube is provided under the spinneret (for example,
(No. Publication), etc., have been devised. In this production method, high-speed spinning was impossible due to the limitation of spinning speed, which is the most controlling factor for the birefringence of undrawn yarn, and the maximum spinning speed was about 700 m/i at most. Since the stretching ratio is approximately 5 times, high-strength yarns used in conventional tire cords do not require winding at high speeds of 3,500 m/cm or more; in fact, winding machines used for tire fibers Many of the products that were introduced into the world had an upper limit of 3500m/m.

On the other hand, the high-strength synthetic fiber based on a new concept is a high-strength yarn characterized by extremely low shrinkage, as the inventors have already clarified.
No. 29). The basic concept regarding the production of the fiber is that it is important to make the birefringence value of the undrawn yarn as high as possible in order to reduce the substantial heat loss of the fiber after drawing. Therefore, as mentioned above, the largest controlling factor for the birefringence value of undrawn yarn is the spinning speed, which is in direct conflict with the prior art in terms of the spinning speed, which is the basic manufacturing condition. The spinning speed of the fiber needs to be 1500 m/W or more (preferably 2000 m/W or more). Naturally, it is desirable that the fiber be manufactured by the spin-draw method, which is highly economical.
Since the stretching ratio is 2.5 to 3.0 times, the winding speed by spin draw method is 4000 to 6000 m/gi
n, which is extremely high speed.

The above is a general overview of manufacturing methods, but since products depend on the market, we will take a look at recent market trends for synthetic fibers, particularly high-strength yarns such as polyester and nylon. Japan's position in this area is extremely unstable. In other words, for polyester high-strength yarn, we have made advance capital investments based on recent domestic demand forecasts.

The growth in actual demand has far exceeded expectations, resulting in an excessive supply penalty, which is an extremely worrying situation. In addition, in the case of nylon high-strength yarn, the overseas market, especially the Southeast Asian market, is busy, and Japan's market share has fallen sharply due to the aggressive attacks of competing countries with low labor costs.The balance between supply and demand has been disrupted, and the situation is as extreme as that of polyester high-strength yarn. It's serious.

Considering the above historical background, it is predicted that the future production pattern for high-strength synthetic fibers will have to be high-mix, low-volume production. Based on these predictions, we conducted extensive research into the technology for producing synthetic fibers, especially high-strength fibers such as polyester and nylon, using the spin-draw method.As a result, we have developed the present invention, which can be used for multiple purposes with low capital investment and excellent economic efficiency. He came to invent a spinning and drawing device for synthetic fibers.

That is, 1 the present invention provides the following (1) to (5) along the yarn traveling direction.
This is a synthetic fiber spinning and drawing device that can be used for a variety of purposes, and is characterized by having the following components.

(1) A pair of Nelson rolls that apply preliminary tension to the yarn immediately after spinning prior to main drawing, and a wide peripheral speed variable range of at least 700 to 1800 m1w1n (2) Variable A first godet roll (3), which is a pair of Nelson rolls driven by a motor directly connected to a frequency power supply device and has a variable circumferential speed range of at least 700 to 1800 m/i without bringing the yarn into contact with a solid surface. Non-contact stretching point fixing device for fixing the stretching point (4) Two or more pairs of Nelson rolls each driven by a motor directly connected to a separate variable frequency power supply, each having a variable circumferential speed range of at least 3000 to 4500 m.
5) Winding speed variable range is at least 3000 to 450
High-speed winder wider than 0 m/m The basic mechanism of a synthetic fiber spinning and drawing device that operates at high speed is to process yarn continuously at high speed through circular motion. Therefore, for parts that are forced to move circularly in a small radius due to space constraints of the equipment, such as the roller pail of a winding machine, there is a problem with the primary and secondary critical speeds and rotational speeds caused by the resonance of the rotating body. (For example, Katsumi Hase, 6- "Lecture on the Current Status and Future of Ultra-High Speed Spinning," Abstracts P26, Institute of Textile Science, December 9-10, 1981) The current situation is that

In view of this, the present inventors have set the upper and lower limits of the machine specs of the spinning/drawing device to the spin draw conditions operated at a relatively low speed to obtain high toughness and high strength yarn using the conventional technology and the new technology. It is worth recalling that by designing a spin draw machine that is suitable for ultra-high speed operation to obtain low-shrinkage, high-strength yarn, a spinning and drawing device that can be used for multiple purposes and is suitable for high-mix, low-volume production can be obtained. It's arrived.

Under the high-speed spin draw conditions of the present invention, the yarn is drawn at an extremely high speed. Therefore, the drawing tension based on the tension difference using friction on the solid surface of a roller or the like is insufficient as the drawing tension becomes significantly high according to the experimental results of the present inventors. If an attempt is made to obtain a yarn strength of 100%, the cutting tension of the yarn will be exceeded and the yarn will break, which is inappropriate.

Therefore, in the apparatus of the present invention, a non-contact stretching point fixing device such as a jet using high-temperature steam or inert gas or a stretching device using high-power laser light is provided at least in the main stretching section of the first stage. It is characterized by

The front part of the spinning/drawing apparatus of the present invention is comprised of a group of a plurality of rollers that continuously carry out spinning and drawing. The lower limit of the number of rotations that can be used for each roller is less than or equal to the low speed spin draw condition, and the upper limit value is greater than or equal to the high speed spin draw condition. Furthermore, the lower limit of the usable range of the winding device is less than or equal to the winding speed of low-speed spin draw, and the upper limit of the usable range of the winding device is greater than or equal to the winding speed of high-speed spin draw. Note that under high-speed spin-draw conditions, the spinning tension increases significantly, so there is no need for a britension roll to provide preliminary tension prior to main drawing, but this device also satisfies the low-speed spin-draw conditions. 01
? An essential component is a tension roll that provides a pretension between /d and 0.2 Or/d.

Hereinafter, the present invention will be explained in more detail using the drawings. It goes without saying that the present invention is not limited to the following embodiments as long as the objects of the present invention are substantially achieved.

FIG. 1 shows a typical spinning and drawing apparatus of the present invention.

FIG. 2 shows the arrangement of the stretching rolls.

Power from the power source 15 to each variable frequency power supply 9.10
, 11. 12 and 13 for frequency conversion and driving each godet roll 1, 3, 4.5.6.
', 3', 4', 5', 6' and the high speed winder 7.

The tension roll 1 is a Nelson roll equipped with a separator roll 2, and since the take-up tension of the spun yarn is high under high-speed spin draw conditions, for example,
Unlike the device described in the No. 1002 publication, a britension roll is not necessary, but the device of the present invention needs to satisfy low-speed spin-draw conditions, so the britension roll group 1.2? -1: Important component. 0.01ri/
d~0.20? A method of providing a pretension of /d is usually to supply power of the same frequency from the same variable frequency power supply as the synchronous motor 3' of the first godet roll to the synchronous motor 1' of the pretension port 9-1. The cheapest method is to create tension in the yarn by making the tension roll straightness i 0.05% to 0.50% smaller than the diameter of the first godet roll to give a difference in roller circumferential speed. Of course, the present invention does not preclude changing the number of poles of the synchronous motor between 1' and 31 to make the roller diameter and the number of poles proportional. Also the first
The present invention does not preclude driving the synchronous type ftl[+3' of the godet roll and the synchronous motor of the retention roll using separate variable frequency power supplies to generate a difference in roller circumferential speed.

Furthermore, the present invention does not preclude driving the separator roll 2 of the retention roll group with a synchronous motor.

The circumferential speed variable range of the first godet roll 3 and the retention roll 1 is at least 700 to 1800 m/s
It is preferable that the upper and lower limits are variable over this range. The first godet roll is preferably a roll having substantially no heating device for the purpose of manufacturing the device at low cost.

Under the high-speed spin draw conditions used in the apparatus of the present invention, the yarn is drawn at an extremely high speed. Therefore, if an attempt is made to obtain sufficient yarn strength, the cutting tension of the yarn will be exceeded and the drawn yarn will break, which is inappropriate.

Therefore, in the present invention, the first godet roll 3 and the second
A non-contact stretching point fixing device 8 is used between the godet roll 4 and the godet roll 4. The non-contact stretching point fixing device generally uses a jet of heated steam, but a gas other than steam, particularly preferably an inert gas, may also be used. Furthermore, as a new method, a high-power laser may be used.

The second godet roll 4 is a main stretching roll.

The circumferential speed variable range of the roll is at least 3000 to 450
0 m/m and is preferably variable over a wider range than the lower and upper limits of this region.

Further, it is preferable that the roll 4 is a heated roll.

The third godet roll 5 is a double stretching roll, and the circumferential speed variable area of the roll is at least 3000 to 4500 m/
sin and is preferably variable over a wider range than the lower and upper limits of this region. Further, it is preferable that the roll is also a heated roll. The roll can be used as a double draw roll when extremely high strength fibers are required, and also as a heat fixing device when extremely low shrinkage fibers are required. In addition, as in another embodiment of the present invention shown in FIG.
It is also possible to omit the godet roll 5.

After the yarn is drawn under the high-speed spin draw conditions of the present invention, if it is wound up by the winding machine 7 without being shrunk using a group of rolls, the residual stress in the yarn causes the winding of the yarn winding paper tube to tighten. Since the paper tube cannot be removed from the chuck, it is necessary to provide a fourth godet roll 6 as a relaxation roll. The circumferential speed variable range of the roll is at least 3000
~4500 m/m, preferably variable over a wider range than the lower and upper limits of this range. This roll may or may not be a heated roll.

The winding machine 7 may be of any system, but the winding speed variable range should be at least 3000 to 4500 m/m.
It is preferable that it is variable over a wider range than this range. As this winding machine, a high-speed wine goo with an automatic switching mechanism is particularly desirable.

FIGS. 4 and 5 show another arrangement of the spinning and drawing roll group of the present invention. Other methods of arranging the roll group can be considered, and any form of arrangement may be used as long as the method of the present invention can be realized.

Next, a method of operating the spinning and drawing apparatus of the present invention will be described.

A polymer for melt spinning is melted by an extruder 20, and is melt-spun using a gear pump 19 from a spinneret (not shown) built in a spinneret puncture 18. The spun yarn F is cooled and solidified in the cooling chamber 17, and then transferred to the spinning tube 1.
Applying spinning oil with an oiling roller 14 through 6,
After that, it is made to run to the retention roll 1. The yarn is wound around the Britain tension roll 1 and the separator roll 2 multiple times, then around the first godet rolls 3, 3 multiple times, and then wrapped around the second godet rolls 4, 4, the third godet rolls 5, 5, the fourth godet rolls 6. After winding the winder several times in sequence, the winder is guided to a high-speed winder 7 and wound. In this case, the yarn F is pretensioned between the pretension rolls 1 and 1 and the godet rolls 3.3, and then subjected to main drawing between the first godet rolls 3.3 and the second godet rolls 4, 4.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing a typical example of the spinning and drawing apparatus of the present invention, FIG. 2 is a front view showing the roll portion of the apparatus shown in FIG. 1, and FIGS. It is a front view which shows the roll part similar to FIG. 2 which shows another example of a spinning drawing apparatus. 1... Fritension roll 3... First godet roll 4... Second godet roll 5... Third godet roll 6... Fourth godet roll 7...High-speed winder 8...Non-contact stretching point fixing device 9-13...Variable frequency power supply device 1', 3',
4', 5', 6'...Synchronous motor 14...
... Oiling rollers 14-15 ... Power source 16 ... Spinning tube 17 ... Cooling chamber 18 ... Spinneret pack 19 ... ... Gear pump 20 ... Extruder F ... Spun yarn patent applicant Toyobo Betcord Co., Ltd. 15- No. +I! 1 Figure 2 Figure 3 jJ4 Figure 51!1 Procedural amendment (spontaneous) June 8, 1980 Director of the Patent Office Kazuo Wakasugi Patent Application No. 59717a of 1988 Name of invention Can be used for multiple purposes Spinning and drawing device for synthetic fibers & Relationship with the case of the person making the amendment Patent applicant postal code 530 No. 2-2-8 Dojimahama, Kita-ku, Osaka City Detailed description of the invention in the specification Column Contents of the amendment (1) Insert the following sentence between the fourth and fifth lines of page 14 of the specification. ``Comparing the amount of polymer discharged when yarn of the same denier is obtained under high-speed spin-draw conditions and low-speed spin-draw conditions, the amount of polymer discharged under high-speed spin-draw conditions is about twice that of the case under low-speed spin-draw conditions. Generally, when melt-spinning a polymer such as polyester, which easily undergoes a depolymerization reaction at high temperatures, the spinning device is designed to shorten the polymer melt residence time as much as possible.The spinning and drawing device of the present invention In the case of 1, if the high-speed spindle condition and the low-speed spindle condition are the same number of threads, then the melt residence time under the low-speed spindle condition is the same as that of the high-speed spindle condition.
The condition becomes nearly twice as high, making it easy to cause deterioration of the polymer. Therefore, in the spinning/drawing apparatus of the present invention, it is desirable that the number of yarns is twice as many under the low-speed spin-draw condition as under the high-speed spin-draw condition, and the discharge amount under both conditions is approximately equal. To explain more specifically, under one low-speed spin draw condition, two or four yarns are drawn simultaneously with the same drawing roll (expressed as two-split spin draw and four-split spin draw, respectively), and under high-speed spin draw conditions, each By simultaneously drawing and winding one or two halves of yarn with the same drawing roll, the total amount of polymer discharged from the spinning device can be made approximately the same. ” 3-69-

Claims (1)

[Scope of Claims] 1. A synthetic fiber spinning and drawing device that can be used for multiple purposes and is characterized by having the following components (1) to (5) along the yarn traveling direction. (1) A pair of Nelson rolls that give preliminary tension to the yarn immediately after spinning prior to main drawing, and a fritension roll with a wide circumferential speed variable range of at least 700 to 1800 m/mix (2) Variable frequency With one Nelson roll driven by a motor connected directly to the power supply, the variable speed range is at least 700 to 1800 m/1.
Godetstrol (3) A non-contact abrasive drawing point fixing device that fixes the drawing point without bringing the yarn into contact with a solid surface (4) Two or more pairs of rollers each driven by a motor directly connected to a separate variable frequency power supply Nelson roll with a 5-peripheral speed variable range of at least 3000 to 4500 m
/ Proverbs wider than the second. 3rd... Godetstrol (5) Winding speed variable range is at least 3000 to 450
High speed winder wider than 0 m1Kin