JPS60259613A - Preparation of thermoplastic synthetic yarn - Google Patents

Abstract

PURPOSE:To obtain yarn having high strength by one process, by extruding a polymer from a spinneret into a spinning column of pressurized atmosphere set directly under it, solidifying it under cooling, pulling out the solidified polymer from the spinning column, drawing it under heating in a normal-pressure atmosphere. CONSTITUTION:A thermoplastic polymer capable of being subjected to melt spinning is extruded in a molten state from the spinneret 7 into the spinning column S of pressurized atmosphere set directly under it, cooled and solidified, and pulled out from the sealing part 24 at the bottom of the spinning column S to an atmosphere at normal pressure. Then, the polymer is introduced into the heating column 35 and drawing under heating. It is pulled by the godet rollers 30a and 30b, and wound around the winder 33. When the polymer has high melt viscosity, preferably the heating column 8 is set at the outer periphery directly under the spinneret 7. Preferably the pressure in the spinning column S is >=1kg/cm<2>, preferably >=3kg/cm<2> higher than normal pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for producing thermoplastic synthetic fibers. More specifically, the present invention relates to a method for manufacturing high-strength yarn at low cost using only one spinning step.

[Prior art and its problems]

Conventionally, thermoplastic synthetic fibers are generally produced by melting a thermoplastic polymer, spinning it out from a spinneret, cooling and solidifying it to obtain a low-oriented undrawn yarn, and then drawing the undrawn yarn under heating. It is manufactured by creating drawn yarn with practical mechanical properties.

In recent years, such manufacturing methods have not been able to reduce costs or save labor.

A typical example of such an energy-saving and cost-reducing process is a direct spinning/drawing (hereinafter abbreviated as DSD method) process in which spinning and drawing are directly connected. However, this D
The SD method uses rollers that rotate at high temperatures and high speeds for stretching, so it has poor energy efficiency and has the disadvantage that it cannot achieve large cost reduction effects.

On the other hand, as disclosed in Japanese Patent Publication No. 35-5104, an attempt was made to obtain yarn of practical quality only in the spinning process by taking the yarn discharged from the spinneret at high speed (hereinafter referred to as (abbreviated as high-speed spinning method). Although this method has a large cost reduction effect, the resulting fibers have a special internal structure and generally only yarns with poor mechanical properties can be obtained.

On the other hand, Japanese Patent Publication No. 45-1932 describes a method in which the yarn discharged from the spinneret is cooled and solidified, and then made to run through a heating zone again to achieve heating drawing.
J) Law (abbreviated as "law") has been fully disclosed.

By such a method it is possible to produce silk at relatively low cost. Since the mechanical properties are close to conventional drawn yarns to some extent, the cost is 2゛7 blocks 1.
This method is considered to be the most effective method for one process. However, in recent years, there has been a demand to further improve the mechanical properties of the yarn obtained by such a cost-down process.

As an alternative approach to increasing the strength of the yarn obtained by such a method of obtaining practical fibers using only one spinning process, there is, for example, Japanese Patent Publication No. 47-62130. That is, the molten polymer is spun at a high spinning speed into a pressurized chamber directly below the spinneret, cooled and solidified, and then the yarn is ejected with high-speed pressurized gas from a nozzle at the bottom of the pressurized chamber. A method for obtaining drawn yarns in one go is disclosed. However, this method aims to obtain drawn yarn as a material for non-woven fabrics, webs, etc., and since it is sent out at high speed mainly using the accompanying force of air, it is difficult to manipulate the yarn, that is, the speed of the yarn, the drawing force, the drawing ratio, etc. It is difficult to control the mechanical properties of the yarn, and the mechanical properties of the yarn are not as high as desired. Furthermore, Japanese Patent Application Laid-open No. 178030/1983 discloses a method in which a filament is cooled and solidified, passed through a tension zone, and further introduced into a heating zone to increase the strength. Rubbing of the yarn by a guide is used as the tension zone for overcasting, but such a method damages the yarn and is not suitable.

Furthermore, JP-A-54-120733 discloses a method in which the yarn is cooled using cooling air at 35°Cυ± and then passed through a heating zone. The range of mechanical properties is small, and high-temperature cooling air is used in operation, making it difficult to operate.

[Purpose of the invention]

As described in detail, in the conventional method, it is impossible to obtain high-strength yarn at low cost with only one spinning step.

An object of the present invention is to provide a novel melt-spinning method for obtaining yarns with higher strength from conventionally proposed low-cost manufacturing processes.

[Structure of the invention]

That is, in the present invention, a thermoplastic polymer that can be melt-spun is discharged into a pressurized atmosphere spinning tube that is provided directly below the spinning tube 1 and is maintained at a higher pressure than the external atmosphere, and is then cooled and solidified. from the outlet of the spinneret, which is sufficiently fluidly connected to the spinneret.

The synthetic fiber is characterized in that after the yarn is forced to advance outside the spinning/v8 cylinder, the yarn is made to run through a heating zone again, the yarn is heated and drawn in the heating zone, and then taken off by a take-off means. This is a manufacturing method.

The present invention will be explained in more detail below.

In the present invention, the thermoplastic polymer is discharged into a pressurized atmosphere spinning tube provided directly below the spinneret and maintained at a higher pressure than the normal pressure part of the outside air, and is cooled and solidified, while the yarn is placed in the pressurized atmosphere. After running it, it is led out of the pressurized spinning cylinder,
It is important that the yarn is subsequently introduced into the heating zone again.

According to the research of the present inventors, in order to achieve high strength in the DSD method, it is necessary to increase the stress applied to the yarn in the region entering the heating zone and to rapidly cool the spun/spun yarn. It has been found that it has a significant effect. Here, as a specific means for increasing the stress in the yarn, it is necessary to take care to prevent damage to the yarn. For example, if a means such as abrasion by a yarn path guide or the like is adopted, the stress can be increased, but the generation of fuzz during spinning increases.

In order to rapidly cool the spun yarn without damaging the yarn and increasing the stress of the yarn, the yarn is discharged into a pressurized atmosphere, rapidly cooled, and while being cooled and solidified, the pressurized atmosphere is released. The method of running the vehicle is the easiest to realize in terms of operation and is also the most effective. The reason why it is possible to increase the stress caused by running the yarn in a pressurized atmosphere in this way is thought to be because the yarn is rapidly cooled in the pressurized atmosphere and the air resistance acting on the yarn increases.

Therefore, in the present invention, the yarn 1'' (
'k (T i + * 'k 'c, @, ?'n
A method is adopted in which the stress is increased by L=°·1, and then the yarn is introduced into the heating zone again to perform drawing.

Only by drawing under high stress in this way can yarns with higher strength than those obtained by conventional methods be obtained.

Furthermore, in the present invention, the yarn is run in a pressurized atmosphere, and then the yarn is pulled out from the pressurized atmosphere, and then introduced into the heating zone, as in the case of the pressurized atmosphere. The yarn is pulled out from the inside, and the 1' portion is substantially sufficiently fluidly 7-
It is necessary that the If the stiffness of the thread part is insufficient, the pressure in the pressurized atmosphere spinning tube will not increase sufficiently, and the pressure fluctuations in the pressurized atmosphere spinning tube will increase, which will affect the drawing effect of the yarn. This will have an adverse effect, and the uniformity of the resulting yarn will decrease.

Furthermore, another important point in the present invention is that the yarn is introduced into the heating zone after being led out of the pressurized atmosphere.

This is because by leading the yarn out of the pressurized atmosphere, the spinning-associated air current can be removed, the temperature drop in the heating zone can be suppressed, and the heat treatment efficiency can be improved.

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Then, it is introduced into a heating zone, and while being heated and stretched in the heating zone, it is taken off by a taking-off means.

In this way, the yarn is spun into the spinning tube with a pressurized atmosphere under the metal, rapidly cooled, and solidified by cooling.The yarn is then run through the pressurized atmosphere to reduce the stress on the yarn. After increasing the height of the yarn, the yarn is drawn out in the pressurized atmosphere, and then drawn and taken off in a heating zone. This makes it possible to produce high-strength yarn at low cost in a single step consisting of only the spinning process. This will be realized.

The heating zone of the present invention only needs to heat the space through which the yarn passes, and for example, a tube having a cylindrical shape or a rectangular cross section may be used, but is not limited thereto.

Father, such a heating zone heats the surroundings of the heating zone and increases the ambient temperature within the heating zone, while
It is preferable to actively introduce heated gas from the outside at a rate of 1/2 min because the yarn can be heat-treated uniformly. Further, the temperature of the heating gas and the atmospheric temperature d of the heating zone may be at least the glass transition temperature of the M combination, but preferably 100 to 300°C from the viewpoint of stabilizing the operation.

In addition to air, inert gas such as nitrogen or helium or water vapor can be used as the heating gas introduced into the heating zone; however, air is particularly preferable since it is less problematic during operation.

Furthermore, when introducing the heated gas into the heating zone, it is preferable to rectify the gas using a wire mesh filter, a non-woven fabric made of metal fibers, a sintered metal, etc. to improve uniformity.

Melt spinning applicable to the present invention, i': t-J functional p! A
The plastic polymers include poly-ε-capramide, polyhexamethylene adivamate, polyhexamethylene sebamate, polytetramethylene adipamito, polyhexamethylene terephthalamide, polyhexanothylene inophthalamide, and polyhexamethylene adipamide. Polyamides such as dotecanothylene dodecamito, polymethaquinoleno-adipamide, polyparaquinolylene adipamide, polyethylene teretuthalate, boritetetramethylene terentalate, bornoethylene 1.2- ) toenoquinethane P P'- Dicarboxylate, polyesters such as polynatsutalene thirefthalate-1, polyethylene,
Polyolefins such as polypropylene and polybutene-1, and ordinary melt-spun thermoplastic polymers such as polyfluorinated ethylene-polyvinylidene fluoride copolymer, polyvinyl chloride, polyvinylidene chloride, and polyacetal, each containing two types. This includes copolymerized polymers and mixed polymers.

Among the above-mentioned thermoplastic polymers, the effects of the present invention become more remarkable when polyesters are used in particular.

Furthermore, when the present invention is applied to thick polyester varieties with a single yarn denier of 5 deniers or more, the effect is remarkable.

In other words, in the case of thick products with a single yarn denier of 6 or more denier, in the conventional method, the stress applied to the yarn at the entrance of the heating zone was particularly small, and a sufficient spreading effect could not be obtained.
By applying the present invention, significant improvements in physical properties can be realized.

Further, the above-mentioned physical property-promoting effect becomes particularly noticeable when the take-up speed is 3000 m/min or more, which is preferable.

Further, from the viewpoints of operability, yarn threadability, spinning stability, etc., the take-up speed is preferably 4,000 to 8,000 m/7 minutes.

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

FIG. 1 is a schematic diagram showing a typical embodiment of the manufacturing method of the present invention.

In the figure, 1 is a spinning machine, and the spinning machine has a tip T
It consists of a raw material hono-knee'z into which is charged, a melt extruder 3, a metering pump 4, a motor 5 with a transmission, a pack 6, and a nozzle 7.

The chips T from the raw material hopper 2 are passed through the metering pump 4 in a polymer state by the melt extruder 6 in the spinning machine 1, and then passed through the filter (not shown) in the chic 6.
The polymer is filtered through a nozzle 7 and then melt-spun as yarn Y at a temperature in the range of usually above the melting point of the polymer and +100°C above the melting point.

The metering pump 4 is connected to a motor 5 with a transmission, and by controlling the rotation speed of the motor 5, the discharge amount of the yarn Y is determined. can be determined.

In the present invention, a pressurized atmosphere spinning tube S is provided directly below the bag 6 to which the spinneret 7 is attached, and a pressurized fluid is introduced into the spinning tube to maintain the inside of the spinning tube in a high pressure state. This is what I did.

The pressurized atmosphere spinning tube S will be described in more detail below.

A heating cylinder 8 is attached to the spinning machine 1 directly below the spinneret as necessary, and an annular chimney 12 of a pressurized cooling air blowing device is attached below the heating cylinder 8 via a heat insulating cylinder 11. . The heating cylinder 8 is used, for example, when melt-spinning industrial polymers with high melt viscosity, and may not be employed when melt-spinning low-viscosity polymers used for clothing.

Further, the heating cylinder 8 is provided with a thermocouple 9, and the thermocouple 9 is connected to a temperature controller 10 so that the atmospheric temperature within the heating cylinder can be controlled to a set value. The temperature controller 10 is configured to control a heater (not shown) built into the heating cylinder and to set the atmospheric temperature inside the heating cylinder to a set value. The temperature of the heating cylinder is usually within the range of -40°C, the melting point of the polymer, to +100°C, and a length of 5 cb degrees is sufficient for the length of the heating cylinder.

A cylindrical porous filter 13 is installed in the annular chimney 12, and the pressurized cooling air sent from the pressurized cooling air blowing pipe 14 that opens into the annular chimney 12 is filtered. The structure is such that the air is blown out almost uniformly in the longitudinal direction and the circumferential direction of 16. A valve 15 for adjusting the air volume is attached to the pressurized cooling air blowing pipe 14. 26 is a pressure gauge.

Below the annular chimney 12, a movable cylinder 17 is housed in a fixed cylinder 18, and the movable cylinder 17 is attached to the movable cylinder and interlocks with a cylinder 19 to operate the seven cylinders 19. This makes it possible to move up and down the inside of the fixed cylinder 18 in a unidirectional manner.

During operations such as threading, the movable cylinder 17 secures a working space between the lower end of the annular chimney 12 and the upper end of the movable cylinder 17, and during normal winding, the movable cylinder 17 secures a working space between the lower end of the annular chimney 12 and the upper end of the Chil
, the knee 12 is raised at position 1 and can be pressed against the knee 12.

In addition, the sliding part between the movable cylinder 17 and the fixed cylinder 18, the contact pressure part between the movable cylinder 17 and the annular chimney 12 (C is provided with a 7-ring member 16, 16' such as an O-ring, etc.). It has a leak-tight structure.

As shown in FIG. 2, the yarn exit portions at the lower ends of the fixed cylinders 1 and 8 have minute slits 28 that are large enough for the yarn to pass through, and the pressure loss at the slit portions substantially eliminates fluid flow. enough for /-
A guide holder 25 is attached with a seal guide 24 that ensures the safety (FIG. 2(A) shows a plan view, and FIG. 2(B) shows a side view). The knoll guide 24 only slightly leaks the airflow accompanying the yarn, and 4; i. The leakage of the airflow does not cause significant shaking of the yarn, and there is no entanglement between the yarns. .

A pressure gauge 27 and an exhaust pipe 23 are provided below the fixed cylinder 18, and the pipe 23 is connected to an outside atmospheric pressure section via a valve 22.

Therefore, the movable cylinder 17 is pressed against the annular chimney 12 ζ
A sealed space from directly below the cap 7 to the 7-rule guide 24 at the lower end of the fixed cylinder 18, that is, a pressurized atmosphere chamber S a'fr below the cap can be easily obtained by simply attaching the cap 7 to the guide 24 at the lower end of the fixed cylinder 18.

The outer wall of the fixed cylindrical body 18 is covered with a heat exchanger 29,
The structure is such that the atmospheric temperature in the pressurized atmosphere spinning chamber Sa is cooled by a refrigerant (not shown) flowing in the heat exchanger 29.

The lower mouth pressurized atmosphere chamber fEa can control the pressure and flow rate of the cooling air sent into the pressurized atmosphere chamber Sa by the valve 22 and the valve 15 provided at the inlet of the annular chimney 12. .

Now, the pressurized and sealed cap part is placed in the pressurized atmosphere pressure Sa.
When the melt-spun yarn Y is discharged from the heating tube 8, the yarn Y travels through a slow cooling area in the heating cylinder 8, which is maintained at a set temperature by the temperature control roller 10. It is cooled by pressurized gas (pressurized air in this example).

Further, while the thread Y travels within the fixed cylinder 18 covered with the movable cylinder 17 and the heat exchanger 29, cooling is promoted and solidified. After that, it passes through the sole guide 24 and is introduced into a heating zone 55 installed in an outside air normal pressure section, and after being hot-stretched within the heating zone, it is subsequently applied with a spinning oil by an oil supply device 21. Thereafter, the yarn Y is wound around the bobbin 34 of the winder 63 through the first godet roll 5081 which rotates at a constant circumferential speed, and further through the second godet roll 6b.

The rotation speed of the bobbin 54 of the winder 63 is determined by a tension detector 3 provided between the second godet roll 30b and the winder 64.
1, the winding tension of the yarn Y is detected, and controlled by the controller 32 so that the tension is approximately constant.

According to this embodiment, the amount of pressurized air flowing into the mouth lower pressurized atmosphere chamber Sa is controlled by the valve 15 provided at the inlet of the annular chimney 12, and by the valve 15 provided at the inlet of the annular chimney 12. By adjusting the amount of pressurized air flowing out from the pressurized atmosphere chamber Sa to the split-pressure dog air section using the valve 22, the flow is carried out in the running direction of the yarn Y while keeping the inside of the pressurized atmosphere chamber Sa in a constant pressurized state. It becomes possible to freely control the amount of pressurized cooling air flowing along the line.

In the embodiment shown in FIG. 1, air is used as the pressurized fluid, but any gas that is inert to the polymer, such as nitrogen or water vapor, may be used. In operation, air is preferable because it is the easiest to handle and is low cost, but the use of high-density gas or high-viscosity gas is advantageous because it can further increase the stress.

In addition, in order to make the effect of the present invention remarkable, the pressure inside the spinning cylinder is preferably set to 1 kz/cr1 or more, and 3 kz/cr1 or more.
/ca or more is even better. In the present invention, normal pressure (atmospheric pressure) is a pressure of oh/cM.

The heat exchanger that cools the atmospheric temperature in the pressurized atmosphere chamber Sa at the bottom of the nozzle is used to increase the temperature of the air in the pressurized atmosphere spinning cylinder due to heat exchange with the spun yarn, reducing the effect of cooling the yarn. However, as in this embodiment, the fixed cylinder 18
In addition to flowing a refrigerant through the outer wall of the pressurized atmosphere Sa, for example, means such as a heat vibrator may be used to directly cool the atmospheric temperature within the pressurized atmosphere Sa. Also, although not shown,
It is also possible to provide an air flow outlet separate from the annular chimney in the spinning tube near the yarn outlet. The airflow blowing section balances the pressurized fluid blown from the annular chimney,
Do this while maintaining the specified pressure.

The discharge amount is relatively small, and by dissipating heat through the outer wall of the spinning tube or actively cooling the outer wall of the spinning tube, the temperature of the air inside the spinning tube does not rise and the yarn is sufficiently cooled. If reached, the airflow outlet can be kept closed.

In this embodiment, the exhaust valve 22 is opened to flow pressurized cooling air into the pressurized atmosphere chamber Sa at the bottom of the base.
Although the heat exchanger 29 promotes cooling of the yarn Y, depending on the winding conditions, these are not necessarily necessary.

Further, in order to equalize the melt viscosity between the individual yarns Y discharged from the mouth surface of the 1'' metal 7, a heating tube 8 is installed, but depending on the conditions of the polymer, these are not necessarily necessary.

Further, FIG. 3 is a longitudinal sectional view of a heating cylinder showing an example of the heating zone 35 of the present invention. Yarn Y leaving the pressurized atmosphere spinning tube is '! It is heated by running around a heating cylinder 41 heated by an electric heater 44. A filter 43 for introducing heated air is provided in a part of the heating cylinder, and a heated gas supply section 42 is provided to surround the filter, and heated gas is introduced through the filter 43.

Regarding the method of introducing the heated gas, a filter type is shown, but the method is not limited to this.

Further, in FIG. 6, electric heating is illustrated as a means for maintaining the atmospheric temperature in the heating zone at a high temperature, but a heating medium heating method may also be used, and the present invention is not limited to these methods. 1 [Effects of the Invention] As described above, high strength can only be achieved by spinning a thermoplastic polymer in a pressurized atmosphere, increasing the stress on the yarn, and then introducing it into a heating zone. A wide range of yarn types can be manufactured at low cost.

The present invention is particularly effective in the production of polyester yarns with a single yarn denier of 6 or more deniers, which conventionally only had low strength yarns obtained by the approximately DSD method using a heating zone.

In addition, the drawn yarn obtained by this process has high strength and excellent uniformity, and has the characteristics that it can be applied to all fields where drawn yarn has traditionally been applied. The advantage is that it can be manufactured stably at low cost.

Hereinafter, the present invention will be explained in more detail with reference to Examples. The physical property values used in the Examples were measured by the method described below.

Nl Strength and elongation Sample length 2QQIW11. Bet the pulling speed 1oo,
The strength and elongation curve was calculated under the condition of 10 minutes.

(2) Uniformity (Worcester's mottling) Using a Noelberger Star mottling tester, yarn speed 25
The thickness unevenness in the fiber axis direction was measured under the conditions of m/min, range ±125%, and chart speed of 5 crn/min, and the U% value was determined.

(3) Intrinsic viscosity [l] Measurement is performed at 25°C using 0-chlorophenol as a solvent.

Example 1 Intrinsic viscosity [η] was determined using the spinning take-off device shown in Fig. 1.
0.63 polyethylene terephthalate was melt spun. Spinning temperature is polymer temperature 295℃, spinneret outer diameter + 0
0 wartφ, hole diameter 0.5 Mlφ, number of holes was 24, the mouth holes were arranged in an annular shape, and the discharge amount was 27.
It was spun at 8 g/min. An annular chimney with a length of 200 cocoons and an inner diameter of 150 Mφ was installed directly below the spinneret through an insulated tube with a length of 100 mm, and pressurized cooling air at 25°C was blown from the outer periphery of the yarn to maintain the internal pressure of the spinning cylinder in a pressurized atmosphere. 1.6 and 5 kg/
crri G were pressurized to form experimental types 1.2 and 6, respectively. The pressurized atmosphere spinning tube has an inner diameter of 150 lφ, and the total length from the spinneret to the outlet of the pressurized atmosphere spinning tube is 1.
It is 8m. After the spun yarn was cooled and solidified in the spinning tube, it was introduced into the outer cylinder pressure section through a guide, and then introduced into a heating zone as shown in FIG. The heating zone was installed from the lower part of LUGITE 200'1171k, had a length of 1 m and an inner diameter of 15#φ, and the tube wall was electrically heated from the outside and the ambient temperature was controlled at 170°C.

Well, pass the filter from the top of the heating cylinder to 3ONl1.
Heated air at 250°C was introduced for 1 minute.

After the yarn is hot-stretched in the heating zone, it is coated with a specified oil agent.
r and was taken up at a take-up speed of 5DOOm/min.
It was wound as a thread of 0 denier-24 filament.

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W! L K h--The movable cylinder at the bottom of the annular chimney was removed, a punching duct with an opening ratio of 60% was provided between 1 m below the annular chimney, and after normal atmospheric pressure spinning, the same method as in the present invention was made. was introduced into the heating zone and taken out. From the annular chimney, cooling air at 25°C (-1.5Nm) was blown in at a flow rate of 37 minutes.Normal pressure spinning was carried out in the above manner. (Experimental Form 4) Table 1 shows the physical properties of the yarns obtained by normal pressure spinning in comparison with the present invention.

Table 1)! As is clear from Experiments 1 to 3 in Table 1, the yarn obtained by the pressurized atmosphere spinning method of the present invention has high strength and has improved mechanical properties such as low elongation. I understand.

Example 2 The flow rate of heated air introduced into the auxiliary zone was changed as shown in Table 2, and the pressurized spinning cylinder internal pressure was kept constant at 3 kg/c; 50 denier 2
A yarn of 4 filaments/1.m was obtained. The strength/elongation and U% values of the obtained Z/Glue are shown in Table 2.

Table 2 As is clear from Table 2, the flow rate of heated air is 10 to 8ON.
It can be seen that when the temperature is 1/min, the U% value is low and the uniformity is good, which is preferable. From the viewpoint of such uniformity, the flow rate is 2.
It turns out that 0 to 50 Nl 1 minute is particularly preferred.

Example 3 The discharge amount was changed as shown in Table 6. Except for Example 1, yarns of 50 denier/l-24 filament, 75 denier-24 filament, and 100 denier-24 filament were prepared under the conditions of front side. I got it. Table 3 shows the strength of the obtained yarns.

Table 5 As is clear from Table 6, the strength of the comparative example was relatively low for varieties with a single yarn denier of 6 denier or more, but the strength was significantly improved by the pressurized atmosphere spinning of the present invention and reached a practical value. Recognize.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a typical embodiment of the process according to the present invention, and FIG. 2 shows an embodiment of the /-rule guide applied to the device of the present invention. 1 shows a plan view, and (b) shows a side view. Further, FIG. 3 is a longitudinal sectional view of a heating cylinder showing an example of the heating zone of the present invention. 1 - Spinning machine 2 - Raw material pumper 5 Melt extruder 4 - Metering pump 5 - Motor with variable speed gear 6 - Pack 7 - Mouthpiece 8 - Heating tube 9 Thermocouple' 10 Good''＞) o-511-yu Ah 12 - Annular chimney 13 Porous filter 14...Pipe for blowing pressurized cooling air 15...Air volume adjustment valve 16, 16' Ring member 17...Movable tube 18...Fixed tube 19/cylinder 20 Cylinder Lifting guide rod 21 Oil application device 22 / Exhaust volume adjusting pulp 23 - Exhaust piping 24.../-le guide 25 - Holder 26.27... Pressure gauge 2 days.../-le guide slit 29 - Heat exchanger 30a First godet roll 30b, second godet roll 31, tension detector 62, winder controller 63 winder 34,...
・Bobbin 6" 5・Heating zone 41...Heating cylinder 42...Heating gas supply section 46-Filter for introducing heated gas 44...Electric heater patent applicant Toshi Co., Ltd. Figure 1 Figure 6

Claims (3)

[Claims] (1) After a thermoplastic polymer that can be melt-spun is cooled and solidified by being discharged into a pressurized atmosphere spinning tube located directly below a spinneret and maintained at a higher pressure than the external atmosphere, substantially enough fluid is generated. From the outlet of the spinning tube, which is
A method for producing thermoplastic synthetic fibers, which comprises the steps of allowing the yarn to travel outside the spinning tube, running the yarn through a heating zone again, heating and drawing the yarn in the heating zone, and then taking it off with a take-off means. . (2) In the heating zone, while the atmosphere is heated from the surroundings,
Actively receive 10-8 ONt from outside! The method for producing a thermoplastic synthetic fiber according to claim (1), characterized in that: f: the thermoplastic synthetic fiber is formed by introducing heated gas at a rate of 1/min. (3) The method for producing a thermoplastic synthetic fiber according to claim (1) or (2), wherein the thermoplastic polymer is polyester.