JPS60259614A - 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 pressurized atmosphere, cooling and solidifying the extruded polymer in it once, drawing it under heating, pulling it from a sealing part into an atmosphere at normal pressure. CONSTITUTION:A thermoplastic polymer capable of being subjected to melt spinning is extruded in a molten state from the spinneret 7 into the column S of pressurized atmosphere set directly under it, cooled and solidified by the heat exchanger part Sa at the top of the column S, drawn under heating by the heating zone 35 set at the middle part of the column S, pulled out from the seling part 24 set at the bottom part of the column S, sent through the godet rollers 30a and 30b, and wound round the winder 33. Favorably the pressure of the column S is >=1kg/cm<2>, preferably >=3kg/cm<2> higher than normal pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 of 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 making it into a drawn yarn with practical mechanical properties. ◇Various attempts have been made to manufacture it.

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. To h?
Jl., an attempt to obtain yarn of practical quality only in the spinning process by taking the yarn discharged from the spinneret at high speed as disclosed in Japanese Patent Publication No. 5-4104 (hereinafter referred to as There is a method called 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 discloses a method (hereinafter referred to as the DSD method) in which the yarn discharged from one die is cooled and solidified, and then run through a heating zone again. ing. According to this method, it is possible to manufacture fibers at a relatively low cost, and the mechanical properties are close to those of conventional drawn yarns, so this method is considered to be the most effective method as a cost reduction process.

However, in recent years, there has been a demand to further improve the mechanical properties of yarns obtained through such cost reduction processes. As an approach to increase the strength of the yarn obtained by such a method of obtaining practical fibers with only one spinning process, dl, for example, Japanese Patent Publication No. 47-321
There is Publication No. 30. In this method, the molten polymer is spun into a pressurized chamber directly below the spinneret at a high spinning speed, cooled and solidified, and then the yarn is ejected together with high-speed pressurized gas from a nozzle at the bottom of the pressurized chamber, essentially all at once. This is a method to obtain drawn yarn. However, this method aims to obtain a drawn yarn with materials such as non-woven fabrics and webs, and since it is sent out at high speed mainly using the accompanying force of air, it is necessary to control the yarn, that is, the speed of the yarn, the drawing force, It has the disadvantage that it is difficult to control the stretching ratio, etc. Furthermore, the reality is that this method, like the high-speed spinning method disclosed in Japanese Patent Publication No. 5-1104, yields yarns that are far from having desired mechanical properties. or.

JP-A-52-118030 discloses a method in which a filament is cooled and solidified, passed through a tension zone, and then introduced into a heating zone to increase strength. As such a tension zone, rubbing against the thread by a guide is employed, but such a method damages the thread, which is undesirable. Also, JP-A-54-120733
No. VCId discloses a method in which a yarn is cooled using cooling air at a temperature of 35° C. or higher and then passed through a heating zone.

Such a method has the disadvantage that the improvement in mechanical properties is small, and the operation using high temperature cooling air becomes difficult.

[Purpose of the invention]

As mentioned above, with the conventional methods, it has not been possible to obtain high-strength yarn at low cost through a single spinning process.

An object of the present invention is to provide a novel melt-spinning method for obtaining high-strength yarn using a manufacturing process that is lower in cost than those proposed in the past.

[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 provided directly below a spinneret and maintained at a higher pressure than the external atmosphere, cooled and solidified, and then returned to a heating zone. After running the intermediate yarn and heating and drawing the yarn in a heating zone, the yarn is substantially sufficiently fluidly drawn from the outlet of the spinning tube by a take-up means provided outside the spinning tube. This is a method for producing thermoplastic synthetic fibers, which is characterized by introducing the fibers into a normal pressure section.

The wooden invention will be explained in detail below.

In the invention, a thermoplastic polymer is provided directly below the spinneret and is discharged into a pressurized atmosphere spinning tube, which is maintained at a pressure higher than that of the normal pressure part, and cooled and solidified, while the yarn is expelled into the pressurized atmosphere. It is important that the yarn is allowed to run, and then the yarn is reintroduced into the heating zone and then removed from the pressurized spinning tube.

According to the research of the inventors of the wood, in order to increase the strength in the above-mentioned DSD method, it is necessary to increase the stress applied to the thread V at the point where it enters the heating zone.

It has also been found that rapidly cooling the spun yarn has a great effect. As a concrete means of increasing the stress of light removal, it is important to take care to avoid damage to the yarn. For example, if a means such as rubbing with a yarn guide is employed, stress can be prevented, but the occurrence of fuzz during spinning increases. In order to increase the stress of the yarn without damaging the yarn, and to rapidly cool the spun yarn, the yarn is discharged into a pressurized atmosphere and then rapidly cooled and solidified. The method of running inside is the easiest to implement in terms of operation and is also the most effective. The reason why the stress can be increased by running the yarn in a pressurized atmosphere is thought to be that in the pressurized atmosphere, the yarn is rapidly cooled and the air resistance acting on the yarn increases.

In the present invention, a yarn having higher strength than conventional methods can be obtained only by drawing under high stress.

In addition, in the present invention, as mentioned above, the yarn is run in a pressurized atmosphere ζ
After that, the yarn is introduced into the heating zone, and then the yarn is pulled out from the pressurized atmosphere. 'v: ,v*zA,-08,. . 7-
If there is a 7° to 7° process, not only will the pressure inside the pressurized atmosphere spinning cylinder not be able to rise sufficiently, but the pressure within the pressurized atmosphere spinning cylinder will also fluctuate greatly, which will have an impact on the yarn drawing effect. picture,
The uniformity of the resulting yarn is reduced. From this perspective [
] It is essential that the atmosphere is pressurized from directly below the gold.

In the present invention, it is necessary to have a heating zone in the spinning tube in a pressurized atmosphere, so that hot drawing can be carried out without drawing the yarn out of the spinning tube. There is no need for bundling, so each single yarn is heated uniformly, stable operation is possible, and yarns with good uniformity can be obtained.

As described above, the yarn travels through the spinning tube under a pressurized atmosphere, is then introduced into the heating zone, is heated and drawn in the heating zone, and is then taken off by a take-off means outside the spinning tube.

In this way, the present invention spins the yarn into the spinning tube which pressurizes the atmosphere directly below the spinneret, rapidly cools it, and runs the yarn in the pressurized atmosphere while cooling and solidifying the yarn. After the yarn has been drawn to a high degree, the yarn is re-drawn in a heating zone and then taken out of the spinning tube. This makes it possible to produce high-strength yarn at low cost in just one spinning process. be.

As the heating zone of the present invention, it is sufficient that the space through which the yarn passes is heated, and for example, a tube having a cylindrical shape or a rectangular cross section may be used, but is not limited thereto. In addition, in order to uniformly stretch in such a heating zone, it is preferable to actively introduce heating gas of 10 to 8 ONt from the outside while heating the periphery of the heating zone and increasing the atmospheric temperature within the heating zone. . The uniformity of the yarn obtained by introducing this heated gas is further improved. At this time, the temperature of the heating gas and the ambient temperature of the heating zone are preferably higher than the glass transition temperature of the polymer, especially 100°C to 6°C.
00°C is preferable for operation. In addition to air, inert gases such as nitrogen and helium, and water vapor can be used as the heating gas introduced into the heating zone, but air is particularly advantageous as it is easy to handle and is inexpensive. Furthermore, when introducing heated gas into the heating zone, the uniformity of the obtained yarn is greatly improved if the gas is rectified through a wire mesh filter, nonwoven fabric made of metal, sintered metal, etc.

The melt-spun thermoplastic polymer applicable to the present invention is
Poly-ε-capramide, polyhexamethylene adipamide, polyhexamethylene seno; camido, polytetramethylene azino ζamide, polyhexamethylene terephthalamide,
Polyamides such as polyhexamethylene inophthalamide, polydodecamethyleneph dodecamide, polymethacrylate/renazino ζamide, borivalaki/rylene adipamide, polynye F
-L/noterephthalate, polytetramethylenenoterephthalate, polyethylene 1.2-sifenoki/ethane PP
'-Polyesters such as dicarboxylate, polyna-7talene terephthalate, polyolefins such as polyethylene, polypropylene/polybutene-1, polyvinylidene fluoride, polyfluorinated ethylene/-polyvinylidene fluoride copolymer, poly These are ordinary thermoplastic polymers that can be melt-spun, such as vinyl chloride, polypinylidene chloride, and polyacetal, and each contains two or more types of copolymerized polymers and mixed polymers.

"Among the thermoplastic polymers listed in Section 2, polyesters.

In particular, when the invention is applied to polyethylene terephthalate, the effect of the invention becomes more remarkable. However, when the invention is applied to thick polyester varieties with a single yarn denier of 6 denier or more, the effect is remarkable.

In other words, in the case of thick products with a single yarn denier of 3 deniers or more, the stress applied to the yarn at the entrance of the heating zone in the conventional method was particularly small (ζ). This makes it possible to improve physical properties. or,
'' The effect of improving the physical properties of the two series becomes particularly noticeable when the take-up speed is 3000 m/min or more, which is preferable. In addition, taking into consideration realistic operability, optical properties, spinning stability, etc., the take-up speed ρIW is 4.
000 to 8000 m/min is preferable.

(1) The uninvention will be explained with the diagram below.

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

In the figure, 1 is a spinning machine, and the spinning machine has a tip T
4. Injected raw material Hono'-2, melt extruder filter, Nukling pump 4. It consists of a motor 5 with a transmission, a pack 6 and a base 7.

Chips T from the raw material hopper 2 are passed through a metering pump 4 in a polymer state by a melt extruder 6 in a spinning machine 1, and then passed through a filter (not shown) in a bag 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 σ
By controlling the rotation speed of the motor 5,
The amount of yarn Y to be discharged can be determined.

In the uninvention, a pressurized atmosphere spinning tube S is provided directly under the nozzle 6 to which the spinneret 7 is attached, and by introducing pressurized fluid into the spinning tube, the inside of the spinning tube is brought into a high pressure state. ).

Regarding the pressurized atmosphere spinning tube S, a heating tube 8 is attached to the spinning machine 1 as needed directly below the spinneret, which will be described in more detail below. An annular chimney 12 of a pressure cooling air blower is installed. 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. 1. 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 controls the heater (
(not shown), so that the atmospheric temperature inside the heating cylinder can be brought to a set value. The temperature of the heating cylinder is usually in the range of -40°C to the melting point of the polymer -1 to 100°C, and the length of the heating cylinder is approximately 5 crn to 1 m.

A cylindrical porous filter 13 is installed in the annular chimney 12, and the filter 13 receives the pressurized cooling air sent from the pressurized cooling air blowing distribution W14 that opens into the annular chimney 12. The structure is such that it blows out almost uniformly in the longitudinal direction and the circumferential direction 1c. A valve 15 for adjusting the air volume is attached to the pressurized cooling air blowing pipe 14Vc. 26 is a pressure gauge.

A movable cylinder 17 is housed inside a fixed cylinder 18 below the annular chimney 12, and the movable cylinder 17 is attached to the movable cylinder and works in conjunction with a cylinder 19, and is fixed by the operation of the cylinder 19. It is designed to be able to move up and down within the cylindrical body 18.

During work such as threading, the movable cylinder 17 is moved.

A working space is secured between the lower end of the annular chimney 12 and the upper end of the movable cylinder 17, so that during normal winding, the upper annular chimney 12 can be raised and pressed by changing its position. There is.

Note that the sliding part between the OT movable cylinder 17 and the fixed cylinder 18 and the contact area between the movable cylinder 17 and the annular chimney 12 are provided with a 7-ring part 16, such as an 011 ring. +6' is provided to ensure a leak-free structure. Similarly, a movable cylinder 17' is provided below the fixed cylinder 18 and can be moved up and down in conjunction with the hinge 19'. A heating zone 35 is provided below the movable cylindrical body 17', and is connected to the movable cylindrical body 17' by an O-ring. Below the heating zone 65, a movable cylinder 17'' and a fixed cylinder 18' are installed in the same manner as described above.The movable cylinder 17.1
7' and 17' are all designed to provide the necessary working space during threading. or.

A guide lubricating device 21 for applying lubricant is installed below the fixed cylinder 18'.

Further, at the thread exit portion at the lower end of the fixed cylinder 18'.

As shown in Fig. 2, a knoll guide 24 is installed, which has a minute slit 28 that allows the yarn to pass through, and which ensures sufficient fluid flow due to the pressure loss at the slit. The guide holder 25 has been removed (second
Figure (a) shows a plan view, and (b) shows a side view). The airflow accompanying the yarn leaks only slightly from the guide 24, and the leakage of the airflow does not cause significant shaking of the yarn and does not cause entanglement between the yarn patterns.

A pressure gauge 27.27' and exhaust piping 23.23' are provided below the fixed cylinder 18.18'.

The pipe 25 is connected to the outside atmospheric pressure section via valves 22, 22'.

Therefore, by simply bringing the movable cylinders 17, 17' and +7'' into contact with the annular chimney 12 and the upper and lower parts of the heating zone filter 5, respectively, the distance from directly below the mouthpiece 7 to the pool guide 24 at the lower end of the fixed cylinder 18' is A sealed space, that is, a pressurized atmosphere chamber Sa below the base can be easily obtained.

Further, the outer wall of the fixed cylinder 18.18' is a heat exchanger 29.2.
9', and has a structure in which the atmospheric temperature in the pressurized atmosphere spinning chamber Sa can be cooled by a refrigerant (not shown) flowing inside the heat exchanger 29, 29'.

The pressure and flow of the cooling air sent into the pressurized atmosphere chamber Sa is controlled by the valve 22, 22' and the valve 15 provided at the inlet of the annular chimney 12. can do.

Now, when the melt-spun yarn Y is discharged from the nozzle 7 into the pressure-sealed pressurized atmosphere chamber Sa below the nozzle, the yarn Y is kept at a set temperature by the temperature controller 1o. After traveling through the slow cooling area in the annular chimney 12, the vehicle is cooled by pressurized gas (in this embodiment, pressurized air) blown in from the annular chimney 12.

Further, while the thread Y travels within the identification cylinder 18 covered with the movable cylinder 17 and the heat exchanger 29, cooling is promoted and solidified. After that, it is introduced into the heating zone 55 and heated and stretched, and then travels inside the fixed cylinder 18', after which it is applied with a lubricant by the guide lubricating device 21, passes through the nord guide 24, and is installed in the outside air normal pressure section. The first motor rotates at a constant circumferential speed.
Godet roll 30a, furthermore, second Godet roll 3
After passing through Ql), the yarn Y is wound around a winder 33 (7) and a hobbin 34.

The rotation speed of the bobbin 64 of the winder 33 is determined by the tension detector 3 provided between the second godet roll 30b and the winder 34.
1, the winding tension of the yarn Y is detected and controlled by the controller 32Vc so that the tension is approximately constant.

According to this embodiment, the amount of pressurized air flowing into the pressurized atmosphere chamber Sa at the lower part of the first cap is controlled by the valve 15 provided at the inlet of the annular chimney 12 near the lower end of the fixed cylinder 18, 18'. By adjusting the amount of pressurized air flowing out from the pressurized atmosphere chamber Sa to the normal pressure atmosphere using the provided valves 22 and 22', the yarn is It becomes possible to freely control the amount of pressurized cooling air flowing along the Y running direction.

Furthermore, although air is exemplified as the pressurized fluid in the embodiments shown in the drawings, any gas inert to the polymer, such as nitrogen or water vapor, may be used. In operation, air is preferred because it is the easiest to handle and is low cost, but it is advantageous to use a gas with a high density or a gas with a high viscosity because it can further reduce the stress.

Further, the pressure inside the spinning cylinder is preferably set to 11 or more (normal pressure is 0%) in order to make the effects of the present invention remarkable. The heat exchanger 29, 29' that cools the ambient temperature in the pressurized atmosphere chamber Sa at the bottom of the nozzle also allows the air in the pressurized atmosphere spinning cylinder to exchange heat with the spun yarn and to diffuse the heat in the heating zone. This prevents the temperature from rising and the cooling effect of the yarn from decreasing, but it is not limited to the case where the refrigerant is flowed through the outer wall of the fixed cylinder 18°18' as on the Kinotsu side. Means such as a heat pipe may be used to directly cool the ambient temperature inside. The process shown in the figure takes a lance near the thread outlet and maintains a predetermined pressure.

The discharge amount is relatively small, and the heat is radiated through the outer wall of the spinning tube, or the outer wall of the spinning tube is actively used. : ? 'a
8t-')□517.6i5.9ke. Ah, if it is less than 2 degrees and the yarn can be sufficiently cooled, the airflow blowing section can be kept closed.

In addition, on the Kinomio side, the exhaust valves 22 and 22' are opened to flow pressurized cooling air into the pressurized atmosphere chamber Sa at the bottom of the base.
Although the heat exchangers 29 and 29' promote cooling of the yarn Y, these are not necessarily necessary depending on the winding conditions. Further, in order to equalize the melt viscosity between the individual yarns Y discharged from the mouth surface of one nozzle 7, a heating cylinder 8 was installed, but depending on the conditions of the polymer, these are not necessarily necessary.

Moreover, FIG. 3 is a longitudinal sectional view of a heating cylinder showing an example of the heating zone of the present invention. After passing through the pressurized atmosphere spinning tube, the yarn Y travels around the heating tube 41 heated by an electric heater 44 and is heated. A filter 43 for introducing heated air is provided at the top of the heating cylinder, and a heated gas supply section 42 is provided surrounding the filter to introduce heated gas 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 method for raising the ambient temperature in the heating zone, but a heating medium heating method may also be used, and the method is not limited to these.

〔Effect of the invention〕

As mentioned above, by spinning a thermoplastic polymer in a pressurized atmosphere, increasing the stress applied to the yarn, and then introducing it into a heating zone, high-strength yarn can be spread over a wide range. A wide variety of products can be manufactured at low cost.

The present invention is particularly effective for polyester yarns having a single yarn denier of 3 deniers or more, which conventionally only had low strength yarns could be obtained using the approximately DSD method using a heating zone. In addition, the drawn yarn obtained by the Ki process has high strength and excellent uniformity, and can be applied to all fields where conventionally drawn yarn can be applied.The advantage of the Ki process is that the drawn yarn is low cost. The point is that it can be manufactured stably.

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

A1 strength elongation Tenonro/Tensile testing machine manufactured by Toyo Baldwin Co., Ltd., sample length 2oowlI++, tensile speed 100m/
The strength and elongation curve was calculated under the following conditions:

B. Uniformity (Worcester's mottling) Yarn speed of 25 m using Noelberger's Worcester's mottling tester
The unevenness in the fiber axis direction was measured under the conditions of a /min range of ±12.5'% and a chart speed of 5 Crn/min, and the U% value was determined.

C1 intrinsic viscosity [η] O-chlorophenol, measured at 25°C.

Example 1 Using the spinning take-off device shown in FIG.
0.65 polyethylene terephthalate was melt spun. The spinning temperature is 290℃, the diameter of the spinneret is 02mm, and the number of holes is 36.
The holes were arranged in an annular manner, and spinning was carried out at a discharge rate of 41 g/min.

Directly below the cap, there is a tube with a length of 20 mm through an insulating tube of length jDOmn.
An annular chimney with an inner diameter of 150 mm and an internal diameter of 150 mm was set aside, and pressurized cooling air at 25° C. was blown from the outer periphery of the yarn to increase the internal pressure of the spinning tube in a pressurized atmosphere to 1.5 and 51 G.

The pressurized atmosphere spinning cylinder has an inner diameter of 150 m+nφ, and a heating cylinder as shown in FIG. 3 is installed 15 m below the spinneret surface. The heating cylinder has a length of 1 m and an inner diameter of 35 mm, and the diameter of the yarn inlet and exit portions is 10 mm. The tube wall of the heating cylinder was electrically heated and the tube wall temperature was controlled at 250°C.

In addition, 3ONt1 is passed through a filter from a part of the heating cylinder.
Heated air at 250° C. was introduced. The yarn hot-drawn in the heating tube continues to travel inside the spinning tube in a pressurized atmosphere, and after being applied with a predetermined oil agent from the heating tube at 50 CrnT, it passes through a knoll guide to the outside air normal pressure section, and is transferred to an external take-up roll. It is served by the tail. The speed of the withdrawal roll is 5ooo
m/min, and was wound as a 75 denier-36 filament yarn around a predetermined bath cage.

For comparison, the movable cylinders 17, 17', 1 are used for the spinning cylinder in Figure 1.
7'/ was removed, and the sol duct at the bottom of the spinning tube in a pressurized atmosphere was removed, and while spinning was carried out under normal atmospheric pressure, the yarn was introduced into a heating tube similar to that of the present invention and drawn while being hot drawn. 1.5N of 25℃ cooling air from the annular chimney? Spinning was carried out in the same manner as in the examples of the present invention, except that atmospheric pressure spinning was carried out using two or more methods of blowing at a flow rate of 71'/min.

Table 1 shows the yarn physical properties of Examples of the present invention and Comparative Examples.

Table 1 As is clear from Table 1, in experiments N11 to 3 using the pressurized atmosphere spinning method of the present invention, the strength was increased and the elongation was small, indicating that the mechanical properties could be improved by 1.

Example 2 A sample of 75 denier 36 filament was prepared under the same conditions as in Example 1, except that the flow rate of heated air introduced into the heating zone was changed as shown in Table 2, and the pressurized spinning cylinder internal pressure was kept constant at 3" taG. The strength and elongation and U% values of the obtained samples are also listed in Table 2.

Table 2 As is clear from Table 2, the flow rate of heated air is 10 to 8 ONt.
It can be seen that at 1 minute, the U% value is low and the uniformity is good, which is favorable. From the viewpoint of such uniformity, the flow rate is 2.
It can be seen that 0 to s ON t/min is particularly favorable.

Example 5 110 denier-5 under the same conditions as Example 1 except that the discharge amount and the internal pressure of the pressurized atmosphere spinning tube were changed as shown in Table 6.
Yarns of 6 filaments and 150 denier-66 filaments were obtained. The strength of the obtained yarn is also listed in Table 6.

Table 3 As is clear from Table 5 and Example 1, varieties with a single fiber fineness of 5 denier or more, that is, uninvented! Outside (Experiment N-1
9, 20), the strength is usually low, but it can be seen that the strength can be significantly improved by applying the uninvented method.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a typical embodiment of the process according to the invention, and FIG. 2 shows an embodiment of the seal guide applied to the device of the present invention. A plan view is shown, and a side view is shown. Fig. 3 is a longitudinal sectional view of a heating cylinder showing an example of an uninvented heating zone. 1... Spinning machine 2... Raw material hopper 6 - Melt extrusion Machine 4°゛° Metering pump 5... Motor with transmission 6 - Puncture 7'° Mouth Metal 8... Heating tube 9... Thermocouple 10... Temperature controller 11゛ Insulating tube 12°゛ - Annular Chimney 13... Porous filter 14... Piping for blowing pressurized cooling air 15... Air volume adjustment pulp 16. 16', 16'', 16#... Hole member 17.
17', 17'...Movable cylinder 18.18'...Fixed cylinder 19, 19', l'...Cylinder 20, 20'
, 20'...Cylinder lifting guide rod 21...Local device with oil 22.22'...Displacement adjustment valve 25.25'...Exhaust pipe 24...Seal guide 25...Holder 26 .27.27'...Pressure gauge 28.../-Le guide slit 29.29'...Heat exchanger 30a...First godet roll Mob...Second godet roll 51...Tension detection Winder 32... Winder controller 53... Winder 34... Bobbin 55... Heating zone 41... Heating cylinder 42... Heated gas supply section 45°°° Filter for introducing heated gas 44...Electric heater 45...Insulating material 46.46'...Connection patent applicant Toshi Co., Ltd.

Claims (1)

[Claims] (1) A thermoplastic polymer that can be melt-spun is discharged into a pressurized atmosphere spinning tube located directly below the spinneret and maintained at a higher pressure than the external atmosphere, cooled and solidified, and then returned to the heating zone. After the yarn is run and heated and drawn in a heating zone, the yarn is constantly drawn from the outlet of the spinning tube, which has been substantially sufficiently fluidized, by a take-up means provided outside the spinning tube. A method for producing thermoplastic synthetic fibers characterized by guiding the fibers to the pressure section (2) The heating zone is constructed by introducing heated gas of 10 to 80 N11 minutes from the outside in a cumulative manner while the atmosphere is heated from the surroundings. A method for producing a thermoplastic synthetic fiber according to claim (1).