KR20030058353A - Method of and apparatus for controlling quenching air in spinning machine for thermoplastic synthetic microfiber - Google Patents

Abstract

PURPOSE: On a spinning device of thermoplastic synthetic fiber fine yarn, a cold air controlling method and a cold air controller are characterized by controlling flowing of a first cold air on a quenching zone, feeding a second cold air, controlling flowing of cold-air ascending current, having simple structure and being inexpensive. The cold air controlling method and the cold air controller are capable of preventing fluctuation of spinning conditions, increasing uniformity and elongation, increasing spinning velocity, spinning multi-products under the same conditions and controlling discharge of cold-air ascending current. CONSTITUTION: The cold air controlling device is comprised of: a condenser(30) installed on a lower part of the quenching zone using an inflow type device or a different cooling device; an accelerating tube(44) connected with a lower end of the condenser; a conical spin tube(50) connected with a lower end of the accelerating tube; and a second cold-air injecting device feeding the second cold air downward to an inner circumference of the accelerating tube.

Description

Method for controlling cold air of thermoplastic synthetic fiber spinning device and controlling device {Method of and apparatus for controlling quenching air in spinning machine for thermoplastic synthetic microfiber}

The present invention relates to a cooling apparatus applied to a spinning apparatus of a thermoplastic synthetic fiber yarn by a melt spinning process, and in particular, to control the flow of primary cooling air supplied to a cooling zone by supplying secondary cooling air to an accelerated region of the filament. The present invention relates to a cold air control method and a control device for controlling cold air rising air in an acceleration region.

In the melt spinning process of the thermoplastic synthetic fiber yarn, while discharging the polymer melt into dozens of filaments through the spinning nozzle, the cooling filaments are supplied to the discharged filaments at a constant pressure by cooling to solidify the cooling and solidify the cooling. It is a process of stabilizing dozens of filaments of the filament passing through the acceleration zone, collecting them into a single line of yarn (yarn) and winding them into bobbins by post-feeding and winding apparatus in the winding zone to form synthetic fiber yarns.

In the melt spinning process of the thermoplastic synthetic fiber yarn, the filaments discharged from the spinning nozzle form a thin filament bundle as a viscous viscoelastic fluid. This plastic property is changed from fiber property.

In the cooling and solidification process of the filament, the characteristics of the cooling device, the temperature and the wind speed of the cold wind play an important role in the formation process of the overall synthetic fiber yarn. It is an important factor that influences the physical properties, characteristics, production speed and operation of the firm.

Among the cooling devices provided so far, an inflow type cooling device is installed at the bottom of the nozzle, and installs a porous air filter which supplies air from the outside while blocking external air to the radiating filament. It is a configuration that cools by supplying the cooling air which is arbitrarily controlled to the filament to be radiated at a constant wind speed.

The inflow type cooling device of this configuration has a merit that a relatively stable thermal balance can be obtained compared to other types of cooling devices in that the air filter blocks the interference airflow (temperature and wind) from the outside during the filament solidification process. have.

However, the flow characteristics of the cooling air introduced into the porous air filter in the in-floor type cooling device also do not act evenly on the filament from which the cooling air is radiated as a whole. This occurs, and the cooling air acting on the filament to be radiated has a characteristic that can not be discharged smoothly to the lower spin tube side could not obtain a high quality cooling effect.

In addition, in the case of high-speed spinning where the spinning speed (winding speed) should be maintained at a constant speed (about 4500m / min) or more, in response to the descending speed of the filament, the inside and outside of the spin tube is moved toward the cooling zone. As rising cold air rises, the cold air rises not only destabilizes the air flow in the spin tube, but also flows into the porous air filter in the cooling zone, causing air flow instability of the primary cooling air. By changing the spinning conditions, such as filament flows to cause cutting and breaks the thermal equilibrium of the cooling zone, and fluctuates the temperature of the nozzle to maintain a high temperature of a certain value, the properties such as elongation and uniformity of the solidified filament The problem of deterioration arises.

Among the above problems, in order to solve the problem in the cooling zone due to cold wind rise in high-speed spinning, in the past, a hot zone having a heating device is provided on the cooling zone side, and a nozzle caused by cold wind rise The temperature drop phenomenon of the filament is corrected to a certain level, but since the degradation of physical properties due to the flow of the filament due to the cold wind rise can not be solved at the source, the radiation speed is lowered below the level that suppresses the occurrence of the cold wind rise. The situation is in line.

Generally, the finer the finer the synthetic fiber, the higher the spinning speed to increase productivity.However, the problems caused by the cold wind rise and the limitation of the control of cold air supply and pressure by the porous air filter of the in-floor cooling system. Due to this, the spinning speed could not be increased above a certain speed, which ultimately resulted in limited productivity due to limited operation and production speed, and could not produce high quality microfiber smoothly due to non-uniformity of cooling efficiency and cooling quality. .

In addition, when using a polymer of any specification (polymer) to produce a synthetic fiber yarn of any specification with a spinning device of any specification, the characteristics of the inflow cooling device and the characteristics of the polymer and spinning nozzle It is manufactured according to the characteristics of synthetic fiber yarn,

If you use different types of polymer in the same spinning device or if you want to change the properties of synthetic fiber, you have to respond by changing the supply amount and cooling distance of cooling air, but inflow cooling device is cooled due to the characteristics of porous air filter. The supply amount and cooling distance of the air are almost limited, and it is difficult to increase or decrease the production speed, and there is a problem of redesigning and replacing the entire hundreds of cooling devices installed in the production line.

As a matter of fact, whenever the type or physical properties of the polymerizer are changed in the radiator of any standard as described above, redesigning or replacing the entire hundreds of cooling devices has a problem of causing high productivity and a decrease in productivity.

Conventionally, the secondary cooling air is supplied from the acceleration zone between the cooling zone and the winding zone to control the flow of the primary cooling air in the cooling zone, and the inflow of the cooling wind rise air flow into the cooling zone in the winding zone. This is known, but only the method principle is provided, the practical method or configuration is weak, it is difficult to apply to the field, the theoretical effect could not solve the above problems smoothly.

The present invention is provided to solve the cooling problems of the inflow method or other cooling device in the radiator as described above, to control the flow of the primary cooling air in the cooling zone, supply the secondary cooling air and cold air It is an object of the present invention to provide a cold air control method and a control device for a thermoplastic synthetic fiber yarn spinning device that can control the flow of rising air, prevent fluctuation of spinning conditions, increase elongation and uniformity, and increase spinning speed.

Another objective is to forcibly downflow the cold wind rising air generated in response to the spinning speed so as to carry out the spinning process under the same conditions and the spinning apparatus under the same conditions. An object of the present invention is to provide an adjustable cold air control device for a thermoplastic synthetic fiber yarn spinning device that can be controlled.

Another object is to provide an adjustable cold wind control device that is easy to apply to the spinning apparatus provided with the existing inflow type cooling device, and has a simple structure and low cost in the configuration of the device related to the above object. .

1 is a cross-sectional configuration diagram of a cold air control device according to an embodiment of the present invention.

2 is a block diagram of an example of a radiation device to which an embodiment cold air control device is applied to the present invention;

3 is a cross-sectional exploded view of a cold air control device according to an embodiment of the present invention;

Figure 4 is a cross-sectional view of another state of use of the cold air control device according to an embodiment of the present invention.

5 is a cross-sectional view taken along the line A-A of FIG.

Figure 6 is an enlarged cross-sectional view of the main portion of the cold air control device according to an embodiment of the present invention;

Figure 7 is an enlarged view of a part of the configuration of Figure 6

8 is a cross-sectional configuration of another embodiment cold air control device according to the present invention;

(Short description of symbols for the main parts of the drawing)

11: Nozzle 12: Spinning filament 12: Sludge input hopper

20: Inflow cooling duct 21: Porous air filter

23, 23a: Air filter upper and lower flange 24: Tension bar

25, 26: Upper and lower plates of the cooling duct 28: 1st blower

29: Secondary blower 30: Capacitor 31, 32: Capacitor upper and lower flange

31a: Bolting hole for upper and lower flange 40: Cold air controller

41: Cold air control pipe 41a: Bolt fastening hole of cold air control pipe

42: adjusting tube assembly 42a: female thread 43: control air chamber

44: control acceleration tool 44a: inner end of the upper end of the control acceleration tool 44

45: connector 46: cold air control pipe 47: cold air control ring

48a: male part 48: flange 49: gripping ball

50: Spin tube 51: Flange B1, B2, B3: Bolt

CL: clearance between the cold wind control ring 47 and the inner end 44a of the upper end of the control accelerator 44

One configuration of the present invention for achieving the above object,

In the spinning process of a thermoplastic synthetic fiber yarn by a melt spinning process, a condenser installed at a lower portion of a cooling zone using an inflow type or other cooling device, and an acceleration connected to a lower end of the condenser. Applied to the radiator having a tube and a conical spin tube connected to the lower end of the accelerator tube, it comprises a cold air control method comprising the step of supplying the secondary cooling air downward to the inner wall circumference of the accelerator tube. It is characterized by.

Another configuration of the present invention for achieving the above object,

In the spinning apparatus of a thermoplastic synthetic fiber yarn by a melt spinning process, a condenser provided at a lower portion of a cooling zone using an inflow method or other cooling device, an acceleration tube connected to the lower end of the condenser, and this acceleration Applied to the configuration having a conical spin tube connected to the lower end of the tube, characterized in that the cold air control device having a secondary cooling air injection means for supplying the secondary cooling air downward to the inner wall circumference side of the acceleration tube It is done.

One configuration of the present invention for achieving the another object is characterized in that the cold air control device for achieving the above object comprises a cold air control device further comprises an injection air amount adjusting means in the secondary cooling air injection means. It is done.

Hereinafter, the cold air control method and the cold air control device according to the present invention will be described with reference to the configuration and use state diagram of the cold air control device according to the embodiment.

1 to 7 illustrate a configuration and a use state of an embodiment cold air control device of the present invention applied to a radiating device having an inflow cooling device as an example.

In the angle, reference numeral 11 denotes a spinning nozzle, reference numeral 12 denotes a spinning filament, reference numeral 20 denotes an entire inflow cooling duct for supplying primary cooling air, reference numeral 30 denotes a condenser, and reference numeral 40 denotes an embodiment of the present invention. And 50 denote spin tubes, respectively.

The inflow cooling duct 20 has a porous air filter 21 installed at the center side, and an air blowing pipe 22 for supplying cooling air from the primary blower 28 is connected to the outside.

The upper and lower portions of the inflow cooling duct 20 are closed by tightening the upper and lower plates 25 and 26 and the upper and lower flanges 23 and 23a of the porous air filter by the tightening bar 24.

The condenser 30 is an inverted conical tube attached to the lower end of the inflow cooling duct 20, and the upper end is attached to an upper flange 31 so that the lower flange 26 of the inflow cooling duct 20 is lower. It is assembled in a sealed state by the tightening bar 24, the lower end is attached to the lower flange 32 is assembled with the upper end of the cold air control device 40 and the bolt (B1).

The cold air control device 40 is composed of a cold air control pipe 41 and the cold air control pipe 46.

The cold air control tube 41 has an upper diameter adjustment tube assembly 42 having a larger diameter than the inner diameter of the condenser 30 with a female threaded portion 42a, and in the middle of the control tube assembly 42 A control air chamber 43 having a connector 45 for receiving cooling air from the secondary blower 29 is formed in one side end while being formed as a cylindrical chamber having a diameter larger than the diameter, and the control air chamber 43 below. The control acceleration hole 44 penetrated through the cylindrical hole from the inner lower end of the condenser 30 to the lower end with a diameter of the inner diameter and the approximation is formed.

The cold air control pipe 46 is a flange 48 having a male screw portion 48a fitted by screw assembly to the control pipe assembly 42, which is an upper end of the cold air control pipe 41, and of the flange 48 It extends to the lower end has an inner diameter and a predetermined clearance (CL) of the upper end to the control acceleration hole 44 is inscribed and consists of a cold air control ring 47 formed on the outer side downward gradient.

The spin tube 50 is a conventional conical tube having a flange 51 at the top and assembled with bolts B2 at the bottom of the cold air control tube 41.

Reference numeral 31a is a bolt fastening hole formed in the condenser flange 31, 41a is a bolt fastening hole formed in the upper and lower ends of the cold air control tube 41, 49 is a gripping hole for the rotation of the cold air control tube 46 It is displayed.

One embodiment of the cold air control device 40 of the present invention in the above configuration is assembled to any depth by screwing the cold air control pipe 46 inside the control pipe assembly 42 at the upper end of the cold air control pipe 41. So,

According to any secondary air supply coefficient value determined according to the type of polymer or yarn and other spinning conditions, the cold air control ring 47 and the control accelerator 44, which are lower members of the cold air control pipe 46, are used. The clearance CL with the upper end inner end 44a is adjusted at an arbitrary interval and used in a fixed manner.

The operating state of the embodiment the cold wind control device 40 of the present invention applied to the spinning apparatus having the inflow type cooling apparatus of the above example is as follows.

As shown in FIG. 1, in the spinning apparatus having an example inflow cooling system, when the polymer spinning process is started in the spinning apparatus set to a predetermined spinning condition, several strands of filaments 12 are removed from the nozzle 11. Is radiated and discharged to the spin tube 50 through the center of the cold air control ring 47 of the condenser 30 and the cold air control tube 46 through the center of the porous air filter 21 of the inflow cooling duct 20 In the lower part of the spin tube 50, the spinning process of winding the bobbin is completed through a predetermined oiling process and other post processes.

In the above-described spinning process, the plurality of strands of filament 12 radiated from the nozzle 11 include the porous air filter 21 having the primary cooling air having a constant wind velocity introduced into the blower tube 22 of the inflow cooling duct 20. Cooling and solidifying the filament (12) through, the cooling air acting on the filament (12) passes through the condenser (30) along the downward filament (12) and the central portion of the cold air control ring (47) of the cold air control pipe (46) And it is discharged to the lower portion of the spin tube 50 via the central portion of the control acceleration port (44).

In parallel with the cooling solidification process and the discharge processes to the spinning filament 12 through the primary cooling air in the inflow cooling duct 20, the secondary cooling air in the cold air control device 40 is cold air control tube 41 It is supplied to the control acceleration port 44 of.

The process of supplying the secondary cooling air from the cold air control device 40 to the control acceleration hole 44 of the cold air control pipe 41 is secondary cooling at a constant wind speed through the connector 45 in the secondary blower 29. When the air is supplied to the control air chamber 43, the secondary cooling air is inside the upper end of the cold wind control ring 47 and the control accelerator 44, which are the lower members of the cold air control tube 46, which are set to predetermined radiation conditions. It is extruded downward on the inner wall of the control acceleration port 44 through the clearance CL of the periphery before connection with the stage 44a.

Accordingly, the secondary cooling air extruded downward through the inner wall of the control acceleration hole 44 performs the secondary cooling action on the bundle of the filaments 12 passing through the control acceleration hole 44 and the central portion of the spin tube 50. At the same time, the primary cooling air flowing in the porous air filter 21 of the inflow cooling duct 20 is added downward by adding a double speed to the descending flow of the primary cooling air discharged downward with the filament 12. In addition, it acts to induce the falling, and at the same time to suppress the generation of the cold air rise in the spin tube (50) corresponding to the falling speed of the filament (12) or lowering control.

In the implementation of the present invention as described above, the configuration of the above-described embodiment is presented as a preferred embodiment for carrying out the present invention, but is not necessarily limited thereto.

In constructing the cold air control device of the present invention, the secondary cooling air injection means has a cold air control ring 47, which is a lower member of the cold air control pipe 46, inside the upper end of the control accelerator 44, as in the embodiment described above. It is preferable in terms of general versatility of the spinning device to control the formation of the secondary clearance air (CL) formed by the internal stage 44a and adjustable, to control the secondary cooling air injection amount, but the secondary set according to the specific spinning conditions It is also preferable in terms of manufacturability and mass productivity to form a configuration in which the cooling air injection amount is fixedly supplied.

8 shows the configuration of the cold air control device 40b according to another embodiment in which the secondary cooling air injection means is fixedly formed to form the secondary cooling air injection amount in the configuration of the cold air control device of the present invention.

The configuration of the cold air control device 40b of the other embodiment includes a cold air control pipe 41b coupled to a flange joint between the condenser 30 and the spin tube 50, and a fixed type inside the cold air control pipe 41b. Consists of a cold air control device (40b) having a cold air control pipe (46b) assembled to

The cold air control tube 41b has an upper diameter adjustment tube assembly 42b having a stepped upper end than the inner diameter of the condenser 30 and has a stepped upper end, and in the middle, larger than the diameter of the control tube assembly 42. A control air chamber 43 having a connector 45 for receiving cooling air from the secondary blower 29 is formed in one side end while being formed as a cylindrical chamber of diameter, and the lower side of the inner side of the control air chamber 43 is formed. The control acceleration hole 44 penetrates through the cylindrical hole from the inner diameter and the approximate diameter of the condenser 30 to the lower end is formed,

The cold air control pipe 46b is fixedly assembled at the upper end of the control pipe assembly 42b, the upper end of which is the upper end of the cold air control tube 41b, and the lower end of the upper end of the control accelerator 44. 44a) has a predetermined clearance (CL) and is inscribed, characterized in that the outer surface is composed of a cold air control ring (47b) formed in a downward gradient.

According to the configuration of the cold air control device 40b according to another embodiment of the above configuration,

The cold air control pipe 46b, which is a main component of the secondary cooling air injection means, is fixedly assembled to the cold air control pipe 41b, so that the outer surface of the cold air control ring 47b is inside the upper end of the control accelerator 44. Since the clearance CL formed with the stage 44a is fixed to arbitrary standards, the secondary cooling air air injection amount supplied to the inner wall side of the control acceleration port 44 is also fixed and supplied by arbitrary fixed amounts.

Therefore, the cold air control device 40b of the other embodiment has a clearance CL between the outer surface of the cold air control ring 47b and the inner end 44a of the upper end of the control acceleration hole 44 when applied to any spinning device. ) Is manufactured in accordance with the secondary cooling air injection in the specific spinning conditions to be applied.

Another embodiment of the cold air control device 40b having a fixed size clearance CL as described above has the disadvantage of low versatility because its applicability can be used only for a specific range of radiator, but most radiation facilities and devices In the mass production of one kind of synthetic fiber yarn with hundreds of identical spinning devices, and several hundred cooling control devices with the same characteristics and performances are required, the second cooling air injection amount is controlled. Compared with the manufacturing process, it is easy to manufacture and has mass productivity.

In addition, the components of the cold wind control device of the present invention may be implemented by modifying the standard or shape according to the specifications or characteristics of the radiating device applied.

According to the cold air control method and the cold air control apparatus according to the present invention as described above, the secondary cooling air in the acceleration region of the filament in the spinning process of the thermoplastic synthetic fiber yarn by the melt spinning downward around the inner wall of the control accelerator as the acceleration tube By induction control of the flow of the primary cooling air supplied to the cooling zone to the downward flow by supplying, and effectively controlling the cold air flow in the acceleration region,

Secondary cooling effect is applied to the bundle of filaments discharged downward from the center of the acceleration zone, and at the same time, it adds double speed to the downward flow of the primary cooling air discharged downward with the filament and stabilizes the airflow in the cooling zone. At the same time, the cooling rate and characteristics can be enhanced by suppressing or lowering the generation of cold air rise in the spin tube corresponding to the descent rate of the filament.

In particular, the cold wind control method and control device of the present invention can be applied to the spinning apparatus using the inflow cooling method, it is possible to simply replace the conventional accelerator tube with the cold wind control device of the present invention without changing other components. It is very practical and can effectively reduce turbulent phenomena of primary cooling air that flows in all directions or flows up and down in the porous air filter, and overcomes the limitations of cold air supply and pressure control, and sets the spinning speed at high speed. Can be.

In addition, the present invention has a simple structure, there is almost no breakdown site, it is possible to reduce the operating cost and maintenance cost according to the operation defect repair, the cold wind control pipe which is an important component of cold air injection means is separated easily and quickly from the cold wind control pipe Has the advantage of easy cleaning and replacement

Such characteristics of the present invention ultimately maintain a constant thermal equilibrium in the cooling zone, actively resolve the cutting phenomenon due to the flow of the filament occurred during the solidification process of the filament, and maintain a constant high temperature It prevents the fluctuation of nozzle temperature, which increases the physical properties such as elongation and uniformity of filament, and has the effect of obtaining quality uniformity as a whole.

In addition, due to the improvement of the above characteristics, it is possible to create a spinning condition by setting the spinning speed to a high speed (about 4500m / min), not only to enable high-elongation and high-quality spinning such as microfiber, but also to increase the spinning speed The productivity increase effect can be obtained.

In addition, it has the function of adjusting the spinning speed, the supply amount of cooling air, and the supply speed, which are important variables in setting up the spinning conditions in the spinning equipment and spinning process, so that it is possible to set various spinning conditions in the same spinning equipment. If you want to change the physical properties of synthetic fiber or synthetic polymers, you can effectively accommodate this problem and completely redesign or replace hundreds of cooling packs such as hundreds of cooling devices, nozzles, and spin tubes installed in the production line. In order to solve the problem, it is possible to reduce equipment costs such as redesign, rearrangement, and remanufacturing of the radiator according to the production variety or physical property change, and to reduce the production cost by saving time accordingly.

Claims (6)

In the spinning process of a thermoplastic synthetic fiber yarn by a melt spinning process, a condenser installed at a lower portion of a cooling zone using an inflow type or another type of cooling device, and connected to a lower end of the condenser. Applied to a radiator having an accelerator tube and a conical spin tube connected to the lower end of the accelerator tube, the method includes supplying secondary cooling air downward to the circumference of the inner wall of the accelerator tube. Cold wind control method of a synthetic fiber spinning machine. In the spinning apparatus of a thermoplastic synthetic fiber yarn by a melt spinning process, a condenser provided at a lower portion of a cooling zone using an inflow method or other cooling device, an acceleration tube connected to the lower end of the condenser, and this acceleration It is applied to a spinning device having a conical spin tube connected to the lower end of the tube, the thermoplastic characterized in that it comprises a secondary cooling air injection means for supplying the secondary cooling air downward toward the inner wall circumference of the acceleration tube Cold air control device of synthetic fiber spinning machine. The apparatus of claim 2, wherein the secondary cooling air injection means of the cold air control device is formed by a fixed injection means in which the injection air amount is fixed. The cold air control device of claim 2, wherein the secondary cooling air injection means of the cold air control device includes a control means for adjusting the injected air amount to an arbitrary range. According to claim 2, wherein the cold air control device is a cold air control pipe 41b coupled to the flange joint between the condenser 30 and the spin tube 50, and is fixedly assembled inside the cold air control pipe (41b). Consists of a cold air control device (40b) having a cold air control pipe (46b), The cold air control tube 41b has an upper diameter adjustment tube assembly 42b having a stepped upper end than the inner diameter of the condenser 30 and has a stepped upper end, and in the middle, larger than the diameter of the control tube assembly 42. A control air chamber 43 having a connector 45 for receiving cooling air from the secondary blower 29 is formed in one side end while being formed as a cylindrical chamber of diameter, and the lower side of the inner side of the control air chamber 43 is formed. The control acceleration hole 44 penetrates through the cylindrical hole from the inner diameter and the approximate diameter of the condenser 30 to the lower end is formed, The cold air control pipe 46b is fixedly assembled at the upper end of the control pipe assembly 42b, the upper end of which is the upper end of the cold air control tube 41b, and the lower end of the upper end of the control accelerator 44. 44a) and a cold air control device of the thermoplastic synthetic fiber spinning device, characterized in that it consists of a cold air control ring (47b) inscribed with a predetermined clearance (CL) formed on the outer side downward. According to claim 2, wherein the cold air control device, the cold air control pipe 41 is coupled to the flange joint between the condenser 30 and the spin tube 50, and assembled by screwing the inside of the cold air control pipe 41. Consists of a cold air control device 40 having a cold air control pipe 46 that is, The cold air control tube 41 has an upper diameter adjustment tube assembly 42 having a larger diameter than the inner diameter of the condenser 30 having a female threaded portion 42a, and the diameter of the control tube assembly opening 42 in the middle. A control air chamber 43 having a connector 45 for receiving cooling air from the secondary blower 29 is formed at a side end while being formed as a cylinder chamber of a larger diameter, and a lower side of the control air chamber 43 is formed. A control acceleration hole 44 penetrates through the cylindrical hole from the inner lower end to the lower end with the diameter of the inner diameter and the approximation of the condenser 30 is formed. The cold air control pipe 46 is a flange 48 having a male screw portion 48a fitted by screw assembly to the control pipe assembly 42, which is an upper end of the cold air control pipe 41, and of the flange 48 Thermoplastic synthetic fiber characterized in that it consists of a cold air control ring 47 is extended to the lower end and the inner end (44a) of the upper end of the control accelerator 44 and a predetermined clearance (CL) and the outer surface is formed in a downward gradient Cold air controller of fine yarn spinning equipment.