JPH0639727B2 - Spinning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION {Industrial field} The present invention relates to the fact that a yarn is melt-spun in a spinning cylinder held in a depressurized state by an atmospheric pressure portion of the outside air, cooled and solidified, and then the yarn is exposed to the outside air. The present invention relates to a spinning device that leads to a pressure section.

{Prior Art} A technique for guiding a melted and discharged yarn into an atmosphere kept in a reduced pressure state from an atmospheric pressure section has already been disclosed in Japanese Patent Publication No. 57-820.
It is known from publication No. 6.

The publication discloses an example of a spinning tube having a yarn outlet portion consisting of a decompression chamber partitioned by a multi-stage orifice in the vicinity of the bottom of the spinning tube in order to maintain a high degree of vacuum in the spinning tube. .

{Problems to be solved by the invention} However, in the case of the above-mentioned conventional technique, the yarn spun from the spinneret discharge hole is not bundled, and the single yarn of the yarn is in a separated state, and the decompression of the yarn outlet is performed. Since the multi-stage orifices that partition the chamber can be passed, the opening area of the orifice becomes large, and it is extremely difficult to maintain a high depressurized state in the spinning cylinder.

Further, in the above-mentioned conventional technique, since the opening area of the orifice is large, the inflowing air increases, and the yarn is swayed and becomes unstable near the decompression chamber and the upstream portion of the orifice located in the uppermost flow path. Single filament yarn comes into contact with each orientation, friction deterioration, and in severe cases, single yarn breakage occurs, and the resulting yarn has a problem that mechanical properties such as strength and elongation are significantly impaired. .

Furthermore, since the entanglement between the single yarns causes unstable behavior, troubles such as yarn breakage occur, and stable operation cannot be continued.

Therefore, in the prior art, it was not possible to increase the degree of pressure reduction in the spinning tube.

This is also clear from the fact that, as described in the examples of the publication, under proper conditions, only reduced pressure spinning with a water column of at most 200 cm is possible.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and in a spinning device in which a spinning cylinder held under a reduced pressure from an outside atmospheric pressure section is provided immediately below a spinneret, the inside of the spinning cylinder is conventionally It is possible to maintain a decompressed state which is extremely higher than that of the technique, does not cause deterioration and damage of the yarn spun by the spinneret at the yarn outlet provided at the lower end of the spinning tube, and has a large degree of reduced pressure. It is intended to provide a spinning device capable of performing stable spinning even under conditions.

{Means for Solving the Problems} A structure of the present invention for achieving the above object is to surround a periphery of a spinneret and extend at least up to a solidification point of the thread along a thread spun from the spinneret. A spinning cylinder having a yarn outlet portion fluidly sealed at a lower end thereof; a depressurizing unit connected to the spinning barrel for maintaining the inside of the spinning barrel in a depressurized state than an outside air atmosphere; A spinning device comprising: a take-out means for pulling the yarn from the outlet to the outside; (a) The yarn outlet is provided with a tubular member, and a column that is detachably inserted into the tube of the tubular member. A thin plug having a narrow cross-sectional area through which the yarn can pass substantially along the axis on the outer peripheral surface of the columnar plug and / or the inner peripheral surface of the cylindrical member facing the columnar plug. A groove is formed, and (b) an opening is formed in the narrow groove and the yarn runs. At least one pressure adjusting chamber provided along the direction for adjusting the pressure difference between the outside air atmospheric pressure and the spinning cylinder internal pressure in a stepwise manner, and a communication passage communicating between the pressure adjusting chamber and the pressure reducing means. And a pressure adjusting means for the yarn outlet is provided.

{Example} Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic vertical sectional view of a typical embodiment of a spinning device according to the present invention, and FIG. 2 is a view of the yarn outlet of the spinning device of FIG. FIG. 3 shows B- in FIG.
FIG.

In the figure, reference numeral 1 is a spinneret having a plurality of ejection holes 2, which is housed in a spinning pack 3. Below the spinning pack 3, a tubular spinning tube 6 having a fixed length is provided via a heat insulating tube 4, and is fixed integrally with the spinning pack 3 with a bolt 5.

At the bottom of the spinning cylinder 6, a yarn outlet of a yarn Y having the following structure is formed. By sealing the inside of the spinning cylinder 6 at this portion, a closed space s can be formed inside the spinning cylinder. Has been

That is, the ring-shaped rubber 15,
A hollow cylindrical member 16 having a narrow groove 25 along the longitudinal direction of the spinning tube 6 is inserted, and a flange 17 is attached to the bolt 17 from below.
By fixing with, it is prevented from falling off.
Further, the hollow cylindrical member 16 is provided with a rubber plug 2 having a cylindrical plug 19 having an outer diameter slightly smaller than the inner diameter of the hollow cylindrical member 16.
It is fixed to the flange 17 with a bolt 27 via 6. Further, the columnar plug 19 is provided with a space that opens to the narrow groove 25 along the circumferential direction of the outer peripheral surface thereof, that is, pressure regulating chambers 20 and 21, and the inside of the columnar plug 19 is provided. The pressure regulating chambers 20 and 21 and the cylindrical plug 19
A hole 29, which is a communication passage communicating with the vacuum pump 10, is formed in the closed space s of the spinning tube 6 on the upper surface, and the throttles 22 and 23 are arranged in the middle of the hole 29.

Therefore, the thin groove 25 formed by the hollow cylindrical member 16 and the cylindrical plug 19 and the pressure adjusting chamber 2 are provided from directly below the base 1.
The space s reaching the yarn outlet portion composed of 2, 23 can be made extremely tight.

On the other hand, on the inner wall surface of the spinning tube 6 forming the closed space s,
A connecting pipe 8 connected to the vacuum pump 10 is provided, and the inside of the spinning cylinder is kept in a reduced pressure state by the outside air atmospheric pressure section. Further, a vacuum gauge 7 is further mounted on the inner wall of the spinning cylinder forming the sealed space s, the vacuum gauge 7 detects the degree of pressure reduction in the closed space s, and the controller 9 outputs a detection signal of the degree of pressure reduction.
Then, the vacuum pump 10 is controlled by the controller 9 so that a predetermined pressure reduction degree is achieved.

In the above-described embodiment, the closed space s is depressurized from the atmospheric pressure section using the vacuum pump 10, but a suction device such as a blower may be used instead of the vacuum pump 10.

Further, regarding the shape of the narrow groove 25, as in the present embodiment,
The shape is not limited to a rectangle or a square, and any shape such as a triangle, a circle, and an ellipse can be selected. However, it is desirable that the cross-sectional area of the fine groove 25 is set to a minimum area that allows the bundled yarns to pass therethrough.

Further, it is desirable that the hollow cylindrical member 16 and the columnar plug 19 that form the narrow groove 25 be made of a material, such as a ceramic, that minimizes damage to the yarn.

Furthermore, the cross-sectional shape of the hollow cylindrical member and the cylindrical plug is
The shape is not limited to a circular shape as in the present embodiment, but may be an arbitrary shape including a polygon such as a triangle. The point is that a narrow groove is formed by inserting an arbitrary columnar plug. It is essential that

On the other hand, in the above embodiment, the narrow groove 2 through which the yarn is passed.
Although 5 is provided on the hollow cylindrical member 16 side, it may be provided on the cylindrical plug 19 side, or may be provided on both the hollow cylindrical member 16 and the cylindrical plug 19.

Further, the hollow cylindrical member 16 does not necessarily have to be removable from the spinning tube 6 as in the present embodiment, and the spinning tube 6 is not necessarily required.
It may be an integral structure with. Furthermore, there is no problem if the columnar plug is directly inserted into the inner wall of the spinning tube 6 to form the fine groove.
At that time, it is desirable that only the portion of the inner wall of the spinning tube through which the yarn passes is made of a material different from that of the inner wall such as ceramic.

{Operation} Next, the operation of the present invention will be described based on the apparatus of the above embodiment.

The yarn Y melt-spun from the discharge hole 2 of the spinneret 1 is prepared outside the spinning tube 6 with the columnar plug 19 removed first and an opening provided at the lower end of the spinning tube 6 (not shown). It is taken up by the suction gun (not shown).

Then, next, the yarn is guided to a groove 24 provided in the hollow cylindrical member 16 above the fine groove 25 so as to face the traveling yarn Y and having a shape substantially the same as that of the fine groove 25 (see B in FIG. 3). -B sectional view), and further, the suction gun is moved so that the yarn Y follows the narrow groove 25 provided on the inner peripheral surface of the hollow cylindrical member 16 to form a yarn path, and then the cylindrical plug 19 Is mounted in the hollow cylindrical member 16 and fixed to the spinning tube 6 with a bolt 27.

At this time, it is desirable that the gap between the hollow cylindrical member 16 and the cylindrical plug 19 be as small as possible within a range where it can be inserted and removed.

In this way, the yarn Y led out from the yarn outlet portion at the lower end of the spinning tube 6 is rotated at a constant speed in the same procedure as in the ordinary spinning, that is, after the oil supply is applied by the guide oil supply device 14. It is wound around the bobbin 35 of the winder 34 through the first godet roll 30 and the second godet roll 31.

In this embodiment, the tension detector 32 is arranged between the second godeye roll 31 and the winder 34, and the tension detector 32 is arranged.
Detects the winding tension of the yarn Y, inputs the detected tension value to the controller 33, and controls the bobbin rotation speed of the winding machine 34 by the controller 33 so that the winding tension becomes constant. It is like this.

At this time, the yarn outlet located between the closed space s held at a predetermined degree of reduced pressure and the ambient atmospheric pressure portion has a conduit resistance of the minute fine groove 25 perforated so that the yarn can pass through. Due to the pressure loss due to, a substantially fluid-sealed state is achieved.

Therefore, the amount of air flowing into the spinning tube from the narrow groove 25 is extremely small, vibration such as yarn shaking hardly occurs, and the yarn passes through the narrow groove 25 in a converged state. Therefore, as compared with the case where the yarn single yarn is guided in the yarn outlet portion in a loose state, it is much stronger against the disturbance of the air flow, and the yarn path becomes extremely stable.

However, as described above, it is possible to achieve a very high degree of pressure reduction in the spinning cylinder by using the yarn outlet portion provided with the minute fine grooves through which the yarn can pass. When the degree of decompression is high, air expansion and pulsation due to the pressure difference between the outside atmospheric pressure part and the decompression chamber occur near the yarn outlet entry side of the decompression chamber, causing the yarn to sway and become unstable. ,
The problem that single yarns come into contact with the yarn outlet, frictional deterioration, and in severe cases, single yarn breakage occurs, and mechanical properties such as strength and elongation of the obtained yarns are significantly impaired. It turned out to give rise to points.

That is, when the atmospheric pressure in the spinning cylinder is suddenly reduced to about half the atmospheric pressure, the flow velocity of the air flowing into the spinning cylinder from the yarn outlet reaches the sonic velocity, and the spinning speed is higher than this critical pressure. When the pressure in the cylinder is increased, the yarn pressure does not drop to the critical pressure at the yarn outlet, and air expansion and pulsation due to the difference between the critical pressure and the atmospheric pressure of the spinning cylinder occurs near the yarn outlet. There was found.

In such a situation, the yarn single yarns are violently expanded and vibrated, and the yarn single yarns are instantly entangled with each other to cause yarn breakage, which makes it extremely difficult to perform spinning.

In order to avoid this, the present inventors have found that the degree of pressure reduction at the yarn outlet is changed stepwise.

In order to solve the above problems, the present invention provides a cylindrical plug 19
Spaces that open to the narrow groove 25, that is, the pressure adjusting chambers 20 and 21 are provided along the circumferential direction of the outer peripheral surface of the.

That is, the structure of the device of the present invention is such that even when the closed space s is spun at a reduced pressure higher than the critical pressure (Pc), the pressure regulating chambers 20 and 21 provided in the narrow groove and the closed space s are opened.
Diaphragms 22 and 23 arranged in the middle of a hole 29 connecting
By adjusting the pressure of the pressure regulating chambers 20 and 21, stable winding is possible.

This point will be described below. In this embodiment, first, the pressure (P2) in the pressure regulating chamber 21 is adjusted by the throttle 23 so that the air flowing from the outside atmospheric pressure portion into the pressure regulating chamber 21 does not expand or pulsate.
Similarly, the pressure (P1) in the pressure adjusting chamber 20 is adjusted by the throttle 22 so that the air flow generated by the pressure difference between the pressure adjusting chambers 20 and 21 does not expand or pulsate. Then, the pressures in the pressure regulating chambers 20 and the closed space s are finally reduced (P0) by gradually decreasing the pressures in the pressure regulating chambers.
The pressure difference between and is sufficiently small to prevent the expansion and pulsation of the air flowing into the closed space s.

FIG. 4 is a pressure distribution diagram at the yarn outlet of the device without the pressure regulating chamber, and FIG. 5 is a pressure distribution diagram at the yarn outlet of the device according to the present invention having the pressure regulating chamber. .

As shown in FIG. 4, in a device in which the pressure regulating chambers 20 and 21 are not provided, when the degree of pressure reduction in the closed space s is made larger than the critical pressure (Pc), a pressure difference is created at once with the atmospheric pressure part of the outside air, and as a result, At the yarn outlet, the pressure drops only to the critical pressure, and expansion of air occurs due to the pressure difference between the critical pressure and the closed space s.

However, in the case where the pressure regulating chamber is provided as in the device of the present invention, the pressure of the pressure regulating chamber provided by opening the fine groove at the yarn outlet is shown in FIG. The air that flows into the closed space s from the pressure regulation chamber and each pressure regulation space from the outside atmospheric pressure portion, and further from the pressure regulation chamber located in the most upstream is adjusted by lowering the pressure in a stepwise manner. The expansion and pulsation of the air can be minimized and the disturbance of the air flow can be suppressed.

Furthermore, since the yarn outlet is substantially sealed by the resistance of the narrow groove, even if the closed space s is set under a high decompression, the amount of inflowing air is small and the adjustment is not performed. Even in the pressure chamber, since the yarns are passed in a bundled state, unstable behavior such as vibration of the yarns hardly occurs.

Although two pressure adjusting chambers are provided in the above-described embodiment, the present invention is not limited to this, and if they are provided in multiple stages, it is possible to perform spinning under high reduced pressure. However, depending on the conditions, one step may be sufficient. When spinning at a low degree of reduced pressure, the throttle may be removed, or a blind plug may be used instead of the throttle. Furthermore, there is no problem even if the pressure in the decompression chamber is decreased successively.

Further, regarding the pressure adjusting method of the pressure adjusting chamber, in the embodiment,
The small hole diameter of the diaphragm 23 is made smaller than that of the diaphragm 22,
Although the one based on the difference in the conduit resistance due to the difference in the diameter of the small holes was used, the invention is not limited to this, and the difference in the conduit resistance due to the difference in the length of the small holes may be used. Alternatively, for example, the diaphragm amount may be variably adjustable. What is essential is that the pressure in each pressure regulating chamber can be set to a predetermined value.

FIG. 6 shows another embodiment according to the present invention, and FIG. 7 is a view taken along the line CC of FIG.

6 and 7, a groove 25 is provided along the axis of the outer peripheral surface of the cylindrical plug 19, and the cylindrical plug 19 is provided with a flange 17 and a bolt 1 via an elastic body 15 such as rubber.
The pin 38 is attached to the hollow cylindrical member 16 fixed to the spinning cylinder 6 at 8.
It is locked with.

The pressure regulating chambers 20 and 21 and the throttles 22 and 23 are provided on the hollow cylindrical member 16 side, and small holes 36 and 37 passing through the pressure regulating chambers 20 and 21 and the outside air normal pressure portion are independently installed. There is. The vacuum pump 10 and the throttles 22 and 23 that set the degree of pressure reduction in the closed space s sequentially reduce the pressure in the pressure control chambers 20 and 21.

In the present embodiment, the pressures of the pressure regulation chambers 20 and 21 are adjusted by the single shared vacuum pump 10 using the throttles 22 and 23. However, when the small holes 36 and 37 are opened to the outside air atmospheric pressure portion. A vacuum pump or a suction device such as a blower may be directly installed in each. In this case, the diaphragm 2
Needless to say, the pressure in the decompression chamber can be adjusted by the suction device without providing the units 2 and 23.

Further, when spinning a plurality of yarns, the yarn passage grooves (fine grooves) formed by the columnar plug and the hollow cylindrical member may be provided by the corresponding number of yarns.

{Effect of the Invention} The present invention has the following excellent effects by adopting the configuration as described above.

Since the thin groove is formed by the removable columnar plug and the yarn bundled into one thread is guided to the outside air atmospheric pressure portion through the thin groove, the spinning tube has a very excellent sealing property.

Therefore, the amount of air flowing into the spinning cylinder from the outside air atmospheric pressure part is small, and yarn swaying or the like hardly occurs,
As a result, troubles such as yarn breakage can be eliminated, and productivity can be improved.

Further, since the yarn outlet section is provided with pressure adjusting means for stepwise adjusting the pressure change in the outside air atmospheric pressure section and the spinning tube, even if the atmospheric pressure in the spinning tube is kept lower than the critical pressure, The pressure in the pressure chamber can be gradually lowered and set to the optimum condition, and the expansion of air, the swaying of the yarn due to pulsation, and the vibration can be controlled.

Further, since the yarns pass through the narrow grooves while being bundled into one, the yarns are stable even against disturbance of the flow in the spinning tube, and the above effect is further promoted.

[Brief description of drawings]

FIG. 1 is a schematic view showing a typical embodiment of a spinning device according to the present invention, and FIG. 2 is a view of the yarn outlet section AA of the spinning device of FIG. FIG. 3 is a sectional view taken along the line BB of FIG. FIG. 4 is a pressure distribution diagram at the yarn outlet of the device without the pressure regulating chamber, and FIG. 5 is a pressure distribution diagram at the yarn outlet of the device according to the present invention having the pressure regulating chamber. . FIG. 6 is a schematic view of a yarn outlet portion showing another embodiment of the spinning device according to the present invention, and FIG. 7 is a CC of FIG.
FIG. Explanation of symbols in the drawings 1 ... Spinner, 2 ... Discharge hole 3 ... Spinning pack, 4 ... Insulation cylinder 5, 18, 27 ... Bolt 6 ... Spinning cylinder, 7 ... Vacuum gauge 8 ... Connection Pipe, 9 ... Controller 10 ... Vacuum pump 11 ... Joint, 12 ... Branch joint 13 ... Piping, 14 ... Oil supply device 15, 26 ... Rubber, 16 ... Hollow cylindrical member 17 ... Flange, 19 ...... Cylindrical plug 20, 21 ...... Pressure regulation chamber, 22, 23 ...... Restrictor 24 ...... Groove, 25 ...... Fine groove 28 ...... Notch, 29 ...... Hole 30 ...... 1st Gode roll 31 ...... 2 Godie roll 32 ... tension detector, 33 ... controller 34 ... winding machine, 35 ... bobbin 36, 37 ... small hole, 38 ... pin

Claims (1)

[Claims] 1. A method of enclosing a periphery of a spinneret and extending at least up to a solidification point of the spine along a thread spun from the spinneret,
A spinning cylinder having a yarn outlet portion fluidically sealed at a lower end thereof, a decompressing unit connected to the spinning barrel and maintaining the inside of the spinning barrel in a reduced pressure state than the outside air atmosphere, and a yarn outlet of the spinning barrel. And a take-up means for taking the yarn out of the tubular part to the outside. (A) A tubular member at the yarn outlet, and a columnar plug which is detachably inserted into the tubular member. And a narrow groove having a narrow cross-sectional area on the outer peripheral surface of the columnar plug and / or the inner peripheral surface of the tubular member facing the columnar plug so that the yarn can pass substantially along the axis. And (b) at least adjusting the pressure difference between the atmospheric pressure of the outside air and the pressure inside the spinning cylinder, which is provided in the narrow groove and along the traveling direction of the yarn, at least in stages. It consists of a single-stage pressure regulation chamber and a communication passage that connects the pressure regulation chamber and the pressure reducing means. A spinning device characterized in that a pressure adjusting means for the yarn outlet is provided.