JPH0737688B2 - Fiber forming pitch melt spinning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention forms a continuous filament fiber from a fiber-forming pitch such as a petroleum pitch, a coal pitch, or a pitch produced as a by-product in the chemical industry. The present invention relates to a melt spinning device.

(Prior Art) Generally, as a device for melt-spinning a fiber-forming pitch, a melt tank for melting the fiber-forming pitch, a defoaming tank for defoaming the melt pitch in a vacuum, a spinning pack for spinning the melt pitch, a melting A device comprising a metering pump (for example, a gear pump) for quantitatively transferring the melt pitch from the tank to the defoaming tank or an extruder and a metering pump for supplying the melt pitch from the defoaming tank to the spinning pack is known.

In a conventional melt-spinning apparatus of this type of fiber-forming pitch, a defoaming tank 1 as shown in FIG. 4 is provided. An overflow groove 2 having a V-shaped cross section and formed in a ring shape along the inner circumference of the defoaming tank 1 is provided at the upper part of the defoaming tank 1, and the defoaming tank 2 is fed from a melting tank (not shown) by a measuring pump. The molten pitch is supplied to the overflow groove 2 through the supply port 3 formed in the upper part of the 1. The molten pitch supplied to the overflow groove 2 overflows over the overflow surface 4 of the overflow groove 2 and falls along the inner wall 5 formed vertically in the defoaming tank 1. Then, since the melt pitch supplied to the overflow groove 2 is supplied from the entire circumference of the overflow surface 4 to the entire circumference of the inner wall 5, the melt pitch becomes a thin film and drops along the inner wall 5.

Thus, the molten pitch is formed into a thin film in the defoaming tank 1, and the inside of the defoaming tank 1 is sucked by a vacuum pump, that is, a large amount of pyrolysis gas generated when the pitch is melted at a high temperature by the thin film defoaming is melted. Can be easily separated from the pitch. As a result, the occurrence of yarn breakage was spun, and the deterioration of the physical properties of the pitch fiber, such as strength, was prevented.

(Problems to be Solved by the Invention) However, in such a conventional fiber-forming pitch melt spinning apparatus, since the melt pitch is supplied to the overflow groove of the defoaming tank through a single supply port, The distance from the supply port varies depending on the position in the overflow groove, and the pressure loss of the molten pitch flowing in the overflow groove varies depending on the position in the overflow groove. It was difficult to make it uniform over the circumference. Moreover, in order to make the overflow groove have a uniform thickness over the entire circumference of the overflow groove, the overflow surface must be kept horizontal. Therefore, when installing the defoaming tank, make sure that the horizontal level is extremely accurate. There was a need. Therefore, there is a problem that the melt pitch does not always become a thin film having a uniform thickness and does not fall on the inner wall of the defoaming tank, and the defoaming effect is reduced.

(Object of the invention) Therefore, according to the present invention, the plate is provided with a communicating groove, a radial groove and an annular groove for guiding the molten pitch supplied from the supply port to the guide member, and the guide member is guided to the inner wall side of the defoaming tank. By providing a receiving surface for receiving the melted pitch formed by the annular groove, the molten pitch supplied from the annular groove to the guide member is formed into a thin film so that the flow velocity and the thickness thereof are uniform over the entire circumference of the annular groove. Aim to improve the defoaming effect by maintaining the uniform thickness of the defoaming tank even when descending along it, without having to consider the horizontal level of the defoaming tank with high accuracy when installing the defoaming tank. I am trying.

(Means for Solving Problems) In order to achieve the above-mentioned object, the melt-spinning apparatus for fiber-forming pitch according to the present invention is designed to degas the melt pitch in a defoaming tank and spin it by a spinning pack. In the melt spinning apparatus, a supply port formed at an upper end portion of the defoaming tank and supplied with a melt pitch, and a communication port attached to an upper surface in the defoaming tank and communicating with the supply port through which the melt pitch passes. A plate having a groove formed therein, a plurality of radial grooves provided in the plate, radially extending from the outer periphery of the communication groove, and passing through the melting pitch, and communicating with the extending direction end portion of the radial groove. And an annular groove that is formed to extend in an annular shape and that opens downward toward the defoaming tank and that supplies the molten pitch that has passed through a plurality of radial grooves into the defoaming tank, and that is provided below the plate. Is it an annular groove? A guide member for guiding the molten pitch supplied from the defoaming tank toward the inner wall side, and a defoaming device provided along the peripheral surface of the inner wall of the defoaming tank and receiving the molten pitch supplied from the guide member. At least one receiving surface for lowering below the tank;
Is equipped with.

(Operation) Since the plate is provided with the communication groove, the radial groove and the annular groove for guiding the molten pitch supplied from the supply port to the guide member, the molten pitch supplied from the annular groove to the guide member becomes a thin film shape. The flow velocity and the thickness are made uniform over the entire circumference of the annular groove.

In addition, since at least one receiving surface that receives the molten pitch supplied from the guide member and descends below the defoaming tank is provided along the peripheral surface of the inner wall of the defoaming tank, a thin film is formed from the annular groove. The extruded molten pitch descends along the receiving surface while maintaining its thickness uniform.
Therefore, the defoaming effect is improved without having to consider the horizontal level of the defoaming tank with high accuracy when installing the defoaming tank.

(Example) Hereinafter, the present invention will be described with reference to the drawings.

1 and 2 are diagrams showing a first embodiment of the present invention.

In FIG. 1, 10 is a vacuum defoaming tank, and the vacuum defoaming tank 10 includes a main body 11 in which a cylindrical inner wall 13 is formed.
And a lid 12 that closes the opening at the top of the body 11. The lid 12 of the vacuum defoaming tank 10 has a supply port 14 for introducing a molten pitch supplied from a melting tank (not shown) through a metering pump (or an extruder) into the main body 11, and a nitrogen gas in the main body 11 A suction port 16 is formed which communicates with a nitrogen introduction port 15 introduced into the chamber and a vacuum pump to suck the pyrolysis gas of the molten pitch generated in the main body 11. Vacuum defoaming tank 10
A spinning pack 18 is provided below the vacuum defoaming tank 10
A measuring pump 17 for transferring the molten pitch in the vacuum defoaming tank 10 to the prevention pack 18 is interposed between the spinning pack 18 and the spinning pack 18. The spinning pack 18 is composed of a main body 19 and a straightening plate 20, a collecting plate 21, and a spinneret 22 which are sequentially housed inside the main body 19.

Reference numeral 23 denotes a disk-shaped first plate attached to the lower surface of the lid 12 of the vacuum degassing tank 10, and a disk-shaped second plate is provided on the lower surface of the first plate 23 via a disk-shaped liner plate 24. Plate 25 is attached. Therefore, the first plate 23
The lower surface 23a of the second plate 25, the upper surface 25a of the second plate 25, and the outer peripheral surface 24a of the liner plate 24 define a gap 26 substantially continuously in the circumferential direction. The width W of the gap 26 shown in the figure is equal to the thickness of the liner plate 24, and for example, W = 0.02 to 0.05 mm is preferable. Further, the first plate 23 and the liner plate 24 described above form the plates referred to in the claims.

As shown in FIG. 2, on the lower surface 23a of the first plate 23,
A circular groove (communication groove) 27 that is formed in the central portion and communicates with the supply port 14, a plurality of radial grooves 28 radially formed from the outer periphery of the groove 27, and tip portions of the radial grooves 28 (extending direction ends). ) Are communicated with each other, and a ring-shaped groove (chamber portion) as an annular groove that opens downward in the defoaming tank 10.
29 are provided. The inner diameter of the ring-shaped groove 29 is equal to the outer diameter of the liner plate 24, and the groove 27 and the radial groove
Each of the 28 openings is closed by a liner plate 24. In addition, a center hole 31 is formed in the center of the first plate 23, and a lid is provided through the center hole 31.
The twelve supply ports 14 and the groove 27 of the first plate 23 communicate with each other (see FIG. 1).

Referring again to FIG. 1, a conical inclined surface 25b is formed on the outer periphery of the second plate 25 so as to be narrowed upward in the drawing.
That is, the second plate 25 constitutes a guide member,
Defoaming tank 10 for melting pitch supplied from ring-shaped groove 29
It guides toward the inner wall 13 of the. on the other hand,
On the upper part of the defoaming tank 10, an inclined surface 32 as a receiving surface is provided as an inner wall 13
Is provided along the peripheral surface of the
It is inclined downward from the center axis of the defoaming tank 10 from a position substantially facing the terminal end of b. And the supply port of the groove 12
14, the melting pitch supplied through the center hole 31, the groove 27, the radial groove 28 and the ring-shaped groove 29 of the first plate 23 is the second.
When being guided and lowered along the inclined surface 25b from the entire circumference of the plate 25, the inclined surface 32 functions as a receiving surface supplied from the second plate 25, and the melting pitch is distributed over the entire circumference of the inclined surface 32. To form a thin film having a uniform thickness and descend along the inner wall 13. That is, the slit 26 has a function of providing a uniform velocity distribution by using the discharge pressure of the metering pump that supplies the molten pitch to the vacuum degassing tank 10.
It has the function of forming a thin film with a uniform thickness over the entire circumference.

Here, the depth of the chamber groove and the depth D of the radial groove 28 shown in FIG. 1, the width A of the ring-shaped groove 29, the width B of the radial groove 28, and the number of the radial grooves 28 shown in FIG. N is, for example, D = 1. To supply the molten pitch from the chamber portion to the slits 26 uniformly and optimize the function of the slits 26.
It is preferable to set 5 to 3 mm, A = 2 to 4 mm, B = 2 to 4 mm, and N = 8 to 16.

An external heater (not shown) is provided on the outer wall of the main body 11 of the vacuum defoaming tank 10, and the inside of the vacuum defoaming tank 10 is constantly maintained at a softening point of the pitch or higher by heating by this heating heater. The defoaming operation of the tank 10 is not disturbed.

Next, the operation will be described.

In FIG. 1, first, the vacuum defoaming tank 10 has a suction port 16 inside.
Vacuum degassing tank, which is sucked by vacuum pump through
The inside of 10 is evacuated to, for example, 10 to 260 Torr, and subsequently nitrogen gas is introduced into the vacuum degassing tank 10 through the nitrogen inlet 15. Such operation is repeated 2-3 times. Next, while the pitch melted in the melting tank is measured by a constant amount by a transfer means such as a gear pump,
It is supplied to the center hole 31 through the supply port 14. The molten pitch supplied to the center hole 31 is radially extruded from the groove 27 by the radial groove 28, passes through the gap 26 through the ring-shaped groove 29, and descends along the inclined surface 25b of the second plate 25.
At this time, as described above, the gap is passed through the ring-shaped groove 29.
Since the molten pitch that has passed through 26 has a uniform velocity distribution and uniform thickness, the molten pitch that descends along the inclined surface 25b is
The thin film having a uniform thickness is formed over the entire circumference of the first plate 23 and flows down along the inclined surface 32 and the inner wall 13.

During this period, since the vacuum pump is constantly operated and the inside of the vacuum degassing tank 10 is always kept in vacuum, the bubbles of the decomposition gas contained in the molten pitch are almost completely removed.
Then, the melt pitch that has been continuously degassed in a thin film in a vacuum is weighed by the metering pump 17 in a constant amount, and the spinning pack 18
The melted pitch, which is supplied to the spinneret and is spun from the spinneret 22 of the spin pack 18, is discharged, and is further wound at a constant speed by a winding means separately provided. In order to prevent yarn breakage during spinning and generation of voids in the fiber, it is necessary to continuously perform thin film defoaming in a vacuum of the melt pitch during spinning.

Thus, the first plate 23 and the liner plate 24
The melted pitch supplied from the supply port 14 to the second plate
Since the groove 27, the radial groove 28, and the ring-shaped groove 29 for guiding 25 are provided, and the inclined surface 32 for receiving the melting pitch guided by the second plate 25 is provided above the inner wall 13 of the defoaming tank 10. The molten pitch passing through the gap 26 can be made into a thin film so that its flow velocity and thickness can be made uniform over the entire circumference of the gap 26,
At the same time, it is possible to increase the defoaming surface area by forming the molten pitch descending along the inclined surface 32 into a thin film having a uniform thickness. As a result, the defoaming effect can be improved without having to consider the horizontal level of the vacuum defoaming tank 10 with high accuracy when the vacuum defoaming tank 10 is installed.

FIG. 3 is a diagram showing a second embodiment of the present invention.

In this embodiment, a plurality of inclined surfaces are provided in the vacuum degassing tank 10 instead of the inclined surface 32 and the inner wall 13 shown in FIG.
The passing area of the molten pitch that has exited the gap 26 through 29, that is, the defoaming surface area is increased, and the defoaming effect of the vacuum defoaming tank 10 is further improved.

In FIG. 3, reference numeral 40 denotes a column portion vertically provided in the main body 11 of the vacuum defoaming tank 10, and the lower end of the column portion 40 is a leg portion.
It is fixed to the bottom of the main body 11 via 41. The column portion 40 includes a plurality of conical inclined plates that are squeezed downward in the figure.
42 and multiple conical tilt plates squeezed upwards
43 are alternately arranged from the upper portion of the pillar portion 40. The upper end surface 42a and the lower end surface 42b of the inclined plate 42 are the second plate 25.
The outer peripheral surface of the upper end surface 42a is provided in contact with the inner wall 13 in parallel with the upper surface 25a. Further, in the inclined plate 43, the upper end surface 43a and the lower end surface 43b of the inclined plate 43 are the second plate 25.
The outer diameter of the upper end surface 43a is smaller than the inner diameter of the lower end surface 42b of the inclined plate 42, and the outer diameter of the lower end surface 43b is smaller than the inner diameter of the upper end surface 42a of the inclined plate 42. And is formed to be larger than the inner diameter of the lower end surface 42b. Furthermore, a pair of inclined plates
42 and 43 are provided such that the lower end surface 42b and the upper end surface 43a are aligned in the vertical position.

The inclined surface 42c formed along the inner circumference of the inclined plate 42 and the inclined surface 43c formed along the outer circumference of the inclined plate 43 are alternately inclined in the opposite direction with respect to the horizontal plane, and are sequentially passed through the ring-shaped groove. It has a function as a receiving surface that receives the molten pitch that has passed through the gap 26, forms the molten pitch into a thin film and defoams. The other structure and operation are similar to those of the first embodiment shown in FIG.

As described above, in this embodiment, the melt pitch passing through the gap 26 through the ring-shaped groove and descending along the inclined surface 25b of the second plate 25 has a uniform thickness along the plurality of inclined surfaces 42c and 43c. Since it descends sequentially while forming a thin film,
The defoaming surface area in the molten pitch vacuum degassing tank 10 is significantly increased. Further, since the inclined surfaces 42c and 43c are alternately formed with an inclination in the opposite direction, the molten pitch formed in a thin film and descending is alternately defoamed from the front and back surfaces, and the defoaming inside the vacuum defoaming tank 10 is performed. The foam effect is significantly improved.

(Effect) According to the present invention, since the plate is provided with the communication groove, the radial groove and the annular groove for guiding the molten pitch supplied from the supply port to the guide member, the molten metal supplied from the annular groove to the guide member is provided. The pitch can be formed into a thin film, and the flow velocity and the thickness can be made uniform over the entire circumference of the annular groove. Further, since at least one receiving surface that receives the molten pitch supplied from the guide member and descends below the defoaming tank is provided along the peripheral surface of the inner wall of the defoaming tank, the thin film is formed from the annular groove. The molten pitch extruded in the above can be lowered along the receiving surface while maintaining the state where the thickness is made uniform.

[Brief description of drawings]

FIGS. 1 and 2 are views showing a first embodiment of a melt-spinning apparatus for fiber-forming pitch according to the present invention. FIG. 1 is a longitudinal sectional view of a defoaming tank and a spinning pack, and FIG. Figure II
-II line arrow view, FIG. 3 is a cross-sectional view of the essential part of the defoaming tank showing a second embodiment of the fiber-forming pitch melt-spinning apparatus according to the present invention, and FIG. It is a longitudinal cross-sectional view of the defoaming tank showing the pitch melt spinning apparatus. 10 …… Vacuum defoaming tank (defoaming tank), 13 …… Inner wall, 14
…… Supply port, 23 …… First plate (plate), 24 ……
Liner plate (plate), 25 …… second plate (guide member), 27 …… groove (communication groove), 28 …… radiation groove, 29 ……
Ring-shaped groove (annular groove), 32, 42c, 43c …… Sloping surface (receiving surface).

Claims (1)

[Claims] 1. A melt-spinning apparatus for a fiber-forming pitch, wherein a melt pitch is defoamed in a defoaming tank and spun by a spinning pack, wherein the melt pitch is supplied at the upper end of the defoaming tank. A port, a plate attached to the upper surface in the defoaming tank, and formed with a communication groove communicating with the supply port and through which the molten pitch passes, and provided in the plate and extending radially from the outer periphery of the communication groove. A plurality of radiating grooves that are present and through which the molten pitch passes, and are formed so as to extend in an annular shape so as to communicate with the ends of the radiating grooves in the extending direction, and open toward the bottom of the defoaming tank, An annular groove for supplying the molten pitch that has passed through a plurality of radial grooves into the defoaming tank, and a guide provided below the plate for guiding the molten pitch supplied from the annular groove toward the inner wall side of the defoaming tank. Member and A fiber formation, comprising: at least one receiving surface which is provided along the peripheral surface of the inner wall of the tank, and which receives the molten pitch supplied from the guide member and descends below the defoaming tank. Melt spinning equipment for natural pitch.