CN218436039U - Large-tow polyimide fiber dry spinning channel - Google Patents

Abstract

The utility model provides a pair of big silk bundle polyimide fiber dry spinning corridor. The spinning channel comprises a channel body, an air inlet pipe, two first pore plates, two second pore plates and two annular spinneret plates, wherein the channel body is divided into an upper channel, a middle channel and a lower channel from top to bottom, the upper channel, the middle channel and the lower channel are sequentially communicated, the top end of the upper channel and the bottom end of the lower channel are both closed, a filament outlet is formed in the bottom end of the lower channel, a polyimide solution is sprayed out from the annular spinneret plate positioned at the top end of the upper channel to form a raw liquid trickle, hot air of the air inlet pipe is uniformly blown to the raw liquid trickle through the first pore plates, and heating heat preservation layers of the upper channel, the middle channel and the lower channel can adjust corresponding temperatures according to process requirements, so that a solvent in the large raw liquid trickle can be timely evaporated out, the filaments are rapidly solidified, thereby reducing doubling between filament bundles and realizing the spinnability and stability of the large filament bundles. The device is adopted to produce the polyimide fiber large tows, and the yield can be improved by at least 15 times.

Description

Large-tow polyimide fiber dry spinning channel

Technical Field

The utility model relates to a polyimide fiber spinning technical field especially relates to a big silk bundle polyimide fiber dry spinning corridor.

Background

In the process technology of large tows of polyimide fibers in a dry spinning method, a spinning channel is very important equipment, the spinning yield of the channel used at present is low, one channel position only can spin 168 Kong Sishu due to the structural limitation of the spinning channel used at present, polyimide spinning raw liquor enters the spinning channel through a spinneret plate in the spinning process of polyimide, heated gas is blown into the channel, the solvent can have a flash evaporation phenomenon, but for large tow spinning, the traditional spinning channel generally adopts a cross-flow type blowing mode, the wind-receiving surface of the large tows is uneven, the solvent cannot be evaporated in time, the large tow production cannot be carried out, doubling and the like are easily formed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a big silk bundle polyimide fibre dry spinning corridor to the above-mentioned not enough of prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a large-tow polyimide fiber dry spinning channel, which comprises a channel body, an air inlet pipe, two first pore plates, two second pore plates and two annular spinneret plates;

the channel body is divided into an upper channel, a middle channel and a lower channel from top to bottom, the upper channel, the middle channel and the lower channel are sequentially communicated, the top end of the upper channel and the bottom end of the lower channel are sealed, and a yarn outlet is formed in the bottom end of the lower channel;

one end of the air inlet pipe is inserted into the upper channel and is closed; two openings are respectively formed in two side walls of the air inlet pipe, two first pore plates are respectively arranged at the openings, two second pore plates are arranged in the upper channel and positioned on two sides of the air inlet pipe, the second pore plates and the first pore plates positioned on the same side are arranged at intervals to form a spinning channel, and two annular spinneret plates are arranged at the top end of the upper channel, positioned on two sides of the air inlet pipe and corresponding to the spinning channel;

the two second pore plates and the inner walls of the two sides of the upper channel are respectively arranged at intervals to form two air return channels, and a first air return outlet communicated with the air return channels is arranged on the side wall of the top of the middle channel;

the diameter of the lower shaft is larger than that of the middle shaft, a shoulder is formed at the joint of the lower shaft and the middle shaft, two air inlets are arranged on the shoulder, the two air inlets are symmetrical about the central axis of the lower shaft, and a second return air outlet is formed in the side wall of the bottom of the lower shaft;

and a heating insulating layer is arranged on the outer wall of the channel body.

Furthermore, the number of spinning holes of the annular spinneret plate is 3000-5000 holes.

Further, the heating and heat-insulating layer comprises an electric heat tracing layer and a heat-insulating layer, and the heat-insulating layer is arranged on the outer surface of the electric heat tracing layer.

Furthermore, the diameters of the upper shaft and the middle shaft are 500-550 m, and the diameter of the lower shaft is 1000-1100 m.

Furthermore, the height of the upper shaft is 1.5-3 m, the height of the middle shaft is 2-3 m, and the height of the lower shaft is 10-15 m.

Further, the upper channel and the lower channel are both connected with a gas heating device, the upper channel is communicated with the gas heating device through the air inlet pipe, and the lower channel is communicated with the gas heating device through the air inlet.

Furthermore, the first return air outlet and the second return air outlet are both connected with a solvent recovery device.

Compared with the prior art, the utility model provides a beneficial effect that technical scheme brought is:

the utility model provides a big silk bundle polyimide fibre dry spinning corridor, including corridor body, air-supply line, two first orifice plates, two second orifice plates and two annular spinneret, corridor body divide into upper corridor, well corridor and lower corridor from top to bottom, adopt built-in air-supply line in upper corridor, blow to the silk bundle evenly through first orifice plate, the heating heat preservation of upper corridor can adjust corresponding temperature according to the technological requirement simultaneously, realize the quick evaporation of solvent, make the fibre tentatively solidify, the return air passageway makes hot air flow field steady, the air current that blows to the silk bundle is homogeneous stable, can make the solvent in big silk bundle dope trickle evaporate in time, the silk strip solidifies rapidly, thereby the doubling between the silk bundle has been reduced, realize the spinnability and the stability of big silk bundle; the heating and insulating layer of the middle shaft can further raise the temperature and further evaporate the residual solvent; the diameter of the lower channel is increased to be 1-1.5 times of that of the middle channel, so that the concentration of the generated solvent is reduced after the generated solvent enters the lower channel, the solvent of the tows can be evaporated out completely, the lower channel also adopts a heating insulation layer, the process temperature can be freely adjusted, the solvent in the tows can be evaporated out completely, and an air inlet and a second return air outlet which are additionally arranged on the lower channel are used for bringing the solvent generated by the middle channel and the lower channel out of the channel in time so as to realize the solidification of large tow fibers. Adopt the utility model discloses a device carries out the production of the big silk bundle of polyimide fibre, and output can promote 15 times at least.

Drawings

Fig. 1 is a schematic diagram of a structure of a large-tow polyimide fiber dry spinning channel of the present invention.

1. A corridor body; 11. an upper channel; 12. a middle channel; 13. a lower corridor; 131. a filament outlet; 132. an air inlet; 133. a second return air outlet; 2. an air inlet pipe; 21. an opening; 3. a first orifice plate; 4. a second orifice plate; 5. an annular spinneret plate; 6. a spinning channel; 7. an air return channel; 71. a first return air outlet; 8. heating the heat-insulating layer; 81. an electric tracing layer; 82. and (7) an insulating layer.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, the utility model provides a large-tow polyimide fiber dry spinning channel, which comprises a channel body 1, an air inlet pipe 2, two first orifice plates 3, two second orifice plates 4 and two annular spinneret plates 5; the duct body 1 is divided into an upper duct 11, a middle duct 12 and a lower duct 13 from top to bottom, the upper duct 11, the middle duct 12 and the lower duct 13 are sequentially communicated, the top end of the upper duct 11 and the bottom end of the lower duct 13 are both closed, and a yarn outlet 131 is formed in the bottom end of the lower duct 13; one end of the air inlet pipe 2 is inserted in the upper channel 11 and is closed; two side walls of the air inlet pipe 2 are respectively provided with an opening 21, two first pore plates 3 are respectively arranged at the opening 21, two second pore plates 4 are arranged in the upper chimney 11 and are positioned at two sides of the air inlet pipe, the second pore plates positioned at the same side and the first pore plates are arranged at intervals to form a spinning channel 6, and two annular spinneret plates 5 are arranged at the top end of the upper chimney 11 and are positioned at two sides of the air inlet pipe 2 and correspond to the spinning channel 6; the two second pore plates 4 and the inner walls of the two sides of the upper shaft 11 are respectively arranged at intervals to form two air return channels 7, and the side wall of the top of the middle shaft 12 is provided with a first air return outlet 71 communicated with the air return channels 7; the diameter of the lower shaft 13 is larger than that of the middle shaft 12, a shoulder is formed at the joint of the lower shaft 13 and the middle shaft 12, two air inlets 132 are arranged on the shoulder, the two air inlets 132 are symmetrical about the central axis of the lower shaft 13, and a second return air outlet 133 is arranged on the side wall of the bottom of the lower shaft 13; the outer wall of the channel body 1 is provided with a heating and heat-insulating layer 8.

Compared with the conventional spinning channel for large-tow polyimide fibers, the spinning channel provided by the invention is uniformly blown to the tows through the first pore plate 3, meanwhile, the heating insulation layer of the upper channel 11 can adjust the corresponding temperature according to the process requirements, so that the rapid evaporation of the solvent is realized, the fibers are primarily cured, the hot air flow field is stable through the air return channel 7, the air flow blown to the tows is uniform and stable, the solvent in the stock solution trickle of the large tows can be timely evaporated, the filaments are rapidly cured, the doubling between the tows is reduced, and the spinnability and stability of the large tows are realized; the heating and insulating layer of the middle shaft 12 can further raise the temperature, so that the residual solvent is further evaporated; the diameter of the lower channel 13 is increased to 1-1.5 times of that of the middle channel 12, so that the concentration of the generated solvent is reduced after the generated solvent enters the lower channel, the solvent of the tows is evaporated out conveniently, the lower channel 13 also adopts a heating insulation layer 8, the process temperature can be freely adjusted, the solvent in the tows is evaporated out completely, and an air inlet and a second return air outlet which are additionally arranged on the lower channel are used for timely carrying the solvent generated by the middle channel 12 and the lower channel 13 out of the channel, so that the solidification of large tow fibers is realized.

In some embodiments, the number of spinning holes of the annular spinneret 5 may be 3000 to 5000 holes in order to improve the yield and spinning quality.

In some embodiments, in order to achieve uniform and rapid curing of the filament bundles of the polyimide fiber tows under heat, thereby reducing the doubling between the filament bundles, the heating insulation layer 8 may include an electric heat tracing layer 81 and an insulation layer 82, and the insulation layer 82 is disposed on the outer surface of the electric heat tracing layer 81.

In some embodiments, in order to stabilize the air flow in the spinning channel and reduce the yarn sloshing, the diameter of the upper shaft 11 and the diameter of the middle shaft 12 may be 500-550 m, and the diameter of the lower shaft 11 may be 1000-1100 m.

In some embodiments, in order to improve spinning quality, the spinning shaft is removed by solvent, the height of the upper shaft 11 can be 1.5-3 m, the height of the middle shaft can be 2-3 m, and the height of the lower shaft can be 10-15 m.

In some embodiments, in order to ensure that the air flow in the spinning shaft is heated uniformly to meet the temperature requirement of each process section of the spinning, both the upper shaft 11 and the lower shaft 13 are connected with a gas heating device, the upper shaft 11 is communicated with the gas heating device through the air inlet pipe 2, and the lower shaft 13 is communicated with the gas heating device through the air inlet 132.

In some embodiments, the first return air outlet 71 and the second return air outlet 133 are connected to a solvent recovery device, and the recovered solvent can be treated and reused for economic and environmental protection.

The utility model discloses a big silk bundle polyimide fibre dry spinning corridor is at work, polyimide solution forms the dope trickle from being located the 5 blowout of annular spinneret on 11 tops of upper chimney, the dope trickle passes through upper chimney 11 in proper order, well chimney 12 and lower chimney 13, the dope trickle is at the in-process through chimney body 1, because polyimide's solvent (DMAC) volatilizees gradually under the effect of high temperature air current in chimney body 1, the dope trickle becomes solid-state polyimide fibre by liquid gradually in-process to the well chimney 12 from upper chimney 11, polyimide fibre becomes big polyimide fibre through the bottom outlet 131 back of lower chimney 13.

The utility model discloses a big silk bundle polyimide fibre dry spinning corridor air current trend: the utility model discloses there is an air-supply line 2, two first return air exports 71, two air intakes 132, a second return air export 133, hot-blast entering from air-supply line 2, the micropore of the first orifice plate 3 through the 2 lateral walls of air-supply line gets into in the corridor 11, blow to the silk bundle, second orifice plate 4 on the inner wall of corridor 11 gets into return air passageway 7 on the process, then go out from two first return air exports 71, remaining amount of wind is in the middle of the process corridor 12 gets into down corridor 13, the corridor 13 under hot-blast two air intakes 132 entering of follow simultaneously, take the corridor out through second return air export 133.

The above is not mentioned, is suitable for the prior art.

While certain specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and not limitation, as various modifications or additions may be made to the described specific embodiments or alternatives thereto, as will be apparent to those skilled in the art, without departing from the scope of the invention or exceeding the scope of the claims. It should be understood by those skilled in the art that any modifications, equivalent substitutions, improvements and the like made to the above embodiments according to the technical spirit of the present invention should be included in the scope of the present invention.

Claims (7)

1. A large-tow polyimide fiber dry spinning channel is characterized by comprising a channel body (1), an air inlet pipe (2), two first pore plates (3), two second pore plates (4) and two annular spinneret plates (5);

the channel body (1) is divided into an upper channel (11), a middle channel (12) and a lower channel (13) from top to bottom, the upper channel (11), the middle channel (12) and the lower channel (13) are sequentially communicated, the top end of the upper channel (11) and the bottom end of the lower channel (13) are both closed, and a yarn outlet (131) is formed in the bottom end of the lower channel (13);

one end of the air inlet pipe (2) is inserted into the upper channel (11) and is closed; openings (21) are respectively formed in two side walls of the air inlet pipe (2), two first pore plates (3) are respectively arranged at the positions of the openings (21), two second pore plates (4) are arranged in the upper passage (11) and positioned on two sides of the air inlet pipe, the second pore plates and the first pore plates positioned on the same side are arranged at intervals to form a spinning channel (6), and two annular spinneret plates (5) are arranged at the top end of the upper passage (11), positioned on two sides of the air inlet pipe (2) and corresponding to the spinning channel (6);

the two second pore plates (4) and the inner walls of the two sides of the upper shaft (11) are respectively arranged at intervals to form two air return channels (7), and a first air return outlet (71) communicated with the air return channels (7) is arranged on the side wall of the top of the middle shaft (12);

the diameter of the lower duct (13) is larger than that of the middle duct (12), a shoulder is formed at the joint of the lower duct (13) and the middle duct (12), two air inlets (132) are formed in the shoulder, the two air inlets (132) are symmetrical with respect to the central axis of the lower duct (13), and a second return air outlet (133) is formed in the side wall of the bottom of the lower duct (13);

and a heating insulation layer (8) is arranged on the outer wall of the channel body (1).

2. The large-tow polyimide fiber dry spinning shaft according to claim 1, wherein the number of spinning holes of the annular spinneret plate (5) is 3000-5000 holes.

3. The duct for dry-spinning large-tow polyimide fibers according to claim 2, wherein the heating insulation layer (8) comprises an electric heat-tracing layer (81) and an insulation layer (82), and the insulation layer (82) is arranged on the outer surface of the electric heat-tracing layer (81).

4. The dry spinning shaft for large-tow polyimide fibers as claimed in claim 2, characterized in that the diameters of the upper shaft (11) and the middle shaft (12) are 500-550 m, and the diameter of the lower shaft (13) is 1000-1100 m.

5. The dry spinning shaft for large-tow polyimide fibers as claimed in claim 2, wherein the height of the upper shaft (11) is 1.5-3 m, the height of the middle shaft (12) is 2-3 m, and the height of the lower shaft (13) is 10-15 m.

6. The dry spinning shaft for large-tow polyimide fibers according to claim 3, characterized in that the upper shaft (11) and the lower shaft (13) are connected with a gas heating device, the upper shaft (11) is communicated with the gas heating device through the air inlet pipe (2), and the lower shaft (13) is communicated with the gas heating device through the air inlet (132).

7. The large-tow polyimide fiber dry spinning shaft according to claim 3, wherein the first return air outlet (71) and the second return air outlet (133) are both connected with a solvent recovery device.

Images