CN116770447A - Silk-liquid separation device, washing equipment and washing method for cellulose fiber spinning - Google Patents

Abstract

The invention discloses a silk-liquid separation device, washing equipment and a washing method for cellulose fiber spinning, wherein the silk-liquid separation device comprises a central channel for fiber tows to pass through, an air inlet cavity and an air outlet cavity, the air inlet cavity and the air outlet cavity are oppositely arranged at two sides of the central channel, and a plurality of through holes are respectively arranged on the walls between the air inlet cavity and the central channel and between the air outlet cavity and the central channel; when the fiber tows pass through the central channel, gas enters the central channel from the gas inlet cavity, sweeps the fiber tows, and then is discharged through the gas outlet cavity. The washing equipment comprises a plurality of washing areas which are arranged in series, wherein each washing area is provided with a fiber bearing part, a dense curtain type spraying device is arranged above the bearing part, and liquid is sprayed to the fibers for washing; at least a silk-liquid separation device is arranged between the adjacent washing areas. The washing equipment provided by the invention can improve the washing effect and the washing efficiency, can reduce fiber abrasion, and realizes high-speed and high-efficiency washing under high-speed spinning.

Description

Silk-liquid separation device, washing equipment and washing method for cellulose fiber spinning

Technical Field

The invention belongs to the technical field of cellulose fibers, and particularly relates to a silk-liquid separation device, washing equipment and a washing method for cellulose fiber spinning.

Background

The Lyocell filament is a cellulose filament prepared by dissolving cellulose in NMMO aqueous solution to form spinning solution, rapidly forming by a dry-spray wet method and then carrying out high-efficiency post-treatment, the production process is environment-friendly, NMMO is recycled, and the novel green cellulose high-grade filament variety is provided. The high-strength cotton fiber has the advantages of excellent hygroscopicity, gloss, comfortableness, drapability and antistatic effect of traditional cellulose filaments such as viscose filaments and cuprammonium filaments, and higher mechanical property, and also has higher mechanical strength in a wet state, so that the prepared textile has excellent performance and good strength and dimensional stability, and can be applied to the fields of medium-high-strength industrial cord threads and the like which cannot be achieved by the traditional cellulose filaments.

For Lyocell filaments prepared at high spinning speed, in order to achieve high recovery rate of NMMO solvent used, residual solvent in fibers is reduced, fiber quality is improved, and long-process water washing is generally adopted to achieve sufficient water washing, but the investment and operation cost are greatly increased in the long-process water washing process, so that the production cost of the Lyocell filaments is difficult to reduce, the water washing process is a wet mechanical abrasion process of the fibers, and the longer the process is, the more fibrillated the fibers are, and the fiber quality is reduced. Due to the abrasion problem, the conventional washing equipment cannot meet the requirement of high-efficiency washing of Lyocell filaments at a spinning speed of 200-800 m/min. How to effectively reduce the abrasion between filaments and equipment while improving the water washing efficiency is very critical, and is a problem to be solved at present.

The present invention has been made in view of this.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a silk-liquid separation device, washing equipment and a washing method for cellulose fiber spinning. The silk-liquid separation device is non-contact, the silk bundle does not contact with equipment, the silk bundle and water washing liquid separation effect is improved, and meanwhile, the abrasion of the silk bundle in the high-speed water washing process can be effectively reduced. The intensive curtain cloth type spraying device is adopted in the washing equipment, and the silk-liquid separation device is arranged in a matched mode, so that the washing effect can be improved, abrasion can be greatly reduced, and high-speed washing under high-speed spinning is realized.

In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that:

the first object of the invention is to provide a fiber-liquid separation device for cellulose fiber spinning, which comprises a central channel for fiber tows to pass through, an air inlet cavity and an air outlet cavity, wherein the air inlet cavity and the air outlet cavity are oppositely arranged at two sides of the central channel, and a plurality of through holes are respectively arranged on the walls between the air inlet cavity and the central channel and between the air outlet cavity and the central channel; when the fiber tows pass through the central channel, gas enters the central channel from the gas inlet cavity, sweeps the fiber tows, and then is discharged through the gas outlet cavity.

The silk-liquid separation device provided by the invention has the advantages that the silk bundle passes through the central channel without any contact with equipment, the abrasion of the silk bundle in the high-speed water washing process can be effectively reduced while the silk bundle and the water washing liquid separation effect is improved, the fibrillation of the silk in the post-treatment process is reduced as much as possible, and the high-efficiency water washing of the cellulose silk at the spinning speed of 80-1000m/min can be realized.

According to a further scheme, the advancing direction of the fiber tows is taken as a reference, the air inlet cavity is positioned at the upper side of the central channel, and the air outlet cavity is positioned at the lower side of the central channel; alternatively, the air inlet cavity is positioned at the lower side of the central channel, and the air outlet cavity is positioned at the upper side of the central channel;

preferably, the air inlet cavity is positioned at the upper side of the central channel, the air outlet cavity is positioned at the lower side of the central channel, and the included angle alpha between the inlet direction of the air in the air inlet cavity entering the central channel and the advancing direction of the fiber bundles ₁ An included angle alpha between the gas discharge direction in the exhaust chamber and the advancing direction of the filament bundle is not more than 45 DEG ₂ No greater than 30 deg..

According to the invention, by controlling the angle relation between the directions of air inlet and air outlet and the advancing direction of the tows, adverse effects on the tows caused by excessive wind resistance can be avoided, the tows can be well purged, the liquid in the tows is separated as soon as possible, and the efficiency of subsequent water washing is improved.

Preferably, a porous air homogenizing plate is arranged at a position, close to the central channel, in the air inlet cavity so as to improve the uniformity of hot air flow.

Preferably, the inlet and outlet of the central passage are provided with wear resistant guides, respectively, to prevent strand wear.

The further scheme comprises a gas circulation pipeline which is respectively communicated with the air inlet of the air inlet cavity and the air outlet of the air outlet cavity, so that the gas circulates and sweeps the fiber in the central channel;

preferably, the gas circulation pipeline is provided with a heat exchange device, and the gas is heated after passing through the heat exchange device.

In a further scheme, in the filament liquid separation device, the speed of hot air entering the central channel from the air inlet cavity is not lower than 5m/s, and the temperature is 60-90 ℃.

The second object of the invention is to provide a high-speed cellulose fiber washing device, which comprises a plurality of washing areas which are arranged in series, wherein a fiber bearing part is arranged in each washing area, a dense curtain cloth type spraying device is arranged above the bearing part, and liquid is sprayed to the fibers for washing; at least a silk-liquid separation device is arranged between the adjacent washing areas;

preferably, a wire-liquid separation device as described above is provided between each adjacent support member.

In the high-speed cellulose fiber washing equipment, in order to be suitable for high-speed spinning, spraying type water washing liquid is adopted, and a contactless silk liquid separation device is matched, so that abrasion to silk bundles can be reduced, high-speed spinning washing is realized, washing efficiency is improved, and fiber quality is ensured.

Further, the supporting component is a driving roller, a plurality of parallel grooves are distributed on the driving roller, advancing fibers are positioned in the parallel grooves, and the intensive curtain cloth spraying device sprays water washing liquid to submerge tows in the parallel grooves.

The intensive curtain cloth type spraying device can ensure the uniformity and stability of the washing liquid on the driving roller, so that the washing effect of each fiber or each filament is consistent and sufficient. The multi-beam silk bundles can pass through the driving roller in parallel and pass through the inside of the parallel groove, so that the water washing liquid submerges the multi-beam silk bundles, the multi-beam silk bundles can be washed in parallel and simultaneously, the production efficiency is improved, the impact and abrasion of the water washing liquid on the silk bundles can be reduced, and the fiber quality is improved.

Further, the water outlet of the intensive curtain type spraying device comprises a slit or a plurality of small holes, sprayed water washing liquid forms a intensive curtain, and the covered width e of the curtain is larger than the total width f of tows on the driving roller;

preferably, the spacing d between adjacent apertures is no greater than 5mm;

preferably, a plurality of dense curtain-type spraying devices are arranged on each driving roller along the advancing direction of the filament bundles.

Further, the spraying direction of the intensive curtain type spraying device is adjustable, the spraying direction is arranged at an angle with the vertical plane where the central shaft of the driving roller is located, or the spraying direction is vertical to the horizontal plane where the central shaft of the driving roller is located;

preferably, the spraying direction of the intensive curtain type spraying device is perpendicular to the horizontal plane where the central shaft of the driving roller is located.

A third object of the present invention is to provide a method of washing with water using the cellulose fiber high-speed washing apparatus as described above, comprising: the fiber tows enter a washing area under the guidance of the bearing component, the dense curtain type spraying device sprays water washing liquid to form a dense water curtain to exchange and wash the fibers, then the fiber tows pass through the silk liquid separating device, liquid is separated from the fiber tows, the fiber tows enter the next washing area, and the process is repeated.

In a further scheme, the temperature of the washing liquid in each washing area is 20-80 ℃; preferably 30-80 ℃.

Experiments show that when the cellulose fiber passes through the water washing equipment, the cellulose fiber is sprayed and immersed on the driving roller through high-temperature water washing liquid, so that the stability of spinning can be ensured, and the water washing liquid after heating accelerates the exchange speed of the solvent in the fiber, thereby increasing the water washing effect.

Preferably, the temperature of the washing liquid in each washing zone is gradually increased in the traveling direction of the fiber strands;

preferably, the concentration of the water wash liquid in each water wash zone gradually decreases in the traveling direction of the fiber tows.

The invention adopts the water washing liquid with increased temperature to spray and wash, and adopts the gradient water washing liquid with gradually reduced partition concentration and gradually increased temperature, thereby being capable of accelerating the exchange speed of the fiber and the water washing liquid and being beneficial to further improving the water washing efficiency. Each washing area is provided with a shielding door, so that a closed space is formed in the washing area, low-concentration washing liquid returns to the high-concentration washing area, recycling is realized, loss of washing liquid and heat is reduced, and cost is reduced.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects:

1. the silk-liquid separation device of the cellulose fiber is a non-contact type, the silk-liquid separation device is filled with high-speed hot air flow, and tows pass through a central channel without any contact with the device, so that the abrasion of the tows in the high-speed water washing process can be effectively reduced while the separation effect of the tows and the water washing liquid is improved, the fibrillation of the filaments in the post-treatment process is reduced as much as possible, and the high-efficiency water washing of the cellulose filaments at the spinning speed of 80-1000m/min can be realized.

2. Lyocell fiber washing is realized by performing diffusion exchange between washing liquid and NMMO solvent in the fiber and on the surface of the fiber, and frequent absorption and release of the washing liquid by the fiber can be beneficial to improving washing efficiency. According to the cellulose fiber washing equipment, the dense curtain cloth type spraying device is used for spraying the fiber tows with the washing liquid, so that the tows are fully contacted with the washing liquid effectively, the contact sufficiency and uniformity of different tows and the silk liquid are improved, and the non-contact silk liquid separation device is arranged in a matched mode, so that the preamble washing liquid is removed, the follow-up efficient absorption of the washing liquid is facilitated, and the washing efficiency is improved. Thus, the high-efficiency full water washing under high-speed spinning can be realized, the abrasion of the fibers can be reduced, and the fiber quality can be improved.

3. The invention adopts the water washing liquid with increased temperature to spray and wash, and adopts the gradient water washing liquid with gradually reduced partition concentration and gradually increased temperature, thereby being capable of accelerating the exchange speed of the fiber and the water washing liquid and being beneficial to further improving the water washing efficiency. Each washing area is provided with a shielding door, so that a closed space is formed in the washing area, low-concentration washing liquid returns to the high-concentration washing area, recycling is realized, loss of washing liquid and heat is reduced, and cost is reduced.

4. The invention not only improves the high-speed washing efficiency of cellulose fibers and reduces the damage to the fibers in the tow washing process, but also reduces the loss of NMMO solvent in the washing liquid, can be used for high-speed washing of cellulose filaments at the spinning speed of 200-800m/min, and can wash the NMMO solvent content in the fibers to below 0.01%. The method effectively reduces investment and production cost, improves stability and production efficiency in the production process, improves product quality, and is more suitable for industrialized popularization.

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:

FIG. 1 is a schematic diagram of a non-contact type wire-liquid separation device according to the present invention;

FIG. 2 is a schematic diagram of a high-speed water washing process for cellulose fibers provided by the invention;

FIG. 3 is a schematic structural view of a high-speed washing apparatus for cellulose fibers according to the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic diagram of a specific structure of the dense curtain spray device provided by the invention;

FIG. 6 is a schematic view of the dense curtain spray apparatus of FIG. 5 spraying;

FIG. 7 is a schematic view of another specific structure of the dense curtain spray device provided by the invention;

FIG. 8 is a schematic view of the dense curtain spray apparatus of FIG. 7 spraying;

wherein, 1-center channel, 2-air inlet chamber, 21-air inlet, 3-exhaust chamber, 31-exhaust port, 4-porous air homogenizing plate, 5-gas circulation pipeline, 6-bearing part, 61-driving roller, 7-intensive curtain cloth spray device, 71-water inlet, 72-water outlet, 8-silk liquid separation device.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1, the present embodiment provides a filament liquid separation device 8 for cellulose fiber spinning, which includes a central channel 1 for fiber tows to pass through, an air inlet cavity 2 and an air outlet cavity 3, wherein the air inlet cavity 2 and the air outlet cavity 3 are oppositely arranged at two sides of the central channel 1, and a plurality of through holes are respectively arranged on walls between the air inlet cavity 2 and the air outlet cavity 3 and the central channel 1; as the fiber tow passes through the central passage 1, gas enters the central passage 1 from the gas inlet chamber 2, sweeps the fiber tow, and is then exhausted through the exhaust chamber 3.

The silk-liquid separator 8 is a non-contact silk-liquid separator, the silk-liquid separator is introduced with high-speed hot air flow which forms a certain angle with the advancing direction of silk bundles, the silk bundles pass through the central channel 1 and do not have any contact with the device, the abrasion of the silk bundles in the high-speed water washing process can be effectively reduced while the separation effect of the silk bundles and the water washing liquid is improved, the fibrillation of the silk bundles in the post-treatment process is reduced as much as possible, and the high-efficiency water washing of cellulose silk at the spinning speed of 80-1000m/min can be realized.

In order to improve the efficiency of blowing the fiber tows by gas to separate the silk from the liquid, hot air can be introduced. That is, the air intake chamber 2 is a hot air inlet region, the central passage 1 is a tow passage region, and the air discharge chamber 3 is a gas discharge region. The hot air is introduced into the hot air inlet area, and the temperature and the speed are adjustable, so that the efficiency of silk-liquid separation is better improved.

Further, based on the advancing direction of the fiber tows, the air inlet cavity 2 is located at the upper side of the central channel 1, the air outlet cavity 3 is located at the lower side of the central channel 1, and the air inlet flow is in the same direction as the advancing direction of the fiber tows in the horizontal direction, and the included angle (acute angle) alpha between the introducing direction of the air in the air inlet cavity into the central channel and the advancing direction of the fiber tows ₁ No greater than 45 °;

alternatively, the air inlet cavity 2 is positioned at the lower side of the central channel 1, and the air outlet cavity 3 is positioned at the upper side of the central channel 1; at this time, the inlet air flow is opposite to the advancing direction of the fiber tows in the horizontal direction, and an included angle (obtuse angle) formed between the inlet direction of the air in the inlet cavity entering the central channel and the advancing direction of the fiber tows is not less than 150 degrees.

Preferably, the air inlet cavity 2 is located at the upper side of the central channel 1, the air outlet cavity 3 is located at the lower side of the central channel 1, and the included angle alpha between the inlet direction of the air in the air inlet cavity 2 entering the central channel 1 and the advancing direction of the fiber bundles ₁ An included angle alpha between the gas discharge direction in the exhaust chamber 3 and the advancing direction of the filament bundle is not more than 45 DEG ₂ No greater than 30 deg.. The sweeping effect of this scheme to the fibre silk bundle is better.

According to the invention, by controlling the angle relation between the directions of air inlet and air outlet and the advancing direction of the tows, adverse effects on the tows caused by excessive wind resistance can be avoided, the tows can be well purged, the liquid in the tows is separated as soon as possible, and the efficiency of subsequent water washing is improved.

A porous air homogenizing plate 4 is arranged in the air inlet cavity 2 near the central channel 1 so as to improve the uniformity of hot air flow.

The air inlet cavity 2 is a semi-closed area, and the joint of the air inlet cavity 2 and the central channel 1 is provided with a porous air homogenizing plate 4, so that the air flow of the central channel 1 by the air inlet cavity 2 is more uniform and stable, the blowing effect of the air on each section of the fiber tows is more uniform, and the uniformity is ensured.

In the invention, the air inlet cavity 2 and the air outlet cavity 3 are positioned at two opposite sides of the central channel 1, and air can be directly discharged after entering the central channel 1 to sweep fiber tows, so that dead angles are avoided, and turbulent air flow is avoided.

In the invention, the inlet and the outlet of the central channel 1 are also respectively provided with an anti-abrasion wire guide to prevent the abrasion of the wire bundles.

In the invention, the silk-liquid separation device 8 further comprises a gas circulation pipeline 5, a hot gas source is arranged on the gas circulation pipeline 5, and the gas circulation pipeline 5 is respectively communicated with the gas inlet 21 of the gas inlet cavity 2 and the gas outlet 31 of the gas outlet cavity 3, so that the gas circulates and sweeps the fiber in the central channel 1.

As a preferred solution, the gas circulation line 5 is further provided with a heat exchange device for heating the hot gas source or the gas in the gas circulation line 5.

The hot air is pumped out from the exhaust port 31 of the exhaust cavity 3 and returns to the gas circulation pipeline 5 and the hot air source, and is heated by the heat exchange device and then enters the air inlet cavity 2, so that the hot air forms dynamic circulation in the wire-liquid separator. The speed of the hot air is not lower than 5m/s, and the temperature is 60-90 ℃.

The non-contact type silk-liquid separation device 8 provided by the embodiment has wide application scene, can realize high-efficiency water washing of cellulose filaments at the spinning speed of 80-1000m/min, is particularly suitable for high-speed water washing of cellulose filaments at the spinning speed of 200-800m/min, and can effectively avoid abrasion of fibers.

Example two

Referring to fig. 2-5, the present embodiment provides a high-speed cellulose fiber washing apparatus, which includes a plurality of serially arranged washing areas, each washing area is provided with a fiber supporting member 6, a dense curtain-type spray device 7 is arranged above the supporting member 6, and sprays liquid to the fibers for washing; at least between adjacent washing zones, a wire-liquid separation device 8 as described in embodiment one is provided.

In the high-speed cellulose fiber washing equipment of the embodiment, in order to be suitable for high-speed spinning, spraying type water washing liquid is adopted, and the contactless silk liquid separation device 8 in the first embodiment is matched, so that abrasion to tows can be reduced, high-speed spinning washing is realized, washing efficiency is improved, and fiber quality is guaranteed.

In the high-speed washing machine for cellulose fibers of the present embodiment, the filament liquid separation device 8 may be provided at any position where filament liquid separation is required. In order to ensure the water washing effect, at least between adjacent water washing areas. The filament liquid separator can separate the liquid inside the filament bundle which is discharged from the washing zone (to be fed into the next washing zone) from the filament bundle, so that the filament bundle can efficiently absorb the washing liquid after being fed into the next washing zone, and the washing efficiency is further increased.

As a preferred mode, the silk-liquid separation device 8 is arranged between every two adjacent supporting parts 6, so that after the fiber tows are washed by the washing liquid sprayed by the intensive curtain cloth spraying device 7 each time, silk-liquid separation is carried out, and the next absorption of the sprayed washing liquid is facilitated, thereby improving the washing efficiency.

The aqueous washing liquid in the invention can be water washing liquid existing in the prior art, and specifically, NMMO aqueous solution is adopted in the invention.

For high-speed spinning, the supporting member 6 is a driving roller 61, a plurality of parallel grooves are distributed on the driving roller 61, travelling fibers are positioned in the parallel grooves, and the dense curtain type spraying device 7 sprays water washing liquid to submerge tows in the parallel grooves.

The dense curtain spray 7 ensures uniformity and stability of the washing liquid on the drive roller 61 so that the washing effect per fiber or filament bundle is uniform and sufficient. The multiple bundles of filament bundles can pass through the driving roller 61 in parallel and pass through the inside of the parallel grooves, so that the water washing liquid submerges the multiple bundles of filament bundles, the parallel and simultaneous water washing of the multiple bundles of filament bundles can be realized, the production efficiency is improved, the impact and abrasion of the water washing liquid on the filament bundles can be reduced, and the fiber quality is improved.

In this embodiment, the water washing liquid sprayed by the dense curtain type spraying device 7 forms a water curtain, can be uniformly dispersed in the range of the tow area, basically covers the supporting member 6, and can be provided with a plurality of dense curtain type spraying devices 7 on one supporting member 6. The spray type water washing liquid is adopted under high-speed spinning, so that abrasion and impact of the water washing liquid on the filament bundles can be reduced.

The intensive curtain cloth spraying device 7 is provided with a water inlet 71 and a water outlet 72, the water outlet 72 comprises a slit or a plurality of small holes, sprayed water washing liquid forms a intensive water curtain, and the width e covered by the water curtain is larger than the total width f of tows on the driving roller 61.

Preferably, the spacing d between adjacent apertures is no greater than 5mm.

Specifically, the dense curtain spray can be implemented in various ways:

in the scheme 1, as shown in fig. 5, a slit type spray header P1 is adopted, water washing water enters the spray header from an upper side inlet, and a uniform and dense fan-shaped water curtain is formed through a long slit below a spray head under the action of pressure (as shown in fig. 6);

in the scheme 2, as shown in fig. 7, in the pipe-type spray pipe structure P2, the distance d between water outlet points of the spray pipe is preferably smaller than 5mm, the water outlet points are round holes or slits, and a plurality of water outlet points jointly form a dense rectangular water curtain (as shown in fig. 8).

It should be noted that the above is an example, and the implementation manner of forming the dense water curtain is not limited to the above manner.

Further, a plurality of dense curtain-type spraying devices 7 are arranged on each driving roller 61 along the advancing direction of the filament bundles so as to increase the washing effect.

Further, the spraying direction of the intensive curtain type spraying device 7 is adjustable, as shown in fig. 5 and 7, the spraying direction is set at an angle with the vertical plane where the central axis of the driving roller 61 is located, or the spraying direction is perpendicular to the horizontal plane where the central axis of the driving roller 61 is located.

Preferably, the intensive curtain cloth spraying device 7 is located right above the central shaft of the driving roller 61 and sprays downwards, and the spraying direction is perpendicular to the central shaft of the driving roller 61, so that a good water washing effect is achieved.

In this embodiment, each washing area is provided with a shielding door to close the washing area. Because the invention adopts high-temperature water washing liquid to wash the tows, each washing area is provided with the shielding door, a closed space can be formed in the washing area, and the water washing liquid with a certain temperature transfers heat in the closed space, so that the environmental temperature of the washing area rises, thereby being beneficial to increasing the exchange effect of the water washing liquid and the tows; meanwhile, the shielding door prevents the water washing liquid from splashing, and reduces the loss of the water washing liquid, thereby reducing the loss of NMMO in the production process.

In the implementation, a plurality of intensive cord fabric type washing solutions can adopt one washing solution concentration, the subsequent washing solution concentration is gradually reduced, and then the low-concentration washing solution returns to the high-concentration washing solution so as to meet the system balance. The temperature of the aqueous wash solution may be at ambient temperature, preferably at 30-80℃for increasing the exchange rate, preferably with a gradual increase in the subsequent aqueous wash solution temperature.

In addition, the present embodiment also provides a method for washing with the high-speed washing apparatus for cellulose fibers as described above, comprising: the fiber tows enter a washing area under the guidance of the bearing part 6, the dense curtain type spraying device 7 sprays water washing liquid to form a dense water curtain to exchange and wash the fibers, then the fiber tows pass through the silk-liquid separating device 8, liquid is separated from the fiber tows, the fiber tows enter the next washing area, and then the process is repeated.

In the method, in the filament liquid separation device 8, the speed of the hot air entering the central channel 1 from the air inlet cavity 2 is not lower than 5m/s, and the temperature is 60-90 ℃.

In the method, the temperature of the washing liquid in each washing area is 20-80 ℃; the temperature is preferably 30-80 ℃.

Experiments show that when the cellulose fiber passes through the water washing equipment, the high-temperature water washing liquid is sprayed and immersed on the driving roller 61, so that the stability of spinning can be ensured, and the water washing liquid after heating accelerates the exchange speed of the solvent in the fiber, thereby increasing the water washing effect.

As a preferred embodiment, the temperature of the water wash liquid in each water wash zone is gradually increased in the traveling direction of the fiber tow. The concentration of the water wash in each water wash zone gradually decreases in the direction of travel of the fiber tows. In this way, the washing liquid having a gradually increased temperature and a gradually decreased concentration can improve the washing effect.

Specifically, when the cellulose filaments pass through the washing equipment, the intensive curtain cloth spraying device 7 sprays high-temperature water washing liquid to wash and submerge the fiber tows on the driving roller 61, and the exchange efficiency of the water washing liquid and the solvent in the fibers is increased by a certain temperature, so that the washing effect is improved; a filament-liquid separator is arranged between the water washing areas or between the driving rollers 61, and can separate the liquid inside the filament bundle which has exited the spraying area (to enter the next spraying area) from the filament bundle, so that the filament bundle can efficiently absorb the water washing liquid after entering the next spraying area, and the water washing efficiency is further increased. The filament liquid separator is introduced with high-speed hot air which is arranged at an angle with the advancing direction of the filament bundle, the filament bundle is not in any contact with equipment, the abrasion of the filament bundle in the high-speed water washing process can be avoided while the separation effect of the filament bundle and the water washing liquid is improved, the fibrillation of the filament in the post-treatment process is reduced as much as possible, and the high-efficiency water washing of the cellulose filament at the spinning speed of 200-800m/min can be realized.

Test example 1

With the washing apparatus of example two, as shown in fig. 3, filaments having a fineness of 200dtex were washed with water using a multi-roll shower washing apparatus at a higher spinning speed. The pipe type spray pipe structure is adopted, the water outlet point spacing is 3mm, so that spray water forms a rectangular planar water curtain. The water washing equipment is divided into 4 areas, the water washing liquid of the 4 areas is NMMO water solution, the concentration is 20%, 12%, 4% and 0% in sequence from front to back according to the advancing direction of the filament bundle, the water washing liquid with different temperatures is respectively used, different numbers of filament liquid separators are configured, other conditions are the same, and the specific evaluation and the fiber performance after water washing are shown in Table 1.

Table 1 evaluation of the degree of washing with water

Analysis of results:

1. as shown in the results in Table 1, the wire liquid separators are not arranged in the groups 1 and 2, the mass fraction of NMMO in the fiber is obviously higher than that of the groups 3 to 7 provided with the wire liquid separators, which indicates that the wire liquid separators can improve the water washing effect, greatly reduce the content of NMMO in the fiber, and the quality of the obtained fiber is qualified. Specifically, the silk-liquid separator can be arranged between the washing areas with different concentrations, but the washing effect of arranging the silk-liquid separator between each supporting part is better.

2. The water washing temperatures of the four areas can be respectively set to 20 ℃, 40 ℃, 50 ℃ and 60 ℃, and the water washing effect is better than that of normal-temperature water washing. The number of water washing zones can be increased, and the higher the spinning speed, the more water washing zones can be considered according to the spinning speed. A contact type filament liquid separator is selected when the spinning speed is lower than 200m/min, but a non-contact type filament liquid separator is adopted when the spinning speed is higher than 200m/min in order to reduce abrasion to the filament bundle. The speed, temperature and blowing direction of hot air of the non-contact type wire-liquid separator can be adjusted according to actual outline.

Test example two

In this test example, the test group used the water washing apparatus of example two, and the spinning speed was adjusted according to table 2 with reference to the method of group 3 in test example one. The control group was different from the test group in that the non-contact type separating device was replaced with a contact type separating device, specifically with a press roller, and the spinning speed was adjusted as shown in table 2. The degree of fibrillation of the fibers is characterized by the wet rub time, the shorter the wet rub time, the higher the degree of fibrillation of the fibers. The results of the fiber washing are shown in Table 2.

TABLE 2 degree of fibrillation of fibers

As shown in the results of Table 2, when the spinning speed was 100m/min, the wet friction time of the test group was slightly longer, which was basically equivalent to that of the control group, indicating that the fibrillation degree of the two groups was not very different; when the spinning speed is 200m/min, the wet friction time of the test group is longer than that of the control group, which indicates that the fibrillation degree of the test group is lower than that of the control group; when the spinning speed reaches 400m/min, the wet friction time of the test group is far longer than that of the control group and is twice that of the control group, which indicates that the fibrillation degree of the test group is far lower than that of the control group. The non-contact type fiber-liquid separator can greatly reduce the fibrillation degree of the fiber during high-speed spinning and ensure the quality of the fiber washed by high-speed spinning water.

The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any and all simple modifications, equivalent variations and adaptations of the embodiments described above, which are within the scope of the invention, may be made by those skilled in the art without departing from the scope of the invention.

Claims (10)

1. The silk-liquid separation device for cellulose fiber spinning is characterized by comprising a central channel for fiber tows to pass through, an air inlet cavity and an air outlet cavity, wherein the air inlet cavity and the air outlet cavity are oppositely arranged at two sides of the central channel, and a plurality of through holes are respectively arranged on the walls between the air inlet cavity and the central channel and between the air outlet cavity and the central channel; when the fiber tows pass through the central channel, gas enters the central channel from the gas inlet cavity, sweeps the fiber tows, and then is discharged through the gas outlet cavity.

2. The filament liquid separator according to claim 1 wherein the air intake chamber is located on the upper side of the central passage and the air exhaust chamber is located on the lower side of the central passage with respect to the traveling direction of the fiber strands; alternatively, the air inlet cavity is positioned at the lower side of the central channel, and the air outlet cavity is positioned at the upper side of the central channel;

preferably, the air inlet cavity is positioned at the upper side of the central channel, the air outlet cavity is positioned at the lower side of the central channel, and the included angle alpha between the inlet direction of the air in the air inlet cavity entering the central channel and the advancing direction of the fiber bundles ₁ An included angle alpha between the gas discharge direction in the exhaust chamber and the advancing direction of the filament bundle is not more than 45 DEG ₂ No greater than 30 °;

preferably, a porous air homogenizing plate is arranged at a position, close to the central channel, in the air inlet cavity;

preferably, the inlet and outlet of the central passage are provided with wear resistant wire guides, respectively.

3. The wire-liquid separation apparatus according to claim 1 or 2, further comprising a gas circulation line which communicates with the gas inlet of the gas inlet chamber and the gas outlet of the gas outlet chamber, respectively, so that the gas circulates to purge the fibers in the central passage;

preferably, the gas circulation pipeline is provided with a heat exchange device, and the gas is heated after passing through the heat exchange device.

4. The high-speed cellulose fiber washing equipment comprises a plurality of washing areas which are arranged in series, wherein a fiber bearing member is arranged in each washing area; a filament liquid separation device according to any one of claims 1-3 provided at least between adjacent washing zones;

preferably, a wire-liquid separation device according to any one of claims 1-3 is arranged between each adjacent support member.

5. The high-speed cellulosic fiber washing apparatus of claim 4 wherein the support member is a drive roll having a plurality of parallel grooves disposed thereon, the traveling fibers being positioned in the parallel grooves, and the dense curtain spray device spraying the water wash to submerge the tows in the parallel grooves.

6. The high-speed cellulose fiber washing device according to claim 5, wherein the water outlet of the intensive curtain type spraying device comprises slits or a plurality of small holes, the sprayed washing liquid forms a intensive water curtain, and the width e covered by the water curtain is larger than the total width f of tows on the driving roller;

preferably, the spacing d between adjacent apertures is no greater than 5mm;

preferably, a plurality of dense curtain-type spraying devices are arranged on each driving roller along the advancing direction of the filament bundles.

7. The high-speed cellulose fiber washing device according to claim 5, wherein the spraying direction of the intensive curtain type spraying device is adjustable, and the spraying direction is arranged at an angle with a vertical plane where a central shaft of the driving roller is located, or is perpendicular to a horizontal plane where the central shaft of the driving roller is located;

preferably, the spraying direction of the intensive curtain type spraying device is perpendicular to the horizontal plane where the central shaft of the driving roller is located.

8. A method of washing with a high-speed washing machine for cellulosic fibres according to any one of claims 4 to 7, characterised in that the fibre tows are led by a support member into a washing zone, that the intensive curtain-type shower device sprays washing liquid to form an intensive curtain for the exchange washing of fibres, that the fibre tows are then passed through a fibre-liquid separation device, that the liquid is separated from the fibre tows, that the fibre tows are led into a subsequent washing zone, and that the aforesaid process is repeated.

9. The method of claim 8, wherein the temperature of the aqueous wash solution in each aqueous wash zone is 20-80 ℃; preferably 30-80 ℃;

preferably, the temperature of the washing liquid in each washing zone is gradually increased in the traveling direction of the fiber strands;

preferably, the concentration of the water wash liquid in each water wash zone gradually decreases in the traveling direction of the fiber tows.

10. The method according to claim 8, wherein the speed of the hot air entering the central passage from the air inlet chamber is not less than 5m/s and the temperature is 60-90 ℃.