A kind of cellulose fiber spinning silk solution separation device, washing equipment and washing method

Abstract

The application discloses a kind of cellulose fiber spinning silk solution separation device, washing equipment and washing method, silk solution separation device includes the central passage that fiber tow passes through, air inlet cavity and exhaust cavity, the air inlet cavity and exhaust cavity are oppositely arranged in the two sides of central passage, multiple through-holes are respectively arranged on the wall between the air inlet cavity and exhaust cavity and central passage;When fiber tow passes through central passage, gas enters central passage from air inlet cavity, sweeps fiber tow, then is discharged through exhaust cavity.Washing equipment includes multiple series connection setting washing zone, and the supporting component of fiber is provided in each washing zone, and dense curtain type spraying device is provided above supporting component, and liquid is sprayed to fiber to carry out washing;At least silk solution separation device is provided between adjacent washing zone.The washing equipment of the application can improve washing effect and washing efficiency, and also can reduce fiber abrasion, realize high-speed high-efficiency washing under high-speed spinning.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cellulose fibers, and particularly relates to a spinning solution separation device for cellulose fiber spinning, a washing equipment and a washing method. BACKGROUND

[0002] Lyocell filament is a cellulose filament prepared by dissolving cellulose in NMMO aqueous solution to form a spinning solution, rapidly forming by dry spraying wet method, and then being treated by high-efficiency post-treatment process. The production process is environmentally friendly, and NMMO is recycled. Lyocell filament is a new type of green cellulose high-grade filament variety. The Lyocell filament has excellent moisture absorption, gloss, comfort, drape and antistatic effect of traditional cellulose filaments such as viscose filament and cuprammonium filament, and has higher mechanical properties. The Lyocell filament still has high mechanical strength in a wet state, so that the textile products prepared by the Lyocell filament have excellent performance, good strength and dimensional stability, and can also be applied to the fields of medium-high strength industrial cord and the like that traditional cellulose filaments cannot reach.

[0003] For the Lyocell filament prepared at a high spinning speed, in order to realize high recovery rate of the used NMMO solvent, reduce the residual solvent in the fiber, and improve the fiber quality, a long process is generally used to realize sufficient washing. However, the washing process of the long process greatly increases the investment and operation cost, thereby leading to difficulty in reducing the production cost of the Lyocell filament. Moreover, the washing process is a process of mechanical wear of the fiber in a wet state, and the longer the process is, the more the fiber fibrillates, and the lower the fiber quality is. Due to the problem of wear, the traditional washing equipment cannot meet the high-efficiency washing of the Lyocell filament at a spinning speed of 200-800 m / min. How to effectively reduce the wear between the filament and the equipment while improving the washing efficiency is a problem to be solved at present.

[0004] Therefore, the present application is provided. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and to provide a spinning solution separation device for cellulose fiber spinning, a washing equipment and a washing method. The spinning solution separation device is a non-contact type, and the filament bundle does not have any contact with the equipment. The spinning solution separation device can effectively reduce the wear of the filament bundle in the high-speed washing process while increasing the separation effect of the filament bundle and the washing liquid. The washing equipment adopts a dense curtain type spraying device, and the spinning solution separation device is arranged in cooperation. The washing equipment can improve the washing effect and greatly reduce the wear, and realizes high-speed washing under high-speed spinning.

[0006] To solve the above technical problems, the basic idea of the technical scheme of the present application is as follows:

[0007] The first object of the present application is to provide a kind of cellulose fiber spinning liquid separation device, including the central passage for fiber bundle passing, air inlet cavity and exhaust cavity, the air inlet cavity and exhaust cavity are oppositely arranged on the two sides of central passage, and a plurality of through holes are respectively arranged on the wall between the air inlet cavity and exhaust cavity and central passage;When fiber bundle passes through central passage, gas enters central passage from air inlet cavity, sweeps fiber bundle, and then is discharged through exhaust cavity.

[0008] The liquid separation device of the present application, the fiber bundle passes through the central passage without any contact with the device, while increasing the separation effect of the fiber bundle and the washing liquid, effectively reducing the wear of the fiber bundle during high-speed washing, minimizing the fibrillation of the filament during post-processing, and achieving efficient washing of cellulose filaments at a spinning speed of 80-1000 m / min.

[0009] Further, with the fiber bundle advancing direction as the reference, the air inlet cavity is located on the upper side of the central passage, and the exhaust cavity is located on the lower side of the central passage;Or, the air inlet cavity is located on the lower side of the central passage, and the exhaust cavity is located on the upper side of the central passage.

[0010] Preferably, the air inlet cavity is located on the upper side of the central passage, and the exhaust cavity is located on the lower side of the central passage, the angle between the inlet direction of the gas in the air inlet cavity and the advancing direction of the fiber bundle is not greater than 45°, and the angle between the outlet direction of the gas in the exhaust cavity and the advancing direction of the fiber bundle is not greater than 30°.

[0011] The present application controls the angle between the direction of air inlet and air outlet and the advancing direction of the fiber bundle, which can avoid the adverse effects of excessive wind resistance on the fiber bundle, and can also effectively blow the fiber bundle to separate the liquid in the fiber bundle as soon as possible and improve the efficiency of subsequent washing.

[0012] Preferably, a porous uniform air plate is arranged at a position close to the central passage in the air inlet cavity to improve the uniformity of hot air flow.

[0013] Preferably, the inlet and outlet of the central passage are respectively provided with anti-wear guide members to prevent the fiber bundle from being worn.

[0014] Further, the gas circulation pipeline is also included, which is in communication with the air inlet of the air inlet cavity and the air outlet of the exhaust cavity respectively, so as to circulate and blow the gas in the central passage.

[0015] Preferably, a heat exchange device is arranged on the gas circulation pipeline, and the gas is heated after passing through the heat exchange device.

[0016] Further, in the liquid separation device, the speed of the hot air entering the central passage from the air inlet cavity is not less than 5 m / s, and the temperature is 60-90℃.

[0017] The second object of the present application is to provide a high-speed cellulose fiber washing device, comprising a plurality of washing zones arranged in series, each of which is provided with a fiber supporting member, and a dense curtain type spraying device above the supporting member for spraying liquid to the fibers for washing;

[0018] Preferably, the dense curtain type spraying device is arranged between each adjacent supporting member.

[0019] In the high-speed cellulose fiber washing device of the present application, in order to adapt to high-speed spinning, the spraying type washing liquid is used, and the non-contact liquid separation device is used, so as to reduce the abrasion of the fiber bundle, realize high-speed spinning washing, improve the washing efficiency, and ensure the fiber quality.

[0020] In a further aspect, the supporting member is a driving roller, and a plurality of parallel grooves are arranged on the driving roller, and the fibers in the parallel grooves are sprayed with the washing liquid by the dense curtain type spraying device.

[0021] The dense curtain type spraying device can ensure the uniformity and stability of the washing liquid on the driving roller, so that each fiber or each filament is washed uniformly and sufficiently. A plurality of fiber bundles can pass through the inside of the parallel grooves in parallel, so that the washing liquid can immerse the plurality of fiber bundles, and the plurality of fiber bundles can be washed simultaneously in parallel, the production efficiency is improved, and the impact and abrasion of the washing liquid on the fiber bundle are reduced, and the fiber quality is improved.

[0022] In a further aspect, the water outlet of the dense curtain type spraying device comprises a slit or a plurality of small holes, and the sprayed washing liquid forms a dense water curtain, and the width e covered by the water curtain is greater than the total width f of the fiber bundle on the driving roller.

[0023] Preferably, the distance d between adjacent small holes is not greater than 5mm.

[0024] Preferably, a plurality of dense curtain type spraying devices are arranged on each driving roller along the direction of the fiber bundle.

[0025] In a further aspect, the spraying direction of the dense curtain type spraying device is adjustable, and the spraying direction is arranged at an angle with the vertical plane in which the central axis of the driving roller is located, or the spraying direction is perpendicular to the horizontal plane in which the central axis of the driving roller is located.

[0026] Preferably, the spraying direction of the dense curtain type spraying device is perpendicular to the horizontal plane in which the central axis of the driving roller is located.

[0027] The third object of the present application is to provide a method for washing with the high-speed cellulose fiber washing device as described above, comprising: the fiber tow is guided into the washing area by the supporting member, the dense curtain type spraying device sprays the washing liquid to form a dense water curtain to exchange wash the fiber, then the fiber tow passes through the liquid separation device, the liquid is separated from the fiber tow, the fiber tow enters the next washing area, and the foregoing process is repeated.

[0028] Further, the temperature of the washing liquid in each washing area is 20-80℃; preferably 30-80℃.

[0029] It is found through experiments that the cellulose fiber can be stably spun by spraying and immersing the high-temperature washing liquid on the driving roller when passing through the washing device, and the washing effect is improved by the accelerated exchange speed between the fiber and the internal solvent of the washing liquid after being heated.

[0030] Preferably, the temperature of the washing liquid in each washing area gradually increases in the running direction of the fiber tow.

[0031] Preferably, the concentration of the washing liquid in each washing area gradually decreases in the running direction of the fiber tow.

[0032] In the present application, the spraying washing is performed by using the washing liquid with increased temperature, and the gradient washing liquid with gradually decreased concentration and gradually increased temperature is used in each washing area, so that the exchange speed between the fiber and the washing liquid is accelerated, and the washing efficiency is further improved. The shielding door is arranged in each washing area to form a closed space in the washing area, the low-concentration washing liquid is returned to the high-concentration washing area to realize recycling, the loss of the washing liquid and heat is reduced, and the cost is reduced.

[0033] After the above technical scheme is adopted, the present application has the following beneficial effects compared with the prior art:

[0034] 1. The liquid separation device for the cellulose fiber in the present application is non-contact type, the high-speed hot gas is introduced into the liquid separation device, the tow passes through the center channel without any contact with the device, so that the separation effect of the tow and the washing liquid is increased, the wear of the tow in the high-speed washing process is effectively reduced, the fibrillation of the long fiber in the post-processing process is reduced as much as possible, and the high-speed washing of the cellulose long fiber at a spinning speed of 80-1000 m / min can be realized.

[0035] 2、Lyocell fiber washing is realized by diffusion exchange between washing liquid and NMMO solvent inside and on the surface of the fiber, and frequent absorption and release of the washing liquid by the fiber can help improve the washing efficiency. The cellulose fiber washing equipment of the application sprays the washing liquid on the fiber tows by using the dense curtain type spraying device, increases the effective and sufficient contact of the tows with the washing liquid, improves the sufficiency and uniformity of the contact of different tow filaments with the liquid, and cooperates with the non-contact liquid separation device to remove the previous washing liquid, which is conducive to more efficient absorption of the washing liquid, thereby improving the washing efficiency. In this way, efficient and sufficient washing under high-speed spinning can be realized, and the wear of the fiber can be reduced, and the fiber quality can be improved.

[0036] 3、In the application, the spraying washing is carried out by using the washing liquid with increased temperature, and the gradient washing liquid with gradually reduced concentration and gradually increased temperature in different zones can accelerate the exchange speed of the fiber and the washing liquid, and is also conducive to further improving the washing efficiency. Each washing zone is provided with a shielding door, so that a closed space is formed in the washing zone, the low-concentration washing liquid returns to the high-concentration washing zone, recycling is realized, the loss of the washing liquid and heat is reduced, and the cost is reduced.

[0037] 4、The application not only improves the high-speed washing efficiency of the cellulose fiber, reduces the damage of the tow washing process to the fiber, but also reduces the loss of NMMO solvent in the washing liquid, and can be used for high-speed washing of the cellulose filament at a spinning speed of 200-800 m / min, and the NMMO solvent content in the fiber can be washed to below 0.01%. The method effectively reduces the investment and production cost, improves the stability and production efficiency in the production process, improves the product quality, and is more suitable for industrialization promotion.

[0038] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings are part of the present application and serve to provide a further understanding of the present application, the schematic embodiments of the present application and the description thereof serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creating laborious work. In the drawings:

[0040] Figure 1 The structure diagram of the non-contact liquid separation device provided by the application;

[0041] Figure 2 The flowchart of the high-speed washing of the cellulose fiber provided by the application;

[0042] Figure 3The structural schematic diagram of the cellulose fiber high-speed washing equipment provided by the application is shown in the figure;

[0043] Figure 4 The structural schematic diagram of the cellulose fiber high-speed washing equipment provided by the application is shown in the figure; Figure 3 The enlarged view of part A in the figure;

[0044] Figure 5 The structural schematic diagram of the dense curtain type spraying device provided by the application is shown in the figure;

[0045] Figure 6 The structural schematic diagram of the dense curtain type spraying device provided by the application is shown in the figure; Figure 5 The spraying schematic diagram of the dense curtain type spraying device provided by the application is shown in the figure;

[0046] Figure 7 The structural schematic diagram of the dense curtain type spraying device provided by the application is shown in the figure;

[0047] Figure 8 The spraying schematic diagram of the dense curtain type spraying device provided by the application is shown in the figure; Figure 7 The spraying schematic diagram of the dense curtain type spraying device provided by the application is shown in the figure;

[0048] In the figure, 1 is a central passage, 2 is an air inlet cavity, 21 is an air inlet, 3 is an air outlet cavity, 31 is an air outlet, 4 is a porous air distribution plate, 5 is a gas circulation pipeline, 6 is a supporting part, 61 is a driving roller, 7 is a dense curtain type spraying device, 71 is a water inlet, 72 is a water outlet, and 8 is a silk solution separation device.

[0049] It should be noted that the figures and the text description are not intended to limit the concept range of the application in any way, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments will be described clearly and completely below in combination with the figures of the embodiments of the application. The following embodiments are used to illustrate the application, but not to limit the scope of the application.

[0051] In the description of the application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0052] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] Embodiment one

[0054] Reference Figure 1 The present embodiment provides a kind of for cellulose fiber spinning silk solution separation device 8, including the center passage 1 that fiber tow passes through, gas inlet cavity 2 and exhaust cavity 3, the gas inlet cavity 2 and exhaust cavity 3 are oppositely arranged in the two sides of center passage 1, multiple through holes are respectively arranged on the wall between the gas inlet cavity 2 and exhaust cavity 3 and center passage 1;When fiber tow passes through center passage 1, gas enters center passage 1 from gas inlet cavity 2, sweeps fiber tow, then is discharged through exhaust cavity 3.

[0055] The silk solution separation device 8 of the present application is a non-contact silk solution separator, the high-speed hot gas flow at a certain angle with the direction of travel of the tow is introduced into the silk solution separator, the tow passes through the center passage 1 without any contact with the device, while increasing the separation effect of the tow and the washing liquid, the wear of the tow during high-speed washing can be effectively reduced, the fibrillation of the filament during post-processing can be reduced as much as possible, and efficient washing of the cellulose filament at a spinning speed of 80-1000 m / min can be realized.

[0056] In order to improve the efficiency of gas blowing fiber tow for silk solution separation, hot air can be introduced. That is, the gas inlet cavity 2 is a hot air introduction area, the center passage 1 is a tow passing area, and the exhaust cavity 3 is a gas discharge area. Hot air is introduced into the hot air introduction area, and the temperature and speed can be adjusted to better improve the efficiency of silk solution separation.

[0057] Further, with the direction of travel of the fiber tow as the reference, the gas inlet cavity 2 is located on the upper side of the center passage 1, and the exhaust cavity 3 is located on the lower side of the center passage 1. At this time, the inlet gas flow is in the same direction as the advancing direction of the fiber tow in the horizontal direction, and the included angle (acute angle) α1 between the introduction direction of the gas in the gas inlet cavity into the center passage and the advancing direction of the fiber tow is not greater than 45°.

[0058] Alternatively, the gas inlet cavity 2 can be located on the lower side of the center passage 1, and the exhaust cavity 3 can be located on the upper side of the center passage 1. At this time, the inlet gas flow is opposite to the advancing direction of the fiber tow in the horizontal direction, and the included angle (obtuse angle) between the introduction direction of the gas in the gas inlet cavity into the center passage and the advancing direction of the fiber tow is not less than 150°.

[0059] Preferably, the air inlet cavity 2 is located on the upper side of the central channel 1, and the air outlet cavity 3 is located on the lower side of the central channel 1, the angle between the air inlet direction in the air inlet cavity 2 and the running direction of the fiber bundle is not greater than 45°, and the angle between the air outlet direction in the air outlet cavity 3 and the running direction of the fiber bundle is not greater than 30°. This scheme has better blowing effect on the fiber bundle.

[0060] The present application can avoid the adverse effects of excessive wind resistance on the fiber bundle, and can also well blow the fiber bundle to separate the liquid in the fiber bundle as soon as possible and improve the efficiency of subsequent washing.

[0061] The air inlet cavity 2 is provided with a multi-hole uniform air plate 4 near the central channel 1 to improve the uniformity of hot air flow.

[0062] The air inlet cavity 2 is a semi-closed area, and is provided with a multi-hole uniform air plate 4 at the connection with the central channel 1, so that the air flow in the central channel 1 by the air inlet cavity 2 is more uniform and stable, and the blowing effect of the gas on each section of the fiber bundle is more uniform, ensuring uniformity.

[0063] In the present application, the air inlet cavity 2 and the air outlet cavity 3 are located on opposite sides of the central channel 1, and the gas entering the central channel 1 to blow the fiber bundle can be directly discharged, avoiding dead angles and causing turbulent air flow.

[0064] In the present application, the inlet and outlet of the central channel 1 are also respectively provided with wear-resistant guide members to prevent the fiber bundle from being abraded.

[0065] In the present application, the liquid separation device 8 further comprises a gas circulation pipeline 5, the gas circulation pipeline 5 is provided with a hot air source, and the gas circulation pipeline 5 is in communication with the air inlet 21 of the air inlet cavity 2 and the air outlet 31 of the air outlet cavity 3 respectively, so that the gas circulates to blow the fiber in the central channel 1.

[0066] As a preferred scheme, the gas circulation pipeline 5 is further provided with a heat exchange device to heat the hot air source or the gas in the gas circulation pipeline 5.

[0067] The hot air is extracted from the air outlet 31 of the air outlet cavity 3 and returned to the gas circulation pipeline 5 and the hot air source, heated by the heat exchange device, and then enters the air inlet cavity 2, so that the hot air forms a dynamic circulation in the liquid separator. The speed of the hot air is not less than 5m / s, and the temperature is 60-90℃.

[0068] The non-contacting filament liquid separation device 8 provided by the embodiment has wide application scenarios, can realize efficient washing of cellulose filaments at a spinning speed of 80-1000 m / min, and is especially suitable for high-speed washing of cellulose filaments at a spinning speed of 200-800 m / min, and can effectively avoid fiber abrasion.

[0069] Embodiment two

[0070] Reference Figures 2-5 The cellulose fiber high-speed washing equipment provided by the embodiment comprises a plurality of washing zones arranged in series, each washing zone is provided with a fiber supporting component 6, a dense curtain type spraying device 7 is arranged above the supporting component 6, and liquid is sprayed to the fiber for washing; and at least between adjacent washing zones, the filament liquid separation device 8 as described in embodiment one is arranged.

[0071] In the cellulose fiber high-speed washing equipment, in order to be suitable for high-speed spinning, the washing liquid is sprayed, and the non-contacting filament liquid separation device 8 as described in embodiment one is used, so that the abrasion of the filament bundle can be reduced, high-speed spinning washing can be realized, the washing efficiency can be improved, and the fiber quality can be ensured.

[0072] In the cellulose fiber high-speed washing equipment, the filament liquid separation device 8 can be arranged at any position where filament liquid separation is required. In order to ensure the washing effect, the filament liquid separation device 8 is arranged at least between adjacent washing zones. The filament liquid separator can separate the liquid in the filament bundle from the filament bundle, so that the filament bundle can efficiently absorb the washing liquid after entering the next washing zone, and the washing efficiency can be further improved.

[0073] As a preferred mode, the filament liquid separation device 8 is arranged between every two adjacent supporting components 6. In this way, after the fiber filament bundle is washed by the washing liquid sprayed by the dense curtain type spraying device 7, the filament liquid separation is performed, which is beneficial to absorbing the sprayed washing liquid next time, so that the washing efficiency can be improved.

[0074] The washing liquid in the embodiment can use the existing washing liquid in the prior art. Specifically, the NMMO aqueous solution is used in the embodiment.

[0075] In order to be more suitable for high-speed spinning, the supporting component 6 is a driving roller 61, a plurality of parallel grooves are distributed on the driving roller 61, the fiber in the parallel grooves is sprayed with the washing liquid by the dense curtain type spraying device 7, and the filament bundle in the parallel grooves is immersed.

[0076] The dense curtain type spraying device 7 can ensure the uniformity and stability of the washing liquid on the driving roller 61, so that each fiber or each bundle of filaments is washed uniformly and sufficiently. A plurality of bundles of filaments can pass through the driving roller 61 in parallel, pass through the inside of the parallel groove, and immerse the plurality of bundles of filaments in the washing liquid, so that the plurality of bundles of filaments can be washed in parallel, improve the production efficiency, and reduce the impact and wear of the washing liquid on the bundles of filaments, and improve the fiber quality.

[0077] In the embodiment, the washing liquid sprayed by the dense curtain type spraying device 7 forms a water curtain, which is uniformly dispersed in the range of the bundle area and basically covers the supporting part 6. A plurality of dense curtain type spraying devices 7 can be arranged on one supporting part 6. The spraying type application of the washing liquid under high-speed spinning can reduce the wear and impact of the washing liquid on the bundles of filaments.

[0078] The dense curtain type spraying device 7 is provided with a water inlet 71 and a water outlet 72. The water outlet 72 includes a slit or a plurality of small holes. The sprayed washing liquid forms a dense water curtain. The width e covered by the water curtain is greater than the total width f of the bundles of filaments on the driving roller 61.

[0079] Preferably, the distance d between adjacent small holes is not greater than 5 mm.

[0080] Specifically, the dense curtain type spraying can adopt various implementation manners.

[0081] Scheme 1, as shown in Figure 5 , a slit type spray head P1, the washing water enters the spray head from the upper side inlet under the action of pressure, and forms a uniform and dense fan-shaped water curtain (as shown in Figure 6 ) through the long slit below the spray head.

[0082] Scheme 2, as shown in Figure 7 , a pipe type spraying pipe structure P2, preferably the distance d between the water outlets of the spraying pipe is less than 5 mm. The water outlet is a round hole or a slit. A plurality of water outlets jointly form a dense rectangular water curtain (as shown in Figure 8 ).

[0083] It should be noted that the above is an example for illustration. The implementation manner of forming a dense water curtain is not limited to the above manner.

[0084] Further scheme, a plurality of dense curtain type spraying devices 7 are arranged on each driving roller 61 along the direction of the bundle of filaments, so as to increase the washing effect.

[0085] Further scheme, the spraying direction of the dense curtain type spraying device 7 is adjustable. As shown in Figure 5 and 7 , the spraying direction is arranged at an angle with the vertical plane in which the central axis of the driving roller 61 is located, or the spraying direction is perpendicular to the horizontal plane in which the central axis of the driving roller 61 is located.

[0086] Preferably, the dense curtain spray device 7 is located directly above the central axis of the active roller 61 and sprays downward, with the spraying direction being perpendicular to the central axis of the active roller 61, thus achieving a good water washing effect.

[0087] In this embodiment, a shielding door is arranged in each water washing zone to close the water washing zone. Since the high-temperature water washing liquid is used for water washing of the fiber bundle in the present application, the shielding door is arranged in each water washing zone to form a closed space in the water washing zone. The heat transfer of the water washing liquid at a certain temperature in the closed space causes the ambient temperature of the water washing zone to rise, which is beneficial to increasing the exchange effect of the water washing liquid and the fiber bundle. At the same time, the shielding door prevents the water washing liquid from splashing out, reduces the loss of the water washing liquid, and thus reduces the loss of NMMO in the production process.

[0088] In this embodiment, the multiple dense curtain water washing liquids can use one water washing liquid concentration, and the concentration of the subsequent water washing liquid gradually decreases, and then the low-concentration water washing liquid returns to the high-concentration water washing liquid to meet the system balance. The temperature of the water washing liquid can be room temperature. In order to improve the exchange rate, the temperature is preferably increased to 30-80°C, and the temperature of the subsequent water washing liquid is preferably gradually increased.

[0089] In addition, the present embodiment also provides a method for water washing by using the high-speed water washing equipment for cellulose fiber as described above, which comprises: guiding the fiber bundle into the water washing zone under the guidance of the supporting member 6, spraying the water washing liquid by the dense curtain spray device 7 to form a dense water curtain to exchange water washing of the fiber, then separating the liquid from the fiber bundle by the liquid separation device 8, and then guiding the fiber bundle into the next water washing zone, and then repeating the foregoing process.

[0090] In the above method, the speed of the hot air entering the central passage 1 from the air inlet cavity 2 in the liquid separation device 8 is not less than 5 m / s, and the temperature is 60-90°C.

[0091] In the above method, the temperature of the water washing liquid in each water washing zone is 20-80°C; and the temperature is preferably 30-80°C.

[0092] It is found through experiments that the cellulose fiber can be ensured to have stable spinning when passing through the water washing equipment by spraying and immersing the high-temperature water washing liquid on the active roller 61, the water washing liquid after being heated can accelerate the exchange speed with the internal solvent of the fiber, and thus the water washing effect is increased.

[0093] As a preferred embodiment, the temperature of the water washing liquid in each water washing zone gradually increases in the running direction of the fiber bundle. The concentration of the water washing liquid in each water washing zone gradually decreases in the running direction of the fiber bundle. In this way, the water washing liquid with gradually increasing temperature and gradually decreasing concentration can improve the water washing effect.

[0094] Specifically, the cellulose filaments are sprayed with high-temperature washing liquid by the dense curtain spraying device 7 when passing through the washing equipment of the present application, and the fiber tows on the driving roller 61 are immersed and washed, and the certain temperature increases the exchange efficiency of the washing liquid and the solvent inside the fiber, thereby increasing the washing effect; the liquid separator is arranged between each washing area or between the driving rollers 61, the liquid separator can separate the liquid inside the tow that has left the spraying area (i.e. will enter the next spraying area) from the tow, so that the tow can efficiently absorb the washing liquid after entering the next spraying area, further increasing the washing efficiency. The liquid separator is connected to a high-speed hot gas flow that is arranged at an angle to the advancing direction of the tow, and the tow does not contact the equipment, which can increase the separation effect of the tow and the washing liquid, avoid the wear of the tow in the high-speed washing process, minimize the fibrillation of the filaments in the post-processing process, and can realize efficient washing of the cellulose filaments at a spinning speed of 200-800 m / min.

[0095] Test Example One

[0096] The washing equipment of Example Two is used, as shown in Figure 3 At a high spinning speed, the washing equipment with multiple rollers is used to wash the filaments with a fineness of 200 dtex. The tubular spraying pipe structure is used, the distance between the water outlets is 3 mm, and the spraying water forms a rectangular curtain. The washing equipment is divided into four areas, and the washing liquid in the four areas is NMMO aqueous solution. The concentration is 20%, 12%, 4%, and 0% from front to back along the advancing direction of the tow, respectively. Different temperatures of washing liquid are used, different numbers of liquid separators are arranged, and other conditions are the same. The specific evaluation after washing and the fiber performance are shown in Table 1.

[0097] Table 1 Washing Degree Evaluation

[0098]

[0099]

[0100] Result Analysis:

[0101] 1. As shown in the results in Table 1, no liquid separator is arranged in Group 1 and Group 2, and the mass fraction of NMMO in the fiber is obviously higher than that in Group 3-Group 7 with the liquid separator, which shows that the liquid separator can improve the washing effect, greatly reduce the content of NMMO in the fiber, and obtain qualified fiber quality. Specifically, the liquid separator can be arranged between different concentration washing areas, but the washing effect is better when the liquid separator is arranged between each supporting part.

[0102] 2、 four zones can be set to 20℃, 40℃, 50℃, 60℃ respectively, and the washing effect is better than that of normal temperature washing. The number of washing zones can be increased, and the higher the spinning speed, the more washing zones. When the spinning speed is lower than 200 m / min, a contact type liquid separator can be selected, but when the spinning speed is higher than 200 m / min, a non-contact type liquid separator is used to reduce the wear of the yarn. The hot air speed, temperature and blowing direction of the non-contact type liquid separator can be adjusted according to the actual situation.

[0103] Test Example Two

[0104] In this test example, the test group uses the washing equipment of Example Two, and the method of Group 3 in Test Example One is used, and the spinning speed is adjusted according to Table 2. The difference between the control group and the test group is that the non-contact type separation device is replaced with a contact type separation device, specifically a compression roller, and the spinning speed is also adjusted according to Table 2. The wet rubbing time is used to represent the degree of fibrillation of the fiber, and the shorter the wet rubbing time, the higher the degree of fibrillation of the fiber. The fiber washing results are shown in Table 2.

[0105] Table 2 Degree of fibrillation of fiber

[0106]

[0107] As shown in the results of Table 2, when the spinning speed is 100 m / min, the wet rubbing time of the test group is slightly longer, and is basically equivalent to that of the control group, indicating that the degree of fibrillation of the two is not much different; when the spinning speed is 200 m / min, the wet rubbing time of the test group is greater than that of the control group, indicating that the degree of fibrillation of the test group is lower than that of the control group; and when the spinning speed reaches 400 m / min, the wet rubbing time of the test group is much greater than that of the control group, being twice that of the control group, indicating that the degree of fibrillation of the test group is much lower than that of the control group. It is shown that the non-contact type liquid separator of the present application can greatly reduce the degree of fibrillation of the fiber during high-speed spinning, and can ensure the quality of the fiber during high-speed spinning washing.

[0108] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiments, it is not intended to limit the present application, and any skilled person in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application are still within the scope of the present application.

Claims

1. A high speed water washing apparatus for cellulosic fibres comprising a plurality of water washing zones arranged in series, each water washing zone being provided with a support member for the fibres, characterised in that, The supporting component is a driving roller, a plurality of parallel grooves are distributed on the driving roller, the traveling fiber is located in the parallel grooves, a dense curtain type spraying device is arranged above the supporting component, and the fiber is sprayed with a water washing liquid to immerse the fiber tows in the parallel grooves and perform water washing; At least between adjacent water washing zones, a fiber liquid separation device is arranged; the fiber liquid separation device comprises a central passage through which the fiber tows pass, an air inlet cavity and an air outlet cavity, the air inlet cavity and the air outlet cavity are oppositely arranged on two sides of the central passage, and a plurality of through holes are respectively arranged on the walls between the air inlet cavity, the air outlet cavity and the central passage; when the fiber tows pass through the central passage, air enters the central passage from the air inlet cavity to blow the fiber tows, and then is discharged through the air outlet cavity; An included angle α1 between a direction in which the air in the air inlet cavity enters the central passage and a direction in which the fiber tows travel is not greater than 45°, and an included angle α2 between a direction in which the air in the air outlet cavity is discharged and the direction in which the fiber tows travel is not greater than 30°; A multi-hole uniform air distribution plate is arranged at a position close to the central passage in the air inlet cavity.

2. The cellulosic fiber high-speed water washing apparatus according to claim 1, characterized by, With reference to the direction in which the fiber tows travel, the air inlet cavity is located on the upper side of the central passage, and the air outlet cavity is located on the lower side of the central passage; or the air inlet cavity is located on the lower side of the central passage, and the air outlet cavity is located on the upper side of the central passage.

3. The high speed cellulosic fiber washing apparatus according to claim 1, wherein, The inlet and the outlet of the central passage are respectively provided with wear-resistant guide members.

4. The high speed cellulosic fiber washing apparatus according to claim 1, wherein A gas circulation pipeline is further arranged, which is in communication with the air inlet of the air inlet cavity and the air outlet of the air outlet cavity to circulate air to blow the fiber in the central passage.

5. The cellulosic fiber high-speed water washing apparatus according to claim 4, characterized by The gas circulation pipeline is provided with a heat exchange device, and the air is heated after passing through the heat exchange device.

6. The cellulosic fibre high-speed washing apparatus according to any one of claims 1 to 5, characterized in that, The fiber liquid separation device is arranged between each adjacent supporting component.

7. The cellulosic fibre high-speed washing apparatus according to any one of claims 1 to 5, characterized in that, The water outlet of the dense curtain type spraying device comprises a slit or a plurality of small holes, the sprayed water washing liquid forms a dense water curtain, and the width e covered by the water curtain is greater than the total width f of the fiber tows on the driving roller.

8. The cellulosic fiber high-speed water washing apparatus according to claim 7, characterized by, The distance d between adjacent small holes is not greater than 5 mm.

9. The cellulosic fibre high-speed washing apparatus according to any one of claims 1 to 5, characterized in that, A plurality of dense curtain type spraying devices are arranged on each driving roller along the direction in which the fiber tows travel.

10. The cellulosic fiber high-speed water washing apparatus according to any one of claims 1 to 5, characterized by, The spraying direction of the dense curtain type spraying device is adjustable, and the spraying direction is arranged at an angle with respect to the vertical plane in which the central axis of the driving roller is located, or the spraying direction is perpendicular to the horizontal plane in which the central axis of the driving roller is located.

11. A method of washing with the high-speed cellulose fiber washing apparatus according to any one of claims 1 to 10, characterized by, The fiber tows enter the water washing zone under the guidance of the supporting component, the dense water curtain formed by the dense curtain type spraying device spraying the water washing liquid exchanges and washes the fiber, then the fiber tows pass through the fiber liquid separation device, the liquid is separated from the fiber tows, the fiber tows enter the next water washing zone, and the foregoing process is repeated.

12. The method of claim 11, wherein, The temperature of the water washing liquid in each water washing zone is 20-80 ℃.

13. The method of claim 12, wherein, The temperature of the water washing liquid in each water washing zone is 30-80 ℃.

14. The method according to any one of claims 11-13, characterized in that, In the direction in which the fiber tows travel, the temperature of the water washing liquid in each water washing zone gradually increases.

15. The method according to any one of claims 11-13, characterized in that, In the direction in which the fiber tows travel, the concentration of the water washing liquid in each water washing zone gradually decreases.

16. The method of any one of claims 11-13, wherein, In the fiber liquid separation device, the speed of the hot air entering the central passage from the air inlet cavity is not less than 5 m / s, and the temperature is 60-90 ℃.

17. The method of any one of claims 11-13, wherein, The spinning speed is 80-1000 m / min.

18. The method of any one of claims 11-13, wherein, The spinning speed is 200-800 m / min.

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