Device for rapidly preparing lyocell cross-linked short fibers

Abstract

The utility model relates to the technical field of fiber preparation, in particular to a device for quickly preparing lyocell cross-linked short fibers, which comprises a tank body insulating layer and a rack insulating layer, the tank body insulating layer is rotatably arranged on the rack insulating layer, and the tank body insulating layer is formed by arranging a feeding channel insulating layer on the tank body insulating layer. A stirring unit thermal insulation layer is arranged in the tank body thermal insulation layer, and the tank body thermal insulation layer is coated with a heating unit thermal insulation layer; when the lyocell cross-linked short fibers are prepared by the device, the short fibers and a cross-linking agent solution are put into the tank body, so that the steps of soaking, heating and washing in the traditional process can be carried out in one tank body, the equipment cost and the operation difficulty are effectively reduced, the soaking and the heating can be simultaneously carried out, the preparation process is optimized, and the quality of the lyocell cross-linked short fibers is improved. The lyocell cross-linked short fibers can be prepared at a time under the condition that time and temperature are well controlled, and compared with the prior art which needs multiple padding reactions, the equipment can greatly improve the efficiency of preparing the cross-linked short fibers.

Description

Technical Field

[0001] The utility model relates to the technical field of fiber preparation, and specifically provides a device for rapidly preparing lyocell cross-linked short fibers. Background Art

[0002] Lyocell fiber is called the new type of green fiber in the 21st century. It is a cellulose fiber with high crystallinity, high orientation, low energy consumption, no pollution in the production process, and can be naturally degraded. It has excellent performance and wide applications. However, due to the weak transverse binding force between the microfibrils of lyocell fiber, it is extremely prone to fibrillation in the wet state. Severe fibrillation will lead to difficulties in downstream spinning and non-woven fabric production, and the downstream applications are restricted.

[0003] Therefore, the preparation of lyocell cross-linked fiber requires adding a cross-linking process to the conventional production process to enhance its anti-fibrillation performance. Currently, in the cross-linking process for preparing lyocell cross-linked short fibers, usually the washed fiber filament bundle is immersed in the cross-linking agent solution or the cross-linking agent solution is sprayed on the fiber filament bundle, and then enters a high-temperature device for cross-linking reaction. The cross-linked filament bundle after the cross-linking reaction is washed, oiled, dried and then cut into short fibers to obtain the cross-linked short fibers. Using this traditional process requires multiple devices and steps such as impregnation equipment, heating equipment, and washing equipment, with high equipment costs and cumbersome operations. Therefore, a device that can optimize the preparation process of lyocell cross-linked fiber and rapidly prepare lyocell cross-linked short fibers is proposed. Summary of the Utility Model

[0004] The utility model provides a device for rapidly preparing lyocell cross-linked short fibers, which optimizes the preparation process of lyocell cross-linked fiber, reduces and integrates some process steps, can ensure that the prepared lyocell cross-linked short fibers have good anti-fibrillation performance, and effectively improves the preparation speed of lyocell cross-linked short fibers.

[0005] The technical solution of the utility model is as follows:

[0006] A device for rapidly preparing lyocell cross-linked short fibers includes a tank body and a frame. The tank body is rotatably arranged on the frame. The tank body is provided with a feed channel, and a stirring unit is arranged inside the tank body, and a heating unit is coated outside the tank body.

[0007] In this solution, uncrosslinked short fibers and a crosslinking agent solution can be put into the tank from the feeding channel. Through the heating of the tank heating unit and the stirring of the stirring unit, the short fibers and the crosslinking agent can be easily and fully mixed in the tank for crosslinking reaction. After the crosslinking reaction is completed, the waste liquid can be discharged, and then deionized water is added to the tank for washing. Finally, Lyocell crosslinked short fibers with good fibrillation performance can be obtained. This solution enables the steps of soaking (padding), heating, and washing in the traditional process to be carried out in one device, effectively reducing the equipment cost and operation difficulty. At the same time, soaking (padding) and heating can be carried out simultaneously, optimizing the preparation process. Under the condition of controlling the time and temperature, the Lyocell crosslinked short fibers can also be prepared at one time. Compared with the existing process that requires multiple padding reactions, the use of this device greatly improves the preparation efficiency.

[0008] It should be noted that in this solution, long fiber bundles need to be cut into short fibers first, and a crosslinking agent solution containing an alkali agent and a salt agent needs to be prepared in advance.

[0009] Preferably, a main shaft is provided on the tank body. The main shaft penetrates the tank body, and the tank body can rotate around the main shaft. Both ends of the main shaft are arranged on the frame through bearing seats.

[0010] Preferably, a first cylindrical convex part is provided on one side of the tank body. A gear ring is fixedly arranged on the outer surface of the first cylindrical convex part. The axis of the gear ring coincides with the axis of the main shaft. A gear shaft meshing with the gear ring is provided on the frame, and the gear shaft is driven by a first motor unit.

[0011] In this solution, the tank body can be driven by the first motor unit and rotate around the main shaft. Through rotation, the sedimentation and accumulation of short fibers in the tank can be effectively avoided, and the short fibers and the crosslinking agent solution can be more fully mixed and reacted.

[0012] Preferably, the first motor unit includes a first motor arranged on the frame. The output end of the first motor is connected with a reduction wheel through a belt drive, and the reduction wheel is coaxially arranged with the gear shaft.

[0013] Preferably, a second cylindrical convex part is provided on the other side of the tank body. A sliding groove is circumferentially arranged on the second cylindrical convex part. The annular axis formed by the sliding groove coincides with the axis of the main shaft. A support wheel is provided on the frame, and the support wheel supports the second cylindrical convex part. The support wheel is arranged in the sliding groove.

[0014] In this solution, when one side of the tank body rotates, the second cylindrical convex part is supported by the support wheel and slides in the sliding groove, which can make the rotation of the tank body more stable. At the same time, the support wheel can also play an auxiliary supporting role for the tank body, reducing the stress on the bearing seat and the main shaft.

[0015] Preferably, the stirring unit includes blades disposed on the main shaft. The blades are evenly arranged on the main shaft, and the length of the blades gradually decreases from the center of the main shaft towards both ends of the main shaft.

[0016] Preferably, one end of the main shaft is driven by a second motor unit. The second motor unit includes a second motor disposed on the frame. The second motor is connected to a reducer through a belt drive, and the reducer is connected to the main shaft through a coupling.

[0017] In this solution, the blades of the stirring unit are evenly distributed along the inner diameter of the tank and vary in length, reducing the dead corners of stirring. At the same time, the fluid composed of short fibers and crosslinking agent solution in the tank can be more fully stirred and mixed by the stirring unit. By continuously stirring, the by-products of the crosslinking reaction are prevented from affecting the reaction of the short fibers, enabling the short fibers to always be in full contact with the crosslinking agent. At the same time, by the rotation of the tank body, while reducing the sedimentation of short fibers, the material forms a circulating flow in the tank, thus achieving a better mixing effect.

[0018] Preferably, the heating unit includes a heating housing. A heating channel is provided in the heating housing, and a heat medium is introduced into the heating channel. A heat insulation layer is coated outside the heating housing.

[0019] In this solution, heating and heat preservation of the inside of the tank by the heating housing can improve the effect and rate of the crosslinking reaction inside the tank.

[0020] Preferably, the feed channel is provided with a switch structure. The feed channel includes a fiber outlet / inlet, a crosslinking agent solution injection port, and a waste liquid discharge port. A filter structure is provided in the waste liquid discharge port.

[0021] In this solution, the switch structure can control the opening and closing of the feed channel. At the same time, the fiber outlet / inlet and the crosslinking agent solution injection port are separately arranged, which is also convenient for putting both into the tank at the same time and more convenient for taking out the short fibers.

[0022] Preferably, temperature sensors are provided in the heating unit and the tank.

[0023] In this solution, the temperature sensors can sense and detect the heating temperature of the heating unit and the reaction temperature inside the tank. By detecting the temperatures of both, the temperature required for the crosslinking reaction inside the tank can be well regulated, ensuring that the short fibers have good antigen fibrillation performance after the crosslinking reaction.

[0024] The beneficial effects of the present utility model:

[0025] When preparing Lyocell cross-linked staple fibers by the present utility model, the staple fibers and the cross-linking agent solution are put into a tank body, so that the steps of soaking (padding), heating, and water washing in the traditional process can all be carried out in one tank body, effectively reducing the equipment cost and operation difficulty. At the same time, soaking (padding) and heating can be carried out simultaneously, optimizing the preparation process. Under the condition of controlling the time and temperature, the Lyocell cross-linked staple fibers can also be prepared at one time. Compared with the existing process that requires multiple padding reactions, using this equipment can greatly improve the efficiency of preparing cross-linked staple fibers. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 Front view of the present utility model;

[0028] Figure 2 Left view of the present utility model;

[0029] Figure 3 For the present utility model Figure 1 Cross-sectional view taken along A-A in;

[0030] Figure 4 Right view of the present utility model;

[0031] Figure 5 Cross-sectional view of the tank body of the present utility model;

[0032] Figure 6 For the present utility model Figure 5 Enlarged view at B in;

[0033] Figure 7 Side cross-sectional view of the present utility model;

[0034] In the above-mentioned drawings, the corresponding reference numerals are shown as follows:

[0035] 1 - Tank body, 11 - Feed channel, 111 - Fiber inlet / outlet, 112 - Crosslinking agent solution injection port, 113 - Waste liquid discharge port, 114 - Filter screen, 12 - Stirring unit, 121 - Main shaft, 122 - Bearing seat, 123 - Paddle, 13 - Heating unit, 131 - Heating housing, 132 - Heating channel, 133 - Thermal insulation layer, 14 - First cylindrical convex part, 141 - Gear ring, 142 - Gear shaft, 143 - First motor unit, 1431 - First motor, 1432 - Reduction gear, 15 - Second cylindrical convex part, 151 - Sliding groove, 152 - Support wheel, 153 - Second motor unit, 1531 - Second motor, 1532 - Reducer, 1533 - Coupling, 2 - Frame. Detailed implementation manner

[0036] In combination with the accompanying drawings, through the specific implementation manner of the embodiments of the present invention, the technical solutions of the present invention are clearly and completely described.

[0037] As Figure 1 shown, a device for rapidly preparing Lyocell crosslinked short fibers includes a tank body 1 and a frame 2. The tank body 1 is rotatably arranged on the frame 2. The tank body 1 is provided with a feed channel 11 on the tank body 1, a stirring unit 12 is arranged inside the tank body 1, and a heating unit 13 is covered outside the tank body 1.

[0038] Specifically, the tank body 1 is preferably spherical. The uncrosslinked short fibers and the crosslinking agent solution are put into the tank body 1 from the feed channel 11. Through the heating of the heating unit 13 of the tank body 1 and the stirring of the stirring unit 12, the short fibers and the crosslinking agent are easily and fully mixed in the tank body 1 for crosslinking reaction. After the crosslinking reaction is completed, the waste liquid can be discharged, and then deionized water is added to the tank body 1 for washing. Finally, Lyocell crosslinked short fibers with good anti-fibrillation performance can be obtained. This solution enables the soaking (padding), heating, and washing steps in the traditional process to be carried out in one device, effectively reducing the equipment cost and operation difficulty. At the same time, soaking (padding) and heating can be carried out simultaneously, optimizing the preparation process. Under the condition of controlling the time and temperature, the Lyocell crosslinked short fibers can be prepared at one time. Compared with the existing process that requires multiple padding reactions, the use of this device greatly improves the preparation efficiency.

[0039] It should be noted that this solution requires cutting the long fiber bundle into short fibers first and pre-configuring the crosslinking agent solution containing an alkali agent and a salt agent.

[0040] The following embodiments provide different structures of the tank body 1. At the same time, in the following embodiments, between the tank body 1 and the stirring unit 12, the stirring unit 12 can be fixed relative to the frame 2, and only the tank body 1 rotates; the tank body 1 can be fixed relative to the frame 2, and the stirring unit 12 inside the tank body 1 rotates; or both rotate in opposite directions.

[0041] Example 1:

[0042] In this embodiment, as Figure 1 , Figure 5 and Figure 7 shown, a main shaft 121 is provided on the tank body 1, the main shaft 121 penetrates the tank body 1, the tank body 1 can rotate around the main shaft 121, and both ends of the main shaft 121 are arranged on the frame 2 through bearing seats 122.

[0043] Furthermore, a first cylindrical convex part 14 is arranged on one side of the tank body 1, a gear ring 141 is fixedly arranged on the outer surface of the first cylindrical convex part 14, the axis of the gear ring 141 coincides with the axis of the main shaft 121, a gear shaft 142 meshing with the gear ring 141 is arranged on the frame 2, and the gear shaft 142 is driven by a first motor unit 143.

[0044] Specifically, as Figure 4 shown, the first driving unit drives the gear shaft 142 to rotate, the gear shaft 142 meshes with the gear ring 141 on the tank body 1, so that the tank body 1 rotates around the axis of the main shaft 121. At the same time, the first motor unit 143 includes a first motor 1431 arranged on the frame 2. The first motor 1431 preferably adopts a servo motor, which can more accurately control the rotation speed and start / stop. The output end of the first motor 1431 is connected with a reduction wheel 1432 through a belt drive, the reduction wheel 1432 is coaxially arranged with the gear shaft 142, and the reducer 1532 converts the high-speed rotation of the first motor 1431 into a low-speed and stable rotation. By rotating, it can effectively avoid the sedimentation and accumulation of short fibers in the tank body 1, and also make the short fibers and the cross-linking agent solution mix and react more fully.

[0045] Even further, as Figure 3 shown, a second cylindrical convex part 15 is arranged on the other side of the tank body 1, a sliding groove 151 is circumferentially arranged on the second cylindrical convex part 15, the annular axis formed by the sliding groove 151 coincides with the axis of the main shaft 121, a support wheel 152 is arranged on the frame 2, the support wheel 152 supports the second cylindrical convex part 15, and the support wheel 152 is arranged in the sliding groove 151.

[0046] Specifically, convex parts are arranged at both ends of the tank body 1. One end is driven by a gear rack and a gear shaft 142, and the other end is in rotational contact with the support wheel 152. One side of the tank body 1 rotates. By supporting the second cylindrical convex part 15 with the support wheel 152 and sliding in the sliding groove 151, the rotation of the tank body 1 can be made more stable. At the same time, the support wheel 152 can also play an auxiliary supporting role for the tank body 1, reducing the force on the bearing seat 122 and the main shaft 121.

[0047] Further, a switch structure is provided in the feed channel 11. The feed channel 11 includes a fiber inlet / outlet 111, a crosslinking agent solution injection port 112, and a waste liquid discharge port 113. A filter screen 114 structure is provided in the waste liquid discharge port 113 to prevent short fibers from being discharged when discharging waste liquid.

[0048] Specifically, the switch structure can control the opening and closing of the feed channel 11. At the same time, the fiber inlet / outlet 111 and the crosslinking agent solution injection port 112 are separately arranged, which is also convenient for putting both into the tank body 1 at the same time and more convenient for taking out short fibers.

[0049] Embodiment 2:

[0050] On the basis of Embodiment 1, a structure of a stirring unit 12 is provided as Figure 5 and Figure 7 shown. The stirring unit 12 includes blades 123 arranged on the main shaft 121. The blades 123 are evenly arranged on the main shaft 121, and the length of the blades 123 gradually becomes shorter from the center of the main shaft 121 to both ends of the main shaft 121. The blades 123 of the stirring unit 12 are evenly distributed along the length of the inner diameter of the tank body 1, reducing the stirring dead corners. At the same time, the fluid composed of short fibers and crosslinking agent solution in the tank body 1 can be more fully stirred and mixed by the stirring unit 12. By continuously stirring, the by-products of the crosslinking reaction are prevented from affecting the reaction of short fibers, so that the short fibers are always in full contact with the crosslinking agent; at the same time, by the rotation of the tank body 1, while reducing the sedimentation of short fibers, the material forms a circulating flow in the tank body 1, thereby achieving a better mixing effect.

[0051] It should be noted that the structure of the blades 123 of the stirring unit 12 can also be spiral paddle strips that fit the inside of the tank body 1. At the same time, in order to prevent short fibers from hanging on the blades 123, corresponding rounded corner structures can be provided at the joints of each corner of the blades 123.

[0052] Further, as Figure 2 shown, one end of the main shaft 121 is driven by a second motor unit 153. The second motor unit 153 includes a second motor 1531 arranged on the frame 2. The second motor 1531 is connected to a reducer 1532 through a belt drive, and the reducer 1532 is connected to the main shaft 121 through a coupling 1533. The second motor 1531 is also a servo motor. At the same time, the driving method of the second motor unit 153 can be the same as that of the first motor unit 143, and both are decelerated through a deceleration turntable.

[0053] Embodiment 3:

[0054] On the basis of the above embodiments, a structure of a heating unit 13 is provided, as Figure 6As shown, the heating unit 13 includes a heating housing 131, in which a heating channel 132 is provided. A heat medium is introduced into the heating channel 132. An insulating layer 133 is coated outside the heating housing 131. The insulating material used for the insulating layer 133 preferably uses an aerogel film. At the same time, this insulating layer 133 is detachably arranged. When insulation is not required, the insulating layer 133 is unloaded and the heat medium is discharged to cool the tank body 1. Similarly, the tank body 1 can also be cooled by passing a refrigerant. And the heating channel 132 is arranged around the surface of the tank body 1. Through multi-channel series or parallel arrangement, an inlet and a discharge port are provided. The heat source therein includes but is not limited to hot air, high-pressure hot water, etc. Similarly, a heat film, such as a silicone heat film, a semiconductor heat film, etc., can also be directly arranged in the heating housing 131 for heating and temperature control. By heating and insulating the inside of the tank body 1 through the heating housing 131, the effect and rate of the cross-linking reaction inside the tank body 1 can be improved. And since the heating reaction time generally does not exceed 30 minutes and there is the insulating layer 133 for heat preservation, when using the heat medium for heating, a continuously circulating heat source does not need to be provided.

[0055] Furthermore, temperature sensors are provided in the heating unit 13 and the tank body 1.

[0056] Specifically, the temperature sensors transmit temperature data to a processing unit and a display unit provided on the frame 2, which is convenient for the operator to observe. The temperature sensors can sense and detect the heating temperature of the heating unit 13 and the reaction temperature inside the tank body 1. By detecting the temperatures of both, the temperature required for the cross-linking reaction inside the tank body 1 can be well regulated, ensuring that the short fibers have good fibrillation resistance performance after the cross-linking reaction.

[0057] Specific process of the device:

[0058] The prepared and preheated cross-linking agent solution and the cut short fibers are respectively fed from the cross-linking agent solution injection port 112 and the fiber inlet / outlet 111. After sealing the feed channel 11, a heat medium at a set temperature is introduced into the heating unit 13, and then the stirring unit 12 on the tank body 1 is started. It works for a preset time according to the set temperature and stirring speed to complete the cross-linking reaction. Then, the waste liquid discharge port 113 is turned downward, and the reacted cross-linking agent solution is discharged. Subsequently, the waste liquid discharge port 113 is closed; deionized water is input from the cross-linking agent solution injection port 112 for a water washing operation. If the temperature needs to be controlled during the water washing, a heat medium at the corresponding temperature is re-introduced into the heating unit 13. After the water washing is completed, the prepared Lyocell cross-linked short fibers are taken out from the fiber inlet / outlet 111.

[0059] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. A device for rapidly preparing lyocell cross-linked staple fibers, characterized in that: The invention comprises a tank body (1) and a frame (2), wherein the tank body (1) is rotatably arranged on the frame (2), a feeding channel (11) is arranged on the tank body (1), a stirring unit (12) is arranged inside the tank body (1), and a heating unit (13) is coated on the outside of the tank body (1).

2. The device for rapidly preparing lyocell cross-linked staple fibers according to claim 1, characterized in that: The tank body (1) is provided with a main shaft (121), the main shaft (121) passes through the tank body (1), the tank body (1) can rotate around the main shaft (121), and both ends of the main shaft (121) are arranged on the frame (2) through bearing seats (122).

3. The device for rapidly preparing lyocell cross-linked staple fibers according to claim 2, characterized in that: A first cylindrical protrusion (14) is provided on one side of the tank body (1); a gear ring (141) is fixedly provided on the outer surface of the first cylindrical protrusion (14); the axis of the gear ring (141) coincides with the axis of the main shaft (121); a gear shaft (142) meshing with the gear ring (141) is provided on the frame (2); and the gear shaft (142) is driven by a first motor unit (143).

4. The device for rapidly preparing lyocell cross-linked staple fibers according to claim 3, characterized in that: The first motor unit (143) comprises a first motor (1431) arranged on a frame (2); an output end of the first motor (1431) is connected to a reduction wheel (1432) via a belt drive; the reduction wheel (1432) is coaxially arranged with the gear shaft (142).

5. The device for rapidly preparing lyocell cross-linked staple fibers according to claim 3, characterized in that: A second cylindrical protrusion (15) is arranged on the other side of the tank body (1), and a circle of sliding grooves (151) are arranged on the circumference of the second cylindrical protrusion (15), and the annular axis formed by the sliding grooves (151) coincides with the axis of the main shaft (121); a supporting wheel (152) is arranged on the frame (2), and the supporting wheel (152) supports the second cylindrical protrusion (15), and the supporting wheel (152) is arranged in the sliding groove (151).

6. A device for rapidly preparing lyocell cross-linked staple fibers according to any one of claims 2 to 5, characterized in that: The stirring unit (12) comprises a paddle (123) arranged on the main shaft (121); the paddle (123) is evenly arranged on the main shaft (121); and the length of the paddle (123) gradually shortens from the center of the main shaft (121) to both ends of the main shaft (121).

7. The device for rapidly preparing lyocell cross-linked staple fibers according to claim 2, characterized in that: One end of the main shaft (121) is driven by a second motor unit (153); the second motor unit (153) comprises a second motor (1531) arranged on the frame (2); the second motor (1531) is connected to a reducer (1532) via a belt drive; the reducer (1532) is connected to the main shaft (121) via a coupling (1533).

8. The device for rapidly preparing lyocell cross-linked staple fibers according to claim 1, characterized in that: The heating unit (13) comprises a heating shell (131), a heating channel (132) is provided in the heating shell (131), a heat medium flows into the heating channel (132), and the outside of the heating shell (131) is coated with a thermal insulation layer (133).

9. The device for rapidly preparing lyocell cross-linked staple fibers according to claim 1, characterized in that: The feed channel (11) is provided with a switch structure, and the feed channel (11) comprises a fiber inlet / outlet (111), a crosslinking agent solution injection port (112) and a waste liquid discharge port (113), and a filter screen (114) structure is provided in the waste liquid discharge port (113).

10. The device for rapidly preparing lyocell cross-linked staple fibers according to claim 8, characterized in that: The heating unit (13) and the tank body (1) are provided with temperature sensors.

Images