Impregnation swelling process and system for fibers

Abstract

The invention relates to an impregnation swelling process and system for fibers, the impregnation swelling process comprises a cellulose pulp board impregnation process and a pulp porridge preparation process, the cellulose pulp board impregnation process is characterized in that a pulp board is fully impregnated with an NMMO solution under the condition that the pulp board is not crushed and comprises a first impregnation stage, a second impregnation stage and a third impregnation stage, in the first impregnation stage, a pulp board is integrally impregnated below the liquid level of a solvent solution in an impregnation tank, in the second impregnation stage, permeation of a solvent in the pulp board is increased by adopting a mode of extruding the pulp board, and in the third impregnation stage, the ratio of the solvent to fibers in the impregnated pulp board is adjusted, so that the mass ratio of the solvent to the fibers in the pulp board meets the process requirement; the slurry porridge preparation process comprises the following steps: crushing a slurry board into slurry porridge by using a primary crusher; according to the process, the process that the pulp board which is not crushed and the solvent are firstly used for soaking, and then the pulp board which is fully soaked and swelled is crushed to prepare the pulp porridge is adopted, so that the defects in the prior art can be effectively overcome.

Description

Technical Field

[0001] The invention relates to the technical field of regenerated cellulose fiber production, and in particular to an impregnation and swelling process and system for fibers. Background Art

[0002] Lyocell fiber (abbreviated as Lyocell) is a synthetic fiber made from wood pulp fiber. The difference from other synthetic fibers is that the solvent used to produce Lyocell fiber is an environmentally friendly solvent (the solvent is usually NMMO solution (N-methylmorpholine-oxide)), the solvent can be regenerated and recycled, and Lyocell has the characteristics of environmental protection, no pollution, excellent product performance, etc., and its application range is becoming more and more extensive.

[0003] The existing Lyocell fiber production process usually includes the steps of mixing NMMO solution with cellulose pulp for swelling (impregnation swelling), dissolution, filtration, spinning and NMMO recovery, among which swelling is a relatively important step. At present, there are usually three ways of dry swelling process for Lyocell fiber production:

[0004] The first method is that a special machine processes dry pulp board (referred to as pulp or pulp board) into small pulp blocks, which are weighed and put into a paddle mixer via a conveyor belt. At the same time, NMMO solution (solvent) is sprayed into the paddle mixer in proportion to mix the crushed pulp with the NMMO solution. After that, the paddle mixer rotates to mix the materials while pushing them into the screw pump hopper, and then they are sent to the pre-dissolution kettle through the screw pump. The pre-dissolution kettle is further stirred to allow the fibers to be fully immersed and swollen with the solvent to form pulp porridge. Finally, the pulp porridge is sent to the thin film evaporator through the screw pump for vacuum dehydration and dissolution.

[0005] The second method is to add a certain amount of NMMO solution (solvent) into a high-concentration pulper, rotate the spiral impeller of the high-concentration pulper, and then add a certain amount of cellulose dry pulp (or pulp board) into the high-concentration pulper. The pulp becomes soft due to the contact with the solvent, and the rotation of the spiral impeller pulverizes the impregnated pulp so that it can be further fully mixed with the solvent to achieve the purpose of swelling.

[0006] The third method is to add dry pulp and solvent (NMMO solution) into a papermaking ball in proportion. As the ball rotates, the pulp and solvent are fully mixed and crushed to achieve the purpose of swelling.

[0007] However, in actual use, the three existing swelling methods all have some shortcomings. For example, in the first method, the dry pulp pulverizing process has high energy consumption and heavy dust, which pollutes the environment; at the same time, there is also the problem of uneven pulverizing; in addition, there is a mixing dead corner in the process of mixing the pulverized pulp with the solvent, which is prone to uneven mixing; in the second method, the immersion swelling process has high energy consumption and can only be produced intermittently; in the third method, not only can it only be produced intermittently, but the lid must be opened and locked for each pot of production, which is cumbersome to operate and there is also the problem of unclean material pouring. In addition, the existing swelling method is difficult to ensure that the mass ratio of fiber to solvent in the pulp porridge meets the process requirements, which is not conducive to improving the quality of lyocell fiber and needs to be solved urgently. Summary of the invention

[0008] The first aspect of the present invention is to solve the above technical problems and provide a new idea of ​​impregnation and swelling. The process of first impregnating a pulp sheet without crushing with a solvent and then crushing the fully impregnated and swollen pulp sheet to make pulp porridge can not only avoid the huge disadvantages of dust pollution, uneven crushing, and power consumption caused by crushing the dry pulp sheet, but also ensure that the pulp sheet absorbs the solvent uniformly and expands uniformly, and can realize continuous feeding and continuous production, and can ensure that the mass ratio of fiber to solvent meets the process requirements. The main concept is:

[0009] A fiber impregnation swelling process, using an impregnation swelling system, the impregnation swelling system comprising an impregnation tank, a conveyor belt arranged downstream of the impregnation tank, a support plate arranged downstream of the conveyor belt, and a toothed pressure roller arranged above the support plate;

[0010] The process includes a cellulose pulp impregnation process and a pulp porridge preparation process. The cellulose pulp impregnation process is to fully impregnate the pulp with a solvent solution without crushing the pulp, including a first impregnation stage, a second impregnation stage and a third impregnation stage, wherein:

[0011] The first stage of impregnation is to allow the pulp sheet to be immersed as a whole below the liquid surface of the solvent solution in the impregnation tank, including: conveying the pulp sheet flatly to the impregnation tank, wherein the pulp sheet is a roll pulp or a sheet pulp; the depth of the solvent solution in the impregnation tank is greater than the thickness of the pulp sheet, the pulp sheet is flatly entered into one end of the impregnation tank, the pulp sheet continues to move forward below the liquid surface of the solvent solution in the impregnation tank, and leaves the solvent solution from the other end of the impregnation tank;

[0012] The second stage of the impregnation is to increase the penetration of the solvent into the pulp sheet by squeezing the pulp sheet, including: the pulp sheet leaving the solvent solution is translated into a conveyor belt and transported along the conveyor belt; during the transportation process, the conveyed pulp sheet is squeezed at least three times, and the solvent is sprayed on the pulp sheet between two adjacent squeezing processes;

[0013] The third stage of impregnation is to adjust the ratio of solvent to fiber in the impregnated pulp sheet, including: the pulp sheet moves forward with the transmission belt to the support plate, and the pulp sheet is squeezed by the toothed pressure roller matched with the support plate to squeeze out the excess solvent in the pulp sheet, so that the mass ratio of solvent to fiber in the pulp sheet meets the process requirements;

[0014] The pulp porridge preparation process includes a primary crushing process, and the primary crushing process includes inputting the pulp board that meets the process requirements into a primary crusher, and crushing the pulp board into pulp porridge by the primary crusher. The process provided in this scheme includes a cellulose pulp board impregnation process and a pulp porridge preparation process. The pulp board uses an uncrushed pulp board, and the pulp board uses a roll pulp or a sheet pulp. In the cellulose pulp board impregnation process, a first impregnation stage is configured, and the uncrushed pulp board is immersed in the solvent liquid surface of the impregnation tank as a whole, and the pulp board is moved below the liquid surface of the solvent, so that the pulp board is indiscriminately in contact with the solvent, so that the pulp board can absorb the solvent more evenly and expand more evenly; then in the second impregnation stage, a part of the solvent in the impregnated pulp board is pressed out by squeezing the pulp board, and the penetration of the solvent in the pulp board is increased by pressing, and the contact dead angle between the pulp board and the solvent is prevented; and by pressing out the solvent in the impregnated pulp board, the ability of the pulp board to absorb the solvent again can be increased, and the solvent is sprayed on the pulp board after pressing, which can not only significantly increase the contact uniformity between the pulp board fiber and the solvent, making the impregnation more uniform, but also improve the solvent in the pulp board The mass ratio of the pulp to the fiber is such that the mass ratio is greater than the process requirement; then in the third stage of impregnation, the pulp board is squeezed by the cooperation of the toothed pressure roller and the support plate to squeeze out the excess solvent in the pulp board, so that the mass ratio of the solvent to the fiber in the pulp board is reduced, and finally the process requirement is met; finally, the pulp board that meets the process requirement is crushed into pulp porridge. Since the pulp board has been impregnated and swelled evenly at this time, the crushing process of this process will not cause pollution, the power required for crushing is smaller, and the crushing is more uniform, thereby effectively solving the drawbacks of the prior art of pre-crushing the dry pulp board; in addition, compared with the prior art, the present process can also ensure that the fiber and the solvent are fully and evenly contacted to expand, and the expansion is more uniform, and continuous feeding and continuous production can be achieved without batch differences of the intermittent swelling method, and energy consumption can be greatly reduced, making the production process of this process more energy-efficient. In addition, the present process can also ensure that the mass ratio of the fiber to the solvent in the pulp porridge meets the process requirements.

[0015] Preferably, in the first stage of dipping, the temperature of the solvent solution in the dipping tank is controlled to be 60-90°C.

[0016] Preferably, in the first stage of dipping, the concentration of the solvent solution in the dipping tank is 65% to 80%.

[0017] Preferably, in the pulp sheet obtained in the third stage of impregnation, the mass ratio of the solvent to the fiber is 6-8.

[0018] The second aspect of the present invention is to solve the problem that the pulp board can be more fully and evenly impregnated with the solvent solution without being crushed. Furthermore, a rotatable guide roller is arranged above the impregnation tank, and a needle for inserting the pulp board is arranged in the circumferential direction of the guide roller, and the pulp board passes through the bottom of the impregnation tank and the guide roller. By arranging a guide roller in the impregnation tank and arranging the needle for inserting the pulp board in the circumferential direction of the guide roller, the needle can be continuously inserted into the pulp board during the process of the pulp board passing through the bottom of the impregnation tank and the guide roller. On the one hand, the rotation of the guide roller can be used to provide the pulp board with power to move forward, and the moving speed of the pulp board can be accurately controlled by the guide roller to prevent the pulp board and the guide roller from sliding relative to each other, so that the residence time of the pulp board in the impregnation tank can be accurately controlled to obtain a more accurate and better impregnation effect. On the other hand, the needle can be inserted into the interior of the pulp board. When the needle exits the pulp board, a puncture hole will be formed on the pulp board. The external solvent solution can penetrate into the interior of the pulp board more dispersedly and evenly through the puncture hole, which can not only improve the impregnation efficiency, but also ensure that the pulp board can be more fully and evenly impregnated with the solvent solution without being crushed, which is conducive to achieving a better impregnation effect.

[0019] Furthermore, the first stage of impregnation also includes adjusting the installation height of the guide roller so that the gap between the guide roller and the impregnation tank is adapted to the thickness of the pulp sheet below the liquid surface. In this scheme, the installation height of the guide roller can be adjusted according to factors such as the thickness of the pulp sheet below the liquid surface, so that the installation height of the guide roller is adapted to the thickness of the pulp sheet after expansion, so as to reserve an adapted space between the guide roller and the impregnation tank, which can not only ensure that the expanded pulp sheet can move smoothly along the predetermined space without the problem of arching and clogging, but also effectively control the depth of the puncture hole, thereby achieving a more sufficient and uniform impregnation effect.

[0020] The third aspect of the present invention is to solve the problem of more sufficient and efficient impregnation of uncrushed pulp sheets with solvent solutions. Furthermore, a plurality of rotatable rollers are arranged above the bottom of the impregnation tank, the rollers and guide rollers are arranged alternately, the pulp sheets pass between the bottom of the impregnation tank and the rollers, and the rollers are used to squeeze the pulp sheets. In the present scheme, by configuring a rotating roller, the rotating roller can be used to restrain and squeeze the pulp board downward, and when the pulp board passes through the rotating roller, the penetration of the solvent in the pulp board can be increased by pressure; at the same time, part of the solvent in the pulp board can also be squeezed out in the solvent solution, so that the pulp board has a certain suction force, and after the pulp board passes through the rotating roller, the pulp board can reabsorb the solvent solution, which is beneficial to improve the impregnation efficiency and facilitate more complete impregnation, and it is not easy to have an impregnation dead corner; and through the coordination between the rotating roller and the guide roller, especially in the process of the pulp board reabsorbing the solvent solution, it just passes through the guide roller, and puncture holes that are uniform and deep into the interior of the pulp board can be formed on the pulp board after passing through the guide roller, which cooperates with the suction force during the expansion process of the pulp board, which is conducive to achieving a more uniform and efficient impregnation effect; when the pulp board with puncture holes moves to the next rotating roller, under the pressure of the rotating roller, the solvent can penetrate into the interior of the pulp board through the puncture holes, so that the impregnation of the uncrushed pulp board can be completed more fully, more evenly and more efficiently.

[0021] Furthermore, the first stage of impregnation also includes adjusting the installation height of the roller so that the gap between the roller and the impregnation tank reaches a set threshold. In this solution, the installation height of the roller can be adjusted according to factors such as the thickness of the pulp sheet and the required extrusion force so that the gap between the roller and the impregnation tank reaches the set threshold, which can not only reserve an adaptive space between the roller and the impregnation tank to ensure that the pulp sheet moves smoothly along the predetermined space, but also achieve the required extrusion force and extrusion effect, thereby facilitating a more sufficient and uniform impregnation effect.

[0022] Furthermore, before the pulp sheet enters the impregnation tank, the solvent is sprayed on the pulp sheet. The sprayed solvent is a fresh solvent, which is more conducive to the solvent penetrating into the dry and un-crushed pulp sheet, and is conducive to more complete and uniform impregnation.

[0023] The fourth aspect of the present invention is to solve the problem of accurately controlling the mass ratio of the solvent to the fiber in the pulp sheet. Furthermore, the third stage of impregnation also includes adjusting the distance between the toothed pressure roller and the support plate according to the process requirements, and controlling the mass ratio of the solvent to the fiber in the pulp sheet by controlling the distance. Not only can it meet the requirements of pulp sheets of different thicknesses and different processes, significantly improving the versatility of the process, but it can also accurately control the mass ratio of the solvent to the fiber in the pulp sheet to ensure that the mass ratio meets the process requirements.

[0024] In order to solve the problem of more accurately and stably controlling the mass ratio of solvent to fiber in the pulp sheet, a plurality of toothed rollers are further arranged along the moving direction of the pulp sheet, and multi-stage extrusion of the pulp sheet is achieved through the plurality of toothed rollers. Through multi-stage extrusion, on the one hand, part of the solvent can be squeezed out step by step, thereby gradually increasing the mass ratio of solvent to fiber in the pulp sheet, making it easier to control the mass ratio of solvent to fiber in the pulp sheet to the process requirements, and it is not easy to have the problem of too much pressure, resulting in a mass ratio lower than the process requirements, which can effectively improve the accuracy and reliability of this process; on the other hand, the pulp sheet can be pressed more evenly and dispersedly, ensuring a more even distribution of the solvent inside the pulp sheet, and preventing the situation where the local solvent content is very high or very low, which can further ensure the quality and effect of the impregnation and swelling.

[0025] The fifth aspect of the present invention aims to solve the problem of preventing the occurrence of unimpregnated fibers in the pulp plate. Furthermore, the pulp porridge preparation process also includes a pulping process and a secondary crushing process, wherein the pulping process includes inputting the pulp porridge into an extrusion device for extrusion, controlling the extrusion force, and using the extrusion device to squeeze the loose pulp porridge into block pulp porridge;

[0026] The secondary crushing process includes inputting the block pulp into a secondary crusher, and crushing the block pulp by the secondary crusher. In this scheme, by configuring the pulping process and the secondary crushing process, the pulping process can be used to extrude the crushed pulp porridge, so that the crushed loose pulp porridge can be formed into a block pulp porridge after a certain degree of extrusion. Through this process, the fiber and the solvent can be mixed more evenly, and the existence of unimpregnated fibers can be avoided. At the same time, it is necessary to control the extrusion force to ensure that the solvent does not flow out of the block pulp porridge, so that the mass ratio of the solvent to the fiber in the pulp porridge meets the process requirements. The block pulp porridge can be crushed again by the secondary crushing process, which is also conducive to promoting a more uniform mixing of the fiber and the solvent; and through the coordinated cooperation of the primary crushing process, the pulping process and the secondary crushing process, the fiber and the solvent in the porridge can be mixed more evenly, and the existence of the white core can be effectively eliminated, thereby improving the quality of the porridge.

[0027] Preferably, the sprayed solvent is an NMMO aqueous solution, the concentration of the NMMO aqueous solution is 65% to 80%, and the temperature of the NMMO aqueous solution is 60 to 90°C.

[0028] The sixth aspect of the present invention aims to solve the problems existing in the existing impregnation and swelling, and provides an impregnation and swelling system for fibers, comprising a first impregnation unit, a second impregnation unit, a regulating unit and a slurry unit, wherein:

[0029] The first impregnation unit comprises an impregnation tank for containing a solvent solution, and a guide roller rotatably arranged in the impregnation tank, wherein a needle for inserting a pulp board is arranged in a circumferential direction of the guide roller, and the pulp board passes between the impregnation tank and the guide roller, and the guide roller is used to drive the pulp board to move forward under the liquid surface of the solvent solution;

[0030] The second impregnation unit comprises a conveying mechanism arranged downstream of the impregnation tank, at least three extrusion assemblies and a plurality of spraying mechanisms, the conveying mechanism is used to receive the upstream pulp board and drive the pulp board to be transported forward, the extrusion assemblies are arranged at intervals along the conveying direction of the conveying mechanism, the extrusion assemblies are used to extrude part of the solvent in the pulp board, and the spraying mechanism is arranged between at least two adjacent extrusion assemblies, and the spraying mechanism is used to spray the solvent onto the pulp board;

[0031] The regulating unit comprises a support plate arranged downstream of the conveying mechanism and a toothed pressing roller arranged above the support plate, the support plate is used to support the pulp sheet, the pulp sheet passes between the toothed pressing roller and the support plate, and the toothed pressing roller is used to squeeze out excess solvent in the pulp sheet so that the mass ratio of solvent to fiber in the pulp sheet meets the process requirements;

[0032] The pulp porridge unit comprises a primary crusher arranged downstream of the support plate, and the primary crusher is used to crush the pulp plate into pulp porridge. The system can not only meet the above process requirements, but also effectively solve the above technical problems existing in the prior art.

[0033] Furthermore, the guide roller is arranged above the dipping tank in a liftable manner, so that the gap between the guide roller and the dipping tank is adjustable.

[0034] Furthermore, the first impregnation unit further comprises a plurality of rollers, which are rotatably mounted above the impregnation tank, the rollers are alternately arranged with guide rollers, the pulp sheet passes through the bottom of the impregnation tank and between the rollers, and the rollers are used to squeeze the pulp sheet, so as to use the rollers to restrain the pulp sheet downward, ensure that the pulp sheet moves below the liquid surface in the impregnation tank, and enable the pulp sheet to fully absorb the solvent and expand in the impregnation tank.

[0035] Furthermore, the rotating roller is arranged above the dipping tank in a liftable manner, so that the gap between the rotating roller and the dipping tank is adjustable.

[0036] The seventh aspect of the present invention is to solve the problem of coordinated cooperation between the conveying process and the extrusion process. Preferably, the conveying mechanism includes an active roller, a driven roller and a conveyor belt tensioned on the active roller and the driven roller; the extrusion assembly includes a pressure roller and an idler roller, the idler roller is arranged on the inner side of the conveyor belt, the pressure roller is arranged above the conveying mechanism, and the corresponding idler rollers realize the extrusion of the pulp plate through the cooperation of the pressure roller and the idler roller.

[0037] Furthermore, the conveyor belt is a stainless steel mesh belt, which can stably and steadily support the pulp plate and facilitate the smooth recovery of the squeezed solvent.

[0038] In order to solve the problem of facilitating the recovery of excess solvent, preferably, the support plate is a stainless steel plate with holes, so as to ensure that the extruded solvent can smoothly flow out through the holes and be discharged into the collection tank below.

[0039] Furthermore, the regulating unit further comprises a collecting tank, the conveying mechanism and / or the supporting plate are arranged above the collecting tank, and the collecting tank is used to collect the solvent.

[0040] Furthermore, the toothed pressure roller is arranged above the support plate in a liftable manner, so that the gap between the toothed pressure roller and the support plate is adjustable.

[0041] Furthermore, it also includes an extrusion device and a secondary crusher. The extrusion device is connected to the output end of the primary crusher and is used to extrude the porridge and form block-shaped porridge. The secondary crusher is connected to the extrusion device and is used to crush the block-shaped porridge.

[0042] Compared with the prior art, the present invention provides a fiber impregnation and swelling process and system, which adopts the process of first impregnating an uncrushed pulp board with a solvent, and then crushing the fully impregnated and swollen pulp board to form a pulp porridge. This process can not only avoid the disadvantages of dust pollution, uneven crushing, and power consumption caused by crushing the dry pulp board, but also ensure that the pulp board absorbs the solvent uniformly and expands uniformly, realizes continuous feeding and continuous production, and ensures that the mass ratio of fiber to solvent in the pulp porridge meets the process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 The present invention is a schematic structural diagram of a pulp board impregnated and swollen by using an impregnation and swelling system provided by the present invention.

[0045] Figure 2 The present invention is a schematic structural diagram of a method for manufacturing porridge using an impregnation swelling system provided by the present invention.

[0046] Figure 3 In an impregnation swelling system provided in Example 2 of the present invention, both ends of the toothed pressure roller are respectively installed on a front view of a lifting mechanism.

[0047] Figure 4 In an impregnation swelling system provided in Example 2 of the present invention, both ends of the toothed pressure roller are respectively installed at Figure 3Side view of the lifting mechanism shown.

[0048] Figure 5 In an impregnation swelling system provided in Example 2 of the present invention, both ends of the toothed pressure roller are respectively installed on a front view of another lifting mechanism.

[0049] Figure 6 In an impregnation swelling system provided in Example 2 of the present invention, both ends of the toothed pressure roller are respectively installed at Figure 5 Front view of the lifting mechanism shown.

[0050] Figure 7 In an impregnation swelling system provided in Example 3 of the present invention, both ends of a guide roller are respectively installed on a front view of a lifting mechanism.

[0051] Figure 8 In an impregnation swelling system provided in Example 3 of the present invention, both ends of the guide roller are respectively installed at Figure 7 Front view of the lifting mechanism shown.

[0052] Fig. 9 In an impregnation swelling system provided in Example 4 of the present invention, both ends of a pressure roller are respectively installed on a front view of a lifting mechanism.

[0053] Fig.10 In an impregnation swelling system provided in Example 4 of the present invention, both ends of the pressing roller are respectively installed at Fig. 9 Front view of the lifting mechanism shown.

[0054] Fig.11 In an impregnation swelling system provided in Example 5 of the present invention, both ends of a rotating roller are respectively installed on a front view of a lifting mechanism.

[0055] Explanation of the marks in the figure: first impregnation unit 1, impregnation tank 11, guide roller 12, needling 13, rotating roller 13; second impregnation unit 2, active roller 21, driven roller 22, conveyor belt 23, extrusion assembly 24, pressure roller 25, support roller 26; adjustment unit 3, support plate 31, toothed pressure roller 32, toothed protrusion 33; porridge unit 4, primary crusher 41, extrusion equipment 42, secondary crusher 43, screw conveyor 44; frame 5, spray mechanism 51, collecting tank 52, bearing 53; lifting mechanism 6, lifting seat 60, mounting hole 601, hanging hole 602, lifting power 61, coupling 62, screw 63, block 631, threaded hole 64, guide rail 65, slider 66, guide hole 67, guide rod 68, movable frame 69; pulp plate 7. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0057] Example 1

[0058] This embodiment provides a fiber impregnation and swelling system, comprising a first impregnation unit 1, a second impregnation unit 2, a regulating unit 3 and a slurry unit 4, wherein:

[0059] like Figure 1 As shown, the first impregnation unit 1 includes an impregnation tank 11 for containing a solvent solution, a guide roller 12 and a rotating roller 14, wherein the impregnation tank 11 can adopt an existing tank body, as long as it can contain the solvent solution. As an example, in the preferred implementation provided in the embodiment, the impregnation tank 11 is surrounded by a front part, a rear part, a bottom part and two end parts, the front part and the rear part are arranged opposite to each other, the two end parts are arranged opposite to each other and are respectively connected to the front part and the rear part, and the lower ends of the front part, the rear part and the two end parts are respectively connected to the bottom part so as to form a container together, as shown in FIG. Figure 1 In practice, the two ends of the immersion tank 11 can be respectively constructed as a slope structure, such as Figure 1 As shown, not only can the pulp sheet 7 be guided to move along the bottom of the immersion tank 11, but the pulp sheet will not encounter obstacles and arch, and there will be no problems of pulp sheet accumulation and clogging. During implementation, the inclination angle of the sloped structure can be determined according to actual needs. For example, in this embodiment, the inclination angle of the sloped structure is less than 15°, so that the turning point between the end and the bottom is smoothly transitioned, so as to facilitate the expansion of the pulp sheet to move along the bottom of the immersion tank 11 without encountering obstacles and arching. For example, in this embodiment, the solvent solution is NMMO solution.

[0060] In this embodiment, the guide roller 12 can be rotatably mounted above the dipping tank 11 through the bearing 53. Figure 1 As shown, the guide roller 12 has the freedom to rotate relative to the immersion tank 11. Figure 1As shown, the guide roller 12 is constructed as a cylindrical structure, and the circumferential direction of the guide roller 12 is provided with a needle 13 for inserting the pulp board, and there is a suitable gap between the guide roller 12 and the impregnation tank 11. When in use, the pulp board 7 can pass through the impregnation tank 11 and the guide roller 12, and the needle 13 on the guide roller 12 can be continuously inserted into the pulp board. On the one hand, the guide roller 12 can not only drive the pulp board to move forward under the liquid surface of the solvent solution through the needle 13, but also prevent the pulp board and the guide roller 12 from sliding relative to each other, so that the residence time of the pulp board in the impregnation tank 11 can be accurately controlled to obtain a more accurate and better impregnation effect. On the other hand, the needle 13 can be inserted into the interior of the pulp board. When the needle 13 exits the pulp board, a puncture hole will be formed on the pulp board. The external solvent solution can penetrate into the interior of the pulp board more dispersedly and evenly through the puncture hole, which can not only improve the impregnation efficiency, but also ensure that the pulp board can be more fully and evenly impregnated with the solvent solution without being crushed, which is conducive to achieving a better impregnation effect. In addition, by driving the pulp sheet forward through the guide roller 12, the effect of continuous feeding and continuous operation can be achieved, which can significantly improve efficiency. In implementation, the guide roller 12 includes a roller and a needle 13 disposed on the surface of the roller. The end of the needle 13 away from the roller is configured as a pointed structure. As shown in the figure, each needle 13 can be evenly distributed along the surface of the roller so as to be more evenly inserted into the pulp sheet.

[0061] like Figure 1 As shown, in this embodiment, the roller 14 can also be rotatably mounted above the immersion tank 11 through the bearing 53, so that the roller 14 has the freedom to rotate relative to the immersion tank 11. As an example, Figure 1 As shown, the roller 14 is also constructed as a cylindrical structure, which is beneficial to reducing the moment of inertia. There is also a gap between the roller 14 and the immersion tank 11, such as Figure 1 As shown, when in use, the pulp sheet 7 can pass through the impregnation tank 11 and the roller 14, and the roller 14 can constrain and squeeze the pulp sheet downward. When the pulp sheet passes through the roller 14, the pressure of the roller 14 can increase the penetration of the solvent in the pulp sheet; at the same time, part of the solvent in the pulp sheet can be squeezed out in the solvent solution, so that the pulp sheet has a certain suction force. After the pulp sheet passes through the roller 14, the pulp sheet can reabsorb the solvent solution, which is beneficial to improve the impregnation efficiency and facilitate more complete impregnation, and it is not easy to have an impregnation dead corner; in addition, by the roller 1 The pulp sheet 4 is matched with the guide roller 12, especially in the process of reabsorbing the solvent solution, it just passes through the guide roller 12, and even puncture holes that penetrate into the pulp sheet can be formed on the pulp sheet after passing through the guide roller 12, which cooperates with the suction force in the process of the pulp sheet expansion, which is conducive to achieving a more uniform and efficient impregnation effect; when the pulp sheet with puncture holes moves to the next rotating roller 14, under the pressure of the rotating roller 14, the solvent can penetrate into the interior of the pulp sheet through the puncture holes, so that the impregnation of the un-crushed pulp sheet can be completed more fully, more evenly and more efficiently.

[0062] During implementation, the number of guide rollers 12 can be determined according to actual needs. Similarly, the number of rotating rollers 14 and the relative position relationship between the rotating rollers 14 and the guide rollers 12 can also be determined according to actual needs. For example, in a preferred embodiment, a plurality of rotating rollers 14 are further arranged above the immersion tank 11, and the rotating rollers 14 and the guide rollers 12 are arranged alternately, such as Figure 1 As shown, the pulp sheet passes between the impregnation tank 11 and the roller 14, and the roller 14 is used to squeeze the pulp sheet 7. As an example, Figure 1 As shown, a guide roller 12 is provided at the middle position of the immersion tank 11, so that the pulp sheet can fit the bottom of the immersion tank 11 and continue to move forward under the liquid surface. At the same time, guide rollers 12 are also provided at both ends of the immersion tank 11, so that the pulp sheet can better fit the two ends of the immersion tank 11. As shown in the figure, during implementation, a rotating roller 14 is also provided between two adjacent guide rollers 12, so that the rotating roller 14 can be used in conjunction with the guide roller 12, which is conducive to more fully, evenly and efficiently completing the immersion of the uncrushed pulp sheet.

[0063] like Figure 1 As shown in the figure, in a more perfect solution, one or more rollers 14 are further arranged upstream of the upstream guide roller 12 to limit and restrain the dry pulp sheet so that the dry pulp sheet can be flatly transported and smoothly flatly transported into the impregnation tank 11, as shown in the figure. Correspondingly, one or more rollers 14 are further arranged downstream of the downstream guide roller 12, as shown in the figure. Figure 1 As shown, it is ensured that the pulp sheet can be smoothly and stably laid flat and fed into the downstream conveying mechanism.

[0064] In implementation, the first impregnation unit 1 further includes a first power, which is connected to the guide roller 12 for driving the guide roller 12 to rotate. The first power can preferably be a servo motor or a stepper motor. The first power can be connected to the guide roller 12 through a first transmission mechanism such as a gear transmission mechanism, a belt transmission mechanism, or a chain transmission mechanism. In implementation, the impregnation tank 11 can be set on the frame 5, and the guide roller 12 can be connected to the frame 5 through a bearing 53, and can also be connected to the impregnation tank 11 through a bearing 53. For example, Figure 1 As shown, the guide roller 12 can be connected to the frame 5 through the bearing 53, and the guide roller 12 is located above the immersion tank 11. The immersion tank 11 is constructed in a flat shape, so that the guide roller 12 can drive the pulp plate 7 in the immersion tank 11 to move forward, and does not need to pass through the front and rear of the immersion tank 11, and there is no need to consider the sealing problem, which is conducive to simplifying the structure and reducing costs.

[0065] In implementation, the roller 14 in the first impregnation unit 1 can be connected to the impregnation tank 11 and / or the frame 5 through the bearing 53. In one embodiment, the roller 14 may not be equipped with power, and the roller 14 rotates freely driven by the pulp board. In another embodiment, the first impregnation unit 1 also includes a second power, which can be connected to the roller 14 through a second transmission mechanism such as a gear transmission mechanism, a belt transmission mechanism, or a chain transmission mechanism, so as to drive the roller 14 to rotate, so that the roller 14 can be used to drive the pulp board to move forward.

[0066] In this embodiment, the second impregnation unit 2 includes a conveying mechanism disposed downstream of the impregnation tank 11, at least three extrusion assemblies 24, and a plurality of spraying mechanisms 51, such as Figure 1 As shown, the conveying mechanism is mainly used to receive the upstream pulp board and drive the pulp board to continue to be conveyed forward. In implementation, the conveying mechanism may include an active roller 21, a driven roller 22, and a conveyor belt 23 stretched between the active roller 21 and the driven roller 22, as shown in FIG. Figure 1 As shown, the conveyor belt 23 can preferably be a stainless steel mesh belt, which can stably and steadily support the pulp plate and allow the squeezed solvent to fall smoothly so as to smoothly recover the solvent. Therefore, in a more perfect solution, the second impregnation unit 2 also includes a collecting tank 52, such as Figure 1 As shown, the conveying mechanism can be arranged above the collecting tank 52 so as to use the collecting tank 52 to receive the falling solvent, thereby achieving the purpose of collecting the solvent. In implementation, the conveying mechanism also includes a third power, which is connected to the driving roller 21 to drive the conveyor belt 23 to rotate cyclically; in implementation, the third power can preferably be a servo motor or a stepper motor.

[0067] like Figure 1 As shown, in the embodiment, the extrusion assemblies 24 are arranged at intervals along the conveying direction of the conveying mechanism, and the extrusion assemblies 24 are used to extrude part of the solvent in the pulp sheet, and a spraying mechanism 51 is provided between at least two adjacent extrusion assemblies 24, and the spraying mechanism 51 is used to spray the solvent onto the pulp sheet 7. In implementation, the extrusion assembly 24 includes a pressing roller 25 and a supporting roller 26, as shown in FIG. Figure 1As shown, the roller 26 is arranged on the inner side of the conveyor belt 23, and the pressure roller 25 is arranged above the conveying mechanism and corresponds to the roller 26. Specifically, the roller 26 can be connected to the frame 5 through the bearing 53. Similarly, the pressure roller 25 can also be connected to the frame 5 through the bearing 53. There is a preset gap between the roller 26 and the pressure roller 25, and the pulp sheet passes through between the pressure roller 25 and the roller 26. The pulp sheet is squeezed by the cooperation of the pressure roller 25 and the roller 26. It can be understood that during implementation, the pressure roller 25 in the squeezing assembly 24 may not be equipped with power, but in a preferred embodiment, the second impregnation unit 2 also includes a fourth power, which is transmission-connected to the pressure roller 25 in the squeezing assembly 24 and is used to drive the pressure roller 25 to rotate. During implementation, the number of squeezing assemblies 24 can be determined according to actual needs. For example, Figure 1 As shown, the second impregnation unit 2 is equipped with three extrusion assemblies 24, and a spray mechanism 51 is provided between two adjacent extrusion assemblies 24. Figure 1 As shown, in this embodiment, the spray mechanism 51 uses a spray pipe, and a nozzle is configured on the side of the spray pipe. Each spray pipe is connected to a delivery pump through a pipeline, and the delivery pump is connected to a container for storing solvents, and the container is equipped with a filter. The delivery pump delivers the filtered solvent to the spray pipe through a pipeline, and the solvent goes out from the nozzle of the spray pipe to achieve the purpose of spraying the pulp sheet. When in use, through the cooperation of the extrusion component 24 and the spray mechanism 51, the pulp sheet soaked in the solvent is pressed out of part of the solvent by the pressing roller 25, and then absorbs the solvent sprayed thereon. This method is used multiple times to make the solvent and fiber impregnation more uniform and the swelling more complete.

[0068] In a further embodiment, a spray mechanism 51 is also arranged upstream of the guide roller 12 in the first impregnation unit 1. Figure 1 As shown, the spray mechanism 51 is also connected to the conveyor through a pipeline. The spray mechanism 51 is used to spray the solvent onto the pulp board before the pulp board enters the impregnation tank 11. The sprayed solvent is a fresh solvent, which is more conducive to the penetration of the solvent into the dry and uncrushed pulp board, and is conducive to more complete and uniform impregnation.

[0069] In this embodiment, the adjusting unit 3 includes a support plate 31 disposed downstream of the conveying mechanism and a toothed pressure roller 32 disposed above the support plate 31. Figure 1As shown, the support plate 31 is used to support the pulp plate, and the pulp plate passes between the toothed pressure roller 32 and the support plate 31. The toothed pressure roller 32 is used to squeeze out the excess solvent in the pulp plate 7 so that the mass ratio of the solvent to the fiber in the pulp plate meets the process requirements. In implementation, the support plate 31 can preferably adopt a stainless steel plate with holes to ensure that the squeezed solvent can flow out smoothly through the holes and be discharged into the collection tank 52 below. Therefore, in a more perfect embodiment, a collection tank 52 is also configured below the support plate 31, and the collection tank 52 is used to collect the solvent. In implementation, a collection tank 52 can be configured for the conveying mechanism and the regulating unit 3 respectively, or the conveying mechanism and the regulating unit 3 can share a collection tank 52.

[0070] In this embodiment, the toothed roller 32 includes a roller and a plurality of toothed protrusions 33 arranged in the circumferential direction of the roller. The toothed protrusions 33 can be evenly arranged, and the side of the toothed protrusions 33 away from the center of the toothed roller 32 is a blunt head structure, such as Figure 1 As shown, the contact area between the toothed protrusion 33 and the pulp plate is larger, so as to achieve the purpose of squeezing the pulp plate. In implementation, the toothed pressing roller 32 can be connected to the frame 5 and / or the support plate 31 through the bearing 53, so that the toothed pressing roller 32 has the freedom to rotate relative to the support plate 31. At the same time, the adjustment unit 3 also includes a fifth power, which can preferably be a servo motor or a stepper motor. The fifth power can be connected to the toothed pressing roller 32 through a coupling 62 or a gear transmission mechanism or a belt transmission mechanism or a chain transmission mechanism, so as to drive the toothed pressing roller 32 to rotate.

[0071] In implementation, the number of toothed pressure rollers 32 can be determined according to actual needs. Preferably, a plurality of toothed pressure rollers 32 are arranged along the moving direction of the pulp plate 7. Figure 1 As shown, the multi-stage extrusion of the pulp sheet is achieved by multiple toothed pressure rollers 32. Through multi-stage extrusion, on the one hand, part of the solvent can be squeezed out step by step, so as to gradually increase the mass ratio of the solvent to the fiber in the pulp sheet, making it easier to control the mass ratio of the solvent to the fiber in the pulp sheet to the process requirements, and it is not easy to have the problem of too much pressure causing the mass ratio to be lower than the process requirements, which can effectively improve the accuracy and reliability of this process; on the other hand, the pulp sheet can be pressed more evenly and dispersedly, ensuring that the distribution of the solvent inside the pulp sheet is more even, and there will be no situation where the local solvent content is very high and the local solvent content is very low, which can further ensure the quality and effect of the impregnation and swelling.

[0072] like Figure 1 and Figure 2 As shown, in this embodiment, the porridge unit 4 includes a primary crusher 41, an extruder 42 and a secondary crusher 43 arranged downstream of the support plate 31, wherein Figure 1 and Figure 2As shown, the support plate 31 is connected to the inlet of the primary crusher 41, and the primary crusher 41 is mainly used to crush the pulp plate into pulp porridge; Figure 1 and Figure 2 As shown, the extrusion device 42 is connected to the output end of the primary crusher 41, and is used to squeeze the porridge and form a block of porridge. During implementation, the extrusion device 42 ensures that the crushed loose porridge is subjected to a certain degree of extrusion, and the degree of extrusion is such that the porridge is formed into blocks but the solvent does not flow out. Therefore, in this embodiment, the extrusion device 42 preferably adopts a variable pitch screw extruder, such as Figure 1 and Figure 2 The secondary crusher 43 is connected to the extrusion device 42 and is used to crush the block porridge. Figure 1 and Figure 2 As shown, during implementation, a toothed pulverizing roller or a comb-pin type pulverizing roller may be preferentially configured in the primary pulverizer 41 ; correspondingly, a toothed pulverizing roller or a comb-pin type pulverizing roller may also be preferentially configured in the secondary pulverizer 43 .

[0073] In a more complete solution, the porridge unit 4 further includes a screw conveyor 44 connected to the secondary crusher 43, such as Figure 2 As shown, the screw conveyor 44 is used to smoothly feed the slurry into the downstream thin film evaporator.

[0074] In order to achieve a better impregnation effect, in a more complete embodiment, a controller is also included. A first temperature sensor and a first heater are provided in the impregnation tank 11. The first heater can preferably be an electric heater. The first temperature sensor and the first heater are respectively connected to the controller to ensure that the temperature of the solvent solution in the impregnation tank 11 can be accurately controlled, so that the temperature of the solvent solution in the impregnation tank 11 is more in line with the process requirements, thereby achieving a better impregnation effect.

[0075] In a more perfect embodiment, a second temperature sensor and a second heater are provided in the collecting tank 52, and the second heater can preferably be an electric heater. The second temperature sensor and the second heater are respectively connected to the controller to accurately control the temperature of the solvent in the collecting tank 52. In implementation, the delivery pump can be connected to the collecting tank 52, so as to use the collecting tank 52 to provide solvent to the spray mechanism 51, thereby facilitating a better impregnation effect. During normal production, the configured solvent can be continuously added to the impregnation tank 11.

[0076] Based on the impregnation and swelling system provided in this embodiment, this embodiment also provides an impregnation and swelling process based on the impregnation and swelling system, including a cellulose pulp impregnation process and a pulp porridge preparation process. The cellulose pulp impregnation process is to fully impregnate the pulp with a solvent solution without crushing the pulp, including a first impregnation stage, a second impregnation stage and a third impregnation stage, wherein:

[0077] The first stage of impregnation is to immerse the pulp sheet 7 as a whole below the liquid surface of the solvent solution in the impregnation tank 11, so that the pulp sheet is in contact with the solvent without distinction, and a better impregnation swelling effect is achieved. In practice, the first stage of impregnation specifically includes: conveying the pulp sheet flatly to the impregnation tank 11, wherein the pulp sheet is made of rolled pulp or sheet pulp; the impregnation tank 11 is filled with solvent solution, the depth of the solvent solution in the impregnation tank 11 is greater than the thickness of the pulp sheet, the pulp sheet 7 is flatly placed into one end of the impregnation tank 11, so that the pulp sheet continues to move forward below the liquid surface of the solvent solution in the impregnation tank 11, and leaves the solvent solution from the other end of the impregnation tank 11, such as Figure 1 or Figure 2 shown.

[0078] The second stage of impregnation is to squeeze out part of the solvent in the pulp sheet by extrusion, increase the penetration of the solvent in the pulp sheet by pressure, and avoid the existence of dead corners where the pulp sheet is not in contact with the solvent; then the spraying mechanism 51 is combined to replenish the solvent for the pulp sheet, and the solvent and the fiber are impregnated more evenly and swell more fully through multiple combinations of extrusion and spraying. In practice, the second stage of impregnation specifically includes: the pulp sheet 7 leaving the solvent solution is translated into a conveyor belt and transported along the conveyor belt, such as Figure 1 or Figure 2 As shown; during the conveying process, the conveyed pulp sheet is squeezed at least three times by the squeezing assembly 24, and the solvent is sprayed onto the pulp sheet by the spraying mechanism 51 between two adjacent squeezing processes.

[0079] Through the first and second impregnation stages, not only can the pulp sheet be impregnated more evenly and swollen more fully, but also the content of solvent in the pulp sheet can be higher, so that the mass ratio of solvent to fiber is greater than the process requirement.

[0080] The third stage of impregnation is to adjust the ratio of solvent to fiber in the impregnated pulp sheet, so that the ratio of solvent to fiber in the pulp sheet is reduced to meet the process requirements. In implementation, the third stage of impregnation specifically includes: the pulp sheet 7 moves forward with the transmission belt to the support plate 31, and the pulp sheet is squeezed by the toothed pressure roller 32 matched with the support plate 31 to squeeze out the excess solvent in the pulp sheet, so that the mass ratio of solvent to fiber in the pulp sheet meets the process requirements, such as Figure 1 or Figure 2 In implementation, the mass ratio of the solvent to the fiber in the pulp sheet can be determined according to actual needs. In the preferred implementation provided in this embodiment, the mass ratio of the solvent to the fiber in the pulp sheet can be preferably 6 to 8, which is conducive to the subsequent acquisition of lyocell fibers with better performance.

[0081] like Figure 1 or Figure 2As shown, the pulp porridge preparation process includes a primary crushing process, a pulping process and a secondary crushing process, wherein the primary crushing process includes inputting the pulp plate 7 that meets the process requirements into the primary crusher 41, and using the primary crusher 41 to crush the pulp plate into pulp porridge. The pulping process includes inputting the pulp porridge into the extrusion device 42 for extrusion, controlling the extrusion force, and using the extrusion device 42 to squeeze the loose pulp porridge into block pulp porridge; through this process, it is possible to promote a more uniform mixing of the fiber and the solvent, and avoid the existence of unimpregnated fibers. At the same time, it is necessary to control the extrusion force to achieve moderate extrusion of the pulp porridge, ensure that the solvent does not flow out of the block pulp porridge, and make the mass ratio of the solvent to the fiber in the pulp porridge meet the process requirements. The secondary crushing process includes inputting the block pulp porridge into the secondary crusher 43, using the secondary crusher 43 to crush the block pulp porridge, and can be input into the downstream thin film evaporator through the screw conveyor 44 for evaporation and dissolution. In this process, the secondary crushing process is used to crush the lumpy pulp porridge again, which is also beneficial to promote a more uniform mixing of the fiber and the solvent; and through the coordinated cooperation of the primary crushing process, the pulping process and the secondary crushing process, the fiber and the solvent in the porridge can be mixed more fully and evenly, and the presence of the white core can be effectively eliminated, thereby improving the quality of the porridge.

[0082] The use of this process to prepare pulp porridge has at least the following advantages: First, the process of first impregnating the pulp plate and then crushing it avoids the disadvantages of dust pollution, uneven crushing, and huge power consumption caused by crushing the dry pulp plate. Second, in this process, the pulp plate is immersed in the solvent indiscriminately to ensure that the pulp plate absorbs the solvent evenly and expands evenly. Third, this process uses a pressure roller 25 to press the impregnated and expanded pulp plate to promote full contact between the solvent and the fiber, and the production control is simple and reliable. Fourth, this process can be continuously fed and produced without batch differences of intermittent swelling methods. Fifth, this process avoids the high-energy-consuming process in the existing Lyocell production process, which requires stirring high-viscosity pulp porridge in the reactor container to achieve full mixing and swelling of the fiber and the solvent, and is more energy-efficient than the existing production method. Sixth, this process can also achieve automatic control of the entire process, which reduces the use of labor compared to the existing Lyocell production swelling process and greatly reduces costs.

[0083] In a more preferred embodiment, in the first stage of dipping, the concentration of the solvent solution in the dipping tank 11 can be controlled to be 65% to 80%. Meanwhile, in the first stage of dipping, the temperature of the solvent solution in the dipping tank 11 can be controlled to be 60 to 90°C.

[0084] In a more preferred embodiment, the spraying solvent is NMMO aqueous solution, the concentration of the NMMO aqueous solution is 65% to 80%, and the temperature of the NMMO aqueous solution is controlled to be 60 to 90°C, which is beneficial for achieving better impregnation and swelling effect and for subsequently obtaining better quality lyocell fibers.

[0085] Example 2

[0086] The main difference between the present embodiment 2 and the above-mentioned embodiment 1 is that in the impregnation and swelling system provided in the present embodiment, the toothed pressure roller 32 is arranged above the support plate 31 in a liftable manner. Figure 3-Figure 6 As shown, the gap between the toothed pressure roller 32 and the support plate 31 can be adjusted according to actual needs, which can not only meet the needs of pulp boards of different thicknesses and different processes, significantly improve the versatility of the impregnation swelling system and process, but also can accurately control the mass ratio of the solvent to the fiber in the pulp board to ensure that the mass ratio meets the process requirements.

[0087] In implementation, the support plate 31 can be fixedly arranged on the frame 5, and the frame 5 is used to support the support plate 31. The support plate 31 can be arranged horizontally, such as Figure 1-Figure 2 In order to arrange the toothed pressure roller 32 to be liftable above the support plate 31, during implementation, the adjustment unit 3 further includes a lifting mechanism 6, such as Figure 3-Figure 6 As shown, the lifting mechanism 6 includes a lifting seat 60, a lifting power 61, and a guide structure, wherein the guide structure includes a guide part and a sliding part that are adapted to each other, the guide part is arranged in the vertical direction, and is directly or indirectly arranged on the frame 5, the sliding part is movably constrained to the guide part, the lifting seat 60 is connected to the sliding part to prevent the lifting seat 60 from rotating relative to the sliding part; the lifting power 61 is transmission-connected with the lifting seat 60 to drive the lifting seat 60 to lift vertically. During implementation, the lifting mechanism 6 is respectively provided at both ends of the toothed pressure roller 32, and the two ends of the toothed pressure roller 32 are respectively connected to the lifting seat 60, so that the lifting power 61 can be used to drive the lifting seat 60 to lift vertically, and the vertical lifting of the lifting seat 60 can be used to drive the toothed pressure roller 32 to lift vertically, so as to achieve the purpose of adjusting the gap between the toothed pressure roller 32 and the support plate 31.

[0088] In one embodiment, the lifting power 61 can be a motor. In this case, the lifting mechanism 6 also includes a screw 63. Figure 3 and Figure 4 As shown, the lifting seat 60 is provided with a threaded hole 64 adapted to the screw 63, the lifting seat 60 is threadedly connected to the screw 63, the screw 63 is arranged vertically, and one end of the screw 63 is connected to the motor transmission, for example, the screw 63 can be connected to the motor transmission through a coupling 62, when in use, the motor drives the screw 63 to rotate, and due to the cooperation of the guide part and the sliding part, the lifting seat 60 can be vertically lifted and lowered under the drive of the screw 63. In implementation, the guide structure has a variety of implementation methods, for example, when the guide part adopts a guide rail 65, the sliding part is a slider 66 adapted to the guide rail 65, at this time, the motor can be fixedly installed on the frame 5, such as Figure 3 and Figure 4As shown. For another example, when the guide portion adopts a guide hole 67 constructed on the frame 5, the sliding portion can be a guide rod 68 adapted to the guide hole 67, and the guide rod 68 vertically passes through the guide hole 67. The guide function is achieved through the cooperation between the guide rod 68 and the guide hole 67. In addition, when the guide portion adopts a guide groove constructed on the frame 5, the sliding portion can be a guide block adapted to the guide groove. The guide function is achieved through the cooperation between the guide groove and the guide block.

[0089] In another embodiment, if Figure 5 and Figure 6 As shown, the lifting power 61 adopts a motor, the lifting mechanism 6 also includes a screw 63, the frame 5 is configured with a threaded hole 64 adapted to the screw 63, the screw 63 is vertically arranged and threadedly connected with the threaded hole 64, the lifting seat 60 is provided with a hanging hole 602, the diameter of the hanging hole 602 is larger than the diameter of the screw 63, the lower end of the screw 63 passes through the hanging hole 602, the screw 63 can rotate relative to the hanging hole 602, and the lower end of the screw 63 is provided with a stopper 631 for limiting, as shown in FIG. Figure 5 and Figure 6 As shown, the upper end of the screw rod 63 is connected to the motor through the coupling 62. The guide part adopts a guide hole 67 constructed on the frame 5, and correspondingly, the sliding part adopts a guide rod 68 adapted to the guide hole 67. Figure 5 and Figure 6 As shown, the upper ends of the guide rods 68 are respectively fixed to the movable frames 69, and the lower ends of the guide rods 68 can be connected to the lifting seat 60. The motor is fixedly installed on the movable frame 69. When in use, the motor drives the screw 63 to rotate, thereby driving the lifting seat 60, the screw 63, the guide rod 68 and the motor to vertically lift and lower together.

[0090] To facilitate assembly, during implementation, the lifting seat 60 is also provided with a mounting hole 601. Figure 3 or Figure 5 As shown, during assembly, the toothed roller 32 can be connected to the mounting hole 601 through the bearing 53, so that the installation of the toothed roller 32 can be easily completed. During implementation, the lifting seat 60 can also be a bearing seat.

[0091] In addition, in another embodiment, the lifting power 61 can also be a cylinder, which is connected to the lifting seat 60 in a transmission manner, so that the cylinder can be used to drive the lifting seat 60 to vertically lift. At this time, in a more perfect embodiment, a travel switch is also configured, and the controller is connected to the travel switch and the lifting power 61, so that the height of the lifting seat 60 can be controlled by the cooperation of the travel switch and the lifting power 61, thereby achieving the purpose of adjusting the gap between the toothed pressure roller 32 and the support plate 31.

[0092] In practice, when the toothed roller 32 is equipped with an independent fifth power, the fifth power can be installed on the lifting seat 60 of the lifting mechanism 6, so that the fifth power can be lifted and lowered synchronously with the lifting seat 60 and the toothed roller 32, ensuring stable transmission of the fifth power and the toothed roller 32. When the power of the toothed roller 32 is configured inside it (for example, when the roller of the toothed roller 32 is an electric roller), the toothed roller 32 can be connected to the lifting seat 60 through the bearing 53.

[0093] Based on the impregnation and swelling system, in the impregnation and swelling process, the third stage of impregnation also includes adjusting the distance between the toothed pressure roller 32 and the support plate 31 according to the process requirements, so as to control the mass ratio of the solvent to the fiber in the pulp sheet by controlling the distance. Not only can it meet the needs of pulp sheets of different thicknesses and different processes, significantly improving the versatility of this process, but it can also accurately control the mass ratio of the solvent to the fiber in the pulp sheet to ensure that the mass ratio meets the process requirements. In the case of multiple toothed pressure rollers 32, along the conveying direction of the pulp sheet, the distance between each toothed pressure roller 32 and the support plate 31 can be gradually reduced to achieve multi-stage extrusion, which can not only effectively improve the accuracy and reliability of this process, but also further improve the quality and effect of impregnation and swelling.

[0094] Example 3

[0095] The main difference between this embodiment 3 and the above embodiments is that in the impregnation and swelling system provided in this embodiment, the guide roller 12 is arranged above the impregnation tank 11 in a liftable manner, so that the gap between the guide roller 12 and the impregnation tank 11 is adjustable. Figure 7 and Figure 8 As shown, the installation height of the guide roller 12 can be adjusted according to factors such as the thickness of the pulp sheet below the liquid surface, so that the installation height of the guide roller 12 is adapted to the thickness of the pulp sheet after expansion, so as to reserve an adaptive space between the guide roller 12 and the impregnation tank 11. This can not only ensure that the expanded pulp sheet can move smoothly along the predetermined space without problems such as arching and clogging, but also effectively control the depth of the puncture hole, thereby achieving a more sufficient and uniform impregnation effect.

[0096] During implementation, the first impregnation unit 1 is further provided with the lifting mechanism 6 for the guide roller 12, such as Figure 7 and Figure 8 As shown, the guide roller 12 can be lifted and lowered by the lifting mechanism 6 to adjust the gap between the guide roller 12 and the immersion tank 11. In practice, the lifting mechanism 6 is provided at both ends of the guide roller 12. Figure 7 and Figure 8As shown, both ends of the guide roller 12 are respectively connected to the lifting seat 60 in the lifting mechanism 6, so that the lifting power 61 can be used to drive the lifting seat 60 to vertically lift and lower, and the vertical lifting of the lifting seat 60 can be used to drive the guide roller 12 to vertically lift and lower, so as to adjust the gap size between the guide roller 12 and the impregnation tank 11.

[0097] In practice, the lifting mechanism 6 can be implemented with the above structure, which will not be described in detail here. The guide roller 12 can be connected to the mounting hole 601 of the lifting seat 60 through the bearing 53 .

[0098] In practice, when the guide roller 12 is equipped with an independent first power, the first power can be installed on the lifting seat 60 of the lifting mechanism 6, so that the first power can be lifted and lowered synchronously with the lifting seat 60 and the guide roller 12, ensuring stable transmission of the first power and the guide roller 12. When the power of the guide roller 12 is configured inside it (for example, when the roller of the guide roller 12 is an electric roller), the guide roller 12 can be connected to the lifting seat 60 through the bearing 53.

[0099] Based on the impregnation swelling system, in the impregnation swelling process, the first stage of impregnation also includes adjusting the installation height of the guide roller 12 according to the process requirements, so that the gap between the guide roller 12 and the impregnation tank 11 is adapted to the thickness of the pulp sheet below the liquid surface. On the one hand, it can ensure that the expanded pulp sheet can move smoothly along the predetermined space without problems such as arching and clogging. On the other hand, it can effectively control the depth of the puncture hole, thereby achieving a more sufficient and uniform impregnation effect. In addition, it can also ensure that the guide roller 12 stably drives the pulp sheet to move forward to ensure continuous production.

[0100] Example 4

[0101] In order to further promote the problem of sufficient contact between the solvent and the fiber, the main difference between the present embodiment 4 and the above embodiments is that in the impregnation swelling system provided in the present embodiment, the pressing roller 25 in the extrusion assembly 24 can be raised and lowered above the conveying mechanism, so that the distance between the pressing roller 25 and the supporting roller 26 is adjustable, such as Fig. 9 and Fig.10 As shown, on the one hand, the squeezing force of the squeezing assembly 24 on the pulp sheet can be effectively adjusted to meet the requirements of impregnation and swelling in different occasions. On the other hand, the pressing roller 25 can more accurately press the impregnated and expanded pulp sheet, increase the penetration effect of the solvent in the pulp sheet, further promote the solvent to fully contact the fiber, avoid the existence of unimpregnated fiber (white core), and the production control is simple and reliable.

[0102] In implementation, the second impregnation unit 2 is further provided with the lifting mechanism 6 for the pressing roller 25 in the extrusion assembly 24, so that the pressing roller 25 can be lifted and lowered by the lifting mechanism 6, thereby achieving the purpose of adjusting the gap between the pressing roller 25 and the conveying mechanism. In implementation, the lifting mechanisms 6 are respectively provided at both ends of the pressing roller 25. Fig. 9 and Fig.10 As shown, both ends of the pressure roller 25 are respectively connected to the lifting seat 60 in the lifting mechanism 6, so that the lifting power 61 can be used to drive the lifting seat 60 to vertically lift and lower, and the vertical lifting of the lifting seat 60 can be used to drive the pressure roller 25 to vertically lift and lower, thereby effectively adjusting the distance between the pressure roller 25 and the conveying mechanism.

[0103] In practice, the lifting mechanism 6 can be realized by the above structure, which will not be described in detail here. The pressure roller 25 can be connected to the mounting hole 601 of the lifting seat 60 through the bearing 53.

[0104] In practice, when the extrusion assembly 24 in the second impregnation unit 2 is equipped with an independent fourth power, the fourth power can be installed on the lifting seat 60 of the lifting mechanism 6, so that the fourth power can be lifted and lowered synchronously with the lifting seat 60 and the pressure roller 25, ensuring stable transmission of the fourth power and the pressure roller 25. When the power of the pressure roller 25 is configured inside it (for example, when the roller of the pressure roller 25 is an electric roller), the pressure roller 25 can be connected to the lifting seat 60 through the bearing 53.

[0105] Based on the impregnation and swelling system, in the impregnation and swelling process, the second stage of impregnation also includes adjusting the height of the pressure roller 25 in the extrusion assembly 24 so that the distance between the pressure roller 25 and the conveyor belt 23 in the conveying mechanism reaches a set threshold value, so as to achieve the required extrusion force and extrusion effect, which is conducive to more complete contact between the solvent and the fiber.

[0106] Example 5

[0107] The main difference between this embodiment 5 and the above embodiments is that in the impregnation and swelling system provided in this embodiment, the rotating roller 14 in the first impregnation unit 1 is arranged above the impregnation tank 11 in a manner such that the rotating roller 14 can be raised and lowered. Fig.11 As shown, the distance between the rotating roller 14 and the impregnation tank 11 is adjustable, which can reserve an adaptive space between the rotating roller 14 and the impregnation tank 11 to ensure that the pulp plate moves smoothly along the predetermined space, and can achieve the required extrusion force and extrusion effect, thereby facilitating a more sufficient and uniform impregnation effect.

[0108] During implementation, the first impregnation unit 1 is further provided with the lifting mechanism 6 for the rotating roller 14. Fig.11 As shown, the roller 14 can be lifted and lowered by the lifting mechanism 6 to adjust the distance between the roller 14 and the immersion tank 11. In practice, the lifting mechanism 6 is provided at both ends of the roller 14. Fig.11As shown, both ends of the roller 14 are respectively connected to the lifting seat 60 in the lifting mechanism 6, so that the lifting power 61 can be used to drive the lifting seat 60 to vertically lift and lower, and the vertical lifting of the lifting seat 60 can be used to drive the roller 14 to vertically lift and lower, thereby effectively adjusting the distance between the roller 14 and the immersion tank 11.

[0109] In practice, the lifting mechanism 6 can be implemented by the above structure, which will not be described in detail here. The roller 14 can be connected to the mounting hole 601 of the lifting seat 60 through the bearing 53.

[0110] In practice, when the roller 14 in the first impregnation unit 1 is equipped with an independent second power, the second power can be installed on the lifting seat 60 of the lifting mechanism 6, so that the second power can be lifted and lowered synchronously with the lifting seat 60 and the roller 14, ensuring stable transmission of the second power and the roller 14. When the power of the roller 14 is configured inside it (for example, when the roller of the roller 14 is an electric roller), the roller 14 can be connected to the lifting seat 60 through the bearing 53.

[0111] Based on the impregnation and swelling system, in the impregnation and swelling process, the first stage of impregnation also includes adjusting the installation height of the roller 14 so that the distance between the roller 14 and the impregnation tank 11 reaches a set threshold value, so that the installation height of the roller 14 can be adjusted according to factors such as the thickness of the pulp board and the required extrusion force, so that the distance between the roller 14 and the impregnation tank 11 reaches a set threshold value, which can reserve an adaptive space between the roller 14 and the impregnation tank 11 to ensure that the pulp board moves smoothly along the predetermined space, and can achieve the required extrusion force and extrusion effect, thereby facilitating a more sufficient and uniform impregnation effect.

[0112] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A process for impregnation and swelling of fibers, characterized in that: An impregnation and swelling system is used, which includes an impregnation tank, a conveyor belt arranged downstream of the impregnation tank, a support plate arranged downstream of the conveyor belt, and a toothed pressure roller arranged above the support plate; the process includes a cellulose pulp impregnation process and a pulp porridge preparation process, and the cellulose pulp impregnation process is to fully impregnate the pulp with a solvent solution without crushing the pulp, including a first impregnation stage, a second impregnation stage, and a third impregnation stage, wherein: The first stage of impregnation is to allow the pulp sheet to be immersed as a whole below the liquid surface of the solvent solution in the impregnation tank, including: conveying the pulp sheet flatly to the impregnation tank, wherein the pulp sheet is a roll pulp or a sheet pulp; the depth of the solvent solution in the impregnation tank is greater than the thickness of the pulp sheet, the pulp sheet is flatly entered into one end of the impregnation tank, the pulp sheet continues to move forward below the liquid surface of the solvent solution in the impregnation tank, and leaves the solvent solution from the other end of the impregnation tank; The second stage of the impregnation is to increase the penetration of the solvent into the pulp sheet by squeezing the pulp sheet, including: the pulp sheet leaving the solvent solution is translated into a conveyor belt and transported along the conveyor belt; during the transportation process, the conveyed pulp sheet is squeezed at least three times, and the solvent is sprayed on the pulp sheet between two adjacent squeezing processes; The third stage of impregnation is to adjust the ratio of solvent to fiber in the impregnated pulp sheet, including: the pulp sheet moves forward with the transmission belt to the support plate, and the pulp sheet is squeezed by the toothed pressure roller matched with the support plate to squeeze out the excess solvent in the pulp sheet, so that the mass ratio of solvent to fiber in the pulp sheet meets the process requirements; The pulp porridge preparation process includes a primary crushing process, which includes inputting the pulp plate that meets the process requirements into a primary crusher, and crushing the pulp plate into pulp porridge by the primary crusher.

2. The impregnation and swelling process for fibers according to claim 1, characterized in that: A rotatable guide roller is arranged above the impregnation tank, and needles for inserting a pulp board are arranged in the circumferential direction of the guide roller. The pulp board passes between the bottom of the impregnation tank and the guide roller.

3. The impregnation swelling process for fibers according to claim 2, characterized in that: The first stage of dipping also includes adjusting the installation height of the guide roller so that the gap between the guide roller and the dipping tank is adapted to the thickness of the pulp sheet below the liquid surface.

4. The impregnation and swelling process for fibers according to claim 1, characterized in that: A plurality of rotatable rollers are also arranged above the impregnation tank. The rollers and guide rollers are arranged alternately. The pulp sheet passes between the impregnation tank and the rollers. The rollers are used to squeeze the pulp sheet.

5. The impregnation and swelling process for fibers according to claim 1, characterized in that: The third stage of impregnation also includes adjusting the distance between the toothed pressure roller and the support plate according to the process requirements, and controlling the mass ratio of the solvent to the fiber in the pulp plate by controlling the distance.

6. The impregnation and swelling process for fibers according to claim 5, characterized in that: A plurality of toothed pressing rollers are arranged along the moving direction of the pulp plate, and multi-stage extrusion of the pulp plate is achieved through the plurality of toothed pressing rollers.

7. The impregnation and swelling process for fibers according to claim 1, characterized in that: The porridge preparation process also includes a slurry squeezing process and a secondary crushing process, wherein: The slurry squeezing process includes inputting the slurry porridge into an extrusion device for extrusion, controlling the extrusion force, and using the extrusion device to squeeze the loose slurry porridge into block slurry porridge; The secondary crushing process includes inputting the block porridge into a secondary crusher, and crushing the block porridge by the secondary crusher.

8. The impregnation and swelling process for fibers according to claim 1, characterized in that: In the first stage of dipping, the temperature of the solvent solution in the dipping tank is controlled to be 60-90°C; In the first stage of dipping, the concentration of the solvent solution in the dipping tank is 65% to 80%; In the pulp sheet obtained in the third stage of impregnation, the mass ratio of solvent to fiber is 6-8.

9. A fiber impregnation and swelling system, characterized in that: It includes a first impregnation unit, a second impregnation unit, a regulating unit and a porridge unit, wherein: The first impregnation unit comprises an impregnation tank for containing a solvent solution, and a guide roller rotatably arranged in the impregnation tank, wherein a needle for inserting a pulp board is arranged in a circumferential direction of the guide roller, and the pulp board passes between the impregnation tank and the guide roller, and the guide roller is used to drive the pulp board to move forward under the liquid surface of the solvent solution; The second impregnation unit comprises a conveying mechanism arranged downstream of the impregnation tank, at least three extrusion assemblies and a plurality of spraying mechanisms, the conveying mechanism is used to receive the upstream pulp board and drive the pulp board to be transported forward, the extrusion assemblies are arranged at intervals along the conveying direction of the conveying mechanism, the extrusion assemblies are used to extrude part of the solvent in the pulp board, and the spraying mechanism is arranged between at least two adjacent extrusion assemblies, and the spraying mechanism is used to spray the solvent onto the pulp board; The regulating unit comprises a support plate arranged downstream of the conveying mechanism and a toothed pressing roller arranged above the support plate, the support plate is used to support the pulp sheet, the pulp sheet passes between the toothed pressing roller and the support plate, and the toothed pressing roller is used to squeeze out excess solvent in the pulp sheet so that the mass ratio of solvent to fiber in the pulp sheet meets the process requirements; The pulp porridge unit comprises a primary crusher arranged downstream of the supporting plate, and the primary crusher is used for crushing the pulp plate into pulp porridge.

10. The impregnation and swelling system for fibers according to claim 9, characterized in that: The guide roller is arranged in the dipping tank in a liftable manner, so that the gap between the guide roller and the dipping tank is adjustable; The toothed pressure roller is arranged above the support plate in a liftable manner, so that the gap between the toothed pressure roller and the support plate is adjustable; It also includes an extrusion device and a secondary crusher. The extrusion device is connected to the output end of the primary crusher and is used to extrude the porridge to form block-shaped porridge. The secondary crusher is connected to the extrusion device and is used to crush the block-shaped porridge.

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