Regenerated cellulose fiber wet spinning device

Abstract

The utility model discloses a regenerated cellulose fiber wet spinning device, belongs to the field of fiber preparation, and aims to ensure the quality of fibers. Comprising a spinning kettle, a metering pump, a spinneret plate, a coagulating bath tank, a washing system, an oiling box, a drying system and a filament collecting system, the spinning kettle comprises a liquid outlet, a gas inlet used for introducing nitrogen and a gas outlet used for being connected with a vacuumizing pump, a filter plate is arranged in a kettle cavity, the kettle cavity is divided into an upper cavity on the upper portion and a lower cavity on the lower portion through the filter plate, the gas inlet and the gas outlet are communicated with the upper cavity, and the liquid outlet is communicated with the lower cavity. Through the arrangement of the air outlet connected into the vacuum pump, bubbles in a spinning solution are removed in a vacuum state, the problem that bubbles exist in the solution conveyed to the spinneret plate is solved, fibers sprayed by the spinneret plate are full and free of holes, and the quality and performance of cellulose fibers are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of fiber preparation, in particular to a regenerated cellulose fiber wet spinning device. Background Art

[0002] Wet spinning is an important process for chemical fiber forming, which mainly includes spinning solution filtration, degassing, solution delivery to metering pump, coagulation molding, washing, oiling, drying and collecting. Regenerated cellulose fiber has many advantages such as abundant resources, natural environmental protection, good moisture absorption and air permeability, excellent dyeing and color fixation performance, etc., so it is widely used in clothing, construction, high-end packaging and smart wear and other fields, which has led to the rapid development of regenerated cellulose fiber in recent years. The preparation of regenerated cellulose fiber is also usually carried out by wet spinning. The wet spinning of quaternary ammonium alkali / water system is one of the regenerated cellulose fiber wet spinning methods currently used. The solvent for dissolving the raw cellulose pulp is a mixed solvent of TBAH organic alkali solvent and DMSO dissolving aid, such as a new preparation process of regenerated cellulose fiber disclosed in the utility model patent application with application number CN202010296921.2.

[0003] At present, the equipment for preparing regenerated cellulose fibers usually adopts a spinning machine, which includes a stock solution barrel, a metering pump, a connecting elbow, a spinneret, a coagulation bath, a drafting device and a winding device. After the raw material is dissolved in the dissolving kettle, it is quantitatively input into the connecting elbow through a metering pump, and then ejected from the connecting elbow through the spinneret to coagulate into filaments in the coagulation bath, and then drawn by the drafting device and wound up. In order to accelerate the dissolution, a stirring device such as a stirrer is set in the dissolving kettle.

[0004] However, after the raw cellulose pulp is dissolved in a mixed solvent of TBAH organic alkali solvent and DMSO dissolving aid, impurities and bubbles exist in the solution. If it is directly transported to the spinneret for spinning, problems such as fiber breakage are likely to occur, affecting the quality and performance of the regenerated cellulose fiber. Utility Model Content

[0005] The utility model aims to provide a simple and efficient regenerated cellulose fiber wet spinning device to ensure the quality of the fiber yarns.

[0006] The technical solution adopted by the utility model is: a regenerated cellulose fiber wet spinning device, including a spinning kettle, a metering pump, a spinneret, a coagulation bath, a washing system, an oiling box, a drying system and a fiber collection system;

[0007] The spinning kettle comprises a liquid outlet, an air inlet for introducing nitrogen and an air outlet for connecting a vacuum pump. A filter plate is arranged in the kettle cavity, and the kettle cavity is divided into an upper cavity and a lower cavity through the filter plate. The air inlet and the air outlet are connected to the upper cavity, and the liquid outlet is connected to the lower cavity.

[0008] The liquid outlet, metering pump, spinneret, oiling box and coagulation bath of the spinning kettle are connected in sequence. The stock solution is sprayed into the coagulation bath from the spinneret and coagulated into fiber filaments in the coagulation bath. The fiber filaments are stretched by the stretching system, washed in the water washing system and dried by the drying system. The dried fiber filaments are rolled by the collecting system.

[0009] Furthermore, a heat-insulating jacket is provided between the metering pump and the spinneret.

[0010] Furthermore, the water washing system includes a three-stage water washing tank, a two-stage water washing tank and a one-stage water washing tank which are vertically distributed from bottom to top;

[0011] The fiber filaments coagulated by the stock solution in the coagulation bath are drawn into the tertiary washing tank, drawn out from the tertiary washing tank and enter the secondary washing tank, and drawn out from the secondary washing tank and enter the primary washing tank.

[0012] Furthermore, a stretching group one is arranged between the entrance of the tertiary water washing tank and the exit of the coagulation bath tank; a stretching group two is arranged between the exit of the tertiary water washing tank and the entrance of the secondary water washing tank; a stretching group three is arranged between the exit of the secondary water washing tank and the entrance of the secondary water washing tank and between the oiling box; and a stretching group four is arranged between the drying system and the wire collecting system.

[0013] Furthermore, the stretching group 1, stretching group 2, stretching group 3 and stretching group 4 each include three rollers of the same specifications, and the three rollers are distributed in an inverted triangle; the stretching group 1, stretching group 2, stretching group 3 and stretching group 4 have their own variable frequency speed regulating motors to adjust the roller speeds.

[0014] Furthermore, the drying system includes a first heating roller group and a second heating roller group.

[0015] Furthermore, the heating roller group 1 and the heating roller group 2 both include an upper roller and a lower roller located below the upper roller; the inclination of the lower roller is 15°.

[0016] Furthermore, the wire collection system includes a wire guide roller and a winding roller; the wire guide roller is located at the entrance of the winding roller.

[0017] The beneficial effects of the utility model are as follows: the utility model provides a regenerated cellulose fiber wet spinning device, which realizes the systematic and complete process operation of degassing, filtering, coagulation regeneration molding, and stretching, washing, oiling, drying and winding of the regenerated cellulose spinning solution, and can continuously and stably prepare regenerated cellulose fibers.

[0018] By connecting the air outlet of the vacuum pump, the bubbles in the spinning solution can be removed under vacuum, eliminating the problem of bubbles in the solution delivered to the spinneret, making the fibers ejected from the spinneret full and without holes, ensuring the quality and performance of the cellulose fibers. By setting the air inlet for nitrogen, nitrogen can be introduced into the spinning kettle for pressurization, which accelerates the speed of solution filtration and helps improve production efficiency. At the same time, it also reduces the solution retained in impurities and improves the utilization rate of the solution. The spinning kettle integrates filtration and degassing, which helps to reduce the overall size of the spinning device and save space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the utility model structure.

[0020] In the figure, there are a spinning kettle 1, an air inlet 1001, an air outlet 1002, a filter plate 13, a metering pump 2, a heat-insulating jacket 3, a spinneret 4, a coagulation bath 5, a drawing system 6, a drawing group 1 61, a drawing group 2 62, a drawing group 3 63, a drawing group 4 64, a water washing system 7, a tertiary water washing tank 73, a secondary water washing tank 72, a primary water washing tank 71, an oiling box 8, a drying system 9, a heating roller group 1 91, a heating roller group 2 92, a wire collection system 10, a guide roller 101, a winding roller 102, and a control system 11. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0022] Regenerated cellulose fiber wet spinning device, such as Figure 1 As shown, it includes a spinning kettle 1, a metering pump 2, a spinneret 4, a coagulation bath 5, a water washing system 7, an oiling box 8, a drying system 9 and a wire collection system 10;

[0023] The spinning kettle 1 includes a liquid outlet, an air inlet 1001 for introducing nitrogen, and an air outlet 1002 for connecting a vacuum pump. A filter plate 13 is arranged in the kettle cavity, and the kettle cavity is divided into an upper cavity at the top and a lower cavity at the bottom through the filter plate 13. The air inlet 1001 and the air outlet 1002 are connected to the upper cavity, and the liquid outlet is connected to the lower cavity. When in use, a mixed solution of cellulose pulp and a mixed solvent for dissolving fiber pulp is a spinning solution. The spinning solution is added into the upper cavity of the spinning kettle 1 from the kettle cover, and the kettle cover is covered; then, the air inlet 1001 is closed, and the air outlet 1002 is connected to the vacuum pump to remove bubbles in the spinning solution under vacuum. By removing bubbles, the problem of bubbles in the solution transported to the spinneret 4 is eliminated, so that the fiber filaments ejected from the spinneret 4 are full and have no holes. After the bubbles are removed, the air outlet 1002 is closed, the air inlet 1001 is opened, and nitrogen is introduced into the spinning kettle 1 through the air inlet 1001 for pressurization. The spinning stock solution is filtered through the filter plate 13. The nitrogen pressurization accelerates the speed of stock solution filtration, which is beneficial to improving production efficiency, while also reducing the stock solution retained in impurities and improving the stock solution utilization rate. The spinning kettle 1 integrates filtration and degassing, avoids the independent settings of filtration and degassing, is beneficial to reducing the overall size of the spinning device, saves space, and also shortens the distance of the stock solution flow path.

[0024] The spinning kettle 1 is made of 316 stainless steel and plated with polytetrafluoroethylene; the spinning kettle 1 is equipped with an electric heating temperature control effect, and the temperature can reach up to 100°C; the two steps of degassing and filtering can be completed in the kettle, avoiding the operations of filtering using a filtering kettle and degassing using a degassing kettle respectively, thereby improving the operating efficiency.

[0025] The liquid outlet, metering pump 2, spinneret 4 and coagulation bath 5 of the spinning kettle 1 are connected in sequence. The raw liquid is sprayed into the coagulation bath 5 from the spinneret 4 and coagulated into fiber filaments in the coagulation bath 5. The fiber filaments are stretched by the stretching system, washed in the washing system 7, and dried by the drying system 9. The dried fiber filaments are rolled by the collecting system 10.

[0026] The metering pump is used to control the flow rate of the spinning solution, and is located below the spinning kettle 1 and connected to the liquid outlet of the spinning kettle 1 by a pipeline. The metering pump has a maximum flow rate of 1.2cc / rmp, a motor power of 370W, and a reduction ratio of the reduction box of 1:59.

[0027] Since the fiber filaments coming out of the coagulation bath 5 will have residual solvents, such as a mixed solvent of TBAH organic alkali solvent and DMSO dissolving aid, the residual solvents need to be removed, and the washing system 7 uses water washing to remove the residual solvents on the fiber filaments to avoid the residual solvents from affecting the fiber filaments. The washing system 7 includes a three-stage washing tank 73, a secondary washing tank 72 and a primary washing tank 71 vertically distributed from bottom to top; the fiber filaments coagulated by the stock solution in the coagulation bath 5 are drawn into the three-stage washing tank 73, drawn out from the three-stage washing tank 73 and enter the secondary washing tank 72, and drawn out from the secondary washing tank 72 and enter the primary washing tank 71. The fiber washing process is from low to high.

[0028] The three-stage washing tank 73, the two-stage washing tank 72 and the one-stage washing tank 71 are used for three washings, which effectively removes the solvent on the fiber. Moreover, the three-stage washing tank 73, the two-stage washing tank 72 and the one-stage washing tank 71 are arranged vertically, which saves the floor space. During washing, the fiber goes from the three-stage washing tank 73 at the bottom to the one-stage washing tank 71 at the top, that is, the fiber is washed from the bottom to the top, which ensures that the washed fiber will not be contaminated by the washing liquid flowing down along the fiber.

[0029] The washed fiber filaments are oiled when passing through the oiling box 8 to increase the cohesion of the fibers. The oiled fiber filaments need to be dried before being rolled up, and the drying system plays the role of drying the fiber filaments. The drying system is located in the front side of the oiling box 8, that is, the fiber filaments first pass through the oiling box 8 and then move to the drying system. The drying system includes a heating roller group 1 91 and a heating roller group 2 92. The fiber filaments that have been oiled by the oiling box 8 enter the heating roller group 1 91 and the heating roller group 2 92 in turn under the action of the drafting device. A group of heating rollers consists of an upper roller and a lower roller, and the lower roller is located directly below the upper roller. Each upper roller and lower roller can be individually temperature-controlled, and the heating method is electric heating temperature control, with a temperature range of 0-160°C; the outer dimensions of each upper roller and lower roller are 150mm in diameter; the material of the upper roller and lower roller is 316 stainless steel, and the roller speed is controlled by a variable frequency speed regulating motor, with a speed range of 0-100mm / min; due to the addition of a lower roller in each heating roller group, the fiber can be wound multiple times in the heating roller group, thereby increasing the contact area between the fiber and the heating roller and improving the drying efficiency of the fiber.

[0030] The wire collection system 10 includes a wire guide roller 101 and a winding roller 102 ; the wire guide roller 101 is located at the entrance of the winding roller 102 .

[0031] The insulation jacket 3 is located between the metering pump 2 and the spinneret 4, and its function is to keep the spinning solution warm during the transmission process. The insulation effect is determined by the set temperature of the external constant temperature bath, and the insulation range is 0-100°C. The design of the insulation jacket 3 maintains a constant temperature of the spinning solution during the transportation process between the metering pump 2 and the spinneret 4, effectively avoiding the problem of excessive viscosity of the spinning solution caused by too low temperature, and effectively ensuring the continuity and stability of the spinning process.

[0032] The coagulation bath 5 is made of 316 stainless steel and is plated with polytetrafluoroethylene on the inside; the heating / cooling method is a bottom coil, and the internal temperature of the coil is determined by the set temperature of an external constant temperature bath, and the temperature range is -15-100°C.

[0033] The drafting system includes four drafting groups; each drafting group consists of three rollers, each roller has a diameter of 80mm, and is made of 316 stainless steel. The roller speed is controlled by a variable frequency speed regulating motor, and the speed range is 0-100mm / min; each drafting group can adjust the speed individually, which can establish a more comprehensive relationship between the fiber preparation process and performance. The distribution of these four drafting groups is as follows: a drafting group 1 61 is arranged between the entrance of the tertiary water washing tank 73 and the exit of the coagulation bath tank 5; a drafting group 2 62 is arranged between the exit of the tertiary water washing tank 73 and the entrance of the secondary water washing tank 72; a drafting group 2 62 is arranged between the exit of the secondary water washing tank 72 and the entrance of the secondary water washing tank 72, and a drafting group 3 63 is arranged between the oiling box 8; a drafting group 4 64 is arranged between the drying system 9 and the wire collection system 10.

[0034] It also includes a control system 11, which is connected to the spinning kettle 1 to control the temperature of the spinning kettle 1; the control system 11 is connected to the metering pump, and the metering pump feeds back the flow rate, so that the control system 11 controls the output flow rate of the stock solution; the control system 11 is also connected to the coagulation bath to control the temperature of the coagulation bath; the control system 1 also controls the drying temperature and the drawing speed, etc. The control system can efficiently establish the relationship between the fiber preparation process conditions, structure and performance, and continuously and stably prepare regenerated cellulose fibers.

[0035] It should be noted that the attached Figure 1 The red lines represent fiber filaments.

[0036] When the above-mentioned regenerated cellulose fiber wet spinning device is used for spinning, first, the air inlet 1001 of the spinning kettle 1 is closed, and the air outlet 1002 is connected to a vacuum pump to remove bubbles in the spinning solution under a vacuum state; after the bubbles are removed, the air outlet 1002 is closed, and the air inlet 1001 is opened, and nitrogen is introduced into the spinning kettle 1 from the air inlet 1001 for pressurization, and the spinning solution is filtered through the filter plate 13; the filtered spinning solution is extruded through the spinneret of the spinneret 4 under the metering of the metering pump 2 into the coagulation bath 5 to form regenerated cellulose fibers; the fibers are drawn into the primary washing tank 71, the secondary washing tank 72 and the tertiary washing tank 73 in turn for washing; then they enter the oiling box to oil the fibers; the oiled fibers continue to be drawn and enter the drying system 9 in turn; finally, the fibers are wound on the winding roller 102 through the traction of the guide roller 101.

Claims

1. A regenerated cellulose fiber wet spinning device, characterized in that: It comprises a spinning kettle (1), a metering pump (2), a spinneret (4), a coagulation bath (5), a water washing system (7), an oiling box (8), a drying system (9) and a wire collection system (10); The spinning kettle (1) comprises a liquid outlet, an air inlet (1001) for introducing nitrogen, and an air outlet (1002) for connecting to a vacuum pump; a filter plate (13) is arranged in the kettle cavity, and the kettle cavity is divided into an upper cavity body at the top and a lower cavity body at the bottom via the filter plate (13); the air inlet (1001) and the air outlet (1002) are connected to the upper cavity body, and the liquid outlet is connected to the lower cavity body; The liquid outlet, metering pump (2), spinneret (4), oiling box (8) and coagulation bath (5) of the spinning kettle (1) are connected in sequence. The stock liquid is sprayed from the spinneret (4) into the coagulation bath (5) and coagulated into fiber filaments in the coagulation bath (5). The fiber filaments are drawn by a drawing system, washed in a water washing system (7), and dried by a drying system (9). The dried fiber filaments are rolled into a roll by a collection system (10).

2. The regenerated cellulose fiber wet spinning device according to claim 1, characterized in that: A heat-insulating jacket (3) is provided between the metering pump (2) and the spinneret (4).

3. The regenerated cellulose fiber wet spinning device according to claim 1, characterized in that: The water washing system (7) comprises a third-stage water washing tank (73), a second-stage water washing tank (72) and a first-stage water washing tank (71) which are arranged in sequence from bottom to top in the vertical direction; The fiber filaments coagulated by the stock solution in the coagulation bath (5) are drawn into the tertiary water washing tank (73), drawn out from the tertiary water washing tank (73) and enter the secondary water washing tank (72), and then drawn out from the secondary water washing tank (72) and enter the primary water washing tank (71).

4. The regenerated cellulose fiber wet spinning device according to claim 3, characterized in that: A stretching group one (61) is arranged between the entrance of the tertiary water washing tank (73) and the exit of the coagulation bath tank (5); a stretching group two (62) is arranged between the exit of the tertiary water washing tank (73) and the entrance of the secondary water washing tank (72); a stretching group two (62) is arranged between the exit of the secondary water washing tank (72) and the entrance of the secondary water washing tank (72) and a stretching group three (63) is arranged between the oiling box (8); and a stretching group four (64) is arranged between the drying system (9) and the wire collecting system (10).

5. The regenerated cellulose fiber wet spinning device according to claim 4, characterized in that: The stretching group one (61), the stretching group two (62), the stretching group three (63) and the stretching group four (64) all include three rollers of the same specifications, and the three rollers are arranged in an inverted triangle; the speed of the rollers of the stretching group one (61), the stretching group two (62), the stretching group three (63) and the stretching group four (64) are adjusted by independent variable frequency speed regulating motors.

6. The regenerated cellulose fiber wet spinning device according to claim 1, characterized in that: The drying system (9) comprises a first heating roller group (91) and a second heating roller group (92).

7. The regenerated cellulose fiber wet spinning device according to claim 6, characterized in that: The heating roller group 1 (91) and the heating roller group 2 (92) both include an upper roller and a lower roller located below the upper roller; the inclination of the lower roller is 15°.

8. The regenerated cellulose fiber wet spinning device according to claim 1, characterized in that: The wire collection system (10) comprises a wire guide roller (101) and a winding roller (102); the wire guide roller (101) is located at the entrance of the winding roller (102).

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