Water-soluble vinylon filament production process and production line

Abstract

The invention relates to the technical field of vinylon fiber wet spinning, and discloses a water-soluble vinylon filament production process and production line, the water-soluble vinylon filament production process comprises a spinning heat treatment process and a post-treatment process, the spinning heat treatment process is adopted to produce semi-finished endless tows, and the post-treatment process comprises the following steps: S1, washing: alternately changing the width of the tows in the washing process, kneading the tows; s2, applying oil; s3, drying is conducted, specifically, the tows are dried in stages through a plurality of drying machines, the drying machines are arranged at intervals, and the drying temperature of each drying machine is gradually increased in the running direction of the tows; and S4, cooling: cooling the dried tows on a cooling machine, and packaging the cooled tows into bags. The technical problem that water-soluble vinylon filaments manufactured through an existing vinylon filament production line and an existing vinylon filament production process are not prone to being snapped or broken in a strand mode when stretch-breaking yarn is spun can be solved through the water-soluble vinylon filament production line and the water-soluble vinylon filament production process.

Description

Technical Field

[0001] The invention relates to the technical field of wet spinning of vinylon fibers, and in particular to a production process and a production line for water-soluble vinylon filaments. Background Art

[0002] Vinylon, also known as vinylon, is a synthetic fiber made from polyvinyl alcohol as raw material and water as solvent by wet spinning. It has a wide range of uses. According to its appearance and use, it is divided into water-soluble vinylon filament, water-soluble vinylon staple fiber, formaldehyded vinylon filament and formaldehyded vinylon staple fiber. Among them, water-soluble vinylon filament is mainly used to make water-soluble vinylon stretched chopped yarn.

[0003] At present, the main process of manufacturing water-soluble vinylon filaments is: squeeze the polyvinyl alcohol spinning solution with a concentration of about 15% to 16% (wt) from the micropores of the spinneret into a saturated sodium sulfate coagulation bath, dehydrate and coagulate into a primary fiber bundle, and the primary fiber bundle is subjected to the processes of guide roller drawing, wet heat drawing, drying, preheating, dry heat drawing, heat treatment, etc., so that the fibers are oriented and crystallized to become a vinylon filament semi-finished product with certain mechanical properties. Since the vinylon filament contains a high amount of sodium sulfate and does not contain grease, it cannot be sold and used directly, and can only be called a semi-finished product; usually, a special post-processing equipment is used to wash, oil, dry, and cool the semi-finished filaments, and the filaments after the above post-treatment are packed and packaged by a swinging wire machine to become vinylon filaments that can be used by textile factories.

[0004] Specific as Figure 1 As shown, a post-processing equipment currently used by our company includes a hydroformylator 100 and a drying device 200. The hydroformylator 100 is provided with a fiber feeding part 101, a front water washing tank 102, a front recovery tank 1031, a hydroformylation tank 103, a rear recovery tank 1032, a first water washing tank 104, a second water washing tank 105, an alkali warm water washing tank 106, a third water washing tank 107, an oil recovery tank 108, an upper oil tank 109, and a liquid pressing component 110 in sequence; the hydroformylator 10 0 is mainly used for hydroformylation, washing and oiling of semi-finished filaments, wherein the hydroformylation section includes a front recovery tank 1031, a hydroformylation tank 103, and a rear recovery tank 1032. When hydroformylation vinylon filaments are produced, the hydroformylation section is started; when water-soluble vinylon filaments are produced, the hydroformylation section is closed, and the filament bundle comes out of the rollers of the front washing tank 102 and directly bypasses the rollers of the first washing tank 104, and enters the rollers of the upper oil tank 109 after bypassing the rollers of each washing tank for several turns.

[0005] A plurality of drying rollers 201 are arranged in the drying device 200, and adjacent drying rollers 201 are arranged in opposite directions. The filament bundle coming out from the end of the hydroformylation machine 100 is sequentially passed around the plurality of drying rollers 201, and is dried by using steam to heat the air, and the air then heats the filament bundle. The drying temperature in the drying device 200 is 110-120°C. After the filament bundle comes out from the last drying roller 201, it is cooled by the indoor air, and then the filament bundle is guided by the oscillating wire machine 300 to be laid in the packaging bag, and is packaged into a finished water-soluble vinylon filament product for sale.

[0006] However, when the water-soluble vinylon filaments made by the above-mentioned spinning heat treatment and post-treatment processes are supplied to back-end manufacturers to prepare stretched and cut yarns, users report that the use effect is not good. The main problem is that when the fibers are stretched and cut into strips, some fibers stick together, which makes it difficult to pull them apart or they break into strands during stretching and cutting, thus affecting the quality of the strips and the spinning quality. Summary of the invention

[0007] The present invention aims to provide a water-soluble vinylon filament production process and production line to solve the technical problem that the water-soluble vinylon filament manufactured by the existing vinylon filament production line and production process is not easily broken or broken into strands when spinning and cutting yarns.

[0008] In order to achieve the above object, the present invention adopts the following technical scheme:

[0009] A water-soluble vinylon filament production process includes a spinning heat treatment process and a post-treatment process. The spinning heat treatment process is used to produce a semi-finished filament bundle, and the post-treatment process includes the following steps:

[0010] S1. Washing: During the washing process, the width of the tow is alternately changed to rub the tow;

[0011] S2, oiling: the tow after water washing enters the oiling machine for oil bath treatment;

[0012] S3, drying: using several dryers to dry the tow in stages, each dryer is arranged at intervals, and the drying temperature of each dryer gradually increases along the running direction of the tow;

[0013] S4. Cooling: The dried tow is cooled on a cooling machine and then packed in bags.

[0014] The principles and advantages of this solution are:

[0015] 1. In the process of washing with water, the width of the tow is changed alternately. Compared with the tow being always in one state or one width, the alternating change of the present application has a certain "kneading" effect on the tow, which is beneficial to the washing of the sodium sulfate in the fiber tow. Finally, the sodium sulfate content in the water-soluble fiber is reduced from the original 1-2% to below 0.5%. The reduction in the sodium sulfate content reduces the problem of fiber adhesion caused by sodium sulfate crystallization. In addition, the tow is alternately changed in width and narrowness during the washing process, and the fiber tow is always in dynamic change, which is beneficial to improve the dispersion between the fiber tows, reduce the adhesion of the tows, thereby improving the product quality and ensuring the uniform breakage of the tows during subsequent drawing and cutting.

[0016] 2. The existing drying equipment used in the post-processing stage of fiber bundles usually makes the bundles pass around several rollers in the drying equipment for one-time drying, and in order to reduce the moisture content of the fibers to below 1%, a temperature of 110-120°C is required; however, the vinylon fiber produced in the present application is a water-soluble fiber, and the moisture content of the fiber bundles when entering the drying equipment is about 50%. Excessively high heating temperature will cause the fiber to heat up too quickly, and the drying temperature is usually higher than the water-soluble temperature of the fibers. When the moisture content is high, it will cause part of the water-soluble fiber surface to melt, and then the fibers will stick together, affecting the fiber dispersion and uniformity.

[0017] The present application performs multi-stage drying on the fiber bundle. When the fiber comes out of the previous dryer and enters the next dryer, the drying temperature of each dryer is configured to be low at the front and high at the back. The low drying temperature at the front will not cause the fiber to melt. As the moisture content of the bundle gradually decreases, the drying temperature gradually increases. At this time, even if the temperature is higher than the water-soluble temperature of the fiber, the possibility of the fiber melting is reduced due to the low moisture content, thereby solving the problem of water-soluble fibers sticking together during the drying stage. The staged drying method has a better drying effect. The moisture content of the water-soluble fiber of the present application is reduced from the original 0.8-1.2% to 0.4-0.5%. The moisture content is further reduced, and the fiber dispersion and uniformity are better.

[0018] 3. Energy saving: The existing drying equipment has only one temperature and uses steam drying. When in use, a large amount of hot air is discharged out of the machine, resulting in heat waste, so the operating cost is high; the present application dries in stages, which can better control the drying temperature and drying time of each dryer, and compared with the existing technology, less heat waste is achieved, which is more energy-saving.

[0019] Furthermore, a long water trough is used to wash the wire bundle. Several groups of wire supporting rods and wire pressing rods are arranged at intervals in the long water trough. The height of the wire pressing rod is lower than that of the wire supporting rod. The wire bundle passes through the lower surface of the wire pressing rod and the upper surface of the wire supporting rod. The width of the wire bundle increases when passing through the lower surface of the wire pressing rod and the upper surface of the wire supporting rod, and the width of the wire bundle decreases after passing through the wire supporting rod.

[0020] Beneficial effects:

[0021] 1. The use of a long water tank to wash the fiber changes the way the fiber runs. The fiber tow only needs to pass through the water washing tank once. Compared with the original winding around the washing roller of the water washing tank for several circles, the problem of entanglement between the front and rear tows is eliminated. The number and time of contact between the tow and the guide roller are reduced, and the frequency of tow winding around the roller is lower.

[0022] 2. The force exerted by the wire pressing rod and the wire supporting rod on the fiber bundle is used to make the naturally narrowed bundle expand and widen to both sides, and the degree of widening of the bundle can be changed by adjusting the vertical distance between the wire pressing rod and the wire supporting rod, so that the width of the bundle changes alternately in the long water tank, which is beneficial to the removal of Glauber's salt, reduce fiber sticking, improve fiber dispersion, and improve product quality.

[0023] Furthermore, the long water tank includes a first water tank and a second water tank, and the filament bundle passes through the first water tank and the second water tank in sequence and stays in each water tank once; the second water tank uses fresh softened water at 40-50°C, and the fresh softened water enters from the rear end of the second water tank and is discharged from the front end, and then returns to the first water tank, enters from the rear end of the first water tank, and is discharged from the front end of the first water tank after reverse water washing.

[0024] The present application also provides a water-soluble vinylon filament production line, which is used in the production process of water-soluble vinylon fiber bundles, including a spinning production line and a post-processing production line. The spinning production line includes a spinning machine, a guide roller drawing machine, a bundling machine, a wet heat drawing machine, a dryer, a preheating machine, a stretching machine, a first shrinking machine, a second shrinking machine, a cooler, a traction machine, and a winding machine arranged in sequence; the post-processing production line includes a long water trough, an oiling machine, several dryers, a cooler, a traction machine, and a swinging machine arranged in sequence.

[0025] Beneficial effects: By providing a new post-processing production line for post-processing water-soluble semi-finished filaments, the operation mode of the filament bundle post-processing has been changed, and the mirabilite washing and drying effects have been improved.

[0026] Furthermore, the post-processing production line is provided with at least four groups of dryers, including a first dryer, a second dryer, a third dryer, and a fourth dryer. The four groups of dryers sequentially adopt the dryer, preheater, stretching machine, and first shrinking machine in the spinning production line.

[0027] Beneficial effects: Four groups of dryers are set up to dry the tows in stages. Compared with the original one-time drying, the problem of partial melting of the tow surface due to too fast temperature rise and subsequent sticking is reduced; the staged drying effect is better, the tows are dried more evenly, and the moisture content of the finished tows is lower; in addition, the dryer, preheater, stretcher and first shrinking machine of the spinning equipment are used as dryers for the post-processing process, which makes full use of the existing spinning equipment and reduces the transformation cost.

[0028] Furthermore, the drying temperature of the first dryer is 80-90°C, and the drying time is 130-170 seconds, the drying temperature of the second dryer is 90-100°C, and the drying time is 70-95 seconds, the drying temperature of the third dryer is 100-110°C, and the drying time is 70-90 seconds, and the drying temperature of the fourth dryer is 110-120°C, and the drying time is 70-90 seconds.

[0029] Beneficial effect: The drying temperature is configured from low to high. In the initial stage of drying, a drying temperature lower than the water-soluble temperature of the fiber is used to avoid partial melting of the fiber surface, which in turn leads to the problem of fiber sticking together. In addition, multi-stage drying can achieve better drying effects, more complete fiber drying, and lower fiber moisture content.

[0030] Furthermore, the oiling machine in the post-processing production line adopts the wet heat drawing machine in the spinning production line.

[0031] Beneficial effect: Using the wet heat traction machine as an oiling machine can achieve multiple uses of one machine, which is beneficial to saving equipment and reducing equipment purchase costs.

[0032] Furthermore, a long water trough is arranged above the oiling machine through a supporting platform, including a first water trough and a second water trough from top to bottom; a wire guide machine is also arranged on the supporting platform, including a first wire guide machine, a second wire guide machine, and a third wire guide machine. The first wire guide machine is located in front of the first water trough, the second wire guide machine is arranged between the first water trough and the second water trough, and the third wire guide machine is arranged at the outlet of the second water trough.

[0033] Beneficial effect: The first wire guide machine is used to feed the front end of the wire bundle into the first water tank for traction. After the first water washing, the wire bundle enters the second water tank under the traction of the second wire guide machine, and then enters the back-end processing equipment under the traction of the third wire guide machine.

[0034] Furthermore, the first wire guide machine, the second wire guide machine and the third wire guide machine are independently controlled by separate driving mechanisms, and the speed of the second wire guide machine is lower than that of the first wire guide machine, and the speed of the third wire guide machine is lower than that of the second wire guide machine.

[0035] Beneficial effect: Multiple groups of wire guide machines are independently driven, and the tightness of the wire bundle during operation can be adjusted by controlling the wire guide machines individually during use; the running speed of the wire guide machines of the present application is gradually reduced, which can make the wire bundle in a slightly relaxed state, thereby being more conducive to washing out the Glauber's salt in the fiber bundle.

[0036] Furthermore, the speed of the second wire guide machine is 0.3 to 0.5 m / min lower than that of the first wire guide machine, and the speed of the third wire guide machine is 0.3 to 0.5 m / min lower than that of the second wire guide machine.

[0037] Beneficial effect: When the speed difference is less than 0.3m / min, the tow tension is too large, and the tow naturally narrows too much, which is not conducive to washing out the sodium sulfate. When the speed difference is greater than 0.5m / min, although the tow does not naturally narrow, which is conducive to washing out the sodium sulfate, the tow tension is too small and the tow pulling is difficult. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the post-processing equipment before improvement;

[0039] Figure 2 This is a schematic diagram of the connection of the spinning production line in Example 1;

[0040] Figure 3 This is a connection diagram of the improved post-processing production line;

[0041] Figure 4 for Figure 3 An enlarged schematic diagram of the oiling machine;

[0042] Figure 5 for Figure 3 Schematic diagram of a medium-length sink;

[0043] Figure 6 for Figure 5 An enlarged schematic diagram of part of the structure of the medium-length water tank;

[0044] Figure 7 for Figure 6 A top view of

[0045] Figure 8 for Figure 6 An enlarged schematic diagram of the middle lifting assembly;

[0046] Fig. 9 for Figure 8 Enlarged cross-sectional view at A1 in the figure. DETAILED DESCRIPTION

[0047] The following is further described in detail through specific implementation methods:

[0048] The reference numerals in the drawings of the specification include: hydroformylation machine 100, fiber feeding section 101, front water washing tank 102, front recovery tank 1031, hydroformylation tank 103, rear recovery tank 1032, first water washing tank 104, second water washing tank 105, alkali warm water washing tank 106, third water washing tank 107, oil recovery tank 108, upper oil tank 109, liquid pressing assembly 110, drying equipment 200, drying roller 201, swinging wire machine 300, one-unit spinning machine 4011, two-unit spinning machine 4012, one-unit guide roller drawing machine 4021, two-unit guide roller drawing machine 4022, bunching machine 403, wet heat drawing machine 404, dryer 405, preheating Machine 406, stretching machine 407, first shrinking machine 408, second shrinking machine 409, cooling machine 410, traction machine 411, winding machine 412, first wire guide machine 501, long water trough 5024, first water trough 502, second wire guide machine 503, second water trough 504, third wire guide machine 505, oiling machine 507, oil bath 5070, wire pressing guide rod 5071, oil inlet pipe 5072, oil return pipe 5073, first dryer 508, second dryer 509, third dryer 510, fourth dryer 511, fifth dryer 512, wire pressing rod 11, wire supporting rod 12, mounting seat 121, lifting rod 13, slide 131.

[0049] Embodiment 1

[0050] A water-soluble vinylon filament production line includes a spinning production line and a post-processing production line, such as Figure 2 As shown, the spinning production line includes a spinning machine, a guide roller drawing machine, a bunching machine 403, a wet heat drawing machine 404, a dryer 405, a preheating machine 406, a stretching machine 407, a first shrinking machine 408, a second shrinking machine 409, a cooling machine 410, a traction machine 411, and a winding machine 412 arranged in sequence; wherein, in this embodiment, the spinning machine and the guide roller drawing machine are two groups, namely, a one-unit spinning machine 4011, a two-unit spinning machine 4012 and a one-unit guide roller drawing machine 4021, a two-unit guide roller drawing machine 4022, and two groups of tows come out from the rear end of their respective guide roller drawing machines and enter the bunching machine 403 to merge the two tows into one group; in other embodiments other than this embodiment, the number of guide wire machines and guide roller drawing machines can also be set to one group or three groups or more as needed.

[0051] like Figure 3As shown, the post-processing production line includes a long water tank 5024, an oiling machine 507, a plurality of dryers 200 arranged at intervals, a cooling machine 410, a traction machine 411, and a swinging machine 300 arranged in sequence; the post-processing production line is used to wash, oil, and dry the semi-finished fiber bundles obtained through the spinning production line. The post-processing production line in this embodiment is transformed from an existing idle spinning production line. Specifically, the wet heat drawing machine 404 in the spinning production line is used as the oiling machine 507, and the dryer 405, preheating machine 406, stretching machine 407, first shrinking machine 408, and second shrinking machine 409 in the spinning production line are used as drying equipment of the post-processing production line, and a supporting platform is built above the wet heat drawing machine 404, and a long water tank 5024 is set up to be used as a washing machine.

[0052] Specifically, this embodiment takes the setting of four groups of drying equipment as an example, including a first dryer 508, a second dryer 509, a third dryer 510, and a fourth dryer 511. The four groups of drying equipment sequentially adopt the dryer 405, the preheating machine 406, the stretching machine 407, and the first shrinking machine 408 in the spinning production line.

[0053] The wet heat drawing machine 404 is used as an oiling machine 507, specifically as follows Figure 4 As shown, an oil inlet pipe 5072 and an oil return pipe 5073 are provided at the bottom of the wet heat drawing machine 404, and the oil inlet pipe 5072 and the oil return pipe 5073 are connected to an oil bath circulation tank (not shown in the figure) through a connecting pipe. A circulation pump is provided in the oil bath circulation tank, and the oil is pumped into the oil bath tank 5070 of the wet heat drawing machine 404 through the circulation pump, and returned to the oil bath circulation tank through the oil return pipe 5073 after use; the consumed oil and water are replenished in the oil bath circulation tank after metering, so that the oil concentration of the oil bath circulation tank is maintained at about 7g / L. A wire pressing guide rod 5071 is also provided in the oil bath tank 5070 of the wet heat drawing machine 404, and the wire bundle passes through the lower surface of the wire pressing guide rod 5071, so that the wire bundle is completely immersed in the oil and the wire bundle is fully in contact with the oil; a liquid pressing component 110 is also provided at the end of the wet heat drawing machine 404, and the liquid pressing component 110 is used to squeeze out excess oil on the wire bundle.

[0054] The long water tank 5024 is a newly designed device, which is arranged above the wet heat drawing machine 404 through a supporting platform. Figure 5 As shown, several groups of screw supporting rods 12 and screw pressing rods 11 are arranged at intervals in the long water trough 5024. The height of the screw pressing rod 11 is lower than that of the screw supporting rod 12. The wire bundle passes through the lower surface of the screw pressing rod 11 and the upper surface of the screw supporting rod 12. The width of the wire bundle increases when passing through the lower surface of the screw pressing rod 11 and the upper surface of the screw supporting rod 12, and the width of the wire bundle naturally decreases after leaving the screw supporting rod 12.

[0055] Specific as Figure 6-7As shown, in this embodiment, the screw rod 12 and the screw pressing rod 11 are both glass guide rods, and the glass guide rods are arranged along the width direction of the long water trough 5024; the two opposite side walls of the long water trough 5024 are connected with a mounting seat 121 by bolts, and the mounting seat 121 is provided with a mounting groove, and the two ends of the screw rod 12 extend into the mounting groove and are clamped or tensioned with the mounting groove. The position of the screw rod 12 after connection is fixed, and the screw pressing rod 11 is adjustably arranged in the long water trough 5024 through a lifting assembly.

[0056] like Figure 8-9 As shown, the lifting assembly includes a lifting rod 13 and a mounting seat 121 connected to the bottom of the lifting rod 13, and a mounting groove is also provided on the mounting seat 121, and the two ends of the pressing rod 11 are extended into the mounting groove for fixing; in this embodiment, in order to guide and limit the pressing rod 11, vertical slide grooves 131 are provided on the two opposite side walls of the long water trough 5024, and the mounting seat 121 is slidably arranged in the slide groove 131; or a vertical guide rail is provided on the inner wall of the long water trough 5024, and a slide groove 131 is provided on the vertical guide rail, and the mounting seat 121 is slidably arranged in the slide groove 131. Under the lifting action of the lifting rod 13, the pressing rod 11 is driven to move up and down in the slide groove 131. In this embodiment, a vertical guide rail is preferably provided on the inner wall of the long water trough 5024.

[0057] Specific as Figure 8 As shown, the lifting rod 13 in this embodiment adopts a hat-shaped square head bolt, the bottom of the bolt is hat-shaped, and is rotatably arranged on the top of the mounting seat 121, so that the lifting rod 13 can rotate relative to the mounting seat 121; a thread is arranged on the middle and upper end of the lifting rod 13, and a mounting plate is fixed to the top of the vertical guide rail by bolts, and the lifting rod 13 is threadedly connected to the mounting plate. Specifically, the top of the lifting rod 13 is a square head, which is convenient for using a wrench to rotate the lifting rod 13, thereby adjusting the height of the screw pressing rod 11.

[0058] Before use, use a wrench to rotate the square head of the lifting rod 13, and the lifting rod 13 moves up and down, thereby driving the mounting seat 121 and the screw pressing rod 11 to move up and down. By adjusting the up and down positions of the screw pressing rod 11, the silk bundle is kept at a certain immersion depth; when the position of the screw pressing rod 11 is lower than the screw supporting rod 12, the naturally narrowed silk bundle expands to both sides under the downward pressure of the screw pressing rod 11, thereby widening the silk bundle, and the width increases with the increase of the vertical distance between the screw pressing rod 11 and the screw supporting rod 12; under the action of multiple groups of screw supporting rods 12 and the screw pressing rod 11, the silk bundle is alternately changed in width, which has a certain "kneading" effect on the silk bundle, which is beneficial to the washing of the sodium sulfate in the fiber and improves the cleaning efficiency and cleaning effect.

[0059] like Figure 3As shown, in this embodiment, the long water trough 5024 is set into two groups, including the first water trough 502 and the second water trough 504 from top to bottom, and a wire guide machine is also arranged on the supporting platform, including the first wire guide machine 501, the second wire guide machine 503, and the third wire guide machine 505. The first wire guide machine 501 is located in front of the first water trough 502, the second wire guide machine 503 is arranged between the first water trough 502 and the second water trough 504, and the third wire guide machine 505 is arranged at the outlet of the second washing trough 505; and the first wire guide machine 501, the second wire guide machine 503, and the third wire guide machine 505 are independently controlled by a separate driving mechanism, the speed of the second wire guide machine 503 is lower than that of the first wire guide machine 501, and the speed of the third wire guide machine 505 is lower than that of the second wire guide machine 503; through the above arrangement, the silk bundle can be in a slightly relaxed state, which is more conducive to washing out the mirabilite in the fiber silk bundle.

[0060] During water washing, the semi-finished spool cart is pushed in front of the spinning machine, and the filament bundle is sent to the entrance of the first wire guide machine 501 through the channel guide rod and the tension frame, and is continuously unwound from the spool cart under the traction of the first wire guide machine 501; then it enters the first water tank 502, the second wire guide machine 503, the second water washing tank 505, and the third wire guide machine 505 in turn; wherein, the filament bundle only stays in each water washing tank once when passing through the first water tank 502 and the second water washing tank 505 in turn; and the second water washing tank 505 uses fresh softened water of 40-50°C, and the fresh softened water enters the front end from the rear end of the second water washing tank 505 and is discharged, and then returns to the first water tank 502, enters from the rear end of the first water tank 502, and is discharged from the front end of the first water tank 502 after reverse water washing.

[0061] Embodiment 2

[0062] This embodiment also provides a water-soluble vinylon filament production process, including a spinning heat treatment process and a post-treatment process, wherein the spinning production line provided in the first embodiment is used to produce semi-finished filament bundles, and the post-treatment production line is used to perform post-treatment operations on the semi-finished filament bundles. Specifically, this embodiment takes the production of water-soluble vinylon filaments with a water-soluble temperature above 90°C as an example to provide a detailed production process description, wherein the spinning heat treatment process steps are as follows:

[0063] First, the polyvinyl alcohol spinning stock solution is metered, filtered, spun, dehydrated and coagulated by a spinning machine and drawn by a guide roller drawing machine to become solid primary fibers. In this embodiment, two spinning units are specifically used, and the two spinning units spin out a group of primary fibers respectively, which enter the bundling machine 403 after passing through a number of channel guide rods and are gathered into a total bundle of fibers.

[0064] The bundled filament bundle enters the wet heat drawing machine 404 for wet heat drawing to make the fiber acquire certain mechanical properties and heat resistance. After wet heat drawing, the fiber carries 60% to 70% water and sodium sulfate. The filament bundle is dried by heating in the dryer 405, and the moisture content of the filament bundle is reduced to 4% to 5%, and the temperature reaches 100 to 125°C.

[0065] The dried filament bundle enters the preheating machine 406, which further heats the filament bundle to further remove the residual moisture in the filament bundle, and the temperature reaches 190-200°C, which is in a softened state, and then enters the stretching machine 407. The speed difference between the stretching machine 407 and the preheating machine 406 is used to complete the dry heat drawing of the filament bundle; after the dry heat drawing of the filament bundle, the polyvinyl alcohol macromolecules change from bending to straightening, and are oriented in the stretching direction to produce hydrogen bonds, and the apparent performance is high strength and low elongation.

[0066] After the tow enters the stretching machine 407, it continues to be heated to raise the temperature of the tow to 200-210°C. At this temperature, the internal stress caused by stretching is eliminated, and crystallization occurs between molecules, making the tow resistant to hot water. In order to make the fiber have higher resistance to hot water and more stable mechanical properties, the tow enters the shrinking machine for shrinkage and heat setting. After setting, the tow enters the cooling machine 410 and is cooled to 40-50°C to prevent the tow from yellowing and fix the heat treatment effect. The cooled tow enters the winding machine and is wound on the spool car to obtain a water-soluble vinylon filament semi-finished product with a water-soluble temperature of 90-100°C.

[0067] The semi-finished filaments produced are processed by the post-processing production line provided in Example 1, which specifically includes the following steps:

[0068] S1, fiber feeding stage: place one or two spool carts in front of the spinning machine, loosen the brake belt on the spool, and under the traction of the first wire guide machine 501, the water-soluble vinylon filament semi-finished product wound on the spool cart is continuously unwound, and passes through the channel guide rod and tension frame above the spinning machine in turn. The tension frame makes the filament bundle flat and gives a certain tension; the brake belt should apply a slight friction resistance to the spool, so that the filament bundle can be unwound at a uniform speed under the traction of the first wire guide machine 501, and the filament bundle maintains a certain tension between the spool cart and the first wire guide machine 501, and enters the long water tank 5024 straightly.

[0069] S2, washing stage: the filament bundle enters the first water tank 502 for the first washing under the traction of the first wire guide machine 501, enters the second water tank 504 for the second washing under the traction of the second wire guide machine 503 after the first washing, and finally enters the bunching machine 403 under the traction of the third wire guide machine 505; wherein, during the washing process, the filament bundle passes through a plurality of groups of wire pressing rods 11 of different heights arranged in the long water tank 5024 in turn, so as to realize the alternate change of the width of the filament bundle, and has a certain "kneading effect" on the filament bundle.

[0070] Among them, in this embodiment, the speed of the second wire guide machine 503 is 0.3-0.5 m / min lower than that of the first wire guide machine 501, and the speed of the third wire guide machine 505 is 0.3-0.5 m / min lower than that of the second wire guide machine 503, so that the wire bundle is washed in a slightly relaxed state, and the wire bundle can be dispersed, which is conducive to the diffusion of the sodium sulfate from the fiber and improves the dispersion of the fiber. In addition, during washing, multiple groups of wire pressing rods 11 of different heights make the wire bundle alternately change in width and narrowness, which has a kneading effect on the wire bundle, which is conducive to the washing of the sodium sulfate in the fiber, improves the washing efficiency and washing effect, and further improves the dispersion of the fiber.

[0071] Specifically, the second water tank 504 uses fresh softened water, which is adjusted to 40-50°C by the second water washing circulation tank, and then pumped to the second water tank 504, enters from the front end of the second water tank 504, and is discharged from the rear end of the second water tank 504 after reverse water washing, returns to the first water washing circulation tank, and then pumped to the end of the first water tank 502, and is discharged from the front end of the first water tank 502 after reverse water washing. The advantage of this arrangement is that the washing efficiency is higher. When the concentration of the mirabilite at the inlet and outlet of the tow and the washing liquid is the same, the average concentration difference of the reverse washing is larger than that of the parallel flow. Under the same washing conditions, the washing tank can transfer mirabilite more effectively.

[0072] S3, oiling stage: the washed fiber bundle enters the oiling machine 507 under the traction of the buncher 403, and is treated with oil in the oil bath tank 5070 of the oiling machine 507; the oil in the oil bath tank 5070 comes from the oil bath circulation tank, is transported to the oil bath tank 5070 by the oil bath circulation pump, and returns to the oil bath circulation tank after use, and the consumed oil and water are added to the oil bath circulation tank after metering, so that the oil concentration in the oil bath circulation tank is maintained at about 7g / L. In addition, in actual use, an oil bath heater can be provided between the oil bath circulation pump and the oil bath tank 5070, and steam is used to heat the oil bath to keep the oil bath temperature at about 50°C.

[0073] S4, drying stage: a plurality of dryers 405 are used to dry the tow in stages, each dryer 405 is arranged at intervals, and the drying temperature of each dryer 405 gradually increases along the running direction of the tow. Specifically, the fiber tow after washing and oiling is dried for at least four groups, wherein the water-soluble vinylon filaments with a water-soluble temperature above 90°C are dried for four stages, and the water-soluble vinylon filaments with a water-soluble temperature below 90°C are dried for five stages; and the drying temperature is configured from low to high in the drying order, and the lower the water-soluble temperature of the water-soluble vinylon filaments, the lower the drying temperature used.

[0074] Specifically, this embodiment takes the production of water-soluble vinylon filaments with a water-soluble temperature of 90°C as an example for explanation. The fiber bundles pass through the first dryer 508, the second dryer 509, the third dryer 510, and the fourth dryer 511 in sequence, wherein the drying temperature of the first dryer 508 is 80-90°C, and the drying time is 130-170 seconds, the drying temperature of the second dryer 509 is 90-100°C, and the drying time is 70-95 seconds, the drying temperature of the third dryer 510 is 100-110°C, and the drying time is 70-90 seconds, and the drying temperature of the fourth dryer 511 is 110-120°C, and the drying time is 70-90 seconds. In the drying process, in order to keep the bundle in a tensioned state, the speed of the rear machine should be slightly higher than the speed of the front machine, specifically, higher than 0.3-0.5 m / min. After four dryings, the moisture content of the fiber bundle is reduced to less than 0.5%.

[0075] S5, cooling stage: the dried filament bundle enters the cooling machine 410, and the cooling roller of the cooling machine 410 is used to cool the fiber filament bundle. The cooling roller passes cooling water at about 33°C to cool the filament bundle to about 45°C.

[0076] S6, packaging stage: the cooled filament bundle enters the swing wire machine 300 under the traction of the traction machine 411, and the reciprocating mechanism in the swing wire machine 300 drives the wire guide tube to swing back and forth and left and right, guiding the filament bundle to be laid in the packaging bag, and after it is fully laid, the bag is sealed and tied to become a finished water-soluble vinylon filament product for sale.

[0077] After the semi-finished yarn bundles are washed, oiled and dried in stages using the above-mentioned post-processing equipment and process, the dispersion of the finished filament is significantly improved when used by back-end manufacturers to prepare stretched-cut yarns. The fibers feel soft and the yarn bundles are opened in a net-like shape without sticky fibers when gently rubbed.

[0078] Embodiment 3

[0079] The difference between this embodiment and the second embodiment is that a water-soluble vinylon filament with a water-soluble temperature below 90°C is produced, and the difference is that five sections of drying are adopted, and the drying temperature of each section of the first four sections is lower than the drying temperature of each section of the second embodiment. Specifically, the drying temperature of the first dryer 508 is 70-80°C, and the drying time is 130-170 seconds, the drying temperature of the second dryer 509 is 80-90°C, and the drying time is 70-95 seconds, the drying temperature of the third dryer 510 is 90-110°C, and the drying time is 70-90 seconds, the drying temperature of the fourth dryer 511 is 100-110°C, and the drying time is 70-90 seconds, and the drying temperature of the fifth dryer 512 is 110-120°C, and the drying time is 70-90 seconds.

[0080] In this embodiment, the semi-finished filaments of vinylon with a water-soluble temperature of 80°C and a water-soluble temperature of 90°C are processed by the post-processing equipment in the background technology and the post-processing production line and production process of the present application to obtain fiber finished products, and samples are randomly selected from the finished filaments, and the samples are tested to obtain various measurement indicators as shown in Table 1 below:

[0081] Table 1: Moisture content, mirabilite content and grade parameters of finished fiber before and after improvement

[0082]

[0083] Table 2: Fiber dispersion rating evaluation criteria

[0084] Fiber grade Web forming performance Viscose fiber A woven fiber that can be kneaded Stranded Fiber Level 1 good none none none Level 2 good have have 3-5 shares Level 3 good have have 5 or more shares

[0085] Fiber dispersion test method: Randomly select a tow of about 1 meter, rub it gently, then fix one end of the tow, pinch the edge of the other end of the tow with the thumb and index finger of one hand, shake the tow to separate it into a net-like shape, and visually inspect it. Evaluate the fiber dispersion grade based on the net-forming performance, cohesive fibers, and stranded fibers of the tow.

[0086] According to Table 1 and Table 2, we can get:

[0087] By adopting the post-processing equipment and process of the present application to produce the same type of water-soluble fiber filaments, the content of Glauber's salt in the final finished filament fibers is reduced from the original 1.3-1.5% to 0.3-0.5%, and the Glauber's salt washing effect is improved by more than 3 times, which effectively reduces the problem of fiber sticking caused by crystallization in the fiber bundles due to the high Glauber's salt content; the water-soluble fibers are dried by segmented drying, and the moisture content of the final product is reduced to below 0.5%, the fiber drying effect is better, the finished fiber filaments are more uniform, and the fiber dispersion is effectively improved. Moreover, due to the changes in the drying effect and drying means, the problem of fiber bundles sticking caused by the melting of the fiber surface during the drying process is solved. The dispersion level of the final finished filament is improved from level 2 to level 1, the fiber feels soft, and the bundles are opened in a mesh shape when gently rubbed, without sticking fibers. When the improved finished filaments are supplied to the back-end manufacturers to manufacture stretch-cut yarns, the fiber breakage is more uniform and the quality of the short fibers is improved.

[0088] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A water-soluble vinylon filament production process, including a spinning heat treatment process and a post-treatment process, wherein the spinning heat treatment process is used to produce a semi-finished filament bundle, characterized in that: The post-processing process includes the following steps: S1. Washing: During the washing process, the width of the tow is alternately changed to rub the tow; S2, oiling: the tow after water washing enters the oiling machine for oil bath treatment; S3, drying: using several dryers to dry the tow in stages, each dryer is arranged at intervals, and the drying temperature of each dryer gradually increases along the running direction of the tow; S4. Cooling: The dried tow is cooled on a cooling machine and then packed in bags.

2. The process for producing water-soluble vinylon filaments according to claim 1, characterized in that: A long water trough is used to wash the wire bundle. Several groups of wire supporting rods and wire pressing rods are arranged at intervals in the long water trough. The height of the wire pressing rod is lower than that of the wire supporting rod. The wire bundle passes through the lower surface of the wire pressing rod and the upper surface of the wire supporting rod. The width of the wire bundle increases when passing through the lower surface of the wire pressing rod and the upper surface of the wire supporting rod, and the width of the wire bundle decreases after passing through the wire supporting rod.

3. A process for producing water-soluble vinylon filaments according to claim 2, characterized in that: The long water tank includes a first water tank and a second water tank. The tow passes through the first water tank and the second water washing tank in sequence and stays in each water tank once. The second water tank uses fresh softened water at 40-50°C. The fresh softened water enters from the rear end of the second water tank and is discharged from the front end, then returns to the first water tank, enters from the rear end of the first water tank, and is discharged from the front end of the first water tank after reverse water washing.

4. A water-soluble vinylon filament production line, used in a water-soluble vinylon filament production process as claimed in any one of claims 1 to 3, comprising a spinning production line and a post-processing production line, characterized in that: The spinning production line includes a spinning machine, a guide roller drawing machine, a bundling machine, a wet heat drawing machine, a dryer, a preheating machine, a stretching machine, a first shrinking machine, a second shrinking machine, a cooler, a traction machine, and a winding machine arranged in sequence; the post-processing production line includes a long water tank, an oiling machine, several dryers, a cooler, a traction machine, and a swinging wire machine arranged in sequence.

5. The water-soluble vinylon filament production line according to claim 4, characterized in that: The post-processing production line is provided with at least four groups of dryers, including a first dryer, a second dryer, a third dryer, and a fourth dryer. The four groups of dryers sequentially adopt the dryer, preheater, stretching machine, and first shrinking machine in the spinning production line.

6. A water-soluble vinylon filament production line according to claim 5, characterized in that: The drying temperature of the first dryer is 80-90°C, and the drying time is 130-170 seconds. The drying temperature of the second dryer is 90-100°C, and the drying time is 70-95 seconds. The drying temperature of the third dryer is 100-110°C, and the drying time is 70-90 seconds. The drying temperature of the fourth dryer is 110-120°C, and the drying time is 70-90 seconds.

7. A water-soluble vinylon filament production line according to claim 6, characterized in that: The oiling machine in the post-processing production line adopts the wet heat drawing machine in the spinning production line.

8. The water-soluble vinylon filament production line according to claim 7, characterized in that: The long water trough is arranged above the oiling machine through a supporting platform, and includes a first water trough and a second water trough from top to bottom; a wire guide machine is also arranged on the supporting platform, including a first wire guide machine, a second wire guide machine, and a third wire guide machine. The first wire guide machine is located in front of the first water trough, the second wire guide machine is arranged between the first water trough and the second water trough, and the third wire guide machine is arranged at the outlet of the second water trough.

9. A water-soluble vinylon filament production line according to claim 8, characterized in that: The first wire guide machine, the second wire guide machine and the third wire guide machine are independently controlled by separate driving mechanisms, and the speed of the second wire guide machine is lower than that of the first wire guide machine, and the speed of the third wire guide machine is lower than that of the second wire guide machine.

10. The water-soluble vinylon filament production line according to claim 9, characterized in that: The speed of the second wire guide machine is 0.3-0.5 m / min lower than that of the first wire guide machine, and the speed of the third wire guide machine is 0.3-0.5 m / min lower than that of the second wire guide machine.

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