Process for producing cationic thick and thin yarns

Abstract

The application discloses a cationic thick and thin yarn production process, (a) adopting a crystallization drying device to perform crystallization and drying treatment on cationic chips; then the cationic chips are input into a screw extruder to perform melt extrusion, the obtained melt is input into a spinning assembly after metering to perform spinning and obtain nascent yarn; (b) the nascent yarn is subjected to side-blowing air cooling, bunching and oiling, pre-networking, drafting and setting, main networking and winding forming treatment to obtain cationic thick and thin yarn; the pre-networking pressure is 0.20 MPa. The obtained thick and thin yarn has longer and more uniform knotty strips, the knotty effect is more obvious, and higher use requirements can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fiber production, in particular to a cationic thick and thin yarn production process. BACKGROUND

[0002] The current thick and thin yarn production is usually achieved by adjusting the temperature and speed of the hot roller and the draft multiple to achieve the thick and thin effect and the bamboo joint effect of the fiber; however, the bamboo joint effect of the thick and thin yarn produced by this adjustment mode is not stable enough, the length distribution of the bamboo joint is not uniform enough, which affects the dyeing, moisture absorption and air permeability and other properties of the product, and it is also difficult to obtain longer bamboo joint strips, which cannot meet the higher demand for thick and thin yarn. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide a cationic thick and thin yarn production process, which has longer and more uniform bamboo joint strips, more obvious bamboo joint effect and meets higher use requirements.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A cationic thick and thin yarn production process, comprising the following steps:

[0006] (a) crystallizing and drying the cationic chips using a crystallization drying device; then inputting the cationic chips into a screw extruder for melt extrusion, and inputting the obtained melt into a spinning assembly after metering for spinning to obtain primary yarn;

[0007] (b) cooling the primary yarn by side blowing, collecting and oiling, pre-networking, drafting and setting, main networking and winding to obtain cationic thick and thin yarn; the pre-networking pressure is 0.20 MPa.

[0008] The chip crystallization temperature is 155℃, and the drying temperature is 160℃.

[0009] The heating temperature of each zone of the screw extruder is respectively: zone one 278℃, zone two 283℃, zone three 285℃, zone four 288℃, and zone five 288℃.

[0010] The spinning temperature is 290℃, and the spinning assembly pressure is 12.8 MPa.

[0011] During drafting, the first drafting roller temperature is 63℃, the speed is 1600m / min, and the number of winding turns is 5 turns.

[0012] During drafting, the second drafting roller temperature is 103℃, the speed is 3200m / min, and the number of winding turns is 5 turns.

[0013] The winding speed is 3400m / min.

[0014] The beneficial effects of the present application are: the thick and thin yarns with more obvious slub effect can be obtained by increasing the pre-network pressure, adjusting the hot roller speed and draft multiple, the slub strip is longer and more uniform, so that the fabric after weaving and finishing has better effect, better dyeing, better moisture absorption and air permeability, and higher use requirements can be met. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The structure diagram of the crystallization drying device used in embodiment 2 of the present application;

[0016] Figure 2 The cross-sectional view of A-A direction in the present application; Figure 1

[0017] In the figure: kettle body 1, stirring chamber 11, mounting box 12, partition chamber 2, partition plate 21, inlet 22, stirring paddle 3, stirring blade 31, A gear 32, inner gear disc 33, disc 331, gear ring 332, push plate 4, lead screw 5, B gear 51, guide rod 6, motor 7. DETAILED DESCRIPTION

[0018] The present application will be further described below in combination with the drawings and specific embodiments:

[0019] Embodiment 1

[0020] A cationic thick and thin yarn production process, comprising the following steps:

[0021] (a) The cationic chip is subjected to crystallization and drying treatment by using a crystallization drying device; the chip crystallization temperature is 155℃, and the drying temperature is 160℃. Then the cationic chip is input into a screw extruder for melt extrusion, the obtained melt is input into a spinning assembly for spinning after metering, to obtain a primary yarn; the heating temperatures of each zone of the screw extruder are respectively: 278℃ for the first zone, 283℃ for the second zone, 285℃ for the third zone, 288℃ for the fourth zone, and 288℃ for the fifth zone; the spinning temperature is 290℃, and the spinning assembly pressure is 12.8MPa.

[0022] (b) The primary yarn is subjected to side blowing cooling (the side blowing air pressure is 600Pa, and the air speed is 0.6m / s), bunching and oiling, pre-networking (the pre-networking pressure is 0.20MPa), drafting and setting (the first drafting roller temperature is 63℃, the speed is 1600m / min, and the number of winding turns is 5; the second drafting roller temperature is 103℃, the speed is 3200m / min, and the number of winding turns is 5), main networking (the pressure is 0.30MPa), and winding forming (the winding speed is 3400m / min) treatment, to obtain a cationic thick and thin yarn.

[0023] Embodiment 2

[0024] ​The conventional crystallization drying device is used in the embodiment 1, and the conventional drying device has the problem of insufficient contact between the high-temperature gas and the slice when the slice crystallization drying is performed, which easily causes the unsatisfactory crystallization and drying effect. If the moisture in the slice is not removed completely, the slice will be hydrolyzed when it is melted, which causes the molecular weight of the polymer to decrease, and the moisture in the slice will be vaporized into bubbles at high temperature, which causes the spinning to be interrupted or the yarn to be broken, and affects the product quality. Therefore, the cationic thick and thin yarn is produced according to the method of the embodiment 1, and the improved crystallization drying device is used for drying, which is recorded as the embodiment 2.

[0025] As shown in Figures 1-2 The improved crystallization drying device includes a kettle body 1, partition chambers 2 which are distributed in the kettle body 1, a transversely rotating stirring paddle 3, and a push plate 4 which is movable back and forth below the stirring paddle 3. The partition chambers 2 are open at the upper end and have an inlet 22 at the lower part. The stirring paddle 3 rotates through the kettle body 1 and gaps through each partition chamber 2. The inner cavity of the kettle body 1 is divided into stirring chambers 11 by the partition chambers 2. One push plate 4 is distributed in each stirring chamber 11. A lead screw 5 is rotatably arranged in the kettle body 1 and gaps through each partition chamber 2. Each push plate 4 is moved back and forth by the lead screw 5 and can push the material in the kettle body 1 into the partition chamber 2.

[0026] When the stirring paddle 3 rotates, the lead screw 5 is reversely rotated. One side of the kettle body 1 is provided with a mounting box 12. One shaft end of the stirring paddle 3 penetrates through the kettle body 1 and extends into the mounting box 12. One shaft end of the lead screw 5 penetrates through the kettle body 1 and extends into the mounting box 12. One shaft end of the stirring paddle 3 is respectively fixed with an A gear 32 having half-circle teeth and an inner gear disc 33 having half-circle teeth. The half-circle teeth of the A gear 32 are circumferentially arranged opposite to the half-circle teeth of the inner gear disc 33. One shaft end of the lead screw 5 is fixed with a B gear 51 having whole-circle teeth. When the A gear 32 starts to engage with the B gear 51, the inner gear disc 33 disengages from the B gear 51. When the A gear 32 disengages from the B gear 51, the inner gear disc 33 starts to engage with the B gear 51. The other shaft end of the stirring paddle 3 is connected with a motor 7.

[0027] The A gear 32, the inner gear disc 33, and the B gear 51 are all arranged in the mounting box 12. The inner gear disc 33 includes a disc-shaped disc 331 and an annular gear ring 332 which is connected to the edge of the end face of the disc 331. The inner wall of the annular gear ring 332 is half-circle teeth. The A gear 32 and the B gear 51 are arranged above and below and are both located in the inner circle of the gear ring 332. The disc 331 is located outside the A gear 32. When the stirring paddle 3 rotates, the A gear 32 and the inner gear disc 33 are synchronously rotated. The A gear 32 first drives the B gear 51 to rotate. When the A gear 32 disengages from the B gear 51, the inner gear disc 33 starts to engage with the B gear 51 and drives the B gear 51 to reversely rotate, so that the stirring paddle 3 drives the lead screw 5 to rotate forward and reversely, and further drives the push plate 4 to move.

[0028] The guide rods 6 are distributed in each stirring chamber 11, and the push plates 4 move guided by the guide rods 6. The lower end of the partition chamber 2 is connected to the bottom of the kettle body 1, and the upper end of the partition chamber 2 is spaced from the top of the kettle body 1. The partition chamber 2 comprises a pair of partition plates 21 arranged in the front-rear direction, the front end, the rear end and the lower end of the partition plates 21 are connected to the kettle body 1, and the upper end of the partition plates 21 is spaced from the top of the kettle body 1. The partition chamber 2 is formed between the pair of partition plates 21 and the inner wall of the kettle body 1.

[0029] The stirring paddle 3 comprises a plurality of groups of stirring blades 31, and each stirring chamber 11 is distributed with a group of stirring blades 31.

[0030] Initially, the push plate 4 is located at one end away from the inlet 22, the chips are added into the kettle body 1 and the material level exceeds the height of the partition chamber 2, the chips also fill the partition chamber 2, and the stirring paddle 3 starts to stir. Each push plate 4 is driven to move back and forth, when the push plate 4 moves towards the inlet 22, part of the chips at the bottom of the stirring chamber 11 are pushed into the partition chamber 2, and the chips already in the partition chamber 2 are pushed upwards and then pushed out from the upper end of the partition chamber 2 to be stirred, when the push plate 4 moves away from the inlet 22, part of the chips at the bottom of the stirring chamber 11 are pushed away with the push plate 4, the lower chips in the partition chamber 2 flow out of the partition chamber 2, and part of the chips at the upper part of the kettle body 1 fall into the partition chamber 2. Through the reciprocating pushing of the push plate 4 and the stirring of the stirring paddle 3, the chips can also flow in the partition chamber 2 during stirring, which promotes the movement of the chips, facilitates the contact between the chips and the high-temperature gas, improves the crystallization and drying effect, and further improves the performance of the final fiber product.

[0031] According to the methods of Examples 1 and 2, cationic thick and thin yarns were respectively mass-produced, and it was found that after using the improved crystallization and drying device, the breakage rate per 10,000 tons of fiber produced was reduced by 10.7%, and the hairiness rate was reduced by 13.6%.

[0032] Comparative Example 1

[0033] Cationic thick and thin yarns were produced by a conventional method, which included the following steps:

[0034] (a) The cationic chips were subjected to crystallization and drying treatment by using a crystallization and drying device; the chip crystallization temperature was 155°C, and the drying temperature was 160°C. Then the cationic chips were input into a screw extruder for melt extrusion, the obtained melt was metered and then input into a spinning assembly for spinning to obtain as-spun yarn; the heating temperatures of each zone of the screw extruder were as follows: Zone 1 278°C, Zone 2 283°C, Zone 3 285°C, Zone 4 288°C, Zone 5 288°C; the spinning temperature was 290°C, and the spinning assembly pressure was 12.8 MPa.

[0035] (b) the nascent filaments are cooled by side blowing (side blowing air pressure is 600 Pa, air speed is 0.6 m / s), bundled and oiled, pre-networked (pre-networking pressure is 0.08 MPa), drafted and set (first drafting roller temperature is 76°C, speed is 1600 m / min, number of winding turns is 5; second drafting roller temperature is 110°C, speed is 3200 m / min, number of winding turns is 5), main networked, wound and formed (winding speed is 3400 m / min) to obtain the cationic thick and thin filaments.

[0036] The cationic thick and thin filaments produced by Examples 1-2 and the comparative examples are subjected to performance testing, and the results are shown in Table 1.

[0037] Table 1

[0038]

[0039] The above description is merely preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The application of a crystallization drying device in the production of cationic filament yarn, characterized in that: Includes the following steps: (a) The cationic slices were crystallized and dried using a crystallization and drying device; The cationic chips are then fed into a screw extruder for melt extrusion. The resulting melt is metered and fed into a spinning assembly for spinning to obtain nascent filaments. The crystallization drying device includes a vessel body (1), partition chambers (2) spaced apart within the vessel body (1), a horizontally rotating stirring paddle (3), and a pusher plate (4) located below the stirring paddle (3) that can move back and forth. The partition chamber (2) has an opening at the top and an inlet (22) at the bottom. The stirring paddle (3) rotates through the vessel body (1) and passes through each partition chamber (2) with gaps. The inner cavity of the vessel body (1) is divided by the partition chambers (2) to form a stirring chamber (11). A pusher plate (4) is distributed in each stirring chamber (11). A screw rod (5) rotates through the vessel body (1) and passes through each partition chamber (2) with gaps. Each pusher plate (4) is driven to move back and forth by the screw rod (5) and can push the material in the vessel body (1) into the partition chamber (2). When the stirring paddle (3) rotates, it drives the lead screw (5) to rotate in both directions. One shaft end of the stirring paddle (3) is fixedly equipped with an A gear (32) with half-circle teeth and an internal gear disk (33) with half-circle teeth. The half-circle teeth of the A gear (32) and the half-circle teeth of the internal gear disk (33) are circumferentially opposite to each other. One shaft end of the lead screw (5) is fixedly equipped with a B gear (51) with full-circle teeth. When the A gear (32) and the B gear (51) begin to mesh, the internal gear disk (33) and the B gear (51) disengage. When the inner gear disk (33) disengages from gear B (51), it begins to mesh with gear B (51); when the stirring paddle (3) rotates, it drives gear A (32) and inner gear disk (33) to rotate synchronously. Gear A (32) first drives gear B (51) to rotate. When gear A (32) disengages from gear B (51), inner gear disk (33) begins to mesh with gear B (51) and drives gear B (51) to rotate in the opposite direction, so that when the stirring paddle (3) rotates, it drives the screw (5) to rotate in both directions, thereby driving the push plate (4) to move. (b) The nascent yarn is cooled by side blowing, bundled and oiled, pre-networked, drawn and shaped, main networked, and wound to form cationic thick and thin yarn; the pre-networking pressure is 0.20 MPa; during drawing, the temperature of the first drawing roller is 63℃, the speed is 1600 m / min, and the number of winding turns is 5; the temperature of the second drawing roller is 103℃, the speed is 3200 m / min, and the number of winding turns is 5.

2. The application of the crystallization drying device as described in claim 1 in the production of cationic filament yarn, characterized in that, The crystallization temperature for the slices was 155℃, and the drying temperature was 160℃.

3. The application of the crystallization drying device as described in claim 1 in the production of cationic filament yarn, characterized in that, The heating temperatures of each zone of the screw extruder are as follows: Zone 1 278℃, Zone 2 283℃, Zone 3 285℃, Zone 4 288℃, and Zone 5 288℃.

4. The application of the crystallization drying device as described in claim 1 in the production of cationic filament yarn, characterized in that, The spinning temperature is 290℃ and the spinning assembly pressure is 12.8MPa.

5. The application of the crystallization drying device as described in claim 1 in the production of cationic filament yarn, characterized in that, The winding speed is 3400 m / min.

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