Hengtian milk protein fiber recommended spinning process
1. Spinning process (taking 16.3tex yarn as an example)
Blowing A002D-A006B-A036C (combing needle) –> A029A –> A076C –> Carding A1860 –> Drawing FA302 (two passes) –> Roving A454G –> Spinning yarn FA502 –> Winding Murata N0.7-7 type
2. Main technical measures for each process
1. Preprocessing (2)
It can be seen from Table 1 that the mass specific resistance of milk protein fiber is large, therefore, pretreatment before the blowing process is very important. Milk protein fiber needs to add a certain amount of moisture and antistatic agent after the fiber is unpacked. According to the test of fiber performance and the screening of antistatic agents, the moisture regain rate of milk protein fiber pure spinning machine is controlled at about 16%, and the added amount of the screened composite antistatic agent is about 1%. At the same time, the relative humidity of the workshop is controlled between 68% and 70% to reduce the impact of static electricity.
2. Opening and cleaning process
Milk protein fiber has good fiber uniformity, less impurities, is fluffy, easy to open, has a low coefficient of friction between fibers, and relatively weak cohesion. Therefore, the cleaning process should adopt the process principles of fine grasping, less impact, and low speed. . During production, the height of the ribs of the beater of the cotton picking machine is 2.5mm, so as to achieve fine grabbing and even mixing. The A036C Porcupine opener uses a combing needle beater to reduce fiber damage. The roll quantity should be appropriately light to avoid the fibers from rubbing into neps during the opening and cleaning process and stabilize the quality of the cotton rolls. In order to prevent the roll layers from being unclear, anti-stick rollers are used and the pressure of the pressing rollers is increased to prevent the adverse effects of roll sticking. After being rolled into a roll, it can be wrapped in a thin plastic mold to prevent oil and water from evaporating. Its main parameters are shown in Table 1.
Table 1 Main process parameters of opening and cleaning process
Items Process Parameters Items Process Parameters
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Dry weight of cotton lap (g/m) 380 A902 evening roller speed (r/min) 300
A036C beater speed (r/min) 420 Lap roller speed (r/min) 11.5
Feeding roller – beater distance (mm) 14 Elongation (%) 1.5
A076C beater speed (r/min) 395
A092 cotton stripping beater speed (r/min) 400
3. Carding process
Milk protein fiber has the characteristics of high strength, good elongation at break, low friction coefficient between fibers, relatively weak cohesion, low moisture regain, smooth and loose. During the processing of the carding machine, fibers are easily deposited between the needle teeth, making fiber transfer difficult. Therefore, in order to facilitate the smooth transfer of fibers from the licker-in to the cylinder, spin out a clear cotton web and reduce fly and For neps, the speed ratio of the lick-in roller and the cylinder needs to be appropriately increased, and the speed of the cylinder and the lick-in roller should be appropriately reduced to improve the quality of the yarn, reduce fiber damage, reduce the amount of short lint in the card sliver, and reduce waste and cover. Banhua. And appropriately reduce the distance between the cylinder and the doffer to solve the problems of poor transfer and falling cotton net. The process principle of “light quantity, low speed, small pressure” is adopted in production. Its main process parameters are shown in Table 2:
Table 2 Main process parameters of carding machine
Projects Process Parameters Projects Process Parameters
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Raw sliver quantity (g/5m) 16.3 Cover speed (r/min) 96
Cylinder speed (r/min) 310 Cotton feed plate-licker-in roller distance (mm) 0.26
Doffer speed (mm) 28.9 Cylinder-cover plate distance (mm) 0.28 0.25 0.23 0.23 0.25
Licker-in speed (r/min) 850 Cylinder-doffer distance (mm) 0.25
4. Drawing process
Since the milk protein fibers are fluffy and have relatively weak cohesion, the fiber straightening and parallelism in the drawing sliver is poor and there are a large number of hook fibers. Therefore, the drawing should try to increase the fiber straightening and parallelism and reduce its weight unevenness. Combined drafting is carried out using two passes of 8 slivers each. The mass specific resistance of milk protein fiber fiber is large, and the electrostatic phenomenon is serious. The vehicle speed should be appropriately reduced to prevent the fiber from wrapping around the rubber roller and roller. In order to improve the evenness and reduce the hairiness of the yarn, the process parameters of large draft in the first and rear areas and small draft in the second and rear areas are beneficial to the improvement of fiber parallel straightness. It is necessary to increase the pressure appropriately to ensure sufficient The holding force is adapted to the drafting force to ensure that the fiber speed change points are concentrated during the drafting process to improve the evenness level. In actual productivity, the process principles of “multiple parallel heads, heavy pressure, medium quantity, and large distance” are adopted. Its main process parameters are shown in Table 3.
Table 3 Main process parameters of drawing process
Items Process Parameters Items Process Parameters
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The first path, the second path, the first path, the second path
Dry weight (g/5m) 15.6 15.7 Output speed (m/min) 200 200
Roller center distance (mm) 45×55 45×55 Rear area draft Rear area draft multiple (times) 1.820 1.284
Top roller pressure (Kg) 30×32×30×6 30×32×30×6 Front area drafting multiple (times) 4.596 6.243
5. Roving technology
Milk protein fiber has long fiber length, large mass specific resistance, and small friction coefficient. Therefore, on the premise that the spinning yarn does not produce hard ends, the twist coefficient of the roving should be appropriately large, and the elongation should be controlled to reduce accidental elongation to facilitate Improve evenness. When the rovings do not overlap, the winding density of the rovings should be appropriately large, which will help reduce the hairiness of the yarn. The draft ratio in the rear area is too small and the draft ratio in the front area is too large to ensure the evenness of the roving. Its main process parameters are shown in Table 4.
Table 4 Main process parameters of roving process
Projects Process Parameters Projects Process Parameters
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Roving basis weight (g/10m) 4.12 Spindle speed (r/min) 534
Elongation (%) 1.36 Rear area draft ratio 1.26
Central zone collector (mm) 6×4 Roving twist coefficient 80
Front collector (Kg) 8 Pressurized weight (kg/spindle) 32×16×28
6. Spinning craft
Since the fiber has the characteristics of relatively weak cohesion, softness and smoothness, it is easy to produce a large amount of hairiness and thick details during spinning. Therefore, larger twist, small back area draft multiple, large back area roller gauge, and clamp should be used. The process principle of small mouth spacing is shown in Table 5 for its process parameters.
Table 5 Main process parameters of spun yarn
Projects Process Parameters Projects Process Parameters
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Spindle speed (r/min) 15600 Jaw gap (mm) 2.5
Roller gauge (mm) 19×29.5 Spinning yarn twist coefficient 335
Roller pressure (Kg/double spindle) 18×14×16 Rear area draft multiple (times) 1.29
7. Winding process
The winding process adopts electronic yarn clearer, air splicer joint, and the drum speed is 1800r/min. The yarn quality is shown in Table 6, which meets the design requirements.
Item: Actual measurement value: Item: Actual measurement value
————————————————– ————————–
Fineness/tex 16.42 2mm hairiness (root/10m) 178
Weight deviation (%) +0.76 3mm hairiness (root/10m) 62
Single strength (CN/tex) 19.97 Details (pieces/km) 21
Single strength CV value (%) 10.9 Thick joints (pieces/km) 102
100 weight CV value (%) 0.68 Neps (pieces/km) 132
Evenness CV value (%) 13.7
3. Conclusion:
Milk protein fiber has good fiber uniformity, less impurities, is fluffy, easy to open, and has good fiber spinnability. However, the friction coefficient between fibers is low, the cohesion force is relatively weak, and the mass specific resistance is large. Therefore, certain pretreatment must be carried out. . Among them, the key is to properly handle the moisture regain rate on the machine and the screening and dosage of antistatic agents to ensure good yarn quality. Milk protein fiber can be used to develop knitted and woven fabrics. It has strong market competitiveness, broad prospects, and good economic and social benefits.
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