The combing rubber roller is an important drafting device and plays a key role in the production efficiency of the combing process, the quality of the semi-finished products and the finished product. At present, many cotton textile companies are affected to varying degrees.
Trouble with the problem of wrapping the rubber roller, and actively seek to solve the best way to wrap the rubber roller.
1 characteristics analysis and use of combing rubber roller
1.1 Characteristics of ordinary rubber rollers
The combing rubber roller is also divided into ordinary rubber roller and rabbit processing rubber roller. Usually, the common combing rubber roller is used for surface grinding after a period of time. After the grinding, the rubber roller after the coating treatment changes the rubber.
The molecular structure of the surface of the roller is easy to age on the surface, and the coating layer is easy to fall off and crack. Especially after several times of grinding, the diameter of the rubber roller is reduced, the hardness is increased, the elasticity is lacking, and the holding is not
Good, will affect the quality of combed cotton.
1.2 The use of free processing separation roller
The comb-free process roller improves the wear resistance, antistatic properties and entanglement resistance of the rubber roller. For example, the Swiss Baker can handle the spinning of the separation roller without grinding surface after grinding.
High elasticity, small deformation and excellent anti-winding performance. The quality level of domestic process-free rubber rollers (such as WRC-965, WRC-073 and WRC-975) is close to that of imported rubber rollers.
The separation rubber roller is intermittently reciprocating, so it should have high elasticity, low hardness (Shryl A65 degree), strong elastic recovery ability, good wear resistance and strong anti-winding ability.
After the surface of the separation-free rubber roller is viscous, the surface of the rubber roller is sticky and cuffed. After the machine is installed, the rubber roller will be seriously flowered. It will disappear after a few days of operation. After several rounds of grinding, the diameter is
Gradually decreasing, the surface hardness is increased, and the anti-winding performance is worse.
After careful observation, we found that - the Swiss Baker rubber roller, which has not been honed, has formed a fine and smooth film on the surface, as long as it is regularly used to warm the wet cloth.
The surface is clean, still has good spinnability and moisture absorption and desorption performance, the surface is clean, anti-winding, elastic recovery, the grip grip is balanced, and the yarn quality is stable.
The anti-winding performance of the domestic rubber roller is slightly poor, and the rapid micro-treatment coating can be used to achieve the purpose of smooth and dry surface of the rubber roller, but it should be noted that the coating coverage cannot be too thick.
In order to avoid affecting the grip performance of the rubber roller, the micro-coating treatment auxiliary surface ultraviolet light treatment is an effective measure to improve the anti-winding performance of the domestic rubber roller.
For enterprises with large fluctuations in temperature and humidity, the use of a suitable proportion of carbon black composite coating can also improve the antistatic properties. When the hardness of the rubber roller is above 70 degrees of Shore, the composite coating is
After the treatment, it should be naturally dried for more than 72 hours, and lightly ground with fine sandpaper.
1.3 characteristics of the drafting roller and reasonable use
The speed of the drawing rubber roller is high, and it is prone to flowering, entanglement and congestion. Generally, it is necessary to shorten the regrinding cycle of the rubber roller, and select a composite coating with strong antistatic and anti-winding properties.
In order to improve the yarn quality level, a medium-hardness rubber roller can be selected. The hardness of the first rubber roller is about 70 degrees Shoal, and the second and third rubber rollers are about 75 degrees Shoal. Imported drawdown roller only
There must be no mechanical waves, and there is no need to grind.
1.4 Adjustment of grinding process of domestic common separation rubber roller
(1) Before grinding, use the dial indicator to check the radial runout of the left, middle and right points. It must be s0.02mm, and then it can be ground on the grinding machine after passing the test.
(2) The amount of grinding should not be too large each time, and the grinding amount during fine grinding should be controlled within 0.1-0.15mm.
(3) The speed of the carriage can be controlled at 400-500mm/min, and the number of reciprocations should be 3 strokes.
(4) Increasing the linear speed of the grinding wheel can effectively reduce the surface roughness of the rubber roller. When grinding the separation rubber roller, the linear speed of the grinding wheel is as high as possible, and is generally controlled at about 30 m/s.
2 Analysis and solution of winding of combing rubber roller
2.1 drafting rubber roller
The drawing rubber roller has a high rotation speed, is easy to generate static electricity, and absorbs fibers to cause entanglement. Moreover, the rubber roller cleaner and the surface of the rubber roller are in linear contact, and the adaptability to temperature and humidity is poor, and it is easy to be entangled due to poor contact between the cleaner and the rubber roller.
(1) Use a cleaning rubber sleeve with a diameter of about 20mm (the rubber sleeve material for the cleaner under the slats), and directly coat it on the steel strip iron iron cleaner. The two sides of the rubber sleeve should be tightly placed on the original long strip of iron. On the bracket, the rubber sleeve is not allowed to rotate after driving, so as to increase the friction between the rubber sleeve and the rubber roller. The rubber sleeve and the rubber roller are in surface contact and have a strong cleaning effect, and can effectively remove the accumulated flower adhered to the surface of the rubber roller, which can reduce The rubber roller is entangled due to the electrostatic adsorption of the fiber.
(2) Cut the 195mm long spinning frame to scrap the lower rubber ring, and stick it with the universal glue on the original long strip iron iron cleaner (some manufacturers use organic soft material) to make it face contact with the rubber roller. It can also reduce the effect of winding the rubber roller.
(3) To ensure the sensitivity of the photoelectric and mechanical self-stop of each part, the pressure roller piston rod is connected with the grounding wire, so that the static electricity formed on the surface of the rubber roller can be quickly directed to the ground to reduce the probability of the rubber roller being entangled.
2.2 Separation rubber roller.
The temperature and humidity fluctuate greatly, the drafting ratio of the preparation process is too high, the small volume is too light, the sugar content of the raw material is too high, and the temperature and humidity are not well controlled, which may cause the winding of the separation rubber roller.
(1) Control the moisture regain of the raw materials, and the moisture regain of the combed strips should not be lower than 5.5% under normal conditions. The fibers should always be in a dehumidified state during processing to reduce static electricity. In the clearing, carding and combing processes, humidifying nozzles can be added to increase the humidity in the workshop.
(2) The temperature of the combing workshop should not be lower than 25 °C, and the relative humidity should not be lower than 50%. The humidity of small fibers is easy to generate static electricity, usually the relative humidity is controlled at 55-60%, generally not more than 65%, otherwise it will Causes winding around the roller. The amount of moisture in the air is closely related to the operating efficiency and product quality.
(3) Where conditions permit, the preparation process may select a lower draw ratio, a heavier lap count, a longer feed length, and a forward feed cotton process.
(4) When using raw cotton with a sugar content of 3.0 or higher, if the separation rubber roller is stuck, wrapped, wound, etc., the ratio should be reduced or the raw cotton with a sugar content of 2.5 or less should be reduced, if conditions permit. Understand as much as possible the lower temperature and relative humidity of the workshop.
(5) Add a proper amount of lubricating oil, with a slight spill as well, and wipe off the spilled grease to avoid contamination of the roller and the rubber roller. Keep the surface of the separation roller clean, clean the surface of the cleaning roller, and replace the surface of the rubber roller with a knife or crack.
(6) Using the WTB rubber roller quick-acting anti-disturbing agent, the problem of separating the rubber roller can be quickly solved, and the middle part of the rubber roller can be directly wiped with the quick-action anti-disturbing agent.
