With the rapid development of new technologies, new techniques, new equipment and new devices, as well as the limitations of understanding new technologies in the manufacture of rubber rollers, there are often many misconceptions in the actual use, resulting in many unnecessary quality problems.
Pure cotton varieties try to choose free processing rollers; polyester cotton varieties depending on the number of blending try to use free processing and micro-processing rollers; pure polyester varieties generally choose processing rollers, but enterprises with good temperature and humidity control can choose micro-processing; users with high-quality requirements, generally choose free processing, low-quality requirements, generally choose processing rollers.
When choosing the diameter of the rubber roller, it is often on the large side to master, even up to about 36 mm, with good elasticity, and more times of back grinding, both to save costs and to improve quality. The large diameter of the rubber roller is conducive to the extension of the drafting force boundary, but the deformation of the rubber roller is pressed into an ellipse and mechanical waves so that the CVb value increases seriously.
Countermeasures: According to its actual situation, reasonably choose the diameter of the rubber roller. If you need to increase it, you should also consider the process support and back grinding cycle to avoid waste and quality deterioration.
The aluminium-lined rubber roller has good pressure resistance and stability, but is expensive; the double-layer rubber roller has a long maturing period, a large set of differential internal stress and is easy to age in the concave, but the price is relatively cheap.
Response: Take what you need, use aluminium lining for high-quality requirements, and use a double layer for low-quality requirements.
The main consideration for the selection of the rear area rubber roller with the principle of hardness is that the front rubber roller is generally 5 ~ 10 degrees higher, and the diameter is generally smaller than the front rubber roller by 0.5 mm ~ 1.5 mm. but for V-drawing, the diameter is better than the front gear rubber roller. If the old rubber rollers are used, the rubber aging degree is not the same, resulting in inconsistent hardness of the rear rubber rollers, resulting in uneven weight of the yarn and increased spindle difference, while the change of the friction boundary is also easy to out of the hidden hard head and hidden mechanical wave.
Countermeasures: If the back rubber rollers are of a slightly lower grade, choose slightly harder and smaller diameter processing rubber rollers, except for V-drawing.
The general principle of rubber ring selection is the principle of soft on the top and hard on the bottom, soft on the outside and hard on the inside, and loose on the bottom and tight on the bottom, using the method of matching the old with the new in order to reduce the going ripening period. The emphasis on the cycle and the need for wear resistance often lead to the selection of thick, hard rings, resulting in the upper and lower rings running out of sync and stuttering.
Countermeasures: Choose the size of the rubber ring according to the type of yarn being spun, the type of top pin, the form of pressure, and the amount of pressure. Cotton is generally thinner and softer, while chemical fibers are generally thicker and harder, but attention must be paid to the upper and lower collocation, and the total thickness should not exceed 2 mm. special attention must be paid to the pressure of the leaf spring, as the lack of elasticity, hard pressure, so the perimeter of the rubber ring should be appropriate larger.
The issue of grease is one of the easiest for companies to overlook. In fact, many enterprises use grease improperly, according to the requirements should select extreme pressure lithium base grease, but many enterprises choose ordinary lithium base grease. The main reason is that ordinary lithium grease is not resistant to high temperatures and melts easily. Due to the strong permeability of grease within the rubber, the molecular movement on the surface of the rubber roller is accelerated, the heat resistance of the rubber roller is weakened, and a lot of static electricity is generated on the surface, which leads to the problem of winding flowers and rubber rollers. The key is that many enterprises are not aware of this, and take other methods to solve the problem of winding flowers, the effect is not obvious, a waste of human and material resources.
Countermeasures: choose No. 3 extreme pressure lithium base grease, diligently add, add less, conditional enterprises can add imported grease.
Many enterprises use the same bearing when using aluminum lining and double rubber rollers, in fact, this is completely wrong. As the lining of the aluminium liner is metal aluminium, it is easy to be damaged by friction and needs more lubrication than the double layer, so its gap should be bigger than the double layer. This is to avoid mechanical waves and eccentricity.
Countermeasures: Have a correct understanding of aluminium lined bearings and double layer bearings, eliminate the one-sided view that the smaller the clearance the better the quality, and use different types of upper roller bearings for aluminium lined and double layer.
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