Tips for Selecting High-Quality Rubber Rollers

       The spinnability of rubber rollers has always been a focus for cotton spinning enterprises, as it directly affects product quality and is one of the key factors causing high yarn unevenness and many common defects. The selection, manufacturing, surface treatment, and maintenance of rubber rollers are also very important for enterprises.

　　Rubber rollers are classified by hardness: generally divided into high hardness, medium hardness, and low hardness (better elasticity) rubber rollers.

　　For ordinary cotton spinning, rubber rollers with a hardness of 70-80 degrees can be used for coarse yarn spinning. When spinning chemical fibers, the hardness of the rubber rollers should be selected based on the variety, yarn thickness, and quality requirements. For high-count yarns, the hardness should be easy to grasp. Generally, rubber rollers of about 80 degrees are selected for stretching cotton, and the hardness can be appropriately increased when the stretching speed is fast; usually, rubber rollers of about 85 degrees are chosen for spinning chemical fibers and blended varieties; during combing, the hardness of the separating rubber rollers is generally 65-70 degrees, the guiding rubber rollers are 85 degrees, and the first and second rubber rollers before stretching are generally 65-70 degrees, while the rear rubber rollers are 85 degrees. When the stretching speed is relatively high, rubber rollers with higher hardness should be selected; otherwise, deformation fatigue is likely to occur during high-speed operation, and static electricity stripes may occur due to heating. Generally, when the stretching speed is high, rubber rollers of 80-85 degrees are selected.

When spinning high-count pure cotton yarn, soft rubber rollers are generally selected; for spinning coarse-count pure cotton yarn and polyester-cotton yarn, medium-hard rubber rollers are selected; for spinning chemical fibers, hard rubber rollers are used, and hard rubber rollers of about 80-82 degrees can be selected during stretching.

Under the same rocking frame pressure and spinning conditions, the higher the elasticity, the larger the contact area between the sliver and the rubber rollers, resulting in better and more uniform holding power. Conversely, the smaller the contact area between the cotton sliver and the spinning rubber rollers, the more uneven the gripping force, leading to rough knots and details, and the cotton sliver rod becomes more unstable. Due to the large contact area between high-elasticity rubber rollers and rollers, the yarn speed change point moves backward, reducing the length of the floating area, more effectively controlling the movement of floating fibers, and improving yarn quality. On the other hand, high-elasticity rubber rollers recover quickly, controlling the forward movement of fibers, extending the control time of the sliver on the rubber rollers, and reducing the breakage rate.

　　Due to its motion (intermittent reciprocating rotation), the combing separating rubber rollers require the rubber rollers to effectively grip the fibers and have requirements for anti-sticking, anti-fluffing, and anti-winding. Therefore, rubber rollers with high elasticity, low hardness (65-75 degrees), quick and good elastic recovery, good wear resistance, and strong anti-winding capability should be selected. The surface line speed of the combing stretching rubber rollers is high (over 100 meters/minute), requiring higher dryness for the cotton sliver, and common defects in the cleaning part of the combing machine's stretching section can easily cause winding. Therefore, combing stretching should use rubber rollers with medium hardness (70-75 degrees) and good elasticity. The stretching rubber rollers should have good anti-winding properties, strong wear resistance, heat resistance, and oil resistance, as well as medium to high hardness (78-85 degrees). The coarse yarn stretching rubber rollers should be double-layer or aluminum-lined rubber rollers, with good winding resistance, elasticity, strong grip, medium hardness (72-78 degrees), and good wear resistance. Spinning should use medium to low hardness (63-75 degrees, pure chemical fiber products 75-83 degrees) and high-elasticity rubber rollers.