Rubber Type For Rubber Roller

1. The rise of polyurethane rubber. Polyurethane rubber has excellent comprehensive performance, it has a wide range of hardness (can be from Shaoer A40-Shaoer D80), high mechanical strength, wear resistance (5~10 times of ordinary rubber), good oil resistance, good vibration absorption performance, and easy cutting Etc. Since the 1970s, it has been used in rubber rollers and has replaced many traditional rubbers. It has almost reached the point of equalization with ordinary rubber. Now the advanced cold-rolled steel sheet unit has a line speed of about 1000m/min. The line pressure is also required to be 80kg/cm or more, and ordinary rubber and nitrile rubber cannot meet the requirements. Therefore, the installed rubber roller is more than 66%, especially the tension roller and the tension roller are changed to cast polyurethane roller. Some steel rolls, such as measuring rolls and load-bearing rolls, are made of polyurethane rubber rolls that have high mechanical strength and are more flexible than steel rolls in order to reduce the impression on the steel plate. With the technological advancement of the paper-making rubber roller, the line speed exceeding the line speed of 150kg/cm is required to reach 1800m/min, and the hardness reaches the Shore D74-80. Although the ordinary rubber can be made of hard rubber to achieve the hardness of this grade, but the toughness is poor, the impact resistance is poor, the wear resistance is not good, the grinding cycle is short, and the large rubber roller with a diameter of nearly 1 m and a length of about 10 m, It is very troublesome to disassemble and grind frequently. Made of high-hardness polyurethane elastomer material, the dressing period of the press roll can be extended by 3 months, and the service life is 4 to 5 times that of ordinary rubber.

Another valuable property of urethane rubber, that is, it swells like other rubbers in organic fluids, but it is removed from the fluid, dried, and the solution is restored to its original size. This makes the low-hardness urethane roller in organic coating. It has been widely used in layer and coating coating operations.
The disadvantage of urethane rubber is that heat generation is large, and heat resistance, particularly heat and humidity resistance, is limited. However, there are many types of polyurethane elastomers, which can be synthesized according to processing requirements, and the room for modification is large. Therefore, the materials and processes are properly selected, and the heat resistance, hydrolysis resistance, and resistance to a certain degree of medium properties will be great.

2, special rubber roller came into being
Due to technological advancement and increasingly harsh conditions, special rubber rollers of various special requirements have emerged. The acid-base washing roller with squeezing function is mainly used in the degreasing, pickling, chemical coating, squeezing and other stages of the steel and metallurgical sheet production line, such as the degreasing lye for 25g/L and the temperature of 70°C-gp. °C. Pickling is dilute sulfuric acid; chemical coating is chromic acid; hydrofluoric acid is also used in stainless steel production line. The preferred choice for adapting to these conditions is chemically resistant, weather-resistant chlorosulfonated polyethylene (Hapalon) rubber. . Due to the wide variety of acid-base medium, concentration, temperature and all conditions, the same formula for chlorosulfonated polyethylene rubber can be considered and used together. The appropriate compounding agent is selected, and the research and development potential of formula rubber is great.

As for the rubber roller for color steel film coating and the rubber roller used under the high temperature conditions of clothing and plastics industry, many domestic manufacturers know that silicone rubber can be used, but it is required because of short service life, easy shelling and bursting. Large silicone rubber rolls with a durable temperature above 250 ° C and a service life of more than half a year are still needed to be solved. Especially in the selection of high-strength silicone rubber, bonding system, improvement of molding vulcanization process, etc., we are looking forward to breakthrough.

As for the soft calender rolls and large-gloss rolls for paper machines, hard rubber or rubber and resin materials are optional. The working conditions are large working line pressure of 300KN/m or more, and the speed is about 1000m/min. The temperature is 120 °C to 150 °C, and the rubber hardness is above D90. There are similar products, and China is still in research and development. In addition, a high-performance, high-hardness paper-making rubber roller that adjusts the crown in the roll surface by oil pressure, and also follows the introduction of papermaking machinery into China.