1. Rubber rollers for office equipment
The development of office machinery and equipment is extremely rapid, and these business machinery are directly related to improving the efficiency of business processing. Many types of rubber rollers are used in such machines, such as copiers, typewriters, information processors, desktop computers, and cash registers. The usage of rubber rollers for office machinery in Japan is second only to printing rubber rollers. People's attention has been paid to its technological development and production.
Copier rubber rollers use the largest amount of rubber rollers used in office machinery. Each copier needs at least 5 rubber rollers, and it is also technically representative. The temperature of the fixing roller is 170～200℃, and the rubber roller is not only required to withstand high temperatures. , And does not adhere to toner during operation.
The rubber rollers used in a large number of popular low-speed copiers can be made of room temperature vulcanized silicone rubber. When the speed is increased, high temperature curing silicone rubber can be used. For high-speed copiers, the fixing roller is made of polytetrafluoroethylene, and the surface of the roller is microporous, but because of its adhesion to the coating, it needs to be coated with silicone oil release agent. The pressure roller can be on the surface of the silicone rubber roller. It is coated with a layer of PTFE. In mimeographs, copiers and electronic computers, rubber rollers are usually used to feed paper. This kind of roller is generally a low-hardness rubber roller of 25-40 Shao A to facilitate close contact between the paper and the roller. Since the rubber roller is easy to accumulate static electricity during use, the phenomenon of paper rolling on the roller will occur. In order to solve this problem, metal powder or conductive carbon black is added to the rubber material of the rubber roller outer layer made of natural rubber or synthetic rubber to make the rubber layer antistatic. An antistatic foam rubber layer with a thickness of less than 100 pm is attached to the surface of the roller. This layer of foam rubber is best made of silicone rubber. Due to the function of the foamed rubber layer, the contact force between the paper and the roller is dispersed, and the surface is elastic, completely avoiding the phenomenon of paper rolling.
In equipment such as typewriters, cashiers and recorders, there are ink rollers that supply ink to the surface of the movable type. This kind of roller has communicating pores on the roller body, and the holes contain ink. When in use, the roller keeps contacting with the movable type surface, so that the equipment can operate normally. The manufacturing method of this kind of ink roller is to add a foaming agent to the rubber compound, and then vulcanize it in the mold, or mix the salt with the rubber compound, and then extract the salt after vulcanization in the mold. . It can also be combined in two ways.
2.papermaking rubber roller
A large number of rubber rollers are used in Fourdrinier paper machines and circular paper machines used in the paper industry. Different parts of the paper machine are equipped with rubber rollers for different purposes. A large Fourdrinier machine needs more than 70 rubber rollers.
A volt roller is installed on the wire part of the paper machine, and the hardness of its rubber layer is more appropriate to control the hardness of 30-35 Shao A. Excessive hardness will cause poor contact between the flat roller and the garden net, affect the wet paper sheet to lift off the net, and also produce pressure stains. If the hardness of the rubber layer of the flat roller is too low, the squeezing effect on the wet paper will be small, resulting in the disadvantage of high moisture in the wet paper.
The press part of the paper machine is equipped with a dehydration press roll, a vacuum press roll, a groove press roll, a net press roll, a guide blanket roll, and a tight blanket roll. The dewatering press roll is the most important rubber roll on the paper machine, and its main purpose is to remove moisture from the wet pulp. The hardness of the press roll is usually 80-90 Shao A degrees, and the highest hardness is above 98 Shao A degrees. It is a quartz rubber roller made of quartz sand in the rubber. The hardness of the press roll is increased correspondingly with the continuous increase of the pressure of each press line. During operation, the squeezing dewatering rubber roller will produce certain deformation or bend. In order to make the pressure on the pulp uniform, the rubber layer at the bend must produce a certain degree of deflection and creep.
In order to improve the pressing and dewatering effect of the rubber rollers, a grooved rubber roller has emerged. The grooved rubber rollers are used for pressing and dehydration without too much linear pressure. At present, the fourdrinier paper machine at home and abroad has generally used the grooved rubber roller to press. A good dehydration effect was obtained.
Post time: Jun-17-2021