The extruding properties of several kinds of rubber

 

　　The extruding process is used to press out the cylinder wall and the screw part of the machine, so that the glue can be extruded and preliminarily designed, and the extrusion process also becomes the extrusion process.

　　The main equipment of extruding process is extruder.

　　The extruding properties of several kinds of rubber: the pressure of natural rubber is fast and the shrinkage of semi-finished product is small. Body temperature of 50-60 ℃, Rubber Parts starting from 70-80 ℃, mouth 80-90 ℃; Styrene-butadiene rubber pressure out of the slow, shrinkage deformation, surface roughness, the body temperature of 50-70 ℃, the nose temperature 70-80 ℃, the mouth temperature 100-105 ℃; Neoprene delivery without sufficient heat, body temperature 50 ℃, ℃ the nose, Custom Mold Rubber Parts mouth type 70 ℃; Ethylene propylene rubber extrusion speed, small shrinkage rate, body temperature of 60-70 ℃, the nose temperature 80-130 ℃, Rubber Seal mouth, 90-140 ℃. The butyronitrile rubber has poor performance and should be fully heated when pressed. Body temperature of 50-60 ℃, the nose temperature 70-80 ℃.

The compressional properties of several common rubber

 

　　The natural rubber heat shaping is large, the shrinkage rate is small, the pressure is easy, easy to adhere to the hot roller, should control each roll temperature difference, so that the film can transfer smoothly; Styrene butadiene rubber has a small thermal plasticity, and the shrinkage rate is large, Rubber O-Ring so the rubber that is used for pressing is to be fully plasticized.

　　Due to the obvious effect of styrene butadiene rubber, the temperature of the rolling temperature should be lower than that of natural rubber. Neoprene in 75-95 ℃ is easy sticky roller, Rubber Gasket difficult to rolling, should be used at low temperature or high temperature, rolling to rapidly cooling, mixed with paraffin wax, stearic acid, can reduce the sticking phenomenon; It can be operated continuously in a wide range of temperature, with a large shrinkage of the rubber material when the temperature is too low. Small NBR thermoplastic property, shrinkage, the kind of adding filler or rubber softener can reduce shrinkage rate, when the filler weight accounted for more than 50% by weight of the raw rubber, Rubber Seal can obtain the smooth surface film, nitrile rubber viscosity a little cold roll.

　　Before rolling, need to pre processing of rubber and fabric, prior to entering rubber calender, the need to put on a thermal refining machine before it turns, Custom Mold Rubber Parts the technology for cooking or preheat, the purpose is to improve the rubber mixing uniformity, Rubber Parts and further increase the plasticity, raise the temperature, increase the plasticity. In order to improve the adhesion of rubber and the fabric performance, ensure the quality of calender, the need for fabric drying, moisture content control in 1-2%, moisture content is low, fabric harden and calender easy damage, high water content, poor adhesion.