A rubber internal mixer is a heavy duty batch mixer designed and made for mixing raw rubber with ingredients in rubber compound preparation.
Typically rubber internal mixers consist of a completely enclosed mixing chamber in which two rotors operate. A very large cylinder, referred to as a RAM/Hopper, is assembled on top of the chamber and moves up and down in order to apply high pressure on the batch. The RAM movement can be either Hydraulic or Pneumatic and supplemental valves and regulators enable lowering the air pressure in the main chamber. The Feed hopper receives the materials for mixing and there is also a discharge door and drive system.
The rotor bodies are made of special alloy cast steel shrunk onto forged steel shafts, thus forming one integral component. The rotors are designed with inner circuits of steam or water for cooling and heating. The leading edges of the rotors are protected by hard-weld materials. Each rotor revolves in opposite directions and at slightly different speeds, thereby keeping the rubber batch in constant circulation. They pull material down into the mixing chamber and the ridge between the two chamber sections helps to force mixing.
The acute convergence of the rotors with the chamber walls, impart a shearing action. This intensive working produces a highly homogeneous mix. The air-operated RAM in the feeding neck confines the rubber batch within the sphere of mixing chamber.
At every tire plant, internal mixer performance is key to the reliable production of tires. In the technical rubber industry, the quality of mixing is very important as the mixers have to a cover wide range of compound types at difference hardness levels and a wide range of base polymers and so forth.
At Pelmar you can find a wide range of rubber internal mixers with different volume ranges, starting from lab size through 90 Litters up to 350 L, with 2-, 4- or 6-wing rotors. We have both tangential and intermix mixers, the most common models being K7, F-160, PX-270, F-270, F-370, 11D, 15D and GK-160. We will be able to deliver the machine on an ‘as is’ condition or fully-reconditioned according to client requirements. We can change and upgrade the control system to advanced models according to customer’s specifications. For more information, Contact Us still today to learn more about what we can offer.
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