Raw rubber is elastic and lacks the plasticity necessary for processing, so it is not easy to process. In order to improve its plasticity, it is necessary to plasticize the raw rubber, so that the coordination agent can be easily dispersed in the raw rubber in mixing process. Meanwhile, in the rolling and forming process, it is also helpful to improve the permeability of the rubber into the fabric and the forming fluidity. The process of degrading the long chain molecules of raw rubber into plasticity is called plasticizing.

There are two kinds of plastic refining methods: mechanical plastic refining and thermoplastic refining. Mechanical plasticizing is a process in which long chain molecules are degraded to a shorter state from a high elastic state to a malleable state under the action of mechanical extrusion and friction force of the plasticizer at a moderate temperature. Thermoplasticizing is the process of injecting hot compressed air into the rubber, which degrades long chains of molecules and shortens them under the action of heat and oxygen to obtain plasticity.

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