What is mastication of rubber in two roll rubber mixing mill?
Rubber compounding means incorporating rubber ingredients into a rubber mixture so it is evenly dispersed, then the rubber mixture is called a rubber compound. The mill aids in two main steps of rubber processing mastication and mixing. Mastication is when the raw polymer is sheared and the broken down to create an easier flow. This allows for better incorporation of materials, which leads to the mixing component, when the other materials for a compound are added.
To create a rubber compound on a mill, first a raw polymer, or base polymer, is needed. The polymer can be a number of things, including natural rubber, such as of SMR CV, SMR 20, SMR L or a variety of synthetic rubbers such as nitrile (NBR), ethylene propylene diene monomer(EPDM), butyl, polycholorprene (CR), Polyisoprene (IR) and others.
The raw rubber after being masticated, in which normally for natural rubber, other ingredients needed to be compounded into the raw polymer either on a mixing Banbury Kneader or other rubber mixing machine then pass to two roll mill for dispersion and sheeting out for rubber compound that is suitable for molding dimension. Rubbing compounding also can be mixed on two roll mill by sequentially adding the ingredient and fold, cut and roll the rubber to mix. This process create rubber that can be used to create products.
Ingredients added to make a rubber compound include oils, fillers and accelerator, which usually includes sulfur or peroxide and may also include a metal oxide either as activator such as zinc oxide ,in some cases as filler and also as activator. After mixing, a compound is removed from the mill in a large sheet, and then molded into its desired product .
