Rubber Machinery / Rubber Processing Machines

Rubber processing machines offered by us comprise wide range of equipment and machinery that is used in an industrial environment. The working of different machines is given as follows:

Rubber Mixing Mills:

• In mill mixing, elastomer is first added to nip (Gap between two rolls) that is open to about 6mm, at top of the rolls
• A band of elastomer passes through nip and is formed around the front roll
• Depending on elastomer used, varying degrees of difficulty can be encountered in forming band initially
• However, after few passes, a band will be formed that can be fed back into nip continuously
• Elastomer is then cut back and forth twice to assure proper blending as well s allow elastomer in bank to go through nip
• All dry ingredients, except fillers and cure system are then added to nip
• Compound is then cut back and forth twice to assure good dispersion of these dry ingredients throughout the batch

The next steps involves:

• Opening mill slightly and adding fillers slowly to batch that prevents excessive loading of fillers at centre of roll several times during this operation and thrown back into bank
• When most of fillers are mixed into compound, liquid plasticizers and rest of fillers are added
• With filler visible, batch is cut back & forth twice more to assure good distribution of fillers
• 'PIG'' roll batch & feed ''Pigs'' back into nip at right- angles as part of cross-blending process
• Next step is to open mill more and add vulcanizing agents to batch
• When vulcanizing agents are well distributed, entire batch is cut back & forth at least five times to assure thorough cross-blending, before being sheeted off mill

Calander Machine Process :

• Calandering is efficient process for producing flat rubber sheets as well as for frictioning, lamination, coating & embossing operation
• These machines are similar to rubber mill where rubber and other components pass between two/ more metal rolls
• To produce product of controlled thickness, significantly higher pressure is required, hence calander rolls, journals and frames are more carefully designed and constructed

Rubber Extruders Process:

The extruders have two main functions - to pump rubber compounds through barrel and to generate enough pressure in process to force material through die to give required cross-sectional shape. The process includes

• Compound, usually in form of strip being fed at controlled rate into extruder
• This imparts heat and some distributive mixing moves material along machine and generates necessary pressure
• After leaving die, product is cured, cooled, cut to length & packaged or coiled for transport to customers