Project Report on Recycling Of Tyres

By the application of heat and chemical agents followed by intense mechanical working to ground vulcanised scrap or worn out rubber tires, tubes and waste rubber articles, a substantial regeneration on devulcanisation of the rubber compound to its original plastic state is effected, thus permitting the product to be compounded, processed and revulcanised. Reclaiming is essentially depolymerisation and misnomerically called "devulcanisation"  although combined sulphur is not removed.   By this  depolymerisation,  the  reclaimed  rubber  shows  decreased resistance  to deformation at ordinary temperature; thus  loosing its  elastic  nature and become less  resistant  to  compression, stretching  or  swelling.  Reclaimed rubber was  born  because  a secondary  source of rubber was urgently needed. Entire rubber industry was growing so fast in the early days and there was  no enough  crude rubber to substantiate the demand. Reclaim  rubber soon become indispensable.  Apart from this, tire pose a disposal problem and therefore utilized as basic raw material in the form of ground vulcanised waste (crumb rubber) or converted  to reusable state-reclaimed rubber. Because of short break-down and mixing time, the power consumption during break-down and  mixing, low  temperature  required  in calendering  and  extrusion,  non-critical calendering  temperature penetration  to  fabric,  tack improvement, minimising sulphur bloom, forming of uncurved stock, low  swelling  and shrinkage on extrusion  and  calendering,  low thermoplasticity, high rate of cure and cheaper rubber/filler are important  considerations  in  the  mind  of  the compounder in deciding  upon  regular  use of reclaim  for  low  cost,  energy, conservation  and  efficient  processing  steps  even  with   new generation polymers to achieve desired optimum properties.