PVC Compounding

• Rigid PVC for fittings/connections
  It is best to use PVC composite granules in the injection moulding process of fittings. You can add a higher proportion of CaCO3. some customers only use pre-mixed powders on the injection moulding machine, which have poor dispersion and shape quality.
  There is no filter and an eccentric pelletizer is required.
  Powerful cooling required on single screw extruders
  Basic formulation:
  PVC + 5-15% CaCO3 + heat stabiliser + impact modifier + lubricating wax + pigment
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Polyvinyl chloride is the third most widely produced synthetic plastic polymer after polyethylene and polypropylene. It is produced by polymerising vinyl chloride monomer (VCM).
The relatively low cost of PVC, its biological and chemical resistance and its processability make it widely used in a variety of applications. Plasticised PVC is commonly used as insulation and sheathing for cables.
Basic formulation:
PVC 60% + DOP 20% + Calcined clay 10-20% + CaCO3 0-10% + Heat stabiliser + Additives

Window profile scrap can be recycled. The various profile scraps are pre-mixed with a small amount of virgin PVC powder, components to provide impact resistance, colours and stabilisers and fed into the first drum. Subsequently, the other filling materials (wood fibre or CaCO3) are fed into the barrel via a side feeder.
The granules do not have to be made, they are cooled on a conveyor and then crushed into powder.
Basic recipe:
PVC scrap 40% + virgin PVC powder 10% + wood fibre 20% + CaCO3 20% + additive