Recycling of Waste Plastic Using Extrusion Process

Mechanical Engineering

The main aim of this work is to reduce the plastic waste that is rising in the present world and to achieve this; a system is designed and fabricated incorporating a plastic extruder which plays a prominent part in recycling waste plastic into useful products. This study uses waste plastics and converts them into useful product with the help of an extruder, thereby reducing the plastic waste which is a key factor for environmental pollution. Presently waste plastics are effectively converted into useful materials like coatings of wire pipe, bricks, interlocks, roof tiles, railway sleepers, paving slabs, retaining blocks etc., using either single origin plastic waste material or a mixture of different plastic wastes along with waste rubber powder as filler. The waste plastics are used to convert it into pellets or powder and this act as raw material. The conversion takes place by forming a homogeneous molten mass in the extruder and forcing it under pressure through an extrusion die orifice that defines the shape of the products cross section. The formed material, or extrudate, is cooled and drawn away from the die exit at a controlled rate. The extrudate can then be wound on a spool, cut to a specified length, or directed into another in-line process.

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