Recycling of Polymers :
 |
| recycling |
Recycling
is the process of making or manufacturing new products from a product that has
originally served its purpose.
Recycling
of plastics should be carried in such a manner to minimize the pollution level
during the process and as a result to enhance the efficiency of the process and
conserve the energy.Plastics recycling technologies have been historically
divided into two general types:
i.
Primary
ii.
Secondary
Primary recycling
involves processing of a waste/scrap into a product with characteristics
similar to those of original product.
Secondary recycling
involves processing of waste/scrap plastics into materials that have
characteristics different from those of original plastics product.
Stages of Recycling of Polymers:
1) Inspection Workers
inspect the plastic trash for contaminants like rock and glass, and for
plastics that the plant cannot recycle.
2) Chopping and Washing The
plastic is washed and chopped into flakes.
3) Flotation Tank If mixed
plastics are being recycled, they are sorted in a flotation tank, where some
types of plastic sink and others float.
4)
Drying The plastic flakes are dried in a tumble dryer.
5. Melting
The dried flakes are fed into an extruder, where heat and pressure melt the
plastic. Different types of plastics melt at different temperatures.
6). Filtering
The molten plastic is forced through a fine screen to remove any
contaminants that slipped through the washing process. The molten plastic is
then formed into strands.
7). Pelletizing The strands are cooled in
water, then chopped into uniform pellets. Manufacturing companies buy the
plastic pellets from recyclers to make new products.
Advantages:✅
i.
Lower labor costs.
ii. Lower transportation costs, hand or ox carts often being
used.
iii. Innovative use of scrap
machinery often leads to low entry costs for processing or manufacture.
iv.
Existing culture of reuse and recycling, & collection of these materials.
Dis-Advantages:❌
i. Cost: “May not be economical to recycle small quantities of
plastics.
ii. Training of waste generators will be required, so they can separate
the wastes properly. .
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