Recycling of Polymers | Recycling of waste from polymers

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. .

Milan Tomic

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