What is the manufacturing process of plastic?
Manufacture of plastic:
Manufacture of Plastic can now be done from cellulose, starch or natural gas, but the majority of plastics are still made from petroleum products. Light on the different stages of plastic manufacturing.
1.Naphtha, the basic ingredient of plastic
Naphtha is aof from of that condenses between 40 and 180 ° C. It is the material of . Before being used by plasturgists, the naphtha must undergo a cracking operation.
Under the effect of heating (800 ° C) and then a sudden cooling (400 ° C), largeof that make up the naphtha are being fragmented and more easily exploitable molecules.
Theobtained after cracking contain from 2 to 7 of each. Through so-called addition reactions (chain of identical monomers) or (chain of different monomers), they bind together to form .
At the outlet of the refinery, theare in the form of granules, liquids or powders. The different plastic materials we know are obtained thanks to the addition of additives and additives. They are then shaped by molding, extrusion, injection or by thermoforming.
5.Recycling of plastic waste:
After use and collection, plasticis sent to treatment plants for pre-washing and sorting. They are then ground into flakes, washed, rinsed, dewatered, dried, sieved and regenerated into granules.
It should be noted that the calorific value ofequivalent to that of or . Thus, a significant proportion of currently undergoing chain .
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