When it comes to the disposal of theplasticone cannot fail to mention the process ofseparation. It starts right from our homes to continue, on a large scale, in the factories involved inrecycling.
Thereseparation of plastic, at home, it's pretty simple, in the trash canplasticall kinds of plastic wrappers and containers should be thrown away, bulky plastic objects such as toys or flexible plastics such as toothpaste tubes should not be placed. On an industrial level, theseparation of plasticit is a cornerstone of the recycling process.
To provide for theseparation of plasticdifferent machines are used, in any case, human labor is never lacking. The most common criteria for the separation of plasticthey foresee a first mechanical selection where the discriminating factor is the size of the plastics, a second separationwhere the selection is made by particular optical readers and the discriminating factor is the type of plastic.
At first it separates thePET plasticfromPVC plastic exploiting the different specific weights of the materials. Traditionally, polyethylene terephthalate (PET) is separated from polyvinyl chloride (PVC) thanks to the use of tanks with particular solutions. In the presence of large quantities of light plastics, the separation involves a first section in which the lighter products (high and low density polythene, propylene, polystyrene and expanded polyurethane) are separated from the heavier plastics.
To proceed with therecycling of plasticit is not always necessary to make a selection. We are talking aboutheterogeneous recyclingwhen the processing involves various materials containing PE, PP, PS, PVC, high and low density PE films as well as PP films, tanks or trays, cans ... In this context the classicPET plasticit can also be present in minimal quantities.
In this process the plastics are not selected from each other, the only separation necessary is that which excludes any extraneous products that could cause problems in the processing phase, so the separation is performed with morphological and dimensional criteria and a mild separation occurs. by a magnetic to eliminate any metals or other foreign materials.