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Plastics Pilar - Coggle Diagram

- - - - 2.3 Elastomers Made by vulcanisation: mixing sulphur and rubber, and heating to 160 degrees.They are hard, resistant and vey elastic-streching easily under
        force
- - - - 1.1 Origin and transformation of plastics
        
        Depending on their origin,we can describe plastics as natural or
        synthetic:
        
        Natural plastics: directly from vegetables they are raw materials
        examples:cellulose or latex.
        Synthetic Plastics: are made from compounds extracted from petroleum,natural gas and carbon. The majority of plastics belong to this group.
        
        1.2 Properties of plastics
        
        Depend on their composition Streght,eslasticity,rigidity and flexibility are characteristics of many plastics, although they vary from one type to another. However, there ara other properties that are commo0n to the majority of plastics: mechanical: malleability, ductility, mechanical resistance.acoustic: acoutic insulation.electrical: electrical insulation.thermal: thermal insulation other properties**:low density
        impermeability.
        
        1.3 Ecological properties
        
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- - - - 3.1 .Extursion This technique has four stages: 1. We put thermoplatic, in granular form, into a previously heated cylinder. 2.We apply preassure by means of a lare, rotating screw, wich forces the melted material out, though a nozzle. 3. We cool the shaped material slowly in a refrigerated water bath until it's solid. 4. Finally we collect the pieces of plastic through a feeder system. Extrusion
        
        3.2 Lamination Thermoplastic prduced by the extrusion method is passed througha series of hot cylinders to produce sheets of varying thickness. With this technique, we can produce different finishes. Lamination
        
        3.3 Vacuum formig We use sheet with a large surface for this technique. technique.
        
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