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PLASTICS, image, image, image, image, image, image, image, image, image,…

- - - - Are obtained directly from raw vegetable materials.
        
        For example, cellulose or latex
    - - Are made from compounds extracted from petroleum, natural gas and carbon
        
        The majority of plastics belong to this group
- - - - Chemical recycling
        
        We apply chemical processes to make new materials from the original components of plastics residues.
      - Mechanical recycling
        
        We make new products from plastic granules
        
        The process has five stages
        
        Separation and crushing
        
        Floating
        
        Agglutination
        
        Extrusion
        
        Pelletising
      - Energetic recycling
        
        We can incinerate plastics and the energy that is produced is used
        in industry, for heating or producing electnctty.
- - - - They are made up of weakly formed molecular chais
        
        When we hit then they become softer
        
        The hiting and cooling process can be repeted many times
  - - - They are forme by strongly-linked chains running in different directions
        
        When heated, they become soft and can be shaped.
  - - - They are hard, resistant and very elastic
        
        They are made by chains linked laterally and the folded over themselves
- - - - We put thermoplastic into a previously heated cylinder
      - We apply pressure by means of a large, rotattng screw, which forces
        the melted materinal out, through a nuzzle.
      - We cool the shaped material slowly In a refrigerated water bath until
        lt's solid.
      - Finally, we collect the pieces of plastic through a feeder system.
  - - - With this technique, we can produce different finishes
        
        This depends on the outer coating applied by the
        final cylinder
  - - - We put themoplastic into a mould
      - We then use a heater to heat the mould and soften the plastic.
      - We extract the air below the sheet so that the plastic ts pulled against
        the inside walls of the shaped mould, and the desired form is created
      - We leave the mould to cool, then remove the obiect
  - - - Injection
        
        We inject melted thermoplastic into a mould
        
        When the material has cooled and slidified, we extract it from the mould.
      - Blow moulding
        
        We put a tubular-shaped piece of plastic into a hollow mould which
        space or cavity inside has the same shape as the oblect that we want to make
        
        We close the mould and blow pressurised air into it, so that the plastic adreres to the sides of the mould and takes its shape.
        
        When the object is cold, we remove it from the mould.
      - Compression
        
        We put thermostable plastics into the base of a cavity mould.
        
        The oter part of the cavity mould is closed to compress the material inside.
        
        Then we hit it and it becomes soft and malleable
        
        The platic adapts to the shape of the cavity between the two parts of the mould
        
        We extract the object when the plastic has cooled and solidified