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plastics - Coggle Diagram

- - - - Agglutination: The material is compacted and then incorporated into other materials
      - Extrusion: we melt the material, and then it's extruded into long filaments
      - Floating: we wash the plastics and then dry them by centrifugal force
      - Pelletising: The filaments are then reduced to granules that we call pellets
      - Separation and crushing: we separate the plastics according to type and then they' re crushed.
- - - - Using this, we can produce different finishes (glossy, matt or textured). This depends on the outer coating applied by the final cylinder.
      - Used to: worktops, to cover surfaces of kitchen cupboards and drawers.
      - Thermoplastic produced by extrusion is passed through some hot cylinders to make sheets of varying thickness.
    - - We use plastic sheets with a large surface for this technique.
        
        We put thermoplastic 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 is 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
        
        Used to form: bathtubs, dashbnards, shop signs and egg boxes
    - - This one has four stages:
        
        We put thermoplastic (granular form) into a heated cylinder
        
        We apply pressure with a large, rotating screw, which
        forces the melted material out through a nuzzle.
        
        We solidify the shaped material slowly in a refrigerated water bath.
        
        Finally, we collect the lastic through a feeder system.
        
        Used to: wrapping, lining for electric cables, tubes and pipes.
    - - There are three principal techniques:
        
        Blow moulding: We put a tubular-shaped piece of plastic into a hollow mould which has the shape of the object that we want to make. We close the mould and blow pressurised air into it, so that the plastic adheres 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 plastic, which can be in granular form, into the base of a cavity mould. The outer part of the cavity mould, shaped the same, is closed to compress the material inside. We then heat it and it becomes soft and maleable .The plastic adapts to the shape of the cavity between the two parts of the mould. We extract the oblect when the plastic has cooled and solidified.
        
        Injection: We inject melted thermoplastic into a mould. When the material has cooled and solidified, we extract it from the mould.