Please enable JavaScript.

Coggle requires JavaScript to display documents.

PLASTICS (Classification of plastics (Thermoplastics (We manufacture…

- - - - These plastics are made from compounds derived from petroleum ,they are formed by strongly-linked chains running in different directions
- - - - Thermoplastic produced by the extrusion method ls passed through a series of hot cylinders to produce sheets of varying thikness.
      - With this technique, we can produce different finishes, for example,glossy,matt or textured. this depends on the outer coating applied by the final cylinder
    - - We put thermoplasttc into a mould
      - We then use a heater to heat the mould and soften the plasuc
      - 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
  - - - We inject melted thermoplastic into a mould ,When the material has cooled and solidified, we extract tt from the
        mould
    - - We put a tubular-shaped piece of plastic into a hollow mould which has the same shape as 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
    - - 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 teh same,is closed to compress the material inside.we then heat it and it becomes moldeable
      - 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
- - - - Natural plastics are obtained directly from raw vegetable matenals,for example, cellulose or latex, or from animal proteins.
      - Shynthetic plastics are made from compounds extracted from petroleum,natural gasand carbon.the majority of plastics belong to this group
- - - - We apply chemical processes to make new
        matenals from the original components of plastic residues.
    - - Separation and crushing
      - Floating
      - Agglutination
      - Extrusion
      - Pelletising
    - - We can incinerate plastics and the energy that
        is produced is used tn industry