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PLASTICS (2 CLASIFICATION OF PLASTICS (2.1 THERMOPLASTICS (We manufacture…

- - - - This thechnique has four stage
        
        1.We put thermoplastic, in granular form, Into a previously heated cylinder
        
        2.We apply pressure by means of a large, rotattng screw, whtch forces
        the melted matenal out, through a nozzle
        
        We cool the shaped material slowly In a refngerated water bath untili t's solid.
        
        Finally, we collect the pieces of plastic through a feeder system.
    - - Thermoplastic produced by the extrusion method ls passed through a senes of hot cylinders to produce sheets of varying thickness
        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 use plastic sheets with a large surface for this technique
        
        We put thermoplasttc into a mould
        
        2 We then use a heater to heat the mould and often the plastic
        
        3 we extractthe air below the sheet so that the plastic is pulled againstthe insade walls of the shaped mould and the desired form is created
        
        4 We leave the mould to cool, then remove the object
    - - There are three pnnctpal techniques:
        
        compresssion
        
        blow molding
        
        injection
- - - - Soldering
      - Adhesives
    - - Mechanical fasteners