Processing Polymers

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  • Processing Polymers
    • Moulding Processes
      • Thermoplastics
        • Injection Moulding
          • Process
            • 1.Plastics granules placed in hopper with any other additive (colouring)
            • 2.Screw gets rotated by motor and gearbox which forces the polymer to the heaters where it is softened
            • 3. Hydraulic ram forces softened polymer into the mould (pressure from ram ensures cavity is filled)
            • 4.Polymer is left to cool and solidify, mould halves open and ejector pins push the product from the mould.
            • 5. Process is ready to be started again.
        • Blow Moulding
          • Process
            • 1.Parison is extruded downwards
            • 2. Mould halves close trapping the end of the parison, sealing it.
            • 3. Hot air blows into parison forcing it out to follow shape of the mould.
            • 4. Mould cools polymer allowing it to be released.
            • 5. Mould halves are opened and product is extracted.
        • Rotational Moulding
          • Process
            • 1.Moulds opened and loaded with the exact weight of the polymer.
            • 2. Mould halves are clamped together and rotated about the arm spindle.
            • 3.Whole arm is rotated towards a heated chamber where polymer is heated (whilst continually rotating).
            • 4. Chamber and polymer cool and product can be removed.
        • Extrusion
        • Calendering
      • Thermosets
        • Compression Moulding
          • Process
            • 1.Preformed slug (compressed powder) is placed between two halves of the mould.
            • 2. Mould is heated to a temp that allows cross links tow form within the material.
            • 3.Mould is closed and the pressure forces out any excess material.
            • 4. Mould is opened and product can be ejected while its still hot.
    • Forming Processes
      • Thermoplastics
        • Vacuum Forming
        • Thermo Forming
          • Process
            • Sheet material is heated to just above its softening point
            • It is held securely in a frame between the two mould halves
            • Mould halves close and vacuum is applied through lower mould
            • Upper mould ensure detail is added
        • Line Bending
    • Joining Processes
      • Thermoplastics
        • Screw Fixing
        • Integral Snap Fixing
        • Captive Nuts
        • Adhesives
        • Thermal Welding
        • Ultrasonic Welding
      • Thermosets
        • Screw Fixing
        • Adhesives


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