Processing Polymers
- Created by: TomT254
- Created on: 31-01-16 12:50
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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.
- Process
- 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.
- Process
- 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.
- Process
- Extrusion
- Calendering
- Injection Moulding
- 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.
- Process
- Compression Moulding
- Thermoplastics
- 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
- Process
- Line Bending
- Thermoplastics
- Joining Processes
- Thermoplastics
- Screw Fixing
- Integral Snap Fixing
- Captive Nuts
- Adhesives
- Thermal Welding
- Ultrasonic Welding
- Thermosets
- Screw Fixing
- Adhesives
- Thermoplastics
- Moulding Processes
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