Spray Moulding with RAKU-PUR - The manufacturing process for multi-layer components

Designing with RAKU-PUR. Spray moulding is used for reinforcing of deep drawn components. Our polyurethane (PUR) materials show high impact strength and fast curing. Spray moulding also offers many advantages for the production of lightweight and rugged plastic components. It shows low material consumption, easy and fast production of complete geometries as well as low waste. Furthermore RAMPF Giessharze offers food-genuine versions.

1. Construction of an open mould

2. The first spraying: Creation of the compact outer skin

  • The application of the material can be done using either a high or low
    pressure process
  • The material is ideally sprayed using a robot technology
  • The sprayed skin has an optically beautiful, very smooth surface
  • Easy to clean
  • Food safe
  • Light-stability is adjustable
  • The curing takes place in less than 1 minute
  • The layer thickness is between 1 – 2 mm

3. The second spraying: mechanical strengthening of the outer skin

  • The application of the strengthening layer can be done in a low or
    high pressure process
  • Simultaneous spraying of fibreglass or natural fibres is possible
  • The material also doesn’t drip when spraying on vertical surfaces
  • The high impact resistance of the material ensures the protection
    of the outer sprayed skin
  • The curing is finished in less than 1 minute
  • The layer thickness is between 5 – 15 mm

4. Optional: The backfilling with rigid foam

  • The material can be foamed into the closed mould using a high pressure
    mixing-head
  • This ensures high mechanical stability, good heat insulation and an ideal,
    light-weight construction
  • The rigid foam has an excellent adhesion to the previous layers

5. Demoulding or deflashing the component

Efficient and highly flexible process for the production of complex large components

Example of uses:

  • Bonnet and other complex equipment for instance the shaft inliners, strengthening of deep drawn components such as bath tubs, light-weight components in a sandwich structure for refrigerated trucks or caravans

More information

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