Painting On Plastics

PAINTING ON PLASTICS

Self coloured plastics are used The following are used

1. Colour compounding

2. Process colouring

3. Dry colouring - Pigments

4. Masterbatch

5. Liquid colouring

SURFACE COLOURING PROCESSES

Sandwich moulding  two colour

Spray Painting  Surface pretreatment and polishing may be required

Costly painting booths are required Colourants/Masterbatches should not be used

SURFACE COLOURING PROCESSES

Sandwich moulding  two colour

Spray Painting  Surface pretreatment and polishing may be required

Costly painting booths are required Colourants/Masterbatches should not be used

SPRAY PAINTING

Process can be automated using robots

The use of paint can on the other hand have an important drawback. It is often observed that a paint and/or primer on a ductile plastic results in a brittle fracture during impact loading, whereas the unpainted part tested under the same conditions deforms in a ductile manner. The paint layer can result in a 40-fold reduction of the fracture energy, especially when too rigid a paint is used. On loading of the part, the brittle paint fractures first and this crack may propagate through the substrate.