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76
Design Course
Designing of Plastic Products for Injection Moulding
Manufacturing Methods and Technologies
by
Masking
Masking is a technique used to cover, hide or mask certain areas on plastic parts before painting. It is a complicated and labor intensive process. There must be a tight tolerance between mask and stencils to prevent leakage. Masks and stencils must be cleaned periodically for a good fit. There must be sufficient number of masks for an operation to avoid any interruption due to cleaning.
Masking considerations
- Try to simplify the masking process if can’t be avoided.
- Avoid transition between masked and painted feature like fillet or irregular surfaces.
- Allow at least 1/8 inch between masked area and part edge.
- Avoid thin masking.
