Injection Molding
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Incomplete color clearing when switching color masterbatch
Problem Phenomenon
After color change, the previous color still remains after multiple injections
Cause Analysis
Previous color material remains in the screw and barrel; accumulated material in dead zones is not completely removed; purging time is insufficient
Solution
Use high-viscosity purging material of the same matrix for color change; the temperature-difference purging method of heating up then cooling down; disassemble the screw and nozzle for thorough cleaning if necessary
Key Takeaway
Thorough color change is necessary for multi-variety small-batch production
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