Extrusion & Post
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LLDPE extrusion material changeover gel
Problem Phenomenon
A large amount of gel particles appears after changing from LDPE to LLDPE.
Cause Analysis
Large viscosity difference between the two materials, residual material retention and stratification; incomplete cleaning.
Solution
①Gradient temperature cleaning; ②extend purging time; ③disassemble and clean the die head when necessary; ④record the material changeover SOP.
Key Takeaway
Material changeovers with large viscosity differences require thorough purging.
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