Molds & Tooling
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High fiber content product filling difficulty
Problem Phenomenon
LGFPP with fiber content >40% has extremely poor flowability, and thin-wall products cannot be filled completely
Cause Analysis
Fibers form a physical network structure restricting PP molecular chain movement; friction resistance between fibers greatly increases the apparent viscosity of the system; fibers hinder melt flow in the cavity
Solution
Appropriately increase the processing temperature to improve flowability (not exceeding the degradation temperature of 240°C); add processing aids to reduce inter-fiber friction; reduce fiber content to 30-35% or shorten fiber length
Key Takeaway
Fiber content and processing flowability conflict with each other within a certain range and need to be balanced
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