Material Drying
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TPE Drying 0.1% Red Line
Problem Phenomenon
TPE products show bubbles and silver streaks, transparent parts show cloudiness, and the appearance is unqualified
Cause Analysis
TPE has low but non-zero hygroscopicity, absorbing moisture and low-molecular volatiles during storage and transportation; residual moisture vaporizes in the 180-220℃ melt to form bubbles and silver streaks; 0.1% moisture in transparent parts causes visible cloudiness
Solution
①Dehumidifying drying at 80-100℃×2-4 hours until moisture content <0.1%; ②Strictly control transparent parts at 0.1%; ③The hopper dryer continuously maintains heat to prevent moisture regain
Key Takeaway
TPE drying is the guarantee of appearance quality; the 0.1% red line plus the heat-preserving hopper keeps moisture defects out before injection; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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