Molds & Tooling
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TPE Hardness Range
Problem Phenomenon
TPE product hardness selection is difficult; shrinkage differences of different hardnesses in the same mold cause dimension problems
Cause Analysis
The TPE hardness range is extremely wide from Shore A0 to Shore D50; higher hardness means smaller shrinkage and higher processing temperature; ultra-soft TPE has much filling oil and is prone to stickiness; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Select the hardness grade according to application requirements; ②Precisely calculate the mold shrinkage allowance by hardness; ③Pay attention to the stickiness risk of ultra-soft TPE; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The wide hardness range of TPE is where design flexibility lies; the stickiness risk of ultra-soft material requires formulation management; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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