Extrusion & Post
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PET sheet inter-roll bank
Problem Phenomenon
Orange-peel-like water marks appear on the sheet surface; poor smoothness and uneven calendering
Cause Analysis
When the material flowing out of the die enters the calender rolls without an inter-roll bank, the sheet passes through without being compacted, and the surface shows orange-peel-like water marks; insufficient bank or uneven rotation is the main cause
Solution
① Maintain a bank visible to the naked eye between the calender rolls with uniform rotation; ② adjust the roll gap to match the speed; ③ stabilize extrusion output to prevent bank fluctuations; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The inter-roll bank is the compaction guarantee of PET calendering; without a bank, water marks are inevitable; uniform bank rotation is the operator's visual standard; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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