Processing Machinery
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PMMA Advertising Light Box
Problem Phenomenon
Light box panels yellow and deform after several years outdoors
Cause Analysis
High temperature inside the light box plus outdoor ultraviolet causes ordinary sheets to age and deform; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Choose UV-resistant sheets for outdoor light boxes; design light box heat dissipation; leave expansion gaps when fixing panels; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Outdoor light boxes require weather-resistant sheets plus heat dissipation and expansion design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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