In brief
Registration error in multilayer roll printing can accumulate through feed, printing, drying and rewind. Measure it across the web and through the run, not from one cut sample.
Film can expand or contract under tension and heat; stencil position, mark detection and indexing introduce further variation
Film can expand or contract under tension and heat; stencil position, mark detection and indexing introduce further variation. Map registration error at several positions and across roll length to distinguish fixed offset, cyclic error and progressive drift.
LICHAO equipment provides optical mark tracking and states 0
LICHAO equipment provides optical mark tracking and states 0.1 mm repeat overprint accuracy. Tracking references printed marks, but it cannot erase web deformation, drying shrinkage or unstable upstream marks. The customer artwork still requires a full trial.
Sample at the beginning, middle and end of a roll and across the web width
Sample at the beginning, middle and end of a roll and across the web width. Log layer-to-layer error, film temperature, tension, speed and restart behavior. For multilayer conductors or decoration, recheck after lamination and die cutting.
Send film type and thickness, roll diameter, image width, mark design, layer count, allowed error and curing conditions
Send film type and thickness, roll diameter, image width, mark design, layer count, allowed error and curing conditions. Only then can rated machine precision be compared with achievable process capability.
How do we start a trial?
Provide substrate, controlled artwork, material data, process flow and acceptance criteria. Use representative samples to confirm configuration and process window.
References and fact sources
Original process guidance. Verify equipment fit and performance with customer samples.
Mr. Yang can discuss a trial plan from your film, drawing and acceptance requirements.
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