We are looking to solve a problem, which keeps on recurring on an on-and-off basis in our RX surfacing proces: after deblocking surfaced and polished lenses, quality control encounters spots on 1.5 and 1.6 plastic lenses. Most days start off without any problems, however, some days these spots occur from the very first run and create quality problems from the first minute onwards. On this particular surfacing line we employ LOH PRA blockers with alloy (47C) at 55° C, LOH V100 cutting machines and LOH TORO polishers. Measures already tried: lowering the alloy temperature, lowering the blocker cooling fluid temperature, replacing the alloy, calibrating the cutting machines and thoroughly cleaning and replacing cylinders of the polishing devices. Still no real result. Any ideas or thoughts? Thanks.
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