| abstract |
A HIGHLY CLEAN PLASTIC FILM OR SHEET(L), WHEREIN UPON IMMERSING A TEST PIECE(22)OF THE PLASTIC FILM OR SHEET(L)IN ULTRAPURE WATER(4), EXTRACTING PURE WATER FROM NEAR THE SURFACE OF THE TEST PIECE(22)AND EVALUATING THE CLEANLINESS OF A RESULTING BAG BASED ON THE CONCENTRATION (NUMBER) OF FINE PARTICLES 0.3 F.1M OR GREATER IN SIZE DISPERSED IN THE EXTRACTED ULTRAPURE WATER(4), THE MEASURED CONCENTRATION IS NO GREATER THAN 5 PER M1. THE PROCESS FOR PRODUCING IT COMPRISES STEPS OF IMMERSING AND RUNNING A PLASTIC FILM OR SHEET(L)IN ULTRAPURE WATER(4) IN A CLEAN ROOM(16), AND FURTHER SPRAYING AND WASHING THE FILM OR SHEET WITH ULTRAPURE WATER(4)AFTER THE FILM OR SHEET(L) IS DRAWN OUT, FOLLOWED BY DRYING, DESTATICIZATION, CUTTING AND HEAT SEALING. |