| 摘要 |
PCT No. PCT/JP96/02986 Sec. 371 Date Mar. 31, 1998 Sec. 102(e) Date Mar. 31, 1998 PCT Filed Oct. 15, 1996 PCT Pub. No. WO97/14628 PCT Pub. Date Apr. 24, 1997A plastic film or sheet, wherein upon immersing a test piece of the plastic film or sheet in ultrapure water, extracting pure water from near the surface of the test piece and evaluating the cleanliness of a resulting bag based on the concentration (number) of fine particles 0.3 mu m or greater in size dispersed in the extracted ultrapure water, the measured concentration is no greater than 5 per ml. The process comprises steps of immersing and running a plastic film or sheet (1) in ultrapure water (4) in a clean room (16), and further spraying and washing the film or sheet (1) with ultrapure water after the film or sheet (1) is drawn out, followed by drying, destaticization, cutting and heat sealing.
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