Abstract: A 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.

Abstract: Disclosed is a fish processing system having endless conveying means, a plurality of chuck units provided on the conveying means and adapted to cramp fish bodies, head separating means provided at a point on the path of travel of the fish bodies and adapted to separate head portion from the fish and guts removing means adapted to remove guts from the fish bodies.