Method for assembling photographic film and photographic film cassette

A method of manufacturing a photographic film cassette, said method comprising the steps of:

• providing a pair of shell halves which comprise a cassette shell, each of said pair of shell halves of said cassette shell having confining elements formed on an inner periphery of said cassette shell, and a film passage mouth formed between said shell halves
• providing a spool which is rotatably mounted in said cassette shell
• providing a pair of flexible flanges and mounting said pair of flexible flanges on opposite ends of said spool;
• inserting said spool inside said shell halves in a lighted environment with said flanges mounted to said spool so that said confining members press said flanges at circumferential portions thereof;
• mating said shell halves together to form said cassette shell;
• separating said shell halves in an unlighted environment to widen said film passage mouth to an extent that said confining elements still press said flanges at said circumferential portions thereof;
• providing a length of photographic film having a trailing end and a leading end, and inserting said trailing end of a strip of said photographic film through said widened film passage mouth toward said spool;
• securing said trailing end of said photographic film to said spool;
• subsequently mating said shell halves together again;
• winding said photographic film into said cassette shell by rotating said spool in a winding direction so that a roll of photographic film is tightly wound on said spool;
• and
• pressing said flexible flanges, using said confining members against planar end surfaces of said photographic film roll, such that said flexible flanges deform while pressing said roll, to prevent loosening of said roll.