Method of perforating film

Details Method of perforating film Method of perforating film

1995-08-11

1997-12-16

Jones, Eugenia

Cutting

Processes

83 30, 83 48, 83 52, 83 769, 83620, 83948, 396661, 234 1, B26D 520

Patent

active

056972733

ABSTRACT:
A method for making perforations in a continuous film which is thereafter cut into individual filmstrips having variable lengths. A die set unit of the perforator has a plurality of punches and corresponding dies which are respectively arranged along the continuous film. The die set unit performs die-punching N times (N=1, 2, 3 . . . ) in every first section having a variable length Lx, and the measuring feeder transports the continuous film by a first length after each of (N-1) times die-punching and by a second length after the last die-punching for every first section. The first length is given as Lx/N, and the second length corresponds to the first length plus the length L2 of a second section disposed alternately with the first section along the continuous film. In alternative, the die set unit is constituted of first to nth die sets aligned in order from downstream to in the film transporting direction. The ith die set of the die sets has a number Gi (i=1, 2, . . . n) of punches as a segment of the total punches. The first to ith die sets are simultaneously activated to perform die-punching. The number is selected depending on the number F of frame exposure locations to be provided in each individual filmstrip.

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