| 摘要 |
A machine for forming perforations on a continuous length of heavy foil (130), the machine using two substantially identical perforation rollers (101, 102) each with individualized cooperating male and female dies (111, 112) and operating with film having an input speed and output speed substantially identical to that of the circumference of the rollers so as to allow for the perforation function to be accomplished independently of the film drive function. This produces a resultant film having a pattern of holes (132) therein which have edges in compression without weaknesses due to any torque produced by the rollers. |
