| 摘要 |
Apparatus for testing the burst strength of a line of perforations in a sheet of paper. The testing apparatus comprises a first means fixedly mounted in a frame for gripping a sheet of paper on one side of a line of perforations extending across the paper and a second means rotatably mounted in the frame in spaced relation to the first means for gripping the paper on the other side of the line of perforations. A pendulum is attached to the second means so that swinging of the pendulum causes rotation of the second means. The pendulum may be swung along a path which extends from a first position, where energy is stored in the pendulum, through a second position, where the paper is rendered taut and the line of perforations is burst by the energy stored in the pendulum, to a third position, where the energy remaining in the pendulum after the bursting action is dissipated. An indicating means is provided which is actuated by the pendulum for indicating the amount of energy remaining in the pendulum after the bursting action. An apparatus is also provided for providing various different lines of perforations in a paper sample for use in the testing apparatus.
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