Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1991-04-18
1993-01-26
Raevis, Robert
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 308
Patent
active
051814242
ABSTRACT:
An apparatus for testing the tear strength of a tear strip in a paperboard blank. The blank is placed on and clamped to the apparatus, the latter having a force gauge mounted on it. One end of a flexible wire has a clip fastener which is attached to the end of the pull tab in the paperboard blank. The other end of the flexible wire is attached to the force gauge, the gauge measuring the amount of force required to rip the tear strip from the surrounding paperboard blank. In one embodiment of the invention, a motor is mounted on the apparatus and pulls the force gauge, the flexible wire passing around a pulley mounted on the apparatus and leading to the clip fastener. In another embodiment, the flexible wire passes over several pulleys, one of which is secured to a travelling, non-rotating nut. The nut is carried by a threaded rod rotatably journaled in the frame. A motor is coupled to the rod to rotate it, thereby pulling on the clip fastener upon movement of the nut.
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Martin James E.
Robison Richard G.
International Paper Company
Raevis Robert
Zielinski Walt Thomas
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