Short span tensile tester system
OwnerBote G. Bruinsmainventor
Life of this patent
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Abstract
A short span tensile tester for testing a sheet such as a paper web is provided with two pairs of clamping jaws mounted in adjacent clamping relation, to clamp a portion of sheet material therebetween, one pair of jaws being pivotably mounted to swing under gravity into contacting relation with the other pair of jaws, to define a minimal span of up to about 3 m.m. A wedging device forces displacement of the jaws in the plane of the web to rupture the web, and force measuring means measure the wedge reaction force and hence the web rupture strength.
Claims6
Testing apparatus for testing the tensile strength of a web of sheet material, having two pairs of clamping jaws in adjacent clamping relation for clamping adjoining portions of sheet material over a minimal zero gauge length, force applying wedge means to force one pair of jaws away from the other pair of jaws to cause rupture of the web, and force measuring means to measure the force required to rupture the web, one said pair of jaws comprising opposed first and second jaw portions, spring means extending between said first and second jaw portions to position them in mutual resiliently spaced relation, said spring means having substantially a single degree of freedom, to retain said jaws in predetermined self indexing relation.
Dependencies are inferred from the claim text.