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US 5,672,828 AGranted
Strength determination of sheet materials by utrasonic testing
AssigneeAmcor Limited
InventorRussell J. Allan
Life of this patent
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Abstract
A method of determining strength and related mechanical properties of paper and similar products, both on-line and off-line using a continuous ultrasonic swept frequency wave transmission and reception system. The invention also provides an apparatus for measuring the strength and related mechanical properties of paper.
Claims13
A method of measuring strength characteristics and related properties in a sheet product including the steps of:
- (a) providing a continuous sonic swept frequency wave within the sheet product;
- (b) receiving the continuous sonic swept frequency wave;
- (c) taking measurements in order to ascertain the time the wave takes to reach the receive after transmission and determining the strength characteristics and related properties from said measurements.
An apparatus for measuring strength characteristics and related properties in a sheet including:
- (a) means to transmit a continuous sonic swept frequency wave within the sheet product;
- (b) means to receive the continuous sonic swept frequency wave;
- and
- (c) means for taking measurements in order to ascertain the time the wave takes to reach the receiver after transmission so as to determine the strength characteristics and related properties.
1 more element
Dependencies are inferred from the claim text.