Dynamic strength tester for paper cores
First Claim
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1. An apparatus for testing dynamic strength of a sample paper core, comprising:
- a motor;
a driving element rotatably driven by the motor about a rotational axis, the driving element being adapted to coaxially engage an inner surface of the sample paper core such that rotation of the driving element causes rotation of the sample paper core about a longitudinal axis thereof;
a variable-tension belt assembly including an endless flexible belt adapted to be wrapped partially around an outer surface of the sample paper core, and an actuator adapted to apply tension to the belt so as to impart a load on the sample paper core; and
a controller adapted to control the actuator for controlling the tension of the belt.
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Abstract
A testing apparatus for determining dynamic strength of sample paper cores includes a rotatably driven pneumatic chuck for engaging the inner surface of a sample core to rotatably drive the sample core, and a variable-tension belt assembly having a flexible belt which is looped over the sample core and tensioned to simulate the load applied to a paper core in actual use. The belt is tensioned by a pneumatic cylinder which is controlled under feedback control by a servo valve and a computer controller so that the load applied to the sample core accurately tracks a predetermined desired load schedule versus time.
17 Citations
22 Claims
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1. An apparatus for testing dynamic strength of a sample paper core, comprising:
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a motor; a driving element rotatably driven by the motor about a rotational axis, the driving element being adapted to coaxially engage an inner surface of the sample paper core such that rotation of the driving element causes rotation of the sample paper core about a longitudinal axis thereof; a variable-tension belt assembly including an endless flexible belt adapted to be wrapped partially around an outer surface of the sample paper core, and an actuator adapted to apply tension to the belt so as to impart a load on the sample paper core; and a controller adapted to control the actuator for controlling the tension of the belt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of testing dynamic strength of a sample paper core, comprising:
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supporting the sample paper core on a rotatable driving element which engages an inner surface of the sample paper core such that rotation of the driving element causes rotation of the sample paper core about a longitudinal axis thereof; applying a load to the sample paper core via an endless flexible belt which is partially looped around an outer surface of the sample paper core and tensioned; and rotatably driving the driving element and sample paper core while the load is applied thereto. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification