Method of testing cores

Details Method of testing cores Method of testing cores

1988-09-08

1990-07-24

Noland, Tom

Measuring and testing

Hardness

By penetrator or indentor

73866, G01N 1900

Patent

active

049427695

ABSTRACT:
The loading capacity of a core manufactured by reeling and gluing from paper or board layers, is tested by dynamically loading the core under conditions that simulate real life conditions. The core is mounted on a chuck, and the method is practiced by loading the core by utilizing a roll that exerts a nip pressure, and by rotating the core. One or both of the loading and the speed of rotation of the core are changed over time in a predetermined manner, to simulate the real life conditions. For example the loading on the core can be increased constantly while the rotational speed is kept constant, or the rotational speed is increased and the loading decreased corresponding to the real use situation caused by unwinding of a paper roll which is mounted by the core. The method also includes detecting any changes in the structure of the core, either optically, by sensing vibrational changes, or by sensing the break of an electrical wire passing through the core. Loading is continued until the core breaks. One or both of the rotational speed of the core and the force loading of the core are sensed at the moment of change, and/or the time elapsed until the moment of change is detected. A sleeve may be provided on the core to contact the roll, the sleeve protecting the surface of the core and distributing the loading caused by the roll contact, to a wider area.

REFERENCES:
patent: 3593573 (1971-07-01), Ely
patent: 3858442 (1975-01-01), Nozaki
patent: 3992928 (1976-11-01), Thoms
patent: 4799382 (1989-01-01), Sprunt et al.
patent: 4807465 (1989-02-01), Botzolakis et al.
"Measurement of Contact Stress Distribution Roll Load and Roll Torque During Cold Strip Rolling", 12-14, Jan. 1982, vol. 1, pp. 98-116; by F. Al-Selihi; (source publication name missing but apparently German) in 73/824.

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