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Tensile strength and elongation of paper are affected by (1) specimen length, (2) specimen width, (3) edge effects, (4) temperature and humidity, and (5) speed of testing. This paper deals with the effect of speed of testing only. The kinds of paper included in the present test program, Table I, were chosen because they are subjected to tensile forces at various speeds of application during their periods of usefulness. In these five papers, tensile strength and elongation are important factors in predicting performance. All tests were performed on a Thwing-Albert Model 49RC Electro-Hydraulic Tensile Strength Tester. Specimens were cut individually on a precision sample cutter 1 in. wide. Specimen length was 8 in. between grips. Jaw surfaces were 1.25 in. wide by 1 in. deep; the stationary jaw was smooth and the other serrated. Traverse time of recorder pen for full scale deflection to balance was 2.4 sec. Table II lists average tensile strengths of 10 specimens at operating speeds of 0.1, 0.2, 0.5, 1.0 and 2.0 in. per min in both machine and cross-machine directions.
Green, Ralph E.
Instrument Engineer, Thwing-Albert Instrument Co., Philadelphia, Pa.