Testing Method for the Elongation of Paper and Paperboard

The test required for the improvement of JIS P 8132 was carried out. The result was as follows.1) No significant difference of the elongation was observed between testing with the initial load or (initial strain) and without it. The initial load, therefore, could not be given to the specimen in testing the elongation of paper and paperboard, if the specimen is set on the clamp of the apparatus carefully.2) The method of correction was investigated considering the mechanism of measuring the elongation with the constant rate of elongation apparatus. The correction is performed by looking over the strain of the loadcell and chuck under testing the standard specimen of metal with this apparatus.