罐詰用ブリキ板の厚さの不均一性に就て

Abstract

Accuracy of the measurement of the vacuity of full cans by the elastic deflexion of their ends is greatly affected by the irregularity of the thickness of the tinplate, (1) therefore the authors have made this experiment to know of what grade the irregularity of the thickness of the tinplate of present-day home product is. With a dial thickness gauge four kinds of tinplate, (1) black annealed plate, (2) coldrolled plate, (3) finished tinplate 95 lb. base and (4) 100 lb. base, were measured of their thickness at every point 2 cm. apart lengthwise and breadthwise as shown in Fig. 1 (a). Partial distribution of irregularity of the thickness of each one sheet and irregularity of the thickness between sheets of the same kind were calculated from the measurements and the results are as follows : both irregularities above stated are equally about 2% for blackplate and coldrolled plate and about 1% for both finished tinplates of 95 lb. and 100 lb. base as shown in Table 1.