Chemistry of pulp and paper making . Fio. 51. Mullen Tester. Fig. 52. District of Columbia Paper Tester 4o6 PAPER TESTING t^pe, in which the paper is clamped against a rubber diaphragm,through which the pressure is applied to a circular area of thepaper measuring one square inch. The Mullen tester, Fig. 51,and the District of Columbia paper tester. Fig. 52, are of thehydrauKc type. The second type of bursting strength apparatusis of the spring operated metal plunger design, in which thepaper is clamped between annular rings, through which a springoperated plunger is forced. The Ashcroft tester
Chemistry of pulp and paper making . Fio. 51. Mullen Tester. Fig. 52. District of Columbia Paper Tester 4o6 PAPER TESTING t^pe, in which the paper is clamped against a rubber diaphragm,through which the pressure is applied to a circular area of thepaper measuring one square inch. The Mullen tester, Fig. 51,and the District of Columbia paper tester. Fig. 52, are of thehydrauKc type. The second type of bursting strength apparatusis of the spring operated metal plunger design, in which thepaper is clamped between annular rings, through which a springoperated plunger is forced. The Ashcroft tester, Fig. 53, is theonly one of the above type now on the market.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1920
