Chemistry of pulp and paper making . Fig. 51. Mullen Tester. Fig. 52. District of Columbia Tester 4o6 PAPER TESTING type, in which the paper is clamped against a rubber diaphragm,through which the pressure is appHed 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 thehydraulic 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 teste
Chemistry of pulp and paper making . Fig. 51. Mullen Tester. Fig. 52. District of Columbia Tester 4o6 PAPER TESTING type, in which the paper is clamped against a rubber diaphragm,through which the pressure is appHed 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 thehydraulic 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, bookpublishernewyo, bookyear1920
