Chemistry of pulp and paper making . imately H in.)wide by 180 mm. long (approximately 7t\ ins.), is clamped ateach end and the clamps are moved apart until the strip isbroken. A suitable device indicates the pull in kilograms (ap-proximately lbs.) required to break the strip. It is recom-mended that the load in kilograms per 15 mm. width strip, beconverted into pounds per inch of width by the followingformula: () X (Tensile strength in kg. per 15 mm. width)= Tensile strength in lbs. per i in. width. A tensile strength factor may be determined by the following formula: (Tensile strengt
Chemistry of pulp and paper making . imately H in.)wide by 180 mm. long (approximately 7t\ ins.), is clamped ateach end and the clamps are moved apart until the strip isbroken. A suitable device indicates the pull in kilograms (ap-proximately lbs.) required to break the strip. It is recom-mended that the load in kilograms per 15 mm. width strip, beconverted into pounds per inch of width by the followingformula: () X (Tensile strength in kg. per 15 mm. width)= Tensile strength in lbs. per i in. width. A tensile strength factor may be determined by the following formula: (Tensile strength in lbs. per i in. width\Weight 25 X 40,500 / = Tensile strength factor. The usual factor for tensile strength is known as the breakinglength. This is the length of a strip which, if suspended atone end, would break of its own weight. The following formulamay be used to determine the breaking length of a sample: 404 PAPER TESTING (Tensile strength per i in. width) X (13,889)(Weight of a sheet 25 X 40,500)= Breaking length in Fig. so. Schoppee Tensile MAcraNE Stretch. The amount of elongation at the instant of ruptureof a strip of paper under tension is measured on the Schoppertensile strength machine. The result is figured as a per cent ofthe total original length. Bursting Strength. There are two general types of apparatusused to determine bursting strength. One is of the hydraulic TENSILE STRENGTH 405
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1920
