Bendtsen Roughness and Sheffield Smoothness instruments measure the roughness of a paper surface. Surface roughness is directly related to a variety of paper end uses. Achieving and monitoring desirable print and coating quality are critical to producing a smooth sheet of paper.
Description
Specifications
Documents
The Bendtsen method measures the mean air flow between an enclosed metal land and a paper specimen. The metal land has a length of 100 mm (± 0.5 mm) and a width of 0.15 mm (± 0.002 mm). The weight of the complete test head is 267 (± 2 grams) creating a test pressure on the specimen of 100 kPa (at 1.47 kPa air supply pressure). A glass plate is used to support the test sample. During a Sheffield test, a sheet of paper is placed on a flat glass plate. A measurement head set to a constant pressure of 9.85 kPa is placed on the sheet. The head is then fitted with a stainless-steel ring with a diameter of47.7 mm which is placed on top of the specimen. The instrument measures the continuous volume of air leaking around the stainless-steel ring. The air-flow volume is converted from SCCM-Standard Cubic Centimeters to SU-Sheffield units. Approximately 7 SCCM equals 1 SU. The Messmer Buchel model 58-29 Bendtsen/Sheffield combination unit incorporates a modern, contemporary look with robust mechanical design and improved electronics. The instrument uses a TFT color touch-screen display with an easy-to-operate application program for a user-friendly interface.
Measurement range 20–5000 ml/min ( 3-500 SU):
7.0 inch Color Touch Screen:
Bendtsen – Test measuring head mass 267 ± 2 grams:
Sheffield – Test measuring head mass 1.640 ± 0.005 kg:
Measurement range 20–5000 ml/min ( 3-500 SU):
7.0 inch Color Touch Screen:
Bendtsen – Test measuring head mass 267 ± 2 grams:
Sheffield – Test measuring head mass 1.640 ± 0.005 kg:
