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Products  > Testing Machines Inc. Bendtsen/Sheffield Roughness Model 58-29

Testing Machines Inc. Bendtsen/Sheffield Roughness Model 58-29

Measure the roughness of a paper surface with a reliable and easy to use Bendtsen Roughness and Sheffield Smoothness tester. Includes a touch screen display and microprocessor control unit. 


Testing the smoothness of paper

Receive accurate results when testing paper roughness and smoothness with the Bendtsen/Sheffield Roughness Model 58-29 from Testing Machines Inc. This reliable test and inspection machine is designed to offer testing for both Bendtsen and Sheffield testing methods, allowing you to choose the solution most suitable smoothness testing solution for you needs.  

When ordering, you can choose the measurement heads that suit your testing plans whether that’s the Bendtsen, Sheffield or both.  

A robust surface roughness measurement instrument

Our Messmer Buchel model 58-29 Bendtsen/Sheffield combination unit incorporates a modern, contemporary look with robust mechanical design and improved electronics, ensuring a long-lasting solution for your testing needs. It has a TFT color touch-screen display with an easy-to-operate application program. Its user-friendly interface is also available in a range of languages. Along with our 58-29 unit, we also offer our 58-27 Bendtsen Porosity Tester.

The importance of accurate paper smoothness results

Surface roughness is directly related to a variety of paper end uses and is an essential part of the QA process. Achieving and monitoring desirable print and coating quality are critical to producing a smooth sheet of paper. You can find out more about the common variable in testing smoothness in our guide to roughness/smoothness testers. 

The Bendtsen method for surface roughness measurement

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. 

The Sheffield method for surface roughness measurement 

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 of 47.7 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. 

Meeting smoothness testing industry standards

Our Bendtsen Roughness and Sheffield Smoothness tester has also been designed to help to test to a number of important industry standards, including ISO 8791-2, ISO 8791-3, ISO 5636-3, TAPPI T 538, TAPPI T 547, helping you ensure that your process is meeting the required benchmarks.   

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The Problem

Proper calibration of your inspection devices is essential for a long and accurate life of service. A leading pet food manufacturer discovered this when shoddy servicing created a raft of problems with their burst and creep testing equipment.  

Our experts quickly identified and rectified the pre-existing problems. Now, they’re delighted to rely upon a trusted test and inspection partner with Industrial Physics.   

Scott Chambers, Quality Technician at Mars Inc., said,

“I was very happy to be one of the first companies to participate in the mobile calibration program. Ryan Moreno was my technician and was very personable, knowledgeable, and accommodating. The calibrations he performed were very efficient. I like having a technician on site one on one to answer any question I had. Also, not having to ship my BT-Integra units was a major plus. looking forward to future visits at Mars Petcare KKC.”

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