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Thin film provides pressure readings

A Sensor Products product story
Edited by the Engineeringtalk editorial team Apr 30, 2008

Futek used Pressurex to help redesign several of its clamps to incorporate silicone die springs to regulate the pressure more precisely.

Pressurex, a thin flexible film from Sensor Products , is a versatile NDT tool for quality control and machine component inspection.

Its ability to easily and rapidly show inconsistencies in surface pressure between mating or contacting surfaces has lowered scrap rate and assisted in the design and manufacture of many industrial and electronic products.

Futek, a US manufacturer and supplier of load cells, torque and pressure sensors, experienced difficulty assembling some of their load cells to its specifications.

By performing several tests and controlling for different variables, they found fluctuations in clamping pressure to be a significant factor.

Futek's sensors incorporate metal foil strain gauge technology.

The adhesive they use to bond the gauges to their sensors requires a clamping pressure of 3.4-5bar.

However, by using Pressurex, James Meiselbach, a Mechanical Engineer at Futek, was able to see that the pressure fluctuated from 3.4bar to over 14bar in some of its production runs.

This discovery led Futek to use Pressurex to help redesign several of its clamps to incorporate silicone die springs to regulate the pressure more precisely.

"A sample pack of Pressurex with film that revealed different surface pressure ranges allowed our production to continue", said Meiselbach.

No training or instrumentation is required.

It allows users to assess surface contact inconsistencies in virtually any industrial or electronic application, including gaskets, clamps, bolted joints, connectors, heat sinks, heat sealing elements, welding heads and plastic and composite manufacture.

Meiselbach found using Pressurex to be a simple procedure.

To measure the surface pressure of a clamp around the outside of a load cell, he cut Pressurex in the configuration of the clamp surface area, placed it in between the clamp and the load cell, applied force, unclamped it and removed the Pressurex.

He then compared the film, which changes colour depending on how much pressure is exerted, to an accompanying colour calibration chart.

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