Thin sensor measures interface force distribution

Circuit World

ISSN: 0305-6120

Article publication date: 1 March 2000




(2000), "Thin sensor measures interface force distribution", Circuit World, Vol. 26 No. 1.



Emerald Group Publishing Limited

Copyright © 2000, MCB UP Limited

Thin sensor measures interface force distribution

Thin sensor measures interface force distribution

Keywords SPI, Sensors

Sensor Products Inc. has introduced Pressurex®, a tactile force indicating sensor film. The sensor is useful in assessing compression magnitude and distribution between any two mating or impacting surfaces. Applications exist for both manufacturing process control and machine/component inspection and calibration.

Pressurex sensor film comes in the form of a large thin sheet, actually a film, physically similar to this page. When placed in between impacting or mating surfaces, the sensor film instantaneously and permanently changes color. The intensity of this color is proportional to the amount of force applied, allowing the user to actually quantify the stress characteristics across the surface. Precise PSI (kg/cm2) can be determined by comparison of the sensor film to a color calibration chart (conceptually similar to interpreting litmus paper), or by using one of several imaging systems that Sensor Products supplies.

Pressurex technology is a valuable aid in R&D and QC/QA in electronic packaging. Determining pressure distribution within a laminating press for multilayer printed circuit boards and revealing uneven pressure distribution across the nip of rollers on a dry film laminator are just some of the applications. The film is also useful in detecting imperfections within the nips themselves. When manufacturing hybrid circuits, the sensor film reveals inconsistencies in resistor thickness across large area substrates. Uniformity problems are clearly revealed during thermocompression in the TAB process and designing heat sinks. Additional uses include pressure determination during the stack insertion process in transducer manufacturing, core pressure in wound electrolytic capacitors, and the lamination process of ceramic capacitors.

For more information or to obtain a free product sample, please contact Bill Ebner. Tel: +1 973-884-1755; E-mail:

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