Paper Number 7.3
Correlated
Dual Sheet-of-Light Measurement
of Preparation Material
Tobias Meyer
Günther Kostka
Andreas Jobst
Fraunhofer Institute for Integrated Circuits
Dept. Contactless Test and Measurement Systems
Am Wolfsmantel 33
91096 Erlangen, Germany
Email: oliver.scholz@iis.fraunhofer.de
Voice: +49 (0) 9131 772-7242
Fax: +49 (0)
9131 776-7299
In tire production preparation materials of
various widths are required. These materials are produced at the manufacturer's
plant from a drum of material with a standard width by cutting sheets of the
required width, and splicing them together after rotating the sheets by 90
degrees. The resulting material is an endless drum of preparation material with
the proper width required for a specific tire type.
The properties of this splice are critical for
the subsequent tire production process. Automatic measurement and evaluation of
the splice across the entire material width is desirable along with automatic
detection of a variety of standard defects, like e.g. dog ears. This
information can be used to ensure consistent quality of the preparation
material while at the same time lowering production cost, partly because
operator intervention is only required for critical faults.
In this paper an approach is described
consisting of a dual correlated sheet-of-light measurement setup, using a
standard PC for automatic evaluation. Two calibrated sheet-of-light cameras are
used to measure the material simultaneously from the top and bottom on the machine
producing the spliced material before the material is wound on a drum. The
result of the image processing operations is a continuous surface data stream
of top and bottom surfaces, allowing the measurement of the material thickness
as well as precise measurement of the splice. The data is also suitable for
detection of other material flaws not related to the splice.
We will also present information about the use
of this setup at a major tire manufacturer's plant over an extended period of
time, including measurement data, accuracies and experiences with this new
approach to measurement of preparation materials for tire production.