Volume-16 (04/2007)
In-line process control with MobileDrop: Monitoring cleaning performance on glass surfaces
In in-line processing quality assurance is usually carried out rapidly and on-site. Contact angle measuring for monitoring cleaning stages places special demands on the measuring technique: the instrument must be mobile and measure non-destructively. MobileDrop offers the necessary flexibility. In contrast, with a stationary laboratory instrument the optimal process parameters and the action limits for quality assurance can be determined. Using the example of contact angle measurements with MobileDrop and the DSA100 on unassembled glass panes for double glazing we can demonstrate the smooth integration of the contact angle measuring method into planning and the production sequence.
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Practical contact angle measurement (1) With care to accuracy:
preparations and general conditions for contact angle measurements
This is the first of a series of articles on practical contact angle measurement. In this and the following issues of the Surface Science Newsletter we will cover a wide range of topics concerning drop shape analysis: from preparations for the measurement through drop deposition conditions and up to the choice of the methods used for analyzing the drop shape and calculating the surface free energy.
This first installment answers questions about the correct handling of the samples and test liquids as well as suitable ambient conditions.
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Teeth in good shape
Contact angle measurements on impression materials by 3M ESPE AG
In order to achieve a good fit and adhesion for dentures, hydrophilic impression materials are required so that good wetting occurs in the naturally wet place of use. Messrs. 3M ESPE carries out contact angle measurements with the KRÜSS DSA10 instruments and studies the hydrophilic behavior of denture impression materials. The main focus of the study project was on the variation with time, as the hydrophilic properties of the freshly formed surface are of primary importance for processing. In a comparison between silicone-based polymers and polyethers the advantages of the intrinsically hydrophilic polyethers were evident.
Read the complete text Hydrophilicity of Precision Impression Materials During Working Time (PDF) - we would like to thank Dr. Thomas Klettke of 3M ESPE AG for permission to present this article in our Newsletter.
- Drop Shape Analysis System DSA10