Paper and board. Measurement of water contact angle by optical methods
Paper and board. Measurement of water contact angle by optical methods
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What is ISO/TS 14778 about?
ISO/TS 14778 is a standard that serves the technical specifications for the measurement of the water contact angle using the optical method that facilitates the evaluation of wettability, surface energy and interaction with different liquids for paper and board. ISO/TS 14778 specifies the method for optical assessment of the contact angle between water and the surface of paper and board, where the process of droplet formation, application to planar substrates or measurement of the droplet shape in contact with the solid is performed by automated equipment. ISO/TS 14778 defines instrumental capabilities which show the limits of measurement. The instrumental capabilities use a digital image capturing system operating at a minimum of 50 frames per second and ne the ability to perform the first measurement after no more than 20 ms to 40 ms contact between the droplet and substrate.
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