Testing cases and housings esp. of watch - subjecting sample batch to predetermined pressure for short time and measuring tension release in set periods

摘要

Deformation of a few samples are registered by a measuring system according to the ISO standard 2281 and stored. The measuring time and intervals are measured in a second stage. Samples of a batch to be tested are then subjected to the stipulated pressure for a short time. The release of tension of the deformation is measured in the predetermined time intervals. As soon as a too large a deviation from the housing graded as good can be detected a judgement can be delivered to categorise as of unsatisfactory quality without the need to carry out a complete testing process. USE/ADVANTAGE - Quality testing of sealing against high and low air pressure conditions. Time and cost saved, making suitable for quality control on prodn. line.