During the manufacturing process of PET Preform that is blow moulding method, it can easily get stress and strain distribution on their platform or side wall. Such type of errors can turn into serious issues in the final bottle structure. It can have disturbed design or generate a case of misbalancing and fall off. To detect these defective issues, the preform structures are analysed using Polariscope strain viewer. The equipment is fitted with two standardized lamps under which these defects are clearly visualized. The light sources include monochromatic light, sodium lamp. It is based on the principle of if the preform contains stress defect the refractive index passing it will change its path and will generate a pattern. The defect patterns can be compared with the preform defect chart having all the patterns. The charts are standardized and can help in the assessment of the issue. Get Polariscope in Pune with all the latest features.
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