PET Preform while their manufacturing process which is blow moulding technique, can exhibit stresses and strain defects on their base or wall. Such defects can lead to issues in the final bottle production with disturbed appearance or imbalance issues. To inspect these defects the preform samples are tested under Polariscope strain viewer. The machine is equipped with two standard light sources 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 is standardized and can help in assessment of the issue. Get Polariscope in Bangalore with all the latest features.
.jpg)
