Polariscope is used to view the internal material stresses and material flow characteristics of PET preforms and containers. This is ideal for laboratory use and at-the-line preform and bottle inspection
Defects in preform can be easily detected by using this equipment. When a preform is held parallel to viewing field colour pattern is seen known as isochromatic fringe. This indicates magnitude of the stresses introduced during moulding process. When a preform is held 45 deg to viewing field a coloured pattern known as isoclinic is seen, this indicates direction of stresses.
‘TBG’ Polariscope is used in the preform assembly to check the possible defect in the preforms. Take the precautions at the early stage would help a lot in cost cutting and time-saving. A defect chart is provided to understand these defects.
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