Features

Defects invisible to the naked eyes such as crystallization or other common defects become visible;

When the plastic preform is placed on the Polarizer at 0° or 90° , the colored birefringent stripes at the edge of the preform can be observed;

When the plastic preform is placed on the polarizer at 45°, black birefringence stripes in the central part of the preform will be displayed;

4.  in addition to white light, Sodium light is also used to test colored preforms or finished bottles;

5. Besides, this Strain Viewer provides 12 kinds of defect analysis functions.  

12 kinds of colored defect comparison pictures will be attached to instruct related improvements in preform production process.