PET Bottle Manufacturers are facing difficulties in meeting client requirements with their increasing demands. The first and foremost demand is regarded as the quality and durability of the containers. It has been found that if the quality of PET material is poor, or there are some inaccurate steps taken in the process, the product manufactured is of low quality and do not sustain longer. They generate cracks or experience imbalance on placing on a platform. They may break or twist on exposing to temperature changes etc. The reason behind such changes is the weakening of the material during their production process which is blow moulding.

The blow-moulding process involves several steps that introduce rapid heating and cooling of the material. Due to this process, the material generates strain and stress distribution on its surface or around the corners. These strains are the indicators of flaws or defects generated in the preform structures but they are not visible to naked eyes which is why it is important to perform Strain Inspection in Preform Structures using Polariscope Strain Viewer.

The Strain is produced due to the inaccurate manufacturing process or incorrect steps taken by the producers. Every strain has their own identity. Each and every strain exhibit their own shape and colour variation. It is very difficult to detect these defects without applying any professional and precise testing method. The test equipment used for this method is qualified to detect every possible type of defects, strain or stress distributions occurring in preform structures. The machine is a deluxe model and is equipped with a standardized test template area. The test stage or platform has a specified size of engraved space in the shape of preform structures.

For conduction Strain Inspection in Preform Structures, the specimen must be kept on that engraved structure. The test platform is designed as per the globally acclaimed test standards, which is for a precision based test, it is important that the preform is placed properly on the engraved space. The specimen is placed at a specified angle under the light source. CFL and sodium light is used for strain detection. The machine is good to go with a standardized preform defect chart which contains the patterns of different types of stress or strain distribution along with their causative reason. So that user can understand exactly what implementation can improve the quality and reduce the chances of such flaws.