Test preform defects with Polariscope strain viewer NXG

Test preform defects with Polariscope strain viewer NXG

Polariscope strain viewer NXG

Preforms are the intermediate products used in the manufacturing of PET bottles, which are widely used in the beverage industry. Preforms are typically made by injection molding, and they are shaped like test tubes with threaded necks. While manufacturing these preforms, manufacturers will face several defects like strains, cracks, or marks present in them. Detecting these defects early on will help manufacturers in ensuring that quality products will be delivered.

Thus, we at Presto have designed a high-quality lab testing instrument known as the Polariscope strain viewer NXGThis is one of the high-quality lab testing instruments that is based on the principle that any change in refractive index is due to different strain distributions and this leads to lower transparency of the material.

This laboratory testing equipment will detect the types of defects early on and ensure that customers will get a quality product. Besides this, PET & Preform manufacturers can also detect internal defects in the preforms, such as air bubbles, inclusions, and voids, which can weaken the material and affect the quality of the final product. In this blog, we are going to discuss brief information about the Presto Polariscope strain viewer for PET and the advanced features that make this testing instrument unique.

Analyze all types of defects present in preforms with Presto Polariscope strain viewer

As we have discussed above, preforms are typically stretched during the manufacturing process, which can result in orientation patterns that can be visualized using a Polariscope. Other defects like cracks, strains, and internal defects can affect the quality of these preforms.

Thus, to analyze even the minor defects in your PET products, we at Presto have designed high-quality lab testing equipment known as Polariscope strain viewer NXG. This advanced version of the traditional Polariscope strain viewer instrument is specifically designed for testing PET preforms. It uses polarized light to visualize the birefringent patterns and stress distribution in the preforms and is used to detect defects and stress patterns that can affect the quality and performance of the final product.

The NXG model of Polariscope Strain Viewer has been embedded with a different set of features that includes a Sharper and clearer optical viewing experience. Besides this, it has been offered with two light intensities that include monochromatic light and Sodium Lamp.

Standard Template is also been provided for viewing samples at 45º and 90º angles. A High-resolution Touch Screen with auto-detection of angles is one of the features that makes it stand out among other similar products in the market. The product offers great value for money with its accuracy in providing consistent testing results.

Now, let us discuss the advanced features of this quality testing instrument.

Features of Polariscope strain viewer NXG

The Polariscope Strain Viewer NXG is used to analyze the orientation of the PET molecules in the preforms, which can be an indicator of the mechanical properties of the material. By analyzing the orientation patterns, the preforms can be optimized for specific applications, such as high-pressure bottling or stretch blow molding.

Now, you can easily detect any defects in your PET products with the help of this quality testing equipment.

Below, we have listed the features of this testing instrument:

  • Sharper and clearer optical viewing experience.
  • Two light intensities are offered: monochromatic light and Sodium Lamp.
  • Standard Template for viewing samples at 45º and 90º angles.
  • Large Viewing glass area.
  • High-resolution Touch Screen with auto-detection of angle
  • Standard reference defect recipe with possible reason/action in software.
  • Select a feature to compare the test preform image with the standard defect chart.
  • Test Report includes Reason for Defect Along With Suggested Action.
  • Inbuilt hardware & PLC software.
  • Easy Data Management. Users can create product identification, company, check by details, etc.
  • Test Report in PDF format

Technical specifications of Presto Polariscope strain viewer NXG

  • Display: Large High resolution (7” Touch Screen)
  • Viewing Area: 260 X 240 mm
  • Power: 220V, Single phase, 50 Hz


  • CFL Light
  • sodium Light

Measuring Angle

  • 45º and 90º (Auto Detect)
  • Standard Template: 1
  • Defect Chart: 1
  • Material: Mild Steel
  • Finish: Powder-coated Havel Gray/Blue
  • Dimensions: L 520 x W 585 x H 770 mm corrosion-resistant finish

These high-end features and technical specifications will help to enhance the quality and strength of PET products and ensure accurate product delivery. You can easily visit our testing lab and get a live demo for the use of this testing instrument by giving us a call at +91-9210 903 903. You can also email your needs and requirements to info@prestogroup.com. Our team of experts will assist you well.

How It Works?