How does Preform perpendicularity tester work?

Reviewed by Anurag Mishra (Sr. Technical Consultant)

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Preforms are used in a variety of industries for a variety of purposes. They can be used to form products, and often times they are used in conjunction with other materials to create a more complex product. Testing the perpendicularity of these preforms is a necessary part of the quality control process. To make it easy for preform and PET product manufacturers to conduct a preform perpendicularity test, we at Testronix have designed a high-quality preform perpendicularity tester. This high-quality lab testing instrument is highly useful to test the shape and size of the preforms. Here in this blog, we are going to discuss how the preform perpendicularity tester works and its importance in PET and the preform industry.

Introduction about preform perpendicularity tester

It's crucial to guarantee the best possible quality for your products as a preform maker. This entails includes that the products are produced in accordance with the proper tolerances and requirements. Testing the verticality or perpendicularity of these preforms is one crucial component of delivering accurate products to the customers. For a variety of reasons, perpendicularity is a crucial characteristic. Failures in the quality of the bottles will result from a preform that is not perpendicular. Besides this, an improper preform will also affect the strength and stability of the product. Thus, we at Testronix have designed a high-quality preform perpendicularity tester that is used to test the perpendicularity of preforms with ease.

A preform with poor quality will directly impact product quality and even the aesthetics of the product. Thus, with the use of the Testronix preform perpendicularity tester, manufacturers can easily test the shape and size of the preforms and ensure that quality products will be delivered to the customers. The specimen will be rotated with the probe on turnable that in turn will calculate the checks for the differential movement. The quality of the preform will be directly proportional to the shape and size of the preform.

This easy-to-operate lab testing instrument consists of zero tolerance and adjustable measurement operations for repeatability test measurement of bottles/blow molded containers. Now, let us discuss the working of this lab testing equipment.

How to test the perpendicularity of bottles with Testronix perpendicularity tester?

One of the most important aspects of preform quality control is their perpendicularity. If the preform is not perpendicular or balancing then it would result in a defect in the product quality. To make it easy for PET and preform product manufacturers to conduct a test on preforms, we at Testronix have designed a high-quality preform perpendicularity tester that is helpful in checking the linearity of the bottles with ease. To conduct a preform perpendicularity test on the preforms, you can easily follow the steps mentioned below.

  • Place the magnetic stand on the base plate of the perpendicularity tester and turn the knob OFF and ON.

  • After that, you can adjust the dial gauge shaft on the rod in position with the sample placed.

  • You can mark 4 points on the preforms in 360 degrees.

  • Put the sample on the preform holder in such a manner that the gauge knob touches point 1 and presses up to 2 mm.

  • You can set the point manually to 2 and if the reading remains zero then it indicates that the sample is perfectly perpendicular. If the reading increases or decreases then it means that the preform is not perpendicular.

  • You can then rotate the sample to points 3 and 4 and measure the deviation in the preform perpendicularity, from the digital gauge.


In this way, you can easily operate this lab testing equipment and conduct preform perpendicularity test on the material. You can read more about the working of the preform perpendicularity tester here. If you want to know more about this lab testing equipment then you can give us a call at +91 9313140140 or email us at Our team of technical experts will easily assess you regarding your needs and queries.

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