Preform Defect Chart

Every PET and Preform industry requires some reference charts as well as measurement patterns to compare and match the quality of materials and products that are manufactured on the regular basis. One of the most useful charts that will help in the visual assessment and evaluation of defects found in PET preforms is the Preform defect chart by Presto Testing Instruments. This chart is considered to be one of the most vital parts of these industries as it will help you to detect the defects under natural and polarized lights.

While creating Preforms, there are many sorts of defects that will be found in them that would affect the product quality. Therefore, you need to make sure that you should analyze the defects in advance before shipping your product to the market. With the help of the Presto Preform defect chart, you will get the depiction of all the defects present in your preforms or PET products. This pictorial representation of defects found in preforms will help you to improve your product quality by detecting the defects efficiently. This is a must-have chart for every industry where PET and Preforms are used. This chart is designed for easy understanding of a variety of Preform defects so that they could be easily understood and analyzed. This helps in the accurate comparison of test samples and the defects. There are many defects found in Preforms that must be detected in the ruder to confirm the best quality of the PET products. The Preform defect chart is a major tool that helps in defining various defects found in PET Preforms. It is a depiction of the defects found in the PET Preforms and how they appear in actuality. The images are given for both normal lights and polarized lights. This helps in optimum reference for instant reference.

The main purpose of using this defect chart is to confirm whether your product is free from any defects or not. It is useful as a reference point in PET blowing plants and laboratories, the chart is referred to after viewing in the Polariscope. It has a pictorial depiction of the defects how they look under polarized light as well as the Optimum images for ready reference. A must for all PET blowing plants and laboratories, this defect chart has been arranged in consultation with the industry and specifies three categories of defects when analyzed under polarized light. The classification and comparison of defects also help in maintaining such records in the lab. Thus, you can easily make use of this chart to detect the defects found in various PET products. This chart contains the images of defects that will be found in PET and Preform products and can be viewed under normal to polarized lights. This will help in optimum to instant reference. If you are the one working in PET and Preform industry, then you can easily use this testing instrument for accurate comparison and analysis of defects in the samples.

If you make the use of Presto Preform defect chart, then you can easily be able to detect the defect patterns under different sources of light. It comprises the defects under four main sources that are natural light, defects under polarized light at 45 degrees, defects under polarized light at 90 degrees, and different types of PET & Preform defects. Once you test your specimen under different sources of light, then you can match the specimen test results with the analysis given in this Preform chart. It gives you a standardized template for testing your samples under natural or polarized lights. This chart can be widely used for industries for blowing parts and can be used to find defects under different sources of light. It is considered to be the best way to analyze the quality of products and improve them before sending them to your customers. You can view the defects under 45o and 900 under natural or polarized lights. Each category mentioned here will comprise 12 unique types of defects that should be removed after examination of the sample.

The first defect in this chart is thermal degradation that is caused in preforms mainly due to three main reasons. These reasons include the high temperature of reform, non-uniform temperature, or faster cooling of the preform. The excessive crystalline defect will be found if preform takes too much time for cooling. The Preform tip crystalline defect will be caused when the tip of the preform has a very high temperature, and there is no sufficient cooling is done. Poor operation of the drier will cause the sidewall haze in the preform. This defect will also be caused due to high injection speed. During the manufacturing process, if there is any air bubble found in the preform then it will become defective. You can analyze this defect with the help of this chart.

The flow line turbulence will be caused by a high speed of injection is used or the gate length is longer. The sinking defect will be caused due to insufficient cooling of reform. In addition to that, if there will be a leakage in the Non-return valve or there is a back pressure during the manufacturing process then it will cause a sinking defect. Splash marks are also called silver streak defects and can be caused due to a very high amount of holding pressure and holding time. Also high injection time and low decompression rate. These are some of the reasons due to which defects in preforms occur. You can easily examine these defects and make sure that deliver accurate products to your customers.

Features of Preform Defect Chart

Three Categories Included Viz.,

• Defects Under Natural Light
• Defects under 45° orientated polarized light.
• Defects Under 90° Orientated Polarized Light

(Each having 12 unique types of defects)

• Standardized template for testing samples under Natural and Polarized lights.
• Wide Viewing Area
• High-Quality Light sources used

Technical specifications

• Defects Viewed under Natural Light, 45º oriented polarized light, 90º oriented polarized light
• No. of Defects 12 each in all 3 categories