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Influence of stress defects on glass and plastic products

  • Source: Unknown
  • Date: October 21, 2020
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The existence of internal stress in glass and plastic products will affect the mechanical properties and use of products, and in serious cases, it will damage products and indirectly hurt users. Its existence will reduce the resistance of products to light, heat and corrosive media, affect processing and reduce product yield. At the same time, the products will appear cracks, irregular deformation and warpage, and the surface of the products will be white, turbid, and the optical performance will decline.
 
Stress and application
 
The inferior glass water cup will be broken and damaged if it cools suddenly after being heated. Because there is stress inside the glass, we can't see the stress directly, but we can sense its existence. Therefore, we need to use professional instruments to detect and analyze it, so as to apply it to production activities. There are many stressed entities in the glass industry, such as ampoule bottles, pharmaceutical bottles, glassware, wine bottles, sapphire crystal bars, crystal blocks, etc.


 
In the plastic industry, such as PET bottle blanks, contact lenses, plastic films, car lampshades, etc.
 
Tools for stress detection:
 
For measuring the stress caused by glass or plastic, the commonly used equipment is the polarized qualitative internal stress detector, which has many applications. Its outstanding characteristics are: intuitive, portable, defect detection, nondestructive testing, high cost performance, etc. The stress in the product can be displayed intuitively through color differentiation, and is mostly used for quality control.
 
Next, we will introduce the simplest qualitative stress instrument: polarizing stress instrument PSV-202. It uses imported optical elements to make the working field of view a uniform purplish red field of view. The LED light source has a longer life. At the same time, the super large field of view also has a smaller volume, portable operation, excellent detection effect, and very high cost performance. The following is the comparison diagram of PSV-202 sample defects for glass and PET bottle preforms.
 
Usually, the stress is analyzed by observing the uniformity and disorder of its stress color stripes (as shown in the figure). In addition, the defects of the product can be clearly identified, and the product can be analyzed from multiple angles.

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