Glass is widely used as packaging material in industries that require the non-reactive properties of the material. Some common examples are in the pharmaceutical industry, chemical industry, processed food, etc. Glass has very brittle properties and it may exhibit some volatile behavior due to internal strain. Defective glass bottles may break accidentally and may remain silent. You can't predict. But we can't take that risk because shards of broken glass are dangerous, especially if the packaging is used domestically. To avoid any product failures, the fill is tested .
What is a polarizer and how does it work?
A polarizer strain viewer is an optical device with 2 color filters or sheets. These sheets are designed in such a way that the electronics only allow parallel light to pass through it. All other light will be absorbed by electrons aligned in parallel lines. It has 2 parallel plates and an incident light source. The sheet has parallel lines along its axis. This is why if the sheets are aligned , they allow the light to pass through. Therefore, the test sample has no defects and the flake allows light to pass through it. On the other hand, if there is any defect, the light will be refracted twice and electrons will absorb this light. This absorption of light produces a black isoclinic impression or birefringence on the other side.
What is the importance of observing strain in glass?
The QA process is not complete without a testing process. Ridges and grooves are some common defects that are easy to see with the naked eye. This is a form of external defect. Some internal strain is due to manufacturing defects, such as air bubbles, uneven thickness, etc. When stress is applied to the strain points, they tend to rupture. Since glass is used in critical applications. We cannot risk their quality testing. Product failure during shipping or storage may damage other products in the batch.
Another reason to incorporate defect identification is shrinkage and expansion due to climate change. When ornaments are transported overseas from extremely cold regions, or vice versa, they may experience heat shock . From the defective area, the strength of the item is lower. Any small physical impact can cause damage to the entire item. This increases rejection and shipping costs. If 15 out of 50 items fail in transit, this will result in increased shipping costs.
Other Applications of Polarizers
It is widely used in the gemological industry to identify flaws in expensive gemstones. Identify the quality of a gemstone based on its internal flaws.
