PTC Preform Strain Viewer PSV-202 Chinese Polariscope
TheStrain viewer(Ref.PSV-202)has beendesignedto observe and analyze the internal stress of preformandotherplastic products .
Detecting object
- Preform ( Color and colorless types )
- Other transparent plastic products
Plastic molds , plastic bottle , cosmetic bottle , beverage bottle, plastic tray, plastic film ., etc
Specifications
Analyzer : diameter 100mm
Viewing field:200mm*200mm
Measuring height :236mm
Overall size:310*285*350mm
Voltage:220VAC( with a AC/DC adaptor )
Light source:White fluorescent lamp
Weight:8KG
Measuring Principle
Thestress inside plastic products has a birefringent characteristic. In other words, if there is stress inside of these types of products, lightfrom he polarized lamp will be divided into different units, which produce optical interference phenomenon(ripple patterns) in turn.
When inspecting apreform under polarized light, the stripes ( patterns ) caused by molecular orientational strainbecomesvisible.
These patterns are anexcellent indication of preform qualitywhen considered along with other defects which are more clearly under polarized light.
A well-made preformwill displayorderly stress patterns, whileirregular stress patternsindicate a poorly made perform. To ensure an evenconsistent material distribution throughout the bottle walls during blowing process, it is important to use a well-made perform.
Defects such ascrystallization are usuallyinvisibleundernaturallight source, buttheycan bemuchclearwhenobserving under polarized light.
When placing a preform on a strain viewer, theangle at which the preform is placed relative to the polarization axis is very important.
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