Detecting object

1. Preform ( Color and colorless types )

2. 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: 

Weight:8KG

Measuring Principle

the stress inside plastic products has a birefringent characteristic. In other words, if there is stress inside of these types of products, light from he polarized lamp will be divided into different units, which produce optical interference phenomenon(ripple patterns) in turn.

 

When inspecting a preform under polarized light, the stripes ( patterns ) caused by molecular orientational strain becomes visible.

 

these patterns are an excellent indication of preform quality when considered along with other defects which are more clearly under polarized light.

 

A well-made preform will display orderly stress patterns , while irregular stress patterns indicate a poorly made perform. to ensure an even consistent material distribution throughout the bottle walls during blowing process , it is important to use a well-made perform.

 

Defects such as crystallization are usually invisible under natural light source, but they can be much clear when observing under polarized light.