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neerajsinghvns : pet   3

Crystalline vs. Amorphous PET
http://www.ptonline.com/knowledgecenter/Plastics-Drying/Resin-Types/Crystalline-vs-Amorphous-PET;;;
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All PET materials are hygroscopic, so exposure to a humid environment will cause them to absorb moisture. This moisture causes a cleavage in the polymer chain during melt and results in a degradation of the physical properties of the product produced.

Virgin PET
Virgin PET is usually in a crystalline state (indicated by its white color) when it is purchased from a supplier.
Reground PET
Regrind PET material is usually not crystalline, but amorphous and clear in color.
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Agitating the material while heating it to a temperature of about 180˚ F will convert the material from its amorphous state to a crystallized state, ready for drying. We call this process crystallizing but technically, it is a re-crystallization of the material.
states  state  properties  plastics  plastic  crystalline  amorphous  PET 
april 2013 by neerajsinghvns

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