PET flakes can be made by transferring a PET melt on a roll and longitudinally drawing the resulting sheet. In order to obtain the required PET, a grafting agent with a mass fraction of (50-300) x 10-6 (calculated based on the total mass of the PET contained in the melt) is used in the melt (one has no less than 3 functional carboxylic acids or derivatives thereof, or alcohols such as pentaerythritol.
Source: Polyester Industry
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