The classical production scheme of food-grade polyethylene terephthalate (PET chips) is based on polymerization of main feedstocks: ethylene glycol (EG) and terephthalic (TFA) acid using melt polycondensation.
In this process, subsequent additional solid-state polycondensation (SSP) is required to obtain a food-grade polymer, which increases the molecular weight of the polymer and reduces the content of acetaldehyde and ethylene glycol up to accepted values.
2R-MTR® (Melt-to-Resin *) technology, developed by the company Uhde Inventa-Fischer is the most state-of-the-art technology available for production of bottle-grade PET for food purposes.
The use of 2R-MTR® technology avoids the necessity for solid-state polycondensation (SSP) ensuring production of high-molecular food-grade PET with improved performance.
The absence of an SSP unit allows to reduce the time of polymer production, having a positive impact on quality characteristics of PET. Owing to 2R-MTR® technology, EköPet PET produced by Ekopet JSC has a number of advantages, such as a lower melting point and lower crystallinity.
The absence of an SSP unit ensures a minimum dust content in the product.