BIOPLASTICS | FORMULATION AND COMPOUNDING
cy. Use of EBS reduced melt temperature consider- ably. A lower processing temperature combined with shorter residence time on the compact processor supports molecular weight retention. The achieved throughput rate of 450 kg/h falls within the nominal production range for the CP550. However, achieving maximum production rate was not a consideration for this study and the research- ers believe higher production rates are achievable. The Farrel Pomini R&D Team has also completed
Above: Farrel Pomini’s CP550 lab trials show the machine is a good option for processing talc-filled PLA
The CP550 was run at 450 kg/h compared to 20 kg/h on CPeX. Various talc loading levels were used: 0%, 20%, 40%, 50% and 60%. As ethylene bis-stearamide (EBS) is commonly used as a process aid for PLA some additional runs were carried out using 1% EBS in the formulation in order to study its effect on compounding performance. The study showed that molecular weight (Mw)
retention as a function of talc loading level on the production machine follows the same trend as on the lab-scale CPeX. At low talc loading levels, it was close to 100, which means negligible molecular degrada- tion. At 50% and 60% talc loading, Mw retention on the CP550 is lower than on the CPeX, but still much higher than on the small TSE. The addition of 1% EBS increased Mw retention significantly. Process temperatures on the CP550 were higher than those seen on the CPeX. This is attributed to the high surface-to-volume ratio of the laboratory scale CPeX, which leads to higher cooling efficien-
several studies processing PHA. Like all polyesters, PHA is temperature sensitive and subject to material degradation. It is also important to thoroughly mix PHA for a homogeneous final compound. “The Farrel Pomini research & development studies have shown that continuous mixing technology effectively process- es PHA compounds with low melt temperatures for excellent polymer integrity,” the company says.
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www.caiadditives.com �
www.condensia.com �
https://abmcomposite.com/ (Arctic Biomaterials) �
www.aimplas.net �
https://composites.umaine.edu/ �
www.ornl.gov �
www.finnfoam.com �
www.vttresearch.com �
www.bio-bean.com �
https://nexeinnovations.com/ �
www.natureworksllc.com �
www.bio-fed.com �
www.basf.com �
www.farrel-pomini.com
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IMAGE: FARREL POMINI
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