Canadian Plastics

Clarified PP injection stretch blow molded for water bottles

Canadian Plastics   



After six years of research and development, Polipropileno del Caribe S.A. (Propilco) achieved a breakthrough -- a transparent, injection stretch blow molded, narrow neck 500-ml water bottle in clarif...

After six years of research and development, Polipropileno del Caribe S.A. (Propilco) achieved a breakthrough — a transparent, injection stretch blow molded, narrow neck 500-ml water bottle in clarified polypropylene (cPP). This development positions cPP as a possible alternative to PET in the bottle beverage market, and opens new doors for cPP in hot-fill juice, milk and sauce applications. Milliken Chemical supplied technical support for the project, and supplied the clarifying agent, Millad 3988.

“Cost and performance advantages are cited as the driving forces for the material substitution from PET to cPP,” explains Rafael Becerra, Propilco’s R&D coordinator. “Bavaria (a Columbian producer of beer, juice and water) hoped to take advantage of cPP’s good transparency, organoleptic and mechanical properties, and lower cost.”

Propilco used Unipol technology to develop and test several grades of cPP. Bavaria and Propilco settled on 13R30C, a random copolymer grade with a broad molecular weight distribution and a key additive package to meet organoleptic requirements. The additive package includes Millad 3988, which gives the bottle transparency, gloss, stiffness and improved processability.

Machinery manufacturers Arburg and Bekum partnered with Propilco to design and manufacture molds and machines for the project. With only a few changes, Bekum’s machine can also process PET.

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Milliken Chemical 864-503-2200

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