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September 27, 2016 02:00 AM

Study says hot-fill bottles can use more recycled PET

Jim Johnson
Senior Reporter
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    Canadian Plastics Industry Association
    A Plastic Technologies Inc. study says hot-fill bottles can use up to 50 percent recycled PET content without impacting performance or clarity.

    A new study shows that bottle makers can use up to one-half recycled PET content in hot-fill bottles without what is being called a “significant adverse impact.”

    The research by Plastic Technologies Inc. of Holland, Ohio, delves into the issue of recycled PET because the company said brand owners continue to look for ways to lower their carbon footprints.

    “With increasing demand for recycled PET use, there have been general questions raised on how well rPET work(s) in higher performance packaging,” said Ron Puvak, director of marketing and new business development at PTI. “As part of our thought leadership position we felt it was a worthwhile project to understand the limitations for use in specifically hot fill packaging.”

    Puvak said recycled PET is being used in “limited amounts” for hot-fill applications at this point. “The level of rPET use is normally a self-imposed brand owner specification.”

    “We have proven that higher levels do not impact performance, which was the goal of the exercise,” Puvak said.

    PTI studied recycled PET resins at 25-, 50- and 100-percent levels in 500 milliliter bottles and preforms weighing 27 grams.

    “Even at 100 percent [recycled] rPET resin use, the performance of the bottle used in this study was still acceptable,” said Tracy Momany, vice president product development group at PTI, in a statement. “However, the typically thicker walls of hot-fill bottles may result in slightly more noticeable haze or yellowing than other applications such as very thin-walled water bottles.”

    PTI tested areas including top load performance, wall thickness, color, haze, crystallinity and acetaldehyde content.

    Shrinkage increased slightly when the recycled content went over 50 percent, but the bottles still met specifications, PTI reported.

    Drawbacks, the company said, included that yellowing and haze increased with high rPET levels, but those aesthetics do not impact performance.

    “Companies using hot-fill bottles that are looking to improve their environmental profile can confidently use up to 50 percent rPET content in their PET bottles without negatively impacting performance,” reports PTI, a design, development and material evaluation engineering firm for the plastics packaging industry. “The aesthetics of the package will dictate the level of rPET acceptable for a particular application.”

    Access to the report is available here.

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