US-based Teknor Apex and the UK company Gumdrop Ltd. have jointly developed solutions to diverting chewing gum waste from landfill by converting it into a raw material for thermoplastic elastomers (TPE).
Gumdrop, which specializes in the recycling of waste chewing gum, has created a program for reclaiming pre and post-consumer gum for use in material it calls Gum-Tec. The company turned to Teknor Apex to develop and produce compounds from the large waste stream of the 500,000 ton per year chewing gum industry.
The challenge was to devise formulation and manufacturing techniques for an altogether new type of raw material in order to produce commercial-scale quantities of compounds that consistently meet the requirements of specific applications, including optimized elasticity, compression set, tensile properties, and other mechanical properties, as well as processability.
“We assembled a multi-disciplinary team drawing on our capabilities for materials analysis, process engineering, and manufacturing,” said Stef Hordijk, Senior Market Manager for Teknor Apex. “The team addressed basic considerations such as feeding it into our equipment, formulating compound recipes using this unique raw material, determining optimal compounding process parameters, and other issues posed by such an unusual feedstock.”
The chewing gum waste comprises up to 30% of the new gum-based TPE compounds. “Like standard TPEs, the Gum-Tec compounds we have developed exhibit a low compression set, can be formulated for either glossy or matte finishes, readily accept colors, and are recyclable,” said Hordijk.
Among the first commercial applications for Gum-Tec compounds was that of Wellington boots available at www.mygumboots.com. The latest is shoe soles. Some other uses are caster wheels, automotive bumpers and floor mats, window gaskets, wristwatch straps, toothbrush grips, and extruded pencils.
“Our aim is to divert the substantial amount of chewing gum waste and convert it into Gum-Tec compounds for use in the runner and plastics market, giving this waste stream a second life and putting it to use in high-quality end products that contribute to sustainability,” said Anna Bullus, Director at Gumdrop. “Every kilogram of chewing gum that goes into a Gum-Tec compound means one less kilogram going to the landfill.”
Source : China Plastic & Rubber Journal
