A new generation of advanced polyethylene rotomolding compounds reportedly yields parts that are substantially stronger and stiffer than parts of similar thickness molded of conventional metallocene-based MDPE.
A new generation of advanced polyethylene rotomolding compounds reportedly yields parts that are substantially stronger and stiffer than parts of similar thickness molded of conventional metallocene-based MDPE. TekTuff SPA compounds from Teknor Color, Pawtucket, R.I., reportedly offer molders the opportunity to reduce part weight by 10% to 15%. While Teknor’s standard TekTuff compounds also provide this thin-walling capability, new TekTuff SPA compounds are said to require an average of 12.5% less oven time to melt, fuse, and develop optimum properties in the mold. That translates into roughly a 10% reduction in the overall molding cycle, says Teknor. The new compounds reportedly also provide a broader processing window. One user, Heritage Kayaks of Bristol, RI., confirms the benefits of using the new compounds. Says Heritage COO Carolyn Shea, “We have reduced the weight of certain models by 9% and still maintain the high level of toughness for which our products are well known. At the same time, we have achieved reductions in cycle time of at least 10% in certain ovens, which for us means production of roughly six to nine kayaks per shift instead of five to eight. Our production staff also reports reductions in reject rates.”