Plastics News correspondent Michael Lauzon reported the following items from the Rotoplas '02 conference, held in Oct. 6-9 in Toronto.
Teknor compound halts pigment swirl
Teknor Color Co. featured antistat technology that prevents pigment swirl in rotomolded polyethylene, regardless of ambient humidity.
Teknor's H2Stat is inherently conductive to dissipate static charge that causes pigment swirl, the Pawtucket, R.I., company explained. H2Stat beats conventional anti-stats that draw moisture from air for conductivity. Such additives typically require relative atmospheric humidity of up to 50 percent, according to Teknor.
H2Stat is based on an aluminum compound and is used as a stand-alone additive or as part of a custom dry formulation. Typical loadings are 0.2-0.4 gram per pound of resin.
DuPont introduces PC release coating
DuPont Coating & Release Systems introduced a release coating for polycarbonate to the rotomolding industry.
TraSys is a release gel coating that provides high gloss to PC or to polyethylene. It provides multiple releases and withstands inner mold temperatures of up to 550° F. The solvent-based product is easily applied on intricate molds, according to the Wilmington, Del., chemicals and plastics company.
Compound addresses mold-flow problems
Mold In Graphic Systems featured a new rotational molding compound that the processor packs into the mold prior to rotomolding.
RMC3 is a pliable, formable polyethylene that an operator packs into areas where flow problems prevent proper mold filling during rotomolding. Crevices, inserts, solid flanges, solid threads and protrusions are some problem areas RMC3 packaging can solve, said the Clarkdale, Ariz., firm. Mold In Graphic claims its product knits right into polyolefins processed in the rotomold.