Plastics Technology

JUN 2013

Plastics Technology - Dedicated to improving Plastics Processing.

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achieve mold-open times of only 0.3 sec. Two small motors are said to be more economical than one larger one and they have faster acceleration and cause less wear on the indexing belt. This development was demonstrated on the a new model W937 2-drive robot. MORE PROCESS INNOVATIONS Another novelty at the open house was a process for in-mold internal welding (IMIW). It provides a means of encapsulating sensitive electronics such as RFID chips while protecting them from damage from heat or pressure during molding. IMIW was developed by Barkley Plastics, a British molder and moldmaker (barkley.co.uk). As demonstrated on an EcoPower 110m.t. press, the process involves molding two halves of the encapsulating shell on opposite mold faces. When the mold opens, the mold plate slides to the side and a robot inserts the electronics in one shell half. When the mold closes, the two shell halves are brought together and the same material (polycarbonate in this case) is injected between the shell halves, providing a waterand gas-tight seal. When the mold opens, the same robot removes the fnished part. As compared with other processes, such as JSW's Die-Slide molding, there are no external ridges or welding beads joining the two parts, providing a cosmetic seal and requiring no downstream fnishing. On an EcoPower 180-m.t. machine, Wittmann Battenfeld showed off increasing sophistication in in-mold labeling (IML). PLA bioresin bank cards were molded in four cavities with paper labels on both sides of each card. The process required injection of the PLA through one of the labels. Another crowd-pleasing demonstration utilized the frm's HM ServoPower hydraulic press with servo-electric pump drive and Airmould gas-injection system. The feat was molding a hockey stick of glass-flled PP in an oversized mold with a gas channel 1300-mm long. New in-mold internal welding (IMIW) process allows encapsulation of sensitive electronics. Two halves of the shell are molded on opposite mold faces of indexing mold plates. The electronics are inserted and then the same material (here, PC) is molded between the mating halves. No visible joint results. By Matthew H. Naitove, Executive Editor TOGGLE CLAMPS EXCLUSIVELY MADE IN THE USA You can count on Carr Lane to provide you with top quality, American made toggle clamps in a variety of types, sizes and styles. • Free 3D solid CAD drawings • New, optional safety locks on some styles • Fast shipping Visit CarrLane.com to view toggle clamps in our online catalog. Plastics technology june 2013 15

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