A new line of tunnel-gate inserts designed to handle high-temperature engineering plastics at shot weights up to 1000 g comes from i-mold GmbH & Co. in Germany, distributed here by DMS, Windsor, Ont. The inserts come in three styles produced by a metal injection molding process using highly wear-resistant M2 tool steel. The inserts are offered in a hardness of either 60 Rc or a more machinable 40 Rc, which costs 20% less. The inserts operate at temperatures as high as 572 to 662 F.
One style is the round TGR series in sizes from 0.8 to 2.8 mm for shot weights from 15 to 140 g, depending on the material’s flowability. The TGS series is similar to the TGR but is square. The TGC series can be contoured to meet specific mold requirements, such as locating the injection point away from the edge of the molding. It comes in four sizes for shot weights from 45 g to 1000 g (2.2 lb), depending on the flow of the polymer.