Flow of melt to individual mold cavities in a family or other multi-cavity mold can be selectively blocked or opened with a new Sprue Adjuster device from i-Mold Molding Innovations GmbH in Germany (distributed here by DMS, Oldcastle, Ont.). The device allows molders to shut off feed to a cavity producing defective parts, avoiding the need to sort out rejects. The device is a rotating cylindrical body that is screwed into the mold and can be set to any desired position by means of an Allen screw. The toolmaker machines the melt flow paths into the body so that turning the body opens or closes off the melt channels as desired. The body is sealed by a high-temperature rubber O-ring. The Sprue Adjuster is set manually from the parting surface when the mold is open. The device comes in different sizes with or without a borehole for the lead-through of an ejector pin.
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RocTool’s year-old HD Plastics Materials Database further expanded.