R. Dray Mfg. Inc. of Texas
PO Box 671326
Dallas, TX 75367 US
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As Seen In Plastics Technology
‘All-Purpose’ Screw for Injection Molding Handles a Wide Range of Polymers
A mixing section with replaceable dams is said to remedy the limitations of so-called “general-purpose” injection screws.
Rethinking the Injection Screw: Is It a Trend?
Renowned screw designer Robert F. Dray wrote to me recently, lamenting that injection molding screw design has not received the kind of attention that the extrusion industry has paid to perfecting this fundamental processing component.
Close-Up On Technology - Interchangeable Dam Adds Versatility to Screw
A new barrier screw has removable keys to change the dam height, allowing the screw to be tuned for highest throughput with resins as different as LLDPE and nylon, says the screw’s designer, Robert Dray, president of R.