When High Performance is Mandatory... Consistently recommended by a wide range of resin manufacturers, molders, moldmakers, designers and engineers, Copper-Based Alloy Sprue Bushings have a long-standing reputation as a product that exceeds expectations. Many users are so pleased with the overall performance of this product that now MOLD COMPONENTS – INCH Copper-Based Alloy Sprue Bushings Mold cycles are often limited or controlled by the length of time needed for solidification of the plastic sprue since it must be cool enough not to break or tear as the mold opens. This cycle limiting condition changes by using this bushing – without any other changes to the mold. • Helps prevent sprue sticking, break-off and corrosion With conventional steel sprue bushings, many plastic resins, additives, colorants and combinations lead to corrosion and sticking problems. The inherent corrosion resistance and release properties of the copper alloy used in the sprue bushing results in a significant increase in performance and product life compared to conventional steel sprue bushings. • Yields more rigid sprues with reduced sprue cool time for robotic removal of parts The sprue is often used as the grab point in robotic removal of parts, sprues and runners. This requires that the sprue be rigid enough to resist the pressure of the robot fingers as well as they are now specified in all of the molds they build. Here are several benefits that users rave about: • Reduced sprue cooling and overall cycle time
Property Comparisons: Copper Alloy and Steel Sprue Bushings Materials
THERMAL CONDUCTIVITY AT 68°F BTU/(FT_HR_°F)
THERMAL DIFFUSIVITY AT 68°F FT 2 /HR
MATERIAL COPPER ALLOY P20 TOOL STEEL H13 TOOL STEEL
150
2.32
20
0.39
17
0.31
the extraction forces. With conventional steel sprues, this often means added cooling time to the mold cycle. The high thermal conductivity of a copper alloy bushing reduces sprue cool time, again without any other changes to the mold. • Molding problems caused by sprues are eliminated A molders for a variety of mold and resin applications say that they are able to control many sprue-related problems. As one molder who uses the product said,“I no longer struggle with sprue problems.” These bushings are available in a number of popular standard sizes (see table on facing page), and as non-standards with quick delivery. Contact DME with your next application to reduce sprue cooling and cycle time.
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U.S. 800-626-6653 ■ Canada 800-387-6600 ■ dme.net ■ store.dme.net
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