Hot Runner Cleaning System Uses Sand for a Safer, Less Caustic Scrub

The Alliance Hot Runner Manifold Cleaning System applies high temperatures to sand to remove rubber, plastic and paint from steel parts.

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The main component of the hot runner cleaning system by Alliance Laser Sales Inc. is an insulated reactor that contains sand particles. The sand is heated to over 850°F and brought to a bubbling, fluidized state by injecting air from the bottom. A flame shield at the bed surface directly heats the reactor so as to achieve the extreme temperature. Alliance Laser says that it is not turbulent enough to be abrasive on the parts. According to the company, the sand gently scrubs, vaporizes and burns off the organic material from the surface, which leaves the metal clean and undamaged. The fluidized sand ensures that the parts are subjected to an even temperature profile to avoid distortion of any kind. The old plastic is thermally degraded within the sand bed and the flame shield oxidizes the toxic gases at the bed surface. The sand particles abrade inorganic particles and blows them out of the sand bed where a filter system captures them.

Alliance Laser says that the cleaning system cleans steel parts without incurring damage, uses environmentally friendly stripping technology, functions without acids or stripping chemicals, can safely remove plastics, rubber, paint, grease and other contaminants, has fast turnaround times and performs consistently.