Uniloy Milacron Inc., Tecumseh, Mich., has unveiled its first accumulator-head blow molder with parison suction capability for producing under-hood automotive ducts. This method reduces flash significantly and eliminates the parting line that follows the longitudinal profile of the part. The risk of breakage is eliminated and wall-thickness uniformity is improved. A 30-mm to 40-mm parison is extruded for a 60-mm part. The accumulator first pushes the parison into the closed mold and then a vacuum system pulls the parison through the cavity. Moving parts in the mold seal the cavity before the part is blown. The 20-ton model UMA 20 SH has a 1.3-liter accumulator and a 60-mm extruder. The machine can produce HMW-HDPE filler pipes with 60-mm diam. that are 4 to 5 mm thick and weigh about 400 g. With less flash, there is no need to oversize the extruder, the head, or the clamp unit, according to Marco Solinas, Uniloy's industrial product-line manager. "You need a smaller shot of material and that resin is used almost entirely to shape the part," explains Solinas. The UMA 20 SH produces only 5% to 10% scrap, compared with an average of 30% to 70% for most blow molded parts. The bottom-blow UMA 20 SH can perform sequential hard/soft coextrusion using two materials. It also provides accessibility: The work area is open on three sides and there is ample room to accommodate a traditional blowing stand and tall molds.
5550 S. Occidental Rd. #B Tecumseh, MI 49286-8749
Phone (517) 424-8900 Fax