Plastics Technology

MAY 2012

Plastics Technology - Dedicated to improving Plastics Processing.

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close up stretch-blow molding New PET Stretch-Blow Machines And Applications Debut at NPE Italian stretch-blow molding machinery build- er Siapi (siapi.it) had a lot to talk about at NPE2012 last month in Orlando, Fla. That included a new series of two-stage (reheat) stretch-blow ma- chines for custom bottles, with options such as a new, flexible neck-orientation system for oval or oblong shapes. Also new were several unusual PET applications, including conversion of 5-gal water coolers from polycarbonate (PC) to PET and conver- sion of large stackable containers from HDPE to PET, thanks in part to new-generation, ultralight preforms. There's also news in PET wide-mouth containers. NEW MACHINES FOR CUSTOM BOTTLES Siapi (represented here by Siapi America Inc., Norcross, Ga.) builds only all-electric reheat stretch-blow machines. Its two latest models are the linear EA4 and EA7, which accommodate two to 10 cavities and offer new options and kits aimed at demanding custom containers such as for cosmetics and house- hold chemicals. These machines (and others in the line) can be equipped with Siapi's newest advanced IR oven banks, said to save en- ergy and optimize material distribution in the bottle. Addi- tional precision in material distribution and weight savings of up to 15% reportedly can be achieved on oval and oblong bottles with a preferential heating option. Unlike competitive systems, there is no cycle-time penalty with this preferential heating system, Siapi states. Specializing in quick-change bottle format flexibility, Siapi has further improved its machine changeover process by reduc- ing the number of change parts, using tool-less quick-release systems, and employing mold-change cart systems. The results are said to be even faster changeovers with minimal investment and reduced need for staff training. A complete machine changeover, including blow molds and change parts, can now be done in as little as 30 min. Siapi has also expanded its custom bottle capabilities with its new IndexMatic flexible neck-orientation system, which is available in three configurations: r/FDL PSJFOUBUJPO DPVQMFE XJUI QSFGFSFOUJBM IFBUJOH JT TVJU- ed to custom bottles with oblong or oval bodies. The preforms Siapi's new EA4 and EA7 reheat stretch-blow machines are aimed at custom bottles with challenging oval or oblong shapes. Siapi says large, stackable, square- based PET contain- ers are attracting attention in North America for chemi- cals and edible oils. Such containers can weigh 50% to 60% less than HDPE and still be stackable four-high. PLASTICS TECHNOLOGY MAY 2012 17

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