![]() There are no ‘critical’ cavities as in injection molding,” he says (see table). Savorani also cites higher preform consistency.The preforms are handled carefully so they are not scratched or dented. This system has no gate!” Preforms thus avoid problems of voids, pinholes, or crystallinity at the gate, as well as long or pulled gate vestiges. Quality-According to injection molding sales manager Marco Savorani, “Fifty to sixty percent of preform quality problems are related to the gate.Sacmi claims several benefits for its new process: On the other hand, Sacmi recently established a PET division to offer complete preform manufacturing systems encompassing injection presses from its Negri Bossi subsidiary (which now incorporates two other Italian press makers with preform experience, Oima and BM Biraghi), as well as Negri Bossi robots and Sacmi’s preform molds and vision inspection systems. Its PAM system is an outgrowth of its established machinery for continuous compression molding of beverage-bottle caps and other closures, which now can turn out up to 100,000 caps/hr. While potentially fomenting a battle between injection and compression molding for the preform business, SACMI has a foot in both camps. By next month, Sacmi plans to have built two machines for in-house development use and hopes to commercialize the system in the second half of this year. It’s still too early for PAM to offer a serious challenge to injection molding. The Preform Advance Molding (PAM) process was introduced at the recent K 2007 show in Dusseldorf by Sacmi Imola S.C. Lower cost, higher quality and productivity, and the potential for lightweighting beyond anything yet seen are benefits claimed for a new continuous compression molding process for making PET bottle preforms. ![]() The continuously turning compression molding carousel is housed in a dehumidified enclosure. ![]()
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