SIPA in Italy (U.S. office in Atlanta) has come out with a new generation of rotary reheat stretch-blow machines for PET bottles. The SFR EVO3 series is available with six to 24 cavities. New designs for the clamp and cams are said to speed output to 2250 bottles/hr per cavity. A new blowing-valve block is more compact, with 35% less dead air space than before. Energy saving ovens with new lamps and coatings on the reflectors are said to save up to 40% in electrical consumption.
Optional electrically driven stretch rods offer greater ability to fine-tune the process. They also speed changeovers by eliminating the stretch-rod decelerator and stretching cam. The electric stretching system has a “smart” self-learning procedure to identify preform and bottle dimensions. Another option is mechanical compensation in the blowing system, which uses high-pressure blowing air only in the final fraction of a millimeter, providing “massive” savings in air consumption, especially with smaller bottles, the company says.
The SFR EVO3 series has a new standard mold-change system that’s said to be quick and easy. With the cooling circuit now built into the mold cavity, it is much easier to convert from hot-fill to cold-fill bottle production.