The SBO Compact2 reheat stretch-blow molding machine from Sidel, Norcross, Ga., features a newly developed stretching system for the preform. The former pneumatic actuator to drive the stretch rod is replaced by an electrical servomotor and ballscrew assembly.
The new approach enables constant control of stretching position and speed, which ensures perfect repeatability of the process. It is also said to be more flexible in accommodating a variety of bottle sizes because it eliminates the need during format changeovers to manually adjust the preblowing and blowing start detectors. Format changeovers are easier because the stretching parameters are managed directly from the controller and no longer within the machine.
In addition, the max. stretching speed is increased from 1 m/sec to 1.3 m/sec. Longer orienting rollers reportedly improve the stability of the preform to further enhance productivity. The SBO Compact2 can blow simple or standard shapes from 0.2 liter to 10 L. It can also handle asymmetric shapes or flat containers through preferential heating. Neck orientation is also possible.
Editor PickSidel’s Lightweight Bottle Design; One Relevant Example of Resin Savings
The current upward trajectory of PET prices makes such designs more attractive.