Cincinnati Milacron Inc.'s new Tracker T800 midsize industrial blow molding machine uses a Camac 486 control running Milacron's new Quality Tracking System.
QTS allows the control to correct for back pressure and material viscosity changes, to eliminate their influence on parison formation, even when wall thickness varies throughout the shot.
The system also regulates dual-head refill, no longer requiring the operator to adjust the back pressure valve on each head to maintain refill synchronization, the company said.
The 88-ton Tracker is the first blow molding machine from the Cincinnati-based company to feature a modular design.
Clamp, accumulator head, extruder and power packages all come as pre-engineered standard modules. Mixing and matching those components allows for customization.
The clamp comes in two configurations — a low-base model for insert molding or a high-base design for clearance for bidirectional part removal using a conveyor. Other options include a hydraulic clamp roll-out option and a part take-out system, which features parallel gripper arms for efficient part removal.
The clamp area is 52 feet by 52 feet and is fully hydraulic. The three-platen unit also has a two-tie-bar configuration. For stability, the clamp module is supported by an I-beam base.
A single accumulator head can be specified with a 15-pound maximum shot capacity, dual heads with 21/2-pound capacity apiece, or single or dual heads with capacities of 5, 8 or 10 pounds each. Accumulator heads are of Milacron's Cyclone design, using multiple insets built into its spiral channels to produce a combination of axial and spiral flow. This leads to a controlled material layering that eliminates knit lines, strengthening the parison.
Temperature and pressure variations throughout the shot keep parison speed consistent and repeatable through the Camac control.
The Tracker's standard extruder feed screw is the 31/2-inch Meltstar Barrier. Machines can be specified with an optional grooved, cooled extruder feed section, which forces the resin into the barrel by creating a pumping action between the longitudinal grooves and the screw.