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zones on the controller. External pin-position monitoring devices can eliminate this dangerous practice. The greatest advantage of having position sensors on the actuator is that they allow the hot runner to be used with flow-control technologies after it has been determined that there is in fact a need for additional control. There are many types of flow-control technologies available today that allow the molder to manipulate the movement of the valve pins. Some technologies slow the movement of the pin for the entire stroke. Others give the molder the option of defining a reduced speed as well as a distance over which that reduced speed will be maintained before returning to full speed. Technologies that control the opening speed of the valve pin help eliminate visible pressure lines in the part commonly caused by the sudden shifting of the pins while the manifold is pressurized. Other technologies provide full pin-position control, allowing the molder to fully define the velocity, acceleration, and stroke of each pin. These types of control technologies offer the molder with hydraulic or pneumatic actuators the same pin- control capabilities available with some electric actuators. They provide the same capabilities as the moni- toring and controlled open-speed technologies but can also allow the molder to balance tools, fill extremely Simple devices can show remotely the current status of each pin, making troubleshooting both faster and safer. Modular Split-A-Part Shredder by Republic Machine. If your shredder can't do all this, then you are living in the Dark Ages. To schedule a demo call (502) 637-6778. Why? Because we are dedicated to the devastation of any imaginable product, the demolition of downtime and destruction of old technology. It's what we do. We shred old ideas, wasted time, oh, and anything else you can feed us. R E P U B L I C M A C H I N E . C O M 52 AUGUST 2016 Plastics Technology PTonline.com T ips & Technique s