Process efficiency is one of the largest concerns in the industry today. Improving the efficiency and reliability of a process is a great way to reduce overhead, this post specifically addresses optimization of packing pressure.
Packing Pressure Window: Assuming the transfer is developed with a 1st stage short shot, you should determine the minimum and maximum pressure which provides an acceptable part to determine the process window.
Packing Efficiency: Once you determine the range or acceptable packing pressures you can select the best packing pressure based on your application. For example if it is an engineering part, you might select a pressure in the middle. If it is a commodity part, you may use a pressure near the lower end of the window to reduce part weight and material usage by as much as 4% for thick walled parts.