Feed System is the main connecting link between the machine nozzle and the part cavities of the mould. Fill/Pack Transfer describes a series of events that happen at the transition between the filling phase and the packing phase of the moulding cycle. These events involve changes to the state of the machine, the material and the mould. Fill Pattern is a visual history of how a mould fills under a specific set of moulding conditions. The lines on the part show the progress of the melt front at particular points in time after filling has begun. Fill Time is the length of time in seconds that it takes to just fill the mould with melted plastic material during the filling phase of the moulding cycle. Flow Balancing is the process of choosing a mould design strategy which promotes even filling of the mould. First, a gating strategy is selected which will promote ease of filling. Second, a runner layout is developed to feed material to the gates. Finally, runner dimensions are identified which will cause all of the flow paths to fill at the same time. Flow Length is the total distance that plastic material must travel from the machine barrel along a particular flow path in order to completely fill a section of the mould. Flow Path describes the route which is travelled by a melt front as material fills a section of a mould. Flow Rate is a way of describing how much material goes through or past a specific point in a fixed period of time. If the nozzle tip is used as a reference, flow rate can describe how much material is flowing out of the machine per second during injection. Flow rate by volume is usually measured in units of in^3 / sec or cm^3 / sec. Fountain Effect describes how the material at the melt front behaves during the filling of the mould. The leading material swells into the shape of a bubble and behaves in much the same way as water flowing from a fountain. Frozen Layer is a skin of solid material that forms next to the mould walls during the filling phase of the moulding cycle. Gating Strategy is the approach you use to choose the number and location of gates in a mould. Hydraulic Pressure is the pressure that is acting on the machine screw during moulding. Hydraulic pressure is developed by pumping oil into the chamber behind the injection ram.