Tunnel gate is usually conical beheaded, overhanging one side sloping cavity or product. Gate hole diameter d must Consider the weight of the product, the condition of cross-section with long-bends and runners. As a measure taken beginning 0.8 mm to around 10 grams of product weight. After the trial if showed signs are too small gate, gate be enlarged as needed.
Runner is a conduit between the nozzle on the end of the barrel with a cavity in the mold. Melting plastic in the room at the end of the barrel which is the injection, flow through the hole nozzle, sprue holes, conduit or runner, gate and finally enter into the cavity, because it will be a product. Moderate plastic that fills the channels along the runner and sprue, is a waste that must be removed from the mold along with the current product expenditures.
Because it is a waste, then the mold with a cavity much, cavity layout and conditions runner distribution must be considered, in order to get the runner channels as short as possible. With a short runner channel, cross-sectional runner can be made smaller, so the weight of materials that become waste (know by heart) would be small, given the weight - the channel cross section x length x channel density.
Condition of cross section and channel length of the sprue runner each cavity are cultivated together, so that received an injection pressure of each cavity so that the filling of each same acvity balanced.
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