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Balancing the Runner System in Multi-Cavity Injection Molds

1 Balancing the Runner System in Multi-Cavity Injection Molds [Pg.303]

Inevitably, in multi-cavity injection molds, some of the mold cavity gates are located further than others from the sprue that delivers the melt from the plasticating unit. If the runner system that distributes the melt from the sprue to the individual cavities has a constant [Pg.303]

Cumulative residence time distribution for a stirring tank with perfect mixing. [Pg.304]

Schematic diagram of an eight cavity mold system with various runner lengths and [Pg.304]

Sample balancing problem. Let us consider the multi-cavity injection molding process shown in Fig. 6.54. To achieve equal part quality, the filling time for all cavities must be balanced. For the case in question, we need to balance the cavities by solving for the runner radius R2. For a balanced runner system, the flow rates into all cavities must match. For a given flow rate Q, length L, and radius R, solve for the pressures at the runner system junctures. Assume an isothermal flow of a non-Newtonian shear thinning polymer. Compute the radius R2 for a part molded of polystyrene with a consistency index (m) of 2.8 x 104 Pa-s and a power law index (n) of 0.28. Use values of L = 10 cm, R = 3 mm, and Q = 20 cm3/s. [Pg.305]




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Balanced system

Cavity molding

Cavity system

In-mold molding

Injectable systems

Injecting system

Injection molding cavities

Injection molding in-mold

Injection molding mold-cavity

Injection molding system

Injection systems

Mold cavity

Mold runner

Mold runner balanced

Molding Systems

Molds balanced

Multi-system

Runner system

Runner system multi-cavity

System balance

The Mold

The injection system

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