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China, Chinese Designing Runner Cross Sections of Injection Mould1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Other MouldsMouldMold
Shenzhen Meibang Precision Technology Co., Ltd.
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Product Description Common designsThere are several common runner cross-sectional designs. They are illustrated in Figure1.l Full-round runnerl Trapezoidal runnerl Modified trapezoidal runner (a combination of round and trapezoidal runner)l Half-round runnerl Rectangular runnerRecommended cross-sectional designsThe first three runner cross-sectional designs listed above are generally recommended.Full-round runnerThe full-round runner is the best in terms of a maximum volume-to-surface ratio, which minimizespressure drop and heat loss. However, the tooling cost is generally higher because both halves of themold must be machined so that the two semi-circular sections are aligned when the mold is closed.Trapezoidal runnerThe trapezoidal runner also works well and permits the runner to be designed and cut on one side ofthe mold. It is commonly used in three-plate molds, where the full-round runner may not be releasedproperly, and at the parting line in molds, where the full-round runner interferes with mold slidingaction.FIGURE 1. Commonly used runner cross sectionsHydraulic diameter and flow resistanceTo compare runners of different shapes, you can use the hydraulic diameter, which is an index offlow resistance. The higher the hydraulic diameter, the lower the flow resistance. HydraulicRunner Cross Sectionsdiameter can be defined as:Figure 2 illustrates how to use the hydraulic diameter to compare different runner shapes.FIGURE 2. Equivalent hydraulic diameters
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