Conditions for use of Hot Runners

Use of an HR system always requires a detailed technical and cost feasibility study. The starting point, however, is a set of general technical information on the structural principles of HR moulds, and their advantages and limitations - especially where conditions of use are concerned. The use of HR must arise out of rational needs, and must not be, for example, a manifestation of a designer s ambition, or a symbolic exercise in modern manufacturing methods. 

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Conditions for use of Hot Runners The following assumptions are made for the calculation ... 

Productivity is directly related to cycle time. There usually is considerable common knowledge about a geometry and process conditions that will provide a minimum cycle time. Practices such as using thinner wall sections, cold or hot runners for TPs or hot or cold ones for TSs narrow sprues and runners, the optimal size and location of coolant (or heat) channels, and lower melt or mold heat, will decrease the solidification time reducing the cycle time. 

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