Family Molding Molds & Parts
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Family Molds are also called Multiple-Cavities Molds
A tool with one part is usually called a single cavity mold, whereas a custom molds with two or more cavities of same part is referred to as a multiple cavity molds(Family Mould). Aside from a single molding part being produced in a molding cycle,molds can be also designed to produce multiple numbers of same parts in one mold,the use of multi-cavity molds is becoming more and more common.Some extremely high-volume production molds,such as bottle caps moulds and preform molds, it can be up to 96 cavities,cutlery tableware plastic injection spoon moulds can reach 48 cavities,there are also medical test tube molds, etc.
A multiple cavities mold may also be referred to as a “family” mold. In fact, a family mold is more accurately defined as one which can produce multiple, like-sized parts in the same quantity and material. Family molding parts are often part of an assembly, such as a product top half and bottom half.
The most important factor to consider in the design of family molds is filling balance. In family(multi-cavity) injection molding molds, the runner system is usually designed as an “H”-shaped structure. The “H”-shaped runner system is geometrically completely symmetrical from the injection nozzle to each mold cavity, so it is also called “geometrically balanced” or “naturally balanced” runner system design.
Of course, the flow and filling of the molten resin in the “H”-shaped runner system is balanced, the melt temperature distribution caused by flow shear heat generation, and the asymmetry after the bifurcation of the runner may still lead to uneven filling in the cavity,so it is necessary to make necessary improvements to the injection