By J.C. Love, V. Goodship

Many diversifications of injection moulding were constructed and one of many swiftly increasing fields is multi-material injection moulding. This assessment appears to be like on the many options getting used, from the terminology to case experiences. the 3 basic varieties of multi-material injection moulding tested are multi-component, multi-shot and over-moulding. the elemental sorts of multi-material injection moulding, the problems surrounding combining types of polymers and examples of useful makes use of of this expertise are defined.

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This makes the overall cycle time per moulding shorter than the core back technique described earlier. Generally the moulding produced in the first cycle should be expected to melt only on the very surface. This gives the good material separation required but still forms an adequate bond. This does however require good control of the process. 4 Transfer Moulding In this method, the mould rotates through 180° for a two-shot part or 120° for a three-shot part. Rotational capability can be machine or tool based.

Applications for this technology include nylon air inlet manifolds for car engines (312), canoe paddles, tennis rackets, BMX bike wheels and hot water heating pumps. 7 The Future? A variety of multi-material injection moulding variations exist. Some have been described here, others are beyond the scope of this review which has concentrated on plastic material moulding only. It is likely that in the future, commercially successful moulders will require both the understanding and adaptability to utilise a wide range of these process options.

For example, a two component process such as shown in Figure 18 may consist of the following stages: Core back moulding Rotating tool moulding Transfer moulding. 1. The first material is injected into the cavity 2. 2 Core Back Moulding 3. The second material is injected into the cavity Also referred to in various literatures as composite injection moulding or multi-shot. The manufacturer Battenfeld uses the trade name Combiform for this process. Core back is a tooling controlled process. 4. The completed multi-shot component is ejected.

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