All about dip moulding

If the design engineer knows about it at all, he will probably think of dip moulding as a slow process with limited applications.

But the process of dip moulding has come a long way. It is now being used for components in products such as measuring equipment, computers and vehicles. One company, Cove Industries, has developed what it is calling a Flexi-busbar, a copper conductor with a PVC coat. The busbar can be manufactured in a number of shapes and an almost limitless number of additions or connection points and colours.

The process of dip moulding is fast. Tools are heated, dipped into a liquid PVC plastisol, taken out, cured, cooled and removed from the tool to create plastic mouldings.

Prototypes can be made easily, so the designer is able to make modifications without great expense.

The plastisol material used determines the physical attributes such as hardness and resistance to heat, oil or chemicals. The time the tool stays in the plastisol determines the wall thickness of the moulding which has a normal range of between 1mm to 4mm per dip.

The tool, with the plastic coating that represents the moulding, is then moved to a curing oven where it is again heated before travelling to a cooling tank to prepare it for stripping, a process that removes the moulding from the tools. Post moulding operations such as punching, trimming and printing can then be performed and modifications to the part made.

{{Cove PlasticsTel: Farnborough (01252) 542815Enter 402}}