COMPACTS PIN DOWN COSTS
November 1st 2004

Coil pins from Spirol Industries have been specified for the hinges of a new line of cosmetic compacts to help reduce costs.

The company says its coil pins have become the fastener of choice for plastics because they fit readily into holes and distribute stress uniformly.

As the pin is a helical spring throughout its length and has smooth swaged chamfers, it accommodates small misalignments and minor diameter variances between mating parts as it is being inserted.

Due to the radial pressure of the pin in the hole, it is not necessary to design and mould in misalignment to create a friction hinge. This significantly reduces scrap and rejects.

Another cost reduction claimed for the coil pin results from reduced assembly time. Typically, pins used for compacts are less than 1.5mm in diameter. This in itself was a problem.

However, when the Spirol coil pin is coupled with an automatic HC pin insertion machine, developed by Spirol for the application, productivity is increased.

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