By Bob Lebeaux, President, The Plastics Group of America
September 8, 2009
When companies utilize nylon resins to make products by injection molding, they need to be aware of one element that can impact the strength of their finished product – the low moisture content of air in the winter. To address this challenge, some processors simply subject the parts to moisture after molding, either through submersion of the parts in a water bath, or by aging the parts in an area with artificially increased humidity (this can achieved by a humidifier or simply by having some open water sources in the storage space).
Another possible source of molded-in stresses could be the lower temperature of your cooling water in the winter. Carefully controlling the temperature of the molds by making sure that the cooling water is always at the same temperature, regardless of the season, will eliminate this variable and positively impact quality control.
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