The molded component is twisted, uneven, or bent shape where one was not intended. Warping is usually caused by non-uniform cooling of the mold material. Different cooling rates in different parts of the mold cause the plastic to cool differently, thus creating internal stresses. These stresses, when released, lead to warping.
@Ensure that the cooling time is sufficiently long and that it is slow enough to avoid the development of residual stresses being locked into the part.
@Design the mold with uniform wall thickness and so that the plastic flows in a single direction.
@Select plastic materials that are less likely to shrink and deform. Semi-crystalline materials are generally more prone to warping.