Uneven bending, Twisting etc on account of differential cooling, differential shrinkage, or non uniform freezing of melt in the mould can cause these conditions in the moulded part
Dimensional distortion of a plastic part after being processed, particularly when molded It is directly related to material shrinkage and the relieving of unwanted stresses forced upon it while being shaped in the mold in a viscous state Warpage is primarily affected by processing conditions that will require changes to eliminate the problem Also the type of plastic being processed may require very tight processing control to produce warp-free parts
Deformation other than contraction that develops in a casting between solidification and room temperature; also, distortion occurring during annealing, stress relieving, and high-temperature service