Injection-Molding Problems Section Two
Delamination in plastic injection-molded parts refers to the peeling of surface layers. The cause of this inadequate bond between the polymer layers is excessive shear in the relatively cold melt in combination with intense cooling of the mold (cold mold). In the case of semi-crystalline thermoplastics, this can lead to the formation of layers having different crystal structures, while in amorphous thermoplastics, this can lead to de-mixing of the melt-additivepigment mixture.
