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href=\"https:\/\/www.plasticmoldco.com\/ja\/2018\/10\/17\/\u0627\u0644\u0641\u0635\u0644-26-1\u0627\u0644\u0627\u0646\u0643\u0645\u0627\u0634-\u0648\u0627\u0644\u0627\u0644\u062a\u0648\u0627\u0621\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 26-1,Shrinkage and warpage - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"Why do they occur? Shrinkage is inherent in the injection molding process. Shrinkage occurs because the density of polymer varies from the processing temperature to the ambient temperature (see Specific volume (pvT diagram)). During injection molding, the variation in shrinkage both globally and through the cross section of a part creates internal stresses. These so-called residual stresses (see Residual stress) act on a part with effects similar to externally applied stresses. If the residual stresses induced during molding are high enough to overcome the structural integrity of the part, the part will warp upon ejection from the mold or crack with external service load. 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