{"id":514,"date":"2018-10-16T21:58:09","date_gmt":"2018-10-16T13:58:09","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=514"},"modified":"2018-10-21T00:12:50","modified_gmt":"2018-10-20T16:12:50","slug":"shrinkage-and-warpage","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/ja\/2018\/10\/16\/\u53ce\u7e2e\u3068\u53cd\u308a\/","title":{"rendered":"\u53ce\u7e2e\u3068\u53cd\u308a"},"content":{"rendered":"<p>[et_pb_section bb_built=&#8221;1&#8243; fullwidth=&#8221;off&#8221; specialty=&#8221;off&#8221;][et_pb_row][et_pb_column type=&#8221;4_4&#8243;][et_pb_text _builder_version=&#8221;3.10.2&#8243; border_width_all=&#8221;3px&#8221; border_color_all=&#8221;#e5e5e5&#8243;]<\/p>\n<h2>Why do they occur?<\/h2>\n<p>Shrinkage is inherent in the injection molding process. Shrinkage occurs because the<br \/>\ndensity of polymer varies from the processing temperature to the ambient temperature<br \/>\n(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<br \/>\nenough to overcome the structural integrity of the part, the part will warp upon ejection<br \/>\nfrom the mold or crack with external service load.<\/p>\n<h2>Shrinkage<\/h2>\n<p>The shrinkage of molded\u00a0plastic parts\u00a0can be as much as 20 percent by volume, when measured at the processing temperature and the ambient temperature. Crystalline and semi-crystalline materials are particularly prone to thermal shrinkage; amorphous materials tend to shrink less. When crystalline materials are cooled below their transition temperature, the molecules arrange themselves in a more orderly way, forming crystallites. On the other hand, the microstructure of amorphous materials does not change with the phase change. This difference leads to crystalline and semi-crystalline materials having a greater difference in specific volume ( ) between their melt phase and solid (crystalline) phase. This is illustrated in Figure 1 below. We\u2019d like to point out that the cooling rate also affects the fast-cooling pvT behavior of crystalline and semi-crystalline materials.<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_1336\" style=\"width: 642px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1336\" class=\"wp-image-1336 size-full\" title=\"Shrinkage and warpage\" src=\"https:\/\/web.archive.org\/web\/20141001102803im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Shrinkage-and-warpage.gif\" alt=\"Shrinkage and warpage\" width=\"632\" height=\"404\" \/><p id=\"caption-attachment-1336\" class=\"wp-caption-text\">new<\/p><\/div>\n<p><strong>FIGURE 1.<\/strong>\u00a0The pvT curves for amorphous and crystalline polymers and the specific volume variation\u00a0 between the processing state (point A) and the state at room temperature and atmospheric pressure (point B). Note that the specific volume\u00a0 decreases as the pressure increases.<\/p>\n<h3>Causes of excessive part shrinkage<\/h3>\n<p>Excessive shrinkage, beyond the acceptable level, can be caused by the following factors. The relationship of shrinkage to several processing parameters and part thickness is schematically plotted in Figure 2.<\/p>\n<p>\u2013 low injection pressure<br \/>\n\u2013 short pack-hold time or cooling time<br \/>\n\u2013 high melt temperature<br \/>\n\u2013 high mold temperature<br \/>\n\u2013 low holding pressure.<\/p>\n<h3>Problems caused by part shrinkage<\/h3>\n<p>Uncompensated volumetric contraction leads to either sink marks or voids in the molding interior. Controlling part shrinkage is important in part, mold, and process designs, particularly in applications requiring tight tolerances. Shrinkage that leads to sink marks or voids can be reduced or eliminated by packing the cavity after filling. Also, the\u00a0mold design\u00a0should take shrinkage into account in order to conform to the part dimension. Part shrinkage predicted by C-MOLD offers a useful guideline for proper mold design.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p><div class=\"et_pb_row et_pb_row_0 et_pb_row_empty\">\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div> 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 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-514","post","type-post","status-publish","format-standard","hentry","category-news2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Shrinkage and warpage - Plastic Mold | China Mold Maker<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.plasticmoldco.com\/ja\/2018\/10\/16\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"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 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.plasticmoldco.com\/ja\/2018\/10\/16\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\/\" \/>\n<meta property=\"og:site_name\" content=\"Plastic Mold | China Mold Maker\" \/>\n<meta property=\"article:published_time\" content=\"2018-10-16T13:58:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-10-20T16:12:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/web.archive.org\/web\/20141001102803im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Shrinkage-and-warpage.gif\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.plasticmoldco.com\\\/ko\\\/2018\\\/10\\\/16\\\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.plasticmoldco.com\\\/ko\\\/2018\\\/10\\\/16\\\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\\\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/www.plasticmoldco.com\\\/el\\\/#\\\/schema\\\/person\\\/8377d429cf711f79d68feec3e8648777\"},\"headline\":\"Shrinkage and warpage\",\"datePublished\":\"2018-10-16T13:58:09+00:00\",\"dateModified\":\"2018-10-20T16:12:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.plasticmoldco.com\\\/ko\\\/2018\\\/10\\\/16\\\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\\\/\"},\"wordCount\":464,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.plasticmoldco.com\\\/el\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.plasticmoldco.com\\\/ko\\\/2018\\\/10\\\/16\\\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/web.archive.org\\\/web\\\/20141001102803im_\\\/http:\\\/\\\/www.moldchina.org\\\/wp-content\\\/uploads\\\/2011\\\/10\\\/Shrinkage-and-warpage.gif\",\"articleSection\":[\"news2\"],\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.plasticmoldco.com\\\/ko\\\/2018\\\/10\\\/16\\\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.plasticmoldco.com\\\/ko\\\/2018\\\/10\\\/16\\\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\\\/\",\"url\":\"https:\\\/\\\/www.plasticmoldco.com\\\/ko\\\/2018\\\/10\\\/16\\\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\\\/\",\"name\":\"Shrinkage and warpage - 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