{"id":593,"date":"2018-10-17T00:12:11","date_gmt":"2018-10-16T16:12:11","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=593"},"modified":"2018-10-17T00:12:11","modified_gmt":"2018-10-16T16:12:11","slug":"chapter-26-1shrinkage-and-warpage","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/da\/2018\/10\/17\/kapitel-26-1krympning-og-skaevhed\/","title":{"rendered":"Kapitel 26-1, Krympning og sk\u00e6vvridning"},"content":{"rendered":"<h2>Hvorfor opst\u00e5r de?<\/h2>\n<p>Krympning er en naturlig del af spr\u00f8jtest\u00f8bningsprocessen. Krympning opst\u00e5r, fordi<br \/>\npolymerens massefylde varierer fra forarbejdningstemperaturen til den omgivende temperatur<br \/>\n(se specifik volumen (pvT-diagram)). Under spr\u00f8jtest\u00f8bning skaber variationen i krympning b\u00e5de globalt og gennem et emnes tv\u00e6rsnit indre sp\u00e6ndinger. Disse s\u00e5kaldte restsp\u00e6ndinger (se Restsp\u00e6ndinger) virker p\u00e5 en del med effekter, der ligner eksternt p\u00e5f\u00f8rte sp\u00e6ndinger. Hvis de restsp\u00e6ndinger, der opst\u00e5r under st\u00f8bningen, er h\u00f8je<br \/>\nnok til at overvinde delens strukturelle integritet, vil delen vride sig ved udst\u00f8dning<br \/>\nfra formen eller revne med ekstern servicebelastning.<\/p>\n<h2>Krympning<\/h2>\n<p>Krympningen af st\u00f8bte plastdele kan v\u00e6re helt op til 20 volumenprocent, n\u00e5r den m\u00e5les ved forarbejdningstemperaturen og den omgivende temperatur. Krystallinske og halvkrystallinske materialer er s\u00e6rligt udsatte for termisk krympning; amorfe materialer har tendens til at krympe mindre. N\u00e5r krystallinske materialer afk\u00f8les til under deres overgangstemperatur, ordner molekylerne sig p\u00e5 en mere ordnet m\u00e5de og danner krystallitter. P\u00e5 den anden side \u00e6ndrer mikrostrukturen i amorfe materialer sig ikke med fase\u00e6ndringen. Denne forskel f\u00f8rer til, at krystallinske og halvkrystallinske materialer har en st\u00f8rre forskel i specifik volumen ( ) mellem deres smeltefase og faste (krystallinske) fase. Dette er illustreret i figur 1 nedenfor. Vi vil gerne p\u00e5pege, at afk\u00f8lingshastigheden ogs\u00e5 p\u00e5virker den hurtigtk\u00f8lende pvT-opf\u00f8rsel hos krystallinske og semikrystallinske materialer.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1336\" title=\"Krympning og sk\u00e6vvridning\" src=\"https:\/\/web.archive.org\/web\/20130131102912im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Shrinkage-and-warpage.gif\" alt=\"Krympning og sk\u00e6vvridning\" width=\"632\" height=\"404\" \/><\/p>\n<p><strong>FIGUR 1.<\/strong>\u00a0PvT-kurverne for amorfe og krystallinske polymerer og den specifikke volumenvariation mellem behandlingstilstanden (punkt A) og tilstanden ved stuetemperatur og atmosf\u00e6risk tryk (punkt B). Bem\u00e6rk, at det specifikke volumen falder, n\u00e5r trykket stiger.<\/p>\n<h3>\u00c5rsager til overdreven krympning af dele<\/h3>\n<p>Overdreven krympning ud over det acceptable niveau kan skyldes f\u00f8lgende faktorer. Forholdet mellem krympning og flere forarbejdningsparametre og emnetykkelse er skematisk vist i figur 2.<\/p>\n<p>- lavt indspr\u00f8jtningstryk<br \/>\n- kort holdetid eller k\u00f8letid for pakken<br \/>\n- h\u00f8j smeltetemperatur<br \/>\n- h\u00f8j formtemperatur<br \/>\n- lavt holdetryk.<\/p>\n<h3>Problemer for\u00e5rsaget af delkrympning<\/h3>\n<p>Ukompenseret volumetrisk sammentr\u00e6kning f\u00f8rer til enten synkem\u00e6rker eller hulrum i st\u00f8beformens indre. Det er vigtigt at kontrollere emnets krympning ved design af emner, forme og processer, is\u00e6r ved anvendelser, der kr\u00e6ver sn\u00e6vre tolerancer. Krympning, der f\u00f8rer til synkem\u00e6rker eller hulrum, kan reduceres eller elimineres ved at pakke hulrummet efter fyldning. Formdesignet skal ogs\u00e5 tage h\u00f8jde for krympning for at tilpasse sig emnets dimensioner. Emnekrympning forudsagt af C-MOLD giver en nyttig retningslinje for korrekt formdesign.<\/p>","protected":false},"excerpt":{"rendered":"<p>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 [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-593","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Chapter 26-1,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\/da\/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=\"da_DK\" \/>\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? 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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 [&hellip;]","og_url":"https:\/\/www.plasticmoldco.com\/da\/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\/","og_site_name":"Plastic Mold | China Mold Maker","article_published_time":"2018-10-16T16:12:11+00:00","og_image":[{"url":"https:\/\/web.archive.org\/web\/20130131102912im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Shrinkage-and-warpage.gif","type":"","width":"","height":""}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"Skrevet af":"admin","Estimeret l\u00e6setid":"2 minutter"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.plasticmoldco.com\/ar\/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\/#article","isPartOf":{"@id":"https:\/\/www.plasticmoldco.com\/ar\/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\/"},"author":{"name":"admin","@id":"https:\/\/www.plasticmoldco.com\/el\/#\/schema\/person\/8377d429cf711f79d68feec3e8648777"},"headline":"Chapter 26-1,Shrinkage and warpage","datePublished":"2018-10-16T16:12:11+00:00","mainEntityOfPage":{"@id":"https:\/\/www.plasticmoldco.com\/ar\/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\/"},"wordCount":419,"commentCount":0,"publisher":{"@id":"https:\/\/www.plasticmoldco.com\/el\/#organization"},"image":{"@id":"https:\/\/www.plasticmoldco.com\/ar\/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\/#primaryimage"},"thumbnailUrl":"https:\/\/web.archive.org\/web\/20130131102912im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Shrinkage-and-warpage.gif","articleSection":["Mould Technology Blog 1"],"inLanguage":"da-DK","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.plasticmoldco.com\/ar\/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\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.plasticmoldco.com\/ar\/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\/","url":"https:\/\/www.plasticmoldco.com\/ar\/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\/","name":"Kapitel 26-1, Krympning og forvridning - 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