{"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\/fi\/2018\/10\/16\/kutistuminen-ja-vaantyminen\/","title":{"rendered":"Kutistuminen ja v\u00e4\u00e4ntyminen"},"content":{"rendered":"<p>[et_pb_section bb_built=\"1\u2033 fullwidth=\"off\" specialty=\"off\"][et_pb_row][et_pb_column type=\"4_4\u2033][et_pb_text _builder_version=\"3.10.2\u2033 border_width_all=\"3px\" border_color_all=\"#e5e5e5\"]<\/p>\n<h2>Miksi niit\u00e4 esiintyy?<\/h2>\n<p>Kutistuminen on ruiskuvaluprosessin luontainen piirre. Kutistumista tapahtuu, koska<br \/>\npolymeerin tiheys vaihtelee k\u00e4sittelyl\u00e4mp\u00f6tilasta ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tilaan.<br \/>\n(ks. Ominaisvolyymi (pvT-kaavio)). Ruiskuvalun aikana kutistuman vaihtelu sek\u00e4 globaalisti ett\u00e4 kappaleen poikkileikkauksen kautta aiheuttaa sis\u00e4isi\u00e4 j\u00e4nnityksi\u00e4. N\u00e4m\u00e4 niin sanotut j\u00e4\u00e4nn\u00f6sj\u00e4nnitykset (ks. J\u00e4\u00e4nn\u00f6sj\u00e4nnitys) vaikuttavat kappaleeseen samalla tavoin kuin ulkoisesti kohdistuvat j\u00e4nnitykset. Jos valun aikana syntyv\u00e4t j\u00e4\u00e4nn\u00f6sj\u00e4nnitykset ovat suuria.<br \/>\nriitt\u00e4v\u00e4sti, jotta osan rakenteellinen eheys voidaan voittaa, osa v\u00e4\u00e4ntyy ulosheitt\u00e4misen yhteydess\u00e4.<br \/>\nmuotista tai halkeamasta ulkoisen k\u00e4ytt\u00f6kuorman vaikutuksesta.<\/p>\n<h2>Kutistuminen<\/h2>\n<p>Valettujen muoviosien kutistuminen voi olla jopa 20 tilavuusprosenttia, kun se mitataan k\u00e4sittelyl\u00e4mp\u00f6tilassa ja ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tilassa. Kiteiset ja puolikiteiset materiaalit ovat erityisen alttiita l\u00e4mp\u00f6kutistumiselle; amorfiset materiaalit kutistuvat yleens\u00e4 v\u00e4hemm\u00e4n. Kun kiteiset materiaalit j\u00e4\u00e4hdytet\u00e4\u00e4n alle niiden siirtymisl\u00e4mp\u00f6tilan, molekyylit j\u00e4rjest\u00e4ytyv\u00e4t j\u00e4rjest\u00e4ytyneemmiksi muodostaen kiteytymi\u00e4. Toisaalta amorfisten materiaalien mikrorakenne ei muutu faasimuutoksen my\u00f6t\u00e4. T\u00e4m\u00e4 ero johtaa siihen, ett\u00e4 kiteisill\u00e4 ja puolikiteisill\u00e4 materiaaleilla on suurempi ero ominaisvolyymiss\u00e4 ( ) sulan ja kiinte\u00e4n (kiteisen) faasin v\u00e4lill\u00e4. T\u00e4t\u00e4 havainnollistetaan alla olevassa kuvassa 1. Haluamme huomauttaa, ett\u00e4 j\u00e4\u00e4hdytysnopeus vaikuttaa my\u00f6s kiteisten ja puolikiteisten materiaalien nopeasti j\u00e4\u00e4htyv\u00e4\u00e4n pvT-k\u00e4ytt\u00e4ytymiseen.<\/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=\"Kutistuminen ja v\u00e4\u00e4ntyminen\" src=\"https:\/\/web.archive.org\/web\/20141001102803im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Shrinkage-and-warpage.gif\" alt=\"Kutistuminen ja v\u00e4\u00e4ntyminen\" width=\"632\" height=\"404\" \/><p id=\"caption-attachment-1336\" class=\"wp-caption-text\">uusi<\/p><\/div>\n<p><strong>KUVA 1.<\/strong>\u00a0Amorfisten ja kiteisten polymeerien pvT-k\u00e4yr\u00e4t ja ominaisvolyymin vaihtelu k\u00e4sittelytilan (piste A) ja huoneenl\u00e4mp\u00f6tilassa ja ilmanpaineessa vallitsevan tilan (piste B) v\u00e4lill\u00e4. Huomaa, ett\u00e4 ominaisvolyymi pienenee paineen kasvaessa.<\/p>\n<h3>Osan liiallisen kutistumisen syyt<\/h3>\n<p>Liiallinen kutistuminen, joka ylitt\u00e4\u00e4 hyv\u00e4ksytt\u00e4v\u00e4n tason, voi johtua seuraavista tekij\u00f6ist\u00e4. Kutistuman suhde useisiin k\u00e4sittelyparametreihin ja kappaleen paksuuteen on esitetty kaaviomaisesti kuvassa 2.<\/p>\n<p>- alhainen ruiskutuspaine<br \/>\n- lyhyt pakkauksen s\u00e4ilytysaika tai j\u00e4\u00e4hdytysaika<br \/>\n- korkea sulamisl\u00e4mp\u00f6tila<br \/>\n- korkea muotin l\u00e4mp\u00f6tila<br \/>\n- alhainen pitopaine.<\/p>\n<h3>Osien kutistumisen aiheuttamat ongelmat<\/h3>\n<p>Kompensoimaton tilavuuden supistuminen johtaa joko uppoamisj\u00e4lkiin tai tyhji\u00f6ihin muotin sis\u00e4puolella. Kappaleen kutistumisen hallinta on t\u00e4rke\u00e4\u00e4 kappaleen, muotin ja prosessin suunnittelussa, erityisesti sovelluksissa, joissa vaaditaan tiukkoja toleransseja. Kutistumista, joka johtaa uppoumiin tai tyhji\u00f6ihin, voidaan v\u00e4hent\u00e4\u00e4 tai poistaa pakkaamalla ontelo t\u00e4yt\u00f6n j\u00e4lkeen. My\u00f6s muotin suunnittelussa on otettava huomioon kutistuminen, jotta se vastaisi kappaleen mittoja. C-MOLDin ennustama kappaleen kutistuma tarjoaa hy\u00f6dyllisen ohjeen muotin oikeaa suunnittelua varten.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][\/et_pb_section][\/et_pb_section]<\/p>","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>","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 v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\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\/fi\/2018\/10\/16\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\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? 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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. 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