{"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\/pl\/2018\/10\/16\/skurcz-i-wypaczenie\/","title":{"rendered":"Kurczenie si\u0119 i wypaczanie"},"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\u2033]<\/p>\n<h2>Dlaczego one wyst\u0119puj\u0105?<\/h2>\n<p>Skurcz jest nieod\u0142\u0105cznym elementem procesu formowania wtryskowego. Skurcz wyst\u0119puje, poniewa\u017c<br \/>\ng\u0119sto\u015b\u0107 polimeru zmienia si\u0119 od temperatury przetwarzania do temperatury otoczenia<br \/>\n(patrz Obj\u0119to\u015b\u0107 w\u0142a\u015bciwa (wykres pvT)). Podczas formowania wtryskowego zmiana skurczu zar\u00f3wno globalnie, jak i w przekroju poprzecznym cz\u0119\u015bci powoduje powstawanie napr\u0119\u017ce\u0144 wewn\u0119trznych. Te tak zwane napr\u0119\u017cenia szcz\u0105tkowe (patrz Napr\u0119\u017cenia szcz\u0105tkowe) dzia\u0142aj\u0105 na cz\u0119\u015b\u0107 z efektami podobnymi do napr\u0119\u017ce\u0144 przy\u0142o\u017conych zewn\u0119trznie. Je\u015bli napr\u0119\u017cenia szcz\u0105tkowe wywo\u0142ane podczas formowania s\u0105 wysokie<br \/>\nwystarczaj\u0105co du\u017co, aby pokona\u0107 integralno\u015b\u0107 strukturaln\u0105 cz\u0119\u015bci, cz\u0119\u015b\u0107 wypaczy si\u0119 po wyrzuceniu<br \/>\nz formy lub p\u0119kni\u0119cie przy zewn\u0119trznym obci\u0105\u017ceniu u\u017cytkowym.<\/p>\n<h2>Skurcz<\/h2>\n<p>Skurcz formowanych cz\u0119\u015bci z tworzyw sztucznych mo\u017ce wynosi\u0107 nawet 20% obj\u0119to\u015bci, mierzony w temperaturze przetwarzania i temperaturze otoczenia. Materia\u0142y krystaliczne i p\u00f3\u0142krystaliczne s\u0105 szczeg\u00f3lnie podatne na skurcz termiczny; materia\u0142y amorficzne maj\u0105 tendencj\u0119 do kurczenia si\u0119 w mniejszym stopniu. Gdy materia\u0142y krystaliczne s\u0105 sch\u0142adzane poni\u017cej ich temperatury przej\u015bcia, cz\u0105steczki uk\u0142adaj\u0105 si\u0119 w bardziej uporz\u0105dkowany spos\u00f3b, tworz\u0105c krystality. Z drugiej strony, mikrostruktura materia\u0142\u00f3w amorficznych nie zmienia si\u0119 wraz z przemian\u0105 fazow\u0105. Ta r\u00f3\u017cnica prowadzi do tego, \u017ce materia\u0142y krystaliczne i p\u00f3\u0142krystaliczne maj\u0105 wi\u0119ksz\u0105 r\u00f3\u017cnic\u0119 w obj\u0119to\u015bci w\u0142a\u015bciwej ( ) mi\u0119dzy faz\u0105 stopion\u0105 a faz\u0105 sta\u0142\u0105 (krystaliczn\u0105). Zosta\u0142o to zilustrowane na rysunku 1 poni\u017cej. Chcieliby\u015bmy podkre\u015bli\u0107, \u017ce szybko\u015b\u0107 ch\u0142odzenia wp\u0142ywa r\u00f3wnie\u017c na zachowanie pvT materia\u0142\u00f3w krystalicznych i p\u00f3\u0142krystalicznych podczas szybkiego ch\u0142odzenia.<\/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=\"Kurczenie si\u0119 i wypaczanie\" src=\"https:\/\/web.archive.org\/web\/20141001102803im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Shrinkage-and-warpage.gif\" alt=\"Kurczenie si\u0119 i wypaczanie\" width=\"632\" height=\"404\" \/><p id=\"caption-attachment-1336\" class=\"wp-caption-text\">nowy<\/p><\/div>\n<p><strong>RYSUNEK 1.<\/strong>\u00a0Krzywe pvT dla polimer\u00f3w amorficznych i krystalicznych oraz zmiany obj\u0119to\u015bci w\u0142a\u015bciwej mi\u0119dzy stanem przetwarzania (punkt A) a stanem w temperaturze pokojowej i ci\u015bnieniu atmosferycznym (punkt B). Nale\u017cy zauwa\u017cy\u0107, \u017ce obj\u0119to\u015b\u0107 w\u0142a\u015bciwa maleje wraz ze wzrostem ci\u015bnienia.<\/p>\n<h3>Przyczyny nadmiernego kurczenia si\u0119 cz\u0119\u015bci<\/h3>\n<p>Nadmierny skurcz, przekraczaj\u0105cy dopuszczalny poziom, mo\u017ce by\u0107 spowodowany nast\u0119puj\u0105cymi czynnikami. Zale\u017cno\u015b\u0107 skurczu od kilku parametr\u00f3w obr\u00f3bki i grubo\u015bci cz\u0119\u015bci przedstawiono schematycznie na rysunku 2.<\/p>\n<p>- niskie ci\u015bnienie wtrysku<br \/>\n- Kr\u00f3tki czas przechowywania lub ch\u0142odzenia opakowania<br \/>\n- wysoka temperatura topnienia<br \/>\n- wysoka temperatura formy<br \/>\n- niskie ci\u015bnienie trzymania.<\/p>\n<h3>Problemy spowodowane kurczeniem si\u0119 cz\u0119\u015bci<\/h3>\n<p>Nieskompensowany skurcz obj\u0119to\u015bciowy prowadzi do powstawania zapadni\u0119\u0107 lub pustych przestrzeni we wn\u0119trzu formy. Kontrolowanie skurczu cz\u0119\u015bci jest wa\u017cne w projektach cz\u0119\u015bci, form i proces\u00f3w, szczeg\u00f3lnie w zastosowaniach wymagaj\u0105cych w\u0105skich tolerancji. Skurcz, kt\u00f3ry prowadzi do powstawania \u015blad\u00f3w zapadni\u0119\u0107 lub pustych przestrzeni, mo\u017cna zmniejszy\u0107 lub wyeliminowa\u0107 poprzez uszczelnienie wn\u0119ki po wype\u0142nieniu. Ponadto projekt formy powinien uwzgl\u0119dnia\u0107 skurcz, aby dopasowa\u0107 si\u0119 do wymiar\u00f3w cz\u0119\u015bci. Skurcz cz\u0119\u015bci przewidywany przez C-MOLD oferuje przydatne wytyczne dla prawid\u0142owego projektowania form.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/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\/pl\/2018\/10\/16\/\uc218\ucd95-\ubc0f-\ub4a4\ud2c0\ub9bc\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\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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