{"id":509,"date":"2018-10-16T21:45:19","date_gmt":"2018-10-16T13:45:19","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=509"},"modified":"2018-10-20T01:25:01","modified_gmt":"2018-10-19T17:25:01","slug":"what-is-injection-molding","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/nb\/2018\/10\/16\/hva-er-sproytestoping\/","title":{"rendered":"hva er spr\u00f8ytest\u00f8ping"},"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][et_pb_text<\/p>\n<h1>hva er spr\u00f8ytest\u00f8ping<\/h1>\n<p>I filmen The Graduate fra 1967 ga Mr. Robinson ett eneste karrierer\u00e5d til Benjamin Braddock, spilt av Dustin Hoffman: \"<strong>Plast<\/strong>.\" Det ser ut til at Robinson hadde rett. Den industrielle vitenskapen om \u00e5 omdanne plastharpikser til nyttige ting gjennom spr\u00f8ytest\u00f8ping har hatt en enorm innvirkning p\u00e5 industrien og p\u00e5 de fleste av v\u00e5re liv.<\/p>\n<p>Den\u00a0<strong>spr\u00f8ytest\u00f8pingsprosessen<\/strong>\u00a0ble f\u00f8rst utviklet p\u00e5 1930-tallet og var opprinnelig basert p\u00e5 design fra metallst\u00f8ping. Spr\u00f8ytest\u00f8ping har mange fordeler i forhold til alternative produksjonsmetoder, blant annet minimalt svinn p\u00e5 grunn av skrap (siden skrapstykker kan smeltes om og resirkuleres) og minimale krav til etterbehandling. Spr\u00f8ytest\u00f8ping skiller seg fra metallst\u00f8ping ved at smeltet metall ganske enkelt kan helles, mens plastharpikser m\u00e5 injiseres med kraft.<\/p>\n<p>Prosessen bruker store\u00a0<strong>spr\u00f8ytest\u00f8pemaskiner<\/strong>som f\u00f8rer harpiksen gjennom seks hovedprosesser for \u00e5 produsere alt fra datamaskindeler til Halloween-edderkopper i plast. Selv om en spr\u00f8ytest\u00f8pemaskin er en kompleks maskin, best\u00e5r den av to grunnleggende elementer: injeksjonsenheten og fastspenningsenheten.<\/p>\n<p>Prosessen starter med en form som klemmes fast under trykk for \u00e5 gi plass til injeksjons- og avkj\u00f8lingsprosessen. Deretter mates pelleterte harpikser inn i maskinen, etterfulgt av passende fargestoffer. Harpiksen faller deretter ned i en injeksjonst\u00f8nne, hvor den varmes opp til smeltepunktet, f\u00f8r den spr\u00f8ytes inn i formen gjennom enten en skrue eller en stampeanordning.<\/p>\n<p>Deretter kommer boligfasen, der den smeltede plasten befinner seg i formen, og hydraulisk eller mekanisk trykk p\u00e5f\u00f8res for \u00e5 sikre at alle hulrommene i formen er fylt. Plasten f\u00e5r deretter kj\u00f8le seg ned i formen, som deretter \u00e5pnes ved \u00e5 skille de to halvdelene av formen. I det siste trinnet st\u00f8pes plastdelen ut av formen med utst\u00f8tingspinner. Den ferdige delen kan inneholde overfl\u00f8dige biter, s\u00e5kalte medl\u00f8pere, som trimmes av og resirkuleres. Hele prosessen er syklisk, med syklustider p\u00e5 mellom ti og 100 sekunder, avhengig av hvor lang nedkj\u00f8lingstid som kreves.<\/p>\n<p>Spr\u00f8ytest\u00f8pingsprosessen krever noen komplekse beregninger. Alle ulike typer harpiks har en krympeverdi som m\u00e5 tas med i beregningen, og formen m\u00e5 kompensere for dette. Hvis denne verdien ikke er n\u00f8yaktig bestemt, vil sluttproduktet f\u00e5 feil st\u00f8rrelse eller inneholde feil. Vanligvis kompenseres det for dette ved f\u00f8rst \u00e5 fylle formen med resin, holde den under trykk og deretter tilsette mer resin for \u00e5 kompensere for sammentrekningen. Andre komplikasjoner kan v\u00e6re brente deler som f\u00f8lge av at smeltetemperaturen er satt for h\u00f8yt, skjevheter som f\u00f8lge av ujevn overflatetemperatur, eller ufullstendig fylling p\u00e5 grunn av for langsom innspr\u00f8yting.<\/p>\n<p><strong>Spr\u00f8ytest\u00f8peformer<\/strong>\u00a0selv kan v\u00e6re overraskende dyre, noen ganger opp mot $100 000. Hvis det \u00f8nskede antallet deler er stort nok, blir imidlertid formkostnadene relativt ubetydelige, og de resulterende plastdelene er sv\u00e6rt rimelige. Noen st\u00f8peformer har mer enn \u00e9n kavitet, og disse formene koster mer enn st\u00f8peformer med \u00e9n kavitet, men p\u00e5 grunn av \u00f8kt produksjonseffektivitet blir kostnaden per del minimert.<\/p>\n<p><strong>Spr\u00f8ytest\u00f8ping<\/strong>\u00a0kan brukes med en rekke ulike plastharpikser. De mest popul\u00e6re harpiksene for denne typen st\u00f8ping er: polypropylen (PP), polyetylen (PE) og ABS. Hver harpiks har sine egne fordeler og ulemper og velges ut fra de \u00f8nskede egenskapene til den endelige delen.<\/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> hva er spr\u00f8ytest\u00f8ping I filmen The Graduate fra 1967 ga Mr. Robinson ett eneste karrierer\u00e5d til Benjamin Braddock, spilt av Dustin Hoffman: \u201cPlastics\u201d. Det ser ut til at Robinson hadde rett. Den industrielle vitenskapen om \u00e5 omdanne plastharpikser til nyttige ting gjennom spr\u00f8ytest\u00f8ping, har [...].<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[13,9],"tags":[],"class_list":["post-509","post","type-post","status-publish","format-standard","hentry","category-mold-indstry-blogy-1","category-news2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>what is injection molding - 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\/nb\/2018\/10\/16\/hva-er-sproytestoping\/\" \/>\n<meta property=\"og:locale\" content=\"nb_NO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"what is injection molding - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"what is injection molding In 1967 film The Graduate, Mr. Robinson offered a single word of career advice to Benjamin Braddock, the character played by Dustin Hoffman: \u201cPlastics.\u201d It would seem that Robinson had the right idea. 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