{"id":42748,"date":"2021-11-25T10:26:53","date_gmt":"2021-11-25T08:26:53","guid":{"rendered":"https:\/\/muovia.com\/?p=42748"},"modified":"2021-12-09T17:00:12","modified_gmt":"2021-12-09T15:00:12","slug":"allman-information-om-plast","status":"publish","type":"post","link":"https:\/\/muovia.com\/sv\/allman-information-om-plast\/","title":{"rendered":"Allm\u00e4n information om plast"},"content":{"rendered":"\n<p>Liksom metaller utg\u00f6r alla plaster en stor r\u00e5varugrupp och deras egenskaper skiljer sig avsev\u00e4rt fr\u00e5n varandra. De finns ett trettiotal s\u00e5 kallade <strong>basplaster<\/strong> (PE, PA, POM, PC, PMMA osv.). Av dessa tillverkas sedan plaster med hj\u00e4lp av olika tillsatser f\u00f6r olika anv\u00e4ndnings\u00e4ndam\u00e5l och d\u00e5 stiger antalet till hundratals. Tillsatser \u00e4r bland annat molybdensulfid (MOS2), olika sm\u00f6rjmedel, kol- eller glasfiber, olika stabilisatorer, f\u00e4rg\u00e4mnen osv. Dessa \u00f6kar plasternas anv\u00e4ndningsm\u00f6jligheter, men f\u00f6rsv\u00e5rar samtidigt valet av r\u00e5vara.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><br><strong><strong>PLASTERNAS EGENSKAPER&nbsp;<\/strong><\/strong><\/h3>\n\n\n\n<p>Plasternas egenskaper \u00e4r:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>l\u00e4tthet<\/li><li>h\u00f6g mekanisk styrka<\/li><li>l\u00e5g friktionskoefficient<\/li><li>god korrosionsresistens<\/li><li>god kemikalieresistens<\/li><li>god isoleringsf\u00f6rm\u00e5ga<\/li><li>maskinbearbetbarhet och formbarhet<\/li><li>\u00e5ng- och gasimpermeabilitet eller -permeabilitet<\/li><li>br\u00e4nnbarhet eller obr\u00e4nnbarhet&nbsp;<\/li><\/ul>\n\n\n\n<p>D\u00e5liga egenskaper \u00e4r temperaturk\u00e4nslighet och krypning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">INDELNING AV PLASTER I GRUPPER<\/h3>\n\n\n\n<p>Plaster kan indelas i grupper p\u00e5 flera olika s\u00e4tt. Den mest k\u00e4nda indelningen bygger p\u00e5 <strong>fysikaliska egenskaper<\/strong>, det vill s\u00e4ga <strong>termoplaster<\/strong>&nbsp;(t.ex. PE, PP, ABS och PC) och&nbsp;<strong>h\u00e4rdplaster<\/strong>&nbsp;(t.ex. PF och PUR).&nbsp;<\/p>\n\n\n\n<p>Tillverkarna delar in plasterna <strong>enligt anv\u00e4ndning i volymplaster<\/strong>&nbsp;(PE, PP, PVC, PET, PS),&nbsp;<strong>tekniska plaster<\/strong>&nbsp;(t.ex. PA, POM och PTFE) och&nbsp;<strong>specialplaster<\/strong>&nbsp;(t.ex. PEEK och PEI). Det finns flera indelningss\u00e4tt beroende p\u00e5 k\u00e4lla.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">FYSIKALISK INDELNING<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Termoplaster<\/strong><\/h4>\n\n\n\n<p>Plasterna \u00e4r uppbyggda av l\u00e5nga f\u00f6rgrenade eller linj\u00e4ra polymerkedjor. N\u00e4r termoplaster v\u00e4rms upp mjuknar produkten och blir s\u00e5 sm\u00e5ningom till en visk\u00f6s v\u00e4tska och de tv\u00e4rg\u00e5ende sekund\u00e4ra bindningarna bryts. Av denna orsak kan <strong>termoplaster sm\u00e4ltas, stelnas och omarbetas upprepade g\u00e5nger.<\/strong>&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>H\u00e4rdplaster<\/strong><\/h4>\n\n\n\n<p>Polymerkedjorna \u00e4r sammanfl\u00e4tade med varandra med hj\u00e4lp av b\u00e5de l\u00e4ngsg\u00e5ende och tv\u00e4rg\u00e5ende bindningar och detta kallas f\u00f6r tv\u00e4rbindning. Ett tredimensionellt n\u00e4tverk ger h\u00e4rdplasterna en god mekanisk h\u00e5llbarhet och v\u00e4rmebest\u00e4ndighet. \u00c5 andra sidan kan kedjorna p\u00e5 grund av sin struktur inte l\u00f6sg\u00f6ras fr\u00e5n varandra genom uppv\u00e4rmning p\u00e5 samma s\u00e4tt som termoplasterna, det vill s\u00e4ga <strong>h\u00e4rdplasterna kan formas en g\u00e5ng,<\/strong> och kan inte omformas p\u00e5 nytt utan att den kemiska strukturen bryts ned.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>IDENTIFIERING AV PLASTER<\/strong><\/h3>\n\n\n\n<p>Plasterna \u00e4r till st\u00f6rsta delen mycket lika till det yttre och det kan vara sv\u00e5rt att identifiera dem. Det finns emellertid s\u00e4tt p\u00e5 vilka basplasterna och en del av de tekniska plasterna kan identifieras relativt l\u00e4tt. Plasternas egenskaper, s\u00e5som utseende, vikt, f\u00e4rg, br\u00e4nnbarhet och lukt, \u00e4r till hj\u00e4lp.&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Tillverkningsmetoder f\u00f6r termoplastprodukter<\/strong><\/h4>\n\n\n\n<p>Det finns flera tillverkningsmetoder f\u00f6r plast, bland annat formsprutning, extrudering, termoformning, rotationsgjutning, vakuumformning och traditionell sp\u00e5nsk\u00e4rande bearbetning.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><br><strong>Tekniker f\u00f6r att sammanfoga plaster<\/strong><\/h4>\n\n\n\n<p>Det finns stora materialspecifika skillnader i teknikerna f\u00f6r att sammanfoga plaster, men allm\u00e4nt taget kan de sammanfogas med samma metoder som metaller, det vill s\u00e4ga genom limning, svetsning och mekaniskt, till exempel med skruvar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Liksom metaller utg\u00f6r alla plaster en stor r\u00e5varugrupp och deras egenskaper skiljer sig avsev\u00e4rt fr\u00e5n varandra. De finns ett trettiotal s\u00e5 kallade basplaster (PE, PA, POM, PC, PMMA osv.). Av [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":85207,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"42374,42403,42742,42409,42726,42734","_relevanssi_noindex_reason":"","footnotes":""},"categories":[623],"tags":[],"class_list":["post-42748","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allman"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Allm\u00e4n information om plast - Muovia.com<\/title>\n<meta name=\"description\" content=\"Plaster \u00e4r en stor r\u00e5varugrupp. H\u00e4rifr\u00e5n h\u00e4mtar du information om sortering av plast till basplaster, tekniska plaster och specialplaster och om egenskaper av olika plastslag.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/muovia.com\/sv\/allman-information-om-plast\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Allm\u00e4n information om plast - 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