{"id":233,"date":"2021-01-20T22:15:35","date_gmt":"2021-01-20T22:15:35","guid":{"rendered":"https:\/\/www.purhotmelt.com\/?page_id=233"},"modified":"2021-01-20T22:15:36","modified_gmt":"2021-01-20T22:15:36","slug":"hot-melt-definition","status":"publish","type":"page","link":"https:\/\/www.purhotmelt.com\/fr\/hot-melt-definition\/","title":{"rendered":"D\u00c9FINITION DE LA FUSION \u00c0 CHAUD"},"content":{"rendered":"<h1 class=\"wp-block-heading\"><\/h1>\n\n\n\n<p>Le thermofusible est un adh\u00e9sif, avec des solides 100%. Il est appliqu\u00e9 \u00e0 l&#039;\u00e9tat fondu et devient plus fort avec le refroidissement \u00e0 temp\u00e9rature ambiante. En raison de la grande diff\u00e9rence entre la temp\u00e9rature d&#039;application, commune autour de 160 \u00b0 C, et la temp\u00e9rature ambiante, 20 \u00b0 C, les adh\u00e9sifs thermofusibles sont \u00e0 prise rapide<strong>.<\/strong><\/p>\n\n\n\n<p>En utilisant cette fonction, il est important de conna\u00eetre les propri\u00e9t\u00e9s et param\u00e8tres critiques des adh\u00e9sifs thermofusibles.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">LES ADH\u00c9SIFS STANDARDS \u00c0 CHAUD SONT THERMOPLASTIQUES<\/h2>\n\n\n\n<p>La plupart des adh\u00e9sifs thermofusibles sont \u00e0 base d&#039;EVA ou de PO (polyol\u00e9fine, m\u00e9talloc\u00e8ne). Dans la plupart des formulations, ces adh\u00e9sifs contiennent une quantit\u00e9 consid\u00e9rable de r\u00e9sines collantes et de cires. Les r\u00e9sines adh\u00e9sives am\u00e9lioreront l&#039;adh\u00e9rence et la r\u00e9sistance verte d&#039;un adh\u00e9sif. Les cires sont principalement ajout\u00e9es pour diminuer la viscosit\u00e9 \u00e0 des fins d&#039;application et pour acc\u00e9l\u00e9rer la prise finale du thermofusible.<\/p>\n\n\n\n<p>Certaines autres qualit\u00e9s thermpoplastiques peuvent \u00eatre des adh\u00e9sifs thermofusibles PolyAmide ou PolyEsther. Ces qualit\u00e9s typiques ne sont g\u00e9n\u00e9ralement pas un m\u00e9lange de polym\u00e8res.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ADH\u00c9SIFS R\u00c9ACTIFS \u00c0 CHAUD (PUR)<\/h2>\n\n\n\n<p>L&#039;adh\u00e9sif thermofusible PUR combine la prise rapide de l&#039;adh\u00e9sif thermofusible \u00e0 l&#039;adh\u00e9rence durable d&#039;un adh\u00e9sif durcissant. La plupart des adh\u00e9sifs thermofusibles r\u00e9actifs sont \u00e0 base de PUR (polyur\u00e9thane). Les adh\u00e9sifs polyur\u00e9thane ne sont pas un m\u00e9lange typique, mais plut\u00f4t un polym\u00e8re avec quelques additifs mineurs comme promoteurs d&#039;adh\u00e9rence, antioxydants, stabilisants UV et retardateurs de flamme. Ces additifs peuvent ajouter de la valeur \u00e0 la liaison l\u00e0 o\u00f9 d\u00e9j\u00e0 un PUR thermofusible \u00e9tait apparemment n\u00e9cessaire pour cr\u00e9er une liaison plus durable. Un groupe sp\u00e9cial d&#039;adh\u00e9sifs thermofusibles r\u00e9actifs sont les adh\u00e9sifs thermofusibles POR.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">INFLUENCES ET R\u00c9GLAGES DE TEMP\u00c9RATURE<\/h2>\n\n\n\n<p>La temp\u00e9rature est un param\u00e8tre tr\u00e8s important pour les adh\u00e9sifs thermofusibles. La temp\u00e9rature de l&#039;adh\u00e9sif thermofusible lui-m\u00eame est importante pour une bonne application et une bonne capacit\u00e9 de fonctionnement de la machine. La temp\u00e9rature du substrat peut \u00eatre trop \u00e9lev\u00e9e, entra\u00eenant une vitesse de prise lente, ou trop basse, ce qui peut entra\u00eener une mauvaise liaison. De plus, les liaisons r\u00e9alis\u00e9es par les adh\u00e9sifs thermofusibles peuvent \u00eatre influenc\u00e9es par des temp\u00e9ratures \u00e9lev\u00e9es ou basses. \u00c0 des temp\u00e9ratures \u00e9lev\u00e9es, les liaisons peuvent devenir plus flexibles et finalement \u00e9chouer. Pour les adh\u00e9sifs thermofusibles thermoplastiques, les temp\u00e9ratures critiques peuvent varier typiquement de + 40 \u00b0 C \u00e0 + 90 \u00b0 C, bien entendu en fonction du grade thermofusible utilis\u00e9. Des temp\u00e9ratures critiques peuvent \u00e9galement \u00eatre affront\u00e9es \u00e0 partir de -40 \u00b0<strong>C<\/strong>&nbsp;jusqu&#039;\u00e0 + 5 \u00b0 C, car les adh\u00e9sifs thermofusibles peuvent perdre leur flexibilit\u00e9 et donc se fissurer facilement et adh\u00e9rer mal aux substrats<strong>.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">PARAM\u00c8TRES TYPIQUES DES ADH\u00c9SIFS \u00c0 CHAUD<\/h2>\n\n\n\n<p>Les param\u00e8tres les plus typiques des adh\u00e9sifs thermofusibles sont son point de fusion et sa viscosit\u00e9. Ce sont des param\u00e8tres standards mentionn\u00e9s sur les fiches techniques. D&#039;autres propri\u00e9t\u00e9s sp\u00e9cifiques sont le temps ouvert, la vitesse de prise et la force d&#039;adh\u00e9rence, mais ces valeurs d\u00e9pendent des substrats et de l&#039;environnement d&#039;application.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hot melt is an adhesive, with 100% solids. It\u2019s applied in molten state and becomes stronger [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-233","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HOT MELT DEFINITION - PUR hot melt adhesives<\/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.purhotmelt.com\/fr\/hot-melt-definition\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HOT MELT DEFINITION - PUR hot melt adhesives\" \/>\n<meta property=\"og:description\" content=\"Hot melt is an adhesive, with 100% solids. 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