{"id":11515,"date":"2021-07-21T10:16:51","date_gmt":"2021-07-21T08:16:51","guid":{"rendered":"https:\/\/consilab.de\/?page_id=11515"},"modified":"2022-07-11T16:05:17","modified_gmt":"2022-07-11T14:05:17","slug":"determination-de-la-repartition-granulometrique","status":"publish","type":"page","link":"https:\/\/consilab.de\/fr\/prestations\/caracteristiques-des-substances-relevant-de-la-securite\/determination-de-la-repartition-granulometrique\/","title":{"rendered":"D\u00e9termination de la r\u00e9partition granulom\u00e9trique"},"content":{"rendered":"<p>[vc_row rt_row_background_width=\u00a0\u00bbfullwidth\u00a0\u00bb rt_row_content_width=\u00a0\u00bbdefault\u00a0\u00bb rt_row_style=\u00a0\u00bbdefault-style\u00a0\u00bb rt_row_borders=\u00a0\u00bb\u00a0\u00bb rt_row_shadows=\u00a0\u00bb\u00a0\u00bb rt_row_paddings=\u00a0\u00bbtrue\u00a0\u00bb rt_bg_effect=\u00a0\u00bbclassic\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbcover\u00a0\u00bb rt_bg_position=\u00a0\u00bbright top\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb rt_bg_video_format=\u00a0\u00bbself-hosted\u00a0\u00bb][vc_column width=\u00a0\u00bb1\/3&Prime; rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb class=\u00a0\u00bbdownload\u00a0\u00bb rt_bg_color=\u00a0\u00bb\u00a0\u00bb rt_bg_overlay_color=\u00a0\u00bb\u00a0\u00bb offset=\u00a0\u00bbvc_hidden-sm vc_hidden-xs\u00a0\u00bb css=\u00a0\u00bb.vc_custom_1529335398592{padding-bottom: 0px !important;}\u00a0\u00bb rt_padding_bottom=\u00a0\u00bb0&Prime;][vc_widget_sidebar sidebar_id=\u00a0\u00bbrt-theme-20-common-sidebar\u00a0\u00bb][\/vc_column][vc_column width=\u00a0\u00bb2\/3&Prime; rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb class=\u00a0\u00bbmaincontent\u00a0\u00bb rt_bg_color=\u00a0\u00bb\u00a0\u00bb rt_bg_overlay_color=\u00a0\u00bb\u00a0\u00bb css=\u00a0\u00bb.vc_custom_1626263728879{padding-bottom: 0px !important;}\u00a0\u00bb][vc_column_text]<\/p>\n<h1>D\u00e9termination de la r\u00e9partition granulom\u00e9trique<\/h1>\n<h2>La r\u00e9partition granulom\u00e9trique (r\u00e9partition de la taille des particules) est une caract\u00e9ristique importante permettant de classifier les produits pulv\u00e9rulents, car de nombreuses caract\u00e9ristiques relevant de la s\u00e9curit\u00e9 d\u00e9pendent du degr\u00e9 de finesse des poussi\u00e8res.<\/h2>\n<p>La r\u00e9partition granulom\u00e9trique peut \u00eatre d\u00e9termin\u00e9e de diff\u00e9rentes mani\u00e8res, notamment par tamisage ou par diffraction laser. Cette derni\u00e8re m\u00e9thode consiste \u00e0 introduire l\u2019\u00e9chantillon dans un appareil de diffraction par le biais d\u2019une goulotte vibrante charg\u00e9e d\u2019assurer une alimentation continue. Dans l\u2019appareil de mesure, les particules sont dispers\u00e9es dans un flux d\u2019air comprim\u00e9 avant de traverser un faisceau laser. Par la dispersion et l\u2019intensit\u00e9 du laser, l\u2019appareil calcule la r\u00e9partition granulom\u00e9trique de l\u2019\u00e9chantillon ce qui donne alors la valeur moyenne D50. Les interf\u00e9rences entre le laser et les particules d\u00e9pendent de la forme, de la taille et de la surface des particules. De ce fait, il existe plusieurs th\u00e9ories permettant de d\u00e9terminer la r\u00e9partition granulom\u00e9trique par diffraction laser. Pour les particules sph\u00e9riques, on applique la th\u00e9orie de Fraunhofer ou la th\u00e9orie de Mie.<\/p>\n<p>En raison des propri\u00e9t\u00e9s du mat\u00e9riau, il peut s\u2019av\u00e9rer n\u00e9cessaire de disperser et de mesurer l\u2019\u00e9chantillon au moyen d\u2019une cellule de dispersion en phase humide dans des milieux sp\u00e9cifiques. Il est alors possible d\u2019examiner des substances pyrophores, hygroscopiques ou m\u00e9caniquement sensibles.<\/p>\n<p>[\/vc_column_text][vc_single_image image=\u00a0\u00bb11631&Prime; img_size=\u00a0\u00bbfull\u00a0\u00bb][vc_row_inner rt_row_style=\u00a0\u00bbglobal-style\u00a0\u00bb rt_bg_custom_alignment=\u00a0\u00bbtop\u00a0\u00bb][vc_column_inner width=\u00a0\u00bb1\/2&Prime; rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb][vc_btn title=\u00a0\u00bbCaract\u00e9ristiques des substances\u00a0\u00bb style=\u00a0\u00bbclassic\u00a0\u00bb color=\u00a0\u00bbpurple\u00a0\u00bb i_icon_fontawesome=\u00a0\u00bbfas fa-angle-left\u00a0\u00bb add_icon=\u00a0\u00bbtrue\u00a0\u00bb link=\u00a0\u00bburl:%2Ffr%2Fprestations%2Fcaracteristiques-des-substances-relevant-de-la-securite%2F|title:Caract%C3%A9ristiques%20des%20substances\u00a0\u00bb el_class=\u00a0\u00bbbtn&#8211;red\u00a0\u00bb][\/vc_column_inner][vc_column_inner width=\u00a0\u00bb1\/2&Prime; rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb][vc_btn title=\u00a0\u00bbPrestations\u00a0\u00bb style=\u00a0\u00bbclassic\u00a0\u00bb color=\u00a0\u00bbpurple\u00a0\u00bb i_icon_fontawesome=\u00a0\u00bbfas fa-angle-left\u00a0\u00bb add_icon=\u00a0\u00bbtrue\u00a0\u00bb link=\u00a0\u00bburl:%2Ffr%2Fprestations%2F|title:Prestations\u00a0\u00bb el_class=\u00a0\u00bbbtn&#8211;red\u00a0\u00bb][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[vc_row rt_row_background_width=\u00a0\u00bbfullwidth\u00a0\u00bb rt_row_content_width=\u00a0\u00bbdefault\u00a0\u00bb rt_row_style=\u00a0\u00bbdefault-style\u00a0\u00bb rt_row_borders=\u00a0\u00bb\u00a0\u00bb rt_row_shadows=\u00a0\u00bb\u00a0\u00bb rt_row_paddings=\u00a0\u00bbtrue\u00a0\u00bb rt_bg_effect=\u00a0\u00bbclassic\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbcover\u00a0\u00bb rt_bg_position=\u00a0\u00bbright top\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb rt_bg_video_format=\u00a0\u00bbself-hosted\u00a0\u00bb][vc_column width=\u00a0\u00bb1\/3&Prime; rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb class=\u00a0\u00bbdownload\u00a0\u00bb rt_bg_color=\u00a0\u00bb\u00a0\u00bb rt_bg_overlay_color=\u00a0\u00bb\u00a0\u00bb offset=\u00a0\u00bbvc_hidden-sm vc_hidden-xs\u00a0\u00bb css=\u00a0\u00bb.vc_custom_1529335398592{padding-bottom: 0px !important;}\u00a0\u00bb rt_padding_bottom=\u00a0\u00bb0&Prime;][vc_widget_sidebar sidebar_id=\u00a0\u00bbrt-theme-20-common-sidebar\u00a0\u00bb][\/vc_column][vc_column width=\u00a0\u00bb2\/3&Prime; rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb class=\u00a0\u00bbmaincontent\u00a0\u00bb rt_bg_color=\u00a0\u00bb\u00a0\u00bb rt_bg_overlay_color=\u00a0\u00bb\u00a0\u00bb css=\u00a0\u00bb.vc_custom_1626263728879{padding-bottom: 0px !important;}\u00a0\u00bb][vc_column_text] D\u00e9termination de la r\u00e9partition granulom\u00e9trique La r\u00e9partition granulom\u00e9trique (r\u00e9partition de la taille des  &#8230;<br \/><a class=\"more-link\" href=\"https:\/\/consilab.de\/fr\/prestations\/caracteristiques-des-substances-relevant-de-la-securite\/determination-de-la-repartition-granulometrique\/\">more | mehr<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":9313,"menu_order":19,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-11515","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages\/11515","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/comments?post=11515"}],"version-history":[{"count":1,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages\/11515\/revisions"}],"predecessor-version":[{"id":12091,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages\/11515\/revisions\/12091"}],"up":[{"embeddable":true,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages\/9313"}],"wp:attachment":[{"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/media?parent=11515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}