{"id":19323,"date":"2022-09-14T02:05:31","date_gmt":"2022-09-14T02:05:31","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=19323"},"modified":"2022-09-14T02:17:16","modified_gmt":"2022-09-14T02:17:16","slug":"deep-bed-filters","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/deep-bed-filters\/","title":{"rendered":"filtres \u00e0 lit profond"},"content":{"rendered":"

\u201cfiltres \u00e0 lit profond<\/a>\u201d<\/p>\n

\"filtres
filtres \u00e0 lit profond<\/figcaption><\/figure>\n

Un autre crit\u00e8re permettant d'\u00e9valuer les performances d'une mousse est sa porosit\u00e9, qui correspond au rapport entre le volume des cellules ouvertes de la mousse et le volume total de celle-ci, g\u00e9n\u00e9ralement exprim\u00e9 en pourcentage. L'exp\u00e9rience montre que la porosit\u00e9 d'une m\u00eame mousse pr\u00e9sentant diff\u00e9rents indices PPI est tr\u00e8s proche. La m\u00e9thode de calcul de la porosit\u00e9 est la suivante.<\/p>\n

P = (A - B) \/ A \u00d7 100%<\/p>\n

P-Porosit\u00e9<\/p>\n

Poids de l'A-Foam sans cellules ouvertes<\/p>\n

Poids de la mousse B apr\u00e8s ouverture<\/p>\n

\"\"<\/p>\n

Figure 1 : Sch\u00e9ma repr\u00e9sentant les caract\u00e9ristiques de la mousse<\/p>\n

\"\"<\/p>\n

Figure 2 : Sch\u00e9ma de principe de la m\u00e9thode du flux d'air<\/p>\n

Tableau 1 : Exemples de pores de diff\u00e9rentes tailles dans une mousse de 17 pouces<\/p>\n

\"\"<\/p>\n

Outre les probl\u00e8mes mentionn\u00e9s ci-dessus, les mousses produites localement pr\u00e9sentent \u00e9galement des alv\u00e9oles de tailles vari\u00e9es et de formes irr\u00e9guli\u00e8res. Par cons\u00e9quent, lorsqu\u2019un m\u00eame morceau de mousse est d\u00e9coup\u00e9 dans diff\u00e9rentes directions, la surface affichera un \u201c PPI \u201d diff\u00e9rent, et ce m\u00eame morceau de mousse pr\u00e9sentera des surfaces diff\u00e9rentes. La taille des alv\u00e9oles varie \u00e9galement. \u00c0 l'heure actuelle, il n'existe en Chine aucun instrument permettant de mesurer la perm\u00e9abilit\u00e9 \u00e0 l'air de la mousse. Les sp\u00e9cifications techniques de la mousse reposent toujours sur la m\u00e9thode de mesure traditionnelle. Les sp\u00e9cifications fournies par le fabricant ne peuvent donc servir que de r\u00e9f\u00e9rence. unit\u00e9 de d\u00e9gazage<\/a><\/p>\n

1.2 Les propri\u00e9t\u00e9s m\u00e9caniques et la qualit\u00e9 de surface de la plaque filtrante en c\u00e9ramique pour boues sont directement li\u00e9es \u00e0 la composition de la boue. Les exigences g\u00e9n\u00e9rales relatives \u00e0 la boue utilis\u00e9e pour la fabrication de la filtre en c\u00e9ramique poreuse<\/a>: (1) Elle doit pr\u00e9senter une viscosit\u00e9 appropri\u00e9e ; si celle-ci est trop faible et que la boue absorb\u00e9e par la mousse est insuffisante, cela entra\u00eenera une diminution de la r\u00e9sistance de la plaque filtrante et une baisse de sa densit\u00e9 ; en revanche, si la viscosit\u00e9 est trop \u00e9lev\u00e9e, la r\u00e9sistance s'en trouve certes am\u00e9lior\u00e9e, mais cela entra\u00eene la formation d'un trop grand nombre de pores morts et peut m\u00eame provoquer la chute de scories \u00e0 la surface. Si elle est trop \u00e9lev\u00e9e ou trop faible, il convient de l'ajuster \u00e0 temps. (2) La boue doit pr\u00e9senter une certaine fluidit\u00e9 afin de garantir qu\u2019elle puisse \u00eatre facilement inject\u00e9e et \u00e9vacu\u00e9e lors de l\u2019impr\u00e9gnation de la mousse. (3) Les principales mati\u00e8res premi\u00e8res composant la boue doivent pr\u00e9senter un certain degr\u00e9 d\u2019hydrophilie afin de garantir que la boue forme une suspension homog\u00e8ne. Si l\u2019hydrophilie est insuffisante, les solides pr\u00e9sents dans la boue pr\u00e9cipiteront facilement et resteront dans la mousse pendant le processus d\u2019immersion, ce qui entra\u00eenera la formation de pores morts et une fragilit\u00e9 accrue de la plaque filtrante. Les caract\u00e9ristiques techniques des ingr\u00e9dients et des mati\u00e8res premi\u00e8res ont une influence d\u00e9terminante sur les performances de la boue. M\u00eame si une m\u00eame mati\u00e8re premi\u00e8re pr\u00e9sente des caract\u00e9ristiques l\u00e9g\u00e8rement diff\u00e9rentes, la r\u00e9sistance \u00e0 la d\u00e9formation, la r\u00e9sistance \u00e0 la compression et la fragilit\u00e9 de surface des produits finis seront tr\u00e8s diff\u00e9rentes.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

“deep bed filters” Another measure of foam performance is the porosity of the foam, which is the ratio of the volume of the open cells…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[13243],"class_list":["post-19323","post","type-post","status-publish","format-standard","hentry","category-blog","tag-deep-bed-filters"],"yoast_head":"\ndeep bed filters, degassing unit, porous ceramic filter<\/title>\n<meta name=\"description\" content=\"deep bed filters, In addition to the problems mentioned above, domestic foams also have holes of different sizes and irregular shapes.\" \/>\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.alalloycasting.com\/fr\/deep-bed-filters\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" 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