{"id":21,"date":"2024-04-29T11:23:59","date_gmt":"2024-04-29T09:23:59","guid":{"rendered":"https:\/\/www2.203104.numlog.fr\/?page_id=21"},"modified":"2024-08-28T11:05:07","modified_gmt":"2024-08-28T09:05:07","slug":"technologie-criblage","status":"publish","type":"page","link":"https:\/\/www2.203104.numlog.fr\/ro\/technologie-criblage\/","title":{"rendered":"TEHNOLOGII DE SCREENING"},"content":{"rendered":"<div class=\"wp-block-group has-global-padding is-layout-constrained wp-container-core-group-is-layout-1 wp-block-group-is-layout-constrained\" style=\"padding-right:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--50)\" data-block-type=\"core\">\n<p>Pour bien choisir sa toile de crible, il faut comprendre comment elle s\u2019use. A l\u2019emploi, les grilles sous l\u2019effet de l\u2019abrasion des mat\u00e9riaux tendent \u00e0 s\u2019aplanir en \u00e9rodant les reliefs. La tenue \u00e0 l\u2019abrasion pour lutter contre l\u2019usure des m\u00e9dias criblants est donc un objectif primordial dans ce choix. Plusieurs variables entrent alors en compte :<\/p>\n\n\n\n<ol class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Tipul de materiale utilizate pentru fabricarea sitelor de cernere: <a href=\"\/ro\/solutions\/technologie-acier\/\">metal<\/a> vs <a href=\"\/ro\/solutions\/technologie-synthetique\/\">sintetic<\/a><\/li>\n\n\n\n<li data-block-type=\"core\">Aspectul suprafe\u021bei care intr\u0103 \u00een contact cu produsul care urmeaz\u0103 s\u0103 fie ecranat<\/li>\n\n\n\n<li data-block-type=\"core\">Calitatea sculelor \u0219i a procesului de fabricare a \u021bes\u0103turilor de screening<\/li>\n<\/ol>\n\n\n\n<details class=\"wp-block-stackable-accordion stk-block-accordion stk-inner-blocks stk-block-content stk--is-open stk-block stk-6032f68 is-style-default\" open data-block-id=\"6032f68\"><style>.stk-6032f68{border-style:solid !important;border-color:#e5e5e5 !important;border-top-width:1px !important;border-right-width:1px !important;border-bottom-width:1px !important;border-left-width:1px !important;margin-top:20px !important;margin-bottom:0px !important}<\/style>\n<summary class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-8372753 stk--container-small stk-block-accordion__heading\" data-v=\"4\" data-block-id=\"8372753\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-8372753-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-8372753-inner-blocks\">\n<div class=\"wp-block-stackable-icon-label stk-block-icon-label stk-block stk-98a574e\" data-block-id=\"98a574e\"><div class=\"stk-row stk-inner-blocks stk-block-content\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-7fc503f\" id=\"comment-choisir-la-bonne-toile-de-criblage-en-acier\" data-block-id=\"7fc503f\"><h4 class=\"stk-block-heading__text\">Cum s\u0103 alege\u021bi plasa de ecran din o\u021bel potrivit\u0103?<\/h4><\/div>\n\n\n\n<div class=\"wp-block-stackable-icon stk-block-icon stk-block stk-e4b32db\" data-block-id=\"e4b32db\"><span class=\"stk--svg-wrapper\"><div class=\"stk--inner-svg\"><svg style=\"height:0;width:0\"><defs><lineargradient id=\"linear-gradient-e4b32db\" x1=\"0\" x2=\"100%\" y1=\"0\" y2=\"0\"><stop offset=\"0%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-e-4-b-32-db-color-1)\"><\/stop><stop offset=\"100%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-e-4-b-32-db-color-2)\"><\/stop><\/lineargradient><\/defs><\/svg><svg data-prefix=\"fas\" data-icon=\"chevron-down\" class=\"svg-inline--fa fa-chevron-down fa-w-14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 448 512\" aria-hidden=\"true\" width=\"32\" height=\"32\"><path fill=\"currentColor\" d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div><\/span><\/div>\n<\/div><\/div>\n<\/div><\/div><\/summary>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-63dd412 stk-block-accordion__content\" data-v=\"4\" data-block-id=\"63dd412\"><style>.stk-63dd412-container{margin-top:0px !important;margin-right:0px !important;margin-bottom:0px !important;margin-left:0px !important}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-63dd412-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-63dd412-inner-blocks\">\n<h3 class=\"wp-block-heading\" data-block-type=\"core\">Alegerea o\u021belului<\/h3>\n\n\n\n<p>Un standard ISO define\u0219te condi\u021biile prealabile pentru fabricarea p\u00e2nzelor de ecranare (toleran\u021be, cerin\u021be, metode de verificare etc.). Denumirea european\u0103 de p\u00e2nz\u0103 din s\u00e2rm\u0103 de o\u021bel de \u00eenalt\u0103 rezisten\u021b\u0103 poate duce la confuzie, deoarece este acceptat\u0103 pentru s\u00e2rmele cu o rezisten\u021b\u0103 de peste 80 kg\/mm\u00b2. Numai aceast\u0103 denumire nu este suficient\u0103 pentru a face comparabile p\u00e2nzele de ecranare de la diferi\u021bi produc\u0103tori.<\/p>\n\n\n\n<p>Majoritatea p\u00e2nzelor de ecranare \u021besute \u00een prezent sunt fabricate din aceea\u0219i calitate de s\u00e2rm\u0103 de o\u021bel, cunoscut\u0103 sub denumirea de \"s\u00e2rm\u0103 de ecranare\". Acesta este de fapt o\u021bel carbon, foarte asem\u0103n\u0103tor cu s\u00e2rma de o\u021bel pentru arcuri, a c\u0103rei rezisten\u021b\u0103 final\u0103 este ob\u021binut\u0103 \u00een timpul procesului de tragere la rece.<\/p>\n\n\n\n<p>Pentru fabricarea \u021bes\u0103turilor sale de screening, <strong>GIRON a selectat o\u021beluri cu caracteristici optimizate <\/strong>combin\u00e2nd un con\u021binut de carbon de cel pu\u021bin 0,5% pentru a garanta o rezisten\u021b\u0103 ridicat\u0103 la uzur\u0103 \u0219i o rezisten\u021b\u0103 ridicat\u0103 la absorb\u021bie f\u0103r\u0103 fragilitate:<\/p>\n\n\n\n<ol class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Deforma\u021biile necesare pentru preformarea firelor \u00eenainte de \u021besere<\/li>\n\n\n\n<li data-block-type=\"core\">Tensiuni mecanice cauzate de vibra\u021biile ecranului, chiar \u0219i la energii ridicate<\/li>\n\n\n\n<li data-block-type=\"core\">\u0218ocuri de la materiale \u0219i produse care trec peste grile<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" data-block-type=\"core\">Aspectul suprafe\u021bei rezultate \u00een urma preform\u0103rii<\/h3>\n\n\n\n<p>Dup\u0103 cum am spus, uzura abraziv\u0103 apare atunci c\u00e2nd materialele se freac\u0103 de suprafa\u021ba de criblare. Prin urmare, este u\u0219or de observat c\u0103, cu c\u00e2t suprafa\u021ba este mai plat\u0103, cu at\u00e2t produsul care urmeaz\u0103 s\u0103 fie cernut va trebui s\u0103 ron\u021b\u0103ie mai pu\u021bin.&nbsp;<\/p>\n\n\n\n<p>Prin urmare, tipul de preformare este foarte important pentru reducerea uzurii p\u00e2nzelor de criblat, a c\u0103ror durat\u0103 de via\u021b\u0103 depinde de cantitatea de material care poate fi uzat\u0103 f\u0103r\u0103 ca ochiurile s\u0103 se deformeze sau firele s\u0103 se sl\u0103beasc\u0103.<\/p>\n\n\n\n<p>1. Preform\u0103 \"val simplu\" (model : <a href=\"https:\/\/www2.203104.numlog.fr\/ro\/produits\/toiles-classiques\/\" data-type=\"produits\" data-id=\"36\">Grilgirco<\/a>)<\/p>\n\n\n\n<p>Aceast\u0103 preform\u0103 corespunde formelor A, B \u0219i C definite de ISO4783\/3. Este cea mai elementar\u0103 form\u0103 de ondulare a s\u00e2rmei. Opera\u021biunea const\u0103 \u00een deformarea s\u00e2rmei de o\u021bel \u00eentr-o form\u0103 sinusoidal\u0103 simpl\u0103.<\/p>\n\n\n\n<p>\u021aesutul acestor fire (urzeal\u0103 \u0219i b\u0103t\u0103tur\u0103) produce o suprafa\u021b\u0103 format\u0103 din denivel\u0103ri \u0219i goluri, cu o diferen\u021b\u0103 de nivel egal\u0103 cu diametrul firului.<\/p>\n\n\n\n<p>Din cauza unghiului de \u00eenchidere relativ deschis la nivelul onduleurilor, acest tip de preform\u0103 este evident mai sensibil la impact cu c\u00e2t raportul ochiuri\/fire este mai mare.<\/p>\n\n\n\n<p>\u00cen plus, sub efectul abraziunii, eroziunea sau uzura capetelor ondulate (protuberan\u021be) \u00eempiedic\u0103 avansarea produselor \u0219i duce la ruperea firelor \u00eenainte ca suprafa\u021ba de cernere s\u0103 fie uzat\u0103 cu adev\u0103rat.<\/p>\n\n\n\n<p>Cu toate acestea, din motive legate de costurile de produc\u021bie, aceast\u0103 preformare este utilizat\u0103 \u00een mod obi\u0219nuit pentru cele mai mici deschideri ale ochiurilor \u0219i pentru cele mai fine t\u0103ieturi, \u00een general mai mici de 10 mm.<\/p>\n\n\n\n<p>2. Preform\u0103 \"Half-notch wave\" (model : <a href=\"https:\/\/www2.203104.numlog.fr\/ro\/produits\/toiles-classiques\/\">Plangirco<\/a>)<\/p>\n\n\n\n<p>Aceast\u0103 preform\u0103 corespunde formei D, astfel cum este definit\u0103 de ISO4783\/3. Aceast\u0103 ondula\u021bie dreapt\u0103 este o evolu\u021bie a ondula\u021biei simple (forma A).<\/p>\n\n\n\n<p>C\u0103utarea unei mai bune rezisten\u021be la abraziune a dus la dezvoltarea unei tehnici de preformare caracterizat\u0103 printr-o amprent\u0103 mai pronun\u021bat\u0103 la punctele de intersec\u021bie ale fiec\u0103rui fir.<\/p>\n\n\n\n<p>\u021aesutul acestor fire (urzeal\u0103 \u0219i b\u0103t\u0103tur\u0103) are ca efect limitarea reliefului (protuberan\u021be) prin transferarea unei cantit\u0103\u021bi c\u00e2t mai mari de metal c\u0103tre suprafa\u021ba de lucru, cu o diferen\u021b\u0103 de nivel limitat\u0103 la \u00bd din diametrul firului.<\/p>\n\n\n\n<p>Prin urmare, durata de via\u021b\u0103 a \u021bes\u0103turii va fi \u00eembun\u0103t\u0103\u021bit\u0103 \u00een compara\u021bie cu o simpl\u0103 ondulare. Acest tip de preformare cu \"jum\u0103tate de crest\u0103tur\u0103\" este utilizat \u00een mod obi\u0219nuit pentru ochiuri mai mari de 10 mm.<\/p>\n\n\n\n<p>3 Preforma \"suprafa\u021b\u0103 plan\u0103 ondulat\u0103\" (model : <a href=\"https:\/\/www2.203104.numlog.fr\/ro\/produits\/toiles-classiques\/\">Plangirco suprafa\u021b\u0103 plan\u0103<\/a>)<\/p>\n\n\n\n<p>Aceast\u0103 preformare corespunde formei E definit\u0103 de standardul ISO4783\/3. Aceast\u0103 ondula\u021bie este ultima \u00eembun\u0103t\u0103\u021bire a preform\u0103rii s\u00e2rmei \u00een c\u0103utarea <strong>longevitate maxim\u0103 a sitelor de cernere<\/strong>. Nu numai c\u0103 practic nu exist\u0103 relief (denivel\u0103ri) pe suprafa\u021ba de cernere, dar cantitatea maxim\u0103 de metal disponibil este transferat\u0103 pe suprafa\u021ba de lucru.<\/p>\n\n\n\n<p>Prin combinarea \u0219tan\u021b\u0103rii \u00een unghi \u00eenchis \u0219i a decup\u0103rii firelor la fiecare punct de intersec\u021bie, aceast\u0103 preformare elimin\u0103 orice risc de deformare a suprafe\u021bei de ecranare p\u00e2n\u0103 c\u00e2nd grila este complet uzat\u0103.<\/p>\n\n\n\n<p><strong>Aceast\u0103 preformare cu \"suprafa\u021b\u0103 plan\u0103\" este \u00een mod natural eficient\u0103 \u00een domeniul s\u0103u preferat de t\u0103ieri \u0219i ochiuri de dimensiuni medii (de la 10 la 40 mm), unde precizia t\u0103ierii cerut\u0103 de standardele agregatelor \u0219i rezisten\u021ba la abraziune sunt cruciale.<\/strong><\/p>\n\n\n\n<p>Durata de via\u021b\u0103 controlat\u0103 pe numeroase instala\u021bii garanteaz\u0103 o longevitate de neegalat, cu cel pu\u021bin 30% p\u00e2n\u0103 la 50% mai mare dec\u00e2t orice alt tip de preform\u0103.<\/p>\n\n\n\n<p><strong>GIRON utilizeaz\u0103 aceast\u0103 preformare \"cu suprafa\u021b\u0103 plan\u0103\" ca standard <\/strong>de la ochiuri de 8 mm \u0219i pentru toate ochiurile care utilizeaz\u0103 s\u00e2rme cu diametre cuprinse \u00eentre 4 mm \u0219i 8 mm.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" data-block-type=\"core\">Calitatea sculelor \u0219i a procesului de fabricare a \u021bes\u0103turilor de screening<\/h3>\n\n\n\n<p>Calitatea s\u00e2rmei de o\u021bel \u0219i tipul de preformare, de\u0219i foarte importante, sunt departe de a fi suficiente pentru a ob\u021bine o plas\u0103 de cernere foarte bun\u0103. Dac\u0103 uneltele nu sunt bine concepute, dac\u0103 ma\u0219inile nu au puterea \u0219i precizia necesare, ochiurile nu vor fi regulate, iar s\u00e2rmele se vor sl\u0103bi \u00een timpul lucrului \u0219i se vor uza prematur din cauza lapajului.<\/p>\n\n\n\n<p>Compania <strong>GIRON a dezvoltat \u0219i perfec\u021bionat propriile sale ma\u0219ini, procese \u0219i tehnici unice<\/strong> pentru fabricarea de grilaje de o\u021bel de foarte \u00eenalt\u0103 calitate.<\/p>\n<\/div><\/div><\/div>\n<\/details>\n\n\n\n<details class=\"wp-block-stackable-accordion stk-block-accordion stk-inner-blocks stk-block-content stk-block stk-8b544e6 is-style-default\" data-block-id=\"8b544e6\"><style>.stk-8b544e6{border-style:solid !important;border-color:#e5e5e5 !important;border-top-width:0px !important}<\/style>\n<summary class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-5799e46 stk--container-small stk-block-accordion__heading\" data-v=\"4\" data-block-id=\"5799e46\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-5799e46-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-5799e46-inner-blocks\">\n<div class=\"wp-block-stackable-icon-label stk-block-icon-label stk-block stk-fe24274\" data-block-id=\"fe24274\"><div class=\"stk-row stk-inner-blocks stk-block-content\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-4fddbb9\" id=\"comment-choisir-la-bonne-toile-de-criblage-en-synthetiqu-e\" data-block-id=\"4fddbb9\"><h4 class=\"stk-block-heading__text\">Cum aleg materialul de ecranare potrivit?<\/h4><\/div>\n\n\n\n<div class=\"wp-block-stackable-icon stk-block-icon stk-block stk-47e709c\" data-block-id=\"47e709c\"><span class=\"stk--svg-wrapper\"><div class=\"stk--inner-svg\"><svg style=\"height:0;width:0\"><defs><lineargradient id=\"linear-gradient-47e709c\" x1=\"0\" x2=\"100%\" y1=\"0\" y2=\"0\"><stop offset=\"0%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-47-e-709-c-color-1)\"><\/stop><stop offset=\"100%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-47-e-709-c-color-2)\"><\/stop><\/lineargradient><\/defs><\/svg><svg data-prefix=\"fas\" data-icon=\"chevron-down\" class=\"svg-inline--fa fa-chevron-down fa-w-14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 448 512\" aria-hidden=\"true\" width=\"32\" height=\"32\"><path fill=\"currentColor\" d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div><\/span><\/div>\n<\/div><\/div>\n<\/div><\/div><\/summary>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-6d2960c stk-block-accordion__content\" data-v=\"4\" data-block-id=\"6d2960c\"><style>.stk-6d2960c-container{margin-top:0px !important;margin-right:0px !important;margin-bottom:0px !important;margin-left:0px !important}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-6d2960c-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-6d2960c-inner-blocks\">\n<h3 class=\"wp-block-heading\" data-block-type=\"core\"><strong>Alegerea materialului<\/strong><\/h3>\n\n\n\n<p>\u00cen prezent, nu exist\u0103 standarde specifice care s\u0103 defineasc\u0103 cerin\u021bele pentru fabricarea p\u00e2nzelor de protec\u021bie sintetice (toleran\u021be, cerin\u021be, metode de testare etc.). Dou\u0103 materiale de baz\u0103 sunt utilizate \u00een acest domeniu: cauciucul \u0219i poliuretanul.&nbsp;<\/p>\n\n\n\n<p>Dar cum se define\u0219te un material de baz\u0103 bun pentru fabricarea sitelor de cernere?<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" data-block-type=\"core\">1. Cauciuc<\/h4>\n\n\n\n<p>Cauciucul este rezultatul transform\u0103rii \u0219i amestecului omogen al mai multor ingrediente de origine \u0219i natur\u0103 diferite. Ini\u021bial, cauciucul a fost ob\u021binut din latexul natural al anumitor plante (arbori de cauciuc). Odat\u0103 cu dezvoltarea industrial\u0103 \u0219i a noilor tehnici, cauciucul poate fi fabricat \u0219i pe cale sintetic\u0103 (SBR, NBR etc.) din deriva\u021bi ai combustibililor fosili.<\/p>\n\n\n\n<p>Ast\u0103zi, procesele complexe de formulare \u0219i amestecare ne permit s\u0103 ob\u021binem cauciucuri tehnice \u0219i de \u00eenalt\u0103 performan\u021b\u0103 pentru o gam\u0103 larg\u0103 de aplica\u021bii.<\/p>\n\n\n\n<p>Principalele propriet\u0103\u021bi ale cauciucului sunt elasticitatea, impermeabilitatea \u0219i amortizarea. Ace\u0219ti trei parametri prezint\u0103 un interes deosebit \u00een domeniul cribl\u0103rii, \u00een special la prelucrarea granulometriei mari, pentru a absorbi \u0219ocurile sau a reduce zgomotul.<\/p>\n\n\n\n<p>Cu toate acestea, necesitatea de a combate uzura r\u0103m\u00e2ne primordial\u0103, iar al\u021bi parametri trebuie lua\u021bi \u00een considerare, cum ar fi rezisten\u021ba la rupere, la c\u0103ldur\u0103 \u0219i la agen\u021bii chimici, utilizarea sa \u00een timpul procesului de vulcanizare \u0219i condi\u021biile de screening.<\/p>\n\n\n\n<p>Prin urmare, cauciucul are propriet\u0103\u021bi bune de rezisten\u021b\u0103 la uzur\u0103 cauzat\u0103 de deformare \u0219i\/sau t\u0103iere. Cu toate acestea, grosimea trebuie s\u0103 fie suficient\u0103 pentru a absorbi impactul materialului pe suprafa\u021ba ecranului. \u00cen plus, unghiul de impact al materialului joac\u0103, de asemenea, un rol esen\u021bial \u00een nivelul de uzur\u0103, \u00een special rezisten\u021ba la rupere.<\/p>\n\n\n\n<p>De asemenea, GIRON colaboreaz\u0103 constant cu furnizorii s\u0103i pentru a defini formula optim\u0103 pentru produsele sale. <a href=\"https:\/\/www2.203104.numlog.fr\/ro\/produits\/caoutchouc\/\">cauciucuri de \u00eenalt\u0103 performan\u021b\u0103<\/a> \u00een func\u021bie de aplica\u021bie, cum ar fi filtrarea produselor fierbin\u021bi, a produselor chimice sau a produselor abrazive.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" data-block-type=\"core\">2. Poliuretan<\/h4>\n\n\n\n<p>Utiliza\u021bi pentru prima dat\u0103 \u00een Germania \u00een anii 1930, poliuretanii (o familie de polimeri) au devenit larg utiliza\u021bi dup\u0103 cel de-al doilea r\u0103zboi mondial, \u00eenlocuind nailonul \u0219i cauciucul.<\/p>\n\n\n\n<p>Poliuretanul (func\u021bia uretanic\u0103) este rezultatul reac\u021biei chimice a unui izocianat \u0219i a unui poliol.<br>Exist\u0103 trei familii tehnice principale: spume flexibile, spume rigide \u0219i non-spume.<br>Spumele reprezint\u0103 2\/3 din pia\u021b\u0103.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"526\" height=\"265\" src=\"https:\/\/www2.203104.numlog.fr\/wp-content\/uploads\/2024\/04\/image007-1.png\" alt=\"\" class=\"wp-image-190\" style=\"width:450px;height:auto\" srcset=\"https:\/\/www2.203104.numlog.fr\/wp-content\/uploads\/2024\/04\/image007-1.png 526w, https:\/\/www2.203104.numlog.fr\/wp-content\/uploads\/2024\/04\/image007-1-300x151.png 300w\" sizes=\"(max-width: 526px) 100vw, 526px\" \/><\/figure>\n\n\n\n<p>La sf\u00e2r\u0219itul anilor 1970, poliuretanul (o familie de substan\u021be care nu sunt spum\u0103, inclusiv elastomeri, adezivi \u0219i acoperiri) \u0219i-a f\u0103cut apari\u021bia \u00een screeningul materialelor \u0219i \u00een tehnologia de prelucrare.<\/p>\n\n\n\n<p>Ca \u0219i cauciucul, poliuretanul este rezultatul unor amestecuri \u0219i formule chimice complexe, \u00een care alegerea ingredientelor permite atingerea unor niveluri diferite de performan\u021b\u0103 \u00een func\u021bie de aplica\u021bie. Totul este o chestiune de compromis.<\/p>\n\n\n\n<p>Prin urmare, \u00een func\u021bie de condi\u021biile de screening \u0219i de tipul de material, putem \u00eembun\u0103t\u0103\u021bi propriet\u0103\u021bile <a href=\"\/ro\/solutions\/technologie-synthetique\/\">grile din poliuretan<\/a>.<\/p>\n\n\n\n<p>\u00cen teorie, pierderea prin abraziune \u00een conformitate cu DIN 53516 poate fi utilizat\u0103 pentru a compara performan\u021ba diferitelor tipuri de poliuretan. Cu toate acestea, condi\u021biile reale de cernere pe suprafe\u021bele de cernere sunt departe de acest test standardizat, iar alegerea celei mai bune calit\u0103\u021bi se bazeaz\u0103 de obicei pe experien\u021ba produc\u0103torului sau pe dezvoltarea intern\u0103 a unor proceduri de testare c\u00e2t mai apropiate de realitate.<\/p>\n\n\n\n<p>Independent de alegerea gradului, alegerea durit\u0103\u021bii (exprimat\u0103 \u00een shores) este foarte important\u0103 pentru rezisten\u021ba la abraziune. Acest lucru se datoreaz\u0103 faptului c\u0103 natura, forma \u0219i masa materialelor ecranate produc impacturi cu grade diferite de asprime, care, \u00een principiu, sunt mai bine suportate de durit\u0103\u021bi mai sc\u0103zute. Acesta este motivul pentru care construc\u021biile cu dou\u0103 straturi sunt frecvent utilizate.<\/p>\n\n\n\n<p>\u00cen cazul nostru, poliuretanii utiliza\u021bi sunt turnabili la cald \u0219i, av\u00e2nd \u00een vedere cerin\u021bele \u00een ceea ce prive\u0219te at\u00e2t raporturile de amestec ale diferitelor componente, c\u00e2t \u0219i temperaturile de prelucrare, utilizarea unei ma\u0219ini de turnare este aproape \u00eentotdeauna esen\u021bial\u0103.<\/p>\n\n\n\n<p>Rezisten\u021ba la abraziune a suprafe\u021bei de cernere depinde \u00een mod direct de respectarea condi\u021biilor de prelucrare recomandate de furnizorul materialului (temperaturi de turnare, temperatur\u0103 \u0219i timp de ardere, temperatur\u0103 \u0219i timp de aburire). \u0218i \u00een acest caz, experien\u021ba \u0219i grija \u00een timpul procesului vor garanta calitatea final\u0103 a produsului.<\/p>\n\n\n\n<p>Acesta este motivul pentru care GIRON face eforturi constante pentru a proiecta \u0219i fabrica echipamente care sunt din ce \u00een ce mai eficiente \u00een ceea ce prive\u0219te rezisten\u021ba la abraziune. Colabor\u0103m \u00een mod regulat cu furnizorii no\u0219tri pentru a defini formula optim\u0103 pentru produsele noastre. <strong>poliuretani de \u00eenalt\u0103 performan\u021b\u0103<\/strong> \u00een func\u021bie de aplica\u021bie, cum ar fi cernerea materialelor abrazive, cernerea sub ap\u0103 sau uscat\u0103 \u0219i multe altele.<\/p>\n<\/div><\/div><\/div>\n<\/details>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Pour bien choisir sa toile de crible, il faut comprendre comment elle s\u2019use. 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