{"id":10305,"date":"2026-04-22T16:23:36","date_gmt":"2026-04-22T08:23:36","guid":{"rendered":"https:\/\/www.packqc.com\/?post_type=standard&#038;p=10305"},"modified":"2026-04-22T16:23:37","modified_gmt":"2026-04-22T08:23:37","slug":"astm-d2732","status":"publish","type":"standard","link":"https:\/\/www.packqc.com\/uz\/standard\/astm-d2732\/","title":{"rendered":"ASTM D2732"},"content":{"rendered":"<h2 class=\"wp-block-heading\">ASTM D2732 nima va nega u muhim?<\/h2>\n\n\n\n<p><strong>ASTM D2732<\/strong> baholash uchun standartlashtirilgan yondashuvni belgilaydi <strong>Cheklanmagan chiziqli issiqlik qisqarishi<\/strong> plastik plyonka va listlar (qalinligi \u22640,76 mm). Amaliy jihatdan, bu usul yuqori haroratga duchor bo'lganda plyonkaning qanchalik qisqarishini miqdoriy baholaydi. <strong>Tashqi cheklovlarsiz<\/strong>.<\/p>\n\n\n\n<p>Film ishlab chiqarish jarayonida \u2014 masalan ekstrudatsiya yoki orientatsiya \u2014<strong>Ichki kuchlanishlar material tuzilmasiga kiritiladi.<\/strong>. Issiqlik qo'llanilganda, bu kuchlanishlar bo'shab, o'lchamlarning qisqarishiga olib keladi. Ushbu xulq-atvorni tushunish quyidagilar uchun juda muhimdir:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Qadoqlash yaxlitligi<\/strong> (masalan, qisqartiriladigan plyonka, yorliqlar)<\/li>\n\n\n\n<li><strong>Tibbiy qadoqlashda muhrning ishlashini ta'minlash<\/strong><\/li>\n\n\n\n<li><strong>Sanoat filmlarida o'lchamli barqarorlik<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>ASTM D2732 takrorlanadigan ramkani taqdim etadi.<\/strong> Turli haroratlarda qisqarishni o'lchash, muhandislar va QC jamoalariga ishlash samaradorligini qayta ishlash sharoitlari bilan bog'lash imkonini beradi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Issiqlikda qisqarish sinov usuli<\/h2>\n\n\n\n<p>The <strong>Issiqlikda qisqarish sinov usuli<\/strong> ASTM D2732 da tasvirlangan usul suyuqlik vannasi muhitida nazorat ostidagi issiqlik ta'siriga qaratilgan.<\/p>\n\n\n\n<p>Asosiy texnik printsiplar quyidagilarni o'z ichiga oladi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cheklanmagan holat:<\/strong> Namuna mexanik aralashuvsiz erkin qisqarishi kerak.<\/li>\n\n\n\n<li><strong>Issiqlik muvozanati:<\/strong> Namuna maksimal qisqarishga erishish uchun barqaror haroratga yetishi kerak.<\/li>\n\n\n\n<li><strong>Ikki yo'nalishli o'lchov:<\/strong> Qisqarish ikkala holatda ham baholanadi. <strong>mashina yo'nalishi (MD)<\/strong> va <strong>transvers yo'nalish (TD)<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p><strong>Tanqidiy tushuncha:<\/strong> Qisqarish doimiy emas \u2014 u haroratga qarab sezilarli darajada o'zgaradi. Shuning uchun bir nechta harorat nuqtalarida sinov o'tkazish taqdim etadi <strong>qisqarish profili<\/strong>, faqat bitta qiymat emas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qisqarish sinovi bo'yicha protsedura<\/h2>\n\n\n\n<p>Standartlashtirilgan <strong>qisqarish sinovi tartibi<\/strong> aniqlik va qayta ishlanishni ta'minlaydi:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Namuna tayyorlash<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kes <strong>100 mm \u00d7 100 mm namuna<\/strong><\/li>\n\n\n\n<li>Kamida ishlating <strong>Har bir sinov harorati uchun ikki namuna<\/strong><\/li>\n\n\n\n<li>Zarur bo'lsa, mashina yo'nalishini belgilang.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Testning bajarilishi<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Namunni ichiga joylashtiring <strong>bepul shrink ushlagichi<\/strong> cheklovdan qochish uchun<\/li>\n\n\n\n<li>Cho'milishdan oldin vannaning haroratini qayd eting<\/li>\n\n\n\n<li>Namunani uchun botiring <strong>taxminan 10 soniya<\/strong> (yoki muvozanatga yetguncha)<\/li>\n\n\n\n<li>Darhol sovutish muhitiga o'tkazing<\/li>\n\n\n\n<li>Barqarorlashgandan so'ng yakuniy o'lchamlarni o'lchang<\/li>\n<\/ol>\n\n\n\n<p><strong>Muhim ehtiyot choralar:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Namunni botirishdan oldin oldindan qizdirishdan saqlaning.<\/li>\n\n\n\n<li>Namuna bilan ishlash paytida uning cho'zilishining oldini oling<\/li>\n\n\n\n<li>Vanna harorati bo'ylab bir xil taqsimlanishini ta'minlang<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Qisqarish hisobi<\/h3>\n\n\n\n<p><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><mi>S<\/mi><mi>h<\/mi><mi>r<\/mi><mi>i<\/mi><mi>n<\/mi><mi>k<\/mi><mi>a<\/mi><mi>g<\/mi><mi>e<\/mi><mo stretchy=\"false\">(<\/mo><mi mathvariant=\"normal\">%<\/mi><mo stretchy=\"false\">)<\/mo><mo>=<\/mo><mfrac><mrow><msub><mi>L<\/mi><mn>0<\/mn><\/msub><mo>\u2212<\/mo><msub><mi>L<\/mi><mi>f<\/mi><\/msub><\/mrow><msub><mi>L<\/mi><mn>0<\/mn><\/msub><\/mfrac><mo>\u00d7<\/mo><mn>100<\/mn><\/mrow><annotation encoding=\"application\/x-tex\">Qisqarish(\\%) = \\frac{L_0 \u2013 L_f}{L_0} \\times 100<\/annotation><\/semantics><\/math>Qisqarish(%)=L0\u200bL0\u200b\u2212Lf\u200b\u200b\u00d7100<\/p>\n\n\n\n<p>Qayerda:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><msub><mi>L<\/mi><mn>0<\/mn><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">L_0<\/annotation><\/semantics><\/math>L0: Dastlabki uzunlik (odatda 100 mm)<\/li>\n\n\n\n<li><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><msub><mi>L<\/mi><mi>f<\/mi><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">L_f<\/annotation><\/semantics><\/math>Lf: qisqarishdan keyingi oxirgi uzunlik<\/li>\n<\/ul>\n\n\n\n<p>Ushbu formula ta'minlaydi <strong>Chiziqli qisqarish foizi<\/strong>, materiallarni solishtirish va sifat nazorati uchun muhim parametr.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Film Free Shrink Tester: sinov aniqligini yaxshilash<\/h2>\n\n\n\n<p>A <strong><a href=\"https:\/\/www.packqc.com\/uz\/products\/fst-01-film-shrinkage-tester\/\" target=\"_blank\" data-type=\"products\" data-id=\"9536\" rel=\"noreferrer noopener\">Film bo'lmagan siqish testori<\/a><\/strong> ASTM D2732ni yuqori aniqlik bilan bajarish uchun zarurdir. Qo'lda sozlamalar bilan solishtirganda, maxsus asboblar quyidagilarni taklif etadi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Barqaror harorat nazorati (\u00b10,3\u00b0C)<\/strong><\/li>\n\n\n\n<li><strong>Suyuq muhit orqali bir tekis isitish<\/strong><\/li>\n\n\n\n<li><strong>Boshqariladigan botirish vaqti<\/strong><\/li>\n\n\n\n<li><strong>Doimiy cheklovlarsiz sharoitlar<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Masalan, <strong>Hujayra asboblari <a href=\"https:\/\/www.packqc.com\/uz\/products\/fst-01-film-shrinkage-tester\/\" target=\"_blank\" rel=\"noreferrer noopener\">FST-01 filmisiz qisqartirish sinovchisi<\/a><\/strong> laboratoriyalarga quyidagilarni amalga oshirishga imkon beradi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Haqiqiy dunyodagi siqish sharoitlarini simulyatsiya qiling<\/li>\n\n\n\n<li>Takrorlanadigan siqilish ma'lumotlarini hosil qiling<\/li>\n\n\n\n<li>Operator tomonidan keltiriladigan o'zgaruvchanlikni kamaytiring<\/li>\n<\/ul>\n\n\n\n<p>uning <strong>PID boshqariladigan isitish tizimi va standart jihozlar<\/strong> Operatsion samaradorlikni oshirish bilan birga ASTM D2732 talablariga rioya qilinishini ta'minlash.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ASTM D2732 natijalariga ta'sir qiluvchi asosiy omillar<\/h2>\n\n\n\n<p>Natijalarni to'g'ri talqin qilish uchun quyidagi o'zgaruvchilarni hisobga oling:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Material tarkibi<\/h3>\n\n\n\n<p>Turli polimerlar (PET, PVC, PE) molekulyar yo'nalish va kristallanish darajasi tufayli turlicha qisqarish xususiyatlarini namoyish etadi.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Ishlov berish tarixi<\/h3>\n\n\n\n<p>Film cho'zish nisbatlari, sovish tezligi va annellash to'g'ridan-to'g'ri ta'sir qiladi <strong>qoldiq stress darajalari<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Harorat tanlovi<\/h3>\n\n\n\n<p>Bir nechta haroratlarda o'tkazilgan sinovlar quyidagilarni ko'rsatadi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Qisqarish boshlanishi<\/li>\n\n\n\n<li>Eng katta qisqarish nuqtasi<\/li>\n\n\n\n<li>Termik o'tish xulq-atvori<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Qalinlik va tuzilishi<\/h3>\n\n\n\n<p>Qalinroq yoki ko'p qatlamli filmlar muvozanatga erishish uchun cho'ndirish vaqtini uzaytirishni talab qilishi mumkin.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tez-tez so&#039;raladigan savollar<\/h2>\n\n\n\n<p>1. ASTM D2732 sinovi uchun qaysi materiallar mos keladi?<br>Qalinligi \u22640,76 mm bo'lgan plastik plyonka va listalar, jumladan PET, PE, PVC va ko'p qatlamli laminatlar.<\/p>\n\n\n\n<p>2. Cheklanmagan qisqarish nima uchun muhim?<br>Bu tashqi kuchlarsiz moddaning ichki xulq-atvorini aks ettiradi, taqdim etadi <strong>haqiqiy qisqarish xususiyatlari<\/strong>.<\/p>\n\n\n\n<p>3. Namunalarning qancha vaqt suvda turishi kerak?<br>Odatda 10 soniya, ammo qalinroq yoki yangi materiallar to'liq qisqarishini ta'minlash uchun tasdiqlashni talab qilishi mumkin.<\/p>\n\n\n\n<p>4. MD va TD siqilishlari o'rtasidagi farq nima?<br>MD (mashina yo'nalishi) film ishlab chiqarish yo'nalishi bilan mos keladi, TD esa unga perpendikulyar \u2014 har ikkalasi xususiyatlarga turlicha ta'sir qiladi.<\/p>\n\n\n\n<p>5. Qila oladimi <a href=\"https:\/\/store.astm.org\/d2732-14r25.html\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">ASTM D2732<\/a> Erituvchiga asoslangan qisqarish uchun ishlatiladimi?<br>Yo'q, u erituvchining yo'qolishi tufayli yuzaga keladigan qisqarishni hisobga olmaydi.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>ASTM D2732 plastik plyonkalarning nazorat ostida isitilgandan keyin o'lcham o'zgarishlarini o'lchash orqali ularning cheklanmagan chiziqli issiqlik qisqarishini baholaydi.<\/p>","protected":false},"featured_media":10306,"parent":0,"template":"","meta":{"_acf_changed":true,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}}},"standard-category":[],"class_list":["post-10305","standard","type-standard","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/standard\/10305","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/standard"}],"about":[{"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/types\/standard"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/media\/10306"}],"wp:attachment":[{"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/media?parent=10305"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/standard-category?post=10305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}