{"id":9872,"date":"2026-02-24T15:11:46","date_gmt":"2026-02-24T07:11:46","guid":{"rendered":"https:\/\/www.packqc.com\/standard\/astm-d1938-2\/"},"modified":"2026-03-19T10:04:34","modified_gmt":"2026-03-19T02:04:34","slug":"astm-d1938","status":"publish","type":"standard","link":"https:\/\/www.packqc.com\/uz\/standard\/astm-d1938\/","title":{"rendered":"ASTM D1938"},"content":{"rendered":"<h2 class=\"wp-block-heading\">ASTM D1938 shim yirtilish sinovi printsipi<\/h2>\n\n\n\n<p>The <strong data-start=\"1385\" data-end=\"1401\">shim yirtig'i<\/strong> ASTM D1938da belgilangan usul plastik film namunasida bitta yirtishni tarqatish uchun zarur kuchni o'lchaydi. Namuna markaziy yirtma bilan tayyorlanadi, u ikki \u201coyoq\u201d hosil qilib, shimga o'xshaydi. Har bir oyoq tortish sinovi mashinasiga mahkamlanadi va tutqichlar doimiy tezlikda ajraladi.<\/p>\n\n\n\n<p>Sinov davomida asbob filmni belgilangan masofada yirtishni davom ettirish uchun zarur kuchni qayd etadi. Ushbu kuch materialning <strong data-start=\"1862\" data-end=\"1893\">Yoriq tarqalishiga qarshilik<\/strong>, Bu tortish kuchi yoki teshib o'tishga chidamlilikdan farq qiladi. Amalda, yuqori tortish kuchiga ega film bo'lsa ham, yirtish boshlandi deguncha oson tarqaladigan bo'lsa, plastik filmning yirtilish sinovida yomon natija ko'rsatishi mumkin.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Nega yirtish tarqalishiga qarshilik muhimdir<\/h3>\n\n\n\n<p>Plastik plyonka ilovalarida yirtilishga chidamlilik ishlash samaradorligi va xavfsizlikka ta'sir qiladi. Oziq-ovqat, dori-darmon va tibbiyot buyumlarini qadoqlash uchun mo'ljallangan plyonkalarning yopilish, tashish va tarqatish jarayonlarida yirtilishga chidamliligi bo'lishi kerak. Qishloq xo'jaligi plyonkalari, sanoat astarlari va himoya qoplamalari ham shunga o'xshash talablarga duch keladi.<\/p>\n\n\n\n<p>The <strong data-start=\"2461\" data-end=\"2481\">ko'z yoshi sinov usuli<\/strong> ASTM D1938 da tavsiflangan ishlab chiqaruvchilarga yordam beradi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>O'xshash qalinlik va tarkibga ega materiallarni solishtiring.<\/li>\n\n\n\n<li>Film tuzilmalarini chidamlilik uchun optimallashtiring<\/li>\n\n\n\n<li>Nazoratsiz yirtilish tufayli yuzaga keladigan mahsulot nuqsonlarini kamaytiring<\/li>\n\n\n\n<li>Mahsulotni ishlab chiqish jarayonida material tanlashni qo'llab-quvvatlash<\/li>\n<\/ul>\n\n\n\n<p>Chunki usul yirtilish tarqalishiga qarshilikka e'tibor qaratadi, u ko'plab haqiqiy dunyodagi nosozlik rejimlari bilan yaxshi mos keladigan ma'lumotlarni taqdim etadi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Namuna tayyorlash va sinov sharoitlari<\/h2>\n\n\n\n<p>ASTM D1938 namunalar o'lchamlari, qalinlik birxilligi va sharoitga keltirish bo'yicha qat'iy talablarni belgilaydi. To'g'ri tayyorlash natijalar sinov o'zgaruvchanligidan emas, balki material xatti-harakatidan dalolat berishini ta'minlaydi. Ekstrudatsiya qilingan plyonkalarda keng tarqalgan anizotrop xususiyatlarni aniqlash uchun namuna odatda ham mashina yo'nalishida, ham kesish yo'nalishida sinovdan o'tkaziladi.<\/p>\n\n\n\n<p>Boshqariladigan harorat va namlik sharoitida sharoitga keltirish natijalar izchilligini ta'minlashda muhim rol o'ynaydi. Plastmassa plyonkalari ko'pincha atrof-muhit sharoitlariga sezgir bo'lib, standartlashtirilgan sharoitga keltirish laboratoriyalar o'rtasida natijalar takrorlanuvchanligini yaxshilaydi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Plastik plyonka yosh testining natijalarini talqin qilish<\/h2>\n\n\n\n<p>ASTM D1938 sinovining natijasi odatda o'rtacha yirtilish tarqalish kuchi sifatida ifodalanadi. Kam cho'ziladigan plyonkalarda yirtilish jarayonida kuch nisbatan barqaror bo'lib qoladi. Yuqori cho'ziladigan plyonkalarda esa kuch qiymatlari o'zgaruvchan bo'lishi mumkin, bu esa yuk\u2013cho'zilish egri chizig'ini diqqat bilan talqin etishni talab qiladi.<\/p>\n\n\n\n<p>Materiallarni solishtirganda qalinlik, yo'nalish va film tuzilmasini hisobga olish muhimdir. ASTM D1938 ma'lumotlari materiallarni o'xshash guruhlar ichida samarali tartiblaydi, ammo ular o'zlari yakuniy oxirgi foydalanishdagi xususiyatlarni har doim ham oldindan ayta olmaydi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ASTM D1938 boshqa yirtish sinov usullari bilan solishtirilganda<\/h2>\n\n\n\n<p>Bir nechta yirtish sinovlari mavjud, jumladan Elmendorf va tilcha yirtish sinovlari. ASTM D1938 esa urg'u berish bilan farq qiladi <strong data-start=\"4293\" data-end=\"4324\">Yoriq tarqalishiga qarshilik<\/strong> Ta'sir yoki cho'qqi kuchni o'lchash o'rniga nazorat ostidagi tutashuv ajralishini o'lchash. Plastik plyonka va yupqa listalar uchun bu yondashuv, ayniqsa plyonkalar xizmat davomida sekin, uzluksiz yirtilishga uchraganida, ko'proq tegishli ma'lumotlarni taqdim etadi.<\/p>\n\n\n\n<p>To'g'ri yirtish sinovi usulini tanlash ma'noli natijalarni ta'minlaydi va sifat baholash jarayonida noto'g'ri talqin qilinishining oldini oladi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cell Instrumentsdan sinov yechimlari<\/h2>\n\n\n\n<p>Aniq ASTM D1938 sinovi barqarorlikni talab qiladi <a href=\"https:\/\/www.packqc.com\/uz\/product\/sale-packaging-tensile-strength-tester-film\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"4777\" data-end=\"4795\">kuchlanish sinovchisi<\/strong><\/a> aniq tezlik nazorati, ishonchli kuch o'lchovi va shim yirtilish namunalariga mos tutqichlar bilan. <strong data-start=\"4899\" data-end=\"4919\">Hujayra asboblari<\/strong> ASTM D1938 talablariga javob beradigan va turli film materiallari uchun moslashuvchan konfiguratsiyani qo'llab-quvvatlaydigan ilg'or tortish sinovlari tizimlarini taqdim etadi.<\/p>\n\n\n\n<p>Standart sinovlardan tashqari, Cell Instruments shuningdek qadoqlash, tibbiy, farmatsevtika va plastik plyonka ishlab chiqaruvchilari uchun moslashtirilgan jihozlar, avtomatlashtirishni yangilash va maxsus sinov yechimlarini qo'llab-quvvatlaydi. Bu imkoniyatlar laboratoriyalarga samaradorlikni, ma'lumotlarning ishonchliligini va xalqaro standartlarga muvofiqlikni yaxshilashga yordam beradi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\n\t\t\t\tBiz bilan bog'laning va ASTM D1938 sinov yechimini oling\t\t\t\t<\/h2>\n\n\n\n<p>ASTM D1938 baholash uchun asosiy standart bo'lib qolmoqda <strong data-start=\"5469\" data-end=\"5500\">Yoriq tarqalishiga qarshilik<\/strong> plastik plyonkalarida. Nazorat ostidagi sharoitlarda yoshning qanday o'sishiga e'tibor qaratish orqali, bu <strong data-start=\"5585\" data-end=\"5605\">ko'z yoshi sinov usuli<\/strong> Material tanlash va sifat nazorati uchun amaliy, solishtirish mumkin bo'lgan ma'lumotlarni taqdim etadi. Cell Instrumentsning ishonchli sinov uskunalari va texnik tajribasi yordamida ishlab chiqaruvchilar yirtilishga chidamlilikni ishonch bilan baholab, turli qo'llanmalarda mahsulot mustahkamligini oshirishlari mumkin.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">TSS<\/h2>\n\n\n\n<p>1. ASTM D1938 standarti nima?<br><strong data-start=\"176\" data-end=\"190\">ASTM D1938<\/strong> Bu plastik plyonka va yupqa listalarda (qalinligi \u2264 1 mm) yoriqni tarqatish uchun zarur kuchni yagona yoriq usuli yordamida o'lchashga mo'ljallangan standart sinov usulidir. Ushbu usul plastik plyonkalarning yoriq tarqalishga chidamliligini baholashda muhim bo'lib, qadoqlash va material tanlash jarayonlarida ahamiyat kasb etadi. Sinovning asosiy maqsadi material bo'ylab dastlabki kesikdan yoriqni kengaytirish uchun zarur kuchni o'lchashdan iborat.<\/p>\n\n\n\n<p>2. Shim yirtish testi nima?<br>The <strong data-start=\"680\" data-end=\"696\">shim yirtig'i<\/strong> Test ASTM D1938 da tasvirlangan usuldir. U film namunasiga \u201cshim shaklidagi\u201d yoriq kesish, yoriqning ikki \u201coyoq\u201dini sinov mashinasida qisib qo'yish va namunani doimiy tezlikda tortishni o'z ichiga oladi. Sinov davomida yoriqni kengaytirish uchun zarur kuch o'lchanadi. Ushbu usul plastik filmlarda stress ostida yoriq qanchalik oson tarqalishini baholashga yordam beradi.<\/p>\n\n\n\n<p>3. ASTM D1938 boshqa yirtish sinovi usullaridan qanday farq qiladi?<br>ASTM D1938 aniqlik bilan yirtish boshlandi dan keyin yirtish tarqalishiga qarshilikni o'lchashga qaratilgan, boshqa usullar esa, masalan <strong data-start=\"1289\" data-end=\"1312\">Elmendorf yoriq sinovi<\/strong> Yirtilishni boshlash uchun zarur kuchga e'tibor qaratadi. Bu ASTM D1938 ni plastik plyonkalar uchun ayniqsa foydali qiladi, chunki u materialning dastlabki sinishga qarshiligini sinash bilan cheklanmay, yirtilishning haqiqiy jarayonini \u2014 yirtik qanday boshlanib, material bo'ylab tarqalishini \u2014 taqlid qiladi.<\/p>\n\n\n\n<p>4. ASTM D1938 qaysi turdagi filmlarga tatbiq etiladi?<br><a href=\"https:\/\/store.astm.org\/d1938-19.html?_gl=1*17uechj*_gcl_aw*R0NMLjE3Njg3ODk3MzcuQ2owS0NRaUFwckxMQmhDTUFSSXNBRURoZFBmZnpaMHVBMGMtdjB4RWdqR0hGSWVCaVZjeTJBM3RfRHV0ajduOVh3QlJuQUVlbGdZOU00TWFBcWlSRUFMd193Y0I.*_gcl_au*MTkwOTY2MzAwNC4xNzY1Nzc5ODUz\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">ASTM D1938<\/a> U qalinligi 1 mm gacha bo'lgan plastik plyonka va yupqa listlarga tatbiq etiladi. Bu ayniqsa qalinligi 0,25 mm (0,010 dyuym) dan kam bo'lgan plyonkalarga juda muhimdir. Sinov usuli sinov paytida mo'rt sinishlar namoyon qiladigan plyonkalarga mos emas va usul sinov davomida kesish yo'nalishida yirtilmaydigan materiallar uchun maxsus ishlab chiqilgan.<\/p>","protected":false},"excerpt":{"rendered":"<p>ASTM D1938 Trouser Tear Test Principle The trouser tear method defined in ASTM D1938 measures the force required to propagate a single tear through a plastic film specimen. The specimen is prepared with a central slit that forms two \u201clegs,\u201d resembling a pair of trousers. Each leg is clamped into a tensile testing machine, and [&hellip;]<\/p>","protected":false},"featured_media":8743,"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":"","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-9872","standard","type-standard","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/standard\/9872","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\/8743"}],"wp:attachment":[{"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/media?parent=9872"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.packqc.com\/uz\/wp-json\/wp\/v2\/standard-category?post=9872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}