{"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":"2026-04-16T09:53:05","modified_gmt":"2026-04-16T01:53:05","slug":"astm-d1938","status":"publish","type":"standard","link":"https:\/\/www.packqc.com\/lt\/standard\/astm-d1938\/","title":{"rendered":"ASTM D1938"},"content":{"rendered":"<h2 class=\"wp-block-heading\">ASTM D1938 kelni\u0173 ply\u0161imo bandymo principas<\/h2>\n\n\n\n<p>The <strong data-start=\"1385\" data-end=\"1401\">kelni\u0173 ply\u0161imas<\/strong> ASTM D1938 apibr\u0117\u017etu metodu matuojama j\u0117ga, kurios reikia vienam ply\u0161imui per plastikin\u0117s pl\u0117vel\u0117s bandin\u012f paskleisti. Bandinys paruo\u0161iamas su centriniu ply\u0161iu, kuris sudaro dvi \u201ckojas\u201d, primenan\u010dias kelnes. Kiekviena kojel\u0117 \u012fki\u0161ama \u012f tempimo bandymo ma\u0161in\u0105, o rankenos atsiskiria pastoviu grei\u010diu.<\/p>\n\n\n\n<p>Bandymo metu prietaisas fiksuoja j\u0117g\u0105, kurios reikia, kad pl\u0117vel\u0117 b\u016bt\u0173 toliau pl\u0117\u0161iama tam tikru atstumu. \u0160i j\u0117ga atspindi med\u017eiagos <strong data-start=\"1862\" data-end=\"1893\">atsparumas \u012ftr\u016bkim\u0173 plitimui<\/strong>, kuris skiriasi nuo atsparumo tempimui arba atsparumo prad\u016brimui. Praktikoje didelio atsparumo tempimui pl\u0117vel\u0117 vis tiek gali b\u016bti prastai \u012fvertinta atliekant plastikin\u0117s pl\u0117vel\u0117s ply\u0161imo bandym\u0105, jei prasid\u0117j\u0119s ply\u0161imas lengvai plinta.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kod\u0117l svarbus atsparumas ply\u0161imui<\/h3>\n\n\n\n<p>Naudojant plastikines pl\u0117veles atsparumas ply\u0161imui turi \u012ftakos ir eksploatacin\u0117ms savyb\u0117ms, ir saugai. Maisto, vaist\u0173 ir medicinos prietais\u0173 pakuo\u010di\u0173 pl\u0117vel\u0117s turi b\u016bti atsparios ply\u0161imui sandarinimo, tvarkymo ir platinimo metu. Pana\u0161\u016bs reikalavimai keliami ir \u017eem\u0117s \u016bkio pl\u0117vel\u0117ms, pramoniniams \u012fd\u0117klams bei apsaugin\u0117ms pl\u0117vel\u0117ms.<\/p>\n\n\n\n<p>The <strong data-start=\"2461\" data-end=\"2481\">ply\u0161imo bandymo metodas<\/strong> Gamintojams padeda ASTM D1938 apra\u0161ytas standartas:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Palyginti pana\u0161aus storio ir sud\u0117ties med\u017eiagas<\/li>\n\n\n\n<li>Optimizuoti pl\u0117vel\u0117s strukt\u016br\u0105, kad ji b\u016bt\u0173 ilgaam\u017e\u0117<\/li>\n\n\n\n<li>Suma\u017einti gamini\u0173 gedim\u0173, atsirandan\u010di\u0173 d\u0117l nekontroliuojamo ply\u0161imo, skai\u010di\u0173<\/li>\n\n\n\n<li>Pagalba renkantis med\u017eiagas kuriant gamin\u012f<\/li>\n<\/ul>\n\n\n\n<p>Kadangi taikant \u0161\u012f metod\u0105 daugiausia d\u0117mesio skiriama atsparumui ply\u0161imui, gaunami duomenys, kurie gerai koreliuoja su daugeliu reali\u0173 gedim\u0173 b\u016bd\u0173.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bandini\u0173 paruo\u0161imas ir bandymo s\u0105lygos<\/h2>\n\n\n\n<p>ASTM D1938 nustato grie\u017etus bandini\u0173 matmen\u0173, storio vienodumo ir kondicionavimo reikalavimus. Tinkamas paruo\u0161imas u\u017etikrina, kad rezultatai atspind\u0117t\u0173 med\u017eiagos elgsen\u0105, o ne bandymo kintamum\u0105. Bandiniai paprastai bandomi tiek ma\u0161inos, tiek skersine kryptimi, kad b\u016bt\u0173 atspind\u0117tos anizotropin\u0117s savyb\u0117s, b\u016bdingos ekstruzin\u0117ms pl\u0117vel\u0117ms.<\/p>\n\n\n\n<p>Kondicionavimas kontroliuojamoje temperat\u016broje ir dr\u0117gm\u0117je labai svarbus siekiant rezultat\u0173 pastovumo. Plastikin\u0117s pl\u0117vel\u0117s da\u017enai b\u016bna jautrios aplinkos s\u0105lygoms, o standartizuotas kondicionavimas pagerina rezultat\u0173 pakartojamum\u0105 \u012fvairiose laboratorijose.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Plastikin\u0117s pl\u0117vel\u0117s ply\u0161imo bandymo rezultat\u0173 interpretavimas<\/h2>\n\n\n\n<p>ASTM D1938 bandymo rezultatas paprastai i\u0161rei\u0161kiamas vidutine ply\u0161imo j\u0117ga. Ma\u017eiau i\u0161tempiam\u0173 pl\u0117veli\u0173 pl\u0117\u0161imo metu j\u0117ga i\u0161lieka palyginti stabili. Didelio tamprumo pl\u0117vel\u0117s gali pasi\u017eym\u0117ti svyruojan\u010diomis j\u0117gos vert\u0117mis, tod\u0117l reikia atid\u017eiai interpretuoti apkrovos ir tempimo kreiv\u0119.<\/p>\n\n\n\n<p>Lyginant med\u017eiagas b\u016btina atsi\u017evelgti \u012f stor\u012f, krypt\u012f ir pl\u0117vel\u0117s strukt\u016br\u0105. Pagal ASTM D1938 duomenis med\u017eiagos efektyviai klasifikuojamos pana\u0161iose grup\u0117se, nors pagal juos ne visada galima prognozuoti galutines galutinio naudojimo savybes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ASTM D1938, palyginti su kitais ply\u0161imo bandymo metodais<\/h2>\n\n\n\n<p>Egzistuoja keletas a\u0161ar\u0173 testavimo metod\u0173, \u012fskaitant Elmendorfo ir lie\u017euvio a\u0161ar\u0173 testus. ASTM D1938 skiriasi tuo, kad pabr\u0117\u017eia <strong data-start=\"4293\" data-end=\"4324\">atsparumas \u012ftr\u016bkim\u0173 plitimui<\/strong> esant kontroliuojamam su\u0117mimo atskyrimui, o ne sm\u016bgio ar did\u017eiausios j\u0117gos matavimui. Taikant \u0161\u012f metod\u0105 plastikin\u0117ms pl\u0117vel\u0117ms ir ploniems lak\u0161tams, gaunami tinkamesni duomenys, ypa\u010d kai eksploatuojant pl\u0117vel\u0117s tr\u016bkin\u0117ja l\u0117tai ir nepertraukiamai.<\/p>\n\n\n\n<p>Pasirinkus tinkam\u0105 ply\u0161imo bandymo metod\u0105, gaunami reik\u0161mingi rezultatai ir i\u0161vengiama klaiding\u0173 interpretacij\u0173 vertinant kokyb\u0119.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cell Instruments testavimo sprendimai<\/h2>\n\n\n\n<p>Norint atlikti tikslius ASTM D1938 bandymus, reikia stabilios <a href=\"https:\/\/www.packqc.com\/lt\/product\/sale-packaging-tensile-strength-tester-film\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"4777\" data-end=\"4795\">tempimo testeris<\/strong><\/a> su tiksliu grei\u010dio reguliavimu, patikimu j\u0117gos matavimu ir tinkamomis rankenomis kelni\u0173 ply\u0161imo pavyzd\u017eiams. <strong data-start=\"4899\" data-end=\"4919\">L\u0105steli\u0173 instrumentai<\/strong> si\u016blo pa\u017eangias tempimo bandym\u0173 sistemas, suprojektuotas taip, kad atitikt\u0173 ASTM D1938 reikalavimus ir b\u016bt\u0173 galima lanks\u010diai konfig\u016bruoti \u012fvairias pl\u0117vel\u0117s med\u017eiagas.<\/p>\n\n\n\n<p>Be standartini\u0173 bandym\u0173, \"Cell Instruments\" taip pat palaiko pritaikytus laikiklius, automatikos atnaujinimus ir specialiai pakuo\u010di\u0173, medicinos, farmacijos ir plastikini\u0173 pl\u0117veli\u0173 gamintojams skirtus bandym\u0173 sprendimus. \u0160ios galimyb\u0117s padeda laboratorijoms padidinti efektyvum\u0105, duomen\u0173 patikimum\u0105 ir atitikt\u012f tarptautiniams standartams.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\n\t\t\t\tSusisiekite su mumis Gaukite ASTM D1938 testavimo sprendim\u0105\t\t\t\t<\/h2>\n\n\n\n<p>ASTM D1938 teb\u0117ra pagrindinis standartas vertinant <strong data-start=\"5469\" data-end=\"5500\">atsparumas \u012ftr\u016bkim\u0173 plitimui<\/strong> plastikin\u0117se pl\u0117vel\u0117se. D\u0117mesys sutelkiamas \u012f tai, kaip a\u0161aros auga kontroliuojamomis s\u0105lygomis. <strong data-start=\"5585\" data-end=\"5605\">ply\u0161imo bandymo metodas<\/strong> teikia praktinius, palyginamus duomenis, reikalingus med\u017eiagoms parinkti ir kokybei kontroliuoti. Naudodami patikim\u0105 Cell Instruments bandym\u0173 \u012frang\u0105 ir technines \u017einias, gamintojai gali u\u017etikrintai \u012fvertinti ply\u0161imo savybes ir padidinti gamini\u0173 ilgaam\u017ei\u0161kum\u0105 \u012fvairiose srityse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DUK<\/h2>\n\n\n\n<p>1. Kas yra ASTM D1938 standartas?<br><strong data-start=\"176\" data-end=\"190\">ASTM D1938<\/strong> tai standartinis bandymo metodas, naudojamas matuojant j\u0117g\u0105, kurios reikia plastikin\u0117s pl\u0117vel\u0117s ir plonos pl\u0117vel\u0117s (storis \u2264 1 mm) \u012fpl\u0117\u0161imui, taikant vieno \u012fpl\u0117\u0161imo metod\u0105. \u0160is metodas labai svarbus vertinant plastikini\u0173 pl\u0117veli\u0173 atsparum\u0105 ply\u0161imui, o tai svarbu pakuo\u010di\u0173 ir med\u017eiag\u0173 atrankos procesuose. Pagrindinis \u0161io bandymo tikslas - i\u0161matuoti j\u0117g\u0105, kurios reikia, kad \u012fpl\u0117\u0161imas i\u0161sipl\u0117st\u0173 nuo pradinio pj\u016bvio per med\u017eiag\u0105.<\/p>\n\n\n\n<p>2. Kas yra kelni\u0173 ply\u0161imo testas?<br>The <strong data-start=\"680\" data-end=\"696\">kelni\u0173 ply\u0161imas<\/strong> Bandymas atliekamas ASTM D1938 apra\u0161ytu metodu. Taikant \u0161\u012f metod\u0105 pl\u0117vel\u0117s bandinyje i\u0161pjaunamas kelni\u0173 formos ply\u0161ys, dvi ply\u0161io \u201ckojos\u201d u\u017espaud\u017eiamos bandymo aparate ir bandinys traukiamas pastoviu grei\u010diu. Atliekant bandym\u0105 matuojama j\u0117ga, kurios reikia ply\u0161iui i\u0161sipl\u0117sti. \u0160is metodas padeda \u012fvertinti, kaip lengvai gali plisti plastiko pl\u0117vel\u0117s \u012ftr\u016bkimas, veikiamas streso.<\/p>\n\n\n\n<p>3. Kuo ASTM D1938 skiriasi nuo kit\u0173 ply\u0161imo bandymo metod\u0173?<br>ASTM D1938 standarte daugiausia d\u0117mesio skiriama atsparumui ply\u0161imui plisti matuoti, kai ply\u0161imas jau yra prasid\u0117j\u0119s, o kiti metodai, pvz. <strong data-start=\"1289\" data-end=\"1312\">Elmendorfo a\u0161ar\u0173 testas<\/strong> sutelkite d\u0117mes\u012f \u012f j\u0117g\u0105, kurios reikia ply\u0161imui inicijuoti. D\u0117l to ASTM D1938 standartas ypa\u010d naudingas plastikin\u0117ms pl\u0117vel\u0117ms, nes juo imituojamas realus ply\u0161imo procesas, kai ply\u0161imas prasideda ir pasklinda po vis\u0105 med\u017eiag\u0105, o ne tik tikrinamas med\u017eiagos atsparumas pradiniam ply\u0161imui.<\/p>\n\n\n\n<p>4. Koki\u0173 tip\u0173 pl\u0117vel\u0117ms taikomas ASTM D1938?<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> naudojamas plastikin\u0117ms pl\u0117vel\u0117ms ir ploniems iki 1 mm storio lak\u0161tams. Tai ypa\u010d svarbu pl\u0117vel\u0117ms, kuri\u0173 storis ma\u017eesnis nei 0,25 mm (0,010 col.). Bandymo metodas netinka pl\u0117vel\u0117ms, kurios bandym\u0173 metu patiria trapius pa\u017eeidimus, ir \u0161is metodas yra specialiai sukurtas med\u017eiagoms, kurios bandymo metu nesuply\u0161ta skersine kryptimi.<\/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":[611],"class_list":["post-9872","standard","type-standard","status-publish","has-post-thumbnail","hentry","standard-category-astm"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.packqc.com\/lt\/wp-json\/wp\/v2\/standard\/9872","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.packqc.com\/lt\/wp-json\/wp\/v2\/standard"}],"about":[{"href":"https:\/\/www.packqc.com\/lt\/wp-json\/wp\/v2\/types\/standard"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.packqc.com\/lt\/wp-json\/wp\/v2\/media\/8743"}],"wp:attachment":[{"href":"https:\/\/www.packqc.com\/lt\/wp-json\/wp\/v2\/media?parent=9872"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.packqc.com\/lt\/wp-json\/wp\/v2\/standard-category?post=9872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}