T\u00eb Shk\u00ebputje n\u00eb pantallona<\/strong> Metoda e p\u00ebrcaktuar n\u00eb ASTM D1938 mat forc\u00ebn e nevojshme p\u00ebr t\u00eb p\u00ebrhapur nj\u00eb \u00e7arje t\u00eb vetme n\u00ebp\u00ebr nj\u00eb most\u00ebr filmi plastik. Mostra p\u00ebrgatitet me nj\u00eb \u00e7arje qendrore q\u00eb formon dy \u201ck\u00ebmb\u00eb\u201d, t\u00eb ngjashme me nj\u00eb pal\u00eb pantallona. \u00c7do k\u00ebmb\u00eb ngjitet n\u00eb nj\u00eb makin\u00eb prove t\u00eb t\u00ebrheqjes, dhe kap\u00ebset ndahen me nj\u00eb shpejt\u00ebsi konstante.<\/p>\n\n\n\n Gjat\u00eb testit, instrumenti regjistron forc\u00ebn e nevojshme p\u00ebr t\u00eb vazhduar k\u00ebputjen e filmit n\u00eb nj\u00eb distanc\u00eb t\u00eb p\u00ebrcaktuar. Kjo forc\u00eb pasqyron materialin rezistenca ndaj p\u00ebrhapjes s\u00eb \u00e7arjes<\/strong>, q\u00eb ndryshon nga forca t\u00ebrheq\u00ebse ose rezistenca ndaj shpimit. N\u00eb praktik\u00eb, nj\u00eb film me forc\u00eb t\u00eb lart\u00eb t\u00ebrheq\u00ebse mund t\u00eb performoj\u00eb dob\u00ebt n\u00eb nj\u00eb test grisjeje t\u00eb filmit plastik n\u00ebse grisja p\u00ebrhapet leht\u00eb sapo t\u00eb nis\u00eb.<\/p>\n\n\n\n N\u00eb aplikimet e filmave plastik\u00eb, rezistenca ndaj grisjes ndikon si n\u00eb performanc\u00eb ashtu edhe n\u00eb siguri. Film\u00ebt e paketimit p\u00ebr ushqime, produkte farmaceutike dhe pajisje mjek\u00ebsore duhet t\u00eb rezistojn\u00eb ndaj grisjes gjat\u00eb vulosjes, trajtimit dhe shp\u00ebrndarjes. Film\u00ebt bujq\u00ebsor\u00eb, mbulesat industriale dhe film\u00ebt mbrojt\u00ebs p\u00ebrballen me k\u00ebrkesa t\u00eb ngjashme.<\/p>\n\n\n\n T\u00eb Metoda e testimit me lot<\/strong> p\u00ebrshkruar n\u00eb ASTM D1938 ndihmon prodhuesit:<\/p>\n\n\n\n Sepse metoda p\u00ebrqendrohet n\u00eb rezistenc\u00ebn ndaj p\u00ebrhapjes s\u00eb \u00e7arjes, ajo ofron t\u00eb dh\u00ebna q\u00eb korrelojn\u00eb mir\u00eb me shum\u00eb m\u00ebnyra d\u00ebshtimi n\u00eb bot\u00ebn reale.<\/p>\n\n\n\n ASTM D1938 p\u00ebrcakton k\u00ebrkesa t\u00eb rrepta p\u00ebr dimensionet e mostrave, uniformitetin e trash\u00ebsis\u00eb dhe kondicionimin. P\u00ebrgatitja e duhur siguron q\u00eb rezultatet t\u00eb pasqyrojn\u00eb sjelljen e materialit dhe jo variabilitetin e testit. Mostrat zakonisht testohen si n\u00eb drejtimin e makin\u00ebs ashtu edhe n\u00eb drejtimin transversal p\u00ebr t\u00eb kapur vetit\u00eb anizotrope t\u00eb zakonshme n\u00eb filmat e ekstruduar.<\/p>\n\n\n\n Kondicionimi n\u00eb temperatur\u00eb dhe lag\u00ebshtir\u00eb t\u00eb kontrolluar luan nj\u00eb rol t\u00eb r\u00ebnd\u00ebsish\u00ebm n\u00eb q\u00ebndrueshm\u00ebrin\u00eb e rezultateve. Filmat plastik\u00eb shpesh tregojn\u00eb ndjeshm\u00ebri ndaj kushteve mjedisore, dhe kondicionimi i standardizuar p\u00ebrmir\u00ebson p\u00ebrs\u00ebritshm\u00ebrin\u00eb nd\u00ebr laborator\u00eb.<\/p>\n\n\n\n Rezultati i nj\u00eb testi ASTM D1938 zakonisht shprehet si nj\u00eb forc\u00eb mesatare e p\u00ebrhapjes s\u00eb grisjes. P\u00ebr filmat m\u00eb pak t\u00eb zgjatsh\u00ebm, forca mbetet relativisht e q\u00ebndrueshme gjat\u00eb grisjes. Film\u00ebt shum\u00eb t\u00eb zgjatsh\u00ebm mund t\u00eb shfaqin vlera forca t\u00eb luhatshme, duke k\u00ebrkuar interpretim t\u00eb kujdessh\u00ebm t\u00eb kurb\u00ebs ngarkes\u00eb\u2013zgjatje.<\/p>\n\n\n\n Kur krahasohen materialet, \u00ebsht\u00eb thelb\u00ebsore t\u00eb merren parasysh trash\u00ebsia, drejtimi dhe struktura e filmit. T\u00eb dh\u00ebnat e ASTM D1938 rendisin materialet n\u00eb m\u00ebnyr\u00eb efektive brenda grupeve t\u00eb ngjashme, megjithat\u00eb ato nuk parashikojn\u00eb gjithmon\u00eb performanc\u00ebn p\u00ebrfundimtare n\u00eb p\u00ebrdorimin e fundit.<\/p>\n\n\n\n Ekzistojn\u00eb disa metoda testimi t\u00eb grisjes, p\u00ebrfshir\u00eb testet Elmendorf dhe testet e grisjes me gjuh\u00eb. ASTM D1938 ndryshon duke theksuar rezistenca ndaj p\u00ebrhapjes s\u00eb \u00e7arjes<\/strong> n\u00ebn ndarje t\u00eb kontrolluar t\u00eb kapjes, n\u00eb vend t\u00eb matjes s\u00eb goditjes ose forc\u00ebs kulmore. P\u00ebr filmat plastik\u00eb dhe flet\u00ebt e holla, ky qasje ofron t\u00eb dh\u00ebna m\u00eb relevante, ve\u00e7an\u00ebrisht kur filmat p\u00ebrjetojn\u00eb \u00e7arje t\u00eb ngadalt\u00eb dhe t\u00eb vazhdueshme gjat\u00eb p\u00ebrdorimit.<\/p>\n\n\n\n Zgjedhja e metod\u00ebs s\u00eb duhur t\u00eb testimit t\u00eb lotimit siguron rezultate dometh\u00ebn\u00ebse dhe shmang keqinterpretimet gjat\u00eb vler\u00ebsimit t\u00eb cil\u00ebsis\u00eb.<\/p>\n\n\n\nPse rezistenca ndaj p\u00ebrhapjes s\u00eb \u00e7arjeve ka r\u00ebnd\u00ebsi<\/h3>\n\n\n\n
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P\u00ebrgatitja e mostrave dhe kushtet e testimit<\/h2>\n\n\n\n
Interpretimi i rezultateve nga testi i lotit t\u00eb filmit plastik<\/h2>\n\n\n\n
ASTM D1938 krahasuar me metodat e tjera t\u00eb testimit t\u00eb grisjes<\/h2>\n\n\n\n
Zgjidhje testimi nga Cell Instruments<\/h2>\n\n\n\n