{"id":3369,"date":"2026-07-23T05:49:51","date_gmt":"2026-07-23T05:49:51","guid":{"rendered":"https:\/\/www.materialstests.com\/?post_type=application&p=3369"},"modified":"2026-07-23T05:50:13","modified_gmt":"2026-07-23T05:50:13","slug":"astm-d1894","status":"publish","type":"application","link":"https:\/\/www.materialstests.com\/sk\/application\/astm-d1894.html","title":{"rendered":"ASTM D1894"},"content":{"rendered":"

ASTM D1894<\/strong> je v\u0161eobecne uzn\u00e1van\u00e1 sk\u00fa\u0161obn\u00e1 met\u00f3da na stanovenie statick\u00e9ho a kinetick\u00e9ho koeficientu trenia (COF) plastov\u00fdch f\u00f3li\u00ed a pl\u00e1tov. Pri v\u00fdrobe obalov je pochopenie spr\u00e1vania sa trenia k\u013e\u00fa\u010dov\u00e9, preto\u017ee koeficient trenia plastovej f\u00f3lie<\/strong> priamo ovplyv\u0148uje manipul\u00e1ciu s materi\u00e1lom, pod\u00e1vanie do strojov, stabilitu stohovania a efekt\u00edvnos\u0165 baliacej linky.<\/p>\n\n\n\n

Plastov\u00e9 f\u00f3lie pou\u017e\u00edvan\u00e9 v oblasti flexibiln\u00fdch obalov sa \u010dasto pohybuj\u00fa cez valce, formovacie kr\u00fa\u017eky, zape\u010datovacie \u010de\u013euste a dopravn\u00edkov\u00e9 syst\u00e9my. Ak je povrchov\u00e9 trenie pr\u00edli\u0161 vysok\u00e9, m\u00f4\u017ee doch\u00e1dza\u0165 k odporu pri pod\u00e1van\u00ed f\u00f3li\u00ed, k tvorbe z\u00e1hybov alebo k preru\u0161eniam spracovania. Ak je trenie pr\u00edli\u0161 n\u00edzke, obaly sa m\u00f4\u017eu po\u010das prepravy nadmerne \u0161m\u00fdka\u0165 alebo sa nedok\u00e1\u017eu stabilne stohova\u0165.<\/p>\n\n\n\n

Spo\u013eahliv\u00fd sk\u00fa\u0161ka statick\u00e9ho trenia<\/strong> a sk\u00fa\u0161ka kinetick\u00e9ho trenia<\/strong> poskytuj\u00fa kvantitat\u00edvne inform\u00e1cie o vlastnostiach interakcie s povrchom, \u010do umo\u017e\u0148uje v\u00fdrobcom optimalizova\u0165 zlo\u017eenie materi\u00e1lov, povrchov\u00e9 \u00fapravy a v\u00fdrobn\u00e9 procesy.<\/p>\n\n\n\n

Norma ASTM D1894 definuje kontrolovan\u00fa laborat\u00f3rnu met\u00f3du na meranie sily potrebnej na to, aby sa jeden povrch materi\u00e1lu za\u010dal k\u013aza\u0165 a pokra\u010doval v k\u013azan\u00ed po inom povrchu. Tieto merania pom\u00e1haj\u00fa t\u00edmom kontroly kvality overova\u0165 konzistentnos\u0165 medzi v\u00fdrobn\u00fdmi \u0161ar\u017eami a zabezpe\u010di\u0165, aby obalov\u00e9 materi\u00e1ly spo\u013eahlivo fungovali v re\u00e1lnych podmienkach.<\/p>\n\n\n\n

Ak\u00fd je koeficient trenia plastovej f\u00f3lie?<\/h2>\n\n\n\n

Koeficient trenia (COF) vyjadruje odpor medzi dvoma stykaj\u00facimi sa povrchmi, ke\u010f sa jeden povrch pohybuje vo\u010di druh\u00e9mu. Ide o bezrozmern\u00fa hodnotu, ktor\u00e1 sa vypo\u010d\u00edta takto:<\/p>\n\n\n\n

\u03bc = f \/ N<\/strong><\/p>\n\n\n\n

Kde:<\/p>\n\n\n\n

    \n
  • \u03bc<\/strong> = koeficient trenia<\/li>\n\n\n\n
  • f<\/strong> = trecia sila potrebn\u00e1 na pohyb<\/li>\n\n\n\n
  • N<\/strong> = norm\u00e1lna sila p\u00f4sobiaca medzi povrchmi<\/li>\n<\/ul>\n\n\n\n

    Ni\u017e\u0161ia hodnota COF znamen\u00e1 plynulej\u0161ie k\u013azanie, zatia\u013e \u010do vy\u0161\u0161ia hodnota COF znamen\u00e1 v\u00e4\u010d\u0161\u00ed odpor.<\/p>\n\n\n\n

    V pr\u00edpade plastov\u00fdch f\u00f3li\u00ed sa zvy\u010dajne posudzuj\u00fa dve hodnoty trenia:<\/p>\n\n\n\n

    Hodnota trenia<\/th>Defin\u00edcia<\/th>Typick\u00e9 pou\u017eitie<\/th><\/tr><\/thead>
    Statick\u00fd COF (\u03bcs)<\/td>Sila potrebn\u00e1 na za\u010datie pohybu<\/td>Ukladanie vriec, manipul\u00e1cia s kart\u00f3nmi, stabilita balen\u00ed<\/td><\/tr>
    Kinetick\u00fd koeficient trenia (COF) (\u03bck)<\/td>Sila potrebn\u00e1 na udr\u017eanie pohybu<\/td>Odv\u00edjacie zariadenia na f\u00f3lie, vysokor\u00fdchlostn\u00e9 baliace zariadenia<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Vz\u0165ah medzi statick\u00fdm a kinetick\u00fdm tren\u00edm poskytuje cenn\u00e9 inform\u00e1cie o tom, ako sa obalov\u00e9 materi\u00e1ly spr\u00e1vaj\u00fa po\u010das prev\u00e1dzky stroja.<\/p>\n\n\n\n

    Napr\u00edklad:<\/p>\n\n\n\n

      \n
    • Polyetyl\u00e9nov\u00e1 f\u00f3lia s nadmern\u00fdm tren\u00edm m\u00f4\u017ee sp\u00f4sobi\u0165 probl\u00e9my s pod\u00e1van\u00edm na automatick\u00fdch baliacich strojoch.<\/li>\n\n\n\n
    • F\u00f3lia BOPP s n\u00edzkym tren\u00edm m\u00f4\u017ee zlep\u0161i\u0165 v\u00fdkonnos\u0165 vysokor\u00fdchlostn\u00e9ho balenia.<\/li>\n\n\n\n
    • Papierov\u00fd obal s optimalizovan\u00fdm tren\u00edm m\u00f4\u017ee zv\u00fd\u0161i\u0165 stabilitu stohovania po\u010das logistiky.<\/li>\n<\/ul>\n\n\n\n

      Pre\u010do je testovanie pod\u013ea normy ASTM D1894 d\u00f4le\u017eit\u00e9 pre kontrolu kvality obalov<\/h2>\n\n\n\n

      Predch\u00e1dzanie probl\u00e9mom na baliacej linke<\/h3>\n\n\n\n

      Modern\u00e9 baliace linky pracuj\u00fa pri vysok\u00fdch r\u00fdchlostiach, \u010do si vy\u017eaduje predv\u00eddate\u013en\u00fd pohyb materi\u00e1lu. Kol\u00edsania povrchov\u00e9ho trenia m\u00f4\u017eu sp\u00f4sobi\u0165:<\/p>\n\n\n\n

        \n
      • Pos\u00favanie alebo nespr\u00e1vne zarovnanie f\u00f3lie<\/li>\n\n\n\n
      • Chyby pri pod\u00e1van\u00ed v\u00fdrobkov<\/li>\n\n\n\n
      • Zastavenia strojov<\/li>\n\n\n\n
      • Vari\u00e1cie polohy tesnenia<\/li>\n\n\n\n
      • Zv\u00fd\u0161en\u00e9 mno\u017estvo odpadu z materi\u00e1lov<\/li>\n<\/ul>\n\n\n\n

        Pou\u017eit\u00edm ASTM D1894<\/strong> V\u010faka testovaniu po\u010das v\u00fdvoja materi\u00e1lu a vstupnej kontrole m\u00f4\u017eu v\u00fdrobcovia identifikova\u0165 rizik\u00e1 s\u00favisiace s tren\u00edm e\u0161te pred spusten\u00edm s\u00e9riovej v\u00fdroby.<\/p>\n\n\n\n

        \"Stroj<\/figure>\n\n\n\n

        Zlep\u0161ovanie v\u00fdberu materi\u00e1lov a optimaliz\u00e1cia procesov<\/h3>\n\n\n\n

        R\u00f4zne \u0161trukt\u00fary obalov klad\u00fa odli\u0161n\u00e9 po\u017eiadavky na trenie. Viacvrstvov\u00e9 f\u00f3lie, potiahnut\u00e9 papiere a laminovan\u00e9 materi\u00e1ly m\u00f4\u017eu vykazova\u0165 v\u00fdrazne odli\u0161n\u00e9 povrchov\u00e9 vlastnosti.<\/p>\n\n\n\n

        Testovanie COF pom\u00e1ha in\u017einierom pos\u00fadi\u0165:<\/p>\n\n\n\n

          \n
        • Zmeny v zlo\u017een\u00ed polym\u00e9ru<\/li>\n\n\n\n
        • Vplyvy koncentr\u00e1cie pr\u00edsad<\/li>\n\n\n\n
        • Vplyv lie\u010dby koronav\u00edrusu<\/li>\n\n\n\n
        • Vlastnosti povlaku<\/li>\n\n\n\n
        • Tla\u010dov\u00e9 a laminovacie efekty<\/li>\n\n\n\n
        • Starnutie a vplyvy \u017eivotn\u00e9ho prostredia<\/li>\n<\/ul>\n\n\n\n

          Tieto \u00fadaje podporuj\u00fa v\u00fdber materi\u00e1lov na z\u00e1klade d\u00f4kazov namiesto toho, aby sa spoliehali iba na v\u00fdrobn\u00e9 sk\u00fa\u0161ky.<\/p>\n\n\n\n

          ASTM D1894 \u2013 Princ\u00edpy sk\u00fa\u0161ky statick\u00e9ho trenia a sk\u00fa\u0161ky kinetick\u00e9ho trenia<\/h2>\n\n\n\n

          Met\u00f3da sk\u00fa\u0161ky statick\u00e9ho trenia<\/h3>\n\n\n\n

          Str\u00e1nka sk\u00fa\u0161ka statick\u00e9ho trenia<\/strong> meria po\u010diato\u010dn\u00fa silu potrebn\u00fa na spustenie pohybu medzi dvoma povrchmi.<\/p>\n\n\n\n

          Po\u010das testovania:<\/p>\n\n\n\n

            \n
          1. Sk\u00fa\u0161obn\u00fd vzorka sa upevn\u00ed na vodorovn\u00fa sk\u00fa\u0161obn\u00fa plo\u0161inu.<\/li>\n\n\n\n
          2. Na povrch vzorky sa umiestni za\u0165a\u017een\u00e9 sanice.<\/li>\n\n\n\n
          3. Sane sa \u0165ahaj\u00fa kontrolovanou r\u00fdchlos\u0165ou.<\/li>\n\n\n\n
          4. Zaznamen\u00e1va sa maxim\u00e1lna sila potrebn\u00e1 na spustenie k\u013azania.<\/li>\n\n\n\n
          5. Statick\u00fd koeficient trenia (COF) sa vypo\u010d\u00edta na z\u00e1klade nameranej sily.<\/li>\n<\/ol>\n\n\n\n

            Statick\u00fd koeficient trenia (COF) je obzvl\u00e1\u0161\u0165 d\u00f4le\u017eit\u00fd pri aplik\u00e1ci\u00e1ch, kde musia materi\u00e1ly zosta\u0165 stabiln\u00e9 pred za\u010diatkom pohybu.<\/p>\n\n\n\n

            Medzi pr\u00edklady patria:<\/p>\n\n\n\n

              \n
            • Plastov\u00e9 vreck\u00e1 naskladan\u00e9 na sebe<\/li>\n\n\n\n
            • S\u00fabory farmaceutick\u00fdch obalov<\/li>\n\n\n\n
            • Manipul\u00e1cia s vlnitou lepenkou<\/li>\n\n\n\n
            • Produkty na palet\u00e1ch<\/li>\n<\/ul>\n\n\n\n

              Met\u00f3da sk\u00fa\u0161ky kinetick\u00e9ho trenia<\/h3>\n\n\n\n

              Str\u00e1nka sk\u00fa\u0161ka kinetick\u00e9ho trenia<\/strong> vypo\u010d\u00edta silu potrebn\u00fa na udr\u017eanie plynul\u00e9ho k\u013azania po za\u010dat\u00ed pohybu.<\/p>\n\n\n\n

              Proces testovania zah\u0155\u0148a:<\/p>\n\n\n\n

                \n
              1. Neust\u00e1ly pohyb san\u00ed po povrchu vzorky.<\/li>\n\n\n\n
              2. Meranie priemernej trecej sily po\u010das k\u013azania.<\/li>\n\n\n\n
              3. V\u00fdpo\u010det hodn\u00f4t kinetick\u00e9ho koeficientu trenia (COF).<\/li>\n<\/ol>\n\n\n\n

                \u00dadaje o kinetickom tren\u00ed s\u00fa k\u013e\u00fa\u010dov\u00e9 pre:<\/p>\n\n\n\n

                  \n
                • Automatick\u00e9 plniace stroje<\/li>\n\n\n\n
                • Baliace syst\u00e9my typu \u201eform-fill-seal\u201c<\/li>\n\n\n\n
                • Procesy odv\u00edjania f\u00f3lie<\/li>\n\n\n\n
                • Vysokor\u00fdchlostn\u00e9 baliace zariadenia<\/li>\n<\/ul>\n\n\n\n

                  Preh\u013ead postupu sk\u00fa\u0161ky pod\u013ea normy ASTM D1894<\/h2>\n\n\n\n

                  Typick\u00e1 sk\u00fa\u0161ka pod\u013ea normy ASTM D1894 zah\u0155\u0148a nieko\u013eko kontrolovan\u00fdch podmienok:<\/p>\n\n\n\n

                  Parameter<\/th>Typick\u00e1 po\u017eiadavka<\/th><\/tr><\/thead>
                  Sk\u00fa\u0161obn\u00fd vzorka<\/td>Plastov\u00e1 f\u00f3lia alebo plachta<\/td><\/tr>
                  Kontaktn\u00e1 plocha<\/td>Povrch typu \u201efilm na film\u201c alebo \u201efilm na \u0161tandardn\u00fd povrch\u201c<\/td><\/tr>
                  Hmotnos\u0165 san\u00ed<\/td>200 \u00b1 1 g (be\u017ene pou\u017e\u00edvan\u00e9)<\/td><\/tr>
                  Testovacia r\u00fdchlos\u0165<\/td>150 mm\/min pod\u013ea normy ASTM D1894<\/td><\/tr>
                  Meranie<\/td>Sila statick\u00e9ho a kinetick\u00e9ho trenia<\/td><\/tr>
                  V\u00fdsledok<\/td>Hodnota COF bez jednotiek<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                  Pred vykonan\u00edm testov by laborat\u00f3ri\u00e1 mali skontrolova\u0165:<\/p>\n\n\n\n

                    \n
                  • Teplotn\u00e9 a vlhkostn\u00e9 podmienky<\/li>\n\n\n\n
                  • Doba \u00fapravy vzorky<\/li>\n\n\n\n
                  • \u010cistota povrchu<\/li>\n\n\n\n
                  • Pr\u00edprava vzoriek<\/li>\n<\/ul>\n\n\n\n

                    Spr\u00e1vna pr\u00edprava vzorky je nevyhnutn\u00e1, preto\u017ee kontamin\u00e1cia, prach, vlhkos\u0165 a po\u0161kodenie povrchu m\u00f4\u017eu v\u00fdrazne ovplyvni\u0165 v\u00fdsledky merania trenia.<\/p>\n\n\n\n

                    Materi\u00e1ly vhodn\u00e9 na sk\u00fa\u0161anie koeficientu trenia (COF) pod\u013ea normy ASTM D1894<\/h2>\n\n\n\n

                    Norma ASTM D1894 sa uplat\u0148uje hlavne na plastov\u00e9 f\u00f3lie a dosky, av\u0161ak technol\u00f3gia merania trenia sa \u0161iroko vyu\u017e\u00edva aj pri mnoh\u00fdch in\u00fdch materi\u00e1loch.<\/p>\n\n\n\n

                    Medzi be\u017ene testovan\u00e9 materi\u00e1ly patria:<\/p>\n\n\n\n

                    F\u00f3lie na flexibiln\u00e9 balenie<\/h3>\n\n\n\n
                      \n
                    • PE polyetyl\u00e9nov\u00e1 f\u00f3lia<\/li>\n\n\n\n
                    • PP polypropyl\u00e9nov\u00e1 f\u00f3lia<\/li>\n\n\n\n
                    • BOPP \u2013 biaxi\u00e1lne orientovan\u00e1 polypropyl\u00e9nov\u00e1 f\u00f3lia<\/li>\n\n\n\n
                    • PET polyesterov\u00e1 f\u00f3lia<\/li>\n\n\n\n
                    • CPP \u2013 liata polypropyl\u00e9nov\u00e1 f\u00f3lia<\/li>\n\n\n\n
                    • PVC f\u00f3lia<\/li>\n<\/ul>\n\n\n\n

                      Papier a materi\u00e1ly na b\u00e1ze vl\u00e1kien<\/h3>\n\n\n\n
                        \n
                      • Kart\u00f3n<\/li>\n\n\n\n
                      • Vlnit\u00e1 lepenka<\/li>\n\n\n\n
                      • Povlakovan\u00fd papier<\/li>\n\n\n\n
                      • Obalov\u00e9 kart\u00f3ny<\/li>\n<\/ul>\n\n\n\n

                        Ostatn\u00e9 priemyseln\u00e9 materi\u00e1ly<\/h3>\n\n\n\n
                          \n
                        • Textiln\u00e9 tkaniny<\/li>\n\n\n\n
                        • Netkan\u00e9 materi\u00e1ly<\/li>\n\n\n\n
                        • Kompozitn\u00e9 f\u00f3lie<\/li>\n\n\n\n
                        • Plastov\u00e9 dosky<\/li>\n\n\n\n
                        • Povrchy s povrchovou \u00fapravou<\/li>\n<\/ul>\n\n\n\n

                          Porovnanie normy ASTM D1894 s in\u00fdmi normami t\u00fdkaj\u00facimi sa koeficientu trenia (COF)<\/h2>\n\n\n\n

                          V r\u00f4znych odvetviach sa pou\u017e\u00edvaj\u00fa r\u00f4zne normy na sk\u00fa\u0161anie trenia v z\u00e1vislosti od typu materi\u00e1lu a \u00fa\u010delu pou\u017eitia.<\/p>\n\n\n\n

                          \u0160tandard<\/th>Aplik\u00e1cia<\/th><\/tr><\/thead>
                          ASTM D1894<\/td>Statick\u00fd a kinetick\u00fd koeficient trenia (COF) plastov\u00fdch f\u00f3li\u00ed a pl\u00e1tov<\/td><\/tr>
                          ISO 8295<\/td>Testovanie COF u plastov\u00fdch f\u00f3li\u00ed a dosiek<\/td><\/tr>
                          TAPPI T816<\/td>Sk\u00fa\u0161anie statick\u00e9ho trenia materi\u00e1lov z drevovl\u00e1knit\u00fdch dosiek<\/td><\/tr>
                          GB 10006<\/td>Po\u017eiadavky na sk\u00fa\u0161anie COF u plastov\u00fdch obalov\u00fdch materi\u00e1lov<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                          Hoci sa tieto normy zakladaj\u00fa na podobn\u00fdch princ\u00edpoch, m\u00f4\u017eu sa l\u00ed\u0161i\u0165 v nasleduj\u00facich oblastiach:<\/p>\n\n\n\n