Mitundu ya Matumba Opaka Mkaka ndi Zofunikira Zowonetsera Mafilimu

Popeza mkaka ndi chakumwa chatsopano, zofunikira zaukhondo, mabakiteriya, kutentha, etc. ndizovuta kwambiri.Choncho, palinso zofunika zapadera kwa kusindikiza matumba ma CD, zomwe zimapangitsa kusindikiza mkaka ma CD filimu zosiyana ndi kusindikiza zina luso makhalidwe.Posankha filimu yopangira mkaka, iyenera kukwaniritsa zofunikira za kulongedza, kusindikiza, kukonza, kusungirako ndi kuyendetsa ndi ukhondo.Pakadali pano, filimu yomwe imagwiritsidwa ntchito kwambiri ndi filimu yopangidwa ndi polyethylene (PE) yomwe imasungunula utomoni wa polyethylene ndikuwumba.

Mitundu yamakanema opaka mkaka:

Malinga ndi mawonekedwe ake osanjikiza, imatha kugawidwa m'mitundu itatu.
1. Kanema wazolongedza wosavuta
Nthawi zambiri imakhala filimu yamtundu umodzi, yomwe imapangidwa powonjezera gawo lina la white masterbatch kuzinthu zosiyanasiyana za polyethylene ndikupangidwa ndi zida zamakanema zowombedwa.Kanema wolongedza uyu ali ndi mawonekedwe osatsekereza ndipo amadzazidwa ndi pasteurization (85 ° C / 30min), wokhala ndi shelufu yayifupi (pafupifupi masiku atatu).
2. Filimu yopangira ma co-extrusion yakuda ndi yoyera yokhala ndi mawonekedwe osanjikiza atatu
Ndi filimu yopangidwa bwino kwambiri yopangidwa ndi LDPE, LLDPE, EVOH, MLLDPE ndi ma resins ena, ophatikizidwa ndikuwomberedwa ndi masterbatches akuda ndi oyera.Masterbatch yakuda yowonjezeredwa muzitsulo zamkati za kutentha-zosindikizira zimagwira ntchito yoletsa kuwala.Kanema wolongedza uyu amatengera kutentha kwambiri nthawi yomweyo njira yoletsa kutsekereza ya hydrogen peroxide, ndipo moyo wa alumali kutentha ukhoza kufika masiku 30.
3. Filimu yopangira ma co-extrusion yakuda ndi yoyera yokhala ndi mawonekedwe osanjikiza asanu
Chigawo chapakati chotchinga (chopangidwa ndi ma resin apamwamba kwambiri monga EVA ndi EVAL) amawonjezeredwa pamene filimuyo ikuwombedwa.Chifukwa chake, filimu yonyamula iyi ndi filimu yotchinga kwambiri ya aseptic yokhala ndi alumali yayitali ndipo imatha kusungidwa kutentha kwa masiku pafupifupi 90.Makanema atatu osanjikiza komanso osanjikiza ambiri akuda ndi oyera omwe ali ndi zida zotsekera kutentha, kukana kuwala ndi okosijeni, ndipo ali ndi zabwino zamtengo wotsika mtengo, mayendedwe osavuta, malo ochepa osungira, komanso kuchita mwamphamvu.

Zofunikira pakuchita filimu ya polyethylene pazogulitsa zamkaka:
Pofuna kukwaniritsa zofunikira za kudzaza mkaka ndi kusindikiza, zotsatirazi ndizofunikira kwambiri pafilimu ya polyethylene.
1. Kusalala
Mawonekedwe amkati ndi akunja a filimuyo ayenera kukhala osalala bwino kuti atsimikizire kuti akhoza kudzazidwa bwino pamakina othamanga kwambiri.Choncho, mphamvu ya filimuyi imayenera kukhala yocheperapo, yomwe imafunika 0.2 mpaka 0.4 kusalala kwa filimuyo ikapangidwa, wozembera amasamuka kuchoka pafilimu kupita pamwamba ndikuunjikana kukhala wosanjikiza wopyapyala. , zomwe zingachepetse kwambiri kugundana kwa filimuyo ndikupanga filimuyo kukhala yosalala bwino.Zotsatira.
2. Mphamvu zamanjenje
Popeza filimu yapulasitiki imakhudzidwa ndi zovuta zamakina kuchokera kumakina odzaza okha panthawi yodzaza, zimafunika kuti filimuyo ikhale ndi mphamvu zokwanira kuti isachotsedwe chifukwa cha zovuta zamakina odzaza okha.Pakuwomba filimu, kugwiritsa ntchito tinthu tating'ono ta LDPE kapena HDPE tokhala ndi index yotsika yosungunuka kumapindulitsa kwambiri kupititsa patsogolo mphamvu zamakanema a polyethylene.
3. Kuthamanga kwamadzi pamadzi
Kuti inki yosindikizira ifalikire, yonyowa ndikumamatira bwino pamwamba pa filimu ya pulasitiki ya polyethylene, pamafunika kuti kusamvana kwapamwamba kwa filimuyo kufikire pamlingo wina, ndipo ndikofunikira kudalira chithandizo cha corona kuti tikwaniritse apamwamba kunyowetsa mavuto, apo ayi zidzakhudza inki pa filimuyo.Kumamatira ndi kulimba kwa pamwamba, motero kumakhudza ubwino wa nkhani yosindikizidwa.Nthawi zambiri pamafunika kuti kugwedezeka kwapamwamba kwa filimu ya polyethylene kukhale pamwamba pa 38dyne, ndipo ndikwabwino ngati ingathe kufika pamwamba pa 40dyne.Popeza polyethylene ndi zinthu zomwe sizikhala ndi polar polima, ilibe magulu a polar mu kapangidwe kake ka maselo, ndipo imakhala ndi crystallinity yayikulu, mphamvu yotsika yaulere, yopanda mphamvu, komanso kukhazikika kwamankhwala.Choncho, kuyenerera kusindikiza kwa zipangizo zafilimu ndizokwera kwambiri.Osauka, kumamatira kwa inki sikwabwino.
4. Kusindikiza kutentha
Chodetsa nkhawa kwambiri pakuyika filimu yokhayo ndi vuto la kusweka kwa thumba chifukwa cha kutayikira komanso kusindikiza zabodza.Choncho, filimuyi iyenera kukhala ndi katundu wopangira thumba lotsekera kutentha, kusindikiza bwino, komanso kusindikiza kutentha kwakukulu, kuti athe kugwiritsidwa ntchito poyikapo.Kuthamanga kukasintha, kutentha kusindikiza kutentha sikukhudzidwa kwambiri, ndipo MLDPE nthawi zambiri imagwiritsidwa ntchito ngati chosindikizira cha kutentha kuti chitsimikizidwe kuti kukhazikika kwa kutentha ndi kutentha kutsekedwa.Izi zikutanthauza kuti, ndikofunikira kuonetsetsa kuti kutentha kumatsekedwa ndikudula bwino kuti utomoni wosungunuka usamamatire ku mpeni.

Kuonjezera gawo lina la LLDPE mu kuwomba filimu kungathe kusintha kwambiri kutentha kwa kutentha kwa kusindikiza kusindikiza ntchito ndi kusindikiza kutentha kwa filimuyo, koma kuchuluka kwa LLDPE kuwonjezeredwa sikuyenera kukhala kwakukulu, apo ayi kukhuthala kwa filimu ya polyethylene kudzakhala. kwambiri, ndi kutentha kusindikiza ndondomeko Ndi sachedwa kukakamira mpeni kulephera.Kwa mapangidwe a filimuyo, filimu yonyamula katundu yofananayo ikhoza kusankhidwa molingana ndi zomwe zili mkati mwa phukusi ndi moyo wake wa alumali.