Mzere Wowonjezera wa PP/PE/PA/PETG/EVOH Multilayer Barrier Sheet
Chizindikiro Chachikulu Chaukadaulo
| Chitsanzo cha mzere | Chitsanzo cha Extruder | M'lifupi mwa zinthu | makulidwe azinthu | Zotulutsa za extrusion pakupanga |
| Zigawo 7 zophatikizana | 120/75/50/60/75 | 800-1200mm | 0.2-0.5mm | 500-600kg/h |
| Zigawo 9 zophatikizana | 75/100/60/65/50/75/75 | 800-1200mm | 0.05-0.5mm | 700-800kg/h |
Zindikirani: Mafotokozedwe amatha kusintha popanda kudziwitsa pasadakhale.
Mkhalidwe wa msika wa mapulogalamu opaka ma EVOH
Mu gawo la ma CD a chakudya chozizira, anthu ankagwiritsa ntchito zipangizo zachitsulo kapena galasi ngati ma CD kuti athetse bwino kulowa kwa zinthu zosiyanasiyana za mpweya mkati ndi kunja kuti atsimikizire kuti zomwe zili mkati ndi mtengo wake ndi zabwino. Chifukwa pali zinthu zitatu zazikulu zomwe zimayambitsa kuwonongeka kwa chakudya: zinthu zamoyo (machitidwe a ma enzyme a m'thupi, ndi zina zotero), zinthu za mankhwala (makamaka ma CD a zinthu za chakudya) ndi zinthu zakuthupi (hygroscopic, kuuma, ndi zina zotero). Zinthuzi zimagwira ntchito pa zinthu zachilengedwe monga mpweya, kuwala, kutentha, chinyezi, ndi zina zotero, zomwe zimayambitsa kuwonongeka kwa chakudya. Kuletsa kuwonongeka kwa chakudya makamaka ndikoletsa kuchuluka kwa tizilombo toyambitsa matenda m'chakudya, kupewa ma CD a zinthu za chakudya ndi mpweya, ndikuletsa chinyezi ndikusunga kukoma koyambirira kwa chakudya.
Ethylene-vinyl alcohol copolymer, yotchedwa EVOH, imadziwika kuti ndi ma resin atatu akuluakulu padziko lonse lapansi omwe ali ndi polyvinylidene chloride (PVDC) ndi polyamide (PA) [2]. EVOH imatha kuletsa kwambiri kulowa kwa mpweya mumlengalenga kupita ku chakudya, motero imaletsa kupanga poizoni ndi zinthu zina zovulaza chifukwa cha kuchuluka kwa tizilombo toyambitsa matenda, komanso imatha kuletsa kusintha kwa kapangidwe kake komwe kumachitika chifukwa cha okosijeni, pomwe ikusunga fungo labwino ndikuletsa kuipitsidwa kwa fungo lakunja. Kuphatikiza apo, kusowa kwa zinthu zotchingira chinyezi kumatha kulipidwa ndi zigawo zina za polyolefin. Chifukwa chake, zinthu zopakidwa za EVOH multilayer zimatha kuletsa kuwonongeka kwa chakudya ndikuwonjezera nthawi yosungira. Kuphatikiza apo, ndizosavuta kukonza ndikupanga, ndipo zimakhala ndi magwiridwe antchito abwino oteteza chilengedwe. Chifukwa cha zinthu zabwino kwambiri zotchingira mpweya, kuwonekera bwino, kusinthika komanso kukana kusungunuka kwa utomoni wa EVOH, minda yake yogwiritsidwa ntchito ikukulirakulira, ndipo kufunikira kwake kukukulirakuliranso mwachangu.
Utomoni wa EVOH wotchinga kwambiri
1. Katundu wa zinthu
Katundu wotchinga wa EVOH Katundu wotchinga wa zinthu zopangidwa ndi polima amatanthauza mphamvu yotetezera zinthu ku mpweya waung'ono wa mamolekyu, zakumwa, nthunzi ya madzi, ndi zina zotero. Mitundu ya utomoni yomwe imagwiritsidwa ntchito kwambiri masiku ano yomwe ili ndi makhalidwe abwino otchinga ndi iyi: EVOH, PVDC, PAN, PEN, PA ndi PET.
2. EVOH ikagwiritsidwa ntchito ngati chinthu chotchinga kwambiri, nthawi zambiri imagwiritsa ntchito kapangidwe ka zinthu zosakanikirana zokhala ndi zigawo zambiri. Zinthu zosakanikirana zomwe zimagwiritsidwa ntchito kwambiri ndi izi: PP, HIPS, PE, EVOH, AD, ndipo AD ndiye guluu m'kapangidwe kake. Kapangidwe ka zinthu zosakanikirana zokhala ndi zigawo zambiri kakhoza kupereka mawonekedwe athunthu a chinthu chilichonse, kupititsa patsogolo kukana kwa madzi kwa EVOH, ndikupeza chinthu chotchinga kwambiri chokhala ndi mawonekedwe abwino kwambiri. Ambiri mwa iwo ankagwiritsidwa ntchito popaka zinthu zosinthasintha kale, koma ma resin ophatikizana monga PP, PE, ndi PA ndi ovuta kuwapaka chifukwa cha kulimba kwawo komanso kusalimba kwawo, zomwe zimalepheretsa kugwiritsidwa ntchito kwawo m'mapaki okhazikika, makamaka pazinthu zodzaza pa intaneti. Ma HIPS a polystyrene osagwira ntchito ali ndi kulimba bwino komanso mawonekedwe abwino kwambiri, oyenera kubowola komanso oyenera zipangizo zolimba. Chifukwa chake, ndikofunikira kwambiri kupanga zinthu zosakanikirana za EVOH zomwe zimakhala ndi zigawo zambiri zoyenera kupakidwa zolimba.
Chifukwa cha kugwirizana kochepa pakati pa EVOH resin ndi HIPS resin, komanso kusiyana kwakukulu kwa resin rheology rate, mphamvu yolumikizirana pakati pa substrate ndi EVOH, zofunikira pa mphamvu zomangirira za EVOH panthawi yopangira zinthu zina, komanso kugawa kwa EVOH layer panthawi yopangira ma calendar kuti apange mapepala ophatikizika. Kufanana kwa zinthu zophatikizika ndi nkhani zazikulu zomwe zimakhudza magwiridwe antchito ndi kagwiritsidwe ntchito ka zinthu zophatikizika, komanso ndi mavuto ovuta omwe amafunika kuthetsedwa popanga zinthu zophatikizika zamtunduwu.
Chinsinsi cha ukadaulo wa multi-layer co-extrusion ndi guluu (AD). Zipangizo zophatikizika za EVOH nthawi zambiri zimakhala ndi PPEVOH, koma PP ndi EVOH sizingalumikizidwe mwachindunji ndi kutentha, ndipo guluu (AD) iyenera kuwonjezeredwa pakati pa PP ndi EVOH. Posankha guluu, ndikofunikira kuganizira guluu wa PP ngati maziko, chachiwiri ndi kufanana kwa kukhuthala kwa PP ndi EVOH, ndipo chachitatu ndi chofunikira cha mawonekedwe omangika, kuti tipewe kugawanika panthawi yokonza yachiwiri. Chifukwa chake, mapepala ophatikizidwa nthawi zambiri amakhala mapepala ophatikizana asanu (PPADEVOHADPP). /AD/EVOH/AD/R/PP, gawo lakunja ndi zinthu zatsopano za PP, ndipo zigawo zina ziwiri ndi PP yophwanyidwa yobwezeretsedwanso R(PP). Kapangidwe ka asymmetric kangagwiritsidwenso ntchito, ndipo zinthu zina (PE/HIPS, etc.) zowonjezera zitha kuwonjezeredwa kuti ziphatikizidwe. Mfundo yake ndi yofanana, ndipo njira yofanana ya multi-layer co-extrusion ikhoza kukwaniritsidwa.
Kugwiritsa ntchito
Zipangizo za EVOH zili ndi zinthu zabwino zotchingira. Kudzera mu ukadaulo wophatikizana ndi PP, PE, PA, PETG ndi zinthu zina, zimatha kusinthidwa kukhala zinthu zotchingira zopepuka zokhala ndi zigawo 5, zigawo 7, ndi zigawo 9, zomwe zimagwiritsidwa ntchito kwambiri popaka zinthu zopanda poizoni, zakumwa zotsekemera, zinthu za mkaka, nsomba zozizira ndi zinthu za nyama ndi zina zotero. M'mbali yosakhala chakudya, imagwiritsidwa ntchito popaka mankhwala, zosungunulira zosungunuka komanso zinthu zina, zokhala ndi zinthu zabwino kwambiri zotchingira, zomwe zimapangitsa kuti zinthu zisamawonongeke.
