Nkhani
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Kumvetsetsa Njira Yopangira Matumba Ophatikizana
2025-10-30
1. Kusankha Zinthu: "Maziko a Uinjiniya" wa Mapaketi Ophatikizana
Pakatikati mtengo wa compositeMatumba Ogulira Kugwirizana kwa zinthu zokhala ndi zigawo zambiri, mofanana ndi momwe nyumba imafunira kuphatikiza makoma akunja, zitsulo, ndi makoma amkati. Gawo loyamba ndikufanizira bwino kuphatikiza kwa zinthu zoyambira:
- Gawo lakunjaZipangizo monga PET (Polyethylene Terephthalate) ndi BOPP (Biaxially Oriented Polypropylene) amasankhidwa chifukwa cha kukana kutentha kwambiri komanso kusindikizidwa kwawo. Amayang'anira mawonekedwe ndi chitetezo cha kuwonongeka. Kupaka Chakudya, PET imagwiritsidwa ntchito kwambiri kuti ipange zotsatira zosindikiza zowala kwambiri.
- Gawo Loletsa Pakati: Kutengera ndi zofunikira, zojambulazo za aluminiyamu (mpweya ndi chotchinga cha kuwala), EVOH (Ethylene Vinyl Alcohol Copolymer, chotchinga cha okosijeni wambiri), kapena filimu yopangidwa ndi aluminiyamu (njira yotsika mtengo) imasankhidwa. Ma phukusi a mankhwala nthawi zambiri amagwiritsa ntchito zojambulazo za aluminiyamu + kuphatikiza kwa PET kuti awonjezere chitetezo.
- Gawo LamkatiZipangizo zotenthetsera kutentha monga YAYANKHA (Polyethylene) ndi CPP (Cast Polypropylene) ndi ofunikira. Kuti agwirizane mwachindunji ndi chakudya, ayenera kutsatira miyezo yachitetezo monga EC No.1935/2004 ya EU.
Kusankha zomatira ndi wofunikanso kwambiri. Magulu omatira opanda zosungunulira zachilengedwe afala kwambiri m'makampani azakudya kuti achotse zotsalira za benzene, ndipo kulemera kwa zokutira kumayendetsedwa pa 3-5g/㎡ kuonetsetsa kuti mgwirizano uli wolimba.
2. Njira Zapakati: Magawo Anayi Ofunika Kwambiri Kuyambira Kupanga Ma Lamination Mpaka Kupanga Matumba
▪Kukonza ndi Kuphimba Pansi pa Substrate
Zida zogwiritsira ntchito Kusintha mphamvu ndi kuyeretsa pamwamba kaye kuti muchotse magetsi osasinthasintha ndi zinyalala. Pa gawo lophimba, zida zolondola kwambiri zimayika zomatira mofanana pa substrate. Chophimba chonyowa chimagwiritsidwa ntchito kwambiri pa zinthu zopangidwa ndi mapepala ndi pulasitiki, pomwe chophimba chouma chimagwiritsa ntchito zinthu zopangidwa ndi pulasitiki. Cholakwika cha kulondola kwa chophimba chiyenera kulamulidwa mkati mwa ±0.1g/㎡.
▪ Kupaka Mafuta: Chinsinsi Chodziwira Mphamvu
Ma substrates okhala ndi zigawo zambiri Amalowetsedwa mu makina opaka utoto ndipo amalumikizidwa kudzera mu kukanikiza kotentha (kutentha: 80-120℃) kapena kukanikiza kozizira. Pa kukanikiza kouma, kupanikizika kumayendetsedwa pa 2-3MPa, pomwe kukanikiza kopanda zosungunulira kumadalira malo opumira kuti achepetse thovu la mpweya. Pambuyo pa kukanikiza, zipangizozo zimatumizidwa ku chipinda chochiritsira (kutentha: 40-50℃) kwa maola 24-48 kuti guluu lizigwira bwino ntchito komanso kuti lisawonongeke pambuyo pake.
▪ Kusindikiza ndi Kudula Ma Die
Kusindikiza kwa gravure ukadaulo umagwiritsidwa ntchito popanga mapangidwe. Kupaka Chakudya, inki yodyedwa imafunika. Gawo lodulira die limagwiritsa ntchito zida zowongolera manambala podula molondola, ndi cholakwika chosapitirira ±0.5mm, komanso kukonza zinthu monga mizere ndi mabowo osavuta kung'amba.
▪ Kutseka Kutentha kwa Thumba: Magawo Atatu Odziwira Kutseka
Mtundu wa ndodo Kutseka kutentha ndi njira yodziwika bwino, yomwe imafuna kuwongolera molondola "kutentha-nthawi-kupanikizika" katatu:
- Kutentha kotseka kutentha: 120-150℃ pa zipangizo za PE, ndipo kunawonjezeka kufika pa 160-180℃ pa zipangizo za CPP;
- Nthawi yotseka kutentha: yolamulidwa pa 0.5-1 sekondi;
- Kupanikizika: kumasungidwa pa 20-30N/cm².
Magawo atatuwa ayenera kukhala olinganizidwa bwino. Mwachitsanzo, kutentha kukakwera, nthawi iyenera kuchepetsedwa kuti tipewe vuto la "kudula mizu" lomwe limachepetsa mphamvu.
3. Kuwongolera Ubwino: "Chida Chozimitsira Moto" Mu Ndondomeko Yonse
Pamaso Kusunga zinthu zopangira, mayeso amachitika pa kufanana kwa makulidwe a substrate (cholakwika ≤5%) ndi kuchuluka kwa zomatira za VOC (Volatile Organic Compounds). Pa nthawi ya lamination, mphamvu ya bonding imayesedwa ndikuyesedwa maola awiri aliwonse, zomwe zimafuna kutsatira muyezo wa makampani wa ≥3N/15mm. Zogulitsa zomalizidwa ziyenera kupambana mayeso atatu ofunikira:
- Kuyesa kutsekeka (kusatulutsa mpweya kudzera mu njira yoipa yokakamiza);
- Kuyesa mphamvu ya kuboola (≥8N);
- Mayeso a mphamvu yotseka kutentha (osachotsa delamination).
Mavuto ofala Zingathe kuthetsedwa pogwiritsa ntchito njira zoyezera: Ma thovu a mpweya pakati pa zigawo akhoza kuchotsedwa powonjezera mlingo wa vacuum kapena kuwonjezera kulemera kwa chophimba; mphamvu yokwanira yotseka kutentha imafuna kuwona ngati mphamvu yomangira ikukwaniritsa miyezo, ndikuyika zomatira zowonjezera ngati pakufunika kutero.
4. Kusintha kwa Ntchito: Kugwirizana kwa Zinthu ndi Malingaliro Othandiza
Magawo osiyanasiyana ali ndi zofunikira zosiyanasiyana pa ndondomekoyi:
- Chakudya kusunga zinthu zatsopano Chikwamas imagwiritsa ntchito kapangidwe ka "PET/aluminized film/PE", komwe kali ndi oxygen transmission rate (OTR) ya ≤1cm³/(m²・24h);
- zamagetsi Kuyika zinthu kumafuna mafilimu oletsa kusinthasintha, ndipo kukana kwa pamwamba kumayendetsedwa pa 10⁸-10¹¹Ω;
- Kupaka mankhwala imagwiritsa ntchito kuphatikiza kwa "nayiloni/PE", komwe kuli ndi mphamvu yoboola ≥15N.