Domin tsawaita rayuwar shiryayye na abubuwa kamar abinci da kwayoyi, da yawakayan marufidon abinci da magunguna a zamanin yau ana amfani da fina-finai masu haɗakarwa marufi. A halin yanzu, akwai nau'o'i biyu, uku, biyar, bakwai, tara, har ma da nau'ikan nau'ikan nau'ikan kayan tattarawa. Multi Layer marufi fim ne na bakin ciki fim kafa ta extruding mahara filastik albarkatun kasa zuwa mahara tashoshi lokaci guda daga guda mold budewa, wanda zai iya yin amfani da abũbuwan amfãni daga daban-daban kayan.
Multi Layermarufi fim nadigalibi sun ƙunshi haɗin polyolefin. A halin yanzu, tsarin da aka saba amfani dashi sun haɗa da: polyethylene / polyethylene, polyethylene ethylene vinyl acetate copolymer / polypropylene, LDPE / m Layer / EVOH / m Layer / LDPE, LDPE / m Layer / EVH / EVOH / EVOH / m Layer / LDPE. Ana iya daidaita kauri na kowane Layer ta hanyar fasahar extrusion. Ta hanyar daidaita kauri na shingen shinge da kuma amfani da nau'ikan kayan shinge, ana iya tsara fina-finai masu sassauƙa tare da kaddarorin shinge daban-daban. Hakanan za'a iya maye gurbin kayan Layer ɗin zafi mai sauƙi da daidaitawa don saduwa da buƙatun marufi daban-daban. Wannan nau'i mai nau'i-nau'i da nau'i-nau'i na kayan aiki masu yawa shine babban jagora don bunkasa kayan aikin fim a nan gaba.
Multi Layer marufi hada fim tsarin
Fim ɗin haɗaɗɗen marufi da yawa, ba tare da la'akari da adadin yadudduka ba, gabaɗaya an raba shi zuwa ƙasan tushe, Layer na aiki, da Layer na m dangane da aikin kowane Layer na fim ɗin.
Matsayin asali
Gabaɗaya, yadudduka na ciki da na waje na fina-finai masu haɗaka ya kamata su kasance da kyawawan kaddarorin jiki da na inji, samar da aikin sarrafawa, da Layer ɗin rufe zafi. Har ila yau, yana buƙatar samun kyakkyawan aikin rufewar zafi da aikin walda mai zafi, waɗanda suke da ƙananan ƙananan farashi, suna da goyon baya mai kyau da kuma riƙewa a kan Layer na aiki, kuma suna da mafi girman rabo a cikin fim ɗin da aka haɗa, yana ƙayyade gaba ɗaya rigidity na fim ɗin. . Abubuwan tushe sune PE, PP, EVA, PET, da PS.
Layer mai aiki
Layer na aiki nafim ɗin shirya abincishi ne mafi yawa shinge Layer, yawanci a tsakiyar Multi-Layer composite film, yafi amfani da shãmaki resins kamar EVOH, PVDC, PVA, PA, PET, da dai sauransu. Daga cikin su, da aka fi amfani da high barrier kayan su ne EVOH da PVDC. , kuma PA na gama gari da PET suna da kaddarorin shinge iri ɗaya, na kayan katangar matsakaici.
EVOH (etylene vinyl barasa copolymer)
Ethylene vinyl barasa copolymer wani abu ne na polymer wanda ya haɗu da iya aiki na ethylene polymers da kuma kaddarorin shingen gas na ethylene barasa polymers. Yana da matukar haske kuma yana da kyalli mai kyau. EVOH yana da kyawawan kaddarorin shinge don iskar gas da mai, tare da ingantaccen ƙarfin injina, elasticity, juriya na juriya, juriya mai sanyi, da ƙarfin saman ƙasa, da kyakkyawan aikin sarrafawa. Ayyukan shinge na EVOH ya dogara da abun ciki na ethylene. Lokacin da abun ciki na ethylene ya karu, aikin shingen gas yana raguwa, amma aikin juriya na danshi yana ƙaruwa, kuma yana da sauƙin sarrafawa.
Kayayyakin da aka haɗa da kayan EVOH sun haɗa da kayan yaji, kayan kiwo, kayan nama, samfuran cuku, da sauransu.
PVDC (polyvinylidene chloride)
Polyvinylidene chloride (PVDC) shine polymer na chloride vinylidene (1,1-dichlorethylene). Matsakaicin zafin jiki na homopolymer PVDC ya yi ƙasa da inda yake narkewa, yana sa ya yi wahala ya narke. Saboda haka, a matsayin marufi abu, PVDC ne copolymer na vinylidene chloride da vinyl chloride, wanda yana da kyau airtightness, lalata juriya, da kyau bugu da zafi sealing Properties.
A zamanin farko, an fi amfani da shi don kayan aikin soja. A cikin shekarun 1950, an fara amfani da shi azaman fim ɗin adana abinci, musamman tare da haɓakar fasahar tattara kayan abinci na zamani da saurin rayuwar mutane na zamani, saurin daskarewa da adana marufi, juyin juya halin dafa abinci na microwave, da haɓaka abinci da ƙari. rayuwar shiryayyen ƙwayoyi sun sanya aikace-aikacen PVDC ya fi shahara. Ana iya yin PVDC cikin fina-finai masu ƙwanƙwasa, rage yawan albarkatun ƙasa da farashin marufi. Har yanzu yana da farin jini a yau
M Layer
Saboda rashin kusanci tsakanin wasu resins na tushe da resins na aiki, ya zama dole a sanya wasu yadudduka masu mannewa tsakanin waɗannan yadudduka guda biyu don yin aiki azaman manne da samar da fim ɗin haɗaɗɗen haɗin gwiwa. Layin manne yana amfani da guduro mai ɗaure, wanda aka saba amfani da shi ya haɗa da polyolefin wanda aka dasa shi da maleic anhydride da ethylene vinyl acetate copolymer (EVA).
Maleic anhydride da aka dasa polyolefins
Maleic anhydride grafted polyolefin ana samar da shi ta hanyar dako anhydride na maleic a kan polyethylene ta hanyar extrusion mai amsawa, yana gabatar da ƙungiyoyin gefen polar akan sarƙoƙi marasa iyaka. Ita ce manne tsakanin igiya da kayan da ba na igiya ba kuma ana amfani da ita sosai a cikin fina-finai na polyolefins kamar polypropylene da nailan.
EVA (etylene vinyl acetate copolymer)
EVA yana gabatar da vinyl acetate monomer a cikin sarkar kwayoyin, yana rage crystallinity na polyethylene da inganta solubility da thermal sealing na fillers. Abubuwan da ke ciki daban-daban na ethylene da vinyl acetate a cikin kayan suna haifar da aikace-aikace daban-daban:
① Babban samfuran EVA tare da abun ciki na ethylene acetate da ke ƙasa 5% sune adhesives, fina-finai, wayoyi da igiyoyi, da sauransu;
② Babban samfurori na EVA tare da abun ciki na vinyl acetate na 5% ~ 10% sune fina-finai na roba, da dai sauransu;
③ Babban samfurori na EVA tare da abun ciki na vinyl acetate na 20% ~ 28% sune zafi narke adhesives da kayan shafa;
④ Babban samfuran EVA tare da abun ciki na vinyl acetate na 5% ~ 45% sune fina-finai (ciki har da fina-finai na noma) da zanen gado, samfuran gyare-gyaren allura, samfuran kumfa, da sauransu.
Lokacin aikawa: Juni-12-2024