Tun da madara shine sabon abin sha, abubuwan da ake buƙata don tsabta, ƙwayoyin cuta, zazzabi, da dai sauransu suna da matukar damuwa.Sabili da haka, akwai kuma buƙatu na musamman don buga buhunan buƙatun, wanda ya sa bugu na fim ɗin marufi na madara ya bambanta da sauran halayen fasaha na bugu.Don zaɓar fim ɗin marufi na madara, dole ne ya dace da buƙatun buƙatun, bugu, sarrafawa, ajiya da sufuri da tsabta.A halin yanzu, kayan fim ɗin da aka saba amfani da su galibi polyethylene (PE) fim ɗin haɗin gwiwa ne, wanda ke narkewa extrusion na guduro polyethylene da gyare-gyaren busa.
Nau'in fina-finai don marufi na madara:
Bisa ga tsarin sa na Layer, ana iya raba shi zuwa nau'i uku.
1. Simple marufi fim
Gabaɗaya fim ne mai Layer Layer, wanda aka samar ta hanyar ƙara wani yanki na farin masterbatch zuwa kayan polyethylene daban-daban kuma ana samar da shi ta hanyar busa kayan aikin fim.Wannan fim ɗin marufi yana da tsarin da ba shi da shinge kuma yana cike da zafi ta hanyar pasteurization (85 ° C / 30min), tare da ɗan gajeren rayuwa (kimanin kwanaki 3).
2. Baƙar fata da fari co-extrusion marufi fim tare da uku Layer tsarin
Fim ne mai ɗorewa wanda aka yi da LDPE, LLDPE, EVOH, MLLDPE da sauran resins, waɗanda aka haɗa tare da busa tare da manyan baƙar fata da fari.Baƙin masterbatch ɗin da aka ƙara a cikin rufin zafi-hatimin ciki yana taka rawar toshe haske.Wannan fim ɗin marufi yana ɗaukar matsananciyar zafin jiki nan take haifuwa da hanyoyin haifuwa na hydrogen peroxide, kuma rayuwar shiryayye a zazzabi na ɗaki na iya kaiwa kusan kwanaki 30.
3. Baƙar fata da fari co-extrusion marufi fim tare da tsarin Layer biyar
Ana ƙara shingen shinge na tsaka-tsaki (wanda ya ƙunshi manyan resins kamar EVA da EVAL) lokacin da aka hura fim ɗin.Sabili da haka, wannan fim ɗin marufi shine babban fim ɗin marufi mai shinge mai shinge tare da tsawon rairayi kuma ana iya adana shi a cikin zafin jiki na kimanin kwanaki 90.Fina-finan fina-finai na fina-finai masu launi guda uku da nau'i-nau'i masu yawa na baƙar fata da fari suna da kyawawan kaddarorin rufewar zafi, haske da juriya na iskar oxygen, kuma suna da fa'idodi na ƙananan farashi, jigilar kayayyaki masu dacewa, ƙananan sararin ajiya, da kuma aiki mai karfi.
Abubuwan da ake buƙata na fim ɗin polyethylene don samfuran kiwo:
Don saduwa da buƙatun cikar madara da bugu, ana buƙatar abubuwa masu zuwa musamman don fim ɗin polyethylene.
1. Lalata
Fim ɗin ciki da waje na fim ɗin yakamata su sami santsi mai kyau don tabbatar da cewa za'a iya cika shi da kyau akan injin mai cike da sauri ta atomatik.Don haka, madaidaicin juzu'i mai ƙarfi da tsayin daka na farfajiyar fim ɗin ya kamata ya zama ƙasa kaɗan, gabaɗaya yana buƙatar 0.2 zuwa 0.4 Santsin fim ɗin Bayan an samar da fim ɗin, wakilin zamewa yana ƙaura daga fim ɗin zuwa saman kuma ya taru cikin ƙaramin bakin ciki na uniform. , wanda zai iya rage girman juzu'i na fim ɗin kuma ya sa fim ɗin ya sami santsi mai kyau.Tasiri.
2. Ƙarfin ƙarfi
Tun da fim ɗin filastik yana ƙarƙashin tashin hankali na inji daga na'urar cikawa ta atomatik yayin aikin cikawa, ana buƙatar fim ɗin dole ne ya sami isasshen ƙarfi don hana cire shi a ƙarƙashin tashin hankali na injin cikawa ta atomatik.A cikin tsarin busa fim, yin amfani da LDPE ko HDPE barbashi tare da ƙananan narke index yana da matukar amfani don inganta ƙarfin ƙarfin ƙarfin fina-finai na polyethylene.
3. Surface wetting tashin hankali
Domin yaduwa tawada tawada, jika da kuma manne sumul a saman fim ɗin filastik polyethylene, ana buƙatar cewa yanayin yanayin fim ɗin ya kamata ya kai wani ma'auni, kuma dole ne a dogara da jiyya na corona don cimma nasara. mafi girma wetting tashin hankali, in ba haka ba zai shafi tawada a kan fim.Ƙaƙƙarfan mannewa da tsayin daka, don haka yana rinjayar ingancin abin da aka buga.Ana buƙatar gabaɗaya cewa yanayin tashin hankali na fim ɗin polyethylene ya zama sama da 38dyne, kuma yana da kyau idan zai iya kaiwa sama da 40dyne.Tun da polyethylene abu ne na al'ada wanda ba na polar polar ba, baya ƙunshi ƙungiyoyin polar a cikin tsarin kwayoyin halitta, kuma yana da babban crystallinity, ƙarancin makamashi mara ƙarfi, rashin ƙarfi mai ƙarfi, da kaddarorin sinadarai.Saboda haka, dacewa da bugu na kayan fim yana da girma sosai.Talakawa, mannewa zuwa tawada bai dace ba.
4. Hatimin zafi
Abin da ya fi damuwa game da marufi na atomatik shine matsalar fashewar jakar da ke haifar da zubewa da rufewar ƙarya.Don haka, fim ɗin dole ne ya kasance yana da kyawawan abubuwan da ke yin buhunan zafi mai ɗaukar zafi, aikin rufewa mai kyau, da kewayon rufewar zafi mai faɗi, ta yadda za a iya amfani da shi a cikin marufi.Lokacin da saurin ya canza, tasirin hatimin zafi ba ya tasiri sosai, kuma ana amfani da MLDPE azaman Layer ɗin rufe zafi don cikakken tabbatar da kwanciyar hankali na yanayin rufewar zafi da ƙarancin zafi.Wato wajibi ne a tabbatar da rufe zafi da kuma iya yanke shi da kyau don kar narkakkar ta manne da wuka.
Ƙara wani kaso na LLDPE a cikin tsarin busawa na fim na iya inganta haɓaka ƙarancin zafin jiki mai ƙarancin zafin jiki da haɓaka aikin rufewar fim ɗin, amma adadin LLDPE da aka ƙara bai kamata ya zama babba ba, in ba haka ba danko na fim ɗin polyethylene zai kasance. yayi tsayi da yawa, da kuma tsarin rufewar zafi Yana da haɗari ga gazawar wuka.Don tsarin tsarin fim ɗin, za a iya zaɓar fim ɗin marufi na tsarin da ya dace bisa ga abubuwan da ke cikin kunshin da kuma rayuwar rayuwar sa.
Lokacin aikawa: Jul-04-2022