Sezvo mukaka uri chinwiwa chitsva, zvinodiwa zvehutsanana, mabhakitiriya, tembiricha, nezvimwewo zvakanyanya.Naizvozvo, kunewo zvakakosha zvinodiwa pakudhindwa kwemabhegi ekurongedza, izvo zvinoita kuti kudhindwa kwemukaka kurongedza firimu kuve kwakasiyana kubva kune mamwe maitiro ehunyanzvi ekudhinda.Pakusarudzwa kwefirimu yekuputira mukaka, inofanirwa kusangana nezvinodiwa zvekurongedza, kudhinda, kugadzirisa, kuchengetedza uye kutakura uye hutsanana.Parizvino, iyo inowanzo shandiswa firimu zvinhu zvinonyanya polyethylene (PE) co-extruded firimu, iyo inonyungudutsa extrusion yepolyethylene resin uye blow molding.
Mhando dzemafirimu ekurongedza mukaka:
Zvinoenderana neyakagadzika chimiro chayo, inogona kukamurwa kuita mhando nhatu.
1. Rakareruka kurongedza firimu
Iri kazhinji firimu re-single-layer, iro rinogadzirwa nekuwedzera chimwe chikamu chewhite masterbatch kune akasiyana polyethylene zvinhu uye inogadzirwa neyakavhuvhuta firimu michina.Iyi firimu yekuputira ine isina-chipingamupinyi chimiro uye inopisa-yakazadzwa ne pasteurization (85 ° C / 30min), ine pfupi sherufu hupenyu (anenge mazuva matatu).
2. Dema uye chena co-extrusion packaging film ine matatu-layer structure
Ifirimu repamusoro-soro rakagadzirwa neLDPE, LLDPE, EVOH, MLLDPE nemamwe maresin, akaiswa pamwe chete uye akafuridzirwa neblack and white masterbatches.Iyo dema masterbatch yakawedzerwa mukupisa-chisimbiso chemukati layer inoita basa rekuvhara chiedza.Iri bhaisikopo rekurongedza rinotora tembiricha yepamusoro-soro nekukasika sterilization uye nzira dzehydrogen peroxide sterilization, uye hupenyu hwesherufu pakudziya kwekamuri hunogona kusvika mazuva makumi matatu.
3. Dema uye chena co-extrusion packaging film ine shanu-layer structure
Iyo yepakati barrier layer (inoumbwa nepamusoro-barrier resins senge EVA neEVAL) inowedzerwa kana firimu richiridzwa.Naizvozvo, iyi bhaisikopo rekurongedza ndeyepamusoro-chipingamupinyi aseptic yekurongedza firimu ine hupenyu hurefu hwesherufu uye inogona kuchengetwa pakamuri tembiricha kwemazuva angangoita makumi mapfumbamwe.Matatu-layer uye akawanda-layer dema uye chena co-extruded ekurongedza mafirimu ane yakanakisa kupisa-kuvharisa zvivakwa, chiedza uye oksijeni kuramba, uye ane zvakanakira mutengo wakaderera, kufambisa kuri nyore, nzvimbo diki yekuchengetera, uye yakasimba kuita.
Kuita zvinodiwa zve polyethylene firimu rezvigadzirwa zvemukaka:
Kuti uwane zvinodiwa zvekuzadza mukaka nekudhinda, zvinotevera zvinonyanya kudiwa kune polyethylene firimu.
1. Kupfava
Nzvimbo dzemukati nekunze dzemufirimu dzinofanirwa kuve nekutsvedzerera kwakanaka kuti ive nechokwadi chekuti inogona kuzadzwa zvakanaka pamushini wepamusoro-inomhanya otomatiki wekuzadza muchina.Naizvozvo, simba uye static friction coefficient yepasi pefirimu inofanira kunge yakaderera, kazhinji inoda 0.2 kusvika 0.4 kutsvedzerera kwefirimu Mushure mekunge firimu ragadzirwa, inotsvedza inotama ichibva mufirimu ichienda pamusoro uye inoungana kuita yunifomu nhete. , iyo inogona kuderedza zvakanyanya friction coefficient yefirimu uye kuita kuti firimu ive nekunaka kwakanaka.Mhedzisiro.
2. Kusimba simba
Sezvo iyo firimu repurasitiki riri pasi pekunetsekana kwemuchina kubva kumuchina wekuzadza otomatiki panguva yekuzadza, zvinodikanwa kuti iyo firimu inofanirwa kunge iine simba rakakwana rekudzivirira kuti isaburitswe pasi pekumanikidzwa kwemuchina wekuzadza otomatiki.Muchirongwa chekuridza firimu, kushandiswa kweLDPE kana HDPE zvimedu zvine yakaderera melt index kunobatsira zvikuru kuvandudza kusimba kwemafirimu epolyethylene.
3. Surface wetting tension
Kuti inki yekudhinda ipararire, yakanyorova uye inonamira zvakanaka pamusoro peiyo polyethylene firimu repurasitiki, zvinodikanwa kuti kushushikana kwepamusoro kwefirimu kunofanirwa kusvika kune imwe mwero, uye zvinodikanwa kuvimba nekurapa kwekorona kuti uwane yakakwirira wetting makakatanwa, zvikasadaro zvichaita kukanganisa ingi pamusoro firimu.Iko kunamatira uye kusimba kwepamusoro, nokudaro kukanganisa kunaka kwezvinhu zvakadhindwa.Zvinowanzodikanwa kuti tension yepamusoro yefirimu yepolyethylene inofanira kuva pamusoro pe38dyne, uye zviri nani kana inogona kusvika pamusoro pe40dyne.Sezvo polyethylene iri yakajairika isiri-polar polymer zvinhu, haina mapoka epolar muchimiro chayo chemolecular, uye ine yakakwirira crystallinity, yakaderera pamusoro pemahara simba, inertness yakasimba, uye yakagadzikana makemikari zvinhu.Nokudaro, kukodzera kudhindwa kwezvinhu zvemufirimu zvakanyanyisa.Murombo, kunamatira kune inki hakuna kunaka.
4. Kuvhara kupisa
Chinhu chinonyanya kunetsa nezve otomatiki firimu kurongedza idambudziko rekuputsika kwebhegi kunokonzerwa nekudonha uye kuiswa chisimbiso chenhema.Naizvozvo, iyo firimu inofanirwa kunge iine yakanaka kupisa-kuvharisa bhegi-kugadzira zvivakwa, yakanaka yekuisa chisimbiso kuita, uye yakakura kupisa-kuvharisa chisimbiso, kuitira kuti igone kushandiswa mukurongedza.Kana iyo yekumhanyisa ichichinja, kupisa kwekuisa chisimbiso hakukanganiswe zvakanyanya, uye MLDPE inowanzoshandiswa seyadzisiro yekuisa chisimbiso kuti inyatso kugadzikana kwemamiriro ekupisa ekuvhara uye kupisa kuvharika.Izvi zvinoreva kuti, zvakakosha kuve nechokwadi chekuisa chisimbiso chekupisa uye kukwanisa kucheka zvakanaka kuitira kuti resin yakanyungudutswa isanamatira kune banga.
Kuwedzera chimwe chikamu cheLLDPE mukuvhuvhuta kwefirimu kunogona kuvandudza zvakanyanya tembiricha yekupisa yekuisa chisimbiso kuita uye kusanganisa kupisa kwekuisa chisimbiso kuita kwefirimu, asi huwandu hweLLDPE hwakawedzerwa haufanirwe kunge hwakakurisa, zvikasadaro viscosity yefirimu re polyethylene ichave. yakakwira zvakanyanya, uye kupisa kwekuvhara maitiro Inowanzo kunamatira kutadza kwebanga.Nekuda kwekugadzirwa kwemufirimu, firimu rekuputira rechimiro chinoenderana chinogona kusarudzwa maererano nemhando dzakasiyana dzepakeji uye hupenyu hwayo.
Nguva yekutumira: Jul-04-2022