PP/PE/PA/PETG/EVOH Multilayer Barrier Sheet Co-extrusion Line
IParameter yobuGcisa engundoqo
| Imodeli yomgca | Imodeli ye-Extruder | Ububanzi beemveliso | Iimveliso ubukhulu | Yila imveliso ye-extrusion |
| 7 umaleko co-extrusion | 120/75/50/60/75 | 800-1200mm | 0.2-0.5mm | 500-600kg/h |
| 9 umaleko co-extrusion | 75/100/60/65/50/75/75 | 800-1200mm | 0.05-0.5mm | 700-800kg/h |
Qaphela: Iinkcukacha zinokutshintshwa ngaphandle kwesaziso sangaphambili.
Ubume bemarike yezicelo zokupakisha ze-EVOH
Kwintsimi yokupakisha ukutya okubandayo, abantu basebenzisa isinyithi okanye izinto zeglasi njengokupakishwa kokutya ukuze bahlukanise ngokufanelekileyo ukungena kwamacandelo egesi ahlukeneyo ngaphakathi nangaphandle ukuze kuqinisekiswe umgangatho wezinto eziqulethweyo kunye nexabiso lempahla. Ngenxa yokuba kukho izinto ezintathu eziphambili ezibangela ukubola kokutya: izinto zebhayoloji (i-biological enzyme reactions, njl.), imiba yeekhemikhali (ikakhulu i-oxidation yamacandelo okutya) kunye nezinto eziphathekayo (hygroscopic, drying, njl.). Ezi zinto zidlala indima kwiimeko zokusingqongileyo ezifana ne-oksijeni, ukukhanya, ubushushu, umswakama, njl., ezibangela ukonakala kokutya. Ukuthintela ukuwohloka kokutya kukuthintela ukwanda kwe-microorganisms ekudleni, ukuthintela i-oxidation yamacandelo okutya nge-oxygen, kunye nokuthintela ukufuma kunye nokugcina incasa yokuqala yokutya.
I-ethylene-vinyl alcohol copolymer, ekubhekiselwa kuyo njenge-EVOH, yaziwa njengezona zithintelo zikhulu zentlaka ezintathu zehlabathi kunye ne-polyvinylidene chloride (PVDC) kunye ne-polyamide (PA) [2]. I-EVOH inokuthintela kakhulu ukungena kwe-oksijini emoyeni ekudleni, ngaloo ndlela inqanda ukuveliswa kwee-toxins kunye nezinye izinto ezinobungozi ngenxa yokwanda kwe-microorganisms, kwaye inokuthintela ukuguqulwa kokubunjwa okubangelwa yi-oxidation, ngelixa igcina iphunga kunye nokuthintela ukungcola kwangaphandle kwephunga. Ngaphezu koko, ukungabikho kweempawu zokuthintela ukufuma kunokubuyiselwa ngezinye iileya zepololefin. Ke ngoko, izixhobo zokupakisha ze-EVOH ezininzi zinokuthintela ngokufanelekileyo ukonakaliswa kokutya kunye nokwandisa ubomi beshelufu. Ukongeza, kulula ukusetyenzwa kunye nokwenza, kwaye inokusebenza kakuhle kokusingqongileyo. Ngenxa yeempawu ezigqwesileyo zokuthintela igesi, ukungafihli, ukuqhubekeka kunye nokumelana ne-solvent ye-EVOH resin, imimandla yesicelo sayo iya iba banzi kwaye ibanzi, kwaye imfuno nayo ikhula ngokukhawuleza.
Umqobo ophezulu we-EVOH resin
1. Iimpawu zezinto eziphathekayo
Iimpawu zomqobo ze-EVOH Iipropati zomqobo zezixhobo ze-polymer zibhekisela kwikhono lokukhusela imveliso kwiigesi ezincinci ze-molecular, i-liquids, umphunga wamanzi, njl njl. Iintlobo ze-resin ezisetyenziswa ngoku eziqhelekileyo ezineempawu ezintle zomqobo ziquka: EVOH, PVDC, PAN, PEN, PA kunye ne-PET.
2. Xa i-EVOH isetyenziswe njengento ephezulu yokuthintela, ngokuqhelekileyo ithatha i-multi-layer composite structure. Izinto ezisetyenziswa ngokuqhelekileyo ezidibeneyo: i-PP, i-HIPS, i-PE, i-EVOH, i-AD, kunye ne-AD i-adhesive kwisakhiwo. Isakhiwo esihlanganisiweyo se-multi-layer sinokunika umdlalo ogcweleyo kwiimpawu zempahla nganye, ukuphucula ukunyanzeliswa kwamanzi kwe-EVOH, kwaye ufumane isithintelo esiphezulu sezinto eziphathekayo kunye neempawu ezintle kakhulu. Uninzi lwazo lwalusetyenziselwa ukupakishwa okuguquguqukayo kwixesha elidlulileyo, kodwa i-resins edibeneyo efana ne-PP, i-PE, kunye ne-PA ayilula ukuyibetha ngenxa yokuqina kwayo okuhle kunye nokungahambi kakuhle, okunciphisa ukusetyenziswa kwabo kwintsimi yokupakisha okuqinileyo, ngakumbi kwiimveliso zokuzalisa i-intanethi. I-HIPS ye-polystyrene enganyangekiyo kwimpembelelo inobulukhuni obuhle kunye neempawu ezibalaseleyo zokubumba, ezifanelekileyo ukubethelwa kwaye zilungele izinto zokupakisha ezinzima. Ke ngoko, kungxamiseke ngakumbi ukuphuhlisa ngamandla izinto ezihlanganisiweyo ze-EVOH ezithintelayo ezifanelekileyo ukupakishwa kanzima.
Ngenxa yokungahambelani kakuhle phakathi kwe-resin ye-EVOH kunye ne-resin ye-HIPS, kunye nomahluko omkhulu kwireyithi ye-resin rheology, amandla okubambisana phakathi kwe-substrate kunye ne-EVOH, iimfuno zeempawu ezixinzelelekileyo ze-EVOH ngexesha lokubunjwa kwesibini, kunye nokusabalalisa kwe-EVOH ngexesha le-calendering ukuvelisa amaphepha adibeneyo. isonjululwe xa kuveliswa olu hlobo lwezinto ezidibeneyo.
Isitshixo kwi-multi-layer co-extrusion technology yi-adhesive (AD). Izinto zokupakisha ezihlanganisiweyo ze-EVOH zihlala zibandakanya i-PPEVOH, kodwa i-PP kunye ne-EVOH ayikwazi ukudibanisa ngokuthe ngqo kwi-thermal, kwaye i-adhesive (AD) kufuneka yongezwe phakathi kwe-PP kunye ne-EVOH. Xa ukhetha i-adhesive, kuyimfuneko ukuqwalasela i-adhesive ye-PP njengento esisiseko, okwesibini kukuhambelana kwe-viscosity ye-melt ye-PP kunye ne-EVOH, kwaye okwesithathu yimfuneko yeempawu ezinqabileyo, ukwenzela ukuba ugweme i-delamination ngexesha lokucubungula okwesibini. Ke ngoko, amaxwebhu adibeneyo akhutshiweyo ubukhulu becala angama-five-layer co-extruded sheets (PPADEVOHADPP). / AD/EVOH/AD/R/PP, umaleko ongaphandle yiPP imathiriyeli entsha, kunye nezinye iileya ezimbini ziyi-PP ecunyuziweyo izinto ezihlaziyiweyo R (PP). Isakhiwo se-asymmetric singasetyenziselwa, kunye nezinye izinto (PE / HIPS, njl.) I-extruders inokuthi ifakwe kwi-co-extrusion. Umgaqo uyafana, kwaye indlela yokudibanisa i-multi-layer co-extrusion inokufezekiswa.
Isicelo
Izinto ze-EVOH zineempawu ezintle zomqobo. Ngokusebenzisa itekhnoloji ye-co-extrusion kunye ne-PP, i-PE, i-PA, i-PETG kunye nezinye izinto, inokucutshungulwa kwi-5-layer, 7-layer, kunye ne-9-layer high-barrier lightweight lightweight packaging, esetyenziswa kakhulu kwipakethe ye-aseptic, i-jelly drinks, iimveliso zobisi, intlanzi epholileyo kunye nemveliso yenyama yokupakisha, njl njl. ukupakishwa kunye namanye amasimi, aneempawu ezibalaseleyo zomqobo, eziphucula kakhulu ubomi beshelufu yeemveliso.
