Njengoko ukuveliswa okuzinzileyo kunye nobuchwepheshe bokuprinta okuluhlaza bufumana amandla kwihlabathi liphela, ishishini lokuprinta kunye nokupakisha lidlula kutshintsho olukhulu oluya kwimveliso enoxanduva lokusingqongileyo. Imithetho engqongqo yokukhupha i-VOC, efana neSicwangciso sokuSebenza saseTshayina soLawulo oluPheleleyo lweeCompounds ze-Volatile Organic kwiMizi-mveliso ephambili, kunye nokuhlolwa kwe-green chain yabanini beempawu, kwenze iinkqubo ze-inki ezingena-benzene (nezingenayo i-ketone) zibe yimfuneko enyanzelekileyo kunokuba zibe lukhetho lokuzithandela.

Kubavelisi beinki, umngeni ophambili ukho kwimpikiswano ebalulekileyo: indlela yokuphelisa ngokupheleleyo izinyibilikisi ezisebenza kakuhle ezisekelwe kwi-benzene ngelixa ugcina—okanye uphucula—ukuncamathela, amandla okugquma, kunye nokuprintwa kwiifilimu zeplastiki ezinamandla aphantsi njenge-BOPP. Kolu tshintsho, i-polypropylene ekhlorini I-resin (CPP), esele isaziwa njengomkhuthazi wokunamathela osebenzayo, ivela njengesixhobo esiphambili esivumela izisombululo zokuprinta ezinobuhlobo nokusingqongileyo ngenxa yokuziqhelanisa kwayo okugqwesileyo kwiifomyula ze-inki ezingena-benzene.

Phantsi koxinzelelo oluphindwe kabini lokufaka izinto ezikhaphukhaphu kunye neemeko zokuhambisa ezifuna umgudu, abavelisi abaninzi beefilimu ze-polyethylene (PE) bajongene nengxaki esebenzayo. Abasebenzisi bokugqibela bayaqhubeka nokuphakamisa iimfuno zokumelana nokubhoboza kunye namandla okukrazula, ngelixa iindlela zokuguqula eziqhelekileyo—ezifana nokwandisa ubukhulu befilimu okanye ukongeza izinto ezitshintshayo—nokuba zinyusa iindleko zezinto okanye zibeke emngciphekweni ukucaca kwefilimu, ubumsulwa, kunye nokuphindeka kwayo.

Njengoko iindlela zemveli zokuguqula zifikelela kwinqanaba lazo lokusebenza, iteknoloji yokuguqula ebonakalayo evela kubunjineli bezinto eziphambili—ukudibanisa imisebe ye-electron—iyavela njengesisombululo esiphumelelayo. Ngendlela yayo eyahlukileyo “yokuqinisa ngaphandle kokongeza”, ukudibanisa umqadi we-electronIbonelela ngendlela efanelekileyo yorhwebo yokuphucula kakhulu iipropati zoomatshini zeefilimu zokupakisha ze-PE ngaphandle kokulahla uzinzo okanye ukhuseleko lwemveliso.

Njengoko imithetho yokusingqongileyo yehlabathi iqhubeka nokuqina kwaye amashishini afana neemoto, ezonyango, kunye nemveliso ephucukileyo ebeka iimfuno eziphezulu ekusebenzeni nasekukhuselekeni kwezinto, iiplastiki eziqhelekileyo zijongene noxinzelelo olungakaze lubonwe ngaphambili lokuguquka. Ngokukodwa, imiqathango kwii-phthalates ezithile phantsi kwemithetho efana ne-EU REACH kunye ne-US TPCH, kunye nolindelo olukhulayo lokumelana nobushushu, ukuqina, kunye nobuthi obuphantsi kwiimveliso zokusetyenziswa, zikhawulezisa utshintsho olusisiseko ekukhethweni kwezinto zeplastiki.

Kwimeko enjalo, TOPM(iTetraisooctyl Pyromellitate) ivele ngokukhawuleza njengesisombululo esithandwayo kwizicelo ezifuna amandla, ngenxa yokusebenza kwayo okugqwesileyo iyonke. Ngaphezu nje kwe-plasticizer eyahlukileyo, iTOPM imele isisombululo sezinto ezicwangcisiweyo ezenzelwe ukuhlangabezana neemfuno ezidibeneyo zokumelana nobushushu obuphezulu, ukhuseleko oluphuculweyo, kunye nobomi benkonzo ende.

Kwizicelo ezifana nokupakisha izithintelo ezicocekileyo kwizixhobo zonyango, ukhuseleko lobutsha kwiimbotyi zekofu zexabiso eliphezulu, kunye nokupakisha okunobuthathaka kumswakama kwiinxalenye ze-semiconductor, ukusebenza kwezithintelo lukhuseleko lokugqibela olukhusela umgangatho wemveliso kunye nexabiso. Izixhobo ezinomqobo ophezulu ezifana ne-polyvinylidene chloride (PVDC) kunye i-ethylene–vinyl alcohol copolymer(EVOH) zaziwa ngokubanzi ngeempawu zazo ezibalaseleyo zokuthintela igesi kunye nokufuma.

Nangona kunjalo, kwiindawo zokuvelisa nezokusetyenziswa kwehlabathi lokwenyani, ezi nzuzo zangaphakathi zihlala zithintelwa ziziphene zokucubungula, ukuthambekela kwiimeko zendalo, kunye nesidingo sokulinganisela ukusebenza kunye neendleko zemveliso. Xa iindlela zokuphucula zemveli—ezifana nokugquma umphezulu, izakhiwo ezininzi, okanye ukuxuba i-polymer—zifikelela kwimida yazo yobugcisa, ukukhanyiswa kwemisebe ye-electronivela njengeteknoloji esebenzayo yokuguqula umzimba eqinisa ukusebenza kwemiqobo kwinqanaba leemolekyuli.

Kwiinkqubo zokupakisha ezifuna amandla ezifana nokuhanjiswa kokutya okutsha okubandayo, ukupakisha kwezonyango okucocekileyo, kunye nokugcinwa kokutya okulungiselelwe ukutyiwa okuphezulu, iifilimu zesiqhelo zokunciphisa zihlala zihlangabezana nemida yokusebenza. Iingxaki eziqhelekileyo ziquka ukuqhekeka kunye nokuqhekeka ngexesha lokuthuthwa kobushushu obuphantsi, ubukhulu obungalinganiyo ngexesha lokuncipha kobushushu, kunye nokulahlekelwa bukuqina okuqhubekayo emva kokugcinwa ixesha elide, okunokukhokelela ekugqibeleni ekungasebenzi kakuhle kwephakheji.

Umceli mngeni ophambili kubavelisi yindlela yokuphucula amandla oomatshini kunye nokuthembeka kwexesha elide kweefilimu ezinciphileyo ngaphandle kokubeka emngciphekweni ukucaca kokukhanya, ukuthobela okusingqongileyo, okanye ukusebenza kakuhle kweendleko. Ukukhanya kwe-electron acceleratorItekhnoloji ibonelela ngesisombululo esisebenzayo ngokuvumela ukuguqulwa kwenqanaba leemolekyuli zezinto zepolymer ezilawulwayo, nto leyo enika uphuculo olusisiseko ekusebenzeni kwefilimu enciphileyo.

Kwihlabathi lezinto zokupakisha ezikumgangatho ophezulu, i-EVOH (I-Ethylene-Vinyl Alcohol Copolymer) ibe yinto ebalulekileyo ekuqinisekiseni ukuba ukutya kutsha, ukhuseleko lwamayeza, kunye nokuzinza kweemveliso zoshishino, ngenxa yeempawu zayo ezibalaseleyo zokuthintela. Ingakumbi kwizakhiwo zefilimu ezidityaniswe ngamalayelo amaninzi, umaleko wesithintelo se-EVOH udlala indima ebalulekileyo "yomgcini-sango". Njengoko iimfuno zemarike zobomi obude kunye nokusebenza okuphuculweyo kwesithintelo ziqhubeka nokunyuka, ukonyusa ubukhulu bomaleko we-EVOH kube sisisombululo esiphambili. Nangona kunjalo, oku akupheleli nje ekongezeni izinto ezingaphezulu—luphuculo olupheleleyo olubandakanya isayensi yezinto, ubunjineli beenkqubo, kunye nokusebenza kakuhle kweendleko.

Kwihlabathi lokupakisha okunemiqobo emininzi, i-EVOH (I-Ethylene-Vinyl Alcohol Copolymer() ixatyiswa kakhulu ngenxa yamandla ayo akhethekileyo okuthintela ioksijini. Isetyenziswa kakhulu kumashishini apho ukugcinwa nokhuseleko kubaluleke kakhulu, njengokupakisha ukutya, imveliso entsha, ukutya okulungisiweyo, kunye nezixhobo zonyango. Iifilimu ze-EVOH Baphumelela kakhulu ekusebenzeni kakuhle komqobo weoksijini, bajongene nemingeni yokuxhathisa umphunga wamanzi—ingakumbi kwiindawo ezinobushushu obuphezulu, ezinomswakama ophezulu. Zithini izizathu zesayensi ezibangela le ngxaki, kwaye kutheni iifilimu ze-EVOH zingenakulawula zombini ngempumelelo?

Kwishishini lokupakisha elikumgangatho ophezulu, imida yokusebenza kwezinto iyaqhubeka ichazwa ngokutsha. Njengenye yeeresini ezintathu eziphambili ezinemiqobo ephezulu, I-Ethylene-Vinyl Alcohol Copolymer(EVOH) ivele njenge "khaka legolide" elikhusela umgangatho wokutya, imveliso entsha, kunye nezixhobo zonyango. Ngeempawu ezibalaseleyo zokuthintela ioksijini, ukucaca okuphezulu, kunye nokhuseleko lokusingqongileyo, i-EVOH iyimfuneko kwizicelo ezifuna ukhuseleko oluhlala ixesha elide. Nangona kunjalo, ukuphilizeka kwayo emanzini kunye nemingeni yokuvala ubushushu iphakamisa ukhetho lweendlela zokucubungula ukusuka "kwinyathelo nje lokuvelisa" ukuya kwinto ebalulekileyo emisela ukusebenza kwayo.

Kwishishini lanamhlanje lokupakisha, elifuna ucoceko olukhethekileyo, ukhuseleko, kunye nokuzinza, Utywala lwe-Ethylene-VinylIifilimu ze-(EVOH) kunye nePolyvinyl Alcohol (PVA) zivele njengeetekhnoloji ezimbini eziphambili zokufezekisa ukusebenza okuphezulu. Ngenxa yemingeni ebangelwa kukuguquguquka kwekhonkco lokubonelela ngeenkonzo kwihlabathi liphela, imithetho engqongqo yokusingqongileyo, kunye nokunyuka kwemfuno yokupakisha "okunokurisayikilishwa kwezinto enye", ukuqonda indlela yokusebenzisa ezi zixhobo ngempumelelo kuba licebo elibalulekileyo kubavelisi bokupakisha abaguquguqukayo kunye nabanini beempawu abafuna ukuhlala bekhuphisana.

Ngenxa yamandla adibeneyo okugxininisa ngakumbi ekuzinzeni kunye nokwanda kwemfuno yezixhobo ezisebenza kakuhle, i-ethylene-vinyl alcohol copolymer(EVOH) iguqukele ekubeni zizinto ezithintelayo ezikhethekileyo yaba ngumdlali ophambili oguqula amashishini ehlabathi, kuquka ukupakisha, ukhathalelo lwempilo, kunye neemoto. Ukuqonda izinto eziphambili ezibangela uphuhliso lwayo lwexesha elizayo kubalulekile ukuze kusetyenziswe isizukulwana esilandelayo sezicelo zezinto kunye namathuba emarike.