Cov hnab ntim khoom rau cov ntaub so ntswg hauv tsev feem ntau yog ua los ntawm cov polyethylene qis (LDPE) lossis copolymer polypropylene (CPP), muab rau lawv cov qauv mos, matte nrog kev tiv thaiv dej noo thiab kev tsim kua muag los tiv thaiv cov ntaub so ntswg los ntawm cov dej noo.

Siv cov cim hloov xim laser UV rau ntawm txheej sab nraud, hloov cov qauv molecular ntawm lub txheej kom tsim cov cim hnub tsim khoom meej. Txoj kev no tsis siv tau ua kom cov cim tsis yooj yim hnav thiab ploj mus uas nyeem tau raws sijhawm.

Cov cim laser UV rau ntawm txheej PET sab nraud ntawm cov hnab ntim khoom PET/AL/PE siv cov teeb laser muaj zog heev los ua rau muaj cov tshuaj tiv thaiv photochemical thiab cov teebmeem thermal me ntsis. Thaum siv rau txheej dawb, lub laser hloov pauv cov qauv molecular, tig qhov chaw grey es tsis yog tsuas yog tshem cov txheej.

Txoj cai hloov xim no ua kom muaj cov cim meej thiab ruaj khov, feem ntau siv rau kev luam tawm hnub tsim khoom thiab cov lej ua haujlwm. Cov cim tseem tsis yooj yim hnav thiab tsis ploj, nyeem tau yooj yim txawm tias siv ntev lossis nyob rau hauv ib puag ncig hnyav.

Feem ntau cov ntaub qhwv huv yog ua los ntawm cov yas polyethylene (PE)/polypropylene (PP) uas muaj qhov ywj pheej zoo heev rau kev ncab thiab kaw. Nws muaj cov qauv matte thiab xis nyob, nws tiv taus dej noo thiab plua plav, tiv thaiv cov khoom zoo thaum tseem khaws lub zog ntawm cov ntaub qhwv.

Cov yeeb yaj kiab sib xyaw no txhawb nqa UV laser cim, qhov twg lub laser ua rau muaj kev cuam tshuam photochemical hauv cov txheej txheej, hloov nws cov xim los tsim cov cim grey ntawm qhov chaw dawb rau hnub tsim khoom thiab cov lej pawg. Txoj kev no ua kom ntseeg tau tias cov cim meej, ruaj khov uas tseem tsis ploj txawm tias thaum lub sijhawm khaws cia thiab thauj mus los ntev.

Cov hnab ntim khoom noj uas muaj qhov saum npoo du thiab dawb, ua los ntawm ntawv ci txhuas (AL) thiab PET composite, feem ntau siv rau kev ntim khoom noj uas tiv taus dej noo. Cov hnab no muaj lub ci ntsa iab zoo li hlau thiab muaj cov qauv matte, uas ua rau cov dej noo, tiv taus oxidation, thiab tiv taus lub teeb, ua kom cov khoom noj tseem tshiab thiab nkig thaum thauj thiab khaws cia.

Feem ntau siv rau cov taum kas fes, tshuaj yej, txiv ntoo qhuav, cov txuj lom, thiab cov khoom noj txom ncauj uas npaj txhij noj, cov hnab no ua rau cov khoom noj tshiab thiab tsw qab. Cov cim laser fiber tshem tawm cov txheej txheej saum npoo, qhia txog cov xim tob dua los tsim cov cim hnub tsim khoom thiab cov lej pawg uas pom tseeb, ruaj khov uas tiv taus kev hnav thiab ploj mus.

Cov hnab ntim khoom noj feem ntau yog ua los ntawm BOPP/PE (biaxially oriented polypropylene/polyethylene) composite khoom. Lub txheej sab nraud BOPP muaj kev pom tseeb siab thiab kev luam tawm zoo heev, ua rau pom cov noodles thaum tseem tiv taus dej noo kom tshiab. Lub txheej sab hauv PE yog mos, tsis muaj tshuaj lom, thiab muaj kev nyab xeeb rau zaub mov, nrog rau cov khoom kaw cua sov kom ntseeg tau tias lub foob ruaj ntseg thiab tiv taus dej noo.

Ib qho chaw dawb ntawm qhov chaw BOPP yog tsim los rau kev cim UV laser. Siv lub hauv paus ntsiab lus hloov xim laser, xim ntawm cov txheej txheem raug hloov pauv kom luam tawm hnub tsim khoom thiab cov lej ua haujlwm kom meej yam tsis tau tho qhov ntim khoom. Cov cim ruaj khov thiab tsis yooj yim hnav ua kom cov khoom muaj kev nyab xeeb thaum thauj thiab khaws cia.

Cov thev naus laus zis UV laser cim siv rau ntawm daim ntawv lo PET qhwv ntawm cov fwj ntxuav ntsej muag cylindrical, kom ntseeg tau tias cov cim hnub tsim khoom meej ntawm cov nplaim nkhaus. Lub laser ua haujlwm los ntawm lub tshuab hloov xim, qhov twg cov teeb pom kev zoo siab ua rau muaj kev cuam tshuam photochemical, hloov pauv cov qauv molecular ntawm qhov chaw PET kom tsim cov cim grey-dawb lossis tsaus yam tsis tas tshem cov khoom siv.

Txoj kev no zoo tagnrho rau cov nplaim nkhaus, uas muaj qhov cuam tshuam tsawg los ntawm cua sov kom tiv thaiv kev puas tsuaj lossis kev hloov pauv ntawm qhov chaw.

Cov hnab me me rau cov kua txiv hmab txiv ntoo feem ntau yog ua los ntawm cov khoom sib xyaw PET/AL/PE. Cov txheej PET sab nraud yog cov khoom siv ruaj khov thiab tsis yooj yim hnav, cov txheej ntawv ci txhuas (AL) thaiv lub teeb, oxygen, thiab dej noo, thaum cov txheej PE sab hauv ua kom cov zaub mov muaj kev nyab xeeb thiab kaw.

Yuav kom cim hnub tsim khoom thiab tus lej ntawm cov khoom, UV laser marking raug siv rau ntawm txheej sab nraud ntawm PET. Lub laser ua rau muaj kev cuam tshuam photochemical uas hloov pauv qhov qauv molecular ntawm PET, tsim cov cim grey lossis tsaus yam tsis tau tho qhov ntim khoom. Txoj kev no ua kom muaj cov cim meej, tsis yooj yim hnav thaum tseem khaws cia qhov kev ua tiav ntawm cov ntawv ci txhuas thiab PE txheej, tiv thaiv kom tsis txhob muaj kua txiv tawm.