III. Kev tsim qauv ntawm daim ntawv khob
A. Sab hauv txheej tshuab ntawm cov ntawv khob
1. Kev txhim kho cov dej tsis zoo thiab cov khoom siv rwb thaiv tsev
Sab hauv txheej tshuab yog ib qho ntawm cov qauv tsim ntawm cov ntawv khob, uas tuaj yeem txhim kho cov dej tsis zoo thiab thermal rwb thaiv tsev ntawm cov khob.
Hauv kev tsim cov ntawv khob, ib txheej ntawm polyethylene (PE) txheej feem ntau yog siv rau hauv lub khob ntawv. Cov txheej no muaj kev ua haujlwm zoo ntawm cov dej tsis zoo. Nws tuaj yeem tiv thaiv cov dej haus los ntawm kev nkag mus rau sab hauv ntawm lub khob ntawv. Thiab nws kuj tuaj yeem tiv thaiv taukhob ntawvlos ntawm deforming thiab tawg. Nyob rau tib lub sijhawm, PE txheej kuj tseem tuaj yeem muab cov nyhuv rwb thaiv tsev. Nws tuaj yeem tiv thaiv cov neeg siv tsis txhob hnov qab kub dhau thaum tuav khob.
Ntxiv nrog rau PE txheej, kuj tseem muaj lwm cov ntaub ntawv txheej tshiab dav siv hauv khob ntawv. Piv txwv li, polyvinyl cawv (PVA) txheej. Nws muaj cov dej tsis zoo thiab cov dej tsis zoo. Yog li, nws tuaj yeem ua kom zoo rau sab hauv ntawm lub khob ntawv kom qhuav. Tsis tas li ntawd, polyester amide (PA) txheej muaj cov pob tshab siab thiab ua haujlwm kub sealing. Nws tuaj yeem txhim kho cov tsos zoo thiab kev ua haujlwm kub sealing ntawm daim ntawv khob.
2. Kev Nyab Xeeb Kev Nyab Xeeb Khoom Noj
Raws li lub thawv uas siv los tuav cov zaub mov thiab dej haus, cov khoom siv txheej txheej sab hauv ntawm lub khob ntawv yuav tsum ua raws li cov qauv kev nyab xeeb khoom noj. Qhov no ua kom cov neeg tuaj yeem siv tau yam nyab xeeb.
Cov khoom siv txheej txheej sab hauv yuav tsum tau txais cov ntawv pov thawj kev nyab xeeb ntawm zaub mov. Xws li FDA (Food and Drug Administration) ntawv pov thawj, EU zaub mov tiv tauj cov ntaub ntawv pov thawj, thiab lwm yam. Cov ntawv pov thawj no xyuas kom meej tias cov khoom txheej hauv lub khob ntawv tsis ua rau cov khoom noj thiab dej haus. Thiab nws tseem yuav tsum tau ua kom ntseeg tau tias lawv tsis tso cov tshuaj phem, ua kom muaj kev noj qab haus huv thiab kev nyab xeeb ntawm cov neeg siv.
B. Kev tsim tshwj xeeb ntawm cov khob ntawv
1. Kev tsim kho hauv qab
Lub hauv qab reinforcement tsim ntawm lubkhob ntawvyog los txhim kho lub zog ntawm lub khob ntawv. Qhov no tuaj yeem tiv thaiv lub khob ntawv los ntawm kev sib tsoo thaum lub sijhawm sau thiab siv. Muaj ob hom kev tsim kho hauv qab: lub hauv qab folded thiab ib qho ntxiv hauv qab.
Folding hauv qab yog ib qho qauv tsim uas siv cov txheej txheem folding hauv qab ntawm lub khob ntawv. Ntau txheej ntawm daim ntawv raug kaw ua ke los tsim cov qauv hauv qab muaj zog. Qhov no tso cai rau lub khob ntawv tuaj yeem tiv taus qee qhov ntawm lub ntiajteb txawj nqus thiab siab.
Ib qho ntxiv hauv qab yog ib qho qauv tsim uas siv cov ntaub ntawv tshwj xeeb lossis cov khoom siv hauv qab ntawm lub khob ntawv kom muaj zog ntawm cov qauv. Piv txwv li, nce lub thickness ntawm hauv qab ntawm lub khob ntawv los yog siv cov ntaub ntawv uas ruaj khov dua. Cov no tuaj yeem txhim kho lub zog hauv qab ntawm lub khob ntawv thiab txhim kho nws txoj kev ua haujlwm siab.
2. Kev siv lub thawv ntim nyhuv
Cov khob ntawv feem ntau yog muab tso rau hauv cov thawv thaum thauj thiab khaws cia. Qhov no tuaj yeem txuag qhov chaw thiab txhim kho kev ua haujlwm. Yog li ntawd, qee cov qauv tsim tshwj xeeb yog siv rau cov khob ntawv. Qhov no tuaj yeem ua tiav lub thawv ntim zoo dua.
Piv txwv li, tus qauv tsim ntawm lub khob ntawv tuaj yeem ua rau hauv qab ntawm lub khob npog sab saum toj ntawm lub khob ntawv tom ntej. Qhov no ua rau nws yooj yim rau cov khob ntawv kom haum ua ke thiab txuag chaw. Tsis tas li ntawd, qhov tsim nyog tsim ntawm qhov siab thiab txoj kab uas hla ntawm daim ntawv khob tuaj yeem txhim kho kev ruaj ntseg ntawm daim ntawv khob stacking. Qhov no tuaj yeem zam qhov xwm txheej tsis ruaj khov thaum lub sijhawm txheej txheem stacking.
Cov txheej txheem txheej txheej sab hauv thiab cov qauv tsim tshwj xeeb ntawm cov khob ntawv tuaj yeem txhim kho lawv txoj haujlwm thiab kev ua haujlwm. Los ntawm kev nruam ntej thiab kev txhim kho, cov khob ntawv tuaj yeem ua tau zoo dua rau tib neeg cov kev xav tau ntawm cov khoom noj khoom haus. Ntxiv mus, nws tuaj yeem muab kev nyab xeeb, yooj yim, thiab ib puag ncig tus phooj ywg siv kev paub.
