Lub hnab ntim retortnrog BOPA // LDPE qauv yog dav siv nyob rau hauv ntim ntawm pickles thiab xyoob tua.BOPA // LDPE lub hnab ntim khoom tiag tiag muaj cov kev xav tau siab tshaj plaws.Txawm hais tias qee qhov ntsuas ntawm lub hnab muag muag tuaj yeem ua rau lub hnab ntim, qhov zoo kuj tsis sib xws, thiab qee qhov yuav muaj ntau yam khoom zoo.lus nug.Ntawm no, daim ntawv no tshuaj xyuas cov ntsiab lus tseem ceeb hauv cov txheej txheem tsim khoom ntawm BOPA // LDPE cov hnab ntim khoom.
A. Kev xaiv cov khoom siv
1. Kev xaiv BOPA zaj duab xis
①Now phenomenon ntawm nylon zaj duab xis
BOPA zaj duab xis tuaj yeem tsim los ntawm tubular zaj duab xis stretching txoj kev los yog dav hlau biaxial stretching txoj kev.Biaxially oriented nylon films uas tsim los ntawm ntau txoj kev muaj qhov sib txawv hneev nti, uas muaj kev cuam tshuam tseem ceeb ntawm kev luam tawm ntawm cov yeeb yaj kiab thiab qhov flatness ntawm lub hnab ntim khoom (nrog rau cov tsos ntawm lub hnab ntim ua ntej thiab tom qab boiling).
Txoj kev tshwj xeeb txhawm rau txheeb xyuas qhov cuam tshuam ntawm nylon zaj duab xis yog ntsuas qhov thermal shrinkage ntawm kab pheeb ces kaum.Peb kuj tuaj yeem kuaj qhov ntub dej kub shrinkage tus nqi ntawm nylon zaj duab xis raws li kev siv tiag tiag ntawm lub hnab ntim khoom (xws li 100 ℃, 30min).Qhov me me qhov sib txawv ntawm kab pheeb ces kaum cua sov shrinkage tus nqi, qhov zoo dua qhov sib npaug ntawm cov khoom;1.5%, yuav tsis muaj lub kaum sab xis thaum lub hnab ntim khoom.
② Kev lag luam khoom noj ntau yam
BOPA zaj duab xis muab faib ua ob hom: qib luam ntawv thiab qib sib xyaw.Kev luam ntawv qib tuaj yeem siv rau kev luam ntawv thiab cov txheej txheem sib xyaw.Composite qib tsuas yog pom zoo rau cov txheej txheem sib xyaw uas tsis tas yuav luam ntawv.Lub thickness yog feem ntau 12μm, 15μm, 25μm ob specifications.15μm rau cov ntaub ntawv yooj yim ntim cov yeeb yaj kiab, 25μm rau cov khoom siv tshuaj txias txias.Ob tog corona zaj duab xis yuav tsum tau siv thaum nws yog siv rau interlayer lamination thiab rau boiling thiab ua noj ua haus lub hom phiaj.
③ Cov kev cai tseem ceeb ntawm BOPA zaj duab xis
ib.Yog hais tias qhov yuav tsum tau flatness siab, lub synchronously stretched zaj duab xis nrog me me hneev taw yuav tsum tau xaiv.
b.Qhov nro ntawm zaj duab xis yog ≥50mN / m kom ntseeg tau qhov adhesion ceev ntawm tus number case.Tus nqi ua tsis yog qhov loj dua qhov zoo.
c.Xaiv ib zaj duab xis nrog zoo adaptability rau cov txheeb ze av noo los xyuas kom meej overprinting raug.
d.Xaiv cov zaj duab xis ntau yam nrog me me thermal shrinkage tus nqi (ntub kub shrinkage tus nqi).
2. Kev xaiv cov cua sov sealing txheej PE
Qhov sib txawv ntawm lub hnab ntim PE thiab PE zoo tib yam: ① zoo dua kub sealing zog;② zoo thaum tshav kub sealability ntawm inclusions;→ ruaj khov kub sealing zoo;⑤ Cov pob tshab zoo, tsis muaj dej pom tseeb;⑥ Tsis muaj qhov muag ntses, impurities, cov ntsiab lus siv lead ua uas cuam tshuam rau kev siv → Cov npuas npuas, lossis txawm tho qhov PA zaj duab xis → Barrier kev ua haujlwm poob qis, lossis cov roj tshwm sim tshwm sim.Thawj peb tus yam ntxwv zoo yog txiav txim siab los ntawm pellet formulation ntawm txhua txheej ntawm PE zaj duab xis thaum tshuab molding.
3. Xaiv tus cwj mem luam ntawv
Polyurethane tshwj xeeb inks feem ntau yog siv rau nylon zaj duab xis luam ntawv: ① Benzene-dawb thiab ketone-dawb series;② Benzene-dawb thiab ketone-dawb series.
Thaum xaiv cov ntawv luam tawm, ua tib zoo saib rau:
①Qhov kev xaiv ntawm cov qauv xim, xws li F1200 liab, 1500 liab, F1150 liab, F2610 kub liab, F3700 txiv kab ntxwv, F4700 nruab nrab daj thiab lwm yam xim inks ntawm polyurethane number case, nws yog qhia nyob rau hauv phau ntawv qhia tias nws yuav siv tsis tau rau BOPA. / PE Structural boiled zaj duab xis luam ntawv, ib co xim tsis resistant rau boiled, thiab cov khoom xim yog ib qho yooj yim kom nkag mus rau hauv dej thaum boiled.
② Kub thiab nyiaj number case yuav tsum tau siv ceev faj.Rau kub thiab nyiaj number case, lub Hoobkas number case tsis pom zoo kom siv nws rau boiling lub hom phiaj nyob rau hauv cov lus qhia, tab sis ib co boiled ntim hnab nyob rau hauv lub lag luam siv kub thiab nyiaj xim.Qhov kev coj ua dav dav yog mus sab laj rau lub Hoobkas tus cwj mem rau cov qauv tsim ua ntej daim ntawv thov, thiab tseem yuav tsum ceev faj tsis txhob luam tawm hauv cov xim loj.
③ Cov nylon zaj duab xis yuav tsum muaj cov cwj mem zoo adhesion ceev, thiaj li ua kom lub zog kawg tev ntawm tus number case.
4. Kev xaiv cov nplaum
Xaiv ib qho nplaum uas tuaj yeem tiv taus boiling, thiab xyuas kom meej qhov kev sib txuas ntawm kev sib txuas thiab kho tom qab kev sib xyaw.Tsis tas li ntawd, cov kua nplaum uas muaj hnub nyoog yuav tsum tau siv nrog ceev faj (feem ntau yuav tsum zam), vim tias qhov sib piv ntawm tus neeg sawv cev tseem ceeb thiab cov pab pawg kho mob hauv cov kua nplaum tau tsis sib npaug thaum lub sijhawm tso cov kua nplaum uas muaj hnub nyoog, thiab cov kua nplaum. txheej yog nquag qhuav phenomenon.
5. Cov kev cai zoo rau ethyl acetate
Cov dej thiab dej cawv hauv ethyl acetate (tsis yog ethanol nkaus xwb, tab sis kuj yuav tsum tswj cov ntsiab lus ntawm methanol thiab isopropanol) yuav cuam tshuam nrog cov tshuaj tua kab mob hauv cov kua nplaum, thiab cov tshuaj tua kab yuav raug noj, uas ua rau muaj qhov tshwm sim ntawm cov kua nplaum. tsis qhuav tawm.Ib qho ntawm cov laj thawj tseem ceeb rau qhov wrinkling ntawm cov roj hmab txheej ntawm lub hnab.
B. Gravure printing txheej txheem
1. Xaiv cov qauv ntawm tus cwj mem tshwj xeeb
Nws yog tsim raws li tus cwj mem hom teev los ntawm tus txheej txheem.Piv txwv li, qee qhov inks ntawm lwm cov xim tsis haum rau BOPA // PE luam ntawv.
2. Thaum tus number case qub rov qab siv dua, nws yuav tsum tau ntxiv ntau dua 50% tus number case tshiab, thiab tus number case deteriorated yuav tsum tsis txhob siv.
3. Thaum tsim nyog, ib qho kev faib ua feem ntawm kev kho tus neeg sawv cev tuaj yeem muab ntxiv rau tus cwj mem dawb
Muaj ob lub hom phiaj ntawm kev ntxiv ib qho kev faib ua feem ntawm tus neeg sawv cev rau cov xim dawb: ib qho yog txhawm rau txhim kho cov cua sov ntawm tus number case;lwm qhov yog kom offset qhov kev noj ntawm tus neeg sawv cev curing los ntawm cov pab pawg resin nyob rau hauv tus number case thiab tsis txhob ua tiav curing ntawm cov nplaum txheej thaum lub caij ntuj sov.
Ntxiv txoj kev: Dilute nrog hnyav ua ntej, tom qab ntawd ntxiv rau hauv tus cwj mem thaum nplawm maj mam kom txog thaum nws sib npaug.
Txoj kev tsis ncaj ncees: ncaj qha ntxiv tus neeg sawv cev kho rau hauv tus cwj mem, lossis ntxiv rau hauv lub tais tais, uas yuav tsis sib tov sib xyaw, tab sis yuav tsis ua tiav cov txiaj ntsig ntawm kev ntxiv cov tshuaj tua kab mob.
Tsis tas li ntawd, ua tib zoo saib xyuas lub sijhawm: qhov kev ncua sij hawm feem ntau yog 12 teev, thiab tus neeg saib xyuas tus cwj mem thaum hmo ntuj tau tas sij hawm, lossis qee tus neeg saib xyuas yuav tsum tau ntxiv dua.
4. Moisture-pov thawj tswj ntawm nylon membrane
Nylon absorbs ya raws, thiab nws yooj yim rau ruffles, sloping npoo, kab txaij, xim nyuaj, thiab xim tsis raug thaum sau npe.
Thaum luam ntawv, nws yog qhov zoo tshaj plaws los tswj qhov kub thiab av noo ntawm lub rhiav ntau lawm.Thaum cov av noo ntawm lub rhiav ntau lawm tshaj 80%, cov nylon zaj duab xis yog ib qho yooj yim mus nqus noo noo thiab nce, ua rau ib tug series ntawm printing khoom zoo teeb meem.
Tshwj xeeb tshaj yog, xyuam xim rau cov hauv qab no: ① Tsis txhob qhib lub pob ntxov ua ntej siv.② Sim siv nws ib zaug, thiab qhwv cov zaj duab xis ntxiv nrog cov khoom siv nrog cov khoom thaiv zoo.③ Thaum luam ntawv, thawj pab pawg xim tsis nyob ntawm lub phaj rau cov menyuam, thiab nws tau qhuav ua ntej.④ Xyuas kom muaj qhov kub thiab txias (25 ℃ ± 2 ℃) thiab cov av noo (≤80% RH) hauv kev tsim khoom.⑤ Cov ntawv luam tawm nylon yuav tsum tau ntim nrog cov ntaub ntawv pov thawj noo noo.
C. Qhuav txheej txheem
1. Xaiv cov kua nplaum ntau npaum li cas
Tus qauv gluing ntau npaum li cas: 2.8 ~ 3.2gsm, ntau gluing tus nqi tsis muaj lub ntsiab lus ntawm tev lub zog, tab sis nce ziab kom qhuav.Rau cov khoom siv sib xyaw nrog lub peev xwm ziab tsis txaus, nws yuav ua rau muaj qhov tshwm sim ntawm delamination thiab lub hnab tawg tom qab ua noj.
Thaum kuaj pom cov kua nplaum, xyuam xim tshwj xeeb rau kev hloov cov ntsiab lus ntawm cov dej ua ntej thiab tom qab cov nylon zaj duab xis hla lub qhov kom qhuav, uas cuam tshuam rau qhov tseeb ntawm cov kua nplaum kom paub meej!
Thaum peb tsim cov hnab ntim, peb yuav tsum tsis tsuas yog saib cov kua nplaum, tab sis kuj xyuam xim rau lub microscopic uniformity ntawm cov nplaum txheej.Qhov tsis sib xws ntawm cov menyuam mesh yuav cuam tshuam ncaj qha rau microscopic uniformity ntawm cov nplaum txheej.
2. Kev xav tau noo noo ntawm ethyl acetate
Qhov tsis tsim nyog ntawm ethyl acetate (xws li cov dej noo ntau dhau thiab dej cawv) feem ntau ua rau muaj kev sib tsoo zoo ntawm cov ntaub ntawv sib xyaw.
Cov ntsiab lus cawv hauv ethyl acetate feem ntau tsis nyiam cov xim ntawm cov lag luam ntim khoom lag luam uas hloov tau yooj yim.Cov ntaub ntawv xeem ethyl ester (khoom hnyav) ntawm lub lag luam ntim khoom hloov pauv tau pom tias tsuas yog ib qho khoom zoo thiab ob qho khoom lag luam thawj zaug ntawm 14 pawg.Qhov zoo yog qhov tsis zoo, thiab lub Hoobkas pob muag yuav tsum tau them sai sai.
3. Xyuas kom meej tias cov nplaum yog qhuav tag
Peb feem ntau tsuas yog them sai sai rau tus nqi ntawm cov kua nplaum sib xyaw.Qhov tseeb, kev ziab tsis txaus yog feem ntau ncaj qha ua rau kev kho tsis tiav ntawm cov nplaum (tsis muaj cua sov tsis txaus ntawm cov nplaum txheej), delamination thiab wrinkling ntawm lub hnab ntim thaum nws yog boiled.Muaj ib qho me me ntawm dej thiab cawv impurities hauv cov kua nplaum npaj.Cov dryness zoo tuaj yeem ua rau cov dej noo thiab lwm yam impurities nyob rau hauv cov kua nplaum txheej volatilize ntau npaum li sai tau, thiab txo cov kev noj cov tshuaj tua kab mob hauv cov kua nplaum.Txhawm rau kom ntseeg tau tias cov nplaum tau qhuav tag thaum lub sij hawm qhuav compounding, xyuam xim rau cov ntsiab lus hauv qab no:
(1) Kev ua haujlwm kom qhuav ntawm cov cuab yeej siv nws tus kheej, xws li cua nkag thiab tso tawm ntim ntawm cov khoom siv, thiab qhov ntev ntawm qhov cub.
(2) Kev ntsuas kub kom qhuav.
① Qhov chaw ziab kom qhuav hauv thawj cheeb tsam.ethyl ester concentration ntawm qhov ziab nruab nrab hauv thawj cheeb tsam yog qhov siab tshaj plaws, yog li qhov ziab ntawm thawj cheeb tsam tsis tuaj yeem teem siab dhau (feem ntau tsis siab tshaj 65 ° C).Vim tias qhov kub thiab txias dhau lawm, cov kuab tshuaj nyob rau saum npoo ntawm cov nplaum txheej volatilizes sai sai thiab cov tawv nqaij inhibits kev khiav tawm ntawm cov txheej txheem sab hauv cov kuab tshuaj nyob rau hauv qhov ziab ntawm qhov chaw tom kawg.
②Drying kub gradient chaw.Lub qhov cub kub yuav tsum tau teem raws li txoj cai ntawm gradient nce nyob rau hauv gradient, lub hom phiaj yog kom ceev lub diffusion thiab volatilization ntawm cov nplaum txheej hnyav nyob rau hauv lub hardening cheeb tsam thiab qhov chaw tsis muaj ntxhiab tsw, thiab txo qhov hnyav residue nyob rau hauv zaj duab xis.
(3) Kev hloov pauv ntawm qhov nqus thiab tso pa tawm.
① Nyob rau hauv qhov chaw evaporation ntawm cov txheej txheem kom qhuav, lub inlet thiab tso cua ntim li qub yuav tsum tau qhib rau qhov siab tshaj plaws, thiab rov qab cua valve yuav tsum raug kaw.
②Nyob rau hauv qhov chaw qhuav hardening thiab qhov chaw tshem tawm cov ntxhiab tsw, qhov ntim rov qab tuaj yeem tsim nyog, uas tuaj yeem txuag tau qee qhov kev siv zog.
4. Qhov cuam tshuam ntawm ambient kub thiab av noo
Lub caij ntuj sov thiab cov av noo siab nyob rau lub caij ntuj sov yog ib lub sij hawm uas nquag tshwm sim ntawm kev sib tsoo zoo ntawm ob-tiv thaiv polyurethane nplaum txheej txheej txheej txheej txheej txheej txheej.Raws li lub Hoobkas nplaum, 95% ntawm cov lus pom zoo tau txais thaum lub caij ntuj sov tsis cuam tshuam nrog cov nplaum txheej.ntsig txog.Nyob rau hauv ib puag ncig ntawm qhov kub thiab txias, cov ntsiab lus dej hauv huab cua yog siab heev, thiab nws yog ib qho yooj yim rau nkag mus rau hauv lub lauj kaub tais diav los ntawm volatilization ntawm acetic acid kom noj cov tshuaj tua kab mob, kom qhov sib piv ntawm tus neeg sawv cev tseem ceeb ntawm Cov nplaum thiab cov tshuaj tua kab mob tsis sib npaug, ua rau cov nplaum tom qab kev sib xyaw ua ke.Cov txheej crosslinking thiab kho tsis tiav, thiab delamination thiab wrinkling tshwm sim thaum boiled hauv dej.
Cov tuam txhab ntim khoom yooj yim uas tsis muaj cov xwm txheej los tswj qhov kub thiab av noo ntawm lub rhiav yuav tsum tau xyuam xim rau cov ntsiab lus hauv qab no nyob rau lub caij ntuj sov kub thiab av noo siab:
①Los ntawm kev txheeb xyuas qhov ntsuas kub thiab av noo thiab qhov kub siab tshaj ntawm cov tais yas thiab cov thawv hnyav, qhov tshwm sim ntawm "daws point" tuaj yeem zam tau.Thaum "daws taw tes" tshwm sim, nws txhais tau hais tias ntau cov dej noo hauv huab cua nkag mus rau hauv lub tais yas, thiab nws yooj yim heev rau txheej roj hmab kom qhuav.
② Boiled hnab yuav tsum tsis txhob muaj cov av noo siab rau kev sib xyaw ua ke thaum lub sijhawm tsim khoom.
③ Lub thoob ethyl acetate thiab kua nplaum ncig lub thoob siv rau kev sib xyaw yuav tsum tau npog thiab kaw.Yog tias siv lub tais ntim khoom ib nrab kaw, qhov cuam tshuam ntawm ib puag ncig cov av noo tuaj yeem txo qis ntxiv.
5. Maturation txheej txheem yuav tsum
Kev laus kev laus: kub 50 ~ 55 ℃, 48 teev.
Tsis tas li ntawd, ua tib zoo saib xyuas qhov sib xws ntawm kev kho ntawm tag nrho cov yeeb yaj kiab yob: ① seb qhov ntsuas kub ntawm qhov tso tawm yog zoo li qhov ntsuas kub nyob ze ntawm zaj duab xis yob (qhov ntsuas kub ntawm sab saud, qis, sab laug, thiab sab xis ntawm zaj duab xis. yob);② seb huab cua nyob ze ntawm zaj duab xis yob tuaj yeem ua tau zoo convection;③ winding nto Qhov cuam tshuam ntawm qhov kub thiab txias ntawm kev kho: Muaj qee yam txheej txheem ntawm kev hloov hluav taws xob, seb qhov kev kho ntawm cov yeeb yaj kiab puas ua tau raws li qhov yuav tsum tau ua.(Qhov no tej zaum yuav yog ib qho tseem ceeb ntawm qhov tsis zoo.)
D. lub hnab ua txheej txheem
Lub tshav kub sealing lub zog ntawm lub hnab ntim tau zoo dua, thiab qhov tseem ceeb tshaj, qhov zoo ntawm tag nrho cov khoom yuav tsum ruaj khov, xws li: ① tsis muaj qhov tshwm sim tsis zoo hauv zos;② tsis muaj ib tug neeg phem sealing tshwm sim nyob rau hauv tag nrho batch.
Thaum ua cov hnab ntim khoom ntim, ua tib zoo mloog cov ntsiab lus hauv qab no:
① Nyob rau hauv cov xwm txheej ntawm kev ua kom lub sealing zoo li, teem ib tug me ntsis siab dua kub sealing kub kom tsis txhob muaj qhov tshwm sim ntawm unstable tshav kub sealing zoo tshwm sim los ntawm qhov sib txawv ntawm cov thickness ntawm cov zaj duab xis composite.
② Thaum lub sij hawm ib txwm tsim, lub ntug sealing yuav tsum xyuas kom meej peb lub sij hawm thaum tshav kub kub sealing zoo.Thaum lub tshuab raug kaw thiab rov qhib dua, qhov chaw ntawm qhov chaw uas tau kub nias ib zaug lossis ob zaug yuav txias thaum nws rov qhib dua (thawj qhov kub nias tsuas tuaj yeem ua lub luag haujlwm ntawm preheating), thiab Tus naj npawb ntawm cov khoom siv hluav taws xob zoo tsuas yog ob zaug Yog li ntawd, nws tseem yuav tsum tau teeb tsa qhov kub thiab txias ntau dua (lub tshav kub-sealing tuaj yeem ua tau zoo tom qab ob zaug ntawm kev kub-nias), kom tsis txhob muaj tus lej me me ntawm kev sib khi tsis zoo. phenomenon thaum lub tshuab raug kaw thiab ces tig rau.
③Feem ntau ntawm cov hnab ntim khoom yog cov ntim kua, uas yuav tsum muaj kev poob siab ntawm cov hnab ntim khoom.Tsis txhob muab cov ntug ntawm lub tshav kub kaw thaum lub sij hawm ua lub hnab, tshwj xeeb tshaj yog cov ntug ntawm lub tshav kub-sealing riam yuav tsum tsis txhob ntse heev, thiab yuav tsum tau chamfered los yog polished kom tsim nyog..
E. Cov kev cai xeem
1. Tus neeg sawv cev ntawm Kev Ntsuas
①Thaum thawj tus qauv raug lees paub, qhov ntau ntawm ib qho kev kuaj tas mus li yuav tsum npog qhov ntev ntawm tag nrho cov riam sealing, thiaj li kom tsis txhob muaj qhov tshwm sim ntawm ib feem tsis zoo sealing thiab tsis tau kuaj xyuas.
②Sampling yog coj mus kuaj tom qab lub debugging yog ib txwm, kho lub tshav kub sealing kub, siab, thiab tshuab ceev, thiab reconfirm tom qab hloov cov zaj duab xis yob.
2. Kev ua tau zoo ntawm lub tshav kub foob lub zog tshawb nrhiav thiab kev txiav txim siab
① Txoj kev raug yog txiav lub tshav kub-txheej ntug ntawm lub hnab rau hauv ib txoj kab nqaim ntawm 20-30mm thiab rhuav nws nyob rau hauv cov kev taw qhia perpendicular mus rau lub sealing kab.
② Yuav tsum tsis muaj qhov tshwm sim uas qhov dav ntawm ntau tshaj 2 hli tuaj yeem raug torn ntawm sab hauv ntawm ntug sealing.Txwv tsis pub, lub zog yog tsim nyog thaum lub sij hawm kev xeem ntawm lub tshuab, tab sis lub tshav kub sealing txheej tsis yog tag nrho, uas ua rau ib tug loj txo nyob rau hauv lub sealing zog thaum lub sij hawm boiling thiab qhov tshwm sim ntawm lub hnab tawg vim boiling.Thaum lub hnab raug tshem tawm ntawm qhov sib txuas ntawm ob txheej txheej ntawm PE ntawm ntug sealing tom qab boiled hauv dej, nws yog ib qho teeb meem uas lub tshav kub sealing ntug tsis muaj zog.
3. Cov ntsiab lus tseem ceeb ntawm kev sim boiling
(1) Sampling method
① Tom qab lub tshuab kuaj lub hnab ntim ntim tau zoo li qub, tus neeg kuaj xyuas yuav random thiab tsis tu ncua xaiv ob peb lub hnab qauv los ntawm txhua kab hauv lub hnab ntim tshuab kuaj (cov qauv yuav tsum tau npog qhov ntev ntawm rab riam), thiab tom qab ntawd nqa tawm qhov kev sim boiling tom qab muab ntim nrog dej.
② Thaum ua piv txwv ntau tshaj ib lub hnab, siv lub cim cim kom meej lub hnab thiab cov lus qhia sab laug thiab sab xis thiaj li txiav txim siab qhov chaw ntawm rab riam sealing qhov twg cov cua sov sealing tsis ruaj.
③ Thaum cov txheej txheem tsim khoom ib txwm hloov pauv loj, xws li tshuab ceev, hloov kho qhov kub thiab lwm yam, nws yuav tsum rov ua qauv rau kev sim boiling.
④ Tom qab txhua qhov ua haujlwm, rov ua piv txwv yuav tsum tau coj mus kuaj ua haujlwm kub.
⑤ Sib cais thiab cuam tshuam nrog cov khoom tsis tsim nyog pom hauv cov txheej txheem hauv lub sijhawm.
(2) Cov xwm txheej xeem
① Muab 1/3 mus rau 1/2 lub peev xwm ntawm cov dej hauv lub hnab ntim khoom, thiab sim ua kom cua thaum sib khi.Yog tias huab cua ntau dhau yog kaw, nws yooj yim ua rau kev txiav txim tsis raug.Ib lub hau ntxiv thaum lub sij hawm boiling mus rau me ntsis nce siab nyob rau hauv lub hnab.
② Lub sijhawm boiling yog raws li tus neeg siv khoom siv, lossis raws li cov qauv ntsuas cuam tshuam.
(3) Kev xeem kev tsim nyog
① Tsis muaj tag nrho lossis ib nrab wrinkling thiab delamination ntawm lub hnab;lub tev lub zog yog pom los ntawm txhais tes zoo li tom qab boiling.
② Cov cwj mem luam ntawv tsis muaj xim lossis los ntshav;
③ Tsis muaj dej ntws thiab lub hnab tawg;tsis muaj qhov pom tseeb khiav ntug tshwm sim ntawm ntug kev sib khi (qhov khiav ntug dav yog tswj tsis pub dhau 2 hli).
Post lub sij hawm: May-05-2022