Cov cuab yeej tseem ceeb uas txheej xeeb rau qhov kualitè ntawm cov kab PET rau thawv
Nyob zoo noj, PET yog qhov siv nyau tshaj plaws rau kev saum cov du lag luam. Vim PET tuaj yeem sau ua yuav kom sov thiab tau cov khoom uas feem ntau nyob hauv qhov tsis muaj zog, muaj qhuj kub siab thiab yooj yim rau kev rov qhab, PET tuaj yeem siv los ua saum pa, thiab tuaj yeem siv los tau cov chaw tso siab thiab muaj qhuj kub siab los tshuab tawm tawm ntawm lub thawv tsis muaj zog, thiab kuj tuaj yeem tshuab lossis tshuab tawm PET tsis rov qhab. T lub thawv yog cov chaw tso hluv. Cov thawv PET, tshpecially cov thawv tshuab tawm, txhim kho qhov ceev ntawm PET, muaj qhov tshwm sim zoo rau qhov chaw tso, kev ua haujlwm thiab nqi rau kev tuag nrog lwm yam chaw tso hluv. Thaum li, PET yog siv nyau tshaj plaws rau kev tshuab tawm, yooj yim tshaj plaws yog ib xim mililiters mus rau 2 liters thawv leeg, kuj muaj thawv muaj nuj nqi 30 liters. Ntxiv mus rau xyoo 1980, vim nws qhov nyuaj, yooj yim rau kev tsim, nqi tsawg thiab yooj yim rau kev tsim tshaj tshob, nws tau muaj qhov ceev tshaj plaws. Nyob rau 20 xyoo, nws tau ib ncig tshaj tshob los yog thawj tus neeg siv nyau tshaj plaws rau kev saum du lag luam hauv ntiaj teb. Nws tsis yog tsuas siv nyau tshaj plaws rau kev saum du lag luam carbonated, du dej tshuab, kev lag luam, kev lag luam, tshuaj lag luam, fructose suav thiab lwm yam khoom, tab sis kuj tuaj yeem siv rau kev saum du lag luam tshuaj tshuaj thiab du lag luam tshuaj tom qab xaiv tshuab tawm. Cov thawv tshuaj tshuaj PET uas tau siv technology tseem ceeb tshaj plaws kuj tau pib mus rau market, thiab cov thawv PET uas tsis muaj bacteria kuj tau ceev tshaj plaws. Tuaj yeem hais tias kev pab cuam kho mob tau txhim kho qhov siv ntawm cov thawv PET, tsis yog tsuas yog mus cuam tshuam rau qhov chaw tso dej thiab du lag luam carbonated, tab sis kuj mus cuam tshuam rau tshuaj tshuaj thiab lwm yam chaw tso hluv thiab aluminum can.
Qhov kev tsim khoom ntawm PET bottle-grade chip yog tshuam nyob rau ob qhov chaw. Qhov thib ob yog kev tsim khoom ntawm basic chip, yog li cas yog kev tsim khoom polyester. Kev tsim khoom ntawm bottle-grade basic slices muaj feem ntau zoo ib yam li kev tsim khoom conventional slices. Thiaj li, kom pom zoo nrog qee yam caij noj mov ntawm bottle-grade slices, tus IPA thiab qee yam khoom siv tau tshiab (additives) tau muab them ntxiv. Qhov thib ob yog kev ntxig zog hluav taws xob ntawm foundation slices.
1. lub meej ntawm raw material slicing
Ib txoj kab kev sib thooj thiab ib txoj kab kev sib thooj yog qhov tseem ceeb. Thaum muaj kev npap siab rau qhov chaw tshwm sim, cov duab leej leej ntawm cov duab yooj yim tsum tau hlawg tawm sai. Cov khoom lag luam uas tsim tawm los ntawm kev sib thooj hluav taws xob tuaj yeem sau nrog los ntawm ob qho kev ua: kev sib thooj ntawm cov khoom lag luam leej leej los ntawm hauv rau sab nraud ntawm lub chip thiab kev sib thooj los ntawm sab nraud ntawm lub chip. Txhua qhov, nyob rau hauv kev tsim kho SSP, qhov siab ntawm cov duab leej leej hauv lub chip yog qis dua qhov siab ntawm sab nrauv ntawm lub chip nyob rau hauv su temperatures thiab qhov siab. Yog li, kom txwv kom tau cov khoom lag luam leej leej, cov kev lag luam xyaum tias lub chip. Qhov siab nyob rau hauv lub reactor yog ntev dua. Vim tias qhov siab ntawm cov khoom lag luam leej leej hauv cov duab me me yog luv dua li hauv cov duab loj, nws yog qhov yooj yim los txwv, thiab cov duab me me, qhov nruab nrab ntawm cov duab rov qab, qhov siab ntawm kev sib txuas rov qab, thiab qhov siab ntawm kev sib thooj rov qab. Yog li, nyob rau hauv ib qho chaw, qhov siab ntawm kev sib thooj hluav taws xob ntawm PET yog rov qab rau qhov ntau ntawm cov duab ntawm cov khoom siv. Tab sis, yog tias cov duab yog me heev, nws yog qhov yooj yim los txuas, uas yuav cuam tshuam rau qhov siab ntawm kev sib thooj. Nyob rau hauv ntu, daim ntawv ntawm cov duab kuj yuav cuam tshuam rau qhov siab ntawm kev sib thooj. Daim ntawv tsis zoo thiab yooj yim los txuas. Yog li, muaj ib qho kev txiav txim siab siab rau kev txiav qhov chaw pheej, thiab tsis muaj qhov chaw pheej yuav tsum tau mus rau hauv kev sib thooj hluav taws xob.
2. tus leeg ntawm lub hnub ntawv raw material slices
Tus nqi xim ntawm cov kab ntsug raw xa khoom yog qhov tsim tau tus nqi xim ntawm cov khoom xa. Muaj ntau yam cuab yeej uas txheej txheem rau tus nqi xim ntawm cov xa hauv qab. Xim yog tus indicator pom meej tshaj plaws rau qhov kub siab ntawm cov xa sib laum. Kev ntu los ntawm kev sib piv thiab kev ntu kom muaj caij, thiab International Lighting Commission (ILC) standards ntu, feem ntau ntu los ntawm cov ntu nqi xim Hunt (L, a, b), L txhais tau tias qhov dawb, qhov sov; A yog tus lej xim nkauj / xim fawv; B yog tus lej xim khoob. Muaj ntau yam cuab yeej uas txheej txheem rau xim ntawm cov xa hauv qab, uas feem ntau los ntawm qhov kub siab ntawm cov khoom siv, hom thiab ntau ntawm cov khoom siv ntxiv, kev lag luam tsim khoom, kev coj qhov kev lag luam tsim khoom, thiab qhov kub siab ntawm cov khoom. Nyug thaum no, qhov kev tswj hwm siv los ntawm qhov kev lag luam yog los thay qhov ntau ntawm cov khoom siv xim fawv thiab xim dawb nyob rau hauv qhov chaw uas qhov kev lag luam tsim khoom yog zoo, thiab qhov kub siab ntawm cov khoom siv yog zoo. Cov cuab yeej txheej txheem rau tus nqi xim ntawm cov khoom xa zoo ib dua, tab sis cov xa siv rau hauv chai yog tseem ceeb heev rau tus nqi xim ntawm cov khoom, yog li qhov kev lag luam tsim khoom yuav tsum raug hloov tam sim mus kom dhau los rau kev tshaj tawm ntawm cov neeg siv khoom.
3. Pawg IPA thiab DEG
Pawg ntawm IPA thiab DEG hauv daim phiaj uas tsim nyog twj tso rau hauv kev tsim kho daim phiaj pheej, thiab pawg ntawm IPA thiab DEG tsis pauv txwv ntau hauv kev tsim kho daim phiaj tawm.
Qhov ntau ntawm IPA yog qhov tseem ceeb heev rau kev sib txig siab ntawm PET chip. Qhov txhawb ntawm kev ntxig IPA yog kom txo qhov xwm yeem sib piv ntawm kev ceev npaj PET macromolecule kom txo qhov crystallinity ntawm PET chip. Tab sis qhov chaw so thiab chaw lag ntawm PET twb hlo li los ntawm kev ntxig IPA, uas tsim qhov kev nyiam kub thiab kev ceev npaj meej ntawm cov chaw tso dej nyuaj dua. Yog li, qhov ntau ntawm IPA yuav tsum raug hloov kho raws li kev xyaum tshwj xeej thiab tswj xyuas ntau. Nyob no, lub chaw tsim khoom tsim ob hom PET slice rau cov neeg siv khoom, ib hom yog PET slice rau cov dej tso dej carbonated, ib hom yog PET slice rau cov dej sov ntxoov ntxoo, hom thib ob no xav tau kev nyiam kub zoo, yog li nyob aside ntawm kev hloov kho nyob hauv kev tsim phial, xws li sau cov kev txhim kho kub thiab hloov qhov khib nyiab. Tom qab ntawv, qhov ntau ntawm IPA (1.5% hlo li los ntawm qhov hluv) twb hlo li nyob rau hauv cov khoom siv rau kev pab cuam qhov crystallinity ntawm PET kom dhau qhov tshwj xeej ntawm kev nyiam kub ntawm cov chaw tso dej. Nyem dua, qhov ntau ntawm IPA kuj muaj kev pab lub zog rau kev sib sau hauv qhov chaw tsis muaj zog, yog tias qhov ntau ntawm IPA tsis raug, piv txwv li, thaum qhov ntau yog ntau heev, nws yuav tsim qhov tsis tiav ntawm kev sib sau hauv qhov chaw thaw thiab qhov chaw sib sau, ua rau cov chip nyob hauv kev sib sau hauv qhov chaw tso dej.
Zaj lus ntawm diethylene glycol feem ntau txheeb xyuas los ntawm kev tsim kho, tab sis kuj tuaj yeem hloov tau los ntawm kev hloov qhov sib npaug ntawm kev hloov me me (xws li hloov qhov sib npaug ntawm EG rau PTA). Nyob rau hnub no, qhov ntau ntawm diethylene glycol hauv cov kab ntiag tug yog nyob rau hauv 1.1% + 0.2% (pob meej nyiaj). Nyob rau hauv qhov sib piv no, qhov ntau dua ntawm diethylene glycol zoo rau kev pab cuam tshuaj tso zis ntawm PET, vim qhov kev ua siab ncaj ncees ntawm ether bond hauv diethylene glycol, uas tuaj yeem pab tso zis qhov teeb pom ntawm PET, tab sis qhov ntau no tsis tuaj yeem ntau heev, vim qhov muaj ntawm ether bond tsis zoo pab cuam qhov ceev siab ntawm cov moleculer PET, tsis cuam tshuaj tso zis ntawm PET, thiab yooj yooj tshaib tso zis viscosity ntawm cov kab ntiag. Kev ua haujlwm ntawm kev sau npe. Yog tias qhov ntau yog ntau heev, nws kuj yuav tsis cuam tshuaj siv tshuaj tso zis ntawm cov kab ntiag.
4. Qhov chaw ntawm carboxyl
Nyob rau hauv qhov kev txwv thiab lwm yam kev txwv, qhov ntau ntawm carboxyl kauj ruam muaj peev xwm txeem ceeb los cuam tshuam rau kev nce tswv yim. Yog li ntawv tuaj yeem pom los ntawm kev teeb tseg ntawm kev sib thaj tsis sib tshooj (SSP) uas muaj ob hom kev sib thaj: ib tug yog transesterification, tus kheej yog esterification, thiab qhov ntau ntawm carboxyl kauj ruam yog qhov tseem ceeb rau kev sib thaj ntawm PET thiab tswv yim. Rau hauv qhov chaw PET, qhov nce ntawm H+ concentration kuj tseem ceeb rau kev tshuaj siv tshuaj tiv thaiv, tab sis qhov nce ntawm carboxyl kauj ruam kuj cuam tshuam rau kev siv khoom tom ntej, yog li cov carboxyl kauj ruam ntawm khoom pheej hmub yuav tsum meej nyob rau hauv qhov kev txwv, feem ntau yuav tsum nyob rau 30. ~40mol\t, thiab cov carboxyl kauj ruam ntawm khoom siv chai [30mol\t.
5. Cov nqi txiaj ntsim
Qhov yooj yim thiab tus nqi ntawm qeeb yam khoom siv hluas nyob rau hauv daim phiaj raw material tuaj yeem muaj kev xav txog rau qhov tseeb ntawm daim phiaj tiav. Kev tsim kho daim phiaj rau hauv chai muaj feem tshuam rau kev siv thawj tso caij ntxaws polyphosphoric acid. Qhov cheeb tsam ntawm polyphosphoric acid yog mus kuaj xyuas qhov chaw thaum pib thiab thaum kaw ntawm PET molecular chain nrog phosphate group thiab tso zog rau qhov tseeb ntawm PET chain. Tab sis, qhov phosphate group kuj tuaj yeem hloov los ua thawj tso caij rau PET crystal. Txhawm tias, nws tuaj yeem muaj kev xav txog rau kev tsim kho daim phiaj rau chai. Nyob hauv qhov kev tsim kho chai, oligomers, metal oxides (xws li antimony trioxide), phosphates, thiab lwm yam no yog thawj tso caij rau PET crystallization, tab sis lwm yam khoom molecular tsuas yog polyethylene glycol tsis muaj thawj tso caij. Tab sis, nws yog thawj tso caij rau crystallization. Yog tias qhov ntau ntawm cov khoom no tshaj qhov ntau ntawm PET, qhov teeb meem ntawm PET yuav raug tso siab dua (xws li, qhov teeb meem ntawm kev tso siab yuav hloov mus rau saum toj), uas yuav xav txog rau qhov tseeb ntawm chai, tsim kev ncua duab nyob rau saum toj lossis sab npaug ntawm chai, thiab tuaj yeem xav txog rau qhov tseeb ntawm ib leeg chai. Vim li no, nyob hauv qhov kev tso siab tias qhov tseeb ntawm daim phiaj thiab qhov teeb meem (khoom siv), cov khoom siv hluas, suav nrog thawj tso caij, yuav tsum tsuas yog tsawg dua tsawg dua.
Txeej txwm ntawm kev tsim kho tawm thiab kev siv neeg kho tawm rau cov khoom siv
Yam ntau, tus nqi saum npoo taws tes suav nrog yog 145~150°C (cov nqi no lawm los ntawm lub teb chaws xa khoom). Yog tias kub tsis zoo li cas, yuav nyuaj los tshem tiv neeg hauv daim ntaub hauv qab chaw, uas yuav ua rau kev sib txawv ntawm daim ntaub hauv qab chaw nyuaj siab, thiab tsis muaj peev xwm rau kev tsim kho. Tab sis, tus nqi kub ntawm kev sib txawv yuav tsum tsis txhob kub heev, vim tias thaum kub rov qab, kev muab zog thiab dej hauv av hauv qab chaw thiab hauv qab chaw yuav tsum tau sib txawv kom cuam tshwv rau tus nqi xeeb. Tus nqi kub ntawm qhov sib txawv yog 170~175°C (cov nqi no lawm los ntawm lub teb chaws xa khoom). Yog tias kub siab dua 175°C, thaum lub sijhawm ntawm daim ntaub hauv qab chaw thiab hauv qab chaw rov qab nce, tus nqi xeeb nce ntau dua, tab sis tus nqi sib txawv tsis nce. Nyuaj rau nrhiav ib qho b-value zoo los ntawm kev sov dav dav, vim tias kub yog qe, tsis muaj kev sib txawv ntawm daim ntaub hauv qab chaw yuav ua rau daim ntaub hauv qab chaw hauv qab chaw thiab hauv qab chaw, thiab dej hauv qab chaw yuav nyuaj. Xaiv, qhov no yuav tshwm sim rau kev nce thickness ntawm daim ntaub hauv qab chaw thiab tshwm sim rau tus nqi hauv qab chaw. Tsis tas li, tshwj tsis yog tias qhov surface ntawm daim ntaub hauv qab chaw sib txawv zoo.
7. Txeej nghees ntawm kev tsim kho tawm thiab kev ua haujlwm ntawm preheater thiab reactor nyob rau hauv qhov kev ua haujlwm ntawm cov khoom
Ob qhov no muaj qhov loj me ntuag sib txawv ntawm kev nyiag siab ntawm cov xim. Muaj ob qhov cuab yeej uas txhawb qhov kev sib raug zoo thermodynamics thiab kinetics ntawm qhov kev sib tham solid phase polycondensation: qhov txhem kub thiab qhov ntau npaum li cas ntawm cov khoom lag luam leeg molecular leeg uas tshuav mus saum npoo ntawm qhov chaw. Qhov thawj cuab yeej nyob ntawm qhov kub ntawm kev coob yuav los ntawm nitrogen.
Qhov kev ntxig ntawm teb chaws hauv plua pluaj muaj feem ntau thiab tsis zoo. Feem ntau yog tias khiav hnyav teb chaws tuaj yeem pheej siab ntau dua, thiab tus nqi siv tau tuaj yeem pheej siab ntau dua thaum qhov viscosity nyuaj siab tshwm sim. Tom qab ntawv, tus nqi siv tuaj yeem pheej siab ntau dua nyob rau qee qhov kev xwm txheej. Ntau dua. Tab sis, qhov ntxig hnyav tseem tshwm sim ntau dua, uas tseem tshwm sim rau qhov kub ntawm qhov khoom lag luam. Yog li, nyob rau hauv qhov kev lag luam nyob ze, yuav tsum nrhiav qhov teb chaws xws li, suav nrog ob qhov. Nyob rau hauv qhov no, qhov teb chaws ntawm qhov reactor yog xam los ntawm qhov teb chaws outlet ntawm qhov preheater. Qhov teb chaws ntawm qhov reactor tuaj yeem sau los ntawm kev hloov qhov teb chaws outlet ntawm qhov preheater thiab qhov flow ntawm nitrogen nyob rau saum npoo ntawm qhov preheater. Qhov teb chaws inlet ntawm qhov reactor yog ncav ncav mus saum npoo, thiab qhov kev sib raug zoo ntawm qhov system yog ncav ncav. Thaum twg muaj kev hloov, qhov sijhawm kom rov kho yog ib xyuas dua tshaj qhov sijhawm nyob ntawm qhov reactor, thiab qhov viscosity ntawm qhov khoom lag luam pom tsha yog hloov. Nws xav tau sijhawm, lossis qhov kev sib raug zoo yuav sib txawv, tshwm sim rau qhov thickness tsis zoo ntawm qhov slice, uas yuav tshwm sim rau qhov kev siv khoom tom qab.
Qhov kev cuam tshuam ob yog nyob ntawm qhov muaj siab ntawm nitrogen hauv sijhawm ntawm kev sib tham thiab qhov chaw nruj ntawm lub hnub. Ntawm no, nitrogen yog ib txoj hlua rau kev sib ntxiv (txhawj xeeb nyob rau hauv ib qhov kheej tshuaj) thiab lwm qhov hluav taws xob uas ncav cuag cov khoom lag luam leeg. Txog li cas los xwb, cov khoom lag luam leeg uas tsim los ntawm kev sib ntxiv hauv qab duab solid phase tau ncav cuag tawm hauv ob qho kev sib txig, uas qhov kev sib txig ntawm cov leeg molecules tawm ntawm qhov chaw yog nyob ntawm nitrogen thiab saich tshuaj. Nitrogen thiab kev muaj hnub ntawm no yog kev sib txig rov qab, uas tso cai rau kev sib ntxiv zoo dua thiab ncav cuag cov khoom lag luam leeg. Qhov kheej tshuaj ntawm BUHLER siv ib qhov chaw tsis nyob rau sab nraud, uas tau sib ntxiv los ntawm nitrogen sab nraud thiab kev sib ntxiv nitrogen sab laj kom sib ntxiv zoo dua thiab tsis muaj qhov chaw tsis tuaj. Nyob rau hauv reactor, vim tias lub hnub tau raug ntxuav rau sab nraud, qhov saich tshuaj sab nraud tau raug sau ua saich tshuaj tsawg dua ntawm 190 degrees, ua rau lub hnub tsis tas yooj yim ntxuav. Txog li cas los xwb, siv los ntawm kev sib ntxiv, qhov muaj siab ntawm nitrogen yog qhov saich tshuaj thiab qhov loj ntawm kev tsim kho (nyob rau hauv, qhov xoom ntawm hluav taws xob thiab khoom). Thaum saich tshuaj thiab qhov loj ntawm kev tsim kho yog tseem ceeb, qhov muaj siab ntawm nitrogen muaj qhov tseem ceeb, nyob rau thaum qhov tseem ceeb tau muaj, qhov muaj siab tsis tshua cuam tshuam rau kev sib tham vim tias qhov chaw hluav taws xob thiab khoom tau muaj qhov tseem ceeb, tab sis thaum saich tshuaj nce, qhov tseem ceeb tau raug puas tsuaj, thiab qhov ntau ntawm cov leeg molecule nyob rau qhov chaw hluav taws xob thiab khoom tuaj yeem nce mus txog thaum muaj qhov tseem ceeb tshiab.
Lub ntsiab lus twg kawg uas txhaj tshav rau tus lej ntawm kev sib hauv ntawm SSP yog zog ntim - zog catalyst. Yog li, tus lej ntawm catalyst nyob rau hauv qhov chaw pib, lub ntsiab lus ntawm catalyst nyob rau hauv qhov A yog li cas li 2/3 ntawm qhov B. Nyob rau hauv qhov kev txhawb siab uas txhaj tshav rau kev sib hauv ntawm catalyst, pom tias tsis yog ib qho ch thôi, tab sis kuj muaj teeb temperature uas tseem tshaj tshav dua.
8. Qhov kev txhawb siab ntawm qhov chaw sau hauv thiab cov khoom siv
(1) Lub ntsiab lus ntawm Oxygen
Muab ib qhov leej leeg ntawm khwv tshuaj ntxuav rau hauv qhov kev pab cuam tshuaj nitrogen kom tshem tawm cov dundob kub uas tsim nyog los ntawm qhov kev pab cuam tshuaj nitrogen. Saib xyuas txhais tau tias cov dundob kub uas muaj pej xeem hauv kev sib tham yog ethylene glycol, thiab muaj ib co acetaldehyde, oligomer, thiab lwm yam uas tsim tawm los ntawm kev sib tham sab laug, uas yuav raug hu kom ua kom sov los ntawm oxygen rau carbon dioxide thiab dej hauv qhov chaw hu khwv tshuaj Pt/Pd hauv qhov chaw hu khwv tshuaj. Tab sis, cov dundob kub hauv no yuav tsum meej meej khiav ceev vim tias cov dundob kub tuaj yeem tsim kev khaum kub hauv qhov kev tsim kho, uas tsim kev phom sij rau tus lej xim ntawm khwv tshuaj, kev hloov siab hloov, thiab kev nce tawm ntawm cov carboxyl group. Cov dundob kub hauv cov khwv tshuaj nitrogen los ntawm qhov kev pab cuam tshuaj nitrogen hauv chaw tsim khwv tshuaj yuav tsum nyob rau hauv 10 ppm. Nyob tam sim no, raws li cov yam ntxwv ntawm qhov kev pab cuam tshuaj nitrogen, nyob pom zoo catalytic oxidation, ib qho kev tswj hwm kom tshem tawm cov dundob kub kub hauv nitrogen kuj tuaj yeem sau nrog EG sib tshooj, uas tuaj yeem tshem tawm cov dundob kub hauv nitrogen, tab sis rau cov dundob kub kub uas muaj boiling tsawg zoo li acetaldehyde. Qhov kev tshem tawm tsis zoo
(2) Kev sib txuas ntawm nitrogen
Kev sib txuas ntawm nitrogen muaj kev tshwm sim ntsib rau kev nyiag hluas thiab qhov yooj yim ntawm cov xim. Thaum kawg, cov hydrocarbon molecular leeg ntawm nitrogen tuaj yeem pab tso cai rau kev sib thaj sib tov mus rau sab rooj kawg, uas tsis pab rau kev nyiag hluas ntawm cov xim. Tom qab ntawd, nws kuj tshwm sim rau kev tshem tawm aldehyde hauv cov xim, yog li nws tshwm sim rau qhov ntau ntawm aldehyde hauv cov xim, tab sis kev sib thaj sib tov polymer yog qhov tseem ceeb heev, kev surov txog kev tshwm sim ntawm cov duab leeg leeg hauv nitrogen rau qhov ntau ntawm aldehyde feem ntau tsis tau surov.
(3) Qhov chaw tshwm sim dew ntawm qhov kev lag luam nitrogen
Nyob hauv tib siab kawg, phaum dej tuaj yeem tsim kev hydrolyze rau polyester macromolecules thiab muaj txoj caij rau qhov yooj yim ntawm qhov khoom. Vim li no, nyob rau hauv kev tsim kho polycondensation hauv dundeeb, yuav tsum sau nraim rau lub dew point ntawm lub nitrogen system, yog li, yuav tsum sau nraim rau cov phaum dej hauv lub nitrogen system. Rau cov khoom siv BUHLER, lub nitrogen dew point yuav tsum nyob saum -30 degrees thiab cov SINCO yuav tsum nyob saum -40 degrees.
Mus Yog Hais Lwm
Thiab twb PET bottle grade chips siv ua khoom siv rau kev saum npawb, cov ntsiab lus tseem ceeb ntawm qhov yooj yim muaj cov theem no: qhov kev pom zoo, kev siv tshwj xeeb, kev sau nraim, tsis muaj qhov ntxhiab lossis tsis muaj neeg laug, thiab ntau yam cuam tshuam mus rau qhov yooj yim ntawm cov chips tseem txaus siab kom nyuaj. Cov ntsiab tseem ceeb tseem ceeb tseem ceeb yog ib co ntawm cov analysis saum toj no. theem. Sib txuas nrog cov neeg siv tswv yim, cov ntsiab lus pheej xeem, kev tshuaj xyuas thiab kev tshuaj xyuas yuav tsum raug hloov pauv los kho cov ntsiab lus saum toj no kom dhau rau kev tshawb nrhiav tshwj xeeb. Thiab tseem prepare rau kev tshwm sim ntawm SSP production.
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