Dab tsi yog qhov tseeb hauv daim ntawv PVC

Ob daim ntawv tuaj yeem saib zoo ib yam hauv daim duab thiab coj zoo li cov khoom sib txawv hauv qab lub saw. Qhov txawv yog daim ntawv qhia.

Txhua daim ntawv PVC ntawm kev lag luam duab zoo ib yam. Ob daim ntawv tuaj yeem sib faib qhov ntom, tuab thiab xim thiab tseem coj zoo li cov khoom sib txawv ntawm lub rooj ntev zaum. Qhov txawv yog daim ntawv qhia, thiab daim ntawv qhia yog sau nyob rau hauv ib chav tsev feem ntau buyers yeej tsis pom.

Cov ntaub ntawv teev cov ntom, thickness thiab ib tug puv tes ntawm mechanical nqi. Nws tsis sau tias daim ntawv yog ua los ntawm, uas yog ib feem uas txiav txim siab seb nws muaj hnub nyoog li cas. Dab tsi hauv qab no yog qhov muaj pes tsawg leeg ntawm aPVC ua npuas ncauj board, txhua yam ua dab tsi, thiab qhov twg ntawm lawv koj tuaj yeem nug ua ntej tso qhov kev txiav txim.

Tsis muaj qhov no yog zais cia. Nws tsuas yog tsis tau luam tawm.

PVC daim ntawv formulation yog sau nyob rau hauv phr, luv luv rau ib puas resin. Txhua yam yog ntsuas tawm tsam ib puas units ntawm PVC cob, yog li tsib phr calcium carbonate txhais tau tias tsib kilograms ntawm muab tub lim rau txhua puas kilograms ntawm resin. Nws tsis yog tsib feem pua ​​​​ntawm cov ntawv tiav, thiab qhov sib txawv tseem ceeb thaum koj pib sib piv ob tus neeg muag khoom.

Qhov ntau yog dav rau lub hom phiaj. Ib daim ntawv nyob hauv qab ntawm qhov muab tub lim thiab ib daim ntawv nyob rau saum toj yog tib yam khoom ntawm ib daim ntawv qhia tshwj xeeb thiab cov khoom sib txawv hauv kev pabcuam. Qhov dav dua qhov ntau tus neeg xa khoom tso cai rau lawv tus kheej, ntau chav muaj rau kev sib xyaw kom txav ntawm kev txiav txim.

Ib tug txiav ntug qhia cov qauv ntawm tes tab sis tsis yog formulation. Ob daim ntawv nrog cov hlwb zoo ib yam tuaj yeem nqa cov khoom ntim sib txawv heev.

PVC cob yog muab qhab nia los ntawm K- tus nqi, uas yog muab los ntawm qhov nruab nrab saw ntev ntawm cov polymer. K- tus nqi siab dua txhais tau tias cov molecules ntev dua. Cov molecules ntev dua feem ntau txhais tau tias cov khoom siv kho tshuab zoo dua thiab zoo dua rau kev ntxhov siab tawg.

Qhov kev xav ntawd rhuav tshem lub sijhawm koj sim ua npuas nws.

Ntev chains nce lub yaj viscosity, thiab ib tug viscous yaj resists lub expansion tus neeg sawv cev foaming yog sim tsim. Nias lub K- tus nqi nce thiab cov roj yuav tsum ua haujlwm tawm tsam cov khoom siv tawv. Qhov tshwm sim tsis yog ib daim ntawv denser. Nws yog ib daim ntawv uas ntxhib, tsis sib xws, lossis nrog cov hlwb uas tau tawg nyob rau hauv ib cheeb tsam thiab tshaj - nthuav mus rau lwm qhov. Cov tawv nqaij saum npoo ua tsis sib npaug, thiab ib daim ntawv nrog cov tawv nqaij tsis sib xws warps thaum nws sov.

Yog li cov qib resin raug xaiv kom haum rau cov txheej txheem, tsis yog kom yeej ib qho kev sib piv. Kev ncua - qib resin yog tus qauv nkag rau daim ntawv extrusion. Emulsion-qib resin coj txawv dua thiab koom nrog kev muab tshuaj txhuam thiab plastisol ua haujlwm es tsis yog board.

Qhov no yog thawj qhov chaw uas tus neeg yuav khoom tuaj yeem kawm qee yam muaj txiaj ntsig. Nug seb qib resin twg tus neeg muag khoom khiav. Tus neeg xa khoom uas teb nrog K- tus nqi lossis qib polymerisation tab tom khiav cov txheej txheem tswj. Tus neeg muag khoom uas teb nrog lo lus "virgin" tsis tau hais rau koj.

PVC tsis yog cov khoom ruaj khov ntawm kev ua haujlwm kub. Los ntawm kwv yees li 180 degrees Celsius nws pib tso hydrogen chloride, thiab cov tshuaj tiv thaiv pub nws tus kheej. Lub yaj sab laug tsis muaj kev tiv thaiv mus los ntawm dawb los ntawm daj mus rau xim av thiab thaum kawg mus rau dub, thiab kev puas tsuaj tsis thim rov qab.

Stabilizers cuam tshuam cov saw hlau. Peb tsev neeg ua haujlwm ua lag luam, thiab lawv tsis hloov pauv.

Qhov kev coj ua lag luam yog ncaj qha. Stabilizer xaiv yog kev ua lag luam- nkag mus rau kev txiav txim siab ua ntej nws yog ib qho txuj ci. Ob daim ntawv tuaj yeem zoo ib yam hauv txhua qhov cuab yeej ntsuas tau thiab ib qho ntawm lawv tsis tuaj yeem muag hauv ib nrab ntawm lub ntiaj teb.

Qhov no txhais tau hais tias cov lus nug tsim nyog nug ntxov, thiab cov lus teb tsim nyog tau txais kev sau ntawv. Ib tus neeg muag khoom uas tsis tuaj yeem hais lub npe stabilizer yog yuav khoom los ntawm lwm tus yam tsis tau nug, lossis tsis xav hais. Ob leeg yog cov ntaub ntawv tseem ceeb.

Xim tuav los ntawm kev ua tiav yog qhov pom cov zis ntawm lub stabilizer system. Ib daim ntawv uas tawm ntawm kab dawb tau ruaj khov zoo rau txoj kab ntawd.

Calcium carbonate yog cov khoom pheej yig tshaj plaws hauv kev sib xyaw thiab qhov loj tshaj plaws ib leeg ntawm tus nqi hais. Nws tuaj txog hauv av limestone, feem ntau yog saum npoo- kho nrog stearic acid kom nws tawg sib npaug es tsis yog clumping.

Ntxiv muab tub lim tsa qhov ntom ntom, nruj thiab kub ua haujlwm. Nws txo qis kev cuam tshuam lub zog, nto zoo thiab luam adhesion. Txhua kilogram ntawm muab tub lim tshem tawm ib kilogram ntawm resin, thiab resin yog qhov feem ntau ntawm cov nqi zaum. Qhov ntawd yog tag nrho cov mechanism. Tsis muaj qhov zais cia dhau ntawm nws.

Qhov teeb meem yog tias kev lag luam nyeem tsis raug.

Density and filler loading are related but not the same thing. Qhov ntom ntom yog cov khoom tiav. Filler loading yog ib txoj kev xaiv. Ib daim ntawv ntawm ib qho kev ceev tuaj yeem ncav cuag nrog ntau cov muab tub lim thiab ib qho me me ntawm foaming, los yog tsawg dua muab tub lim thiab roj ntau dua. Thawj yog pheej yig dua los ua thiab phem dua hauv kev pabcuam.

Qhov no yog vim li caskuaj qhov ntom ntawm nws tus kheejsettles tsawg tshaj li buyers xav. Qhov ceev yog tus lej. Nws tsis yog qib zoo.

Ua npuas ncauj board tsis yog ib qho khoom nrog qhov. Cov qauv yog tsim thaum lub sij hawm extrusion, thiab cov cuab yeej tsim nws yog ib qho tshuaj uas decomposes ntawm cue.

Lub workhorse yog azodicarbonamide. Nws tawg hauv lub thoob ntawm qhov kub thiab txias thiab tso tawm nitrogen, carbon monoxide thiab carbon dioxide. Cov roj dissolves rau hauv lub yaj nyob rau hauv siab. Thaum cov yaj tawm ntawm qhov tuag thiab lub siab poob, cov roj tawm los ntawm kev daws thiab cov khoom nthuav dav.

Azodicarbonamide decomposition yog exothermic. Nws tso cua sov thaum nws ua haujlwm, thiab nyob rau hauv ib qho tuab tuab uas cov cua sov tuaj yeem thawb cov tshuaj tiv thaiv ntxiv tshaj qhov xav tau. Sodium bicarbonate ua qhov sib txawv, nqus cua sov thaum nws decomposes. Feem ntau cov formulations muab ob qho tib si, siv cov tshuaj tiv thaiv endothermic los tuav lub exothermic ib qho kev kuaj xyuas. Qhov sib xyaw ua ke yog ib qho ntawm qhov tsis tshua pom kev sib txawv ntawm tus neeg muag khoom tswj.

Cell loj yog teem los ntawm ob yam: nucleation thiab txias npaum li cas. Fine talc yog ntxiv los ua tus neeg sawv cev nucleating kom npuas tsim ntawm ntau lub ntsiab lus ntau dua li ob peb. Txias tus nqi ces txiav txim siab deb npaum li cas txhua npuas loj hlob. Txias ntawm qhov chaw ceev ceev thiab cov hlwb nyob ze ntawm daim tawv nqaij nyob me me thiab ntom, ua rau cov txheej txheem tawv tawv dhau ntawm cov tub ntxhais sib zog. Txias maj mam thiab cov hlwb txuas ntxiv mus kom txog thaum qhov ntom ntom ntom.

Ib qho kev sib txawv ntawd yog dab tsi cais ob pawg thawj coj hauv khw. CovQhov sib txawv ntawm Celuka thiab dawb - ua npuas ncauj boardstsis yog chemistry. Nws yog qhov tshwm sim rau lub yaj thaum nws txias.

Kev sib xyaw ua ke thoob plaws ib pawg yog qhov ua kom txias thiab sib xyaw ua ke. Kev hloov pauv hauv ib lub pallet feem ntau txhais tau hais tias kab tsis tuav qhov kub thiab txias.

Plaub pawg ntawm cov khoom siv ntxiv zaum ntawm cov resin thiab cov ntawv tiav, thiab tsis muaj leej twg tau teev nyob qhov twg tus neeg yuav khoom pom.

Lubricantstxiav txim siab seb cov yaj tawm huv si los ntawm qhov tuag thiab cov calender yob. Cov roj nplua nyeem tsawg dhau thiab cov kua muag los yog rub tawm. Ntau dhau lawm thiab nws tsiv mus rau saum npoo thaum lub sij hawm, ib qho mob hu ua phaj - tawm uas tshwm sim raws li ib tug greasy zaj duab xis, paj, los yog ib tug luam uas yuav tsis ua raws li. Phaj- tawm tsis yog qhov tsis xws luag hauv kev cia. Nws tau txiav txim siab ntawm qhov sib xyaw ua ke thiab tsuas yog siv ob peb lub hlis los txog.

Impact modifiersua raws li lawv lub npe hais. Rigid PVC tsis muaj lawv yog nkig, thiab ib daim ntawv uas tawg thaum lub ces kaum poob yog tshwm sim. Chlorinated polyethylene, acrylic thiab MBS hom txhua yam ua haujlwm, ntawm kev thauj khoom uas tuaj yeem ncav cuag yim phr. Lawv raug nqi nyiaj thiab txo qhov nruj, uas ua rau lawv thawj kab khoom yuav tsum tau txiav thaum tus nqi yuav tsum tau nqis los.

Titanium dioxidemuab cov xim dawb thiab nqa ib feem ntawm UV load. Cov qib tseem ceeb: rutile yog daim ntawv siv lead ua ruaj khov rau kev ua haujlwm sab nrauv, thiab kev kho saum npoo ua rau cov khoom los ntawm degrading cov polymer lawv tiv thaiv. Nyob rau sab saum toj ntawm ntau daim ntawv dawb tuav nws cov xim los ntawm ntau xyoo ntawm kev raug. Hauv qab ntawm nws yog xim av thiab grey.

UV stabilizerslis cov xim tsis muaj dab tsi, los ntawm hindered amine teeb stabilizers thiab UV absorbers. Lawv raug ntxiv rau cov qib sab nrauv thiab tshem tawm rau sab hauv, uas yog vim li cas tib qhov chaw tiav tuaj yeem coj txawv txawv nyob ntawm qhov chaw nws tau teeb tsa.

Cov txiaj ntsig ntawm txhua qhov no yog tias daim ntawv teev cov ntaub ntawv tuaj yeem sib piv ob nplooj ntawv kom raug thiab tseem qhia koj tsis muaj dab tsi txog qhov twg yuav zoo ib yam hauv xyoo peb. Cov lej piav qhia qhov tshwm sim. Lub formulation piav txog qhov trajectory. Kev yuav ntawm tus lej ib leeg yog yuav yav dhau los.

Lub ntsej muag laminated zais cov tub ntxhais tag nrho. Txhua yam nyob hauv qhov sib xyaw yog tam sim no tsis pom, uas yog vim li cas cov lus nug yuav tsum tau nug ua ntej zaj yeeb yaj kiab mus.

Koj tsis tuaj yeem tshawb xyuas cov qauv ntawm lub thawv xa khoom. Qhov koj tuaj yeem ua tau yog nug plaub nqe lus nug uas cais cov txheej txheem tswj hwm los ntawm ib qho improvised, thiab tom qab ntawd rov qab nrog cov tshev koj tuaj yeem khiav ntawm tus qauv.

Ces khiav yam koj ua tau lub cev. Ntsuas ib daim ntawv thiab faib los ntawm nws lub ntim kom paub meej tias qhov kev thov ceev. Txiav ib ntu thiab saib seb cov qauv ntawm tes yog txawm hla lub thickness los yog concentrated nyob rau hauv nruab nrab. Tsav tus ntsia hlau rau hauv ntug thiab saib seb nws yuav siv sij hawm ntau npaum li cas ua ntej nws strips. Muab ib qho piv txwv sab nraud rau ib lub caij thiab muab piv rau ib qho uas khaws cia hauv tsev.

Tsis muaj ib qho ntawm cov kev xeem no qhia txog kev tsim. Ua ke lawv yuav qhia koj seb tus neeg muag khoom puas tuav ib qho. Rau ib daim duab fuller ntawm yuav ua li cas lub extrusion variables qab tag nrho cov no yog tswj, peb tawg ntawmPVC ua npuas ncauj board ntau lawmua raws kab kawg kom kawg.