1. I. Yuav ua li cas tshwm sim thaum lub Photon tsoo koj lub laj kab ntawm Sunrise
2. II. Cov Lus Nug Inhibitor Tsis muaj leej twg nug ntawm Lub Rooj Muag Khoom
3. III. Vim li cas Ntoo Panels Poob Lawv Lub Siab Yuav Nyob Tom Qab Peb Lub Caij Ntuj Sov
4. IV. Hlau tsis hlawv nyob rau hauv UV-Nws tsuas yog ntsiag to surrenders
5. V. Composite thiab Ib nrab -Kev Ntsuas Teeb Meem
6. VI. 3,000 Teev nyob rau hauv Huab Cua Chamber-thiab Cov Ntaub Ntawv Yuav Tsis Qhia Koj

Feem ntau cov neeg yuav khoom rau lub laj kab ib puag ncig siv lawv lub hlwb lub zog ntawm cov yeeb ncuab pom tseeb: los nag, rot, termites, xeb. Lawv khiav lawv cov ntiv tes hla cov qauv slats thiab nug txog kev cuam tshuam lub zog. Lawv xav paub seb cov posts yuav hem nyob rau hauv ib tug Frost. Qhov no yog txhua yam tsim nyog. Nws kuj yog, nyob rau hauv ib tug ntsiag to txoj kev, ib qeb yuam kev. Ib qho kev quab yuam tsis tu ncua ua rau lub laj kab sab nraum zoov tsis yog dej, tsis yog kab, tsis yog kev ntxhov siab. Nws tuaj txog ntsiag to, tsis muaj nqi, thiab ntawm kwv yees li 300,000 kilometers ib ob. Thiab nws ua haujlwm ntawm cov khoom siv txhua hnub lub hnub tuaj.

Ultraviolet hluav taws xob dismantles polymers ntawm qib molecular. Cov txheej txheem yog tsis pom mus txog thaum nws tsis yog. Ib lub laj kab uas zoo li pristine nyob rau lub hli rau tuaj yeem pom cov paj chalky los ntawm lub hli peb caug, thiab los ntawm xyoo plaub lub ntsej muag yog hmoov, xim tau hloov ob ntxoov mus rau grey, thiab cov neeg kho tshuab kev ncaj ncees ntawm txheej txheej yog ploj mus. Cov lus nug tsim nyog nug tsis yog seb cov khoom siv tiv thaiv UV. Txhua yam khoom ntawm kev ua lag luam thov qee qhov kev tiv thaiv UV. Cov lus nug tiag tiag yog yuav ua li cas qhov kev tawm tsam no raug tsim kho, nws raug nqi dab tsi los ua kom raug, thiab yuav ua li cas thaum nws ua tau pheej yig. Rau importers thiab cov neeg cog lus qhia meejPVC fencing systemsthoob plaws ntau qhov chaw ua haujlwm, qhov sib txawv ntawm lub laj kab uas tuav nws cov xim rau kaum tsib xyoos thiab ib qho uas chalks hauv peb tuaj yeem taug qab mus rau ib qho kev txiav txim siab ntawm tes hauv kab extrusion- kev txiav txim siab uas tsis muaj daim ntawv teev npe yuav tuaj yeem pab dawb tshwj tsis yog koj paub nug.

Kab lus no tsis tau sim tshawb xyuas txhua yam khoom siv fencing puas tau muag. Nws tsom mus rau ib qho kev sib txawv -ultraviolet resistance- thiab ua raws nws los ntawm tsib pawg khoom, ncua qhov twg cov tshuaj tsis haum thiab qhov twg cov lus thov kev lag luam tau nplua. Lub hom phiaj tsis dav. Lub hom phiaj yog kom nkag siab txog ib qho kev degradation mechanism zoo txaus tias qhov kev sib tham tom ntej yuav txawv.

Ib photon nyob rau hauv UV spectrum-wavelength qhov chaw ntawm 290 thiab 400 nanometers- nqa lub zog txaus los rhuav tshem cov pa roj carbon-carbon covalent daim ntawv cog lus. Thaum lub photon ntaus ib tug polymer saw nyob rau saum npoo ntawm lub laj kab vaj huam sib luag, nws tsis thaws tawm harmlessly. Nws hloov lub zog rau hauv cov qauv molecular. Yog hais tias lub zog dhau ntawm daim ntawv cog lus dissociation zog ntawm ib qho kev sib txuas, daim ntawv cog lus cleaves. Ib daim ntawv dawb radical. Qhov ntawd radical, tshaib plab rau ib qho hluav taws xob, grabs ib tug los ntawm ib tug nyob sib ze saw, tsim ib tug thib ob radical nyob rau hauv tus txheej txheem. Ib txoj saw hlau pib.

Cov txiaj ntsig pom kev lag luam chemistry los ntawm lub hlis lossis xyoo, uas yog vim li cas UV ua rau neeg ruam. Tsis muaj qhov xwm txheej tsis txaus ntseeg. Tsis tawg propagates audibly. Tsis muaj xeb tawg tshaj tawm nws tus kheej hauv txiv kab ntxwv. Xwb, lub polymer nto maj mam oxidizes. Tsawg-molecular- cov khoom hnyav txav mus rau qhov chaw thiab raug ntxuav los yog cua tshuab raws li cov hmoov microscopic- qhov no yog chalking. Cov khoom seem dhau los ua hla- txuas thiab nkig. Pigment particles, tsis muaj kev khi txaus nyob rau hauv lub polymer matrix, poob lawv cov optical continuity nrog rau saum npoo. Cov xim ploj mus. Lub gloss poob.

Dab tsi ua rau qhov no tsim nyog nkag siab ntawm qib kev yuav khoom yog tias txhua qhov laj kab cov khoom siv tau ntsib qee qhov ntawm qhov cascade no. Qhov sib txawv yog qhov tob npaum li cas qhov kev puas tsuaj nkag mus, nws nrawm npaum li cas, thiab seb cov khoom puas muaj cov khoom tsim los ntawm - hauv kev cuam tshuam cov saw hlau cov tshuaj tiv thaiv ua ntej nws siv qhov chaw. Cov txheej txheem no kim heev. Lawv kuj tsis pom nyob rau hauv chav ua yeeb yam uas tsis tau pom hnub ci.

PVC, sab laug rau nws tus kheej cov khoom siv tshuaj, yog ib feem ntawm UV-sensitive ntau polymers. Tsis ruaj tsis khov PVC raug tshav ntuj sab nraum zoov yuav tsis muaj xim nyob rau hauv lub lis piam thiab embrittle nyob rau hauv lub hlis. Qhov no tau tsim muaj nyob rau hauv cov ntaub ntawv tshawb fawb polymer thiab nws yog, hauv kev nkag siab, tag nrho vim li cas kev sib tham txog PVC fencing UV tiv thaiv yog kev sib tham txog cov khoom ntxiv, tsis yog hais txog PVC nws tus kheej.

Lub tswv yim tiv thaiv hauv PVC laj kab loj profile ua haujlwm tsawg kawg peb theem. Titanium dioxide-tshwj xeeb yog lub rutile siv lead ua daim ntawv, nto- kho kom txo cov photocatalytic kev ua si - ua raws li UV tshuaj ntsuam xyuas, tawg thiab nqus cov photons tuaj ua ntej lawv mus txog lub polymer matrix. Qhov no yog thawj kab ntawm kev tiv thaiv thiab nws yog, tshuaj lom neeg hais lus, bluntest ntsuas nyob rau hauv cov khoom siv. Tshaj li kwv yees li 8 mus rau 10 feem ntawm ib puas resin, ntxiv TiO₂ xa rov qab poob qis; koj tsuas yog ntxiv opacifier ntawm qhov ntawd, tsis muaj txiaj ntsig zoo txhim kho UV tiv thaiv. Cov kab thib ob yog UV absorber-feem ntau yog benzotriazole lossis benzophenone compound- uas hloov UV lub zog rau hauv qis- theem cua sov thiab dissipates nws tsis muaj mob. Qhov thib peb thiab sophisticated kab feem ntau muaj hindered amine teeb stabilizers, los yog HALS, uas tsis nqus UV kiag li. Lawv khawb cov dawb radicals tom qab lawv tsim, cuam tshuam qhov degradation cascade mid{14}} saw. HALS yog regenerative: cov tshuaj tiv thaiv scavenging ua rau nitroxyl radical uas tuaj yeem koom rau hauv lub voj voog dua, uas yog vim li cas HALS-stabilized systems tuaj yeem tiv thaiv tau ntau xyoo ntawm cov khoom ntxiv uas tsis tshua muaj.

Txhua tus compounder tuaj yeem pov TiO₂ rau hauv lub plhaw. Kev yuav khoom- lo lus nug tseem ceeb yog seb TiO₂ puas yog rutile lossis anatase-anatase ua aggressively photocatalytic, nquag ua kom cov polymer tawg nyob rau hauv UV es tsis retarding nws-thiab seb nws puas tau nto- kho nrog silica los yog alumina totic zoo li ntawd. Cov lus nug ntxiv: Puas yog HALS oligomeric lossis monomeric? Oligomeric HALS tsiv mus rau saum npoo qeeb dua, txhais tau tias kev tiv thaiv txuas ntxiv mus rau hauv cov khoom siv lub neej. Puas yog pob stabilizer tau concentrated nyob rau hauv ib co-extruded cap txheej, los yog nws muab faib uniformly los ntawm tag nrho cov phab ntsa thickness? Txoj hau kev - txheej txheej muab kev tiv thaiv raws nraim qhov chaw ntawm photons, nyob rau hauv siab dua, tsis tau them nyiaj rau stabilizers nyob rau hauv cov tub ntxhais uas tsis muaj UV puas mus txog. YUPSENI muab cov khoom siv co-extruded laj kab profiles nrog cap- txheej TiO₂ loading thiab HALS concentration txheeb xyuas tawm tsam batch{12}} tshwj xeeb spectrophotometric dispersion cov ntaub ntawv-cov ntaub ntawv ib qho tseem ceeb importer yuav tsum tau thov, vim nws yog tib txoj kev txhim khu kev qha cov ntaub ntawv pov thawj uas tau teev nyob rau hauv lub tab hais concentration rau qhov kev khiav haujlwm.

Ntoo txoj kev sib raug zoo nrog lub teeb ultraviolet yog qhov sib ntaus sib tua tsawg dua li kev swb nrog cov ntaub ntawv. Lignin, lub complex phenolic polymer uas khi cellulose fibers ua ke thiab muab ntoo nws cov yam ntxwv rigidity, absorbs UV hluav taws xob nrog grim efficiency. Lub zog tawg lignin rau hauv dej- cov khoom tawg yooj yim uas los nag ntxuav tawm, nthuav tawm cov cellulose tsis muaj fiber ntau ntawm qhov chaw. Cov fibers, tam sim no tsis muaj kev tiv thaiv, tawg lub teeb txawv dua li cov ntoo tsis zoo. Qhov saum npoo tig grey. Cov nplej nce. Micro- tawg qhib, muab cov ntsiab lus nkag rau cov dej noo, uas ua rau caw cov kab mob fungal. Dab tsi tau pib raws li cov tshuaj tiv thaiv photochemical ntawm qhov chaw ua, nyob rau hauv ob lossis peb lub caij nyoog, ib qho teeb meem degradation ntawm cov tshuab txuas mus rau millimeters rau hauv lub substrate.

Tus qauv tiv thaiv yog txheej txheej -stain, xim, lossis sealant- muaj nws tus kheej UV absorbers thiab pigments. Tab sis ib txheej yog txheej txheej los ntawm kev tsim. Nws chalks thiab erodes, thiab thaum nws ua, ntoo hauv qab yog ib zaug rov liab qab. Lub sijhawm re- txheej txheej nyob rau hauv tag nrho- tshav ntuj tsis tshua muaj ntau tshaj 24 mus rau 36 lub hlis rau pob tshab thiab ib nrab- pob tshab stains. Opaque xim kav ntev dua tab sis tsis pom cov qauv zoo heev uas txhawb kev xaiv ntoo hauv thawj qhov chaw. Tshaj li 15-xyoo qhov kev pabcuam, lub laj kab ntoo hauv qhov siab-UV thaj chaw yuav siv rau rau txog yim lub voj voog tu. Tus nqi ntawm cov khoom siv ntawm cov coatings, ntxiv rau kev ua haujlwm los siv lawv, feem ntau tshaj li tus nqi qub installation. Qhov no yog UV se uas ntoo cov ntaub ntawv tsis qhia tawm-tsis yog vim nws tau muab zais, tab sis vim nws poob rau sab nraud ntawm cov khoom siv tshwj xeeb nkaus xwb. Nws dhau los ua tus tswv qhov teeb meem.

Tsis muaj qhov no ua rau ntoo ua cov khoom tsis zoo. Nws ua rau ntoo yog cov khoom uas nws UV tsis kam yog sab nraud, rov ua dua tshiab, thiab ua haujlwm- hnyav-peb lub npe uas cov neeg ua haujlwm muag khoom them tus nqi ntawm ntau- qhov chaw fencing cov khoom lag luam nyiam nyeem raws li cov kab hauv kaum xyoo- cov peev nyiaj saib xyuas. Rau kev sib piv sib sib zog nqus ntawm tag nrho cov nqi ntawm cov khoom, lub20-xyoo tus nqi tsom xam ntawm PVC laj kab tiv thaiv ntoo, txhuas, thiab hlautaug kev los ntawm cov lej uas pib cov lus tawm tawm.

Cov hlau substrate nws tus kheej yog indifferent rau ultraviolet hluav taws xob. Hlau, aluminium, thiab wrought hlau tsis dhau photodegradation nyob rau hauv ib qho kev nkag siab zoo. Yog tias cov laj kab tau ua los ntawm liab qab, tsis muaj hlau tsis muaj hlau thiab txiav txim siab ntawm cov qauv kev ncaj ncees, kev sib piv UV yuav yog ib nqe lus luv luv uas xaus rau qhov kev txiav txim siab rau cov hlau. Tab sis laj kab tsis yog ua los ntawm liab qab hlau. Lawv yog coated- hmoov-coated, pleev xim rau, los yog galvanized- thiab cov txheej yog ib tug polymer system raws nraim tib yam photodegradation chemistry piav nyob rau hauv Tshooj I.

Polyester-raws li cov hmoov coatings, qhov tseem ceeb tiav ntawm architectural aluminium thiab steel fencing, chalk thiab ploj nyob rau hauv UV raug rau lub sij hawm uas nyob ntawm yuav luag tag nrho ntawm qhov zoo ntawm TGIC los yog HAA crosslinker system thiab UV stabilizer loading nyob rau hauv lub formulation. Cov txheej txheem kev lag luam rau architectural hmoov txheej qhia qhov tsawg kawg nkaus ntawm ib xyoos Florida raug tsis muaj ntau tshaj li qhov teev tseg delta -E xim hloov thiab gloss retention feem pua. Ib xyoos. Ntau qhov nruab nrab - cov kab ke caij nkoj mus txog xyoo ib thiab tom qab ntawd degrade sai sai hauv xyoo ob txog tsib xyoos vim tias UV absorbers nyob ze ntawm qhov chaw tau noj thiab tsis rov ua dua. Thaum cov txheej tsis ua haujlwm hauv zos- ntawm qhov khawb, qhov txiav ntug, lub qhov txuas- noo noo mus txog cov hlau. Ntawm hlau, corrosion pib. Ntawm aluminium, qhov corrosion qeeb qeeb tab sis cov txheej txheej delamination yog ib yam li irreversible. Lub laj kab hlau uas zoo li tsis muaj kev puas tsuaj hauv chav ua yeeb yam tshuav nws cov UV tiv thaiv rau ib txheej ntawm cov yas li ntawm 60 txog 80 microns tuab. Cov txheej ntawd tsis tuaj yeem kho yam tsis muaj stripping thiab rov- txheej tag nrho cov khoom.

Qhov sib piv nrog PVC fencing tsis yog hlau piv rau yas. Nws yog 60-micron txheej tiv thaiv lub hau txheej feem ntau 300 txog 500 microns tuab, uas UV stabilizer tsis yog pleev xim rau saum npoo xwb tab sis co-extruded ua ib feem tseem ceeb ntawm cov polymer yaj-lub ntsiab lus tsis muaj cov nplaum cuam tshuam rau kev sib sib zog nqus, tsis muaj kev tiv thaiv ntau dua li kev tiv thaiv corrosion. txheej yuav xyaum xa.

Ntoo-yas composite fencing nyob rau hauv txoj hauj lwm txawv txawv ntawm UV sib tham. Cov khoom siv yas-feem ntau yog polyethylene, polypropylene, lossis PVC- tuaj yeem ruaj khov nrog cov khoom siv tib yam siv hauv cov tshuab polymer ntshiab. Cov hmoov nplej hmoov tsis tuaj yeem. Ntoo fibers ntawm los yog ze ntawm qhov sib xyaw nto nqus UV, degrade, thiab erode raws nraim li tau piav qhia hauv Tshooj III. Cov yas matrix uas tseem tshuav yog dab ntawm qhov qub nto: qhov seem tsis zoo tab sis roughened, nrog cov khoom muab tub lim nthuav tawm tsim cov khoom siv microscopically pitted kev ntxhib los mos uas ntxiab av thiab ua kom muaj kev puas tsuaj ntxiv.

Ntau tus neeg tsim khoom sib xyaw hais txog qhov no nrog cov co-extruded polymer cap stock-tseem ceeb yog PVC lossis ASA plhaub qhwv ib ncig ntawm ntoo- cov tub ntxhais uas muaj puv. Qhov no yog ib qho kev txawj ntse engineering teb thiab nws coj lub UV kev ua tau zoo ntawm cov capped composite rau hauv ntxhib parity nrog ib tug zoo stabilized PVC profile. Tab sis nws kuj ua rau cov lus nug tsis xis nyob: yog tias kev daws teeb meem rau ntoo hmoov UV qhov tsis zoo yog txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm Lub hau txheej ua haujlwm tag nrho UV. Cov hmoov nplej hauv cov tub ntxhais yog nrog rau kev caij tsheb - ntxiv qhov hnyav, muaj peev xwm nqus dej noo los ntawm qhov kawg - txiav tawm, thiab ua rau qhov profile nyuaj rau rov ua dua thaum kawg ntawm lub neej. Cov neeg nyeem ntsuas qhovtag nrho cov nqi thiab durability sib piv thoob cov khoom laj kabyuav pom tias qhov sib xyaw ntawm UV zaj dab neeg thaum kawg yog zaj dab neeg polymer nrog cov kauj ruam ntxiv thiab ntoo -fiber- zoo li lub hnub qub.

Accelerated weathering yog ib tug tswj kev dag uas tshwm sim los ua lub cuab tam zoo tshaj plaws muaj. Lub xenon arc teeb los yog fluorescent UV array bombards ib tug qauv nrog hluav taws xob nyob rau hauv lub intensities deb tshaj lub ntuj tshav ntuj, thaum kub thiab av noo voj voog nyob rau hauv ib tug programmed lub sij hawm los simulate lub hlis ntawm sab nraum zoov raug nyob rau hauv hnub los yog lub lis piam. ASTM G154, ISO 4892, thiab cov qauv zoo sib xws qhia cov cuab yeej siv hluav taws xob, kev faib hluav taws xob spectral, thiab lub voj voog tsis sib xws. Ib tus neeg xa khoom uas tshaj tawm "3,000 teev QUV nrog delta-E qis dua 3" tab tom ua daim ntawv thov rau qhov kev xeem rov ua dua. Qhov ntawd yog cov ntaub ntawv tseem ceeb tiag tiag. Nws tseem yog cov ntaub ntawv uas yuav tsum tau nug, tsis lees txais ua tus neeg sawv cev rau kaum xyoo ntawm kev pabcuam hauv ntiaj teb tiag.

Thawj qhov teeb meem yog spectral mismatch. Xenon arc teeb kwv yees lub hnub ci spectrum tsim nyog zoo nyob rau hauv UV ntau. Fluorescent UV-B 313 teeb tsis; lawv emit luv- wavelength UV uas yog qhov tseem ceeb tsis tuaj ntawm lub hnub ci ntuj ntawm lub ntiaj teb saum npoo av, thiab lawv tuaj yeem tsim degradation uas tsis muaj qhov sib txawv sab nraum zoov. A 3,000-teev tshwm sim nyob rau hauv UV-B 313 tsis qhia meej meej rau qee lub xyoo hauv Miami, Phoenix, lossis Singapore. Qhov teeb meem thib ob yog qhov kev ntsuas nrawm feem ntau ua haujlwm tsis tu ncua- tsis muaj lub sijhawm tsaus ntuj, tsis muaj qhov hloov pauv raws caij nyoog ntawm lub kaum sab xis ntawm qhov xwm txheej, tsis ntub dej - caij tsheb kauj vab qhuav uas phim cov qauv dej nag tiag tiag. Radical recombination thiab stabilizer regeneration txheej txheem uas tshwm sim thaum lub sij hawm tsaus ntuj nyob rau hauv tej yam ntuj tso raug yog suppressed. Qhov kev sim no yog ua rau kev puas tsuaj sai dua li qhov kev pabcuam tiag tiag, uas yog kev saib xyuas hauv ib qho kev nkag siab tab sis ua yuam kev hauv lwm qhov: nws tuaj yeem ua rau ob yam khoom zoo sib xws uas yuav sib cais ntau txaus rau lub sijhawm tiag tiag thiab lub sijhawm tsaus ntuj.

Tom qab ntawd muaj cov lus nug uas cov ntawv xeem tsis tau teb: puas yog cov qauv tsim khoom rub tawm los ntawm kev ua lag luam, lossis chav kuaj cov quav hniav compression- molded los ntawm nkauj xwb compound nyob rau hauv zoo tagnrho tej yam kev mob? Cov qauv kuaj muaj cov tuab tuab, xoom ua keeb kwm, thiab tsis muaj cov kab sib txuas, cov ntsiab lus rov ua dua, lossis extrusion- cov kev taw qhia kev taw qhia. Lawv tsis yog cov khoom uas tus neeg tau txais. Thaum YUPSENI muab ceev huab cua cov ntaub ntawv rau nwsco-extruded PVC laj kab profiles, cov qauv kuaj tau raug txiav los ntawm kev tsim khoom-extruded profiles, tsis kuaj compression moldings-vim qhov kev kuaj UV ntawm cov quav hniav qhia rau koj txog qhov sib xyaw, tab sis nws tsis qhia koj tsis muaj dab tsi txog seb tus stabilizer puas muaj sia nyob ntawm cov txheej txheem extrusion tsis zoo. Cov no yog cov kev sib txawv uas cais cov ntawv tshaj tawm huab cua tsim nyog nyeem los ntawm ib qho tsim nyog tsis quav ntsej.

Rau ib qhov project hauv high -UV geography, cov lus nug uas yog los muab rau tus neeg muag khoom tsis yog "cov khoom no puas dhau qhov kev kuaj UV." Nws yog: qhia kuv qhov delta -E thiab gloss retention ntawm txhua 500-teev nce ntxiv, tsis yog qhov kawg nkaus xwb. Ib yam khoom uas maj mam dhau ntawm qhov kev sim tag nrho muaj qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv dua li ib qho uas ruaj khov rau 2,000 teev thiab tom qab ntawd deteriorates sai li cov stabilizers depleted. Tus lej kawg tsis pom qhov txawv no. Kev txiav txim siab ntawm kev yuav khoom tau ua los ntawm cov ntaub ntawv kawg nkaus ib leeg yog, qhov tseeb, yuav cov ntaub ntawv sau tseg yam tsis tau nyeem daim ntawv qhia.

Ultraviolet kuj nyob rau hauv fencing tsis yog ib yam khoom uas cov ntaub ntawv tsuas muaj los yog tsis muaj. Nws yog ib yam khoom uas tau yuav, tsim kho, txheeb xyuas, thiab - thaum cov ces kaum raug txiav - ntsiag to tshem tawm. Txhua yam khoom sib tham ntawm no tuaj yeem ua kom ua tau zoo nyob rau hauv tshav ntuj. Qhov sib txawv ntawm pawg tsis yog UV tiv thaiv tau tab sis qhov nws raug nqi kom ua tiav, nws kav ntev npaum li cas, thiab seb lub tshuab yog ib qho tseem ceeb rau cov khoom siv lossis siv raws li kev xav tom qab.

PVC fencing nyob rau hauv qhov chaw zoo nyob rau hauv toj roob hauv pes no tsis yog vim PVC yog inherently UV-resistant- nws tsis yog -tab sis vim cov co-extrusion txheej txheem tso cai rau ib tug concentrated, precisely formulated stabilizer pob yuav tsum tau muab tso rau raws nraim qhov chaw ntawm photons av, ntawm ib tug tuab zaj duab xis uas tsis muaj tshuaj tsuag txheej. Lub hau txheej ntawd yog lub pas dej ntawm kev tiv thaiv ntsuas hauv ntau pua microns, tsis yog kaum. Nws raug tshuaj xyuas ntawm kab extrusion, tsis siv rau hauv daim teb. Thiab thaum nws tau txais kev txhawb nqa los ntawm batch- qib spectrophotometric pov thawj es tsis yog daim ntawv tsim qauv, cov lus nug hloov ntawm "yuav lub laj kab no tiv thaiv UV" mus rau "peb xyoo lawm koj puas xav tau nws mus ntev."

Lub hnub yuav nce ntxiv. Cov photons yuav tuaj txog ntawm 300,000 kilometers ib ob. Cov laj kab uas muaj sia nyob lawv yuav yog cov uas nws chemistry tau tsim los rau qhov kev sib ntsib ntawd -tsis yog cov uas lawv daim ntawv qhia tsuas yog lees tias yog.

Rau ib kauj ruam-los ntawm- cov lus qhia kauj ruam kom ntseeg tau tias lub laj kab ua haujlwm thoob plaws txhua qhov kev hloov pauv, tsis yog UV,PVC laj kab installation qhiasuav nrog kev tshaj tawm - teeb tsa, kev nthuav dav ntxiv, thiab rau rau feem ntau hu rov qab. Cov neeg xav txog cov khoom siv dav dav tuaj yeem nrhiav tauxya txoj cai golden rau xaiv lub laj kab PVCpab tau raws li daim ntawv teev kev yuav khoom.