PUR Vs. EVA Kub Melt Adhesives: Txheej Txheej Txheej Txheem Ntawm Ob Lub Tshuab Sib Txawv
Taug kev mus rau hauv ib qho txheej txheej thiab koj yuav pom ib qho ntawm ob yam: tus qauvEVA kub yaj systemkhiav ntawm qhov nrawm nrawm, lossis PUR teeb tsa nrog nws cov tso tsheb hlau luam kaw thiab ya raws - pov thawj hoses. Ob leeg yog kub melts. Ob leeg yog 100% solids thiab hnyav-dawb. Tab sis qhov ntawd yog qhov uas qhov zoo sib xws xaus.
Chemistry: Physical vs. Chemical
EVA (ethylene{0}}vinyl acetate) yog cov neeg ua haujlwm hauv kev lag luam. Nws yog ib qho thermoplastic resin uas yaj thaum rhuab, ntws mus rau lub substrate, thiab teem caij thaum nws txias. Qhov ntawd yog nws - lub cev nkaus xwb. Kub nws dua, thiab nws melts tag nrho dua. Reversible, yooj yim, thiab kwv yees tau.
PUR (polyurethane reactive) ua si sib txawv. Nws pib tib txoj kev - yaj, ntws, txias - tab sis ces lwm yam tshwm sim. Cov nplaum reacts nrog ambient noo noo (los ntawm huab cua los yog lub substrate nws tus kheej), ua cross- txuas polymer chains uas yog chemically bonded thiab irreversible. Thaum kho tau lawm, PUR yuav tsis yaj dua, txawm tias koj muab nws kub npaum li cas. Qhov kev sib txuas tshuaj lom neeg yog qhov chaw ntawm txhua yam PUR ua tau zoo dua.
Kev ua tau zoo: Qhov twg Gap Qhia
Muab lawv ib sab thiab cov lej qhia zaj dab neeg.
EVA ua haujlwm kub txog li 60-80 degree. Tshaj ntawd, daim ntawv cog lus softens. Txias? Nws tau nkig hauv qab 0 degree. Moisture? Ntev av noo tuaj yeem ua rau nws o thiab poob lub zog. Bond lub zog yog txaus rau cov ntaub ntawv ntxeem tau xws li ntawv, ntoo, thiab ntaub, tab sis nyob rau hauv uas tsis yog - ntxeem tau yas los yog hlau, nws nyuaj.
PUR, ib zaug kho tag nrho, tuav txog 120-150 degree. Nws nyob twj ywm hloov mus rau -40℃. Kev tiv thaiv dej zoo heev - tus ntoo khaub lig- txuas cov qauv yog hydrophobic heev. Peel zog feem ntau hits 5–{9}} N / mm, piv rau EVA's 2–5. Thiab nws bonds rau hlau, iav, kho plastics, coated nto - cov ntaub ntawv EVA kov tsis tau.
Txheej Txheej: Dab tsi hloov
Rau cov txheej txheem txheej, qhov sib txawv mus dhau ntawm cov nplaum nws tus kheej.
EVA zam txim. Standard qhib melters ua haujlwm zoo. Cia yooj yim - chav tsev kub, 12-24 lub hlis txee lub neej. Daim ntawv thov kub feem ntau khiav 150-180 degree. Nws yog pheej yig ib kilogram thiab yooj yim khiav.
PUR xav tau ntau dua. Lub ntim ntim yuav tsum tau ua kom cov dej noo tawm ua ntej siv. Lub tsev melting xav tau tshwj xeeb uas tsis yog - nplaum txheej thiab yuav tsum yog airtight. Daim ntawv thov kub qis dua - 110–140℃- tab sis cov cuab yeej raug nqi ntau dua. Lub neej txee yog luv dua: kaw nruas ntawm 0-35 degree, tsawg dua rau lub hlis. Thiab koj tsis tuaj yeem tawm PUR zaum hauv lub tank ntev dhau, lossis nws pib kho koj.
Qhov twg Txhua Yeej
EVA dominates ntim khoom - thawv sealing, tray forming, e-commerce boxes. Bookbinding, labeling, rooj tog edgebanding rau cov qauv siv. Nws ceev ceev, pheej yig, thiab ua haujlwm tiav.
PUR qhia txog qhov twg EVA tsis tuaj yeem muaj sia nyob. Automotive interiors, qhov twg cov cua sov thiab cov tshuaj tsis tu ncua. High-cov rooj tog zaum kawg nrog "zero" kab ntawv cog lus. Profile wrapping rau qhov rais thiab qhov rooj. Cov cuab yeej kho mob sib dhos. Nyob qhov twg daim ntawv cog lus yuav tsum outlast cov khoom.
Kab hauv qab
Kev xaiv ntawm EVA thiab PUR tsis yog hais txog qhov "zoo dua." Nws yog hais txog qhov koj daim ntawv thov xav tau. EVA yog tus nqi -cov haujlwm ua haujlwm tau zoo rau cov haujlwm siab - ntim, qis- txoj haujlwm nyuaj. PUR yog qhov kev daws teeb meem zoo tshaj plaws rau kev ruaj khov, siab - kev ua haujlwm tau zoo hauv qhov chaw xav tau.
Ib lub chaw tsim khoom muab nws yooj yim: "EVA yog qhov zoo tagnrho rau cov ntawv thov uas xav tau kev sib txuas ntawm lub cev thiab rov ua dua tshiab. PUR yog qhov zoo dua rau cov ntawv thov kom ruaj khov, tshuaj sib txuas nrog kev ua haujlwm siab hauv kev ntxhov siab". Cov khoom siv txheej txheej? Nws yuav tsum phim cov nplaum uas koj xaiv - thiab qhov kev xaiv ntawd pib nrog kev nkag siab yam koj cov khoom xav tau tiag tiag.
(Rau cov ntawm peb lub tsev txheej txheej, peb pom qhov kev txiav txim siab no tawm txhua hnub. Cov nplaum zoo hauv lub tshuab tsis raug yog ib daim ntawv qhia txog teeb meem. Cov nplaum tsis zoo hauv lub tshuab yog? Txawm tias phem dua.)
Yog tias koj xav paub ntau ntxiv lossis sib tham txog kev xaiv customization, thov hu rau peb!
