In autumn and winter, the temperature is low, and the EPS production process is sensitive to the temperature. Recently, many clients reported that there were problems with many raw materials, because they used to be very light. Now they do it according to the previous parameter method, the board is heavy, cracked, shrunk, etc. And this situation is relatively common. So the temperature is generally low in winter. What is the reason for this phenomenon? Is there really a problem with the raw materials? Or something else? What is the essence of this?
Qhov kub ntawm cov hlaws ua npuas tsuas yog xa tawm los ntawm lub tshuab ua ntej nthuav dav yog feem ntau ntawm 40 50 degree, thiab qee qhov nthwv dej nkag mus rau hauv cov hlaws ua npuas ncauj thaum lub sijhawm ua ntej nthuav dav. Cov hlaws ua npuas dej kuj tseem ntub. Tom qab cov hlaws ua npuas dej raug tso tawm los ntawm qhov hluav taws xob ntawm lub tshuab ua ntej nthuav dav, vim qhov kub sib txawv ntawm cov hlaws ua npuas dej thiab ib puag ncig, cov seem foaming tus neeg sawv cev thiab cov chav hauv cov hlaws ua npuas yuav sai sai rau hauv cov kua, thiab cov kua foaming tus neeg sawv cev. yuav yaj mus rau hauv cov polystyrene ua npuas ncauj hlaws, Lub siab nyob rau hauv lub npuas sai sai txo, thiab muaj ib tug tsis zoo siab (los yog ib feem ntawm lub nqus tsev vacuum) nyob rau hauv. Nyob rau lub sijhawm no, cov npuas tshwm muag muag, thiab yooj yim rau deform. Lawv tsis tuaj yeem ua EPS ua npuas ncauj khoom txhua.
Tom qab ripening, ntawm ib sab, nws yog qhuav, ntawm qhov tod tes, nws tso cai rau huab cua nkag mus rau hauv lub hauv paus ntawm cov hlaws dai kom tshem tawm qhov tsis zoo siab, sib npaug ntawm sab hauv thiab sab nraud siab ntawm cov hlaws ua npuas ncauj, ua npuas ncauj hlaws. thiab elastic, xyuas kom meej qhov nthuav dav ntawm cov hlaws ua npuas ncauj thiab fusibility ntawm cov hlaws thaum lub sij hawm molding, thiaj li los txhim kho qhov zoo ntawm EPS cov khoom.
Tom qab nkag siab txog cov txheej txheem ntawm kev nthuav dav thiab ripening, yog tias cov thermal rwb thaiv tsev ntawm pre nthuav dav thiab ripening rhiav nyob rau lub caij ntuj no tsis zoo, qhov kub thiab txias yog qis, thermal expansion thiab txias contraction ua rau cov hlaws dai thiab tawg yooj yim, thiab cov npuas hlaws. yog puas, ces nws tsis tuaj yeem rov qab thaum lub sij hawm ripening. Yog tias lub phaj hnyav dua yog ua rau lub sijhawm no, lub phaj yog yooj yim kom ntsws, nyiaj ntsuab, tawg thiab ua hnyav dua. Muaj qhov zoo tshaj plaws tus nqi rau qhov dav dav ripening kub uas yog 18 22 degree, thiab huab cua nkag mus rau hauv cov hlaws dai, thaum lub pentane hauv cov hlaws ua npuas ncauj yeej tsis tawm sab nraud. Thaum qhov kub siab tshaj 22 degree, huab cua infiltration tus nqi nce thiab ceev, thiab sab nraud diffusion tus nqi ntawm pentane kuj nce nyob rau tib lub sij hawm; Ntawm qhov tsis sib xws, yog tias qhov kub thiab txias qis dua 20 degree, huab cua nkag mus kuj tseem txo qis thiab lub sijhawm ripening ntev. Yog li ntawd, nws yog qhov zoo tshaj plaws los tswj qhov kub thiab txias ntawm 20 25 degree; Yog tias cov khoom tseem ceeb ntawm cov neeg siv khoom siv lub teeb, qhov kub ntawm lub rhiav ripening tuaj yeem tsim nyog nce mus txog 28. (cov ntaub ntawv tsuas yog siv rau kev siv xwb thiab yuav tsum ua raws li cov kev cai ntawm kev cob qhia.)
Peb txhua tus paub tias txhawm rau ua kom lub teeb pom kev zoo, cov txheej txheem ua ntej nthuav dav yuav tsum yog lub teeb, uas yog qhov ua tau zoo. Txawm li cas los xij, combing cov txheej txheem saum toj no, peb tuaj yeem piav qhia vim li cas qhov sib zog ua npuas ncauj yog, lub rooj tsavxwm hnyav dua?
Piv txwv li, lub teeb phaj:
1. First expanded: take one kind of pre expander machine as an example: it is found that it is heavy. In order to make the plate light enough, some workers will generally increase the whole body pressure to make the foam lighter. This is actually wrong. It's not that the higher the pressure, the lighter it will be. It depends on the situation. Light boards have two pre expander process. If first expander is too light, it is easy to destory the beads during the second expander. In this way, the board is heavy. Generally, the cylinder pressure shall not exceed 5.5kg, and the air inlet speed shall not be too fast, so that the material can be distributed evenly.
2. Qhov thib ob expander: EPS raw cov ntaub ntawv nthuav dav yuav tsum tau muab tso rau hauv lub ripening bin nrog lub kaum sab xis ntawm tsis tsawg tshaj li 20 degree thiab tsis ntau tshaj 40 degree. Yog tias nws qis dua 20 degree. Nyob rau tib lub sijhawm, lub sijhawm oxidation yuav tsum tsis pub tsawg dua 4 teev, thiab tom qab ntawd ua qhov thib ob nthuav dav. Ua li no, qhov hnyav ntawm lub phaj thiab qhov zoo ntawm lub phaj tuaj yeem lav. (cov ntaub ntawv no tsuas yog siv rau kev siv thiab yuav tsum tau ua raws li lub phaj tiag tiag.)
Yog li ntawd, yog hais tias qhov kub ntawm lub ripening bin yog tsawg heev, tshwj xeeb tshaj yog nyob rau hauv lub caij nplooj zeeg thiab lub caij ntuj no, lub caij txias thiab los nag yuav tshwm sim los ntawm qhov tseeb hais tias cov rwb thaiv tsev ntawm cov ntaub pua plag tsis zoo, thiab huab cua to nyob txhua qhov chaw. Qhov kub ntawm lub rooj cob qhia yuav luag zoo ib yam li sab nraud, yog li tus neeg sawv cev foaming hauv cov hlaws ua npuas dej yog kua thiab tsis tuaj yeem gasified thiab nthuav dav, uas ua rau shrinkage ntawm cov khoom ua npuas ncauj thiab cov tes tsis zoo ntawm cov khoom tiav. Yog tias koj xav ua ib lub teeb ci, koj yuav tsum ua kom hnyav dua. Yog li ntawd, nyob rau hauv lub caij nplooj zeeg thiab lub caij ntuj no, peb yuav tsum tau ntxiv dag zog rau lub thermal rwb thaiv tsev thiab cua sov ntawm lub silo Rhiav nyob rau hauv thiaj li yuav ua kom cov khoom zoo.
