Cov txheej txheem molding ntawm daim txhuam cev yog qhov txuas tseem ceeb uas txiav txim siab nws cov qauv morphology, lub cev lub cev, thiab cov yam ntxwv siv. Cov txheej txheem no, raws li cov ntaub ntawv polymer, tsim ib qho peb - qhov sib txawv ntawm qhov sib txuas los ntawm kev ua npuas dej thiab molding technologies, muab cov khoom yooj yim, absorbency, thiab resilience kom tau raws li qhov xav tau ntawm ntau yam kev siv.
Cov txheej txheem molding feem ntau pib nrog kev npaj raw khoom. Ib qho tsim nyog polymer matrix, xws li polyurethane, polyvinyl cawv, los yog lwm yam polymers hloov kho, yog xaiv raws li lub hom phiaj kev ua tau zoo, thiab catalysts, foaming agents, foam stabilizers, thiab functional additives yog ntxiv raws li cov qauv. Cov proportions ntawm txhua yam yuav tsum raug tswj kom meej meej kom ntseeg tau tias homogeneity ntawm cov tshuaj tiv thaiv kab mob thiab kev ruaj ntseg ntawm cov qauv cell tom ntej. Cov txheej txheem sib tov feem ntau siv siab - nrawm nplawm lossis sib xyaw zoo li qub kom ua tiav lub xeev homogeneous ntawm cov ntaub ntawv, tso lub hauv paus rau kev ua npuas dej zoo ib yam.
Foaming yog cov kauj ruam tseem ceeb hauv molding thiab tuaj yeem muab faib ua lub cev foaming thiab tshuaj foaming. Lub cev foaming cia siab rau qhov vaporization ntawm qis-boiling- taw tes cov kua hauv qab cua sov los yog lub siab hloov mus ua npuas, thaum cov tshuaj foaming ua rau cov roj los ntawm qhov decomposition ntawm tus neeg sawv cev foaming thaum lub sij hawm cov txheej txheem tshuaj tiv thaiv. Cov tshuaj tiv thaiv foaming tshwm sim nyob rau hauv cov pwm los yog cov kab ntau lawm. Qhov ntsuas kub, siab, thiab lub sijhawm ntsuas yuav tsum nruj me ntsis sib luag rau cov khoom siv los txhawb kev tsim cov cell sib xws thiab kho kom haum rau qhov xav tau kom ceev thiab qhov pore loj. Kev tsim ntawm qhib- cell lossis kaw- cov qauv ntawm tes feem ntau ua tiav los ntawm kev kho hom thiab tus nqi ntawm cov npuas dej stabilizer thiab tswj cov gelation tus nqi thiab cov roj diffusion tus nqi.
Lub molding theem ua raws tam sim ntawd tom qab foaming. Rau thaiv- cov ntaub npuag zoo li daim txhuam cev, lawv tuaj yeem txiav ncaj qha mus rau qhov ntev; rau rolls los yog cov khoom ntawm cov duab tshwj xeeb, kub nias, yob txoj kev, los yog molding yog siv los ua kom tiav cov duab ruaj khov nyob rau hauv lub hom phiaj los yog nkhaus qhov ntev. Cov theem no yuav tsum sib npaug thickness uniformity thiab nto smoothness kom tsis txhob muaj kev cuam tshuam rau kev ua haujlwm tom ntej.
Tom qab- kev kho molding suav nrog kev kho, ntxuav, thiab ziab. Curing tso tawm sab hauv kev ntxhov siab thiab stabilizes tus qauv; ntxuav tshem tawm cov khoom seem seem thiab cov khib nyiab; drying tswj cov ntsiab lus noo noo los tiv thaiv pwm kev loj hlob los yog kev ua haujlwm degradation. Qee daim ntawv thov kuj xav tau cov txheej txheej saum npoo los yog kev kho kom zoo los txhim kho hnav tsis kam, stain resistance, lossis cov khoom siv tshuaj tua kab mob.
Zuag qhia tag nrho, cov txheej txheem ua npuas ncauj moulding yog ib txoj haujlwm engineering uas sib xyaw ua ke tshuaj, lub cev, thiab kev tswj xyuas tshuab. Cov khoom siv raw zoo sib xws, cov tshuaj tiv thaiv foaming ruaj khov, thiab cov pwm pwm tsim nyog yog qhov tseem ceeb los ua kom cov khoom zoo sib xws thiab kev ua haujlwm, thiab tseem muab kev txhawb nqa rau siab - khoom zoo hauv kev lag luam.
