Muaj ntau ntau yam laj thawj vim li cas polyurethane ua npuas ncauj yog yooj yim rau shrink:
1. Muaj ntau ntau cov ntaub ntawv nyob rau hauv pawg A, uas txo lub zog ntawm cov nplaum thiab ua rau ib tug loj shrinkage.
2. Cov ntaub ntawv hauv rab phom tsis sib npaug, ua rau me me heev los yog muaj viscosity siab dhau.
3. Lub curing ceev yog ceev heev, ua rau feem ntau npuas tshwm nyob rau hauv lub kaw-cell xeev.
4. Ua haujlwm ntawm qhov kub tsis tshua muaj qhov ncaj qha ua rau cov npuas dej ntsws.
Muaj ntau qhov laj thawj vim li cas polyurethane ua npuas ncauj tsis ua npuas dej kom zoo:
1. Qhov kub ntawm cov khoom yog tsawg dhau, los yog tus neeg sawv cev foaming thiab catalyst tsis ntxiv.
2. Qhov piv ntawm ob pawg ntawm cov ntaub ntawv tsis yog kev tshawb fawb, ua rau cov nplaum tsis foaming ib txwm. Los yog muaj teeb meem nrog qhov zoo ntawm cov nplaum thiab nws tsis tuaj yeem siv ib txwm.
3. Qhov kub thiab txias ambient siab dhau los yog qis dhau, cuam tshuam rau cov tshuaj tiv thaiv ceev thiab sib npaug kub.
4. Lub thickness thiab lub zog ntawm lub plhaub tsis txaus, thiab tsis tuaj yeem txhawb nqa lub ntim hloov ntawm cov npuas dej.
Txhawm rau daws cov teeb meem no, nws yog ib qho tsim nyog yuav tsum tau kho cov qauv, txheej txheem, khoom siv thiab ib puag ncig raws li qhov xwm txheej tiag tiag kom ua tiav cov txiaj ntsig zoo tshaj plaws foaming.