Lub warpage ntawm PVC board yog vim li cas nyob rau hauv ntau yam. Qhov teeb meem tseem ceeb yog qhov kev ruaj ntseg hauv pem teb tsis tau tswj kom zoo. Txawm hais tias coiled pem teb los yog ntawv hauv pem teb, feem ntau ntawm lawv tshwm nyob rau hauv PVC pem teb nrog puag. Vim muaj kev cuam tshuam ntawm ib puag ncig, cov kev hloov ntawm thermal expansion thiab txias contraction ntawm PVC pem teb yog txawv, ua rau hauv pem teb expansion los yog contraction. Cov kev hloov ntawm thermal expansion thiab txias contraction ntawm cov coefficients sib txawv, yog li hauv pem teb warps. Hauv kev tsim hauv pem teb, kev saib xyuas yuav tsum tau them rau kev siv lub laj thawj thiab sib npaug ntawm cov khoom siv los txo qhov deformation ntawm hauv pem teb.
1. xyuas seb qhov kub ntawm PVC board yog siab dhau thaum demoulding. Yog tias muaj, txo lub chim kub.
2. puas muaj kev deformation los ntawm kev ntxhov siab sab hauv. Yog tias muaj, txo qhov kev txhaj tshuaj.
3. yog qhov hla ntu tsis sib xws thiab qhov shrinkage tsis sib xws. Yog tias muaj, rov tsim cov pwm nrog cov ntu ntu sib xws kom nws ua kom sib npaug.
4. tus pin demoulding tsis sib npaug. Yog tias muaj, kho lossis pov tseg ntawm tus pin tso tawm.
Yog vim li cas rau qhov warping ntawm PVC los xij yog raws li nram no: ua ntej, cov txheej txheem ntau lawm tswj ntawm cov nplooj ntawv tsis nyob rau hauv qhov chaw, thiab cov nplooj ntawv zoo yuav tsum muaj raws li paving ceev thiab symmetrical qauv. Yog tias qhov sib txawv loj dhau, qhov kev nthuav dav sab hauv thiab kev cog lus ntawm lub phaj yuav tsis sib haum, ua rau muaj kev ntxhov siab sab hauv. Qhov thib ob, cov ntsiab lus dej ntawm lub phaj tsis raug tswj kom zoo. Cov dej ntsiab lus ntawm lub phaj siab tshaj los yog qis dua cov av noo, uas yog ib qho yooj yim ua rau warpage thiab deformation. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum khaws cov ntsiab lus ntawm cov dej hauv qhov qub. Thib peb, lub phaj ntom ntom yog tsis tsim nyog. Tsawg phaj ceev yuav ua rau cov txheej txheem nto tsis du thiab yooj yim rau nqus noo noo thiab deform. Plaub, cov dej tsis zoo ntawm lub rooj tsavxwm tsis tsim nyog, thiab nws yooj yim rau nqus dej noo thiab deform. Thib tsib, kev saib xyuas tsis tsim nyog. Yog tias lub rooj tsavxwm PVC tsis khaws cia rau hauv qhov chaw qhuav thiab qhov cua, nws yooj yim los cuam tshuam rau kev ruaj ntseg ntawm lub rooj tsavxwm, ua rau deformation thiab lwm yam teeb meem.
Los ntawm cov neeg kho tshuab qhov pom, qhov warping deformation ntawm cov ntawv hlau yog qhov tshwm sim ntawm kev ntxhov siab sab hauv. Yog tias tsis muaj kev ntsuas nyob rau hauv cov txheej txheem tsim khoom, lub phaj tsis tuaj yeem cuam tshuam qhov kev ntxhov siab sab hauv, ua rau lub warpage thiab deformation ntawm PVC phaj thaum nws yog ua nyob rau hauv siab thiab high humidity.
