xov xwm

Cov duab los qhia bulges rau hauv kev nyuaj siab nyob rau hauv ib cheeb tsam loj, uas yog hu ua warping.

Kev tsim ntawm cardboard warpage yog ntau dua:
Muaj "zoo" warpage, tseem hu ua "upward warpage", uas txhais tau hais tias cov duab los qhia bulges mus rau sab ntawm daim ntaub so ntswg.
Qhov opposite yog "rov qab" warpage.
Ib sab yog convex thiab lwm sab yog concave, uas yog "S-shaped warping".Lub warping yog tsim los ntawm kev noj cov kab pheeb ces kaum ntawm cov duab los qhia ua lub axis los ua "twisted warping", los yog hu ua "corrugated warping".
Lub warping axis yog parallel mus rau corrugated kev taw qhia, uas yog hu ua "ntev kev taw qhia" warping.Tsuas yog rau pem hauv ntej warpage, lwm hom warpage yog tsawg.

Siv warped cardboard los ua cov thawv, qhov saum npoo ntawm lub thawv tsis zoo, thiab cov duab tsis tuaj yeem yog square, uas cuam tshuam rau cov tsos.Vim yog qhov tsis sib xws ntawm lub thawv, nws yog ib qho yooj yim kom poob kev ruaj ntseg thaum raug quab yuam, uas txo cov compressive tsis kam ntawm lub thawv.Lub warped cardboard tsis yooj yim rau sau, thiab kev ua haujlwm tsis zoo, thiab nws tsis tuaj yeem nkag mus rau lub tshuab luam ntawv slotting smoothly, uas cuam tshuam rau kev luam ntawv thiab qhov tseeb ntawm slotting.

Qhov laj thawj tseem ceeb rau kev ua tsov rog ntawm daim duab los qhia yog qhov tsis txaus ntawm daim ntawv zoo: qhov sib txawv ntawm qhov nthuav dav thiab kev cog lus ntawm ntau yam khoom ntawm cov duab los qhia.

Cov dej ntsiab lus ntawm daim ntawv yog txawv, thiab cov nplej sib txawv nyob rau hauv txoj kab ntsug thiab kab rov tav, thiab cov degree ntawm shrinkage kuj txawv.

Thaum daim ntawv rov qab (lub ntsej muag thiab sab hauv) ntawm ob sab ntawm daim duab los qhia sib txawv hauv kev nthuav dav thiab kev cog lus, nws yooj yim ua rau cov duab los qhia.Piv nrog rau daim ntawv nyias thiab me me, kev siv cov ntawv tuab thiab hnyav muaj qhov ruaj khov ntawm kev nthuav dav thiab tsawg deformation.Yog li ntawd, thaum lub thickness los yog qhov hnyav ntawm daim ntawv lub ntsej muag thiab cov ntawv sab hauv yog txawv, cov duab los qhia yuav ua rau warp.Yog li ntawd, thaum sib piv cov ntawv hauv thawv tsim los yog ntau lawm, grammage thiab zoo ntawm cov ntaub so ntswg yuav tsum sib npaug los yog ze.

Vim tias qhov sib txawv fiber ntau cov lus qhia ntawm daim ntawv, thaum rhuab, nws transverse shrinkage yog ob zaug loj li nws longitudinal shrinkage.Yog li ntawd, thaum sib xyaw cov ntawv hauv kev tsim khoom, cov kev taw qhia fiber ntau ntawm qhov chaw thiab cov ntawv sab hauv yuav tsum zoo ib yam los txo qhov warpage ntawm cov duab los qhia.

Ntawm lub tshuab corrugated board, daim ntawv tsis tuaj yeem ntsws vim yog traction raws qhov ntev ntawm daim duab los qhia, tab sis lub lateral shrinkage ntawm daim ntawv tsis tuaj yeem tswj tau.Qhov no yog lwm qhov laj thawj tseem ceeb ntawm "kev ua tsov rog zoo".

Hauv kev tsim khoom, lub shrinkage thiab deformation ntawm daim ntawv tuaj yeem tswj tau los ntawm kev kho cov cua sov kom txo tau qhov warpage ntawm cov duab los qhia.

Qhov laj thawj ntawm "kev ua tsov rog pem hauv ntej" feem ntau yog cov ntaub ntawv hauv ob sab phlu thiab cov corrugation nkaus xwb, thiab cov ntawv saum npoo yog qhuav dhau.Yog li ntawd, qhov ziab ntawm cov ntaub ntawv hauv ob sab phlu thiab ib qho corrugation yuav tsum tau nce ntxiv kom txo tau cov preheating ntawm cov ntaub ntawv sab nraud.Piv txwv li, ua kom lub tshav kub ntawm cov ntawv corrugated thiab cov ntaub ntawv hauv ob sab phlu rau ntawm ib lub ntsej muag, txo qhov kub ntawm lub phaj kub ntawm lub tshuab cladding, txo tus naj npawb ntawm lub ntiajteb txawj nqus chais, thiab tsim nyog ua kom lub tsheb ceev kom txo tau cov cua sov. hloov.Thaum nres tsheb, koj yuav tsum nqa cov duab los qhia kom deb ntawm lub phaj kub, los yog tshuaj tsuag daim ntawv ntawm lub ntsej muag, hloov mus rau cov nplaum nplaum uas muaj kuab heev thiab muaj viscosity, thiab txo cov kua nplaum.

Yog vim li cas rau "rov qab sab warping" tsuas yog qhov opposite ntawm cov saum toj no, vim hais tias ib leeg-sided corrugation yog qhuav heev thiab cov ntaub so ntswg ntub dej heev.Yog li ntawd, txoj kev tawm tsam yuav tsum tau coj los tswj.

S-hom warpage feem ntau txhais tau hais tias cov npoo ntawm daim ntawv yog ntub dhau thiab cov ntawv hauv paus shrinks hnyav.Muaj peev xwm nce lub sij hawm preheating ntawm daim ntawv.Nws kuj yuav yog vim li cas vim li cas cov khoom siv ntawm sab saud thiab sab saud yog qhov sib txawv heev.

Qhov ua rau distortion thiab warping yog: qhov nro ntawm ib sab corrugated los ntawm tus choj loj heev;qhov zoo ntawm cov ntawv hauv paus tsis zoo;qhov kub thiab txias ntawm cov phaj kub tsis sib npaug, thiab cov dej noo ntawm cov ntawv hauv paus tsis sib xws.


Post lub sij hawm: Nov-25-2021