Cov tsheb npav txoj kev yog cov khoom siv uas siv cov cim rau ntawm txoj kev, xws li kab, xub, cim, thiab lwm yam. Lawv yog siv rau kev taw qhia tsheb, kev nyab xeeb, thiab kho kom zoo nkauj.Txoj kev npav tshuab tuaj yeem siv cov khoom siv sib txawv, xws li thermoplastic, xim txias, yas txias, thiab lwm yam. Nyob ntawm cov khoom siv thiab cov txheej txheem siv, cov kab tuab tuaj yeem sib txawv ntawm 1 hli mus rau 4 hli lossis ntau dua.

Ib qho ntawm cov laj thawj uas cuam tshuam rau kab thickness yog lub thawv screed lossis tuag.Qhov no yog ib feem ntawm lub tshuab uas tsim cov khoom rau hauv ib txoj kab raws li nws yog extruded los ntawm lub hwj los yog lub tank.Lub thawv screed lossis tuag muaj qhov qhib uas txiav txim siab qhov dav thiab qhov tuab ntawm kab.Los ntawm kev kho qhov qhib loj, cov kab tuab tuaj yeem hloov pauv.Piv txwv li, qhov qhib me me yuav tsim cov kab nyias nyias, thaum lub qhov qhib loj dua yuav tsim cov kab tuab dua.

Lwm yam uas cuam tshuam rau txoj kab thickness yog qhov ceev ntawm lub tshuab.Lub tshuab txav nrawm dua, cov kab yuav thinner, thiab vice versa.Qhov no yog vim hais tias cov khoom ntws tus nqi yog tas mus li, tab sis qhov kev ncua deb ntawm lub tshuab nyob rau hauv ib chav tsev lub sij hawm yog sib txawv.Piv txwv li, yog tias lub tshuab txav ntawm 10 km / h thiab siv 10 kg ntawm cov khoom ib feeb, cov kab tuab yuav txawv ntawm thaum nws txav ntawm 5 km / h thiab siv tib yam khoom ib feeb.

Ib qho thib peb uas cuam tshuam rau kab thickness yog qhov kub ntawm cov khoom.Qhov kub thiab txias cuam tshuam rau viscosity thiab fluidity ntawm cov khoom, uas nyob rau hauv lem cuam tshuam li cas nws kis ntawm txoj kev nto.Piv txwv li, cov khoom siv thermoplastic yuav tsum tau rhuab mus rau qhov kub siab (kwv yees li 200 ° C) kom ua kua thiab ntws zoo los ntawm lub thawv screed lossis tuag.Yog tias qhov kub thiab txias qis dhau, cov khoom yuav tuab heev thiab nyuaj rau extrude, ua rau cov kab tuab thiab tsis sib xws.Yog tias qhov kub thiab txias dhau lawm, cov khoom siv yuav nyias nyias thiab ntws, ua rau cov kab nyias nyias thiab tsis sib xws.

Txhawm rau txiav txim siab, txoj kev npav tshuab tuaj yeem kho cov kab tuab los ntawm kev hloov lub thawv screed lossis tuag qhib qhov loj, qhov ceev ntawm lub tshuab, thiab qhov kub ntawm cov khoom.Cov yam tseem ceeb no yuav tsum sib npaug thiab ntsuas raws li qhov tshwj xeeb thiab cov kev xav tau ntawm txhua qhov haujlwm.