1. Lub qhov rooj nkag: nws ncua kev pub rau sab nraud ntawm qhov khoom, thiab nws qhov chaw pub mis yog symmetrical, thiab pwm txhaws yog hom, uas tuaj yeem tua cov kab txuas tsev thiab pab txhawb qaug.
2.Fan rooj vag: maj mam ntxiv ntawm cov kab xev ntawm cov kab noj hniav, uas yog tsim rau cov khoom ntev lossis cov khoom siv nyias, uas tuaj yeem txo txoj kev khiav thiab kev nyuaj siab.
3. Lub rooj vag loj: kom ntev tag nrho ntawm qhov khoom ntawm qhov khoom rau hauv kua nplaum, nws tuaj yeem ua kom lub hnab yas qhwv tus cag kom sib npaug, ua kom zoo, txo txoj kab txuas.
4. Lub rooj laj kab thaiv npoo: qhov chaw sib tshooj hauv seem ntawm lub qhov rooj ntawm rab koob, feem ntau yog siv rau kev zoo ntawm cov yas, lub qhov rooj ntev ntev feem ntau tsis yog ntau tshaj nws txoj kab, ces lub qhov rooj tom qab txiav luam yeeb tau txiav tawm, nws tuaj yeem ua pwm rau ua rau lub ntsej muag, qhov yooj yim rau shuikou demoulding.Its kho raws yog qhov me me rau hauv lub qhov rooj ntawm qhov kev poob siab, ua rau qee lub sij hawm tshuaj moulding (ntws cim, hlawv, dub pob zeb) nws cov pob zeb diamond, taw tes rooj vag yog: ob point, multipoint shape, yam.
5.Qhov rooj vag: feem ntau qhib rau ntawm lub pwm, qhov ntom ntom yog tawm ntawm sab hauv los yog sab nrauv ntawm cov kua nplaum, qhov khej seem yog rectangular, haum rau ntau lub qhov.
6. Txhob nkag siab: ncaj qha los ntawm cov ntsiab lus tseem ceeb hauv cov kab noj hniav, tsim kom muaj kab noj hniav sib sib zog nqus plhaub, kem pwm.Qhov kev khiav qis yog luv, lub siab poob qis dua, nws yog kev lim dej, tab sis lub qhov rooj tshem tawm yog phim, yuav tawm ntawm qhov pom kev.
7. Lub qhov rooj nkag lub tsho: nws lub qhov rooj nkag mus rau sab nraub ntawm sab npoo. Nws tuaj yeem hla lub qhov rooj taw koob lub iav thaum qhov khoom muag sab hauv lossis sab hauv ntawm qhov khoom, thiab nws yog tsim rau kev siv khoom tuaj.