Bisa ga abin da aka rufe.bakin kofaza a iya raba iri biyu: wuya hatimi da taushi hatimi.Menene bambanci tsakanin bawul ɗin hatimi mai laushi da bawul ɗin hatimi mai wuya:
Bawul ɗin ƙofar hatimi: Kayan hatimi a kan duka abubuwan rufewa kayan ƙarfe ne, wanda ake kira “hard hatimi”.High zafin jiki juriya, sa juriya, mai kyau inji Properties kamar: karfe + karfe;karfe + jan karfe;karfe
+ Graphite;karfe + gami karfe.Abubuwan da aka saba amfani da su sune: 13Cr bakin karfe, kayan aiki mai wuyar gaske, fesa tungsten carbide, da dai sauransu. The sealing surface ne in mun gwada talauci shãfe haske.
Bawul ɗin ƙofar hatimi mai laushi: hatimin hatimi an yi shi da kayan ƙarfe a gefe ɗaya da kayan roba waɗanda ba ƙarfe ba a gefe guda, wanda ake kira “hatimi mai laushi”.Ayyukan rufewa na irin wannan hatimi yana da kyau, amma ba shi da tsayayya ga yawan zafin jiki, mai sauƙin sawa, kuma yana da ƙananan kayan aikin injiniya.Kamar: karfe + roba;karfe + PTFE, da dai sauransu. Yana nufin cewa gefe ɗaya na hatimi biyu an yi shi da kayan aiki tare da ƙarancin ƙarfi.Gabaɗaya magana, kujerar hatimi mai laushi an yi shi da kayan da ba ƙarfe ba tare da takamaiman ƙarfi, taurin da juriya na zafin jiki.Yana da kyakkyawan aikin rufewa kuma yana iya kaiwa ga zubar da ruwa, amma yana da tsawon rai.Idan aka kwatanta da rashin daidaituwa ga yanayin zafi, hatimin hatimi na ƙarfe an yi shi da ƙarfe, kuma aikin rufewa ba shi da kyau, kodayake wasu masana'antun sun yi iƙirarin cewa zai iya kaiwa ga zubewar sifili.Manufar ƙirƙirar bawul ɗin rufewa mai laushi mai laushi: don magance matsalar wurin zama na bawul da murfin murfin bawul ɗin da aka lalata ko gurɓatacce, farantin bawul na iya ramawa ta atomatik don murfin matsa lamba da ma'aunin atomatik tare da ma'auni ta atomatik Ƙofa mai laushi mai laushi, da kuma magance matsalar matsala mai laushi mai laushi da ke lalacewa ta hanyar rikici Matsalolin da ke rufewa, saboda ana iya maye gurbin hannun rigar ƙofar, yana ƙara yawan amfani da bawul.
Practical kewayon taushi hatimi ƙofar bawul: diamita (p50-p400mm, matsa lamba 2.5-4.0MPa, daban-daban al'ada zazzabi taya kasa da 200 ℃).
Hatimi mai laushi ba zai iya cika ka'idodin tsari don wasu abubuwa masu lalata ba, kuma hatimi mai wuya zai iya magance shi!
Waɗannan nau'ikan hatimi guda biyu na iya haɗawa da juna.Dangane da matsi, hatimi mai laushi yana da kyau sosai, amma yanzu maƙarƙashiyar hatimi mai wuya kuma zai iya biyan bukatun da suka dace!Amfanin hatimin mai laushi shine kyakkyawan aikin hatimi, amma rashin amfani shine cewa yana da sauƙin tsufa, lalacewa, kuma yana da ɗan gajeren rayuwar sabis.Hatimi mai wuya yana da tsawon rayuwar sabis, amma maƙarƙashiya ya fi muni fiye da na hatimi mai laushi.