劈(pi)開磚(zhuan)又(you)名劈(pi)離磚(zhuan),也可稱為(wei)劈(pi)裂磚(zhuan),是陶(tao)瓷(ci)墻地磚(zhuan)的(de)一種(zhong)(zhong)。劈(pi)開磚(zhuan)通(tong)俗(su)點說就是陶(tao)瓷(ci)坯(pi)(pi)體(ti)(ti)磚(zhuan),一般以各種(zhong)(zhong)粘土或配以長(chang)石等(deng)制陶(tao)原料(liao),經干法粉碎加水或濕法球(qiu)磨(mo)壓(ya)濾(lv)后,制成(cheng)含(han)水濕坯(pi)(pi)泥(ni),再以裝有中空模具的(de)真(zhen)空螺旋擠出機,擠出成(cheng)為(wei)由扁薄的(de)筋(jin)條將兩(liang)(liang)片磚(zhuan)坯(pi)(pi)連結為(wei)一體(ti)(ti)的(de)中空坯(pi)(pi)體(ti)(ti),再經切(qie)割干燥后燒成(cheng),然后以人工或機器沿(yan)筋(jin)條連結處劈(pi)開為(wei)兩(liang)(liang)片產品,故(gu)名劈(pi)開磚(zhuan)。
劈開磚(zhuan)按表(biao)(biao)面(mian)(mian)的光滑程度(du)分,可分為平面(mian)(mian)磚(zhuan)和拉毛(mao)磚(zhuan),前者表(biao)(biao)面(mian)(mian)細膩光滑,后者是在坯料(liao)中(zhong)加(jia)入顆粒料(liao)并(bing)在模具出口安(an)裝(zhuang)細鋼絲(si)對磚(zhuan)坯表(biao)(biao)面(mian)(mian)進(jin)行剖割而成,產(chan)品(pin)表(biao)(biao)面(mian)(mian)布滿粗顆粒或凹坑,從而使產(chan)品(pin)表(biao)(biao)面(mian)(mian)獲得粗糙(cao)的裝(zhuang)飾效果。