HP-DHK letoto la likarolo tse peli tsa preheating preheating mochini (Invention patent No.: ZL 2009 1 0014580.9) e eketsa katleho ea tlhahiso habeli, e boloka 50% ea motlakase, le 50% ea matsete a lisebelisoa. Ka 2009, e amohetsoe ke China Carbon Industry Association e tsebahalang Shenyang Aluminium Magnesium Design Institute Co., Ltd., Guiyang Aluminium Magnesium Design and Research Institute Co., Ltd., le litsebi tse 'maloa tsa lehae tse tsebahalang tsa khabone ho kenya letsoho tlhahlobong ea katleho ea mahlale le thekenoloji ea provense le bosebeletsi.The double-layer preheating kneader ke ea pele ea mofuta oa eona ho basebetsi ba malapeng le linaheng tse ling, ho fihla boemong bo ka sehloohong ba machaba ba lihlahisoa tse tšoanang.