油圧の不一致: ローエンドの機械では、圧力が漏れる基本的な手動バルブが使用されています。 This results in blocks with uneven density—the top of the block might be hard, but the bottom remains crumbly, leading to high rejection rates and wasted cement. (Source: Analysis based on "Common Failures in Small-Scale Manufacturing Equipment in Sub-Saharan Africa" and ZCJK's 20+ years of field maintenance data in West Africa.)