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问:半干压瓦如何消除分层现象?答:粘土瓦的成型工艺有塑性成型、半干压成型和半硬塑挤出成型3种.由于湿法模压制瓦成型的瓦坯(将挤泥机挤出的泥片在压瓦机上压制成型)含水率较高,给生产带来一定困难.半干压成型则甩掉瓦托板,节约大量木材,降低成本,降低了劳动强度和成型含水率,减化了干燥工序,缩短了干燥周期,但控制不当也会出现一些问题,瓦坯内部分层即是其最常见的缺陷.瓦坯分层的实质是坯包气.瓦坯原料在被压制的过程中,空气没有及时地被全部排出,仍有部分来不及排出的空气滞留在瓦坯中,集中一处或多处使瓦坯分层起包,有时明显有时不明显,使出窑后的成品吸水率高,声音低哑,质量降低.
Q: How does the semi-dry pressure tile eliminate stratification? A: There are three types of plastic tile forming processes: plastic molding, semi-dry compression molding and semi-hard plastic extrusion molding. Mud-extinguishing mud chips are pressed on a tile press.) The moisture content is high, which brings certain difficulties to production. The semi-dry-press molding removes the watts plate, saves a lot of wood, reduces the cost, and reduces labor intensity and molding. Moisture content reduces the drying process and shortens the drying cycle. However, some problems may arise due to improper control. The internal delamination of the billet is the most common defect. The essence of the slab delamination is the billet gas. In the process of being suppressed, the air is not completely discharged in a timely manner. There is still part of the exhausted air that remains in the billet. Concentrating on one or more places to make the billet layered and layered, sometimes it is obvious and sometimes not obvious. The finished product after kiln has high water absorption, low sound and low quality.