纯水制备工艺中的终端混合床一般采用布水帽或锦纶网布作为布水滤网。由于布水帽的缝隙或网布的孔径为0.15—0.3μm,离子交换树脂的碎屑等颗粒时有逸出,混合床出水中的颗粒粒径可达数十微米。对于在后级没有采用膜过滤、超过滤等装置的情况下,会影响清洗的效果。为此我们采用多孔聚乙烯过滤板(PE 板)来代替通常使用的网布。因为这种板料具有一定的机械强度,可 The terminal mixed bed in the pure water preparation process generally uses a cloth cap or a nylon mesh as a cloth water filter. Since the gap of the cloth cap or the pore size of the mesh cloth is 0.15-0.3 μm, the particles of the ion exchange resin and the like can escape, and the particle size of the particles in the mixed bed effluent can reach several tens of micrometers. For the case where no membrane filtration, ultrafiltration or other devices are used in the later stage, the cleaning effect will be affected. For this purpose, we use porous polyethylene filter plates (PE plates) instead of the commonly used mesh. Because this kind of sheet has a certain mechanical strength, it can be