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微孔滤膜是以筛作用为主要过滤机理的薄层过滤介质,是用高分子材料制成的。目前国内最常用的有醋酸纤维素微孔薄膜和混合纤维素薄膜。薄膜上分布有比较均匀的微孔,孔径有0.2μm、0.3μm、0.45μm、0.65μm、0.8μm等十几种,滤膜厚度为90-150μm,微孔总面积相当于薄膜总面积的80～85％,由于它孔隙率高,滤膜极薄,所以,微孔滤膜具有阻力小,滤速快,吸附有效物质少,能除去细菌及很小的微粒,以及没有脱屑污染滤液等一系倒优点。同时,薄膜成本低,能耐受高温热压灭菌(121℃kg/cm~2)所以处理使用方便,它对酸碱具有一定的耐受性,可适用于pH3～10范围内使
Microporous membrane is a filtration mechanism of the main filter media as a thin layer of filter media, is made of polymer materials. At present, the most commonly used cellulose acetate microporous film and mixed cellulose film. The membrane has uniformly distributed micropores with diameters of 0.2μm, 0.3μm, 0.45μm, 0.65μm and 0.8μm, etc. The membrane thickness is 90-150μm. The total micropore area is equal to 80% of the total membrane area ~ 85%, because of its high porosity, the membrane is extremely thin, so the microporous membrane has a small resistance, fast filtration, less effective adsorption material, can remove bacteria and small particles, and no desquamation and pollution of the filtrate A series of advantages. At the same time, the film is low cost, can withstand high temperature autoclaving (121 ℃ kg / cm ~ 2) so easy to handle, it has some resistance to acid, can be applied to the pH range of 3 to 10