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    • 3. 发明授权
    • Fine porous membrane and process for producing the same
    • 细多孔膜及其制造方法
    • US4840733A
    • 1989-06-20
    • US127304
    • 1987-12-02
    • Jun SasakiAtsushi AdachiKyoichi NaruoYukio ShinagawaSumio Ohtani
    • Jun SasakiAtsushi AdachiKyoichi NaruoYukio ShinagawaSumio Ohtani
    • B01D67/00B01D69/02B01D69/06
    • B01D69/06B01D67/0009B01D67/0013B01D67/0016B01D69/02B01D2323/08B01D2323/12B01D2325/022
    • A fine porous membrane having a pore size distribution in the thickness direction and having a layer having a minimum pore size in the interior thereof, wherein the ratio of maximum pore size to the average pore size, each as determined according to ASTM-316-80, is not more than 1.8. The fine porous membrane is produced by a process comprising casting a film-forming solution, comprising a polymer in a solvent having incorporated therein a swelling agent and a non-solvent, on a casting carrier while being in a solution state, directing air having a temperature of from 15.degree. to 60.degree. C. and a relative humidity of from 10 to 80% onto the surface of the cast film at a velocity of from 0.2 to 4 m/sec for a period of from 2 to 17 seconds to cause coacervation of the cast film while controlling the evaporation loss of the solvent from the cast film and the absorption of non-solvent vapors in the air, dipping the case film in a coagulating bath to cause phase separation and coagulation to form a fine porous membrane, and stripping off the membrane from the casting carrier. The fine porous membranes has a low filtration resistance, a great filtration flow rate, a high efficiency in trapping fine particles and bacteria, and a long life.
    • 一种细孔多孔膜,其在厚度方向上具有孔径分布,并且在其内部具有最小孔径的层,其中最大孔径与平均孔径的比值各自根据ASTM-316-80测定 ,不超过1.8。 微细多孔膜是通过以下方法生产的,该方法包括在处于溶液状态的流延载体上将含有溶剂的溶剂中包含聚合物的成膜溶液浇铸在溶液中,引导具有 温度为15〜60℃,相对湿度为10〜80%,以0.2〜4m /秒的速度在流延膜的表面上进行2〜17秒的时间,使凝聚 的流延膜,同时控制溶剂从流延膜的蒸发损失和非溶剂蒸气在空气中的吸收,将壳膜浸入凝固浴中以引起相分离和凝结以形成细多孔膜,以及 从铸造载体剥离膜。 细多孔膜具有低的过滤阻力,大的过滤流速,捕获细颗粒和细菌的高效率和长寿命。
    • 4. 发明授权
    • Filtration system
    • 过滤系统
    • US5221479A
    • 1993-06-22
    • US834801
    • 1992-02-13
    • Masahiro EtohSumio Ohtani
    • Masahiro EtohSumio Ohtani
    • B01D61/14B01D65/02C12H1/07C12N1/02
    • B01D61/147B01D65/02C12H1/063C12N1/02B01D2321/04
    • A dead-end type filtration system wherein a bulk (or bulk suspension) comprising a fluid containing suspended matters is filtered through a micro-filter membrane to separate the fluid form the suspended matters, back wash is periodically carried out under such conditions that pressure on the transmitted fluid side of the filter membrane is higher than pressure on the bulk side thereof, and back wash liquid together with the suspended matters desorbed form the liter membrane is discharged from the filtration system to the outside, characterized by that said filter membrane has an anisotropic structure where the pore diameters of the filter membrane are changed continuously or discontinuously in the thickness direction of the filter membrane, and the pore diameters on one side of the filter membrane are different from those on other side thereof.
    • 一种死端型过滤系统,其中包含含有悬浮物质的流体的本体(或本体悬浮液)通过微过滤膜过滤以从悬浮物中分离出流体,反冲洗在这样的条件下周期性地进行: 过滤膜的透过流体侧高于其主体侧的压力,并且从清洗膜离开的悬浮物与反洗液一起从过滤系统排出到外部,其特征在于,所述过滤膜具有 过滤膜的孔径在过滤膜的厚度方向上连续或不连续地变化,并且过滤膜一侧的孔径与其另一侧的孔径不同的各向异性结构。