[Object] To provide a multilayer assembly that excels in pore properties, is flexible, and is satisfactorily handled and processed; and a method of producing the multilayer assembly. [Solving Means] A multilayer assembly includes a base and, arranged on at least one side thereof, a porous layer and has a large number of continuous micropores with an average pore diameter of 0.01 to 10 μm. The multilayer assembly suffers from no interfacial delamination between the base and the porous layer when examined in a tape peeling test according to the following procedure: Tape Peeling Test A 24-mm wide masking tape [Film Masking Tape No. 603 (#25)] supplied by Teraoka Seisakusho Co., Ltd. is applied to a surface of the porous layer of the multilayer assembly and press-bonded thereto with a roller having a diameter of 30 mm and a load of 200 gf to give a sample; and the sample is subjected to a T-peel test with a tensile tester at a peel rate of 50 mm/min.

Porous film and multilayer assembly using the same

Porous polymeric ultrafiltration or microfiltration membranes including Halar (poly (ethylene chlorotrifluoroethylene)) and related compounds and the methods of production thereof which avoid the use of toxic solvents. Preferred solvents, coating agents and pore forming agents are citric acid ethyl ester or glycerol triacetate. The membranes may be in the form of a hollow fibre or flat sheet, and may include other agents to modify the properties of the membrane, such as the hydrophilic / hydrophobic balance. Leachable agents may also be incorporated into the membranes.

Poly(ethylene chlorotrifluoroethylene) membranes

A method of purifying impure water contaminated with a filterable impurity and a dissolved impurity, such as seawater, comprising the steps of: providing impure water to a primary microfiltration or ultrafiltration unit to remove the filterable impurity and produce impure filtered water contaminated with a dissolved impurity; providing the impure filtered water contaminated with a dissolved impurity to a reverse osmosis unit to produce a potable water stream and a residual reverse osmosis stream; and treating the residual reverse osmosis stream prior to reuse. The treatment may be in the form of passing through a secondary filter (such as another microfiltration or ultrafiltration membrane or a cartridge filter, and the subsequently treated reverse osmosis reject may be used to backwash the microfiltration or ultrafiltration unit.

Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis

The invention relates to a membrane bioreactor process combined with an advanced biological sludge digestion process that provides significant improvements in sludge digestion by reducing the costs and resources required for disposing of digested sludge. The offline treatment vessel is used to solubilize the organic material by operating in a very low oxygen environment. Digested process fluid is transferred back to the membrane bioreactor. The processes and apparatus substantially reduce the production of waste sludge.

Filtration apparatus comprising a membrane bioreactor and a treatment vessel for digesting organic materials

A method of cleaning a membrane filtration module (6), the module (6) including at least one membrane (8) located in a feed-containing vessel (7), the membrane (8) having a permeable wall which is subjected to a filtration operation wherein feed containing contaminant matter is applied to one side of the membrane wall and filtrate is withdrawn from the other side of the membrane wall. The method comprising the steps of: suspending the filtration operation; performing a cleaning process on the membrane wall to dislodge contaminant matter therefrom into liquid surrounding the membrane (8); performing a high velocity sweep of the feed-containing vessel (7) to remove the liquid containing the dislodged contaminant matter; and recommencing the filtration operation. An improved gas scouring method is also disclosed.

Method of cleaning membrane modules

PROBLEM TO BE SOLVED: To keep the high sterilization effect for a long period of time and prevent the deterioration of a separating membrane and the permeation performance thereof by preparing a separating membrane preservation liquid from a solution containing sodium bisulfite. SOLUTION: A separating membrane preservation liquid in the wet state used for preserving a separating membrane for separating permeated water by filling a raw water used in the fields of food industry, medical care, purification of water and the like when being not used in prepared from a solution containing sodium sulfite. The sodium sulfite is provided with the high sterilization effect for aerobic bacteria, free from toxicity, keeping its sterilization effect for a long time and not oxidizing a polymer nor deteriorating the separating membrane, by which the permeation performance is not lowered. The concentration of the sodium bisulfite to be used is preferably in the range of 0.01-5%, more preferably 0.02-0.05%. Although no particular restrictions are applied for a solvent, water is best for the purpose in consideration of operation properties, and among other things, sterilized water is preferred most.

Separating membrane preservation liquid and separating membrane module

PROBLEM TO BE SOLVED: To provide a protection sheet for semiconductor wafer processing used for protecting a surface of a pattern-formed semiconductor wafer during a grinding process of its rear, which suppresses warpage of the semiconductor wafer at a low level in reducing its thickness through a back grind process even when the semiconductor wafer has a large size. SOLUTION: The protection sheet for semiconductor wafer processing is provided, which is used for protecting the surface of a pattern-formed semiconductor during a grinding process of its rear. The protection sheet is arranged such that an adhesive layer is stacked on a substrate. The adhesive layer which is to be in contact with the surface of the wafer has a tensile elastic modulus of 0.7 MPa or below at a temperature of 23°C. The substrate consists of a single layer or a multilayer with at least one layer having a tensile elastic modulus of 0.6 GPa or more at a temperature of 23°C. COPYRIGHT: (C)2004,JPO&NCIPI

Protection sheet for semiconductor wafer processing

PROBLEM TO BE SOLVED: To provide a porous membrane with excellent mechanical strength which can be obtained in a practical method by using a mixed solvent having an appropriate solubility formed by mixing a non-solvent to cause a liquid-liquid phase separation, and a production method of the porous membrane. SOLUTION: A production method of a porous membrane comprises cooling a membrane forming solution where a polyvinylidene fluoride resin is at least heated and melted in a solvent at a temperature higher than the phase separation temperature to a temperature not higher than the phase separation temperature to be solidified, wherein the solvent is a mixed solvent formed by mixing a poor solvent defined by the formula (2) and a non-solvent defined by the formula (3) using three-dimensional solubility parameters, and both the solvents satisfy the formula (4) and the mixed solvent satisfies the formula (1). COPYRIGHT: (C)2006,JPO&NCIPI

Porous membrane and its production method

PROBLEM TO BE SOLVED: To provide a hollow fiber membrane module preventing the generation of the membrane damage caused by the vibration displacement of hollow fiber membranes while ensuring high treatment capacity. SOLUTION: The outer periphery of a part of a hollow fiber membrane bundle 2 formed by bundling a large number of hollow yarn membranes is covered with an elastic tube 4 made of rubber or the like and a part of elastic tube 4 is embedded in a fixing part 3 comprising a resin layer and the hollow fiber membrane module is fixed to the fixing part 3 so that the remaining part of the tube 4 is exposed to the interior of a cylindrical case 1. The elastic tube 4 is formed so as to have an inner diameter slightly smaller than the outer diameter of the hollow fiber membrane bundle 2. A hole is formed to the part where the elastic tube 4 is embedded in the fixing part 3. COPYRIGHT: (C)1999,JPO

Hollow fiber membrane module

PROBLEM TO BE SOLVED: To provide an anisotropic conductive film easy to secure insulation performance between adjacent terminals when applying thermo-compression bonding by using it, and excellent in reliability of conductive connection between connecting terminals, and its manufacturing method. SOLUTION: In this anisotropic conductive film wherein a plurality of conduction passages 2 pass through an insulating film 1 in a mutually insulated condition and are disposed in it, the film material 1 is formed by at least impregnating an adhesive resin component in a porous film of a heat resistant resin. COPYRIGHT: (C)2003,JPO

伸治田原

Papers

Separating membrane preservation liquid and separating membrane module

Protection sheet for semiconductor wafer processing

Porous membrane and its production method

Hollow fiber membrane module

Anisotropic conductive film and its manufacturing method

伸治 田原

Papers

Separating membrane preservation liquid and separating membrane module

Protection sheet for semiconductor wafer processing

Porous membrane and its production method

Hollow fiber membrane module

Anisotropic conductive film and its manufacturing method

伸治田原