Method for production of a continuous web of fluid purifier membrane filter stock material having a low pressure side permeable layer sandwiched between two membrane carrier layers having cast-in place external membranes

摘要

In a method for producing a membrane filter for a fluid purifier, wherein the filter includes a pair of membrane layers and a spacer layer placed therebetween, a layer of membrane-forming casting solution is applied to the outer surfaces of a web of fluid-permeable starting material for the membrane layers and the spacer layer. The web- like starting material is passed through a bath so as to gel the casting solution.