(DE3325649-C)      Bag-form sepn. element (I) for accumulators is produced by forming a multi-layered sheet as in paper prodn., one layer (A) comprising microporous material contg. filler and another layer (B) comprising porous support material, and these layers are passed between rollers, dried and cut.    The material of layer (A) comprising a mixt. of synthetic fibre material, synthetic pulp material and inorganic material and the material of layer (B) comprising a mixt. of synthetic fibre material and synthetic pulp material but which is free from inorganic material, are combined together, superimposed layerwise, in still wet condition, by a paper prodn. process. The still wet sheet obtd. is heated so that a drying and a bonding of the layers, by melting the synthetic pulp material, is effected.    The resulting sepn. element sheet is so finished that the surfaces of layer (B), facing inwardly for the bag to be produced, are superimposed and on those sections, prescribed by the bag, the cementing envisaged for the bag, of the superimposed layers (B) is effected by thermofusion.    ADVANTAGE -   (I) has min curvature or tendency to form folds.    (8pp)    (US4818340-A)      An envelope type separator for a storage battery is produced by firstly forming a wet microporous paper layer from an aq. slurry of a mixt. of (A) an inorganic powder material, (B) a synthetic organic fibre material and a (C) synthetic organic pulp material. A wet coarse paper layer is formed from an aq. slurry of a mixt. of a material (B) and a material (C) that contains no material (A). The wet microporous paper layer and the wet coarse paper layer are combined together by a paper making process. The resultant combination-paper type wet sheet is heated to effect drying and binding the two paper layers of it together, through fusion of the synthetic pulp materials, thereby producing a combination-paper type separator sheet (I). Sheet (I) is an integral combination of the microporous paper layer contg. material (A), and the coarse paper layer contg. no material (A). The coarse paper layer is comparatively large in pore dia. and thus in porosity. The sheet (I) is arranged so that the mutually inward facing surfaces of the coarse paper layer are placed one upon the other. Finally, the mutually inward facing surfaces of the coarse paper layer are adhered together by melting the synthetic pulp materials by thermal fusion at predetermd. locations of them, so that sheet (I) is formed into the shape of an envelope.    ADVANTAGE -   Separator obtd. is soft and tough and has oxidn.-resisting properties.    (8pp)    (JP92049742-B)      Elements are made of a first microporous layer of an inorganic material, a synthetic fibre material and a binder, and a second layer with synthetic fibre material without inorganic material. The two layers are joined to one sheet by heating. When folded to a bag, the inward facing areas of the second layer contg. no inorganic material are joined to each other by fusion so that the sheet can be formed to the shape of a bag.    Such a separator combines the good oxidn. stability due to the inorganic material with the good thermofusion of the organic material and its greater fold strength. (J59014261-A)