The raw polyester material is subjected to preliminary consolidation through needling and is subsequently consolidated by means of an embossing calender and shrunk. The shrunk and consolidated nonwoven is assembled into a sleeve, which is equipped with a b...

Surprisingly it has been found that battery separators based on unwoven fabric can be obtained simply and without complications and having uniform thickness and especially adequate porosity. The separators are not hairy, have outstanding mechanical strengt...