Process for producing fibrous assembly

A process for producing a fibrous assembly by extruding at least one fiber-forming polymer through a spinneret having numerous small openings, said process comprising using a die equipped with a spinneret having numerous closely spaced small openings having an opening ratio (.alpha.), defined by the following equation, of at least 30%, ##EQU9## wherein V.sub.a (cm.sup.3) is the total apparent volume of the spinneret which is taken within 1 cm.sup.2 of the porous portion of the spinneret and V.sub.f (cm.sup.3) is the total volume of partitioning members defining the small openings which is taken within 1 cm.sup.2 of the porous portion of the spinneret;

• continuously stuffing at least one fiber-forming polymer in the form of a shaped mass into said die, said shaped mass having compression resistance such that at least in the initial stage of its stuffing into the die, it substantially retains its form in resistance to the stuffing pressure, and said shaped mass having such a shape that it measures more in one direction than in another;
• passing through the spinneret an electric current sufficient to give said fiber-forming polymer Joule heat required for cutting said polymer by partitioning members defining the numerous small openings of the spinneret;
• and taking up the cut fiber-forming polymer as fine streams.