초록 ▼

An assembly of fibers composed of at least two dissimilar fiber-forming polymers, characterized by the fact that (1) it consists of numerous fibers, (2) at least 90% of said fibers have a non-circular cross-sectional shape, (3) the cross-sections of at least 50% of said fibers differ from each other

An assembly of fibers composed of at least two dissimilar fiber-forming polymers, characterized by the fact that (1) it consists of numerous fibers, (2) at least 90% of said fibers have a non-circular cross-sectional shape, (3) the cross-sections of at least 50% of said fibers differ from each other in at least one of shape and size, and (4) at least 50% of said fibers each have in their cross-section taken at right angles to the fiber axis at least two side-by-side coalesced blocks of at least two dissimilar fiber-forming polymer phases with at least a part thereof being exposed to the peripheral surface of the fiber, at least one of the number, shape and size of the blocks varying from fiber to fiber. The assembly of fibers can be produced by extruding a molten macroblend composed of many molten phases of at least two dissimilar fiber-forming polymers through a mesh spinneret having many small openings; and taking up the extrudates from the small openings while cooling them by supplying a cooling fluid to the extrusion surface of said spinneret or to its neighborhood, whereby said extrudates are converted into numerous separated fine fibrous streams and solidified.

대표청구항 ▼

A process for producing an assembly of many fibers, which comprises: (1) extruding a molten macroblend composed of many molten phases of at least two dissimilar fiber-forming polymers through a mesh spinneret, said mesh spinneret having many small openings defined by partitioning members of small wi

A process for producing an assembly of many fibers, which comprises: (1) extruding a molten macroblend composed of many molten phases of at least two dissimilar fiber-forming polymers through a mesh spinneret, said mesh spinneret having many small openings defined by partitioning members of small width having elevations and depressions on at least one surface thereof and having an opening area ratio of 0.1 to 0.8, the function of said small openings being that the polymer melt extruded through one small opening of the spinneret can move toward and away from the polymer melt extruded from another small opening adjacent to said one opening or vice versa through depressions of the partitioning members, the elevated and depressed surface of the spinneret being a polymer extruding side, and said molten macroblend to be extruded having a phantom cross-section taken parallel to the spinneret, in which there exist many effective continuous boundary lines between the molten phases of dissimilar polymers each of which lines has a length larger than one-fourth of the length of a partitioning member which defines one small opening in the spinneret, whereby said many boundary lines are cut with the partitioning members in the spinneret, and (2) taking up the extrudates from the small openings while cooling them by supplying a cooling fluid to the extrusion surface of said spinneret or to its neighborhood, whereby said extrudates are converted into numerous separated fine fibrous streams and solidified.