Teijin Aramid B.v.

Michiel Jan Adriaan Jaarsveld

Leonardus Antonius Godfried Busscher

Theodorus Hendrikus Van Workum

A spinneret is used to reduce filament breakage during spinning of multifilament yarn being stretched at a high stretch ratio. The spinneret has a first group of spinning holes with capillaries and a second group of spinning holes with capillaries. The capillaries of the second group of spinning holes have a lower length to diameter (L/D) ratio than the capillaries of the first group of spinning holes. All of the capillaries have the same diameter, which is 100 &#x3bc;m or less.

Process for spinning multifilament yarn

A process for producing a plurality of high strength, high modulus aromatic polyamide filaments that includes extruding an acid solution containing at least 15% by weight of an aromatic polyamide through linearly arranged orifices in a spinneret to provide a warp of filaments, passing the warp of filaments through a layer of non-coagulating fluid into a coagulation bath and subsequently passing the warp through a spin tube, the spin tube having an elongated cross section with at least two opposite sides being parallel to the filament warp with the length of these sides being at least as long as the width of the filament warp, jetting additional coagulating liquid at a constant flow rate about the filaments in a downward direction at an angle between 15&#xb0; and 75&#xb0; with respect to the filaments, the jetted coagulating liquid moving downward with the warp of filaments through the spin tube at a velocity of about 50% to 100% of the velocity of the filaments, the coagulating liquid being jetted through a jet channel from either one side of the spin tube which is parallel to the filament warp, and the jet channel having at least the same width as the filament warp.

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Utrecht, Netherlands

Michiel Jan Adriaan Jaarsveld