Method of forming hollow fiber using multi-angle spinneret

A multi-angle spinneret, comprising:

• a body comprising an upper body coupled to a lower body:
• wherein the lower body comprises:
• a dope chamber having an upper chamber opening and a lower chamber opening;
• a dope outlet connected to the lower chamber opening of the dope chamber;
• and
• wherein the upper body has a truncated triangular cross section flaring from a top end to a bottom end, and wherein the upper body comprises:
• a plurality of dope channels, each comprising a dope channel inlet and a dope channel outlet, each of the dope channels being oriented at a dope channel orientation angle, each dope channel outlet fluidly connected to the dope chamber, the plurality of dope channels comprising:
• a first dope channel having a first dope channel orientation angle of from 90° to greater than 75°,
• a second dope channel having a second dope channel orientation angle of from 52.5° to greater than 37.5°,
• a third dope channel having a third dope channel orientation angle of from 37.5° to 15°,
• wherein the dope channel orientation angles are determined in a range of from 0° to 90° from a horizontal plane defined by a top surface of the lower body that abuts a bottom surface of the bottom end of the upper body;
• a bore needle channel extending from an exterior surface of the top end of the upper body to the upper chamber opening of the dope chamber, the bore needle channel comprising a bore needle connection located at a surface end of the bore needle channel and a bore needle channel termination located at a dope chamber end of the bore needle channel, the bore needle channel being oriented substantially perpendicular to a plane defined by the upper chamber opening of the dope chamber;
• and
• a bore needle comprising a bore fluid inlet and a bore fluid outlet, the bore needle connected to the bore needle connection and disposed in the bore needle channel co-axial to the bore needle channel and extending through the bore needle channel and the dope chamber such that a bore fluid flow through the bore needle is kept separate from a dope flow through the dope chamber;
• and
• the bore fluid outlet is positioned substantially within the dope outlet such that a bore fluid flow out of the bore fluid outlet is substantially coaxial with and substantially centered within a dope flow out of the dope outlet.