What is the spinneret length-diameter ratio? Why is it important?

Spinneret length-diameter ratio refers to the ratio of spinneret length to inner diameter. A common spinneret length-to-diameter ratio is between 4:1 and 6:1. The size of length-diameter ratio of spinneret will affect the diameter, quality and properties of fiber. In addition, too small aspect ratio will affect the flow of the polymer during the spinning process, thus affecting the formation and properties of the fiber.