To investigate tensile breaking factors and preventive methods on the polyamide monofilament line, the
circularity and tensile strength were measured. We found out that the circularity is dispersive along the line,
which lower the tensile strength and cause the line breaking by the stress concentration.
When polyamide monofilament line is bent on swivel, tensile strength decreased as the decreasing of cross
section area. We examined the tensile breaking factors theoretically, and then discussed some preventive methods
of tensile breaking, i. e. vinyl tube, tapered polyamide monofilament, preventive frames installing on swivel and
casting polyamide monofilament. The casting polyamide monofilament has special cross section, wears resisting
and against damage, so it is suitable for the fishing operation.
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