How Is Fishing Line Made?

How Is Fishing Line Made?
Monofilament fishing line is a popular choice for many anglers because it is affordable, dependable and readily available. This trusty, nylon-based filament comes in many line sizes and colors.

Nylon Pellets

Monofilament fishing lines start as small pellets. Manufacturing engineers mix various types of nylon polymer pellets to achieve the performance characteristics required by anglers. Once the correct amount of pellets are mixed, they are ready to be heated.

Melting the Pellets

The nylon polymer pellets are heated in a holding bin until they are melted together; at this point, the mixture is ready to be extruded into its next form.


The melted polymer mixture is extruded through a die that forms the shape and size of the line. Different-size dies produce different line diameters.

Spooling the Line

As the line comes off the extrusion machine, it is spun onto a waiting spool, where a machine counts the exact number of yards in order to fill the spool properly.


As with all manufacturing processes, the line is checked periodically during the process to ensure the end product meets the requirements of the finished product. Once approved, the spools of line are packaged and shipped to a retailer for sale.

Article Written By Brian M. Kelly

Brian M. Kelly has been freelance writing since 2003. His work has been published in respected outdoor magazines such as Outdoor Life, Great Lakes Angler and Salmon Trout Steelheader. He holds an associate's degree in automated machine design from Macomb College.

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