How felt-tip markers are made
A marker's felt tip is usually not felt at all. It is a bundle of plastic fibers bonded where they touch.
- stations
- 7
- things upstream
- 48
- raw sources
- 16
- steps from the ground
- 8
The short version
Felt-tip markers hold their ink in a soft rod of bonded polyester fibers sealed inside a plastic barrel. A tip of tightly packed synthetic fibers touches that rod and draws ink out by capillary action, the same pull that lifts water up a paper towel. Ink is dosed into the rod, the tip and cap are fitted, and each marker is test-written.
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Spin two-layer fibers
Molten polymer is blown through fine nozzles into fibers that have a core of one plastic and a sheath of polyester around it. Its sheath softens at a lower temperature than the core.
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Heat-bond porous rods
Gathered into a rod and heated, the fibers fuse wherever their sheaths cross. The result is a long rod full of tiny connected channels, which is cut to length for ink reservoirs and tips.
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Grind the tips
Short pieces of the denser rod are cut or ground to a bullet point or a chisel edge. Older permanent markers used polyester felt hardened with phenolic resin instead.
Goes in -
Mold barrels and caps
Barrels, plugs and caps are injection molded from plastic. A snug cap keeps the solvent from evaporating out through the tip.
Goes in -
Mix the ink
Dye or pigment is dissolved in an alcohol-based solvent with a resin for grip. Permanent ink once relied on toluene and xylene, and most markers now use milder alcohols, while dry-erase ink adds a release agent so it wipes off glass and enamel.
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Fill the reservoir
Workers push the fiber rod into the barrel and inject a measured dose of ink that soaks through it. Last, the tip is pressed into the open end so it touches the soaked rod.
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Cap and test-write
The back plug and cap go on, and samples are drawn across paper to check ink flow and line width. In one industry test, a marker stored tip up for 48 hours must write by its third stroke.
48 hours tip up
Worth repeating
- Sidney Rosenthal's Magic Marker of 1953 was a glass tube of ink with a felt wick.
- Election markers carry an indelible dye that stains a voter's finger for a week or two to prevent double voting.
- Permanent marker ink is not permanent on plastics like polypropylene and Teflon and can be rubbed off them.
Back to the ground
Follow every input upstream and felt-tip marker starts as these 16 raw sources.
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Sources
- Marker pen
- Permanent marker
- US6840692B2 - Method and apparatus for making nibs and ink reservoirs for writing and marking instruments
- US4733586A - Method of and apparatus for making a capillary-action nib for a pen or marker
Cite this page: "How felt-tip markers are made." Assembly Line, 2026-11-03. https://assemblyline.org/make/marker