The Rope Library

1. Cellulose: Production begins with processed cellulose
2. Immersion: The cellulose is dissolved in caustic soda: (C₆H₁₀O₅)_n + nNaOH ---> (C₆H₉O₄ONa)_n + nH₂O
3. Pressing: The solution is then pressed between rollers to remove excess liquid
4. White Crumb: The pressed sheets are crumbled or shredded to produce what is known as "white crumb"
5. Aging: The "white crumb" aged through exposure to oxygen
6. Xanthation: The aged "white crumb" is mixed with carbon disulfide in a process known as Xanthation, the aged alkali cellulose crumbs are placed in vats and are allowed to react with carbon disulfide under controlled temperature (20 to 30°C) to form cellulose xanthate: (C₆H₉O₄ONa)_n + nCS₂ ---> (C₆H₉O₄O-SC-SNa)_n
7. Yellow Crumb: Xanthation changes the chemical makeup of the cellulose mixture and the resulting product is now called "yellow crumb"
8. Viscose: The "yellow crumb" is dissolved in a caustic solution to form viscose
9. Ripening: The viscose is set to stand for a period of time, allowing it to ripen: (C₆H₉O₄O-SC-SNa)_n + nH₂O ---> (C₆H₁₀O₅)_n + nCS₂ + nNaOH
10. Filtering: After ripening, the viscose is filtered to remove any undissolved particles
11. Degassing: Any bubbles of air are pressed from the viscose in a degassing process
12. Extruding: The viscose solution is extruded through a spinneret, which resembles a shower head with many small holes
13. Acid Bath: As the viscose exits the spinneret, it lands in a bath of sulfuric acid, resulting in the formation of rayon filaments: (C₆H₉O₄O-SC-SNa)_n + ½nH₂SO₄ ---> (C₆H₁₀O₅)_n + nCS₂ + ½nNa₂SO₄
14. Drawing: The rayon filaments are stretched, known as drawing, to straighten out the fibers
15. Washing: The fibers are then washed to remove any residual chemicals
16. Cutting: If filament fibers are desired the process ends here. The filaments are cut down when producing staple fibers

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