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How do you get a polyamide or Nylon thread?

Polyamide is a synthetic fiber that is used today for many applications, but many do not know how it is manufactured and a polyamide thread is achieved.

Polyamide is a very useful fibre that is currently used for many applications and sectors, such as sportswear of the highest quality, women's hosiery and in the aeronautics and automotive sectors, all thanks to the performance offered by this fibre.

Polyamide is the favorite of many manufacturers of sewing, as it gives greater durability to clothing, thanks to the properties of the material, but this material is mostly used in sportswear because it is very resistant, comfortable and versatile, so it gives the athlete a very efficient garment for their high-intensity activities.

Today is used to create any garment that goes to fashion, because it is multifunctional because you can make socks, coats, dresses, T-shirts ..., also used for the interiors of cars, airplanes, motorcycle seats, even for the sofas of your own home.

History of polyamide

This fiber was discovered by Dr. Wallace Hume Carothers, while working for the firm E.I Du Pont.

The firm Du Pont gave the doctor the most qualified team he could offer and total freedom to organize all the research he proposed to do, Carothers was fascinated by polymers so he was very passionate about all his work.

And around 1933 Naylon, the synthetic polyamide we know today, was discovered. From this discovery they were realizing several types of fibers like the PA6.6, the most known and used, it is not prepared with acid and amine like the others, but in this case they use dissolutions of the amine and they mix it with chloride of the diàcido.

How is a polyamide or nylon thread produced?

After all the attempts of DuPont's company and many more companies and scientists trying to extract the solution, they came to manufacture the first polyamide filaments by extruding a continuous filament through a nozzle, and then it is cut being necessary to undergo polycondensation, a series of chemical transformations.

They are 4 fundamental stages for the creation of polyamide.

  1. Nylon salt is obtained.
  2. A viscous solution is prepared as a syrup: polymerization
  3. The fibre is formed by extruding this solution by a nozzle or row: melting state.
  4. The fibre is solidified by coagulation, cooling or evaporation.

(The most commonly used process is creation by melting and solidification by cooling.)

Polyamide can be obtained in different forms once the viscous solution has been extruded:


  • Multifilaments: when all the extruded filaments are joined in one.
  • Textured: The smooth filaments are curled a little so that they have a greater elasticity effect.
  • Cut fibres: the filament, whether curly or smooth, is cut into staple fibres, as if it were cotton or wool, for subsequent mixing in the form of a thread.

After obtaining the type of polyamide that is desired, the finish is made, such as dulling, colour dyeing or bleaching and polishing agents.