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How are man-made polymer fibres turned into yarn and fabric?

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man-made fibre Figure 1: Three common polymer structures. The linear, branched, and network architectures are represented (from top), respectively, by high-density polyethylene (HDPE), low-density polyethylene (LDPE), and phenol formaldehyde (PF). The chemical structure and molecular structure of highlighted regions are also shown.

Man-made polymer fibres are transformed into yarn and fabric through a multi-stage process of extrusion, conversion, and construction.

Spinning and Yarn Formation

The process begins with spinning, where a polymer is heated or dissolved into a liquid state and extruded through a spinnerette to form continuous filaments. Because these filaments have extreme length, they can be made into yarn by loosely twisting them together.12

If the filaments are cut into shorter, predetermined lengths, they become staple fibres. To be spun into yarn, these staple fibres often undergo texturing or crimping—a process that introduces waviness to mimic the properties of natural fibres like wool, which helps the fibres hold together during the spinning process.23

Fabric Construction

Once yarn is produced, it can be woven or knitted into fabric. Alternatively, man-made fibres can be used to create nonwoven fabrics through various bonding methods:
* Adhesive Bonding: Fibres are formed into a web and held together using adhesives like latex or acrylics.4
* Mechanical Bonding: Webs are strengthened through needle-punching, which entangles the fibres.4
* Stitch Bonding: Machines like the Arachne machine stitch through a fibrous web to provide structural strength.4
* Thermal Bonding: Thermoplastic fibres or core-sheath yarns are heated to "spot weld" the fibres together at junction points.4