How is polyester yarn made- Xinghui Chemical Fiber Group Co., Ltd.

How is polyester yarn made

Update:14-06-2023

Polyester yarn is made through a process called polymerization, which involves the transformation of a chemical substance called monomer into a polymer. Here is a general overview of the manufacturing process for polyester yarn:

Monomer production: The primary monomer used in polyester production is ethylene terephthalate (PET). PET is derived from petroleum or natural gas through a chemical reaction.

Polymerization: The PET monomers are subjected to a high-temperature process, typically under vacuum conditions, to initiate polymerization. This process involves combining the monomers and a catalyst to form long-chain polymers.

Melt spinning: The polymerized PET is then melted and extruded through a spinneret, which is a plate with small holes or slits. These holes determine the size and shape of the resulting filament.

Solidification: As the molten polymer emerges from the spinneret, it passes through a cooling chamber or air stream, causing it to solidify and form continuous filaments. The filaments are rapidly cooled to stabilize their shape.

Drawing: The solidified filaments undergo a drawing process, where they are pulled at high speeds to align the molecules and increase their strength and orientation. This stretching process also reduces the diameter of the filaments.

Heat setting: The drawn filaments are then exposed to heat to further stabilize their structure and remove any residual stresses. This step is known as heat setting and helps the filaments retain their shape and properties.

Twisting and winding: The polyester filaments may undergo additional processes such as twisting and winding, depending on the intended use of the yarn. Twisting involves combining multiple filaments to create a stronger yarn, while winding involves spooling the yarn onto bobbins or cones for storage or further processing.

Finishing: After the yarn is wound, it may undergo various finishing treatments, such as lubrication, dyeing, or texturizing, to enhance its performance and appearance. These treatments can be tailored to meet specific requirements based on the intended application of the yarn.