Polyester Cord

Material selection
The main materials used to produce rope can be natural fibers such as cotton, silk, and synthetic fibers such as polypropylene, polyester, and polyethylene. The choice of material depends on the type of rope product desired. Cotton and silk fibers are usually used to produce thread and yarn, which are then woven into fabric.

Fiber drawing
After selecting the raw materials, the polypropylene (melting temperature ~165°C) and polyethylene (melting temperature ~120°C) plastic pellets are melted. Each production line may have different melting methods, such as melting with hot air flow or with heat.

Fiber processing
After being drawn into fibers and passing through the sawtooth mesh, the fibers are cooled down by passing through cooling machines. After the cooling stage, they are compressed by rollers before being twisted into twisted fibers. There are different twisting methods, such as right-hand twist and left-hand twist, depending on the machine configuration.

Twisting fibers into rope
After being collected, the fiber spools are placed on a frame. The ends of the fibers are pulled through a hole on a fixed plate and fed into a compressing tube. As the fibers pass through the compressing tube, it is twisted in the opposite direction of the fiber twist to create a tighter fiber.

Quality control
The level of quality control depends on the intended use of the rope.
Ropes intended for general use are usually sold by diameter, length, breaking strength, and load-bearing capacity. Basic material specifications and visual inspections are quality control measures for this type of rope.