18 مرداد 1404
PET (polyethylene terephthalate) straps are made through an extrusion process. First, PET resin is melted and then forced through a die to form a continuous sheet. This sheet is then stretched and oriented to increase its strength and flexibility. Finally, it is cooled, embossed, and cut to the desired strap width.
Here are some more details:
Melting of raw materials:
PET resin is heated to a molten state (around 260-280°C) in specialized industrial machines.
Extrusion:
The molten PET is forced through a die, creating a long, continuous sheet of plastic. The shape of the die determines the final width and thickness of the strap.
Stretching and Orientation:
The sheet is stretched to increase its tensile strength and molecular alignment. This process, called orientation, is critical to achieving the desired strength and flexibility of the belt.
4. Cooling:
The drawn sheet is cooled, usually in a water bath, to harden the plastic and hold its shape.
5. Embossing (optional):
A textured surface can be added to the belt through embossing. This improves adhesion and handling and prevents slipping during use.
6. Cutting:
The continuous sheet is then cut into individual belts of the required width.
