It's also used to make synthetic fibers. For example, polyester fibers in clothing are often made from PET. These fibers are durable and wrinkle - resistant.

• Polyester Fibers: PET is used to produce polyester fibers for clothing, bedding, and upholstery. Polyester clothing is known for its durability, wrinkle - resistance, and quick - drying properties. It's used to make everything from shirts and pants to sportswear and outdoor gear.

• Used for: Creating hollow PET products, especially bottles and containers. In blow molding, a parison (a pre - formed tube - like structure of PET) is placed in the moUld and then inflated to take the shape of the mold cavity.

• Mold Features: The moulds have a split - design that allows the easy removal of the finished hollow product. They also need to provide a consistent thickness distribution during the blowing process. The inner surface of the mould determines the outer shape and finish of the PET bottle or container.

• Used for: Forming thin - walled PET products such as trays and blister packs. In thermoforming, a flat PET sheet is heated until it's pliable and then drawn into the mould cavity using vacuum or pressure.

• Mould Considerations: The molds for thermoforming usually have a female cavity with a textured or smooth surface depending on the desired finish of the product. Vent holes are an important part of the mold design to ensure proper air evacuation during the forming process to achieve a well - formed product.