Polyethylene terephthalate (PET) is a widely used plastic material, known for its strength, clarity, and versatility. It is predominantly used in the packaging industry, particularly for beverage bottles, food containers, and various consumer goods. The manufacturing of PET products involves the use of PET moulds designed specifically for shaping and forming this material.

Injection moulds are among the most common types used in PET production. This method involves injecting molten PET resin into a pre-designed mould cavity, where it cools and solidifies into the desired shape. Injection moulding is particularly effective for producing preforms, which are then later blow-moulded into bottles or containers. The advantages of injection moulding include high precision, the ability to produce complex shapes, and excellent surface finish. This method is widely used in the production of caps, lids, and other small components.

Blow moulds are specifically designed for shaping PET into hollow objects, such as bottles and jars. The blow moulding process involves first creating a preform through injection moulding. The preform is then heated and placed into a blow mould, where air is blown into it, causing it to expand and take the shape of the mould. There are two primary types of blow moulding processes: extrusion blow moulding and injection stretch blow moulding. Each method has its unique advantages and is chosen based on the specific requirements of the final product.

Extrusion moulds are used in the extrusion blow moulding process, which is ideal for producing large containers and bottles with a uniform wall thickness. In this method, molten PET is forced through a die to create a continuous tube, known as a parison. The parison is then placed in a mould, where it is blown to achieve the desired shape. Extrusion moulding is efficient for producing larger volumes and is often used for industrial containers and packaging applications.