What method is generally used for the production of plastic window frames?

The production of plastic window frames is commonly achieved through the extrusion method. In this process, plastic material is heated until it becomes pliable and then forced through a die to create long profiles of the desired shape, which in the case of window frames is typically a continuous length profile that can be cut to the necessary size.

Extrusion is particularly advantageous for producing items like window frames because it allows for the creation of complex shapes and profiles in a continuous process. This results in efficiency and consistency in the production, as the same shape can be manufactured repeatedly without significant changes. The extruded profiles can later be cut, drilled, and assembled to form the final window frame.

While other methods such as injection moulding are useful for complex shapes and parts with high detail, they are generally more suited to creating smaller components rather than lengthy profiles needed for window frames. Compression moulding and blow moulding also serve specific applications, but they are not typically employed for fabricating the elongated shapes required for window frames. Thus, extrusion stands out as the preferred method for this particular application.