Cavity moulds, also called concave moulds, are the working parts for moulding the outer surface of plastic parts, which can be divided into two categories, integral and combined, according to their structure. It is the term for moulds in the production manufacturing industry. The parts that constitute the space of the product are called moulding parts (i.e. The mould as a whole), and the parts that form the outer surface of the product are called cavity moulds.