Plastic and synthetic-material products are typically made by pouring a liquid synthetic into a mold. As the liquid solidifies, the mold will give it shape. A mold builder who can manipulate various materials to create a solid cast for making these products is required to create these molds. Molds can be made from a variety of materials, including plastic, resin, metal, and wood, by a mold builder. The qualifications for this position vary, but in most cases, no specific level of education is required.
Basic math skills will be required, and an employer may request that the mold builder be familiar with a variety of computer programs, such as computer-aided drafting (CAD) programs. Although many builders choose to enroll in coursework that will make them more valuable job candidates, these skills can often be learned on the job. A working knowledge of a variety of machine tools, mold processes, and materials is often required, though much of this can be learned on the job. Many employers will also teach the mold builder the entire molding process from start to finish so that he or she has a better understanding of what is required in this line of work.
The mold builder may be responsible for removing the materials from the mold once it has been made and materials have been placed within it to cure or set. In some cases, breaking the mold is required, but in others, the materials can be carefully removed without causing damage to the mold. The mold builder may be in charge of designing the mold in such a way that it and the materials contained within it can be easily manipulated. This could include making hinges or other securing devices, as well as using waxes, resins, or adhesives.
Because various chemicals will be used in a mold-making environment, the mold-maker may be required to complete both safety and chemical-handling training. If the builder is in charge of the use of motorized machinery, it is likely that the employer will require the builder to complete safety training on these machines. Because some machines are computer numeric controlled (CNC), the builder may be required to receive training in CNC technology and machinery.