Knobs and dials that have a plastic exterior more than a metallic interior are samples of insert molding. The substrate is inserted to the mould, then plastic is injected onto it. Usually this method makes use of thermoplastic resin because the overmolding material. Most polymers, at times known as resins, https://wavesocialmedia.com/story3656429/the-5-second-trick-for-plastic-injection-molding-manufacturer