About us » Partners » Machine Manufacturers Machine Manufacturers When you have a HF-welding machine you most probably have other types of machines for other parts of your production. Forsstrom High Frequency AB has partnered with the following machine manufacturers. Carmo A/S Carmo A/S is a supplier of injection moulding of plastic and PVC components globally. Zünd Zünd cutting systems and software combine to form an unbeatable solution that fits seamlessly into your production process. Robart International Robart International offer a wide range of slitting and rewinding machines for every budget.