The "Hot-Air Welding Machine" is designed according to the hot-breeze theory, will be a more efficient companion for advertising material instead of the glue.The equipment is also called PVC Welder,"Poster Welder Without Glue", "Seaming Machine" , "Heat-Jointer", "hot air welder", "heat welder", "banner welder"," welder", "hot air welding machine"," welding machine", "hot seaming machine" and "seamer",Model 4000H is the later one developed from Model 3000F/G:- Well seam pieces made of heat-meltable materials,such as PVC & PE fabric Canvas, Sailcloth, ...etc., without glue.- Small in volume, portable and light.- Save more manpower and cost on process.- Automaticly self-moveable, Automatic start.- High welding speed.- Assembled with nice and wearable spare parts.- Constructed simplely, easy to maintain.- Easy and comfortable operation, needs not much guide.- Proper pack for transport.- Digital display for controlling temperature and speed.- Proper packed up for transport, with shook-proof packing.- Needs only home power at work.