Nozzle is usually made of polyvinyl chloride (PVC) or polypropylene (PP). These materials have good corrosion resistance, high temperature resistance and pressure resistance, and are suitable for transporting liquid drugs. As for whether explosive pipe joints can be hot-melt welded or not, whether PVC and PP materials can be hot-melt welded. Hot-melt welding is a common method of pipe connection. The pipe joints are melted by heating, and then quickly connected to form a firm connection. Therefore, the spray pipe joint can be connected by hot melt welding.