1. Introduction: The foaming machine is the core component of the continuous sandwich panel production line, which directly affects the quality of the finished panel. Due to the difficulty of foaming technology and the invisible foaming process, it is covered with a mysterious veil. WEIHUA has been committed to the research of foaming machine for many years. This technology involves 1) fluid mechanics, 2) fluid heat exchange, 3) gas-liquid emulsification 4) chemical raw materials 5) electrical automation control, 6) internal combustion engine common rail injector technology (needle tip injection technology),7) precision mechanical design and manufacturing heat treatment, (VIII) pentane explosion-proof safety and other sub-areas of the core technology. 2. Technology: With the promotion and application of high flame retardant PIRB1 grade polyurethane, pentane is put into use as a foaming agent, and the new foaming machine will become the core configuration of the production line. After nearly two decades of continuous development and optimization of the foaming machine, Weihua has now fully mastered all the core technologies and has been successfully applied to many production lines at home and abroad. These technologies include: flow control technology: temperature control technology: self-cleaning gun head technology: high-speed shear mixing and emulsification technology: 3. technical parameters: 1) unit pouring volume: 120-500 g/s;2) Spray pressure range of pouring head: 12-18Mpa, rated 15Mpa;3) pouring head pressure adjustment: pneumatic, on-line adjustment during production; 4) Flow system control of each component: automatic closed-loop control of flow (manual operation);5) Working nature of the unit: continuous operation under high pressure; 6) working material tank volume: polyol 300L; Isocyanate 300L;7) material temperature control error: 2 ℃;8) temperature control system heating: 2 × 6Kw, cooling: 20000Kcal/h (refrigerating capacity);4. Foaming performance: the foaming performance of the finished board is quite good. The following figure is a cold storage sandwich panel with a thickness of 250mm and a fire rating of B2. The enclosed area percentage is high and the thermal conductivity is low. 9) The input power is about 45Kw pentane system. According to the Montreal Protocol on Substances that Deplete the Ozone Layer published in 1989, the use of chlorofluorocarbons has been discontinued in Europe and the Americas. Since 1993, cyclopentane has been considered in Europe as an alternative to chlorofluorocarbons. Currently, China, India, the United Arab Emirates and other developing countries are phasing out CFCs/HCFCs. For the foaming system with pentane as foaming agent, the following factors need to be considered: 4. Pentane storage system Pentane storage and conveying system is mainly used to store cyclopentane unloaded from the tanker and automatically feed the foaming machine. Because pentane vapor is flammable and explosive, the system must be strictly in accordance with the relevant standards. The pentane storage system includes: tank body, pentane delivery system, tank body breathing system, liquid level system, unloading system and pentane detection system. 5. Pentane foaming system All pentane-related parts and pipelines on the foaming machine are installed in a small room with probes and dual exhaust systems to ensure safety. The detection head is installed on the storage tank. The safety system is controlled by an independent electrical cabinet, independent of the operating cabinet. 6. Pentane safety system Pentane detection devices will be installed in pentane leakage areas and possible leakage areas, including crawler and cloth areas and storage tanks. Help customers run production lines safely and reliably. MAIN ACHIEVEMENTS WEIHUA is the only Chinese company that has won the bid for the United Nations pentane continuous foaming machine project (refer to the winning documents). We have mastered pentane storage, transportation, mixing, safety and other technologies, and put into actual production in 2014. We not only provide equipment, but also provide customers with a series of services such as establishing employee training mechanism, operating procedures, post leakage early warning mechanism, etc., to achieve 100 percent safety from machine to personnel. WEIHUA's latest product: four-component foaming machine for polyurethane sandwich panel production line, delivered to Duowei Group, a leading domestic sandwich panel manufacturer. The flow accuracy of MDI is 1 ‰, the mixture is 1 ‰, the catalyst is 1 ‰, and the foaming agent is 5 ‰.