Doublestar is the largest foundry equipment company in China. and has a stock listed in China.has designed and produced all high automatic vacuum process molding line in China.Vacuum Molding Line is a new type molding process and adopt singleness dry sand ( no water, bond, tagger), then it is hot up, molding, pressurized sand-box, take out the air, so the sand is tighten. The course is physics molding way. Vacuum molding line process is as follows, cover face film, spray, reverse empty box, sand-up vibrate compaction, cover reverse film, lift box, mould assembling, pouring, losse box, opertional process is shown in schematic. My company have Vacuum molding dedicated laboratory equipment, according to the actual needs of the user's to supply process experiments, while molding process experts provide you with a full range of technical advisory services and advanced technology solutions. Company according to user specific requriments, tailored for the user to own non-standard production lines. Patents and Achievements of Vacuum molding line1. Vacuum molding line Patent No: ZL200620085490.02. Take laminating device of Vacuum molding line Patent No: ZL200620085481.13. Rollover machine Patent No: ZL200620085482.64. Vacuum control device Patent No: ZL200620085482.65. Rainy sand-up device Patent No: ZL200620085489.86. Molding line with manipulator Patent No: ZL200720030690.020 moulds per hour Vacuum molding line is listed as 2008-2009 years New Products Plan of China by Ministry of Science and Technology of China.