Study & Application On Gas-assisted Injection Molding Technology

Gas-Assisted Injection Molding(GAIM) technology is the use of high-pressure inert gas injection in the internal parts have a hollow cross section and to promote the completion of the melt filling process,to achieve uniform gas pressure,forming a non-uniform thickness parts,The elimination of products forming a defect in the 1990s in developed countries began to enter the practical stage of the new plastic molding technology GAIM has the advantage of technology:â‘ Significantly reduce the production cycle.Gas-assisted injection molding cycle with the ordinary injection molding cycle,shortening the time shooting rubber, in addition to feeding time pressure,cooling time is also reduced.As a result,greatly reducing the molding cycle,which is very useful to reduce the cost of products.â‘¡Cavity pressure and the clamping force significantly reduced.Ordinary injection molding machine in the injection pressure and need a lot of mold cavity pressure,especially in solving the shrinkage and dent the time required a lot of clamping force to ensure that.while the gas-assisted injection molding technology only smaller The gas pressure will be able to move forward plastic to make it close to mold wall,reducing the mold cavity pressure,thus greatly reduced clamping force of up to 70 percent lower.â‘¢Save on materials.As the gas-assisted technology in some parts filled with gas,better control of wall thickness,and therefore consumption of raw materials,less than the traditional injection method,generally reduced by 10%to 50%.â‘£Products significantly reduce defects.Due to the small injection pressure, and the plastic melt in the internal gas pressure throughout.As a result,cavity-pressure distribution,packing in the process of cooling produced by small residual stress,the products reduce the tendency to die after warping;in the packing process,the melt of the gas can be contracted through the second to advance Compensation and gas pressure so that products can be close to the outer surface of the mold cavity,the products will not appear on the surface depression;Using gas-assisted molding products can be emptied in order to reduce the thick part of the reduction or even elimination of marks and improve the quality of the surface,reducing the reject rate.This article on gas-assisted injection molding process and application research,the full text is divided into five chapters: Chapterâ… introduction.This chapter introduces the basic gas-assisted injection molding process,gas-assisted injection molding process and the classification of gas-assisted molding technology constitute a comprehensive set gas-assisted molding technology development and application of domestic and international profile.Analyze of the gas-assisted molding technology research and practical significance.Gas-assisted molding process parameters of the chapterâ…¡.CEA application of this chapter simulation technology for gas assisted molding process parameters,the melt from the injection temperature,gas injection pressure,the delay time,melt pre-injection volume conducted a series of simulations to understand the various parameters on the results of the gas-assisted molding.The gas-assisted injection molding airway key design technology research of the chapterâ…¢.This chapter is research and analysis of the gas in gas-assisted injection molding cavity formation mechanism,and the formation of the factors that affect.On the gas in gas-assisted injection molding and gas distribution channel of its own channel cross-section shape and size were studied.Airway design,the key question is how to combine the use of building materials used and forming conditions into consideration the layout of the airway,the cross-section shape and size and other factors.Gas-assisted injection molding techniques of the chapterâ…£.The main chapter on gas-assisted molding technology in the application of gas-assisted devices,materials, hardware,such as mold conditions,as well as examples,the understanding of the gas-assisted technology in a variety of plastic products on the application.Chapterâ…¤is conclusion.