Supercritical saturated particle pneumatic conveying micro-foaming injection molding device and method
An injection molding device and pneumatic conveying technology, which is applied in the field of polymer material processing and molding, can solve the problems of gas escape, large impact, affecting foaming effect and product quality, and achieve high production efficiency, shortening time, and equipment transformation low-complexity effects
Active Publication Date: 2019-05-24
BEIJING UNIV OF CHEM TECH
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Problems solved by technology
However, the temperature environment where the saturated raw material is placed and the time between taking out the saturated raw material and adding it to the injection molding machine for melting and plasticizing have a greater impact on the permeable material, which will easily cause gas to escape, affecting the foaming effect and product quality
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[0020] The supercritical saturated particle pneumatic conveying micro-foaming injection molding device of the present invention, such as figure 1 As shown, the main devices include a supercritical fluid permeation device, a pneumatic conveying device and an injection molding device.
[0021] The supercritical fluid permeation device is mainly composed of an air supply tank 9, a supercritical fluid generator 8, a permeation tank 6, an air lock 5, a discharge valve 10, and a gas pipe. The kettles 6 are in turn connected by air pipes. A pressure control valve 7, a booster pump, etc. are arranged between the supercritical fluid generator 8 and the osmosis tank 6 to control the pressure in the osmosis tank. The temperature in the permeation tank 6 is maintained above the critical temperature of the supercritical fluid. The effect of air locker 5 is to evenly feed or unload, and prevent gas from leaking in simultaneously. The function of the discharge valve 10 is to control the d...
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The invention relates to a supercritically saturated particle pneumatic conveying micro-foaming injection molding device and method. The device mainly comprises a supercritical fluid permeation device, a pneumatic conveying device and an injection molding device, wherein the supercritical fluid permeation device mainly consists of a gas supply tank, a supercritical fluid generator, a permeation kettle, a gas locker, a material discharging valve, a gas pipe and the like; the pneumatic conveying device mainly comprises a gas compressor, a dryer, a gas storage tank, a material receiver, a gas pipe, a conveying pipe and the like; the injection molding device comprises an injection molding system, a die assembling system, a power system and a control system; the permeation kettle has two structural forms; one structural form is provided with a closed space; a material is conveyed to the material receiver through the pressure in the permeation kettle and the gravity of the material; the other structural form is divided by a partition; a saturated raw material in an upper-layer space of the permeation kettle enters a lower-layer space of the permeation kettle by switching the gas locker. According to the device and the method, the time that the saturated raw material is added into an injection molding machine is shortened, escape of gas molecules is reduced, and the equipment transformation complexity is low.
Description
technical field [0001] The invention relates to a micro-foaming injection molding method, in particular to a micro-foaming injection molding method for supercritical saturated particles pneumatically transported, and belongs to the field of polymer material processing and molding. Background technique [0002] Micro-foaming injection is a promising high-end energy-saving molding technology. Its technology breaks through many limitations of traditional injection molding, which can significantly reduce the weight of the part, shorten the molding cycle, and greatly improve the warpage of the part. deformation and dimensional stability. In the production of precision products with high-quality requirements, the micro-foaming injection molding process has great advantages. There are mainly two kinds of existing micro-foaming injection molding process methods: one is to dissolve supercritical fluid (carbon dioxide or nitrogen) into the melt for molding, and the other is to use su...
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IPC IPC(8): B29C45/17B29C45/18B29C45/47
CPCB29C45/1703B29C45/18B29C45/47
Inventor 杨卫民鉴冉冉谢鹏程
Owner BEIJING UNIV OF CHEM TECH