Injecting and metering device for supercritical carbon dioxide in extrusion foaming

Abstract

The invention belongs to the field of mechanical equipment and manufacture and relates to an injecting and metering device for supercritical carbon dioxide in extrusion foaming. A carbon dioxide storage tank is communicated with a stop valve, a gas booster pump, a primary auxiliary gas bottle, a primary pressure switch, a high-pressure metering pump, a three-way valve, a secondary auxiliary gas bottle, a secondary pressure switch and a needle valve in sequence by a guide pipe to form an injecting pipeline. The three-way valve is simultaneously communicated with an emptying valve one end of which is communicated with air by a guide pipe. A solenoid valve which is controlled by a triplet takes compressed air as a power source to drive the movement of the gas booster pump and the primary pressure switch. The secondary pressure switch controls the movement of a control system of the high pressure metering pump and the high pressure metering pump. The supercritical carbon dioxide is output outwards from the other end of the needle valve. The device has the advantage that the stable supercritical injection of the carbon dioxide can be realized by a common domestic high pressure metering pump. The device disclosed by the invention is applicable to extrusion foaming equipment of the supercritical carbon dioxide.

Description

technical field [0001] The invention belongs to the field of mechanical equipment and manufacturing, and relates to a device used to control the generation, injection and metering of supercritical carbon dioxide in the extrusion and foaming production process of supercritical carbon dioxide, that is, a device for the extrusion of supercritical carbon dioxide Injection metering device in foaming. Background technique [0002] Foam plastics are aggregates formed by gas dispersion in solid polymers, and are a type of product with high application. Among them, PP (polypropylene) has become the material of choice for foam plastics due to its high rigidity, excellent mechanical properties, good chemical and thermal stability, good environmental adaptability and easy recycling. It is widely used in automobiles, It is used for heat insulation and cushioning packaging materials in fields with high standards and high performance requirements such as electronics and office stationery....

AI Technical Summary

Problems solved by technology

At present, carbon dioxide injection metering devices are mainly used abroad (especially in the United States, Germany and Italy), and domestic plunger pumps cannot be used for extruding and foaming carbon dioxide injection metering.

However, it cannot be easily used in the injection metering of supercritical carbon dioxide extrusion foaming machine with ordinary injection metering process.

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