Process for production of extruded polystyrene foam plate by CO2 foaming

Abstract

Relating to the technical field of extruded polystyrene foam plates, the invention provides a process for production of an extruded polystyrene foam plate by CO2 foaming. The production technology process includes: adding raw materials into a double-screw extruder through a six-component weight loss type feeding device, injecting butane, CO2 and ethanol into the double-screw extruder to conduct foaming through a specific metering system; extruding the foamed material to a net change machine by the double-screw extruder, conveying the material to a single screw extruder by the net change machine and conducting static mixing, letting the single screw extruder to extrude the mixed material to a shaping mold head, shaping a foam plate on the shaping mould head by a mold temperature controller, leveling the shaped foam plate by a leveling machine, stretching the leveled foam plate by a heavy drawing machine, cooling the stretched foam plate by a cooling stage and conveying it to the cooling stage. The process provided by the invention has the advantages of production cost reduction, time saving, accurate control, convenient operation, and ensures process stability.

Description

Technical field: [0001] The invention relates to the technical field of extruded polystyrene foam boards, in particular to a 2 Production process of foamed extruded polystyrene foam board. Background technique: [0002] The XPS foam industry started in the late 1990s as a new industry, using HCFC-22 / 142b as a blowing agent. In China, almost all XPS foams are used as building insulation materials. They are mainly used in house insulation, laying high-speed railways, cold storage insulation, plateau ordinary railway subgrades, airport runway insulation layers, and manufacturing field mobile communication rooms, ventilation pipes, and other materials. After compounding, it can be used as thermal insulation decoration (decoration) material, etc. [0003] As one of the HCFCs consumption industries in China, the XPS foam industry is characterized by a large number of small and medium-sized enterprises, which are widely distributed. Due to the limitations of its technical level,...

AI Technical Summary

Problems solved by technology

[0006] The traditional extrusion foaming process of HCFCs materials such as figure 1 As shown, most of the blowing agents used in its production are F22 (HCLF2), which are HCFC substances. The HCFC substances have an impact on the climate and are expensive. HCFC substances are ozone-depleting blowing agents, which are inconvenient to use.

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