Carbon dioxide foaming agent injection device for producing polystyrene extruded sheet and injection method thereof

Abstract

The invention relates to a carbon dioxide foaming agent injection device for producing a polystyrene extruded sheet and an injection method thereof. The injection device comprises a carbon dioxide storage tank, a primary metering pump, a carbon dioxide buffer tank, a secondary metering pump and a one way valve, wherein a conveying pipe is arranged between the output end of the carbon dioxide storage tank and the primary metering pump; the other end of the primary metering pump is connected with the input end of the carbon dioxide buffer tank; the output end of the carbon dioxide buffer tank is connected with the secondary metering pump through the conveying pipe; the other end of the secondary metering pump is provided with the conveying pipe to be connected with an extruder; one end of the conveying pipe connected with the extruder is provided with the one way valve. The injection method comprises the following steps: conveying gaseous carbon dioxide from the carbon dioxide storage tank to the carbon dioxide buffer tank through the primary metering pump; maintaining pressure of the carbon dioxide buffer tank at 8 to 10MPa through controlling the primary metering pump; conveying the liquid carbon dioxide from the carbon dioxide buffer tank to the extruder through the one way valve by the secondary metering pump.

Description

technical field [0001] The present invention relates to a carbon dioxide foaming agent injection device and injection method for polystyrene extruded board production and relates to a carbon dioxide foaming agent injection device and injection method for XPS polystyrene extruded foam insulation board production, which belongs to foaming In the field of insulation board production, it is mainly used for the injection of carbon dioxide foaming agent in the production of XPS polystyrene extruded foam insulation board. Background technique [0002] The traditional XPS extruded foam insulation board production line uses fluorine series foaming agents (such as HCFC-142B and HCFC-22). As we all know, Freon is the main cause of the hole in the ozone layer. The use of Freon is not conducive to environmental protection, so carbon dioxide is used instead Freon is used as a foaming agent for XPS production, and the boiling point of carbon dioxide is -78°C, and it is easy to vaporize und...

AI Technical Summary

Problems solved by technology

[0002] The traditional XPS extruded foam insulation board production line uses fluorine series foaming agents (such as HCFC-142B and HCFC-22). As we all know, Freon is the main cause of the hole in the ozone layer. The use of Freon is not conducive to environmental protection, so carbon dioxide is used instead Freon is used as a foaming agent for XPS production, and the boiling point of carbon dioxide is -78°C, and it is easy to vaporize under pressurized conditions. If it is transported through a primary metering pump, it is difficult to ensure that it will pass through because the piston of the metering pump moves back and forth. The metering pumps are all liquid carbon dioxide, so it is difficult to ensure accurate and quantitative delivery of carbon dioxide to the extruder system

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