Conical-double-screw extruder for producing XPS thermal insulation board

Abstract

The invention relates to a conical double-screw extruder used for XPS thermal insulation board production. A pair of matched conical screws are placed in a charging barrel, a continuous and uninterrupted sealing barrel body structure is adopted between a feeding opening and a discharging opening of the charging barrel, and the widths of the screw flights of the two conical screws are not less than 8 mm. The conical double-screw extruder and a single-screw extruder are combined into a screw extruder with one double-cone and one single-double-step, compared with the combination of a screw extruder with two single-double-steps, the screw extruder with one double-cone and one single-double-step has the advantages of enforced delivery, efficient plasticizing, mixing and smelting and shearing dispersion, and overcomes the disadvantages of low productivity of the combination of a screw extruder with two single-double-steps, high requirement to the raw material, unstable process production and high energy consumption; compared with the screw extruder with one two-parallel and one single-double-step respectively connected with a parallel double-screw extruder and a single-screw extruder in series, the cost of investment is greatly reduced, and the popularization and the promotion are favorable.

Description

[Technical Field] [0001] The invention modifies the existing conical twin-screw extruder so that it can be combined with a single-screw extruder to produce extruded insulation boards. [Background technique] [0002] Extruded polystyrene insulation board (XPS insulation board for short), due to its micro-closed honeycomb structure, presents excellent compression resistance, aging resistance and water resistance, and has good heat insulation and water barrier functions , You can use recycled old plastics as raw materials, which not only reduces costs but also benefits environmental protection, and is more and more widely used in the construction industry. [0003] At present, the combination of two single-screw extruders connected in series is used in China to produce XPS insulation boards. This combination has low production capacity, high raw material requirements, unstable process production, and high energy consumption. [0004] Foreign countries have used a parallel twin-screw...

AI Technical Summary

Problems solved by technology

In our country, the manufacturing process of conical twin-screw extruder is mature and the production volume is large, so the cost is low. However, the current conical twin-screw extruder is only suitable for the production of PVC, PE and other products and cannot produce XPS insulation board.

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