Multi-component mixed double-input screw extrusion equipment and extrusion processing method

Abstract

The invention belongs to the technical field of agricultural product processing, and particularly relates to multi-component mixed double-input screw extrusion equipment and an extrusion processing method. The equipment comprises a screw extruder body, an extrusion molding assembly, a die orifice element, a heat insulation feeding device and a control system, the screw extruder body comprises a front-end double-input type extruding and melting area, a rear-end extruding and mixing area and a melt conveying assembly located between the front-end double-input type extruding and melting area and the rear-end extruding and mixing area, a traditional screw extruder is improved, and materials are pretreated in a double-screw machine barrel with independent section temperature control; and shearing, mixing and cooking to enable the materials to be converged into a screw extruder in a molten state for re-mixing. Melt input is applied, so that the proportional mixing uniformity of different components is improved. And the flow control valve at the tail end of the melt conveying assembly effectively controls the mixed flow, so that the quality of extruded products is ensured, and meanwhile, the operability and the production continuity are enhanced.

Description

technical field [0001] The invention belongs to the technical field of agricultural product processing, and particularly relates to a multi-component mixing double-input screw extrusion equipment and an extrusion processing method. Background technique [0002] Screw extrusion is an integrated process of mixing, shearing, kneading, cooking, compressing and extruding molten material through a narrow opening (die) under high pressure, usually involving physical and chemical simultaneous flow and heat transfer Therefore, the screw extruder can be regarded as a system of multiple energies interacting with higher temperature, pressure and mechanical shear. Due to its simple operation, easy control, good formability, and modular and continuous production capacity, it is currently widely used in the mixing process of high-viscosity materials such as polymer processing, rubber mixing, and food processing, including but not limited to solid Filler incorporation into polymer melts, p...

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Problems solved by technology

[0007] 1. In the more common multi-component application and research scenarios, mixed raw materials need to be pre-mixed with a mixer for a long time before extrusion, otherwise the uniformity of the raw materials is poor, which limits the melt reaction process in the barrel And the degree of reaction, and directly lead to the inhomogeneity of the extruded product

[0008] 2. Due to the fast thermal conductivity, the long-time work of the feeding device and the reverse heat conduction of the barrel will cause its temperature to be too high, higher than the melting point of the solid, so that part of the powder material softens and sticks, blocking the discharge port, resulting in The termination of continuous production seriously reduces the efficiency and continuity of the industrial production process

[0009] 3. The physical and chemical properties of different materials are different, and they are prone to denaturation at high temperatures. Therefore, a new method is needed to effectively achieve separate control to better exert their nutritional value and functional properties

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