Melt extrusion pressure-driven flow equalization method and device with inner and outer helicoid rotors

Abstract

The invention discloses a flow equalizing method and device for a rotor driven by melt extrusion pressure and provided with internal and external screw flights. The method comprises the steps that after polymer melt from an extruder encounters with a barrier in an input area of the rotor, circular flow dividing is carried out along the internal and external screw flights of the rotor, and the rotor is forced to rotate to form a multi-end spiral after the internal and external screw flights are filled with flow; and flow is conveyed to an output area of the rotor along with rotation of the rotor, and extrusion speed can be evenly distributed in the circular direction of the rotor. The device comprises a core mold, a mold head base body, a neck mold and the rotor which are arranged coaxially, and the rotor is provided with the internal and external screw flights. The core mold is arranged in the mold head base body, the rotor is arranged in a melt runner between the core mold and the mold head base body, and the neck mold is arranged at one end of the mold head base body. The external screw flights are arranged on the outer side of the rotor, the internal screw flights are arranged on the inner side of the rotor, a clearance is reserved between the inner side of the rotor and the core mold, and a clearance is reserved between the outer side of the rotor and the mold head base body. The problem that flow distribution of the polymer melt in a mold head is uneven can be effectively solved, and no drive device needs to be added.

Description

technical field [0001] The invention relates to a pipe extruding die head, in particular to a flow equalization method and device for melt extrusion pressure-driven rotors with internal and external helical ribs. Background technique [0002] The pipe extrusion die head is an indispensable and important part in the pipe extrusion production line. Its function is to keep the plasticized material in a plastic state and generate a certain pressure so that the plasticized material can be formed after passing through a certain flow channel. It is a tube blank with a circular cross-sectional shape. [0003] The die head mainly has the following functions: to change the material from spiral motion to linear motion; to generate the necessary molding pressure; to ensure the compactness of the product; to further plasticize the material through the die head; to shape the cross-sectional shape required by the die head products. Among the current flat die heads, the annular melt extru...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a melt extrusion pressure-driven flow equalization method with inner and outer helical rotors, which can effectively solve the problem of uneven flow distribution of polymer melt in the die head , without additional drive

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