Micro-foaming screw capable of detecting material state

Abstract

The invention provides a micro-foaming screw capable of detecting material state, which belongs to the technical filed of injection molding parts. The micro-foaming screw capable of detecting material state comprises a rod-shaped body and a charging barrel; the rod-shaped body is inserted in the charging barrel in a rotating manner; a feed inlet and a fluid inlet are formed in the charging barrel; the rod-shaped body is provided with an injection-section, a metering section and a compression section along the axial direction; a plurality of electrode rings I are fixedly connected on the peripheral wall of the rod-shaped body along the axial direction, and the plurality of electrode rings are respectively located on the injection-section, the metering section and the compression section; a plurality of electrode rings II are fixedly connected on the inner circumferential wall of the charging barrel along the axial direction, and the plurality of electrode rings II are opposite to the plurality of electrode rings I correspondingly. The micro-foaming screw capable of detecting material state can detect the mixed state between melt material in the charging barrel and super critical fluid.

Description

technical field [0001] The invention belongs to the technical field of injection molding parts, relates to a micro-foaming screw, in particular to a micro-foaming screw capable of measuring the state of materials. Background technique [0002] Plastic injection molding needs to mix the molten material with the supercritical fluid during the injection molding process. The uniformity of mixing the molten material and the supercritical fluid has an important influence on the foaming effect, and the difficulty of mixing is determined by the molten material to the supercritical fluid. The solubility of molten material to supercritical fluid is related to the dielectric constant of supercritical fluid, and the dielectric constant of critical fluid changes sharply with the change of pressure and temperature. At the same time, due to changes in external conditions, the supercritical fluid may deviate from the supercritical state, which affects the quality of foaming. [0003] For e...

AI Technical Summary

Problems solved by technology

The method is that the power unit drives the screw to rotate, and the vibrator drives the screw to vibrate periodically in the axial direction; the material is plasticized and melted under the dual action of the shear force field and the vibration force field of the screw, and at the same time, the supercritical fluid delivery unit is sent to the The supercritical fluid is injected into the barrel, and the supercritical fluid and the molten material quickly form a single system of supercritical fluid / polymer melt under the action of a double force field; finally enter the molding unit for foaming and shaping, but the molten material and super The critical fluid is between the barrel and the screw, the uniformity and dielectric constant of the two are difficult to measure, and the state of the mixture cannot be determined accurately in time

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