Polymer material bar single screw extrusion cylinder molding method and molding device thereof

Abstract

The invention relates to a polymer material bar single screw extrusion cylinder molding method and a molding device thereof. The method orderly comprises the following steps: charging from a charging seat, allowing the screw to be stationary, allowing the materials to move forward along a screw channel direction so as to be compacted gradually; allowing the polymer materials to continue moving forward with the screw channel so as to enter a screw root circle gradually-reducing section and a screw edge line disappearing section, allowing the polymer materials to change from moving along with the screw channel spiral motion into moving linearly along a direction parallel to the screw, with the disappearance of the screw root circle, allowing the polymer materials to fill a cavity of a rear cylinder so as to form a bar mold blank; under the action of the extrusion pressure, allowing the bar mold blank to perform rectilinear motion along the screw direction and to be plasticized under theaction of frictional heat and the heating of a heater outside the cylinder; performing a cooling and setting process; finally realizing the continuous molding of the polymer material bars. The advantages of the invention are that: it is realized that bars of polymer materials or composite materials with poor fluidity or even no fluidity are molded by single screw continuous molding; the molded polymer material bars have maintained physical properties of the polymer materials.

Description

technical field [0001] The invention relates to a single-screw extruder cylinder molding method and molding equipment for polymer material rods with poor fluidity. Background technique [0002] At present, there are mainly two methods of forming polymer material rods: ordinary single (double) screw extruder combined with rod head and molding and sintering. [0003] The molding method for thermoplastics and polymer material rods with certain fluidity is generally formed by a single (twin) screw extruder combined with a rod head. This molding method is mature and has high molding efficiency and is widely used. For thermosetting plastics and polymer materials with poor molding fluidity, such as ultra-high molecular weight polyethylene (UHMWPE) and polytetrafluoroethylene (PTFE) rods, etc., the molding method of molding and sintering is adopted. The molding process of this method is discontinuous. The molding time is long, the molding speed is 1-2m / h, the production efficiency ...

AI Technical Summary

Problems solved by technology

For thermosetting plastics and polymer materials with poor molding fluidity, such as ultra-high molecular weight polyethylene (UHMWPE) and polytetrafluoroethylene (PTFE) and other rods, the molding method of molding and sintering is adopted. The molding process of this method is discontinuous. The molding time is long, the molding speed is 1-2m / h, the production efficiency is low, and it is not suitable for molding large and extra small finished products, so it is subject to certain restrictions in production and application.

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