Film blowing device used for PLA film production and provided with multiple layers of co-extrusion scrapers

Abstract

The invention discloses a film blowing device used for PLA film production and provided with multiple layers of co-extrusion scrapers, and belongs to the technical field of film blowing equipment.The film blowing device comprises a bottom plate, a cylindrical material melting shell is arranged above the bottom plate, a cylindrical discharging shell is fixedly arranged above the left side of the material melting shell, and a film blowing head used for film blowing is fixedly arranged in the middle of the other side of the discharging shell; a feeding pipe is fixedly arranged in the middle of the right side of the material melting shell, a feeding hopper is fixedly arranged in the middle of the upper end of the feeding pipe, and the discharging mechanism, the material guiding assembly and the power transmission assembly are matched with one another, so that PLA particles can be quickly melted into molten polymers, and the molten polymers are extruded into the film blowing head from one end of the discharging shell; the whole process is powered by the driving motor without additional power, so that the extrusion speed of the molten polymer can be quickly controlled.

Description

technical field [0001] The invention relates to the technical field of film blowing equipment, in particular to a film blowing device with a multi-layer co-extrusion blade for PLA film production. Background technique [0002] The film blowing machine heats and melts plastic particles and then blows them into a film; there are many kinds of film blowing machines, including PE, POF, PVC and PLA, etc.; the technological process of the film blowing machine is: raw material mixing - thermoplastic extrusion - inflation - Cooling-drawing-winding, the PLA particles enter the screw from the hopper by their own weight. When the particles are in contact with the oblique edge of the thread, the rotating oblique edge faces the plastic and produces a thrust perpendicular to the oblique edge, pushing the plastic particles forward During the passage, due to the friction between the plastic and the screw, the plastic and the barrel, the collision friction between the particles, and the grad...

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Problems solved by technology

[0003] In the existing technology, if you want to speed up the extrusion speed of molten polymer, you must increase the power of the motor to increase the rotation speed of the screw. Although this method of increasing the speed of the screw to increase the speed of the extruded material is simple and fast, when the screw generates If the shear rate is greater than a certain limit value, it will cause the molten material to flow unstable, so that the surface of the extrudate will be uneven or the shape will be distorted. This phenomenon is also called melt fracture. If the conduit The phenomenon of melt fracture in the inner polymer melt will greatly affect the surface quality of PLA film. Therefore, a film blowing device with multi-layer co-extrusion scraper for PLA film production is proposed to solve the problem that the production speed cannot be increased.

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