Method for preparing polypropylene filter plate

Abstract

The invention relates to a method for preparing a polypropylene filter plate. The method is rapid injection molding. The filter plate comprises a diaphragm core plate. A material is put into a material barrel of a stirring dryer and dried at 70 DEG C, the temperature of the two ends of an injection molding machine is set to be 210 DEG C, and the temperature of the middle of the injection molding machine is set to be 240 DEG C. Mold closing locking is performed for two times; in the first mold closing locking process, the mold locking pressure is set to be 20000KN, the injection feeding propelling is set to be multi-stage type, the first-stage time is set to be 35 seconds, the first-stage injection propelling pressure is set to be 11.0 MPa, the second-stage time is set to be 25 seconds, the second-stage injection propelling pressure is set to be 9.0 MPa, the third-stage time is set to be 20 seconds, the third-stage injection propelling pressure is set to be 7.0 MPa, the fourth-stage time is set to be 10 seconds, the fourth-stage injection propelling pressure is set to be 6.0 MPa, the fifth-stage pressure-maintaining time is set to be 3 minutes, the pressure-maintaining propelling pressure is 4.0 MPa; in the second mold closing locking process, the mold locking pressure is set to be 28000KN, a slider on a rabbet of a sealing surface automatically draws out before a mold is locked, the mold locking cooling pressure-maintaining time is 14-16 minutes, and the slider automatically resets when the mold of a second filter plate is closed, and the above procedures are cycled in turn, and the polypropylene filter plates are prepared through rapid injection molding.

Description

technical field [0001] The invention belongs to the field of filter presses of filter equipment, and relates to a preparation method of a polypropylene filter plate. Background technique [0002] The polypropylene filter plate is the main filter element of the filter press, which includes a polypropylene diaphragm filter plate. After the material is filtered, the filter cake remains in the chamber of the filter plate, and the filter cake is squeezed through the diaphragms on both sides of the diaphragm filter plate to remove the filter cake. The residual filtrate in the filter can realize the purity of the filter cake and the recovery rate of the filtrate, and achieve the purpose of solid-liquid separation. [0003] Polypropylene filter plate and diaphragm core plate are difficult to manufacture due to their large thickness and large area. Over the years, various manufacturers have used flat vulcanizing machines to mold them. The diaphragm core plate is the main body of the ...

AI Technical Summary

Problems solved by technology

[0003] Polypropylene filter plate and diaphragm core plate are difficult to manufacture due to their large thickness and large area. Over the years, various manufacturers have used flat vulcanizing machines to mold them. The diaphragm core plate is the main body of the diaphragm filter plate, and the two sides of the diaphragm core plate Weld the diaphragm to form the diaphragm filter plate. It takes 1 hour to 1.5 hours to mold a polypropylene filter plate or diaphragm core plate. The molded polypropylene filter plate or diaphragm core plate blank must be machined before it can be used or transferred to In this way, it takes at least 1.5 to 2 hours to complete the production of a polypropylene filter plate or diaphragm core plate from molding to machining, and there are often many unqualified products, so the production of polypropylene filter plates or diaphragm cores Plate production costs are high and efficiency is low, labor intensity is high and raw materials are wasted, which has been a difficult problem in the production of polypropylene filter plates and diaphragm core plates for many years.