A kind of preparation method of polypropylene filter plate

Abstract

A preparation method of a polypropylene filter plate, the method is rapid injection molding, including a diaphragm core plate, the material is put into the barrel of a stirring dryer, and the temperature of 70°C is set for drying treatment, and the temperature set by the injection molding machine is The middle of 210°C is 240°C, set the mold clamping and locking twice, set the clamping pressure to 20000KN for the first mold clamping and locking, set the injection feed advance to segmented, and the first setting time is 35 seconds, The injection propulsion pressure is 11.0MPa, the second setting time is 25 seconds, the injection propulsion pressure is 9.0MPa, the third setting time is 20 seconds, the injection propulsion pressure is 7.0MPa, the fourth setting time is 10 seconds, the injection propulsion The pressure is 6.0MPa, the fifth section is the pressure holding section, the setting time is 3 minutes, the pressure holding push pressure is 4.0MPa, the second clamping pressure is 28000KN, the sealing surface slide block is automatically pulled out before the mold clamping, and the mold is cooled. Hold the pressure for 14-16 minutes, the slider will automatically reset when the second filter plate is closed, and the polypropylene filter plate will be injected into the polypropylene filter plate in sequence.

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.