Low-cost manufacture method of high-quality diaphragm and filter plate

Abstract

The invention relates to a manufacture method of a diaphragm or a filter plate, with low cost and high precision. When a larger die cavity space is left between an upper die and a lower die used for manufacturing the diaphragm or the filter plate, plastics in molten state in an infection machine charging barrel is quantitatively injected into the large die cavity formed by the upper die and the lower die of the die cavity under low pressure through the flow passage in the upper die or the lower die. Then, the periphery of the upper die and the lower die are treated with complete die-closing in closed state under the action of external force, and after the diaphragm or the filter plate in the die cavity is cooled down, the die is opened and the diaphragm or the filter plate is taken out. The method has the advantages that not only the plasticized plastics in the plastic diaphragm cavity are homogeneously extruded to every part of the cavity to be shaped, but also the low-pressure injection molding of the plastics diaphragm is realized and the demand for the mold locking tonnage of a press is reduced, therefore, resource waste and energy consumption are avoided. The method can be suitable not only for thermoplastics and thermosetting plastics, but also for plastic alloy, blending material, recycled thermoplastics, and the like, therefore, the regeneration and reutilization of the resources can be realized.

Description

technical field [0001] The invention relates to a low-cost manufacturing method of a high-quality diaphragm and a filter plate capable of effectively saving resources and producing high-quality diaphragms or filter plates, belonging to the field of filter press diaphragm and filter plate manufacturing. Background technique [0002] The applicant owns CN100360296C, titled "A Method for Forming a Plastic Filter Plate". The filter plate forming mold is located in the hydraulic press and is clamped and opened by the hydraulic press. The hot runner opening of the hot runner plastic filter plate forming mold is located in the hot runner plastic filter plate. On the upper part or bottom or side of the mold, the discharge port of the injection molding mechanism is aligned with the hot runner port, and the hydraulic press is closed. After the plastic raw material is heated and plasticized by the injection molding mechanism, its discharge port passes through the hot runner in the hot r...

AI Technical Summary

Problems solved by technology

[0004] The fly in the ointment of the above-mentioned background technology is: first, the production of the above-mentioned plastic diaphragm or filter plate needs to adopt the hot runner mold, in the large-scale mold, the heat flow guide nozzle needs more, and the mold cost is high; The higher the injection molding power is, the higher the clamping force of the press is, and the resource requirements are higher; the third is to make the plastic fluidity better, and the required material temperature is relatively high. Well, easy to cause plastic aging

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