Local thickening method for paper pulp molded product and system thereof

Abstract

The invention discloses a local thickening method for a paper pulp molded product and a system thereof. The method comprises the following steps: firstly, analyzing stress characteristics of the product by using software according to a specific use scene to obtain a Mises stress nephogram of the product; then, according to the distribution of stress dense areas, using a 3D printing process for manufacturing a paper pulp molding net mold with non-uniform mesh sizes, wherein the mesh at the stress concentrated position is smaller; and using the net mold for manufacturing a paper pulp molded product with variable wall thickness, wherein the wall thickness of the finished product at the position with smaller pores is larger than that of the finished product at the position with larger pores. The invention aims to provide the method for manufacturing the paper pulp molded product with the variable wall thickness so as to improve the deformation problem of the existing product and reduce the production cost by improving the process.

Description

technical field [0001] The invention belongs to the technical field of pulp molded products, in particular to a method and system for local thickening of pulp molded products. Background technique [0002] Pulp molding is a three-dimensional papermaking technique. It uses waste paper, bagasse and other plant fibers as raw materials, and molds paper products of a certain shape with special molds on the molding machine. It has the advantages and characteristics of a wide range of raw materials, harmless to the environment, and can be recycled and reused. The molding of pulp molded products mainly depends on the shaping mold to complete. The shaping mold structure includes a punch, a die, a screen die and a heating element. In the forming process, in order to form the liquid pulp and squeeze out the water in the pulp, a mesh mold with the same shape as the concave mold and the convex mold is designed on the concave mold, and the concave mold has drainage and vent holes. When...

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Problems solved by technology

Although the water leakage and exhaust performance of the wire mesh is good, because the compression molding of the flat wire mesh into the mesh with the same shape as the concave-convex mold is done manually, the mesh is not easy to form at the small corners, which limits the pulp molding The molding shape of the product; and the manual welding positioning die is easy to cause inaccurate positioning, repeated rework, low product efficiency, poor forming accuracy, and poor strength; in production, with the continuous mold closing and opening of the upper and lower molds, making The metal mesh between the two is easy to be extruded, worn and broken, which not only increases the production cost, but also reduces the production efficiency due to frequent shutdowns to replace the mesh mold

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