According to the performance characteristics of the basic structural elements of the environmental protection paper tray, the structural design of the environmental protection paper tray can be carried out. The main points of the design are analyzed as follows.
(1) Fixed support surface. This is a basic point in the design of the environmental protection paper tray structure. The fixed support surface can be determined according to the requirements of the packaged product, the external dimensions and the internal dimensions of the outer packaging. For example, to design an environmentally friendly paper tray package for electrical products, the length, width and corresponding structural form of the paper tray can be determined according to the outer dimensions of the package and the internal dimensions of the outer packaging, and thus the fixed support of the paper tray can be determined. noodle. At the same time, it is necessary to understand whether the focus of packaging is on strength or on cushioning. The packaging of some heavy and high-strength products focuses on strength, but as a cushioning package, its cushioning performance must also be maintained, while the packaging side of some valuable products The emphasis is on cushioning, and its packaging must also have a certain strength. In the design, the two should be properly combined, and the appropriate base points should be selected according to the shape structure, gravity center and strength of the packaged product, and then the fixed support surface should be determined by these base points.
(2) Cavities and stiffeners. The buffering effect of the paper-plastic paper holder is mainly realized by using the elastic deformation of the paper wall to slow down and offset the external force when it is impacted. The elasticity of the paper-plastic paper support material itself is not high, which mainly depends on the design of the reinforcing ribs of the product and the buffer cavity formed. The basic basis for the design of the cavity and reinforcing ribs is the shape and use of the product itself. In the structure design of the paper support, a cavity is set to ensure the dynamic buffering performance of the paper support, and the reinforcing ribs are set to increase the strength of the paper support itself. Several cavities with simple shapes and good dynamic buffering performance are evenly distributed in the paper support structure, which plays the role of buffering, stabilizing and improving strength. Problems such as strength reduction can be solved by setting up several or symmetrical reinforcing ribs. The setting of cavity and reinforcing ribs should fully consider the problems of convenient production, simple processing, uniform distribution and uniform dispersion of product gravity.
(3) Related parameters. Determine the relevant parameters in the design according to the requirements of the packaged product and the characteristics of the structure design of the paper-plastic-paper-support product.
① Size and wall thickness. The basic requirement for the structural design of the paper-plastic-paper-support product is to ensure close contact with the packaged object to prevent the packaged object from moving in the circulation process. The size must be compact, and the compact size is solved by the comprehensive cooperation of the fixed support surface, the cavity and the reinforcing ribs.
In the structural design, the wall thickness of the paper holder should be determined according to the use conditions of the environmentally friendly paper holder and the type of paper fiber used. The wall thickness is an important factor affecting the strength of the paper holder. The increase of the wall thickness not only increases the consumption of raw materials, but also reduces the production during adsorption molding. The support produces quality defects such as depressions, shrinkage holes and sandwiches. On the premise of meeting the strength of the paper support, the wall thickness should be reduced as much as possible. When the vacuum adsorption molding process is used, the wall thickness is between 0.5–6mm, and when the press-molding process is used, the wall thickness is between 3–20mm.
②Drawing slope. During the forming process of the pulp model, the wet paper mold is closely attached to the screen mold and the paper fibers are embedded in the mesh holes of the screen mold. In order to facilitate the transfer of the wet paper mold, the surface of the paper support parallel to the demoulding direction should be There is a reasonable demoulding slope. The larger the inclination, the more convenient the demoulding is, and the smaller the inclination, the more difficult it is to demould, and the surface of the paper holder will be scratched or broken. Excessive inclination will reduce the dimensional accuracy of the paper support, and also affect the bearing capacity and elastic recovery force of the paper support. The general demoulding slope is 3°–6°.
③Transition arc. In the design of the paper-plastic paper support structure, the corners of the inner and outer surfaces of the paper support, the connection between the vertical rib and the main body, and the terminal of the vertical rib must all use arc transitions to avoid straight edges and right angles. The arc transition is conducive to the manufacture of the mold and the attachment of the mesh, to the demoulding during the transfer of the wet paper mold, to the flow of the liquid material of the pulp model during adsorption and molding, and to avoid damage to the packaging caused by stress concentration. The radius of the transition arc can be determined according to the specific product and paper material properties and the special requirements of packaging, generally 2–5mm.
Post time: Jun-13-2022