What details should be paid attention to when designing paper trays?
According to the performance characteristics of the basic structural elements of the paper tray and environmental protection paper tray, the structure design of the paper tray can be carried out. The analysis of the design points is as follows.
(1) Cavity and ribs. The cushioning effect of the paper tray is mainly realized by offsetting the external force by the elastic deformation of the paper wall when it is impacted. The elasticity of the paper tray material itself is not high, mainly depends on the product's stiffener design and the cushioning cavity formed. The design of the cavity and stiffeners plays a vital role in the elastic deformation of the paper tray, that is, the cushioning capacity. , And the basic basis for the design of the cavity and the ribs is the shape and purpose of the product itself. In the paper support structure design, a cavity is provided to ensure the dynamic cushioning performance of the paper support, and the reinforcement ribs are provided to increase the strength of the paper support. Several cavities with simple shapes and good dynamic cushioning performance are evenly distributed in the paper support structure to buffer, stabilize and improve the strength. For large-area cavities, the structure of the paper support structure is unstable and the strength is reduced. Several or symmetrical reinforcement ribs can be installed to solve such problems. The cavity and reinforcement ribs should be set up to fully consider the problems of convenient production, simple processing, uniform distribution, and uniform distribution of the gravity of the product.
(2) Fix the supporting surface. This is the most basic point in the design of the paper support 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 a paper tray package for electrical products, you can determine the length, width and corresponding structural form of the paper tray according to the external dimensions of the package and the internal dimensions of the outer packaging, and determine the fixed supporting surface of the paper tray. . At the same time, it is necessary to understand whether the focus of packaging is strength or 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, and the packaging side of some valuable products The focus 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 and structure of the packaged product, the center of gravity and the strength, and then the fixed support surface should be determined by these base points.
(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 support product.
①Size and wall thickness. The most basic requirement of the structure design of paper support products is to ensure close contact with the packaged objects, and prevent the packaged objects from causing cross-motion during the circulation process. On this basis, buffering and shockproof issues are considered. Therefore, the size in the structural design It must be compact. 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 support should be determined according to the use conditions of the paper support and the type of paper material fiber used. Wall thickness is an important factor affecting the strength of the paper support. The increase in wall thickness not only increases the consumption of raw materials, but also reduces production during adsorption molding. The increase in wall thickness will also increase the energy consumption of the wet paper mold drying process, and it is easy to make the paper Quality defects such as dents, shrinkage holes, and sandwiches are generated in the tray. Under the premise of meeting the strength of the paper support, the wall thickness should be reduced as much as possible. The wall thickness is between 0.5-6mm when the vacuum adsorption molding process is used, and the wall thickness is between 3-20mm when the compression molding process is used.
②Transition arc. In the design of the paper support structure, the corners of the inner and outer surfaces of the paper support, the connection between the vertical ribs and the main body, and the ends of the vertical ribs must all be transitioned with arcs to avoid straight edges and right angles. The arc transition is conducive to the manufacture of molds and the attachment of the net, the demolding during the transfer of wet paper molds, the flow of the pulp liquid material during adsorption molding, and it is also beneficial to avoid stress concentration causing packaging damage. The radius of the transition arc can be determined according to the specific product and paper properties and the special requirements of packaging, generally 2-5mm.
③ Demolding slope. In the paper mold forming process, the wet paper mold is tightly attached to the mesh mold and the paper fiber will be embedded in the mesh of the mesh mold. In order to facilitate the transfer of the wet paper mold, the surface of the paper support parallel to the demolding direction should be There is a reasonable draft angle. The larger the inclination, the easier it is to demold. If the inclination is too small, it will be difficult to demold, and it will also cause scratches or cracks on the surface of the paper support. Too large a slope will reduce the dimensional accuracy of the paper tray, and also affect the load-bearing capacity and elastic restoring force of the paper tray. Generally, the draft angle is 3°--6°.
