What details should be paid attention to when designing paper trays? (under)

(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 basic requirement of the structure design of the paper support product is to ensure close contact with the packaged object to prevent the packaged object from causing cross-motion during the circulation process. On this basis, buffering and shock-proof issues are considered, so the size of the structure design is certain To 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 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.

② Demoulding 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 paper support surface. 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°.

③Transition 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.