Influence of Sheet Type, Layout, and Height of Cardboard Tubes as Cores on the Mechanical Properties of the Sandwich Panel

The increasing demand for durable and lightweight raw materials in home and office furniture makes it necessary to investigate and optimize their properties. In this study, the effect of the sheet type, layout, and thickness were investigated on the mechanical properties of lightweight sandwich panels. Two types of sheets were used for making sandwich panels; medium density fiberboards and particle boards with a thickness of 8 mm and cores made of tube (bobbins) cardboard with heights of 30 and 50 mm, in three types of layouts. Urea formaldehyde glue was selected. The bending stiffness and modulus of elasticity were evaluated according to ASTM C 393 and impact strength according to DIN 5218 1992. The results showed that the thickness of the core had a significant effect on the mechanical properties, so that with increasing the thickness of the core, bending stiffness and modulus of elasticity decrease, but impact strength increases. The best results came from specimens made with a 30mm thick, medium density fiberboard core and a Type A layout.