Why does the RV have sandwich structure?
This is because RV is usually composed of "external plate + sandwich material + internal plate" three kinds of material superimposed combination, so called sandwich structure.
First of all, as the body structure to have a skeleton, with wood materials to create the ground and interior walls, with welding to connect the wall components and chassis, the whole car body structure welded, so as to avoid the rv tire pressure to rock bumps and issued a "crunch" sound.
Then it is the middle of the sandwich, bearing heat preservation, sound insulation and other effects, generally filled with polystyrene foam plastic board. The heat preservation effect of heat preservation materials is very important, but the hardness of heat preservation materials is also very important. Trailers also sometimes have leakage problems, such as aging exterior wall materials that can allow rainwater to seeps into the insulation layer. The hardness of XPS (extruded polystyrene) and PU (polyurethane) composites is better than that of a single EPS (polystyrene) foam.
The second is the external materials, generally choose high strength, light weight FRP or aluminum plate.
For external materials, which is better to use FRP or metal aluminum as the outer wall material of the rv?
FRP has the advantage of strong material, not easy to deformation, even under hail, the roof will not leave a dent by impact, so why is the majority of rv with metal aluminum as the outer wall?
Because although FRP has heat insulation, refractory, light weight and other advantages, but it is easy to aging after exposure to wind and sun, so many rv manufacturers at the same time to use these two materials for rv modification: rv facade, side wall cover light metal material, roof using stronger FRP material.
Sandwich body structure is generally used for the side wall and roof of saloon car. Its function is wall support, heat insulation, sound insulation, noise reduction, weight reduction, etc. Because it undertakes so many functions, it is difficult for a single material to meet so many requirements, so the sandwich body structure came into being.