A double-layer cushioning structure and a preparation process thereof, relating to technical field of packaging products. It includes a buffer cover. Hollow double-wall structure in buffer cover play a good buffer role, when an outer wall is deformed inwards by impact of external force, reactive force will offset impact of external force to achieve buffer effect; first reinforcing ribs and second reinforcing ribs strengthens strength of inner and outer walls, thereby reducing wall thickness, softening product, and saving processing materials; first connecting holes, second connecting holes, and support holes between inner and outer walls can better support inner and outer walls, and longitudinally strengthen buffer cover, and further ensure overall structural strength of buffer cover; soft material is provided on a wall surface of a product protection groove, to further soften wall surface in contact with the product to protect surface of product from being scratched.

An acoustic attenuation panel with at least one acoustically resistive layer, at least one reflective layer, at least one cellular structure and at least one C-shaped reinforcement which are interposed between the acoustically resistive and reflective layers, and at least one expandable core, positioned between the first and second wings of the C-shaped reinforcement, which increases in volume during a polymerization cycle. Also a method for manufacturing such a panel.

A ventilated structural panel comprising a first sheet, having a long axis defining a length and a perpendicular short axis defining a width, a plurality of spacing structural elements, fixedly attached to the first sheet such that the yield strength of the panel is greater than the individual yield strength of the first sheet, and the plurality of spacing structural elements being formed such that a plurality of unobstructed pathways are created for air to move from at least one edge of the panel to at least one of an opposite and an adjacent edge of the panel, wherein the first sheet is the only sheet in the panel.