Continuous manufacturing method of lightweight sandwich panel and lightweight sandwich panel manufactured by the method

摘要

The present invention relates to a continuous manufacturing method of a lightweight sandwich panel having an upper and lower cover layer made of wood chips, and an intermediate rigid foam layer disposed between the upper and lower cover layers and thicker than the upper and lower cover layers. A step of preparing the attached wood chip, 2) a step of pressurizing and heating this layer so that the high vapor pressure is enhanced inside the cover layer, and bonding the wood chip, and 3) a panel by the vapor pressure. Tearing the panel at the center to release the pressure on the panel, 4) separating the cover layer so that the intermediate layer can be inserted, and 5) foaming / curing rigid foam to form a rigid foam between the cover layers A step of introducing a system material, 6) a step of bonding the cover layer so that the manufactured panel has a reference thickness, and a step of holding the pressure until the intermediate layer has reacted, and a lightweight sandwich panel And a step to finish.