Polyurethane or isocyanurate composite plate and continuous production method thereof in production line

The present invention provides a polyurethane or isocyanurate composite plate and a method for producing the polyurethane or isocyanurate composite plate in a continuous production line. According to the method disclosed by the present invention, by selecting components of a blowing agent composition, foam growth height accounts for at least 65%, preferably at least 75%, of the maximum free foaming height during touch panel time, so that anisotropy of the polyurethane composite plate production in the continuous production line is improved, particularly the compressive strength in a thickness direction and the proportion of the compressive strength in the thickness direction among overall compression strength in three directions are increased, and the dimensional stability of the polyurethane composite plate is improved.