US Patent 9511568 Non-polyvinylchloride (PVC) tile

In a non-PVC tile, a bottom material layer, a printing layer and a transparent wear-resistant layer are disposed from bottom to top. The printing layer includes an inorganic filling material of 55˜90 percentage weight (wt %). The coefficient of thermal expansion of the bottom material layer and the transparent wear-resistant layer are larger than that of the printing layer. When the bottom material layer, the printing layer and the transparent wear-resistant layer are heated and then cooled, the bottom material layer and the transparent wear-resistant layer symmetrically contract with the printing layer being a center.