Paper and paperboard products

The present invention is directed to products， such as paper and paperboard products， comprising a substrate containing cellulose and top ply comprising microfibrillated cellulose and inorganic particulate， to methods of making such paper and paperboard products， and associated uses of such paper and paperboard products. The microfibrillated cellulose and inorganic particulate material are applied at the stage when the wet substrate is in the process of being formed on the wire of a papermaking machine， thereby avoiding the additional cost of more extensive equipment and machinery as well as in separate drying of a coating. The microfibrillated cellulose facilitates the application of inorganic particulate onto the surface of a wet paper or paperboard substrate when applied thusly， by trapping the inorganic particulate on the surface of the substrate and by giving the composite sufficient strength and a suitable pore structure to make it suitable for printing and other end-use demands.

本发明涉及纸及纸板类产品、制备此类纸及纸板产品的方法，以及此类纸和纸板产品的相关应用。其中，所述纸及纸板产品包含含有纤维素的基材，以及由微纤化纤维素（microfibrillated cellulose）与无机颗粒构成的表层。本发明将微纤化纤维素与无机颗粒物料施加工序设置于湿基材在造纸机网部成型的阶段，由此可避免购置更复杂设备与机械产生的额外成本，同时省去了单独对涂层进行干燥的步骤。通过将无机颗粒截留于基材表面，并赋予该复合材料足够的强度与适宜的孔隙结构，使其适配印刷及其他终端使用需求，微纤化纤维素可在上述施加工艺下，辅助无机颗粒附着于湿纸或纸板基材的表面。