The present invention provides a preparation method of aramid fiber far-infrared emitting paper. In the present invention, para-aramid chopped fiber and para-aramid pulp fiber are used as paper base functional materials with excellent characteristics of high specific strength and high specific stiffness. In addition, the para-aramid chopped fiber and the para-aramid pulp fiber can form a paper material with pores and porous channels, and carbon nanotubes are embedded into the structural pores and porous channels of the paper material. Therefore, the aramid fiber far-infrared emitting paper has better molding quality and composite performance. Results of embodiments indicate that: A far-infrared wavelength emitted by the aramid fiber far-infrared emitting paper provided in the present invention is 4 m to 20 m, a main frequency band thereof is approximately 10 m, and far-infrared conversion efficiency is up to 99%; and the aramid fiber far-infrared emitting paper has tensile strength of 0.12 KN/mm.sup.2 to 0.18 KN/mm.sup.2, and can be bent and folded.

A method for manufacturing a multi-layered paperboard is disclosed, which includes at least two fibrous layers, in which method at least one layer of the multi-layered paperboard is treated by applying an aqueous solution of a first strength component in dissolved form including anionic strength polymer and/or amphoteric strength polymer composition on a surface of layer, and an aqueous solution of a cationic second strength component in dissolved form is added to a fibre stock from which at least one of the fibrous layers joined together is formed.

A method for manufacturing a multi-layered paperboard is disclosed, which includes at least two fibrous layers, in which method at least one layer of the multi-layered paperboard is treated by applying an aqueous solution of a first strength component in dissolved form including anionic strength polymer and/or amphoteric strength polymer composition on a surface of layer, and an aqueous solution of a cationic second strength component in dissolved form is added to a fibre stock from which at least one of the fibrous layers joined together is formed.

Described is a dissolving substrate with a remaining message. The substrate is formed of water-soluble paper such that it dissolves when exposed to water. Notably, printed upon the substrate is an offset printing ink that is water-resistant. Thus, when the substrate dissolves, the message or imagery as printed with the offset printing ink remains and floats upon the water for further use or enjoyment.

The HIGH ALPHA AND HIGH INTRINSIC VISCOSITY PULP PRODUCTION APPARATUSES, METHODS AND SYSTEMS (hereinafter HIGH-A HIGH-IV PULP PRODUCTION) disclosed herein provide for pulp processing used in connection with Kraft Processes (KP) or Pre Hydrolysis Kraft Processes (PHKP), embodiments employing a Cold Caustic Extraction (CCE) stage and/or appropriate washing and bleaching stages, resulting in pulp with high Intrinsic Viscosity (IV) and high purity, such as may be as determined by alpha cellulose content, and adequate brightness for use downstream in applications such as high tensile regenerated cellulose and ether applications, or other applications employing high IV pulp with significant purity (e.g., alpha cellulose>92%).

The HIGH ALPHA AND HIGH INTRINSIC VISCOSITY PULP PRODUCTION APPARATUSES, METHODS AND SYSTEMS (hereinafter HIGH-A HIGH-IV PULP PRODUCTION) disclosed herein provide for pulp processing used in connection with Kraft Processes (KP) or Pre Hydrolysis Kraft Processes (PHKP), embodiments employing a Cold Caustic Extraction (CCE) stage and/or appropriate washing and bleaching stages, resulting in pulp with high Intrinsic Viscosity (IV) and high purity, such as may be as determined by alpha cellulose content, and adequate brightness for use downstream in applications such as high tensile regenerated cellulose and ether applications, or other applications employing high IV pulp with significant purity (e.g., alpha cellulose>92%).

A composition and method for imparting paper and paperboard with resistance to aqueous penetrants using renewable biopolymers, and the resulting paper and paperboard, are disclosed. The renewable biopolymers when combined with water-soluble, hydroxylated polymers or water-soluble salts and applied to the surface of paper or paperboard, results in resistance to aqueous penetrants.

A composition and method for imparting paper and paperboard with resistance to aqueous penetrants using renewable biopolymers, and the resulting paper and paperboard, are disclosed. The renewable biopolymers when combined with water-soluble, hydroxylated polymers or water-soluble salts and applied to the surface of paper or paperboard, results in resistance to aqueous penetrants.

A composition and method for imparting paper and paperboard with resistance to aqueous penetrants using renewable biopolymers, and the resulting paper and paperboard, are disclosed. The renewable biopolymers when combined with water-soluble, hydroxylated polymers or water-soluble salts and applied to the surface of paper or paperboard, results in resistance to aqueous penetrants.

A composition and method for imparting paper and paperboard with resistance to aqueous penetrants using renewable biopolymers, and the resulting paper and paperboard, are disclosed. The renewable biopolymers when combined with water-soluble, hydroxylated polymers or water-soluble salts and applied to the surface of paper or paperboard, results in resistance to aqueous penetrants.