The invention relates to fibrous structures having desirable physical properties, such as good tensile strength, low stiffness and high bulk, manufactured using a fiber furnish comprising cellulosic fibers having a pH of 5.0 or less and at least one strength resin. Not only do structures prepared with acidic fibers have desirable physical properties, they may also be manufactured in an energy efficient manner. To achieve the greatest energy savings it is generally desirable that acidic fibers not be subjected to mechanical treatment, such as by refining, prior to forming the fiber into a fibrous structure. Further, it may be desirable to subject the remainder of the fiber furnish to a minimal degree of mechanical treatment, such as by refining, so as to produce a furnish having a freeness greater than about 550 mL.

The present disclosure provides methods and compositions for strengthening paper. The methods may include a step of spraying an anionic polymer onto a paper sheet to increase the strength of the paper sheet. The anionic polymer may have amino groups, amide groups, or a combination of amino groups and amide groups. These groups may be functionalized with an aldehyde. Methods may also include a step of adding a wet end composition to a wet end of the papermaking process.

A method of making an absorbent structure including mixing ultra-high molecular weight (“UHMW”) glyoxalated polyvinylamide adducts (“GPVM”) and/or high molecular weight (“HMW”), glyoxalated polyacrylamide and/or high cationic charge glyoxalated polyacrylamide (“GPAM”) copolymers and high molecular weight (“HMW”) anionic polyacrylamide (“APAM”) with the furnish during stock preparation of a wet laid papermaking process.

A multi-ply through air dried structured tissue having a bulk softness of less than 10 TS7 and a lint value of 5.0 or less. Each ply of the tissue has a first exterior layer that includes a wet end temporary wet strength additive in an amount of approximately 0.25 kg/ton and a wet end dry strength additive in an amount of approximately 0.25 kg/ton, an interior layer that includes a first wet end additive comprising an ionic surfactant, and a second wet end additive comprising a non-ionic surfactant, and a second exterior layer.

A method for manufacturing a multi-layered fibrous web is disclosed, which includes at least two fibrous layers, where each layer is formed from one or more fibre stocks. The fibrous layers are combined prior to subjecting the multilayered fibrous web to wet-pressing and drying. At least one layer of the multi-layered fibrous web is formed from a fibre stock including at least 50 weight-% of a chemi-thermomechanical pulp (CTMP), a hardwood kraft pulp and/or a recycled fibre material calculated from a thick stock applied to a particular layer approach system. A first strength component and a second strength component are added to the fibre stock. The first strength component includes a cationic strength agent and the second strength component includes a synthetic amphoteric polymer composition having a net charge from −3 to +1 meq/g (dry), at a pH of 7.

The present disclosure generally relates to glyoxalated polyacrylamide (GPAM) products, compositions comprising GPAM products, and methods of use thereof, particularly in the paper industry. Moreover, the present disclosure generally pertains to cationic GPAM products, compositions comprising, and use thereof in papermaking applications and in products such as paper-based products, wherein the cationic GPAM products may provide increased wet and/or dry strength to the paper-based product and wherein such GPAMs optionally can be stored and transported to a papermaking site without the addition of large volumes of aqueous carriers.

A method for manufacturing a powdery paper-strengthening agent including a branched (meth)acrylamide-based polymer (A) which includes a step of obtaining (A) component by polymerizing (meth)acrylamide (a1), anionic vinyl monomer (a2), cationic vinyl monomer (a3) and crosslinkable vinyl monomer (a4) in a solvent in a presence of a polymerization initiator, a step of dropping or putting the above (A) component into an organic solvent to form a precipitate, and a step of drying and pulverizing (A) component obtained as the precipitate.

A structured rolled sanitary tissue product having at least two plies, wherein the structured rolled sanitary tissue product has a crumple resistance of less than 30 grams force, a caliper of at least 450 microns/ply, and a bulk softness (TS7) of 10 or less.

The present invention relates to a polymer composition comprising an anionic polymer composite having a synthesized polymer portion and a polysaccharide portion, obtainable by polymerizing vinyl monomers in the presence of the polysaccharide. The present invention further relates to a strength system and methods of production and use in providing a paper product.

Disclosed is an environmentally-friendly method for enhancing mechanical properties of a high antibacterial nano dialysis paper for medical protection, includes following steps: a, preparing pulp components, and taking 40-60 parts of hardwood pulp, 10-20 parts of polyvinyl alcohol fiber, 30-50 parts of softwood pulp, 10-20 parts of cellulose fiber by mass; b, putting the hardwood pulp, the polyvinyl alcohol fiber, the softwood pulp and the cellulose fiber into a beater for beating to make a pulp, and then adding modified chitosan accounting for 1-5% of a weight of the pulp into the pulp, and defibering for 10-20 minutes at a rotating speed of 1500-2000 revolutions per minute in a defibrator; and c, carrying out papermaking with the pulp after defibering to form a dialysis paper finished product.