6results about "Mechanical/thermomechanical pulp" patented technology

The application relates to the field of packaging materials and specifically discloses a high-strength paperboard which comprises a core layer and a surface layer, the core layer comprises a core outer layer and a core inner layer, the core outer layer comprises the following components: unbleached kraft softwood pulp, cotton pulp, calcined kaolin, carboxymethyl cellulose and cationic polyacrylamide, and the core inner layer comprises the following components: hardwood pulp, mechanical pulp, microfibrillated cellulose and cationic starch. The double-layer differential structure design is adopted, the core outer layer is constructed with a high proportion of unbleached kraft softwood pulp and cotton pulp to form a long-fiber rigid skeleton, the calcined kaolin and the carboxymethyl cellulose are matched to fill the fiber gaps, a main bearing layer with high density and high rigidity is formed, the core inner layer is formed with hardwood pulp, mechanical pulp and microfibrillated cellulose to form a buffer layer with low density and high elasticity, so that the paperboard has excellent compression resistance, bending resistance and impact buffering capacity under the same basis weight, and the warping deformation is inhibited, and the strength, toughness, dimensional stability and cost control are synergistically improved.

The present invention relates to a packaging material for nicotine pouches, comprising cellulose fibers and thermoplastic material fibers, wherein the content of the cellulose fibers is 40% to 80% by weight of the total weight of the packaging material for nicotine pouches, and the content of the thermoplastic material fibers is 20% to 60% by weight of the total weight of the packaging material for nicotine pouches.

There is provided a method of producing a paper- or linerboard having a grammage measured according to ISO 536:2019 of 170-310 g / m2 and comprising a print layer, a middle layer and a back layer, wherein the middle layer is formed from a middle layer furnish comprising at least 25% by dry weight CTMP and the back layer is formed from a back layer furnish comprising an unbleached pulp, such as an unbleached kraft pulp, said method comprising the step of subjecting a multi-layered web at a speed of at least 600 m / min to pressing in a press section comprising a first and a second double-felted shoe press nip arranged in series, wherein the total press impulse of the double-felted shoe press nips is at least 95 kPa*s, preferably at least 100 kPa*s.

A system and process for producing pulp and other bioproducts from non-wood raw materials are described. The non-wood raw materials are screened, desilicated, impregnated, mechanically refined to obtain a pulp stream, and then subjected to oxygen-alkali treatment. Lignin and silica are separated from the pulp stream to obtain pulp. Desilication is carried out at a first temperature using warm water, an alkaline solution, and / or an alkaline liquor with a low alkali charge to selectively separate silica from the non-wood raw materials. Impregnation is carried out at a second temperature using an alkaline solution with a low alkali charge to selectively separate lignin from the non-wood raw materials and prepare the pulp for mechanical refining. The oxygen-alkali treatment is carried out at a third temperature to separate more lignin from the pulp stream.

The invention discloses a method for manufacturing a multi-ply paperboard comprising the steps of: - forming a web comprising at least a top ply, a back ply and a middle ply, wherein the middle ply is formed from a first furnish comprising at least 50 wt% of a CTMP or HT-CTMP, or a mixture thereof, and 0.1–15 wt% of a first fiber-based bulking agent based on the total dry weight of said first furnish, wherein the first fiber-based bulking agent has a Schopper Riegler (SR) value in the range of 70-100 as measured according to ISO 5267-1:1999, a tensile index less than 70 Nm / g as measured according to ISO 1924-3:2011 and an apparent bulk density less than 900 kg / m3 as measured according to ISO 534:2011, - subjecting the thereof formed web to pressing in at least one shoe press, and - drying the web.