58results about "Mechanical/thermomechanical pulp" patented technology

A method of producing a paper or paperboard product having at least one ply comprising high yield pulp (HYP), comprising the steps of: – providing a furnish comprising at least 50% of high yield pulp (HYP) of a total pulp content in said furnish, said high yield pulp being produced with a wood yield above 85%; – dewatering the furnish to form a moist web and pressing said moist web to a dry solids content of at least 40–70%; and – densifying the moist web to a density above 600 kg / m3 in a press nip of a paper machine at a temperature above a softening temperature of water-saturated lignin comprised in said high yield pulp to provide a paper or paperboard product, containing at least 30% high yield pulp (HYP) of a total pulp content of said product.

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.

There is provided a method of producing a multi-layered liquid packaging board (LPB) comprising a print layer, a back layer and a middle layer, said method comprising the steps of: - providing a maple chemithermomechanical pulp (CTMP) and forming a middle layer furnish comprising the maple CTMP, broke pulp and hydrophobic size; - forming a middle layer web from the middle layer furnish in a forming section of a full-scale paperboard machine; - forming a print layer web from a print layer furnish in the forming section, which print layer furnish comprises hydrophobic size; - forming a back layer web from a back layer furnish in the forming section, which back layer furnish comprises hydrophobic size; and - form a multi-layered LPB from the print layer web, middle layer web and back layer web so that the middle layer is arranged between the print layer and the back layer.

The present invention relates to a method for manufacturing a multi-layer film containing microfibrillated cellulose (MFC) in a paper machine, the method comprising the steps of: a) forming a bottom web layer by applying a first pulp suspension onto a bottom web wire, the first pulp suspension comprising at least 50% by dry weight of a cellulose-based fiber material having a Schopper-Riegler (SR) value in the range of 18 - 75; b) forming or applying an intermediate web layer formed from a second pulp suspension onto the bottom web layer, the second pulp suspension comprising at least 50% by dry weight of MFC having an SR value in the range of 80 - 100; c) applying a top web layer formed from a third pulp suspension onto the intermediate web layer to form a multi-layer web, the third pulp suspension comprising at least 50% by dry weight of a cellulose-based fiber material having a Schopper-Riegler (SR) value in the range of 18 - 75; and d) dewatering and optionally drying the formed multi-layer web to obtain a multi-layer film containing MFC.

According to an exemplary embodiment of the present invention, a method is provided that includes providing a pulp composition, screening the pulp composition to obtain an accept fraction and a reject fraction, and dewatering the accept fraction output from the screening by a screw press.

The invention relates to a light lining board for a corrugated board. The present invention relates to a lightweight liner for a corrugated board, which has good strength properties and reduces the problem of wave-shaped shrinkage in the corrugated board produced therefrom. The liner of the invention comprises at least one sheet layer comprising 20-80% by weight of CTMP from wood fibers and 20-80% by weight of chemical pulp, all percentages being calculated based on the total fiber weight of the first sheet layer wherein the CTMP exhibits a bulk of at least 2.5 cm3 / g.

The present disclosure provides a multilayered paperboard comprising a top layer, a back layer and a middle layer arranged between the top and the back layer, wherein the middle layer comprises refiner mechanical pulp (RMP) fibers in admixture with at least one other type of fibers. A method of producing a multilayered paperboard is also provided.

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.

The invention relates to a mulching film, in particular for a mulching period of at least three months, the mulching film (2) comprising or consisting of a base material (1), wherein the base material (1) is made of mechanically and / or chemically processed cellulose fibers derived from wood, rags, grasses or other vegetable sources, wherein the mulching film (2) has a tensile energy absorption between 250 J / m2 and 400 J / m2. The invention further relates to a use, an arrangement and a method in relation to mulching films.

An absorbent towel paper web having a length and a cross-grain perpendicular to the length, the web comprising: a refined softwood pulp fiber blend comprising about 20% to about 90% softwood pulp fibers by weight based on the dry fiber basis of the paper web, and about 18.5% to about 88.5% softwood pulp fibers by weight based on the dry fiber basis of the tissue paper web (the softwood pulp fibers are optionally refined before being added to the blend); about 0.25% to about 5.0% cationic strengthening polymer by weight based on the dry fiber basis of the tissue paper web; about 10% to about 60% hardwood pulp fiber blend by weight based on the dry fiber basis of the tissue paper web; and about 8% or less moisture by weight; wherein the paper web has a mean square tensile strength in the range of about 6 Nm / g to about 12 Nm / g; and wherein the paper web has a cross-grain wet tensile strength to cross-grain dry tensile strength ratio value in the range of about 0.295 to about 0.35. [Selected Figure] Figure 1

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.

The invention relates to the technical field of preparation of cold film materials, in particular to a cellulose-based radiation refrigeration film material as well as a preparation method and application thereof. Carrying out mechanical treatment on the paper pulp fiber to obtain a paper pulp fiber suspension with a micro-nano fiber structure; mixing the paper pulp fiber suspension with high-reflectivity particles to obtain a paper pulp / high-reflectivity particle mixed solution; mixing wax and the carboxymethyl cellulose solution to obtain a mixture, and sequentially performing heat treatment and emulsification to obtain an emulsion; mixing the paper pulp / high-reflectivity particle mixed solution with the emulsion to obtain a mixture; and placing the mixture in a porous mold to remove a liquid phase, and carrying out hot pressing to obtain the cellulose-based radiation refrigeration film material. The cellulose-based radiation refrigeration film material is efficient, low in cost, capable of being prepared in a large area and high in environmental adaptability, breaks through the limitation of the prior art, has unique performance advantages for reducing the temperature of high-temperature equipment and buildings, and has great strategic significance for promoting energy conservation and emission reduction and achieving the sustainable development target.

The present application addresses the problem of providing a carbon material precursor having, as a main component, cellulose-based fibers that are sustainable biomass resources, the precursor having little shrinkage due to carbonization treatment. The present invention also addresses the problem of providing a method for producing a carbon material that is capable of suppressing shrinkage due to carbonization even when a precursor having cellulose-based fibers as the main component is used. A carbon material precursor is prepared from an unfired fiber mixture containing cellulose fibers and synthetic polymer fibers, the content of the cellulose fibers in the unfired fiber mixture being 50% by weight or more, and the content of the synthetic polymer fibers in the unfired fiber mixture being 5% by weight or more but less than 50% by weight. The synthetic polymer fibers have a higher thermal decomposition temperature than the thermal decomposition temperature of the cellulose-based fibers and do not melt at or below the thermal decomposition temperature of the cellulose-based fibers. A carbon material is obtained by firing such a carbon material precursor.

The invention relates to a packaging material for a nicotine bag. The packaging material comprises cellulose fibers; the packaging material for the nicotine bag comprises cellulose fibers and thermoplastic material fibers, the content of the cellulose fibers is 40-80 wt% of the total weight of the packaging material for the nicotine bag, and the content of the thermoplastic material fibers is 20-60 wt% of the total weight of the packaging material for the nicotine bag.

The present invention relates to a method for producing a film comprising microfibrillated cellulose, the method comprising providing a suspension comprising 30-100% by weight of microfibrillated cellulose based on total dry weight; forming a wet web of the suspension by casting on a substrate, which is a non-porous substrate, paper, or paperboard; wet-pressing the wet web to form a dewatered web, comprising applying a press fabric in direct contact with the wet web and passing the wet web disposed between the press fabric and the non-porous substrate through a press apparatus; smoothing the dewatered web by applying at least one smoothing press to the dewatered web disposed on the non-porous substrate to form a smoothed web, wherein a pressure of 0.1-25 MPa is applied to each smoothing press, and when applying the smoothing press(es), the dewatered web has a dry content of 20-60% by weight; and drying the smoothed web to form the film. The present invention further relates to a film.

The invention discloses a method for manufacturing a multiply paperboard comprising the steps of: - forming a web comprising at least a top ply, a back ply, and a middle ply arranged between the top ply and the back ply, wherein the middle ply is formed from a first furnish comprising at least 50 wt% of a HT-CTMP and 0.1 – 10 wt% of glue pulp based on the total dry weight of said first furnish, wherein said glue pulp has a Schopper Riegler (SR) value in the range of 55- 84 as measured according to standard ISO 5267-1 and a mass fraction of fines of less than 25% as measured according to standard ISO 10376:2011, - subjecting the thereof formed three-ply web to pressing in at least one shoe press, and - drying the web. It has been found that the combination of using the said furnish mixture including HT-CTMP and glue pulp with an SR value within said range enables efficient dewatering by use of a shoe press and gives rise to a paperboard with high bulk but maintained or improved strength properties.

The invention relates to a method for manufacturing calendered glassine paper having a basis weight in the range of 40 to 120 g / m2, wherein an optimal combination of non-recycled BCP, BCTMP and recycled pulp obtained from release liner glassine paper is used to adjust the properties of the fiber furnish. While the use of BCTMP enables a product having a higher bulk, the recycled pulp component, which has high compatibility with the paper manufacturing process, enables to balance the manufacturing process and reduce the dimensional changes and shrinkage of the formed paper. The combined presence of the BCTMP and the recycled pulp component in the fiber furnish improves the water removal from the fibers during the glassine paper manufacturing, while the presence of non-recycled BCP produced from softwood improves the formation and runnability of the paper web on the paper machine. This enables to produce calendered glassine paper with improved sustainability, wherein the density may be controlled by means of the fiber furnish, without downgauging and without adverse effects to other paper properties, which would prevent the use of the calendered glassine paper as substrate layer in a release liner.

The present invention relates to the field of hydrophobic paper production. In particular, a method of producing hydrophobic paper, using a sizing additive comprising a water-soluble chemically modified kraft lignin and a multivalent metal salt is described. The invention further relates to a hydrophobic fiber-based product, such as a paper product obtainable by such method, and to the use of the sizing additive and metal salt in the production of hydrophobic fiber-based products, such as paper products.

There is provided a method of producing a multi-layered liquid packaging board (LPB) comprising a print layer, a back layer and a middle layer, said method comprising the steps of: - providing a maple chemithermomechanical pulp (CTMP) and forming a middle layer furnish comprising the maple CTMP, broke pulp and hydrophobic size; - forming a middle layer web from the middle layer furnish in a forming section of a full-scale paperboard machine; - forming a print layer web from a print layer furnish in the forming section, which print layer furnish comprises hydrophobic size; - forming a back layer web from a back layer furnish in the forming section, which back layer furnish comprises hydrophobic size; and - form a multi-layered LPB from the print layer web, middle layer web and back layer web so that the middle layer is arranged between the print layer and the back layer.

The present invention relates to a method for producing a film comprising microfibrillated cellulose, which comprises: providing a suspension comprising 30-100 weight-% microfibrillated cellulose based on total dry weight; forming a wet web of said suspension by casting on a support being a non-porous support, paper or paperboard; wet-pressing said wet web to form a dewatered web, which comprises applying a press fabric into direct contact with said wet web and conducting said wet web, arranged between said press fabric and said non-porous support, through a pressing equipment; smoothening said dewatered web by applying at least one smoothing press to said dewatered web arranged on said non-porous support so as to form a smoothened web, wherein a pressure of 0.1-25 MPa is applied in each smoothing press, wherein said dewatered web has a dry content of 20-60% by weight when applying said smoothing press(es), and drying said smoothened web to form said film. The invention further relates to a film.

The present invention relates to lignocellulosic nanofibres (LNFC) or biopolymeric reinforcing nanoadditive as a mechanical reinforcement of low-molar-ratio phenol formaldehyde (PF) and urea formaldehyde (UF) thermosetting adhesives, wherein the use of natural nanocompounds based on lignin and cellulose makes the nanoadditive or nanofibre a "green" or environmentally friendly additive, said additive being useful in the production of wood-based composites. The LNFCs are made by means of a process that does not involve chemical additives and which is based on thermomechanical wood pulp, using microshredding and high-pressure microfluidsation. The present natural nanoadditive or natural reinforcement fibre is intended for the industry of manufacturing plywood, medium density fibreboard (MDF) and particleboard.

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.

The application discloses a method for producing paper pulp by using poplar and wheat straw, the obtained paper pulp and application of the paper pulp. The method comprises the following steps: S1, cutting straw; S2, crushing; S3, separating; S4, adding back water to soak the raw material for pulping; S5, first water squeezing; the soaked raw material for pulping is subjected to water squeezing to obtain the raw material for pulping after water squeezing treatment; S6, first pulping; S7, softening reaction; S8, second water squeezing; S9, second pulping; S10, bleaching to obtain bleached paper pulp; and S11, third water squeezing, that is, the bleached paper pulp is subjected to water squeezing to obtain paper pulp products. The pulping process does not need high temperature, does not need to add heat, does not need to be subjected to water treatment, is environment-friendly and low in production cost.

Systems and processes are described for producing pulp and other bioproducts from non-wood feedstock. Non-wood feedstock is screened, desilicated, impregnated, and mechanically refined to obtain a pulp stream which is then subjected to oxygen-alkali treatment. Lignin and silica are separated from the pulp stream to obtain the pulp. Desilication is performed at a first temperature with hot water, an alkaline solution, and / or an alkaline liquor having a low alkali charge to selectively separate silica from the non-wood feedstock. Impregnation may be performed at a second temperature with an alkaline solution having low alkali charge to selectively separate lignin from the non-wood feedstock and prepare the pulp for mechanical refining. The oxygen-alkali treatment is performed at a third temperature to separate more lignin from the pulp stream.

The invention provides a paper product, enhanced alkaline hydrogen peroxide mechanical pulp and a preparation method of the enhanced alkaline hydrogen peroxide mechanical pulp. The enhanced alkaline hydrogen peroxide mechanical pulp comprises alkaline hydrogen peroxide mechanical pulp and an enhancer, the reinforcing agent is obtained by carrying out surface modification on nano cellulose, and a surface modification material comprises any one or more of a silane coupling agent, polyvinyl alcohol, polylactic acid and polystyrene. According to the enhanced alkaline hydrogen peroxide mechanical pulp, the contradiction between dispersity and strength improvement is solved through collaborative optimization of a nano material surface modification material and an APMP pulping process; a silane coupling agent and the like are used for performing surface modification on the nano material, so that the surface energy of the nano material can be reduced, and the dispersity and compatibility of the nano material in the APMP mechanical pulp can be improved; according to the present invention, the nanometer material can be uniformly distributed among the fibers, such that the strength of the APMP mechanical pulp is effectively improved, and the key performance indexes such as the tensile strength and the bursting strength of the paper are significantly improved while the dispersion problem of the nanometer material in the APMP mechanical pulp is solved.

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 provides a low-cost method for preparing wood fiber pulp from brush wood, and belongs to the technical field of papermaking. The preparation method comprises the following steps: S1, activating treatment; s2, primary defibering; s3, primary chemical impregnation; s4, carrying out microfibrillating treatment; s5, secondary chemical dipping; s6, primary grinding; s7, whiteness regulation and pH balance; s8, accurate grinding; and S9, finished product refining and screening. One of poplar, white wax, platanus orientalis, birch and pine and a mixture of the poplar, the white wax, the platanus orientalis, the birch and the pine are used as raw materials, and the performance indexes such as the bulk, the tensile index and the burst index of the prepared paper can be adjusted according to requirements through the process steps of chemical dipping treatment, microfibrillation treatment, accurate grinding and the like. Therefore, the pulp has high adaptability under different production requirements, and has remarkable advantages in the aspects of improving the utilization rate of fiber resources, reducing environmental pollution, reducing the investment cost, improving the quality of the pulp and the like.