14results about "Fibrous raw materials" patented technology

There is provided a bleached high temperature chemithermomechanical pulp and a method for producing said HT-CTMP comprising the steps: a) providing wood chips comprising softwood, hardwood or mixtures thereof; b) impregnating the wood chips with an impregnation liquid comprising NaOH and / or Na2SO3 to obtain impregnated chips; c) transferring the impregnated chips to a heating zone without compressing the impregnated chips; d) heating the impregnated chips in the heating zone with steam having a temperature of above 140 °C, such as at least 150 °C, such as at least 160 °C, to obtain pre-treated chips; e) defibrating the pre-treated chips to obtain a pulp; f) bleaching the pulp to obtain a bleached pulp; and g) refining the bleached pulp at a consistency of 3-8 wt. % to obtain bleached HT-CTMP.

A refiner disc of a refiner (100) for refining of lignocellulosic material, said refiner disc (30) having an active surface (1; 1') comprising a pattern of bars (10) and grooves (20) disposed in a number of pattern areas (41; 41'), wherein said pattern areas (41; 41') are positioned side by side with each other to cover at least a part of the active surface (1; 1'). Each of said pattern areas (41; 41') has a length, l, extending between a first end (43a) and a second end (43b) of the pattern area (41; 41') and a width, w, extending between two side edges (45a, 45b) of the pattern area, wherein a distance between the two side edges (45a, 45b) is smallest in the first end (43a) of the pattern area (41; 41') and is increasing towards the second end (43b) of the pattern area. Each of said pattern areas (41; 41') is positioned on the active surface (1; 1') such that a centre line, c, of the pattern area (41; 41') is provided at an angle, p, to a radius, R, of the refiner disc (30), said angle, p, being between 10-60°.

The application provides a low-temperature and clean pulping method of wheat straw biomechanical pulp, and relates to the field of low-temperature wheat straw biomechanical pulp. The low-temperature and clean pulping method of the wheat straw biomechanical pulp comprises the following steps: extrusion and wire twisting, first pre-steaming, first mechanical treatment, second pre-steaming, second mechanical treatment and post-treatment. The low-temperature and clean pulping method of the wheat straw biomechanical pulp can effectively reduce steam consumption, improve treatment efficiency, increase yield, improve pulping uniformity, avoid water treatment defects and loss of fine fibers in the pulping process, reduce treatment cost, and improve the cleanliness and environmental protection of pulping.

This disclosure provides a grinding disc (1) for fine grinding of lignocellulosic materials. The grinding disc (1) has a surface comprising a plurality of cutting teeth (10) extending in a direction between the inner periphery (17b) and the outer periphery (17a) of the grinding disc (1). j ), and multiple paddle stops (11 i Each baffle is located in the corresponding pair of adjacent cutter teeth (10). k 10 K+1 The grinding disc (10) extends between the two sides. The grinding disc (11) of the fine grinding mill includes at least one slurry baffle (11). p ), the slurry baffle (11) p The grinding disc (1) includes a curved side (11c) facing the inner periphery (17b) of the grinding disc (1). The curved side (11c) has a concave curvature relative to the inner periphery (17b), thereby allowing the grinding disc (11) to be positioned within the grinding disc. p ) and corresponding pairs of adjacent cutting teeth (10 k 10 k+1 A circular portion is formed within the area (20) defined by the slurry. Additionally, at least one slurry baffle (11) p The grinding disc is a three-dimensional extended body. The circular portion generated by the concave curvature gives the grinding disc of the fine grinding mill more robustness. This disclosure also provides a fine grinding mill disc including such a fine grinding mill disc. This disclosure further provides a fine grinding mill having at least one such fine grinding mill disc.

Disclosed is mechanical and decolorization pretreatment of cotton-containing textiles, such as "trash" feedstock in terms of end-of-life-cotton textiles, that may be used to produce sugar without the use of harsh pretreatments conditions.

The invention relates to a grinding tool for producing a fibre material from plants with a high proportion of silicate for the production of paper and card, said grinding tool having at least one stator disc (10) with elevations (12) and notches provided therein in the form of first and second slits (14, 16), which together form cutting edges for comminuting the plants, wherein the upper side of the elevations (12) has a hard material layer (20). The invention also relates to a method for producing a fibre material from plants with a high proportion of silicate for the production of paper and card by means of such a grinding tool.

This invention relates to the field of papermaking waste recycling and treatment technology, and provides a dual-channel collaborative sorting method and system for mixed-form pulp raw materials. The method includes: acquiring mixed pulp raw materials; dividing the mixed pulp raw materials into a first material stream and a second material stream based on physical morphological decomposition; sequentially performing a thermal interface weakening step and a differential friction shearing step on the first material stream to reduce the interfacial bonding strength between the film layer and the paper fiber layer and to peel off the film layer; performing a dry purification step on the second material stream; and dynamically adjusting the process parameters of the thermal interface weakening step and the differential friction shearing step based on the processing feedback of the first material stream through a control unit. This invention achieves differentiated collaborative processing of raw materials with different forms, effectively solving the problems of incomplete film-paper peeling and fiber damage, significantly reducing plastic residue and ash content, and improving the quality of recycled pulp.

The application belongs to the technical field of artificial board preparation, and discloses an environment-friendly fiber board based on fiber raw material grading treatment and a preparation method thereof, wherein the preparation method comprises the following steps: screening and grading wood fibers to obtain coarse fibers, medium fibers, fine fibers and fine powder; obtaining soft hackled fiber based on the fine fibers; obtaining nano-cellulose based on the fine powder; obtaining bark raw material based on the bark; pyrolyzing the bark raw material to obtain water-containing phenol-rich oil; mixing the water-containing phenol-rich oil and the nano-cellulose and then performing shearing and stirring to obtain a phenol-rich emulsion; and obtaining the environment-friendly fiber board based on the coarse fibers, the medium fibers, the soft hackled fiber and the phenol-rich emulsion; the application can achieve "zero" formaldehyde release, has significant environmental protection, and realizes waterproof and moisture-proof without adding traditional wax components.

The present invention relates to a multi-ply liner for use as a packaging material for food or beverages, the multi-ply liner comprising a first ply and a second ply, wherein the first ply comprises at least 70 wt% unbleached kraft pulp and less than 30 wt% neutral sulfite semi-chemical (NSSC) pulp based on dry weight, and the second ply comprises at least 50 wt% NSSC pulp and less than 50 wt% unbleached kraft pulp based on dry weight, and the NSSC pulp in the second ply is a washed NSSC pulp having an ash content of less than 1.8 wt% determined in accordance with ISO standard 1762:2019. The present invention further relates to a method for manufacturing the multi-ply liner.

The application discloses a superfine bamboo fiber powder grinding process and belongs to the technical field of bamboo-based new material processing. The process comprises four steps of dry rough grinding, microbial fermentation pretreatment, emulsification wet grinding nanocrystallization and drying post-treatment. The lignin is selectively degraded by white rot fungus complex flora, so that the porosity of bamboo powder is increased by more than 50%. In combination with mineral auxiliary emulsification wet multi-stage series grinding and real-time laser particle size feedback control, superfine bamboo fiber powder with D90 less than or equal to 800nm is prepared. The process is green and environmentally friendly, and the cost is reduced by 30%-50% compared with traditional dry grinding.

The present application relates to the field of degradable new materials, in particular to a mulching paper using lignin and a production method thereof, specifically, lignin, a biomass material, is applied to the production of the mulching paper, wherein the paper is mainly made of unbleached conifer chemical pulp and unbleached broadleaf chemical pulp as paper fiber raw materials, and a coating mainly made of lignin is coated on the surface of the paper, the coating can simultaneously play the roles of sterilization and bacteriostasis, improving the disease resistance of crops, inhibiting weeds, improving the water resistance, improving the physical strength, solving the problem that traditional mulching films cannot be degraded, and achieving the use effect even better than that of ordinary mulching films.

A process for producing mechanical wood pulp is provided, wherein the process comprises a step of grinding optionally pretreated wood chips in a refiner unit at an operating temperature of at least 155°C, a bleaching formulation is added prior to and / or during the grinding step, and the bleaching formulation comprises (A) a salt of the dithionous acid H2S2O4, and (B) a salt comprising a polyanionic component having at least 5 anionic units, selected from a COO- group and a PO3 - group.

The present invention relates to a method and an apparatus (1) for dry manufacturing rigid cellulose product (2) having essentially non-flat general shape from a cellulose blank (10). The method comprises the steps of providing a cellulose pulp sheet (7), disintegrating the cellulose pulp sheet (7) in order to generate a quantity of separated cellulose fibres, forming a cellulose blank (10) in the cellulose blank forming unit (9), transferring the cellulose blank (10) to a product forming unit (11), and producing rigid cellulose products (2) in the product forming unit (11), wherein the product forming unit (11) comprises heating means for heating the cellulose blank (10) to a forming temperature T, the product forming unit (11) comprising a moulding tool having a first mould part (15) and a second mould part (16), wherein the heated cellulose blank (10) is pressed between the first mould part (15) and the second mould part (16) by applying a forming pressure P in the axial direction of the moulding tool. The primed cellulose pulp sheet (7) has an added barrier dispersion (34) that comprises deionized water (35), a barrier additive (36), including water, a barrier agent and a cationic stabilizer, and a wet strength additive (37), including water, and a wet strength agent, wherein the total amount of barrier agent, cationic stabilizer and wet strength agent is in the range 5-20 wt% of the barrier dispersion (34), the ratio between the wet strength agent and the barrier agent being in the range 1:2 – 2:1.