19results about "Waste paper working-up" patented technology

The present invention generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof. In particular, the disclosure provides methods for enhancing retention and drainage by addition of a retention and drainage aid comprising quick inversion cationic emulsion polyacrylamides (QIC-EPAMS) and polyvinylamine (PVAm) polymers Preparation of paper sheets under these conditions provides improved retention, gravimetric drainage rates, and DDA drainage time, without over-flocculation and allowed for significant decrease in PVAm dosage.

The invention related to an apparatus for recycling of lignocellulosic fibres from a fibreboard (10) comprising compressed lignocellulosic fibres bonded together by a binding agent. The apparatus (100) comprises a transport device (110) arranged within a closed housing (111), wherein the housing (111) is arranged for steaming pieces (11) of the fibreboard (10) at super-atmospheric pressure to decompress and release the lignocellulosic fibres by hydrating them, as well as hydrolysing the binding agent, and the transport device (110) is arranged for transporting the fibreboard pieces (11), upon being steamed, from an inlet (116) of the housing (111), at which the fibreboard pieces (11) are fed to the housing (111), to an outlet (118) of the housing (111), at which steamed portions (12) comprising released lignocellulosic fibres exit the housing (111). Further, the apparatus comprises a steam generator (160) in communication with the housing (111), whereby the fibreboard pieces (11) may be steamed at super-atmospheric pressure in the housing (111) to provide the steamed portions (12) comprising released lignocellulosic fibres, an inlet pressure lock (120) configured to receive the fibreboard pieces (11) at atmospheric pressure and to deliver them to the housing (111), via the inlet (116), at super-atmospheric pressure, and an outlet pressure lock (130) configured to receive steamed portions (12) comprising released lignocellulosic fibres via the outlet (118) and ejecting recycled lignocellulosic fibres (13) during a sudden expansion of super-atmospheric pressure.

This application relates to a continuous pulping method for high wet strength waste paper and a horizontal tube continuous digester. The method involves continuously feeding shredded high wet strength waste paper into a horizontal tube continuous digester with an aspect ratio of 8:1, where it is mixed with water and PAE crosslinking breaking agent to form pulp. Steam is directly introduced into the reactor for heating, and a central rotating shaft with a shearing plate is driven to rotate at a low speed of 5-15 r / min, applying continuous and gentle mechanical agitation and shearing to the pulp. The pulp is then continuously processed and discharged. This application achieves an effective synergy between high temperature, chemical degradation, and mechanical shearing, breaking through the inefficiency bottleneck of traditional intermittent hydraulic pulping. It not only achieves continuous and efficient production but also effectively improves fiber dissociation rate and significantly reduces unit energy consumption and loss of pulp physical strength.

A method for controlling papermaking, comprising: monitoring the liquid level of a fibrous suspension in a reservoir (302); identifying that the liquid level has dropped so as to meet at least one empty criterion (303), and then identifying that the liquid level has risen so as to meet at least one replenishment criterion; and starting to administer a biocide to the fibrous suspension flowing into the reservoir in response to identifying that the liquid level has risen so as to meet at least one replenishment criterion. A corresponding device and computer program are also disclosed.

This invention discloses an ultra-thin, highly water-resistant, biodegradable crepe paper mulch film and its preparation method, aiming to replace traditional plastic mulch film, solve the problem of agricultural mulch film pollution, and promote the development of organic agriculture. This paper mulch film consists of layers of topcoat and core pulp. The topcoat is mainly composed of corn starch, silicone water-resistant agent, and water (by weight, 5-10 parts, 2-6 parts, and 84-93 parts, respectively). The silicone water-resistant agent contains carboxyl groups, alcohol hydroxyl groups, and polysiloxane oxygen-containing functional groups, possessing both excellent water resistance and environmental friendliness. The basis weight of the topcoat is 2-3 g / m². The core pulp is made from 100% unbleached recycled fiber, with a basis weight of 30-38 g / m². The paper mulch film has a wrinkling rate of 10-20%. The paper mulch film has excellent technical indicators: thickness 1.5-2.5 mm / 16 ply, longitudinal elongation 6-15%, longitudinal tensile strength 12000-20000 mN, longitudinal wet strength 4000-8000 mN, water absorption 20-35 g / m² (3 layers for 60 seconds), and visible light transmittance 0.3-1.5%. Its low cost, combined with high water resistance, good elasticity and biodegradability, makes it an ideal upgrade solution for the agricultural mulch film industry.

The present invention relates to an apparatus (1) for use in cellulose hydrolysis. The apparatus (1) comprises a channel (10) for guiding a stream of cellulose-containing waste in a flow direction (FD); one or more cylinder(s) (20) arranged to rotate around an axis (A), such that, when rotated, one or more side surfaces (21) of said cylinder(s) (20) exhibit a linear velocity vector orthogonal to said axis (A); and one or more complementary surfaces that face said side surfaces (21), such that, when the cylinder(s) (20) are rotated, the side surfaces (21) and complementary surfaces cooperate in grinding the waste. The present invention further proposes a respective method for cellulose hydrolysis.

The application discloses a kind of damp-proof flame-retardant corrugated paperboard and preparation process thereof, belong to paperboard technical field, to solve the technical problems that damp-proof performance, flame-retardant performance and flat pressure strength of corrugated paperboard in prior art need to be further improved, specifically including first plant fiber and waste carton are mixed, and after infiltration, deinking agent is crushed, then with functional inorganic filler, phosphoric acid modified piperazine and preservative are mixed and stirred, are sent into paper machine and are beaten, are formed, are dehydrated, are dried, and are pressed into B type wave-shaped corrugated, after cooling roll shaping, adhesive is evenly coated on the peak tip of corrugated core by roll coater, face paper is pasted on both sides of corrugated core, drying is obtained, and corrugated paperboard is obtained.The application is by the synergistic effect between modified calcium carbonate, modified silicon dioxide, modified aluminum oxide, phosphoric acid modified piperazine and polyurethane emulsion, further improve the damp-proof performance, flame-retardant performance and flat pressure strength of corrugated paperboard.

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.

This invention discloses a production process for high-fold-resistance corrugated base paper, specifically relating to the field of corrugated paper production technology. The process includes mixing different types of waste paper raw materials through hydraulching to obtain raw waste paper pulp with a concentration of 2.5-2.8%; passing the raw waste paper pulp through high-consistency desanding, coarse screening, and low-consistency desanding before entering a grading screen to separate the fibers in the waste paper pulp into long fibers and short fibers; mixing the long fiber pulp and short fiber pulp in a certain proportion for papermaking and surface sizing; wherein, papermaking includes wire forming, pressing and dewatering, and pre-drying to obtain initial corrugated base paper with a dryness of 90-92%; then, surface sizing is performed on the initial corrugated base paper with boiled sizing solution, followed by drying at 60-100℃ to a dryness of 85-92%, and finally curling and slitting to obtain high-fold-resistance corrugated base paper. This invention achieves stable production of high-fold-resistance corrugated base paper through diversified raw materials, refined fiber processing, flexible control of the papermaking process, and precise preparation of the sizing solution.

This utility model relates to a white pulp production system for A3 grade kraft paper, comprising: a chain conveyor for conveying white pulp residue recovered from a wastewater treatment plant to a pulper; a pulper for pulping the white pulp residue conveyed by the chain conveyor and then sending it to a high-consistency desander; a high-consistency desander for removing desander from the pulper and then sending it to a discharge pulp tower; a discharge pulp tower for storing the pulp after desandering by the high-consistency desander; a discharge pump for sending the pulp in the discharge pulp tower to a low-consistency desander; a low-consistency desander for removing desander from the pulp conveyed by the discharge pump and then sending it to a thermal dispersion system; a thermal dispersion system for thermally dispersing the pulp and then sending it to a medium-fiber storage tower; and a storage tower for storing the pulp after thermal dispersion treatment. By treating the white pulp residue recovered from the paper mill wastewater treatment plant, it can replace domestic waste white pulp, optimize the process flow, and reduce raw material costs.

Disclosed herein is a hygromorphic composite material comprising a moisture-active pollen paper substrate formed from a plurality of pollen microgel particles, and at least one moisture-inactive layer applied onto the top and / or bottom surface of the moisture-active pollen paper substrate with a pattern that causes the hygromorphic composite material to change its shape in a pre-determined manner due to a change in relative humidity of its ambient environment. Also disclosed herein is a method of forming the hygromorphic composite material.

The present application belongs to the technical field of paper yarn textile recycling, and provides a paper yarn fabric recycling method. The paper yarn fabric is mixed with water, a non-ionic surfactant is added, and the mixture is defibrated to obtain a defibration system; an oxidizing agent and a metal ion activator are sequentially added to the defibration system to perform an activation reaction, and a redispersed paper yarn fiber is obtained; the non-ionic surfactant is a PEG series or a Tween series; the oxidizing agent is a persulfate; and the metal ion activator includes oleic acid modified nano zero-valent iron and a divalent copper salt. The length of the redispersed paper yarn fiber obtained by the present application is between 1.5 and 2.1 mm, the length retention rate is between 63 and 88%, and the yield is between 80 and 98%.

The application discloses a kind of regenerated fly ash glass microsphere wear-resistant fiber composite waste paper pulp packaging paper and preparation method thereof, related to solid waste resource and papermaking technical field, by weight fraction, raw material includes air separation super first modified glass microsphere wear-resistant fiber 12-28 portion, recycled old paper shell paper pulp 72-88 portion, environmental protection composite additive 0.5-3 portion;By fly ash microsphere air separation purification, surface modification, with recycled waste paper pulp compound refiner, low-temperature is formed by being copied, and high-performance packaging reel paper is prepared.The application realizes the double efficient recycling of fly ash industrial solid waste and waste paper shell, improves the wear resistance and compression resistance of packaging paper, reduces resource consumption and carbon emission, has low production cost, adapts to existing papermaking production line, has high industrialization value, effectively promotes ecological environmental protection low carbon and circular economy development, solves the technical problems of poor performance of traditional recycled paper packaging paper, insufficient solid waste utilization and low environmental protection benefit.

This invention applies to the field of waste recycling or utilization. This invention discloses a process for banknote recycling. The banknote production process generates solid waste, such as paper scraps due to quality issues and printing defects, resulting in a large amount of waste that must be properly managed. Against this backdrop, to address the aforementioned problems, this invention provides a recycling process based on existing banknote components. In this way, the recycling of debris generated during banknote manufacturing reflects the importance of a circular economy and the responsible use of resources in the printing industry.

A method of making paper and paperboard products, including absorbent structures, is disclosed. The method includes mixing ultra-high molecular weight ("UHMW") glyoxalated polyvinylamide ("GPVM") adducts and high molecular weight ("HMW") anionic polyacrylamide ("APAM") with the furnish during slock preparation of a wet laid papermaking process. High wet strength paper and paperboard products are also disclosed.

This utility model relates to a processing system for short fiber to medium fiber system. The raw materials are fed into a pulp pretreatment device via a chain conveyor for crushing and deslagging, then sent to a primary grading screen for screening. The screened short fiber pulp is sent to a short fiber low-consistency deslagging device for deslagging, while other pulps are sent to a secondary grading screen. After deslagging by the short fiber low-consistency deslagging device, the short fiber pulp is concentrated by a short fiber multi-disc thickener, and then sent to a short fiber storage tower. The short fiber pulp in the storage tower is sent to a medium fiber low-consistency deslagging device for deslagging, and then undergoes thermal dispersion treatment. This effectively removes adhesives and small white pulp clumps from the short fiber pulp, improving the impurity removal rate and reducing the impact on paper quality.

The utility model provides a high quality paper pulp purification and energy -conserving carton forming device based on biological enzyme pretreatment belongs to paper pulp forming technical field. Including forming device body, still include: purification subassembly, purification subassembly is located one side of forming device body, and purification subassembly includes the slurry water tank of setting in one side of forming device body, is provided with outer filter bowl in the inside of slurry water tank, is provided with inner filter bowl in the inside of outer filter bowl, and the side of inner filter bowl is connected with feed inlet; Transmission assembly, transmission assembly is located the top of purification subassembly and is used for stirring the paper pulp in the inside of slurry water tank, through setting purification subassembly, the cooperation of outer filter bowl and inner filter bowl, the impurity of residual in paper pulp is filtered, prevents the impurity and enters the slurry pool of forming device, solved the problem that the enzyme preparation carrier or the incomplete reaction flocculate of possible existence in the enzyme treatment process in paper pulp, avoided the defect of carton surface forming, is favorable for the promotion paper box forming quality.

The present invention relates to a process for obtaining cellulose pulp from textiles, to the cellulose pulp obtained by the disclosed process, and to the further processing and use thereof.