3105 results about "Paperboard" patented technology

The invention discloses a double-PHA barrier system for a paper-based container and a paperboard as well as a preparation method and application of the double-PHA barrier system, and belongs to the technical field of paper-based material surface engineering and green packaging. The system sequentially comprises a paper base material, a water-based PHA dispersion hole sealing layer and a PHA extrusion compact layer from inside to outside. According to the invention, the micron-sized PHA dispersoid without cell debris is utilized, so that an efficient hole sealing effect which is difficult to achieve by a high coating amount in a traditional process can be achieved by only needing an extremely low coating amount, and the pinhole defect of an extrusion layer is eliminated from the source. And in cooperation with the modified PHA extrusion layer with the specific crystallinity, the problem of micro-cracking of a single coating during edge rolling forming is cooperatively solved. According to the system, excellent barrier performance is achieved through a thinner bio-based structure, and meanwhile the system has a wide heat sealing window and excellent repulp recycling performance. Compared with the prior art, on the premise that high performance is guaranteed, the consumption amount of packaging materials and the environmental burden are remarkably reduced.

The invention relates to the technical field of distributed control, in particular to an automatic control system and process for a corrugated carton production process, and the system comprises a body paper state online monitoring module which is used for collecting body paper humidity, preheating temperature and paperboard tension values in real time at a preheater node, combining the values into a multi-dimensional input data stream, establishing an initial working condition state vector, and outputting the initial working condition state vector; and calculating a deviation value between each parameter in the initial working condition state vector and a standard set value, and generating an upstream disturbance feature set. According to the method, the predicted value is compared with the control threshold value, the adjustment amount of the steam pressure or the production line speed of a plurality of downstream hot plate areas can be calculated, a distributed and feed-forward compensation instruction is generated, and the closed loop from source disturbance monitoring to future state multi-dimensional prediction to downstream multi-point cooperative compensation is more accurate. The suppression of production disturbance is realized, the control precision and response speed of quality fluctuation are improved, and the rejection rate caused by quality problems is reduced.

The invention discloses corrugated paper conveying equipment based on visual screening. The corrugated paper conveying equipment comprises an equipment frame, and a lifting seat is arranged at one end of the equipment frame in a lifting mode; the first conveyor is arranged in the equipment frame, one end of the first conveyor is rotationally installed in the lifting base, and the other end of the first conveyor is arranged at the end of the equipment frame in a lifting mode; a plurality of industrial cameras are arranged on the top of the first conveyor, unqualified products are found in time, when it is detected that a paperboard has defects and dimensional deviation, a material taking suction cup downwards adsorbs the paperboard and then rapidly lifts the paperboard upwards, the whole screening action is rapid and timely, and the unqualified products are effectively prevented from being mixed into qualified products; after the material taking suction cup lifts the materials, the second conveyor moves to the position below the material taking suction cup to receive and take the materials, the cleaning brush cleans the material taking suction cup during resetting, dust, chippings and other loose sundries can be effectively removed, and the adsorption effect and the service life of the vacuum suction cup are guaranteed.

The invention belongs to the technical field of intelligent manufacturing, and particularly relates to a paperboard sorting and self-adaptive indentation intelligent control system based on machine vision, which comprises an indentation operation component, a sorting visual identification component, a finished product transportation line and a defective product transportation line, and further comprises a self-adaptive indentation control system, an integrated thin film pressure sensor is mounted in the indentation cutter in the indentation machine; an image acquisition and processing unit, a time-illumination association unit, an adaptive shooting adjustment unit, an optimal frame selection strategy unit, a motion control and cooperation unit, a regular verification unit and a pressure adjustment unit are arranged in the adaptive indentation control system. Visual inspection is introduced, reflection interference can be eliminated, the problem of false detection caused by reflection of the film-coated paperboard in traditional single-light-source shooting is solved, the image recognition capacity is excellent, the screening efficiency is high, technological parameter backtracking and optimization are supported, and the yield only has small deviation due to seasonal fluctuation.

The present invention relates to compositions and methods for forming substantially bio-based barrier coatings suitable for application on paper and paperboard substrates, as well as paper and paperboard substrates to which one or more such substantially bio-based barrier coatings are applied. The bio-based barrier coatings of the present invention comprise a bio-wax emulsion comprising one or more bio-waxes, such as castor oil wax, formed by hydrogenation of a bio-based oil, such as castor oil. The barrier coating composition is formed by dispersing a bio-wax emulsion into a polyhydroxyalkanoate (PHA) dispersion and can be applied as a coating at ambient temperature, for example, to paper or paperboard, such as paper or paperboard consisting of regenerated fibers, using conventional industrial processes.

The invention discloses a visual alignment method and device for printing draft intelligent deflection and spraying vehicle cooperative control, and belongs to the technical field of machine visual localization, and the method specifically comprises the steps: firstly, arranging a calibration target in an ink-jet printing area, employing an image collection device to collect an image, and calculating a rigid transformation matrix of a visual coordinate system and a printer spraying vehicle coordinate system; establishing high-precision coordinate mapping; the control terminal reads the reference position and attitude information of the original draft in the spraying vehicle coordinate system from the production management system; the method comprises the following steps: after primary inkjet of a paperboard, shooting the whole paperboard by an image acquisition device, and extracting actual contour features and coordinates of a draft through image processing; the coordinates are mapped to a spraying vehicle coordinate system through a transformation matrix, and a rotation deviation angle and a translation deviation vector are calculated; analyzing to obtain angle and translation compensation values, packaging the angle and translation compensation values into a control instruction, and sending the control instruction to ink-jet printing control software through a real-time bus; finally, software drives a servo executing mechanism, the position and the posture of the spraying vehicle are adjusted according to a new target, and accurate alignment with the paperboard is achieved.

The present invention relates to a composition comprising an aqueous dispersion of biodegradable polymer particles, a method of preparing the composition, and a method of preparing a coated substrate comprising the composition. The composition is useful as a coating applied to a substrate, particularly a paper substrate. The coated paper is useful as a single layered barrier coated paper or paperboard.

The invention discloses a thickness laser measuring device for corrugated paper packaging box production and a method thereof, and relates to the technical field of laser thickness measuring devices. The concave-convex part of the corrugated board can be extruded through rolling of an air bag of the measurement pretreatment mechanism, flattening is achieved, meanwhile, high-speed airflow generated by an air cylinder purges paper scraps on the surface through air inlet and outlet holes, suction force generated when a piston is reset subsequently can suck the residual paper scraps into a detachable dust collection cylinder, the paper scraps are prevented from blocking a laser light path, and measurement errors are reduced from the source; secondly, in the laser thickness measuring mechanism, a first laser thickness measuring assembly and a second laser thickness measuring assembly move in opposite directions and are matched with the movement of the paperboard along with the conveying belt, measuring point positions in a larger range on the surface of the paperboard can be covered, the contingency of single-point measurement is avoided, a touch switch of a laser thickness gauge can be triggered and starts to work only after the preprocessing mechanism completes the purging action, and the accuracy of measurement is improved. The problem that paper scraps raised during purging interfere with a light path is thoroughly avoided, and the data validity is further guaranteed.

The present invention relates to a composition comprising an aqueous dispersion of biodegradable polymer particles, a method of preparing the composition, and a method of preparing a coated substrate comprising the composition. The composition is useful as a coating applied to a substrate, particularly a paper substrate. The coated paper is useful as a single layered barrier coated paper or paperboard.

The invention relates to the technical field of logistics information management, and particularly discloses a corrugated board logistics information tracking method and system based on RFID, logistics state data of corrugated boards are obtained through RFID and preprocessed, a knowledge graph including entities such as corrugated cartons, storage nodes and transportation tools and association relationships is constructed, the nodes are converted into low-dimensional vectors, and the low-dimensional vectors are stored in a database; key factors and causal effect values which cause anomalies in entity association are mined by utilizing a causal forest algorithm, an abnormal propagation path is reasoned through a graph neural network, a root cause report is generated, targeted decisions such as sorting adjustment, equipment maintenance and path re-planning are generated accordingly, and a graph and a model are updated in real time to adapt to dynamic changes. According to the method, multi-dimensional data, entity relation modeling, causal effect analysis, propagation path reasoning and dynamic optimization design are integrated, the problems of unclear explanation of abnormal root causes and lack of pertinence in decision making in traditional corrugated board logistics tracking are effectively solved, and the accuracy of logistics information tracking and decision making effectiveness are improved.

The invention provides a coating device for paper cup production, and belongs to the technical field of paper cup processing, the coating device comprises a transmission frame and a spraying frame, a paperboard is arranged above the transmission frame, the transmission frame is connected with a lifting assembly, the transmission frame is connected with a collecting box, the coating device further comprises a trowelling assembly, the trowelling assembly is connected with a hot-air blower, and the hot-air blower is connected with the spraying frame. The trowelling assembly is used for uniformly scraping a coating on the surface of the paperboard; the device has the beneficial effects that through the lifting assembly and a V-shaped scraper of the trowelling assembly, it can be guaranteed that the thickness of a coating is uniform, redundant paint can be guided to a collecting box and can be recycled after being treated, and the production cost is reduced; meanwhile, the air heater synchronously blows out hot air after the coating is scraped, rapid curing of the coating is promoted, the product quality is improved, the air heater can switch airflow paths to automatically clean the scraping plate, residual coating is stripped through high-speed airflow, it is avoided that subsequent use is affected by drying and caking, the manual cleaning cost is saved, and the long-term scraping precision is guaranteed.

The invention belongs to the technical field of corrugated paperboards, and is characterized in that wood fibers and modified bamboo fibers prepared by reaction of allyl bamboo fibers, 1, 4-butanediol di (mercaptoacetate) and magnolol are pulped, a biodegradable water-resistant auxiliary agent is added for hydrophobic modification, papermaking and shaping are carried out to prepare water-resistant base paper, and the water-resistant base paper is prepared by the following steps: pulping the modified bamboo fibers and the biodegradable water-resistant auxiliary agent. And finally, preparing a surface paper layer, a corrugated medium paper layer and an inner paper layer from the water-resistant raw paper, and bonding and pressing to obtain the corrugated board. Magnolol groups grafted on the surfaces of the modified bamboo fibers can improve the water absorption performance of the fibers, and the hydrophobicity of the corrugated board is improved through the synergistic effect of the magnolol groups and the biodegradable water-resistant auxiliaries; the surface of the biodegradable water-resistant auxiliary agent is embedded with a carboxylated nano-cellulose structure, so that the biodegradable water-resistant auxiliary agent has deformation resistance; the epoxidized soybean oil is used as a core part and has excellent hydrophobicity; through combination of a polyphenol structure of tannic acid and hydrogen bonds of water-resistant base paper fibers, the mechanical properties of the corrugated board are improved, and the corrugated board has excellent biodegradability, hydrophobicity and mechanical strength.

The invention relates to a flash evaporation material with high transparent strength and a preparation method thereof, the flash evaporation material comprises the following raw materials: polyethylene with high transparent strength of 0.2-3 kN / m; the high-permeability strength is equal to the moisture permeability index * the longitudinal tensile strength; the test standard of the tensile strength is a constant-speed tensile method for testing the tensile strength of paper and paperboards according to GBT 12914-2018; the test standard of the moisture permeability index is GB / T 11048-2018 determination of thermal resistance and moisture resistance (evaporation hot plate method) under the physiological comfort steady state condition of the textile. The flash evaporation material disclosed by the invention has relatively good high-transmittance strength.

The invention relates to the technical field of corrugated board production, in particular to a corrugated board finished product multi-specification automatic sorting and intelligent scheduling method which comprises the following steps: acquiring an original paperboard image on a corrugated board production line, extracting characteristic specification parameters of paperboards according to the original paperboard image, and generating a paperboard attribute data set; the method comprises the following steps: acquiring spare capacity data and downstream process demand information of each outlet of a sorting line, and calculating a sorting target position priority weight according to the spare capacity data and the downstream process demand information; through multi-link collaborative optimization, the problems existing in the prior art are solved in a targeted manner, resource idling and emergency order delay are effectively avoided, the problem that transportation delay and equipment performance are not matched due to a static path is solved, the continuity of cache region circulation and preferential execution of emergency transfer tasks are ensured, and the service life of the cache region is prolonged. Finally, high efficiency, accuracy and stability of the whole process of sorting and dispatching the finished corrugated boards are achieved.

The utility model discloses a paperboard crease processing device which comprises a working table, a crease mechanism arranged on the working table and a receiving mechanism arranged on one side of the crease mechanism, the crease mechanism comprises a bearing frame, a conveying roller and a rotating drum, the conveying roller and the rotating drum are arranged below the bearing frame, and a first motor used for driving the conveying roller and the rotating drum is fixed on the bearing frame. The receiving mechanism comprises two vertical supporting piles and a receiving table arranged between the two vertical supporting piles, a second motor is fixed to one of the vertical supporting piles, side grooves are formed in the opposite sides of the two vertical supporting piles, a screw rod and a guide rod are arranged in the two side grooves correspondingly, and the screw rod and the guide rod are arranged in the receiving table. The screw rod is fixedly connected with the output end of the second motor, and the two ends of the guide rod are fixedly connected with the vertical supporting piles. According to the paperboard crease processing device, automatic stacking of paperboards can be completed, it can be guaranteed that the stacked paperboards are kept in a tidy state, and meanwhile the trouble of manual paperboard arrangement and carrying is avoided.

The invention relates to the technical field of corrugated board detection, in particular to a corrugated board warping detection method and system based on multi-modal data fusion. The method comprises the following steps: acquiring three-dimensional point cloud data of a corrugated board; a paperboard contour main body point set is obtained through a preset spatial clustering algorithm; performing point cloud feature extraction to obtain a point cloud global feature vector; performing cubic polynomial fitting on the paperboard contour main body point set to obtain a standard image; performing image feature extraction on the standard image to obtain an image global feature vector; performing fusion processing on the point cloud global feature vector and the image global feature vector to obtain a multi-modal fusion feature vector; and inputting the multi-modal fusion feature vector into a pre-trained classifier, and outputting the warping category of the corrugated board. The obtained multi-modal fusion feature vector gives full play to the geometric accuracy of the three-dimensional point cloud data and the semantic richness advantage of the standard image, and the detection accuracy of the corrugated board warping is improved.

The invention relates to the technical field of data analysis, and discloses a corrugated board quality control method and system based on data analysis and a medium. The method comprises the following steps: acquiring body paper performance parameters and environment and process parameters through a sensor, and performing data processing and verification to obtain an original data set; the data are grouped through standardization processing and a clustering algorithm, and factor groups related to the strength, the thickness deviation and the pressure resistance of the paperboard are determined; predicting the factor group by adopting a neural network prediction model to obtain a prediction score, comparing the prediction score with a target standard value, and calculating a deviation factor; fusing the deviation factor and the process parameter range through a weighted summation method to obtain a preliminary quality control index set; performing weight adjustment on the index set according to the paperboard category and the production batch to obtain an optimized quality control index; and a change trend is extracted from the optimization indexes, and a real-time quality early warning signal is generated by adopting threshold comparison. The quality control and real-time early warning capability in the corrugated board production process is improved.

The invention relates to the technical field of moisture content measurement, and discloses a corrugated board moisture content measurement method and system, and the method comprises near infrared spectrum data, microwave transmission data and acoustic vibration data; calculating a spectral feature vector; constructing a microwave response matrix; determining an acoustic damping coefficient; calculating stability indexes of the spectral feature vector, the microwave response matrix and the acoustic damping coefficient in a preset time window, and calculating a consistency index and a confidence coefficient weight; fusing the spectral feature vector, the microwave response matrix and the water content corresponding to the acoustic damping coefficient through a Kalman filtering algorithm, and outputting initial water content; dynamically adjusting a process noise covariance matrix of Kalman filtering, and when the residual error of any data source exceeds a preset statistical threshold value, resetting the confidence coefficient weight corresponding to the data source to zero; and repeatedly executing fusion, and outputting the water content. According to the method, three measurement means of near infrared, microwave and acoustics are adopted, the water content state of the corrugated board can be represented more comprehensively, and the water content measurement precision is improved.

The utility model discloses a reinforced cardboard packaging box, which belongs to the field of packaging boxes and comprises a box body, a top cover is arranged at the top of the box body, a bottom plate is arranged at the bottom end of the box body, an insertion component is arranged between the bottom plate and the bottom of the box body, a first reinforcing component is arranged on the outer side of the box body, and a protective layer is arranged in the box body. A second reinforcing assembly is arranged between the protective layer and the inner wall of the box body, first handles are arranged on the two sides of the box body, and a second handle is arranged at the top end of the top cover. Through the cooperation of the first reinforcing assembly and the second reinforcing assembly, the effect of reinforcing the outer corners and the inner corners of the box body is achieved, the deformation degree of the box body caused by collision is reduced, the effect of reinforcing the box body is achieved, and the use effect of the box body is kept.

The invention discloses an acid-neutral nano PHA paperboard reinforcing agent as well as preparation and application thereof, and belongs to the technical field of papermaking chemicals. The reinforcing agent is a bio-based nano water-based emulsion, and the core of the reinforcing agent is that a stable high-positive-charge nanoparticle interface is constructed under an acid-neutral window through the synergistic effect of polyphenol and an amine polymer. The environment-friendly wet strength agent solves the potential safety hazard of the traditional wet strength agent, and does not contain free formaldehyde and epichlorohydrin. The method has the outstanding advantages that the method is completely compatible with a modern papermaking acid-neutral process, and the defect that the similar bio-based technology needs to react under alkalinity is overcome; the adhesive is flexible to apply, can be efficiently used for wet end addition, or can be stably compounded with oxidized starch for surface sizing; the preparation method is simple, efficient and energy-saving, can realize excellent wet strength retention rate and dry strength improvement under the conditions of low addition amount and conventional industrial drying at 105 DEG C, and does not need extra high-temperature curing.

The application discloses a high-performance corrugated carton with waterproof and antibacterial functions and a preparation process thereof, and the process comprises the following steps: S1, providing a corrugated paperboard substrate; S2, coating a barrier-enhanced coating liquid on the inner and outer surfaces of the corrugated paperboard substrate respectively, and forming a barrier-enhanced coating layer after solidification; S3, coating a composite antibacterial coating liquid, and forming a composite antibacterial coating layer after solidification to obtain a composite corrugated paperboard; and S4, using the composite corrugated paperboard to make a corrugated carton. The composite antibacterial coating layer can improve the waterproof performance of the composite corrugated paperboard and endow the composite corrugated paperboard with excellent antibacterial performance. Through cooperation of the barrier-enhanced coating layer and the composite antibacterial coating layer and with the excellent barrier effect of the barrier-enhanced coating layer, the waterproof performance of the composite corrugated paperboard can be further improved while avoiding the risk that active oxygen brought by the composite antibacterial coating layer may damage the performance of the corrugated paperboard substrate, and the mechanical strength of the composite corrugated paperboard can be improved, so that the service life of the composite corrugated paperboard can be ensured.

The present disclosure provides a coated paperboard comprising a paperboard substrate and a coating layer wherein: the coating layer comprises a pigment mixture and a binder in a dry weight ratio within the range of from 100:14 to 100:25; the pigment mixture comprises a calcium carbonate pigment and a clay pigment in a dry weight ratio within the range of from 98:2 to 92:8; and the calcium carbonate pigment has a particle size distribution (wt. %<2 μm) within the range of from 75 to 95.

The present invention concerns a paper-based barrier multilayer packaging material structure (1) being formed as a unitary sheet and comprising from its outer surface to its inner surface, the following layers: —a polymer dispersion coating (9) having a thickness of 1 to 10 μm, —a paperboard (8) having a grammage of between 120 g / m2 and 500 g / m2, —a water-based or solvent-less adhesive (7) having a thickness of 1 to 10 μm, —a barrier metallized paper layer (MBPL) having substance weight between 30-120 g / m2, preferably 45 to 90 g / m2 and a Water Vapour Transmission Rate (WVTR) of 10 to 0.1 g / m2 / d, preferably a WVTR of 1.0 to 0.1 g / m2 / d measured at 38° C. and 90% RH, and an Oxygen Transmission Rate (OTR) comprised between 100 and 0.1 cc / m2 / d, measured at 23° C. and 50% RH, preferably an OTR comprised between 1.0 and 0.1 cc / m2 / d. —at least one layer of a polymer dispersion coating (2) having a thickness of 1 to 25 μm, preferably of 5 to 15 μm.

The invention discloses a grooving positioning system based on a paperboard digital intelligent grooving machine, relates to the technical field of grooving machine positioning adjustment, and solves the technical problems of insufficient transverse deviation adjustment precision and incomplete longitudinal deviation compensation. Proportional, integral and differential parameters of the incremental PID are dynamically adapted according to the deviation, compared with a fixed parameter PID, the adjustment response time is shortened, the overshoot is controlled within + / -0.01 mm, the transverse positioning precision is improved, and the high-precision grooving requirement is met. A total error model of a linear error and a periodic error is established through a laser interferometer for encoder error calibration. And in combination with a PLC position-compensation amount comparison table, encoder positioning errors are reduced, dynamic environment compensation fits a paperboard stretching model through a humidity sensor, an equipment thermal deformation model is established through a temperature sensor, temperature and humidity influences are comprehensively compensated, and the longitudinal positioning precision fluctuation range is narrowed.

The utility model provides a packaging carton edge folding device, and relates to the technical field of packaging equipment. Comprising a supporting frame, a moving part arranged at the top end of the supporting frame, a pressure part erected on the moving part, an edge folding part arranged on the supporting frame and corresponding to the pressure part, and a feeding part arranged on the working face on one side of the supporting frame. The supporting frame has preset bearing capacity and is of a frame type structure. Shielding parts are symmetrically arranged on the edge folding part, and the shielding parts are located on one side of the edge folding part; the moving part is movably connected with a negative pressure part used for conveying paperboards. The packaging carton edge folding device can meet the edge folding requirements of packaging cartons with different shapes and sizes, can achieve diversified edge folding effects, meets different packaging requirements, and improves the universality and the edge folding efficiency. And secondly, the edge folding part and the shielding part do not need to be driven by additional power, energy consumption is reduced, and the equipment maintenance cost is reduced.

The utility model belongs to the technical field of reactors, and particularly relates to an extra-high voltage shunt reactor oil tank composite noise reduction structure which comprises a rubber plate fixedly installed in an oil tank wall, the outer side of the rubber plate is attached to the surface of the inner side wall of the oil tank wall, and a sound absorption hole-free paperboard is fixedly installed on the inner side of the rubber plate. A double-layer composite perforated plate sound absorption mechanism is fixedly installed on the inner side of the sound absorption hole-free paperboard, gaps are reserved among the rubber plate, the sound absorption hole-free paperboard and the double-layer composite perforated plate sound absorption mechanism, and a gap is reserved between two layers of perforated plates of the double-layer composite perforated plate sound absorption mechanism. The double-layer composite perforated plate sound absorption mechanism comprises a first perforated paperboard and a second perforated paperboard. The composite noise attenuation structure composed of the rubber plate and the multiple layers of insulating paper plates is arranged on the inner side wall of the oil tank, vibration waves transmitted from insulating oil are blocked and weakened through material combination of different media, vibration noise can be reduced, and the composite noise attenuation oil tank is an important measure for solving the problem of noise of an electric reactor.

The invention discloses a control optimization method based on a digital intelligent paperboard grooving machine, relates to the technical field of paperboard grooving, and solves the problems that the idle stroke distance of a cutter head is long and repeated motion is frequent due to the fact that a motion trail is not optimized in combination with the distribution condition of an actual grooving area. The invalid travel is reduced; and on the basis of a single-time or double-time confirmation process of the total number of grooving positions, path planning in each grooving area is further optimized, the finally formed optimal path remarkably shortens the movement distance of the grooving machine, the overall grooving speed is increased, the method is particularly suitable for a batch machining scene of multiple grooving areas, and the machining efficiency is improved. For the condition that irregular paperboards or multiple feature points exist, through a multi-round coincidence verification and path adjustment mechanism, the adaptability of equipment to complex processing scenes is enhanced, and the fault tolerance and stability of the system are improved.

The invention discloses a self-adaptive humidity adjusting carton printing device and a carton printing method thereof, belongs to the technical field of carton printing equipment and printing processes, and aims to solve the problems that the printing rejection rate is high, the labor cost is increased, and raw materials are wasted due to the fact that manual judgment and adjustment are needed, response lag exists, and the precision is low. According to the invention, full-breadth scanning is carried out through three or more groups of sensors, subarea compensation is triggered by + / -0.5% humidity difference, the problems of image-text set-off in a high-humidity area, ink layer falling off in a low-humidity area and paperboard embrittlement are avoided, and the full-breadth printing consistency deviation is less than or equal to 2%; and through a closed-loop correction mechanism, accurate landing of ink viscosity, roller pressure, drying temperature and paper feeding speed and the standard reaching rate of ink layer adhesive force are ensured, meanwhile, automatic elimination is conducted when the humidity is larger than 14% or smaller than 6%, production is recovered after reinspection is qualified, the situation that the paperboard exceeding the standard flows into the printing link is avoided, the printing quality is remarkably improved, and the defect rate is greatly reduced.

A method of making paper and paperboard products, including absorbent structures, where 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 stock preparation of a wet laid papermaking process.

The utility model relates to the technical field of automatic folding mechanisms of packaging boxes, in particular to a paperboard folding mechanism for a data line. Comprising a four-station index plate, a pre-folding mechanism, a first edge folding mechanism and a second edge folding mechanism, and the four-station index plate comprises a feeding station, a first edge folding station, a second edge folding station and a discharging station which are sequentially arranged in the rotating direction of the four-station index plate; the feeding station receives card paper transferred from the pre-folding mechanism, the first edge folding mechanism is located at the position of the first edge folding station, and the second edge folding mechanism is located at the position of the second edge folding station. Four positioning jigs of the same structure are evenly arranged on the four-station index plate in a surrounding mode so as to correspond to the feeding station, the first edge folding station, the second edge folding station and the discharging station respectively. The pre-folding mechanism comprises a positioning table and a pressing plate assembly arranged over the positioning table. The full-automatic paperboard folding machine can fully automatically fold the two end parts of the horizontal part of the paperboard in the length direction, and is high in automation degree and high in folding efficiency.