Novel Parameter Identification Method for Basis Weight Control Loop of Papermaking Process

The basis weight control loop of the papermaking process is a non-linear system with time-delay and time-varying.It is impractical to identify a model that can restore the model of real papermaking process.Determining a more accurate identification model is very important for designing the controller of the control system and maintaining the stable operation of the papermaking process.In this study,a strange nonchaotic particle swarm optimization(SNPSO)algorithm is proposed to identify the models of real papermaking processes,and this identification ability is significantly enhanced compared with particle swarm optimization(PSO).First,random particles are initialized by strange nonchaotic sequences to obtain high-quality solutions.Furthermore,the weight of linear attenuation is replaced by strange nonchaotic sequence and the time-varying acceleration coefficients and a mutation rule with strange nonchaotic characteristics are utilized in SNPSO.The above strategies effectively improve the global and local search ability of particles and the ability to escape from local optimization.To illustrate the effectiveness of SNPSO,step response data are used to identify the models of real industrial processes.Compared with classical PSO,PSO with timevarying acceleration coefficients(PSO-TVAC)and modified particle swarm optimization(MPSO),the simulation results demonstrate that SNPSO has stronger identification ability,faster convergence speed,and better robustness.

Development and Evolution of Papermaking in Ancient China based on the Uses and Forms of Paper

In the past,scholars have divided the history of Chinese papermaking into different stages based on the development of ancient papermaking technology,emphasizing the development and progress of papermaking in different historical periods but paying less attention to the changes in the form of paper.Here,the stages are defined based on changes in use and function rather than technological developments.When this approach is combined with the history of printing,books,calligraphy,and painting,the history of Chinese papermaking can be divided into the writing paper,writing and printing paper,printing paper,and calligraphy and painting paper periods.Different periods of paper have significant differences in texture,form,and performance owing to their different applications.This significant difference provides a reference for the identification of ancient papers and reveals the internal connection between the history of printing,books,calligraphy,painting,and papermaking.

Application of Cellulose Nanofibril as a Wet-end Additive in Papermaking:A Brief Review

Recently,cellulose nanofibril(CNF)has emerged as a promising,sustainable reinforcement with outstanding potential in material science.Owing to the properties of CNF,it has been explored in food,cosmetic,and pharmaceutical applications,as well as in industrial applications such as paints,drill muds,packaging,and papermaking.The application of CNF in papermaking is expected to be implemented in the near future to broaden the commercial market of cellulose.Numerous studies and patents have reported on the manufacturing,properties,and applications of nanocellulose.This present paper focuses on the recent progresses in the application of CNF as a wet-end additive in papermaking.

Review of energy consumption research for papermaking industry based on life cycle analysis

Papermaking industry is a high-energy-consuming industry with long supply chain.The growth of paper product demand further intensifies the need of energy consumption.Energy saving through the full supply chain has become a focal point for long-term sustainable development of the papermaking industry.This paper reviews the advances in life cycle analysis for the papermaking industry in recent years.All the stages from the full supply chain are involved to give a panoramic overview of the papermaking industry.The object of this paper is to provide scientific basis to industry and decision-makers with profound understanding of the energy consumption and energy saving potential in a life cycle perspective.

Production of Bamboo Fiber Reinforced Fibrillated Poly(Lactic Acid)(PLA) Material Obtained by a Papermaking Process

A devised beating process was applied, which enabled the formation of slurry consisting of uniformly dispersed fibrillated polylactic acid（PLA） fibers with bamboo fiber, and the polymer material was obtained by a conventional papermaking process. Owing to the fast dewatering time, good repeatability and the facility to manufacture on a large scale, this process was used. It was revealed that the beaten PLA fiber was overall in machinery extrusion by the results of optical microscope and scanning electron microscope（SEM） observations. The improvement in the tensile index, burst index, tear index and other mechanical properties was considered as a key benefit as a result of adding bamboo fiber.

FUNCTIONS OF POLYAMINES IN ROSIN SIZING UNDER NEUTRAL PAPERMAKING CONDITIONS

Functions of the polyamines in neutral rosin sizing were investigated using X-ray photoelectron spectroscopy (XPS) and laser diffraction particle analysis. The polyamine with a higher charge density and a smaller unite size could retain more rosin and cover larger fiber surfaces. The XPS spectra demonstrated that polyallylamine (PAAm) and polyvinylamine (PVAm) could react with a rosin size to form a -OC-N-CO- structure, but polydimethylamino ethyl methacrylate (PDMAEMA) could not. The formation of this structure may be a key step for effective sizing.

Coaxing Polysaccharide Granules into Supramolecular Biocolloidal Additives for Papermaking

In light of developments in polysaccharide-based sustainable processes involving supramolecular interactions,we herein present our findings pertaining to coaxing polysaccharide granules into functional supramolecular biocolloids.Translucent biocolloidal dispersions containing various forms of starch are facilely designable,essentially built upon complexation between disassembled native cornstarch granules and amphiphilic ligands.Oily moieties of guest molecules are dynamically attractable into cavities of helical structures,with cationic groups pointing toward the bulk phase.This noncovalent attraction can generate core-shell biocolloidal particles.The significantly higher gelatinizability of freeze-dried biocolloids in contrast to native cornstarch granules is attributable to complex formation,and a homogenous dispersion is readily formable at room temperature.Our results also show biocolloids'ligand-related antibacterial activity.The use of biocolloids as wet-end additives for biofiber assemblies(cellulosic paper)can enhance mechanical strength,fines retention,and filler bondability.Supramolecular biocolloids with positively charged,translucent,easily gelatinizable,antibacterial,and polysaccharide-bondable functionalities would find tailorable use in the paper industry.

Wet Pressing Models to Reduce Energy Consumption in Papermaking

Improved wet pressing reduces the need for drying and consequently energy needed in papermaking. Accordingly, it is desirable to optimize wet pressing, but the process is very complex with many interacting variables. It is therefore desirable to employ a mathematical model that accounts for the major variables to estimate the effects of changes in equipment and operating variables. This paper descibes such a model called the Decreasing Permeability Model (DPM). Mill and pilot plant applications over a wide range of basis weights for paper and paper board are described.

Preparation of adhesive for bamboo plywood using concentrated papermaking black liquor directly

Adhesive for bamboo plywood prepared directly using lignin existing in the black liquor as a kind of material replacing phenol was proposed on the basis of the same structural properties of lignin and phenol. The results indicate that the reaction time of black liquor methylating is 30min, when the ratio of alkali to formaldehyde is controlled at approximately 0.20, decomposition rate of formaldehyde is the lowest and the effect of black liquor methylating is the best, the optimal molar ratio of phenol: formaldehyde to NaOH to H2O of preparing phenolic resin is 1.00∶1.50∶0.50∶9.00, and the suitable viscosity is 2730Pa·s. At different mass ratios of methylated black liquor to phenolic resin, all terms of performance of black liquor phenolic resin are excellent and satisfy the requirement. All terms of performance of bamboo plywood prepared using this technique are better than that of excellent bamboo plywood of national criteria. Using this technique, the cost is depressed by 28.69% without altering the traditional adhesive producing technique flow, and without using additional equipment.

THE PULPING AND PAPERMAKING CHARACTERISTICS OF YOUNG L.GMELINI AND B.PLATYPHYLLA

5, 10, 15, and 20 year old Larix gmelini and Betula platyphylla were used as pulping raw material in the research. The examination of young L. gmelini and B. Platyphyllafibrous structures showed that the fiber length and ratio of length to width of 5 years old L. gmelini noticeably differed from that of mature L. gmelini. but that of 5 year old B. platyphyllawere nearby equal to that of mature B. platyphylla. The research results indicated that 15 years old B. platyphylla and 20 year old L. gmelini were best suited to pulping among the eight experimental raw materials; 10 years old B. platyphylla and 15 year old L. gmelini were optimal to the ratio of beating degree increment and corresponding beating time. The pulp characteristics of 15 year old B. platyphylla and 20 year old L. gmelini were similar to those of mature wood, and it was feasible to consider 15 years to B. platyphylla and 20 years to L. gmelini as their rotation period; 10 years and 15 years as their thinning cycles for the papermaking forest base.

A Neural Network Controller for Basis－weight Control of Papermaking Processes

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The Protection and Inheritance of the Traditional Papermaking Process: A Case Study of the Zhang Paper Workshop

The Zhang Paper Workshop preserving the complete traditional papermaking process has been praised by experts as “the living fossil of Chinese papermaking”. Due to the impact of industrial papermaking, however, the traditional papermaking has gradually lost its market advantage, and the Zhang Paper Workshop prevailing for a time is already on the decline. In order to retain this precious cultural heritage, for more than 10 years, the Gleaners has spared no effort to provide various efforts to papermakers and has found a way out for the manual papermaking, and results have been achieved. How to protect and inherit the traditional papermaking process under the premise of conserving the ecological environment and maintaining the integrity of the papermaking process, and establish the Zhang Paper Workshop as a place for spreading the concept of nature conservation and cultural heritage protection is an urgent problem to be solved. This requires the support of policies, the investment of funds and the upgrading of technology, as well as the promotion of understanding and the cultivation of feelings.

COLLAGEN PROTEIN AND ITS APPLICATION IN PAPERMAKING

The structure and characters of collagen were introduced in detail in this paper. The application and the research progress of collagen in papermaking were also briefly described.

Indoor Particle Contamination in Airlaid Papermaking Workshop

一现场基于八地点的空气采样测试在天津在 anairlaid papermak-ing 专题讨论会被执行，中国。由理论计算，在室内的静态的气流的超级吸收剂聚合物(树液) 尺寸和它的存在国家被获得。在取样的空中的树液内容通过化学分析方法被测试并且发现了是人，健康在生产区域限制的 3.0-7.2 时间。推迟粒子(TSP ) 和能呼吸的粒子的总数的集中被称完成。大多数担心的粒子为改变的功能区域不同。比 10 亩 m 小的粒子主要在主要生产过程，和在包装区域产生的 73%-90 百分比粒子被生产比 10 亩大 m。树液原料粒子罐头容易改变了到由不可避免的挤出和摩擦推迟形式。在能呼吸的粒子和 TSP 之间的关联在大气的环境与那同意很好。

Ministry of Water Resources and Ministry of Industry and Information Technology Issued Seven Industrial Water Quotas Including Papermaking

On December 30^(th), 2020, in order to further promote water conservation, Ministry of Water Resources and Ministry of Industry and Information Technology issued a notice on seven industrial water quotas including papermaking, and the quota standard was came into effect on March 1^(st), 2021.

基于造纸污泥的活性炭对恩诺沙星的吸附研究

本研究首先从造纸污泥制备炭化物(CCP),再利用磷酸/硝酸混合液活化CCP,制备造纸污泥基活性炭(ACPMS)。将ACPMS用于抗生素恩诺沙星(ENF)的吸附去除。结果表明,ENF在ACPMS上的吸附过程符合朗格缪尔等温线模型和准二阶动力学模型,最大吸附能力为46.8 mg/g,表明ACPMS可以高效吸附ENF,是一种从环境基质中去除抗生素的有效工具。

造纸高浓度磨浆机浓度控制系统设计

造纸工业中的高浓度磨浆机是一个关键的工艺设备,其性能和控制直接影响到纸张的最终质量和生产效率。基于此,从高浓度磨浆机的结构和工作原理入手分析,关注浓度控制系统的设计和关键组成部分,研究数据采集、处理和分析的方法,此外探讨多目标优化控制模型以及力学能耗模型,以确保磨浆机在不同工况下能够实现最佳性能,进而实现可持续和高效的造纸生产过程。

制浆造纸废水深度处理方法研究

制浆造纸废水深度处理是实现对废水的降解和净化的重要环节。采用深度处理技术,不仅可以使得制浆造纸废水达到国家标准排放要求,还可以最大化地利用并回收水资源,降低环境污染和资源浪费的情况。在分析制浆造纸废水来源以及处理难点的基础上,介绍了几种制浆造纸废水的深度处理方法,旨在发挥深度处理的技术优势和效益,提升制浆造纸企业废水处理的可持续发展能力。

“三位一实”模式下制浆造纸专业学生英语水平的提升与实践

制浆造纸产业作为传统制造业在新时代继续快速转型,英语作为国际通用语言对于制浆造纸专业学生学习国外先进生产与管理技术十分重要。在“三位一实”的模式下,探索制浆造纸专业学生英语学习策略的新方式,对教学中存在的漏洞进行精准解决,不断对教学形式、教学场景、教学内容进行创新。从宏观角度说明了“三位一实”的实用型英语教学方式重要性,并提出了创新性的改革策略,包括强化词汇、多语言学习、完整性课程安排、场景式教学等,学生能够在接近真实的工作环境中练习英语,巩固专业词汇、提升表达能力。“三位一实”模式的发展为制浆造纸专业学生的专业性英语水平的提升提供了有效参考。

离子交换树脂在造纸废水脱盐中的应用研究

本研究采用732氢型阳离子交换树脂(以下简称阳离子树脂)、201×7氢氧型阴离子交换树脂(以下简称阴离子树脂)对造纸废水进行脱盐处理,研究了树脂在静态吸附和动态吸附过程中对造纸废水中离子的吸附性能。结果表明,阳离子树脂对造纸废水中Na^(+)、Ca2^(+)、Mg2^(+)和Fe3^(+)均有明显的去除效果,阴离子树脂对Cl^(-)和SO_(4)^(2-)有明显的去除效果。吸附时间为15 min、阳离子树脂∶阴离子树脂=1.2∶1.4(质量比),阳、阴离子树脂联用脱盐效果最佳。动态吸附过程中,随着流速增大,阳、阴离子树脂对离子的去除效果逐渐减弱,阳离子树脂适宜动态吸附流速为4~12 BV/h,阴离子树脂适宜动态吸附流速为4~10 BV/h。阳离子树脂的最佳再生条件为动态吸附流速4 BV/h、质量分数4%、体积3 BV,阳离子树脂再生率为94%;阴离子树脂的最佳再生条件为动态吸附流速4 BV/h、质量分数5%、体积3 BV、阴离子树脂再生率为84%。饱和吸附后树脂多次充分再生情况下,阳离子树脂再生率保持在90%以上,阴离子树脂再生率保持在80%以上。