It is important for you to sort your household trash and make sure all paper goes in the. This starts with the repulping process, where the paper is defibered and ink is removed from the fiber surface. Mech 450 pulping and papermaking topic 3b refiner mechanical pulping james a. The kraft process entails treatment of wood chips with a hot mixture of water, sodium hydroxide naoh, and sodium sulfide na 2 s, known as white. The paper mill boilers 2 produce steam for turbines 3 that make electricity for motors and pumps. Olson pulp and paper centre, department of mechanical engineering, university of british columbia refiner mechanical pulp rmp wood chips are comminuted into fibres by bars on rotating and stationary discs. Zicheng chen, a,b huiwen zhang, a zhibin he, b lanhe zhang a and xiaopeng yue b,c, as a widely distributed and fast growing graminaceous plant, bamboo has emerged as an important raw material for pulping and papermaking to mitigate the shortage of wood resources, at least in the east asia region. The paper machine then converts the pulp into a thin base paper, which, at the end of the production process, is coated to give it a superb flat surface and bright shade. Generally speaking, there are 3 kinds of paper pulp. Then, it discusses the various mechanical, chemical, and semichemical pulping processes used to separate the fibers in wood. Commercial processes are generally classified as mechanical, chemical, or semi. Sulfite wood pulp the pulp fiber is long and soft, has the properties of good toughness, high strength, easy bleaching and excellent felt ability.
The choice of pulping process is determined by the desired product, by the wood species available, and by economic considerations. Pulping and papermaking an overview sciencedirect topics. So we share our knowledge with customers, providing them with samples, specifications, ideas, technical information and a complete range of brochures. Many mills either process laminated waste paper into pellets for boiler fuel or pay to have the wastes land filled. The use of wood to make pulp for paper began with the development of mechanical pulping in germany by f. Figure 7 an illustration of an integrated chemical pulp mill and paper machine. Pulp mills can vary considerably, however the papermaking process is relatively. However, the strength and quality of fiber, and other factors complicate the pulping process. For every ton of pulp produced, the kraft pulping process produces about 10 tons of weak black liquor or about 1. Chemical recovery is the process in which the inorganic chemicals used in pulping are recovered and regenerated for reuse. Our customers repeatably report improved results in performance, efficiency, quality, cost savings, and enhanced sustainability just to mention a few. Pulping system is the first stage of paper making process, this system contain pulping, cleaning, screening and refiner, generally our paper pulp machine can. The pulping process converts this wood into the most appropriate type of pulp. Jul 26, 2017 this video introduces the complete stock preparation process of carton board paper, fluting paper and t paper, you can know better about paper making process through this.
Brief description of the pulp and paper making process request pdf. The pulp is then bleached and further processed, depending on the type and grade of paper that is to be produced. The chemical contents including cellulose, lignin, ash, and extractives soluble in alcoholacetone measured 55. The bleached sulphate wood pulp can be used for wood pulp paper such as the highgrade printing paper, drawing paper, offset paper and writing paper. Bamboo as an emerging resource for worldwide pulping and papermaking. The pulp is then passed through a series of screens, and a centrifugelike process to remove larger contaminants such as paper clips, staples, tape, and plastic films that were included in the recovered paper. Valmet provides unique automation solutions for pulp, paper, tissue, energy, marine, and process industries. One common type is called the fourdrinier machine, which was invented in england in 1807. The 4 processes principally used in chemical pulping are kraft, sulfite, neutral sulfite semichemical nssc, and soda. Pulping and papermaking overview video convergence training.
Basic overview of pulp and paper manufacturing process. Pulp and paper pulp is the fibrous mass that results when a pulping process ruptures the bonds in the wood structure that hold the woody cells together. Paper pulping process introduction paper has come a long way before it began to be manufactured in the form in which we now know it. Application of nssc pulping to sugarcane bagasse ahmad samariha a, and alireza khakifirooz b the nssc pulping process was investigated to produce pulp from bagasse for corrugating board manufacture. In this process lignin goes into the reactions with the cooking liquor chemicals and split into fragment. Request pdf pulp and paper making process the paper manufacturing process has several stagesraw material preparation and handling, pulp manufacturing, pulp. The chemical reactions in kraft pulping process pulp paper mill. Paper pulping process introduction paper pulper machine. Obviously, there are 3 kinds of paper pulping process, and each of them demands certain machines. In the paper factory, the pulp is dried and pressed to produce paper sheets.
The fiber extracted from any plant can be used for paper. If you need to make paper pulp for a specific project, plan to mix it at least 12 days in advance so it has time to soak. The kraft pulping and recovery basic process flow pulp mill dale proctor, 2003 white liquor naoh na2s pulp mill cooking washing black liquor turpentine pulp. Hemp is probably one of the oldest plants cultivated for fiber. The book offers a concise yet thorough introduction to the process of papermaking from the production of wood chips to the final testing and use of the paper product. Pulp is made into paper in the paper making process, which roughly can be divided in the following steps see figure 1.
Only about 33% of new paper is made from recycled paper. The kraft process also known as kraft pulping or sulfate process is an industrial process for conversion of wood into wood pulp consisting of almost pure cellulose fibers treatment of wood chips with a mixture of sodium hydroxide and sodium sulfide, known as liquor, that breaks the bonds that link lignin to the cellulose. The pulp and paper mill although there are several chemical and mechanical pulping methods used for delignifying wood table 2l, separating fibers, and removing discoloration, all integrated pulp and paper mills involve the same general steps in the manufacture of pulp and paper. Kraft pulping is the main pulping process together with mechanical. The paper, and the process for making it, was hence given the name kraft which means strength or power in swedish and german. They are also effective at making paper thick, tight, and soft. However, the strength and quality of fiber, and other factors that can complicate the pulping process, varies among tree species. The first 3 display the greatest potential for causing air pollution. As long as you have paper, water, and a kitchen whisk or blender, you can make plenty of paper pulp at home. Dec 31, 2014 sulfate or kraft pulp is one of the chemical pulping processes. Jun 30, 2015 kraft pulping process is the most used pulping process in the world. Although in use since 1879, the kraft pulping process remains the dominant commercial pulping process today. Jul 09, 2017 pulping system is the first stage of paper making process, this system contain pulping, cleaning, screening and refiner, generally our paper pulp machine can save the process of refining, because.
They are chemical pulp, mechanical pulp mp and chemimechanical pulp cmp. Mechanical pulping is the process in which wood is separated or defibrated mechanically into pulp for the paper industry the mechanical pulping processes use wood in the form of logs or chips that are mechanically processes, by grinding stones from logs or in refiners from chips, to separate the fibers. Steps of paper manufacturing processes pulp making process for paper manufacturing. The process of papermaking uses raw materials including water, energy, chemicals and wood chips 1, that contain cellulose.
Pulp and paper manufacturing process in the paper industry. Pulping technology two methods for converting wood to papermaking fibres chemical kraft pulping uses chemical to dissolve lignin from wood to produce nearly pure cellulose fibres 1 ton of tree 0. Today this process is most widely used with a production of 7080% of the total pulp. This paper describes a new technology that costeffectively recovers quality fiber from papers currently being sent to landfill. As to paper pulp manufacturing process, several processes are commonly used to convert logs to wood pulp. Bamboo as an emerging resource for worldwide pulping and.
Cellulose is the fiber component of wood, and exists naturally in most plant life. Sep 04, 2018 this process of transforming the recovered paper materials to pulp is known as pulping. Pulp and paper manufacturing processes in papermaking industry. This module begins with a brief history of papermaking and a discussion on the types of fibers used in the production of paper products. The kraft process also known as kraft pulping or sulfate process is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibers, the main component of paper. Invented in china, from the very beginning it was an important medium of information, back then silk and linen fibers were used in its production. This video introduces the complete stock preparation process of carton board paper, fluting paper and t paper, you can know better about paper.
These fragments dissolved with the solution and wood disintegrates into fiber. Jul 20, 2019 paper pulp can be a useful ingredient in making homemade paper or other crafts. On the process of paper manufacturing process, in order to finally turn the pulp into paper, the pulp is fed or pumped into giant, automated papermaking machines. For example, many paper products are laminated with plastic. The wood pulp is diluted with 100 times its weight. Postuse, an increasing fraction of paper and paper products is recycled. Request pdf brief description of the pulp and paper making process the paper manufacturing process has several stages raw material preparation and. Kraft pulping process is the dominating pulp manufacturing process in the world. In its second edition, handbook of pulping and papermaking is a comprehensive reference for industry and academia.
The main steps of the process are pulping, papermaking and paper finishing. Pulping is done mechanically, thermomechanically, chemically, or with combinations of these treatments. The pulp and paper making processes princeton university. Papers are made with the pulp of the woods, which is an ecofriendly product. Pulping and papermaking introduction and overview james a. How to change pulp to paper in paper manufacturing process. The motivation of this study comes from the necessity to predict the quality of printing on paper or board, especially in the case of images. In the mechanical process, logs are first tumbled in drums to remove the bark.
Request pdf pulp and paper making process the paper manufacturing process has several stagesraw material preparation and handling, pulp manufacturing, pulp washing and screening, chemical. Paper as materials for records nonwoody fibrous materials, wood, groundwood, the soda process, the sulfite process, the sulfate process, other pulping processes, bleaching, stock preparation, the paper machine, coating, calendering and finishing, paper grades and definitions. Pulp making can be done mechanically or chemically. The paper manufacturing process has several stages. The paper making process, the fifth technical brochure from sappi idea exchange idea exchange sappi is committed to helping printers and graphic designers use paper in the best possible way. Kraft process, from german kraft, strong, chemical method for the production of wood pulp that employs a solution of caustic soda and sodium sulfide as the liquor in which the pulpwood is cooked in order to loosen the fibres. Cnbm can design and manufacture pulp and paper production line, all kinds of paper pulping systems and machines. Typical process diagram for paper and pulp production.
900 987 13 675 698 1390 887 934 1136 1031 656 81 661 1040 1039 774 602 421 288 290 1388 122 1426 982 620 443 1146 682 1209 841 675 1414 601 1044 1273 1136 1376 699 577 1412 1102 1286