Bamboo pulp making can be simply classified into materials preparation, pulp cooking, pulp washing and pulp bleaching
Materials Preparation
Due to the seasonality of bamboo cutting, for ensuring the continuous production, the pulp mill must stock a certain amount of bamboo. Generally, the bamboo storage capacity should be used for 3-6 months. New bamboo should be dried by the air and de-greening. As for the stacking and unstacking of the bamboo bundle, portable belt conveyor and loader will be the best helper.
After bamboo bundle enters the pulp mill, it is cut into bamboo chips by the bamboo cutter and is stored with other chips. The size of bamboo chips is 10-25mm.
When the bamboo is stored in the open system, the position in the process should be designed according to the principle of first screening and last storage. This kind of principle can remove the bamboo sawdust from the screening bamboo chips. The fermentation and mildew of bamboo chips are avoidable in the storage of bamboo. The qualified bamboo chips are sent to storage. The long bamboo will be back to bamboo cutter and sawdust will be used as waste and burned in the boiler. The stored bamboo chips are used in according with the first-in-first-out principle. Ensuring the full use of bamboo chips and avoids the stored bamboo chips go bad because of long-term storage. It is necessary to wash bamboo chips in the process of materials preparation. Remove the loam among the bamboo chips, which reduce the wearing, scaling of paper pulper and silicon interference.
Bamboo Pulp Cooking
The qualified bamboo chips in the preparation through the conveyor enter into the pulper. After bamboo feed into pulper, pour the black liquor from the bottom of pulper, presoak the bamboo chips, and remove the air from the bamboo chips. Use the high-temperature black liquor and hot white liquor displace the black liquor in the pulper. Control the temperature in the pulper up to 145℃, and heat the pulper with steam, raise the temperature to the cooking temperature and keep it. When the reaction reaches the settled H factor, send the warm and weak black liquor of pulp washing process into the bottom of pulper, displace the high-temperature black liquor and reduce the temperature in the pulper to 100℃. For bamboo pulp making, it generally adopts kraft process. The kraft process has high digester yield, high strength, less pollution, soft fiber, and mature technology of alkali recovery. Compared to the wood, the bamboo is easier to cook because of its composition. The paper pulper machine adopts the vertical and continuous pulp digester. In general, the cold blow is typical choice, it not only recovery the rest heat, but also avoid the leakage of flue gas. Besides, reduce the steam consumption and pyrolysis of pulp, improve the strength of the fiber. In the real bamboo pulp processing, due to the dense structure of bamboo and the difficulty of air removing in the conduit, bamboo pulp cooking require longer penetration time. Penetration time for raising temperature is 1.5-2h, penetration time for keeping temperature is 2-2.5h. As we all know, there are vertical pulper and horizontal pulper. Different specifications of pulpers for bamboo pulp making as below:
Bamboo Pulp Washing and Screening
The practice has proven that bamboo fiber is long, and it has good drainability. The bamboo pulp is easier to wash compared with other straw pulp, even the hardwood pulp. The common equipment for bamboo pulp washing process includes vacuum washer, pressure pulp washer, and Horizontal belt filter. Generally, the large-scale bamboo pulp production line can use twin roll press or DD washer. Vacuum washer is more suitable in overall consideration.Bamboo pulp screening and cleaning mainly remove the crude residue, dust, sand. Bamboo pulp making will produce a lot of crude residues, they are the knots that are not cooked sufficiently. These crude residues are not suitable to cook or produce a bad influence on the bamboo paper quality. The bamboo pulp washing adopts multi-section countercurrent washing can efficiently extract black liquor and ensure the alkali recovery. The bamboo pulp adopts close screening system, screening concentrations are 2-3%. This type of technical combination save water, reduce the pollution and require less treatment of slurry-residue.
Bamboo Pulp Bleaching
The pulp bleaching is used to improve the pulp whiteness, keep the strength of bamboo pulp and reduce the pollution. Because the oxygen delignification and medium consistency technology mature gradually, bleaching process is the short process with 3-4 stages. To meet the strict requirement of environmental protection, bleach agent uses chlorine dioxide to replace. As for the choice of bleaching, there are ECF, TCF, EPP, ZXP, TCF, ECF, CEH, and etc. Currently, the ECF is still the best popular and efficient pulp bleaching process. But from the economic considerations, CEH is more applicable.
Advantages of Bamboo Pulp
Bamboo pulp has medium-length fiber, so it is thin and soft, and also has high bulk and tearing strength, low tensile index and burst index. If you are interested in sourcing bamboo pulp making machinery and equipment from China, please feel free to contact us for details.
Showing posts with label bamboo pulp making. Show all posts
Showing posts with label bamboo pulp making. Show all posts
Tuesday, 7 January 2020
What is bamboo pulp
The bamboo pulp is one kind of paper pulp like wood pulp, straw pulp or reed pulp. The bamboo pulp is usually made from moso bamboo, phyllostachys pubescens and sinocalamus affinis by sulfate digestion process or soda process. The unbleached bamboo paper is generally applied to package paper-making.
Bamboo pulp can be made into bamboo paper. Bamboo paper is strong and it has wide applications. The bleached bamboo paper is used to manufacture offset paper,typing paper and high-grade culture paper. The unbleached bamboo paper is generally applied to package papermaking. Besides, bamboo pulp and wood pulp can be mixed and used to make cable paper, insulation paper, and cement bag paper.
Bamboo pulp is a viscous solution of bamboo fibers, water, and chemicals used to produce paper and fabrics. Bamboo is a woody, perennial plant belonging to the grass family, which features fibers similar to softwoods in terms of length and strength. The fibers also possess strong anti-bacterial qualities which greatly enhance the properties of items manufactured from bamboo pulp. The pulp is produced in much the same way as wood pulps, with several processes pulping both hard and soft wood varieties in tandem with bamboo. The process involves reducing finely-chipped bamboo to a pulp by“cooking”the chips under pressure in a water and chemical solution in a pressure vessel.
Bamboo is a fast-growing, evergreen plant belonging to the botanical family of grasses. It has long been used as a construction material and as a source of implements, weapons, and ornaments in several global regions, particularly in Asia. In these regions, bamboo pulp has also been used to make high-grade papers for many years. Recent green trends have, however, seen significant amounts of attention paid to the many uses of the plant in other world regions. The fact that many bamboo species grow up to 3.3 feet (1 meter) per day along with several noteworthy physical properties make bamboo an extremely attractive and highly sustainable source of many end products, including bamboo pulp for the manufacture of textiles and paper.
In terms of length and strength, the fibers of bamboo plants are similar to those of softwoods, such as pine and fir, traditionally used to produce the wood pulps destined for paper manufacture. In fact, bamboo is often pulped in tandem with both soft and hard wood varieties due to these similarities. The bamboo fibers also possess anti-bacterial qualities that prevent the formation and spread of bacteria and mildew in fabrics and paper produced from bamboo pulp. In addition, bamboo fibers contain high concentrations of cellulose resulting in strong, robust end products.
The manufacture of bamboo pulp involves chipping the bamboo stems to form a fine aggregate. The chips are then “cooked,” or heated under pressure, in a vessel known as a digester in a solution of water and chemicals. This process breaks the fibers down into a viscous pulp which, when completely digested, is subjected to several clarification stages to remove the chemicals and suspended impurities. The pulp is then dried by drawing residual water from the pulp by means of a vacuum pump and allowing the resultant semi-moist mass to either dry in a batch oven or naturally in the open air. At this point, the dry pulp is compacted into sheets or bales in readiness for distribution.
Bamboo pulp can be made into bamboo paper. Bamboo paper is strong and it has wide applications. The bleached bamboo paper is used to manufacture offset paper,typing paper and high-grade culture paper. The unbleached bamboo paper is generally applied to package papermaking. Besides, bamboo pulp and wood pulp can be mixed and used to make cable paper, insulation paper, and cement bag paper.
Bamboo pulp is a viscous solution of bamboo fibers, water, and chemicals used to produce paper and fabrics. Bamboo is a woody, perennial plant belonging to the grass family, which features fibers similar to softwoods in terms of length and strength. The fibers also possess strong anti-bacterial qualities which greatly enhance the properties of items manufactured from bamboo pulp. The pulp is produced in much the same way as wood pulps, with several processes pulping both hard and soft wood varieties in tandem with bamboo. The process involves reducing finely-chipped bamboo to a pulp by“cooking”the chips under pressure in a water and chemical solution in a pressure vessel.
Bamboo is a fast-growing, evergreen plant belonging to the botanical family of grasses. It has long been used as a construction material and as a source of implements, weapons, and ornaments in several global regions, particularly in Asia. In these regions, bamboo pulp has also been used to make high-grade papers for many years. Recent green trends have, however, seen significant amounts of attention paid to the many uses of the plant in other world regions. The fact that many bamboo species grow up to 3.3 feet (1 meter) per day along with several noteworthy physical properties make bamboo an extremely attractive and highly sustainable source of many end products, including bamboo pulp for the manufacture of textiles and paper.
In terms of length and strength, the fibers of bamboo plants are similar to those of softwoods, such as pine and fir, traditionally used to produce the wood pulps destined for paper manufacture. In fact, bamboo is often pulped in tandem with both soft and hard wood varieties due to these similarities. The bamboo fibers also possess anti-bacterial qualities that prevent the formation and spread of bacteria and mildew in fabrics and paper produced from bamboo pulp. In addition, bamboo fibers contain high concentrations of cellulose resulting in strong, robust end products.
The manufacture of bamboo pulp involves chipping the bamboo stems to form a fine aggregate. The chips are then “cooked,” or heated under pressure, in a vessel known as a digester in a solution of water and chemicals. This process breaks the fibers down into a viscous pulp which, when completely digested, is subjected to several clarification stages to remove the chemicals and suspended impurities. The pulp is then dried by drawing residual water from the pulp by means of a vacuum pump and allowing the resultant semi-moist mass to either dry in a batch oven or naturally in the open air. At this point, the dry pulp is compacted into sheets or bales in readiness for distribution.
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