Most people see and use Bamboo pulp paper, but they do not watch the proccessing, and think it them as the bagasse pulp paper, wood pulp paper, straw pulp paper,and other pulp paper.To help them undersand how to get Bamboo pulp paper. we are enjoy in introducing briefly as following:
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The proccess can be simply classified into
1.materials preparation,
2.pulp cooking,
3.pulp washing,
4.pulp bleaching,
5. processing and cutting.
Let me introduce it step by step to you.
Materials preparation
1. Due to the seasonality of bamboo cutting, for ensuring the continuous production, the pulp mill must stock many bamboo. Generally, the bamboo storage capacity should be used for 3-6 months and more. New bamboo should be dried by the nature air drying to de-greening , and get more better bamboo paper.
2. After the bamboo bundle enters the pulp mill or at the bamboo site, it is cut into bamboo chips by the bamboo cutter and is stored with other chips. The size of bamboo chips is 10-25mm or to the factory option according to the product whether tight or not.
3. 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.
4. 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.
5. The stored bamboo chips are used according to the first-in-first-out principle (FIFO principle). Ensuring the full use and manage of bamboo chips and avoids the stored bamboo chips go bad because of long-term storage .
6. 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,and keep the paper no hole.
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 the 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 the pulp washing process into the bottom of the pulper, displace the high-temperature black liquor and reduce the temperature in the pulper to 100&#;.
1. For bamboo pulp making, it generally adopts the kraft process. The kraft process has high digester yield, high strength, less pollution, soft fiber, and mature technology of alkali recovery. Compared to wood, bamboo is easier to cook because of its composition.
2. The paper pulper machine adopts the vertical and continuous pulp digester. In general, the cold blow is a typical choice, it not only recovery the rest heat, but also avoids the leakage of flue gas. Besides, reduce the steam consumption and pyrolysis of pulp, improve the strength of the fiber, and keep the balance of quality.
3. 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 requires longer penetration time. Penetration time for raising the temperature is 1.5-2h, penetration time for keeping temperature is 2.5-3h. As we all know, there are vertical pulper and horizontal pulper. Different specifications of pulpers for bamboo pulp making as below:
We can get a conclusion according to the above specifications that vertical pulper is more applicable.
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 the bamboo pulp washing process includes vacuum washer, pressure pulp washer, and Horizontal belt filter. Generally, the large-scale bamboo pulp production line can use a twin roll press or DD washer. Vacuum washer is more suitable in overall consideration.
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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 bad influence on bamboo paper quality.
The bamboo pulp washing adopts multi-section countercurrent washing that 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 saves water, reduce pollution, and require less treatment of slurry-residue.
Recommend machines:
1. vacuum drum washer
2. twin roll press
3. single screw press
4. disc filter
Bamboo pulp bleaching
The pulp bleaching is used to improve the pulp whiteness, keep the strength of bamboo pulp, and reduce pollution. Because the oxygen delignification and medium consistency technology mature gradually, the bleaching process is the short process with 3-4 stages. To meet the strict requirement of environmental protection, the 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.
processing and cutting
General paper size, packaging method, processing speed, width, etc. will be encountered at the end of paper processing, which is mainly customized according to customer needs. Large paper product processing parks/factories such as Chengdu Qingya Paper Co., Ltd. have a huge post-processing process, which greatly satisfies the current people's use of different paper products. At the beginning, it is basically produced as base paper of different thicknesses, and then combined into professional paper raw materials with different layers and thicknesses, and then cut, laminated, pasted, printed, and packaged to obtain our final product. Like cartons, packaging paper, kitchen paper, toilet paper, toilet paper. Of course, there are also food lunch boxes that are a little different from this process. Generally, they are processed into paddle boards for easy transportation and sent to the destination country for secondary chewing and then die-casting.
Advantages of bamboo pulp paper
§ 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.
§ Wide raw material sources.
§ Simple pulp processing required.
§ High market potential.
Chengdu Qingya Paper Industries Co.,Ltd is a manufacturer of Eco-friendly paper products, Such as Bamboo pulp, Bagasse pulp, Bamboo jumbo roll, Bamboo tissue paper, wrapping paper, Bamboo toilet roll, and Bamboo Kraft paper for more than 20 years,helping their customers shorter their own paper pulp production line , reduce investment cost, and get the high profit more early and support better service experience for the paper end customer in their local market .
If you have any interested in process, wholesale and other custom needs, welcome to contact us. Paper process OEM/ODM accepted.
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