How does a continuous digester work?
This type of digester is usually applied to sulfate wood pulp making. There is the blade on the bottom of digester, use the moving blade to beat the softened chips into pulp. Cooked pulp is discharged from the digester by internal pressure (about 1.4Mpa), and the pulp is sent into pulp washing process.
How much does a pulp digester cost?
Pulp Digester at Rs 150000/unit | Roorkee | ID: 14193660448.
What is a pulp digester?
Pulp digester or digester, is a large vessel for chemical pulping and dissolved fiber steaming section. As we all know, the raw materials of paper pulp like grasses, bamboo, wood and other sources are cooked in the digester.
What is a kamyr digester?
Abstract. Continuous Kamyr digesters play a pivotal role in the uniformity of product quality in pulp and paper mills. Chemical conversions and separations in the digester are controlled by regulating the Kappa number, a measure of residual lignin in cooked chips.
What is the pulp called after it has been through the digester?
At this point the pulp is known as brown stock because of its color. The combined liquids, known as black liquor (because of its color), contain lignin fragments, carbohydrates from the breakdown of hemicellulose, sodium carbonate, sodium sulfate and other inorganic salts.
How is pulp made?
Pulp is made from breaking down the fibrous part of plants, primarily trees or recycled paper, and refers to the main ingredient in the papermaking process. Pulp made from trees (wood fiber) is the most common source of fiber for papermaking and the base for many paper and wood products.
What is the height of digester in pulp manufacturing process?
Digester For Paper Bag Making Machine The maximum size of the paper pulp digester is 5.8m in diameter and 400m3 in volume.
How tall is a kamyr digester?
The effectiveness of the reactor is measured by the Kappa number which reflects the remaining lignin in the pulp and its yield, Kamyr digesters are relatively large (up to 7 meters in diameter and 70 meters tall) and are characterized by significant time delays (up to 10 hours) due to chip residence times.
What is black liquor used for?
What is Black Liquor? “Black Liquor” is a by-product of pulp from mills that make products from trees, such as paper. It is currently used to recover cooking chemicals and produce high-pressure steam used in the pulp and paper-making process.
What is white liquor made of?
White liquor is a water solution of sodium sulfide and sodium hydroxide. The lignin that binds the cellulose fibers together in the wood is chemically dissolved by this white liquor.
How do pulp mills work?
Gravity and suction is used in fourdriner to reduce the water content to nearly 70%. Hot press rolls squeeze out the water, and then the sheet travels though a large industrial dryer that finally reduces the water content close to 10%. Once out of the dryer, the pulp is cut, pressed, and packaged.
How is cellulose converted to pulp?
To begin the process, the cellulose has to be boiled, beaten, or shredded into tiny fibers. The paper pulp, made up of those tiny fibers is then spread into sheets, pressed, and dried to make paper. Beating the cellulose separates the fibers from each other, while leaving individual fibers intact.
