Bleaching of wood pulp is the chemical processing of wood pulp to lighten its color and whiten the pulp. The primary product of wood pulp is paper, for which whiteness is an important characteristic. These processes and chemistry are also applicable to the bleaching of nonwood pulps, such as those made from bamboo or kenaf.

Making. Put the waste paper into the pulp making machine, then add water and other raw materials into the pulp making machine. Smash them into pulp. This process is equivalent to the recycle of waste paper, which is the first step to make egg trays. Molding refers to the step that convey the pulp into molding machine through pipeline.

Apr 04, 2014· Screening of the pulp after pulping is a process whereby the pulp is separated from large shives, knots, dirt and other undigested residues. The accept is the pulp. The material separated from the pulp is called reject.

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.

Overall, the pulp and paper making process is water intensive: the pulp and paper industry is the largest industrial process water user in the In 1988, a typical pulp and paper mill used 16,000 to 17,000 gallons of water per ton of pulp produced.

The Kraft Pulping and Recovery Process Flow Diagram Caustic Plant Power Plant Pulp Mill Black Liquor Green ... The Kraft Chemical Recovery Process Flow Diagram Pulp Mill. The Kraft Caustic Plant Process Flow Diagram Dregs Washer or Filter Slaker Causticizers Green Liquor Clarifier White

Oct 27, 2019· Pulp making process for paper manufacturing. In the chemical process, wood chips from debarked logs are cooked in a chemical solution. This is done in huge vats called cooking digesters. The chips are fed into the digester, and then boiled at high pressure in a .

Sep 06, 2013· Making Paper at Home Making paper yourself is a bit timeconsuming but not especially complicated, and you probably have most or all of the necessary raw materials. By Marrianne Saddington

Mar 15, 2017· Pulp and paper mills are highly complex and integrate many different process areas including Raw material preparation (wood debarking and chips preparation); Pulping (including cooking or refining, washing, screening and cleaning and thickening); Pulp bleaching (if required) and Paper making.

Paper. Remember that stuff? It's more than a surface to paint on. In fact, papermaking is an art medium in its own right. Hong Hong is an interdisciplinary artist who creates large scale pulp paintings that are a mustsee. Based in Connecticut and upstate New York, her handmade paper works are the relics of a performative process of pouring pulps into a special modular mould.

The pulp process involves many production stages, usually coupled with intermediate storage tanks. As each stage has a different reliability and bottlenecks may vary from day to day, scheduling a pulp mill needs to take into account these bottlenecks and the probability of a disturbance or breakdown.

The Pulp Making Machine Manufacturing Process: Making paper pulp: put the raw material( waste paper) and water into pool. Use the hydrapulper to mix the material into paper pulp. In the mixing process, you should make sure appropriate concentration of slurry, high .

The Full paper making process . Timber. DeBarker. Chipping Machine. Chemical Pulping Process. Mechanical Pulping Process. Hydrapulper. Blend Chest. Waste Paper. Deinking. Refining. Screening and Cleaning. Papermaking Machine. Conversion and

The process of waste paper recycling most often involves mixing used/old paper with water and chemicals to break it down. It is then chopped up and heated, which breaks it down further into strands of cellulose, a type of organic plant material; this resulting mixture is called pulp, or slurry.

Chemical Recovery in Pulp and Paper Industry With today's increasingly high energy and chemical costs and stringent environmental regulations, the need for improved recovery of chemicals from the pulp and paper making process has become a critical economic factor in the industry.

Wood pulp is an important product used in the paper making process. Yet, it wasn't used in the process until around 1850 when a German by the name of Friedrich Gottlob Keller experimented with crushing wood with a wet grindstone in order to obtain wood pulp.

The wood fibres are separated and, to a considerable degree, fragmented. Chemical wood pulp is made by cooking wood chips with chemical solutions in digesters operated at elevated temperature and pressure. The chemicals used are (1) sulfite salts with an excess of sulfur dioxide and (2) caustic soda and sodium sulfide (the kraft process).

For every ton of pulp produced, the kraft pulping process produces about 10 tons of weak black liquor or about tons of black liquor dry solids that need to be processed through the chemical recovery process. This paper discusses the basic steps in the kraft recovery process, problems encountered and challenges in recovery