Pulping & Recovery Process Art J. Ragauskas Institute of Paper Science and Technology Georgia Institute of Technology. The process has been used since 1890, but only gained popularity after an efficient recovery system was developed in 1930. Kraft paper or kraft is paper or paperboard (cardboard) produced from chemical pulp produced in the kraft process.. Sack kraft paper, or just sack paper, is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability.. Kraft process is the foremost pulping process in the board and paper industry and the biggest lignin supplier.
In Kraft pulping process, cooking liquor chemicals are NaOH and Na2S. The kraft process, sometimes called “Kraft Pulping” or the “Sulfate Process,” is the process by which wood is turned into wood pulp, the main component of the paper. Approximately 130 million t of kraft pulp is generated annually. 4. Kraft paper is one of the most common types of paper and it is utilised within a variety of industries. Globally, kraft process is the dominant technology of paper and pulp industry. The reaction is reversible and can be described as below: Manufacturing process.

GASCOGNE PAPIER is an integrated producer of natural unbleached Kraft paper. Kraft manufacturing is a zero-waste process with minimum environmental impact. Approximately 130 million t of kraft pulp is generated annually.
Although the high percentages of sodium sulfide darken the pulp color but it has huge benefits; it increase penetration of the wood, uniform cooking, low cooking time, high yield and strength.

Since lignin doesn’t make good paper, it must be separated from the cellulose. The plant is located near its natural resource and its raw materials are sourced within 50 km to 60 km from the site.

PULP & PAPER; Pulp; Kraft pulp; Kraft pulp Technologies for every major pulping, recovery, and power process . In Kraft pulping process, cooking liquor chemicals are NaOH and Na2S. Kraft paper is a kind of paper made by a chemical pulping process known as the kraft process. This includes such things as printing and writing papers; tissues, coffee filters and other consumer products; and specialized applications like fibre cement and Japanese washi paper. The kraft process, which uses sodium hydroxide (NaOH) and sodium sulphide (Na2S) to pulp wood, is the dominant pulping process in the pulp and paper industry. Although the high percentages of sodium sulfide darken the pulp color but it has huge benefits; it increase penetration of the wood, uniform cooking, low cooking time, high yield and strength. In Kraft pulping process, cooking liquor chemicals are NaOH and Na2S. Developed in 1879 by Carl F. Dahl, a patent was issued five years later, and the first kraft paper-making company opened its doors in Sweden in 1890. Kraft paper isn’t always brown, however. • 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 Na2S hydrolyzed in presence of water and gives hydroxide and hydrosulfide. Today this process is most widely used with a production of 70-80% of the total Pulp. Globally, kraft process is the dominant technology of paper and pulp industry. Kraft pulping process is the dominating pulp manufacturing process in the world. Using a process that involves pulverizing the wood pulp and blending the material into large sheets of strong brown … Most of the water removed from paper web. In kraft process, the wood chips are pretreated at 170°C for about 2 h in an aqueous solution of sodium hydroxide and sodium sulfide. Kraft paper or kraft is paper or paperboard (cardboard) produced from chemical pulp produced in the kraft process.. Sack kraft paper, or just sack paper, is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability.. And to do this within tight environmental regulations. • Soda recovery via incineration patented, 1865.