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Dislodge and remove as much lignin
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- The objective of pulping is to dislodge and remove as much lignin while maintaining the fiber structure.
www.sciencedirect.com/topics/agricultural-and-biological-sciences/pulping
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Pulping. The primary purpose of pulping is to defiber the paper into its constituent fibers without significantly degrading contaminants. Important parameters in pulping include stock consistency, temperature, pulping intensity, pH, and pulper configuration.
- Chemical Pulping
Chemical pulping is the predominant process that is...
- Kraft Process
The Kraft pulping process involves the digestion of wood...
- Mechanical Pulp
Mechanical pulping accounts for about 25% of the wood pulp...
- Pulping Process
Pulping is the process of breaking down paper (or wood) into...
- Pulping
Pulping refers to different processes to convert wood or...
- Chemical Pulping
Pulping is the process of breaking down paper (or wood) into individual fibers with the help of an elevated temperature (40–55 °C), alkaline pH (9.0–10.5), and mechanical force. During the pulping process of MSW paper, fibers flex, bend, and rub against one another to promote ink removal.
Jan 3, 2021 · The main objective of chemical pulping is to treat wood chips with chemicals in an aqueous solution at an elevated temperature and pressure to remove hemicellulose and lignin while leaving cellulose fibers intact .
- Drake Mboowa
- dmbooowa@mail.ubc.ca
- 2021
- 1 Chemical Pulping
- 2 Mechanical Pulping
- 3 Semi-Chemical Pulping
- 4 Secondary Fibre Pulping
- 5 Dissolving Kraft and Sulphite Pulping Processes
- 6 Non-Wood Pulping
Chemical pulping (i.e., kraft, soda, and sulphite) involves “cooking” of raw materials (example, wood chips) using aqueous chemical solutions and elevated temperature and pressure to extract pulp fibres. Chemical pulps are made by cooking the raw materials, using the kraft (sulphate) and sulphite processes (Casey 1983a). Kraft pulping is by far the...
There are three main categories of mechanical pulp: groundwood pulp, refining pulp, and chemi-mechanical pulp. In both the grinding and refining processes, the temperature is increased to soften the lignin. This breaks the bonds between the fibres (Gullichsen 2000; Casey 1983b). Groundwood pulp shows favorable properties with respect to brightness ...
Semi-chemical pulping uses a combination of chemical and mechanical (i.e., grinding) energy to extract pulp fibres. Wood chips first are partially softened in a digester with chemicals, steam, and heat. Once chips are softened, mechanical methods complete the pulping process. The pulp is washed after digestion to remove cooking liquor chemicals and...
Recovered paper has become an increasingly important source of fibre for papermaking (Bajpai 2013). Currently, nearly 50 % of the fibre raw material for papermaking is based on recycled fibre. In the recycling process, recycled paper or paperboard is rewetted and reduced to pulp, principally by mechanical means. Inks, adhesives, and other contamina...
Dissolving kraft and sulphite pulping processes are used to produce highly bleached and purified wood pulp suitable for conversion into products such as rayon, viscose, acetate, and cellophane (EPA 2002).
Worldwide, non-wood sources make up about 6 % of the total fibre supply for papermaking. Non-wood fibres are derived from agricultural fibres such as straw and other plant fibres such as bamboo, bagasse, and annual fibre crops such as kenaf (Ince 2004). In general, non-wood plant fibres are more costly to collect and process than wood fibre in regi...
- Pratima Bajpai
- 2015
Pulping refers to different processes to convert wood or other fibrous feedstocks into a product mass of liberated fibers by releasing lignin that binds the cellulosic fibers together. From: Encyclopedia of Analytical Science (Third Edition), 2019
Feb 6, 2023 · The most important mechanical pulping processes are stone groundwood pulping, pressure groundwood pulping, thermomechanical pulping or chemithermomechanical pulping. Wood is ground into pulp during the groundwood pulping process.
The kraft pulping process is a complex and important method for producing pulp from wood chips or other lignocellulosic materials. The process involves cooking the wood in an alkaline solution to break down the lignin and separate the cellulose fibers, which are used to produce paper products.
