By Pratima Bajpai
ISBN-10: 0128034114
ISBN-13: 9780128034118
ISBN-10: 0128034289
ISBN-13: 9780128034286
Pulp and Paper undefined: strength Conservation presents a couple of energy-efficient applied sciences and practices which are economical and on hand for implementation this day. rising energy-efficient applied sciences and destiny clients during this box also are handled. Qualitative and quantitative results/data on power mark downs for numerous steps of pulp and paper making procedure are provided. there is not any particular ebook in this subject. this can be a accomplished reference within the field.
- Thorough and in-depth assurance of energy-efficient applied sciences and practices in paper and pulp industry
- Presents reasonably-priced and on hand for implementation at the present time technologies
- Discusses Biotechnological techniques, specifically enzymatic strategies within the pulp and paper to lessen the strength intake and increase the product quality
- Presents qualitative and quantitative results/data on strength rate reductions for varied steps of pulp and paper making process
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Additional info for Pulp and paper industry : energy conservation
Example text
The mixture is then preheated at 120–130°C and refining follows. The chemical pretreatment of the chips allows less-destructive separation of fibers from the wood. This results in a higher, longer-fiber content and a much lower-shive content. Other advantages of CTMP in comparison to TMP are that CTMP delivers more flexible fibers providing higher sheet density and higher burst and tensile strength. It also provides a higher brightness before bleaching. When compared to bleached softwood kraft, CTMP has a better opacity and tear strength but shows color reversion.
Full bleaching of mechanical pulps is generally not practical due to bleaching chemical cost and the negative impact on pulp yield. Deinked secondary fibers are usually bleached in a bleach tower, but may be bleached during the repulping process. Bleach chemicals may be added directly into the pulper. The following are examples of chemicals used to bleach deinked secondary fibers: hypochlorite, hydrogen peroxide, and hydrosulphite. 6 Pulp Drying The pulp must be dried in cases where the pulp and paper mills are not located in the same place or when a temporary imbalance between pulp production and paper machine requirements occurs.
Despite variations in their construction, all of these papermaking machines consist of the same basic elements: • • • • • Headbox Wire section Press section Dryer section Reel Pulp and Paper Production Processes and Energy Overview 29 The actual design of these elements depends on the type of paper being made. The speeds of the individual machines also vary significantly: however, up to 1400 m of paper per min can be produced. The function of the headbox is to evenly spread the highly diluted fiber mixture over the entire breadth of the papermaking machine.
Pulp and paper industry : energy conservation by Pratima Bajpai
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