WebSteam separation Washing Bleaching Screening and cleaning Services for mechanical pulping. Recycled fiber. Automation for pulp. ... Our focus is to bring your performance forward utilizing our extensive experience and in-depth knowledge of pulp process technology. Get in touch with our experts through your local Valmet office, or the link below. WebDuring the normal first stage in a modern bleach plant, the unbleached pulp is chlorinated. Three to four percent of gaseous chlorine is rapidly mixed with pulp at a temperature of …

Paper Pulp Bleaching Process Pulp Bleaching Equipment - CNBM

WebKraft pulp is darker than other wood pulps, but it can be bleached to make very white pulp. Fully bleached kraft pulp is used to make high-quality paper where strength, whiteness, … WebBleaching or Brightening Since the raw pulp (brown stock) still contains an appreciable amount of lignin and other discolora- tion, it must be bleached to produce light colored or … cdc driveway

How Is Paper Pulp Made Paper Pulp Manufacturing …

WebIn practice, there are two separate “bleaching” process steps: oxygen delignification and final bleaching. To measure the lignin content in … WebAbstract. The pulp and paper industries are attempting to bring changes to the bleaching process to minimize the use of chlorine to satisfy regulatory and market demands. Xylanases offer a cost-effective way for mills to realize a variety of benefits in bleaching. One main benefit is reducing Adsorbable Organic Halides (AOX) discharge. 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 (similar to, but distinct from brightness) is an important characteristic. These processes and chemistry are also applicable to the … See more Brightness is the amount of incident light reflected from paper under specified conditions, usually reported as the percentage of light reflected, so a higher number means a brighter or whiter paper. In the US, the See more Mechanical pulp retains most of the lignin present in the wood used to make the pulp and thus contain almost as much lignin as they do cellulose … See more Chemical pulps, such as those from the kraft process or sulfite pulping, contain much less lignin than mechanical pulps, (<5% compared to approximately 40%). The goal in … See more • Johan Richter – inventor of the continuous process for bleaching wood pulp • Paper chemicals See more Hydrogen peroxide and sodium dithionite are used to increase the brightness of deinked pulp. The bleaching methods are similar for … See more The bleaching of chemical pulps has the potential to cause significant environmental damage, primarily through the release of … See more but i\u0027m a cheerleader movie cast