主页 > 词条 > 拉丁美洲西班牙语 (XL) > elaboración de pulpa kraft
elaboración de pulpa kraft
Kraft pulping involves cooking (digesting) wood chips in an alkaline solution (sodium hydroxide, hydrosulfide, and sodium sulfide) for several hours during which time the chemicals attack the lignin in the wood. The dissolved lignin is later removed leaving behind the cellulose fibres. Unbleached kraft pulp is dark brown in colour, so before it can be used in many papermaking applications it must undergo a series of bleaching processes.
0
0
完善词条
您想要说什么?
新闻词条
精选词条
Floyd Mayweather
Born Floyd Sinclair on February 24, 1977, an American professional boxer. He is a five-division world champion, where he won nine world titles in five ...