Multi-step pulp bleaching

a pulp bleaching and multi-step technology, applied in the field of multi-step pulp bleaching, can solve the problems of affecting affecting the quality of pulp fibers used in the original production of waste paper products, and affecting the quality of pulp fibers used in the original production of those waste paper products, and affecting the quality of pulp fibers. the effect of premium virgin or premium recycled fibers
US20080087390A1Inactive Publication Date: 2008-04-17GEORGIA PACIFIC CONSUMER PRODS LP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
GEORGIA PACIFIC CONSUMER PRODS LP
Publication Date
2008-04-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for bleaching cellulosic pulp is disclosed, with one embodiment revealing a three-step bleaching method for cellulosic pulp comprising an activating bleach step, an alkaline peroxide step, and a reductive bleach step. The cellulosic pulp treated according to the present invention may possess a greater GE brightness gain than if treated according to conventional methods, while not suffering a significant loss of lignin. The cellulosic pulp may comprise recycled fibers, including those with high groundwood content. The bleaching method may also decrease the pH of the pulp.
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Description

BACKGROUND OF THE INVENTION

[0001] Methods for bleaching cellulosic fibers, including secondary or recycled fibers, are disclosed. In one embodiment, a method for bleaching recycled pulp fibers increases the brightness of the fibers without significant delignification. In a further embodiment, a method for bleaching cellulosic fibers involves at least two steps. In another embodiment, a method for bleaching cellulosic fibers reduces the pH of the pulp fibers by at least about 2 while also increasing the GE brightness by at least about 9.

[0002] Considerable resources have been invested in determining effective ways to recycle the increasingly vast amount of waste paper generated each day. Presently, almost 100 percent of the highest quality grades of paper, like printer's clippings and white office waste, is recycled. Those grades are considered premium secondary or recycled fiber sources as the original, high quality of the chemically produced virgin paper fibers makes it relatively in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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