Posts Tagged ‘ recycled fibers ’

Overview of the Manufacturing Process for Paper and Board : Part 2

Continued from Part 1 . All components mentioned in Part 1 have to be adequately prepared for optimum use in the papermaking process steps. The additives may be delivered ready for use or may have to be finally prepared according to the requirements in the mill. Fiber stock preparation includes several unit operations depending...
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Introduction

Natural chemical additives have played an important role in the raw material prep¬aration stage since the earliest beginnings of handmade papermaking more than two thousand years ago. Up to the end of the eighteenth century, chemical ad¬ditives from natural resources were used to increase paper strength, to generate better writing and printing characteristics, to...
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Non-fiber Raw Materials For Paper

Pigments as Fillers Mineral fillers have long been used in papermaking. While they can be found in different paper and board grades, printing and writing papers represent by far the most dominant area for their application. Initially, they were added to increase the weight of the sheet and to improve the writing properties. Today,...
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Basic Chemicals For Paper

Wood is a natural composite material and is far more complex than any man-made composite. Wood consists of fibers with lignin as a glue in between, and is thus a “fiber composite material”. The purpose of the pulping process is to separate the wood into individual fibers and to make the fibers suitable for...
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Fibrous Materials for Paper

Fibrous Materials Overview Paper production is mainly based on fibrous raw material which may consist of primary or secondary fibers. Primary fibers are obtained directly from plant raw materials, mainly from wood and annual non-wood plants. Industrially, mostly thinnings and sawmill wastes are used. Secondary fibers are produced from re¬covered paper. Rags are used...
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paper questions