Paper on Paper

497 WordsOct 9, 20132 Pages
The paper making process isn’t as simple as you think. They don’t just take a tree and slice it really thin to make the sheets of paper. It is a much more complex process to get the paper we write on, print on, and even dry our hands on. The process begins with collecting the trees, rags or even grasses. From here if the paper is made from trees they go into a revolving drum that removes all bark. The bark is used for other things but not paper. Then the debarked trees are sent through something similar to a wood chipper, but smaller. Then the chips are “digested”. The digestion process can differ from chemical, to mechanical. The chemical process separates lignin from cellulose fibers. This is accomplished by dissolving lignin in a cooking liquor, so that it may be washed from the cellulose fibers. This preserves the length of the cellulose fibers. The pulp can also be bleached to produce white paper, but this consumes 5% of the fibers. Chemical pulping processes are not used to make paper made from cotton, which is already 90% cellulose. There are 3 main chemical pulping processes. Such as Kraft, Sulfite and Soda. The Kraft process is the most commonly used because it creates heat, which can be used to run a generator. The Kraft process begins with making the wood small chips. From here the chips are wetted and preheated with steam, they do this to expel excess air from the wood chips. The next step is to impregnate the chips with black and white liquor. Once the liquor is introduced the air remaining becomes trapped. Once this has been done the chips go into a digestion process. The digestion process essentially cooks the wood. This is done to release the soluble fragments into the basic liquid. In this process chemicals are introduced to severe the ether bonds. It comes out looking brown, this is where its got it’s name brown stock. Once that process is

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