Unit_6_-_Paper_and_Paperboard

Unit_6_-_Paper_and_Paperboard - ingredient in papermaking....

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6.5.1 Raw Materials The primary raw material for packaging paper and paperboard is wood. Other materials, such as rags, straws, and grasses can be used, but they are less common. Recycled paper is an increasingly important feedstock for paper manufacturing; however, here we will just focus on wood as the feedstock. The first step is harvesting the wood. Wood can be delivered to the paper mill either as logs or as wood chips. At some point the bark is removed because it is not a desirable
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Unformatted text preview: ingredient in papermaking. Paper can be made from either hardwoods or softwoods, but softwoods are generally more desirable, especially in packaging applications because they have longer fibers which can overlap and interlock better. Here is a comparison paper made of softwood and hardwood fibers: Paper Fibers...
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This note was uploaded on 03/04/2012 for the course PKG 101 taught by Professor Haroldhughes during the Spring '08 term at Michigan State University.

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