PKSC 1020 Lecture Notes - Lecture 4: Sulfite, Paperboard

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PKSC 1020 30 January 2017
Heather Batt
Lecture Notes Pulp and Paper Making
Ways to Make Pulp
1. Mechanical (Ground wood)
This method is the least expensive for 2 reasons…
a. It doesn’t use chemicals to do the processing
b. It uses all of the wood and doesn’t waste any scraps
- The wood that’s made using the mechanical method tends to have a low
brightness, meaning that the paper has a grayish tint, and a lower strength.
- Pulp made using this method is also usually combined with other pulps to make
its products both stronger and brighter.
2. Chemical
Pulp produced using the mechanical method often has a higher quality than
Mechanical pulp because it utilizes chemical to give it the properties that natural
wood doesn’t possess
The three chemicals that are used in this process are…
- Sulfate- this is the most widely used chemical for this process, and is
sometimes called Kraft, which is the German word for strength. (Ex: Paper
grocery bags, white paper that wraps meat)
- Sulfite this is the second most common chemical, and is often known for
the foul smell is paper factories
- Soda - not commonly used for paper products but rather agricultural
products, however because it is able to reduce environmental hazards some
paper factories opt for soda
3. Semi-Chemical
This process requires wood to be cooked in chemicals and grinded in disc refiner,
utilizing parts of both the mechanical methods and chemical methods.
Not used much except for corrugated media
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