What Is Kraft Paper?
Time:2024-09-02
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First and foremost, Kraft paper is made from wood, just like most other paper types. The term "Kraft" describes the process of turning wood into wood pulp, essentially by pressure-cooking softwood chips in a mixture of strong alkaline chemicals.
These chemicals, notably sodium hydroxide and sodium sulphide, separate the cellulose (which is useful) and lignin (not so useful) that make up the wood fibers. Think about when you make instant noodles, at first the noodles are hard and packed tightly together, just like the wood. As you apply hot water, the noodles become soft and separate, that‘s kind of what happens here but on a microscopic level.
This kraft paper slurry is then refined, washed and formed through huge pressurized rollers.
As the kraft paper gets drawn out and dried, it is stored into colossal rolls, ready for cutting down. At this point, we have a light-brown cellulose pulp with interlocking fibers, otherwise known as brown kraft paper.
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