What is Kraft Paper and What Makes it So Popular?

Kraft paper is found in different forms like the unbleached brown paper of various thicknesses, textures, and colors apart from cardboards and paperboards. Produced using the kraft process, its unique chemical pulp conversion formula makes kraft paper extremely brawny attributed with high elasticity, tear resistance and durability. Unlike usual pulping procedures involving acidic sulfite procedure that typically degrade cellulose causing weaker fibers or mechanical pulping means that leave most lignin with pulp fibers, kraft pulping discards most of the lignin content available in the wood. In essence, the presence of low lignin in the pulp is the basis that adds endurance to kraft papers produced by kraft paper producers.

Kraft Process

Also refers to kraft pulping and sulfate process, the kraft process entails transition of wood into wood pulp containing over 90% of cellulose fibers, which is a major contributing agent producing resilient paper quality irrespective of its thickness. The procedure involves treating of wood and bamboo chips with a blend of water, sodium sulfide, sodium hydroxide also called as ‘ while liquor’, which break, separate lignin and cellulose and produce a solid and smooth wood pulp. The pulp then goes through various other chemical treatments and procedures to reach the final product.

The Uniqueness of Kraft Papers

• First and foremost attribute of kraft paper is that they are much stronger and lasting compared to various other papers available in the industry. The formula of the kraft process that helps reducing lignin content and adding to the sulfur ratio in paper pulp is all that makes it happen.

• Virgin kraft paper supplied by kraft paper suppliers is quite coarse, robust, and boasts high tensile strength. Unsurprisingly, tensile strength is an outstanding paper quality that increases paper elasticity and makes them wear resistant. In fact, in microcrepping procedure, depending on the density required, the paper can be elongated by 4% towards machine direction and 10% in cross-direction without a single cracking in the sheet. This is what makes kraft paper extremely tear resistive in the paper world.

• Kraft process does not require extensive bleaching that not only reduces a paper’s natural strength but also reduces its manufacturing cost.

• Opposed to traditional paper making process that requires selective wood types for making wood pulps, making of kraft paper can be effectively done with different types of woods and bamboos available in abundance. Thus the availability of raw materials is another contributing factor that makes kraft paper low cost and a great option in industrial and commercial applications.

• Another great advantage of kraft paper is that they can be layered with poly plastic that works as a steady barrier against damping, grease, and microbes’ growth. Poly-coated virgin kraft papers have an increasing demand for preparing well-protected paper bags and as a secured approach for covering or layering various items used in commercial, industrial, and domestic purposes.

• One great plus point of the kraft process is its self-sustaining production method that helps in recovering and reusing almost all chemicals adopted in the session. Some of its main byproducts such as turpentine or tall oil that cannot be recycled are mainly utilized in other manufacturing purposes.

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