What is a paper Kappa?

What is a paper Kappa?

The Kappa number is a measurement of standard potassium permanganate solution that the pulp will consume. The measurement is inflated by the presence of hexenuronic acids in the pulp. These compounds are formed during the chemical pulping process, from the hemicelluloses.

What does Kappa number indicate?

The kappa number is one of the most important parameters measured in chemical pulping. It indicates the pulp delignification degree and is defined as the volume in mL of 0.1 N potassium permanganate solution consumed by 1 g of moisture-free pulp in an acidic medium (Saleem and Akhtar 2002).

How do I find my kappa number?

The kappa number is defined as the volume of 0.02 mole/L potassium permanganate solution consumed by one gram of moisture free pulp in an acidic medium.

How cellulose is processed?

To begin the process, the cellulose has to be boiled, beaten, or shredded into tiny fibers. The paper pulp, made up of those tiny fibers is then spread into sheets, pressed, and dried to make paper. To make strong paper, you need long fibers which is why the pulp has to be beaten instead of chopped.

What is white liquor made of?

White liquor is a water solution of sodium sulfide and sodium hydroxide. The lignin that binds the cellulose fibers together in the wood is chemically dissolved by this white liquor.

What foods are cellulose found in?

Kraft Foods (Stock Quote: KFT) uses cellulose in the following products:

  • Wheat Thins Fiber Selects.
  • Frozen Bagel-Fuls.
  • Macaroni & Cheese Thick ‘n Creamy.
  • Kraft Macaroni & Cheese Three Cheese W/mini-shell Pasta.

What foods are high in cellulose?

High levels of cellulose are found in root and leafy vegetables, legumes, and some fruits such as pears and apples. Lignin content is highest in fruits, particularly strawberries and peaches, whereas pectin levels are highest in citrus fruits and apples.

What do you need to know about the Kappa number?

What Is the Kappa Number? The Kappa number is an assessment of how much lignin is present in pulp, which determines the amount of bleach that needs to be added to it if the goal is a white processed paper product. High Kappa numbers require more bleach, while lower numbers have less lignin and need less bleach.

How to make Kappa number of pulp paper?

Collect the pulp sample and air dry them. Take 1gm air-dried pulp sample and 650ml distilled water into a two liter beaker. Disintegrate the pulp with this water so that no fiber bundles exist. Add 25ml 4/N H 2 SO 4 acid. Add 25 ml N/10 KMnO 4 solution then wait for 5 minutes.

What is the Kappa number for corrugated fiberboard?

It is approximately proportional to the residual lignin content of the pulp. K: Kappa number; c: constant ≈ 6,57 (dependent on process and wood ); l: lignin content in percent The Kappa number for bleachable pulps are in the range of 25-30, sack paper pulps in the range 45-55 and pulps for corrugated fiberboard are in the range 60-110.

How is the Kappa number used in bleaching?

The Kappa number estimates the amount of chemicals required during bleaching of wood pulp to obtain a pulp with a given degree of whiteness. Since the amount of bleach needed is related to the lignin content of the pulp, the Kappa number can be used to monitor the effectiveness of the lignin-extraction phase of the pulping process.

Back To Top