It is generally brown and has a variety of types, including ordinary kraft cardboard, single sided kraft cardboard, etc. It is used for packaging paper in electronic factories, food packaging, and other industries.

White face index

Tightness: minimum 0.74g/cm3, burst index (strength): minimum (2.9-2.5) Kpa.m2/g

Lateral ring pressure index: (strength) minimum (8.0-11.0) N.m/g

Water absorption: 35/45g/m2

Usage issues

1. Insufficient strength indicators result in insufficient compressive performance of the cardboard box.

2. The paper surface at the folding point of the cardboard box has broken and burst.

3. Paper defects cause inaccurate printing dots.

4. Horizontal defects in the paper cause unstable operation of the cardboard box production line during use.

The commonly used specifications for kraft paper are drum widths of 787mm, 889mm, 1092mm, and 1194mm. The flat plate specifications are generally 787mm * 1092mm and 889mm * 1194mm. These are all relatively conventional and stable sources of goods. Food grade kraft paper weighs in grams, with a roll width of 440 546 534 610 895mm and a weight range of 45 to 65 grams. The specifications and weight of packaging paper mainly range from 600mm to 1600mm, and from 60g to 100g. The thickness of kraft paper, the weight of kraft paper is related to its thickness, and generally, the thickness of high weight kraft paper is thicker. The pressure of fiber arrangement and pressing during molding, as well as the differences in fiber raw materials, can affect the loose thickness. Perhaps the simplest way is to adjust the thickness through pressing changes. The greater the pressure, the smaller the thickness. The coefficient for calculating the thickness of kraft paper is 100 grams per square meter, which is 0.126 millimeters (under normal circumstances). Uneven thickness of each sheet of paper can also lead to inaccurate overprinting and varying depth of imprints. When the thickness of the same sheet is uneven, it is more likely to cause unclear text and inconsistent colors. The control of all thicknesses is very important. The grain of kraft paper, a roll of paper, has width and length. Width refers to the height of a roll of paper, and length is the direction of the paper's grain. The straightness we often refer to as 787mm * 1092mm, and 1092mm is the grain of paper. The same size is 889mm * 1194mm, and 1194 is the grain of the paper. Generally, there are grain requirements for making cardboard boxes, color boxes, hand bags, etc.