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Types of fluting
Corrugated paperboard can be further subdivided according to the size of the fluting on the core paper, that is, its height and the number of fluting per unit length. Core paper fluting
There are four types, the table below shows the paperboard produced by Mitsubishi and Langston fluting machines.
Cartons made of thicker "A" fluting have better top and bottom compressive strength than "B" and "C", but compared with "A" and "B" fluting, the thinner "B" fluting has better resistance to upward pressure. "A" and "C" fluting are used in the manufacture of cartons that are under pressure from the bottom and the packaging needs cushioning. "B" fluting is suitable for the manufacture of cartons where capacity and space are more important, and stacking strength is less important. "E" fluting has the highest compressive resistance, but its shock absorption ability is slightly worse. It is mainly used in offset (color printing) corrugated boxes that carry heavy objects.
Core paper materials
The larger the fluting diameter of the corrugated paperboard, the stronger its rigidity. The toughness of the paperboard comes from the core paper layer, and no thick and hard filler is needed, which can reduce the weight and cost of the paperboard. The core paper can be made of semi-chemical pulp (this pulp can provide the best paper strength) and recycled paper. The latter is used by many manufacturers because of its low cost. Although the paper strength is not as good as the former, it can be improved by adding starch by the paper mill.
The grooves occupy a certain space in the corrugated paper, and its role is also very important. It can withstand flat pressure, lateral pressure and other irregular pressures.
Kraft Cards
The main function of Kraft Cards is to form the inner and outer layers of corrugated paperboard. Its function can be structural or decorative. Each layer of Kraft Cards provides a variety of characteristics for the paperboard, and these characteristics can be expanded through processing procedures such as bonding and waxing.