The main use of cardboard is the manufacture of various packages. It has a small mass and has good strength. It always retains its shape, which allows you to make it non -standard in the form of packaging.
The hero of the article is represented by several types that have a similar structure. Basically, it has four layers:
The 1st is called coated. It is the upper surface of the material.
2nd – upper. It is created from cellulose (maybe bleached or not), wood mass or waste paper.
The 3rd is a filler. In all cardboard, the thickness of this layer is the greatest. The material for such a layer is substances of low quality and low price. The list of such materials includes the mass of wood, cellulose unpretentious and many different production waste.
4th is the lowest layer. To create it, manufacturers take the highest quality cellulose. They use either bleached material or not.
The cardboard, in the structure of which there is only cellulose, known as cellulose. When the basis of cardboard is made from the waste paper, it is called the waste. In some materials, manufacturers use cellulose with very high strength. Thanks to this, the product becomes more rigid, durable and better resists moisture. It is known under the name as “Craft Carton” and is a representative of purely cellulose species that are part of the “high-quality” group.
As a rule, the structure of purely pulp cardboard is represented by several layers of challenge made of good cellulose upper and lower layers and filler, for the creation of which they take the cellulos of mechanical .