Paper and cardboard found very widely used and play an important role in the modern world. The ancient Egyptians over three thousand years ago, used similar to the properties of a material made from fibers of papyrus. More than half produced paper accounts for printed products, while the other half is used in the production of container. In many areas of the paper is irreplaceable and it is preferred as a packaging material. Foundation board and paper is cellulose, which is made from wood. By mechanical effects are short fibers of low quality, but by chemical – high-quality long fiber pulp. From this product, called the pulp, after drying, are different types of paper.
The main semi-finished product in the production of a cellulose, wood pulp and waste paper. Wrapping and newsprint produced from wood Half-rag made from scraps of linen or cotton fabrics that are cleaned, crushed and converted into fibers. Disposal of waste in establishments for the manufacture of paper. For produce various kinds of paper, half-mixed with each other, for example wood pulp is mixed with or added to a rag pulp. The quality of paper and board based on various indicators. By the same author: NYC Mayor. Main characteristic of the paper material is the mass of 1 m 2, in grams, according to which the distinction: 1. paper, weighing from 5 to 200 g/m3.
On the content of the paper pulp mixture classified: superfine, fine, polutonkaya, plain and cardboard. Corrugated cardboard is produced from cellulose by adding it to the secondary raw materials, dyes and other materials. 3. paperboard, weighing 400 to 1200 g/m3. This board is designed for the manufacture of boxes, with Designed for full-color print quality and used in the production of postcards, brochures and folders. It has a low rigidity, but has a high whiteness and qualitative composition. 2. Packing. It has high hardness colors. The main advantages of cardboard and paper are their simplicity and use as packaging for various products. Besides paper and cardboard can be recycled, which saves material resources. Made of recycled building materials that are environmentally friendly. The disadvantages of cardboard and paper should be attributed a higher value compared to some types of plastic, high moisture permeability, poor resistance to mechanical and chemical influences.