необходимо безотлагательно составить 10 предложений на тему:как изготовляется бумага

How to make paper? The paper consists of millions of fine fibers. This fiber - cellulose, a substance derived from a different plant tissue. The cellulose used in these days for the production of paper мейд mainly of wood. Once debarked logs, wood is ready for transformation into pulp - either by grinding or by treatment with chemicals. Some methods for manufacturing pulp and include milling, and chemical processing. Then this mixture is screened and washed, thereby cleaning it from dirt and chemicals. Then it can be bleached to printed or written on it signs more visible. In the next step this mixture is whipped in a special machine and mixed with water. The process of beating obtrepyvaet fiber, making them stuck together, uniform mass. To improve the paper surface, making it more suitable for writing and printing, can be added to the mass of starch, clay and other materials. Then the pulp enters the refiner where the fibers are in order. At this stage the mass consists ninety-nine percent of the water and only one percent of the cellulose fibers. Now she is ready to go to the paper machine. In this machine, the water is drained from the stck through a sieve and then the remaining water is removed using a suction pump. Vibrating sieve to help adhere the fibers together. Then wet mass is held under the round roller, pressed it into a smooth sheet. This sheet passes under a plurality of smoothing rollers which squeeze water therefrom, and make a smooth and thick paper. Thereafter, it passes through a series of heated cylinders called dryers. In this step, can be added special coating making the paper smooth and shiny. Of these machines, paper comes in large rolls. Then her trimmed by cutting the rough edges and giving the desired width of the roll.

Бумага изготовляется. и с дерева