What is the manufacturing process of paper?

The manufacturing process of paper

1, cut down the tree to make materials, cut into appropriate lengths, peel off the bark.

2, cut into pieces, cut into thin slices, the thin slices will be centralized, transported to the paper mill.

3, to make pulp with medicated water and steam, rinse with medicated water, remove impurities, bleach the pulp.

4, add potion to the pulp , drain the water with a net and put it on the felt to absorb the water .

5, high temperature drying moisture, calendering machine to do calendering treatment, made of paper rolls.

The production of printing paper is divided into two basic processes: pulping and papermaking.

1, pulping is the use of mechanical methods, chemical methods or a combination of both methods to dissociate plant fiber raw materials into natural pulp or bleached pulp.

2, papermaking is suspended in water pulp fibers, after a variety of processing combined into a variety of requirements of the paper.

Paper mills generally need to store enough raw materials for 4 to 6 months, so that the raw materials in storage through natural fermentation, in order to facilitate pulping, while ensuring continuous production of paper mills. By the preparation section of the reeds, wheat grass and wood and other raw materials cut into material pieces (for the production of chemical pulp) or wood broken (for the production of grinding pulp),

and then small pieces of raw materials into the cooking device with chemical liquid, steam cooking, the raw materials into pulp, or or wood broken to the mill grinding machine into pulp,, can also be a certain degree of cooking and then grinding into pulp.

The pulp is then washed with large quantities of water,

and the coarse flakes, knots, stones and sand in the pulp are removed by screening and purification.

According to the requirements of the paper grade, the pulp is bleached to the required whiteness with bleaching agent, and then pulped with pulping equipment.

Finally sent to the paper machine after the net part of the water filtration, press dehydration, drying, and then in the pulp to improve the paper properties of the filler, glue, sizing agent and other various auxiliary materials,

And once again for purification and sieve cylinder drying, calendering and winding,

And slitting rewinding or cutting production of rolls and flat boards of paper.

If the production to produce coated printing paper, it is necessary to dry the middle or the production of rolls of paper after the coating process and realize.

In addition to the above basic process, but also includes some auxiliary processes, such as the preparation of cooking liquid, bleach preparation, rubber boiling and cooking waste liquid and exhaust gas in the chemicals and heat recovery.

Reference:

Paper-Baidu Encyclopedia