General printing paper production is divided into two basic processes of pulping and paper making, pulping is the use of mechanical methods, chemical methods or a combination of the two methods to dissociate plant fiber raw materials into bleached pulp or bleached pulp. Papermaking is the suspension of pulp fibers in water, after a variety of processing combined to meet the requirements of the paper.
Paper mills generally need to store enough raw materials for 4 to 6 months to allow the raw materials to undergo natural fermentation during storage, in order to facilitate pulping while ensuring the continuous production of the mills. The preparation of the reeds, wheat straw and wood and other raw materials cut into pieces (for the production of chemical pulp) or broken wood (for the production of groundwood pulp), and then put the small pieces of raw materials into the digester plus chemical liquid, steam cooking , The raw materials boiled pulp, or broken wood sent to the mill ground into pulp, but also after a certain degree of cooking and then ground into pulp. Then, the pulp is washed with plenty of water and removed from the chips, knots, rocks and sand in the pulp by screening and purifying. According to the requirements of the paper type, the bleach is used to bleach the pulp to the required whiteness, followed by the beating equipment for beating. And then add in the pulp paper to improve the performance of the filler, rubber, sizing agent and other accessories, and again for purification and screening, and finally sent to the paper machine through the Department of network water, squeezing dehydration, dryer drying, calender roll Take, and cut rewinder or cut to produce web and flat paper. If the production of coated paper to be produced, you need to dry the middle or after the production into a roll of paper coated by processing.
In addition to the above basic processes, auxiliary processes such as preparation of cooking liquor, preparation of bleaching liquor, brewing of rubber compounds, cooking waste liquor and recovery of chemicals and heat in exhaust gas are also included.