What is the principle of papermaking?

The papermaking process is roughly divided into two main steps:

The first step is pulping. If paper is made from trees and grass, the trees and grass should be chopped first, then boiled in a large pot until it is rotten, and then the steamed liquid (professionally called pulp) is released from the pot, and then the pulp flows through special equipment, which is even worse by the fibers in the pulp. Next, the pulp is treated with screening equipment, then bleached and cleaned.

The job here is called "pulping" professionally. To sum up: chopping-cooking-grinding-screening-bleaching-washing.

The second step is to make paper. The pulped slurry is screened again to remove residues (note: the screening equipment here is not used with the screening equipment in the pulping section). Because the pulp from the pulping workshop is thick, it is necessary to dilute the pulp here to a concentration of about 0.8%. At this time, the treated pulp is sprayed on the surface of the net (professionally called "headbox") through the pipeline, and the vacuum box at the back of the net always absorbs the moisture in the net, thus slowly sucking the liquid pulp into the wet paper with a certain strength. The wet paper is pressed by a special roller (professionally called "press roller"), and finally sticks to the surface of many large steel cylinders (professionally called "dryer"), so that it is completely dried and rolled into large rolls.

The large roll paper is further rolled into finished paper meeting the customer's requirements on the rewinder. To sum up, screening deslagging-dilution-online-squeezing-drying-coiling-rewinding-finished product packaging and warehousing. In the whole pulping and papermaking process, chemical additives, such as retention AIDS, reinforcing agents, sizing agents, fungicides, defoamers, cleaning agents, etc. , which will be added at a specific location.