What is the principle of papermaking?

The papermaking process can be roughly divided into two major steps:

The first step is pulping. If trees and grasses are used for papermaking, the trees and grasses should be cut up first, and then they should be steamed in a large pot until they are rotten. Then, the steamed liquid (professionally called pulp) should be put out of the pot, and then the pulp will be worn worse by the fibers in the pulp through the special equipment. Next, the pulp is treated with screening equipment, then bleached, and the pulp is washed clean.

The work here is professionally called "pulping". To sum up, it is: chopping - Cooking - grinding - Screening - bleaching - washing.

The second step is papermaking. Screen and remove the residue of the pulped pulp again (Note: the screening equipment here is not shared with the screening equipment of the pulping section). Since the pulp from the pulping workshop is relatively thick, it is necessary to dilute the pulp to about 0.8%. At this time, the treated pulp is sprayed onto the surface of the net (professionally called "forming net") through special equipment (professionally called "headbox") through the pipe. There is a vacuum box on the back of the net to absorb the water in the net all the time, thus slowly absorbing the liquid pulp into wet paper with certain strength. The wet paper is extruded by a special roller (professionally called "press roller") and finally pasted on the cylinder surface of many large iron and steel cylinders (professionally called "drying cylinder") for complete drying and rolled into large rolls.

The large roll of paper is further rolled on the rewinder to meet the customer's requirements. To sum up: screening and slag removal -- dilution -- Networking -- pressing -- drying -- coiling -- rewinding -- packaging and warehousing of finished products. During the whole pulp and paper process, chemical additives will be added at specific places, such as filter and retention aids, enhancers, sizing agents, fungicides, defoamers, cleaning agents, etc.