What is the papermaking process like?

Modern papermaking procedures can be divided into pulping, preparation, papermaking, processing and other main steps:

1. Pulping process:

Pulping is the first step in papermaking. Generally speaking, there are three ways to convert wood into pulp: mechanical pulping, chemical pulping and semi-chemical pulping.

Second, the modulation process:

The preparation of paper is another key point in papermaking, and the strength, color tone, printability and shelf life of the finished paper are directly related to it.

The common preparation process can be roughly divided into slurry dispersion; Beating; Glue addition and filling.

III. The main job of the process papermaking department is to evenly interweave and dehydrate the tissue paper, and then dry, calender, roll paper, cut, sort and package it, so the general process flow is as follows:

1. Paper screening: the prepared paper is diluted to a lower concentration, and impurities and undissociated fiber bundles are screened again with the help of screening equipment, so as to maintain the quality and protect the equipment.

2. Mesh part: make the paper flow out of the headbox on the circulating copper wire mesh or plastic mesh and evenly distribute and interweave.

3. Press part: The wet paper removed from the mesh surface is introduced between two rollers with felt cloth, and the wet paper is further dehydrated through the extrusion of the rollers and the water absorption of the felt cloth, thus making the paper more compact, improving the surface of the paper and increasing the strength.

4. Dryer: Because the moisture content of the pressed wet paper is still as high as 52%~70%, it can no longer be pressed out by mechanical force, so let the wet paper pass through the surface of many dryers filled with hot steam to dry the paper.

5. Paper roll: The paper web is rolled into a paper roll by a paper roll machine.

6. Cutting, sorting and packaging: take a plurality of paper rolls whose front faces are rolled into a cylinder, cut them into thin slices with a paper cutter, manually or mechanically sort out the damaged or stained thin slices, and finally pack every 500 sheets into a package.

The principle of papermaking:

Pulping is to dissociate plant fiber raw materials into natural pulp or bleached pulp by mechanical method, chemical method or a combination of the two. Papermaking is to combine pulp fibers suspended in water into sheets that meet various requirements through various processes.

Another important factor in papermaking is beating and beating of fibers. By using a stirring knife and high-power machinery, plant fibers are bifurcated and broken, and then paper is made with great binding force, unlike smooth silky fibers that easily slip off. In addition, the crumbs and paste produced after pulping have the functions of filling pores and bonding paper in the paper making process.

In ancient or modern manual papermaking, framed bamboo was used to screen floating fibers in pulp. Because the screening function has short and long sides, the fibers in handmade paper can be arranged freely in all directions very evenly, and there is no silk flow problem mentioned in this paper.

Then there is the modern waterless dry papermaking method, which uses air to spread and bond the paper, and its fibers are also arranged freely, without the direction of silk flow.