Taking the method of making bamboo paper recorded in the ancient China classic "Tiangong Kaiwu" as an example, this paper introduces it. In ancient times, the steps of bamboo papermaking were as follows: 1. Chop bamboo, float it in the pond, chop it, put it in the pond, soak it for more than 100 days, decompose it with natural microorganisms, and wash off the green skin of bamboo.
2. Cook the bamboo obtained above and put it in a bucket and cook it with lime for eight days and eight nights.
3. Take the treated bamboo out of the mortar, put it in the mortar and beat it with the mortar until the bamboo is smashed and looks like mud.
4. Throw the cloth into the curtain. Pour the mashed bamboo material into the sink and swing the bamboo material in the water with a bamboo curtain. The bamboo material becomes a thin layer and sticks to the bamboo curtain, and the remaining water flows down the water tank from the four sides of the bamboo curtain.
5. Cover the curtain to press the paper, and then repeat the curtain to make the wet paper fall on the board, thus making a piece of paper. In this way, the steps of placing materials and covering curtains are repeated, so that thousands of wet papers are stacked, and the boards are added to squeeze out most of the water.
6. Bake the wet paper over the fire. The equipment for baking paper is to build an alley with adobe bricks and make a fire in the alley. After the temperature of adobe brick rises, wet paper is pasted one by one and baked. After drying, the paper is obtained by uncovering the cover.
Edit modern papermaking methods in this paragraph.
Modern papermaking procedures can be divided into pulping, preparation, papermaking, processing and other major steps.
1. 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.
2. The modulation of paper materials in the modulation process 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 brewing process can be roughly divided into the following three steps: a. beating B. beating C. adding glue and filling.
3. The main work of the papermaking department in the papermaking process is to evenly interweave and dehydrate the tissue paper, and then dry, calender, roll paper, cut, sort and package, so the general process is as follows:
A screening of paper: the prepared paper is diluted to a lower concentration, and impurities and undissociated fiber bundles are screened again with the aid of screening equipment, so as to maintain the quality and protect the equipment.
B, the wire part makes the paper material flow out of the headbox on the circulating copper wire net or plastic net and evenly distribute and interweave.
C, the press department introduces the wet paper with the net surface removed between two rollers with felt cloth attached, and further dehydrates the wet paper through the extrusion of the rollers and the water absorption of the felt cloth, so that the paper is more compact, thereby improving the paper surface and increasing the strength.
D. Calendering Because the moisture content of the extruded wet paper is still as high as 52-70%, it can no longer be removed by mechanical force, so the wet paper is allowed to pass through the surface of many cylinders with hot steam inside to dry the paper.
E. Because the water content of the extruded wet paper is still as high as 52-70%, mechanical force can no longer be used to remove water, so the wet paper is allowed to pass through the surface of many cylinders with hot steam inside to dry the paper.
G. Cutting, sorting and packaging: take a plurality of rolls of paper whose front faces have been rolled into a tube shape, cut them into thin slices with a paper cutter, then manually or mechanically sort out the damaged or defiled thin slices, and finally pack every 500 sheets into a package (usually called a ream).