Can ceramics be made in other colors besides white?
2022 03/07
Resin and fat generally contain less raw materials, less than 1%, but they contain more in pine wood. They are sticky and easy to bond into agglomerates, such as sticking on copper meshes and pressing rollers, causing copying. Paper is difficult, and transparent resin dots are formed on the paper, reducing the quality of the paper. They are easy to react with alkali to form soap, but dissolve in water, so pine wood with more resin is generally pulped by alkali method to reduce their harm. Fat is generally not harmful and can also be dissolved by saponification. Starch, Ceramic Tubes pectin Starch is the storage material in the cell cavity, and the content is not much. It is easily soluble in hot water and has no effect on pulping and papermaking. Generally, there is not much Ceramic Tubes pectin in the raw materials, and they are easily decomposed and dissolved by dilute lye. It exists in plants in the form of pectate and is considered a source of ash in plants. The bast fiber cell medium such as flax is mainly pectin, which can be degummed with only a small amount of alkali cooking. Tannins and pigments are less harmful in general raw materials, and they are easily extracted by hot water. However, if the content is large, try to extract it in advance, otherwise the color of the pulp will become darker and not easy to bleach. Ash is the inorganic salts in plant fiber raw materials, mainly salts of potassium, sodium, calcium, magnesium, sulfur, phosphorus and silicon. The ash content in wood is between 0.2 and 1.0%, and the ash content in grass materials is slightly higher. General paper has no special requirements for the ash content in the raw material. However, in the production of electrical insulating paper, ash must be removed to meet certain quality requirements. Among the grass raw materials, especially the rice straw has a high ash content, and the content of Ceramic Tubes SiO2 (silicon dioxide) in the ash content is relatively high, which causes the difficulty of alkali recovery. It is an open problem to reduce or eliminate the interference of silicon in alkali recovery. Compared with the previous generation, the paper of the Jin and Jin Dynasties has made obvious progress, with improved whiteness, smoother surface, tighter structure, thin paper and obvious curtain lines. The progress of papermaking and the improvement of the quality of paper in the Jin Dynasty can be seen from the poems of literati chant paper at that time. For example, Jin Fu Xian wrote in "Paper Fu": "It is a thing, it is beautiful and precious. It is cheap and clean, and the body is clean. It contains Zhang Yunzao, and it is very polite. Take the disadvantages of others and think of yourself. New. If you hold it, you will feel comfortable, and if you leave it, you will roll it. It can be bent and stretched, and it can show the nether energy." This means that hemp paper is made of rags, but it is white and ink, and it is of high quality and low price. After writing a book, it can be rolled up. If the writing material was still used in the Han Dynasty and the silk slips were used together, and paper as a new material was not enough to completely replace the silk slips, then this situation has fundamentally changed in the Jin Dynasty. Because a large amount of white, smooth and square paper can be produced, people no longer need to use expensive silk and cumbersome slips, and gradually get used to writing on paper, and finally eliminate slips. The rulers of the Eastern Jin Dynasty have clearly ordered the use of paper as the official writing material.