Chemical and machinery pulping process using complete white mulberry branch as raw material

Abstract

This invention discloses a pulping process with mulberry bough as raw material, which comprises the following steps: slicing, steaming before scouring, scouring, steaming after scouring, first squeeze, second squeeze, steeping, reaction, post-treatment, and these steps are sequential. The invention improves percent of pass of slicing mulberry bough and availability ratio of pulp in the core, and has good dust collection efficiency. With mixing pulping of mulberry bough, the bore rod with short fibre and large content can be used fully, and the finished pulp can be used in top grade paper. With fully using resource is, the process settles said technical matters, and it is suit for use in commercial manufacture.

Description

technical field [0001] The invention relates to a papermaking pulping process, in particular to a chemical mechanical pulping process using mulberry branches as raw materials. Background technique [0002] With the technological progress of the paper industry and the increase of paper consumption, the raw material structure of papermaking is also constantly evolving. As one of China's "Four Great Inventions", papermaking was born in the Eastern Han Dynasty in the Zhenglun era. At that time, the raw materials for papermaking were rags and fishing nets mainly made of hemp; in the Tang and Song Dynasties, papermaking began to use hemp, bark, Raw materials such as straw: People later found that wood is better than other raw materials because of its fiber shape, and it is easy to produce various high-quality products, with high production efficiency, easy pollution control, dense volume, easy transportation, and storage. However, in my country, due to the lack of understanding of ...

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Problems solved by technology

Many years ago, it was recorded in our country that the bast bark of mulberry branches was used to produce rice paper, and the production of natural color wrapping paper with the core rods of mulberry branches has been the result of our country's research in recent years. However, there is no report of using mulberry branches to mix pulp

[0004] China Patent Office discloses a kind of " mulberry bar, tobacco rod cold alkali method pulping and papermaking process " with publication number CN107092A. Pulping and papermaking. This method can be used to manufacture cigarette paper, imitation rice paper, high-grade sacrificial paper, oil-proof and waterproof base paper (food packaging paper), etc. This process is a typical chemical pulping process, specifically a cold alkali From the perspective of its technical content, although the phloem and core rod of mulberry branches are sliced ​​and mixed for pulping, there is no technical hint for making high-grade paper such as newsprint. The reason is that mulberry strips Cold soda pulping only adopts a large amount of lignin removal pulping method, without bleaching and high-consistency refining process, and the whiteness and fiber characteristics cannot meet the requirements of high-grade paper.

[0014] (1) Due to the large difference in the chemical composition of the phloem and core rods of mulberry branches, it is difficult to achieve sufficient alkalization of the phloem and core rods at the same time during the mixing pulping process, especially during the dipping process, and it is not easy to find a suitable one. Impregnation liquid and impregnation process conditions can easily lead to insufficient fiber swelling and affect the pulping effect;

[0015] (1) Since the fiber morphology of the phloem and the core rod of mulberry branches is also very different, there is a large difference in fiber length. In the process of mixing and pulping, if the fiber is too long, it is easy to accumulate during papermaking. If the fiber is too short, the quality of the paper made The strength is not enough, therefore, in the pulping process, it must be solved that the pulp produced meets the requirements of producing high-grade paper, but it has not been solved so far;

[0016] Just because of the above-mentioned difficulties, using mulberry branches as the original rod for pulping, the prior art can only separate the bast and core rods for pulping respectively, but the separation process of bast and core rods is difficult, and it is generally required to separate the mulberry branches before separation. Fully soaked, and the soaking time must be long, the water content of mulberry branches should be high, and manual separation is adopted, which cannot meet the needs of industrialized large-scale production at all. Therefore, the method of making pulp separately with bast and core rods is generally limited to manual workshops. There is a long history of using bast to make chemical pulp to make high-grade paper, such as rice paper, mirror paper, filter paper, etc. Due to the limitation of raw materials and pulping requirements, the production scale is very small. If only bast is used as pulping raw material, due to its The proportion of the whole mulberry branches is small. If all the bast is used for pulping and papermaking, the loss of other parts will be large and the cost will be high. How to make full use of the core rod to make high-grade paper has become an urgent and unsolved technical problem. ;

[0017] Second, the dust on the surface of the phloem is difficult to remove:

But this kind of pulping process has the disadvantages of low pulp yield and high production cost, and cannot be used for large-scale production requirements, and the economy is poor

[0019] The chemical pulping method is used for the whole rod, because there is no dust problem on the core rod, if the same chemical liquid is used, it will appear: or the core rod fiber is seriously damaged due to excessive chemical liquid, and the yield and strength of the pulp are too low: or Insufficient amount of liquid causes dust to be unable to be eradicated, there are many bast fiber bundles, and the quality of pulp is very poor, so it is difficult to accurately control the amount of liquid medicine

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