Ramee degumming process

Abstract

The invention relates to a degumming technology for ramie, comprising unpacking and untying braches, loading cage, boiling, softening, bleaching and washing by acid, supplying oil, deoiling and drying. The boiling process is that the original fiber is put into the mixed solution, of which the weight is nine to twelve times of the weight of original fiber; the pressure is maintained in 0.1-0.2MPa and the maintaining time is for 1-1.5 hours. The mixed solution comprises sodium hydroxide, oxidant, oxalate and scouring agent. Thereinto, the content of sodium hydroxide is 5-8g / l, the content of oxidant is 5-10g / l, the content of oxalate is 3-8g / l and the content of scouring agent is 3-5g / l. By adopting the degumming technology for ramie, the scouring time for ramie is decreased, the manufacturing efficiency is improved, the circumstance pollution is decreased and the quality of ramie after degumming is improved.

Description

technical field [0001] The invention relates to a degumming technology of ramie. Background technique [0002] Ramie is one of important textile raw materials, and it must be processed through degumming as textile raw material, to remove the ramie glue (comprising hemicellulose, pectin, woody, fat, waxy and other carbohydrates) glued together with ramie cellulose. The ramie degumming process is generally unpacking and unbundling—raw hemp pickling—caging—scouring—coiling hemp—bleaching and pickling—oiling—deoiling—drying. The scouring process is the central link in the ramie degumming process. After the raw ramie bast is prepared before scouring, it is put into a boiling pot according to a certain capacity and form, and boiled under a certain concentration, temperature and steam pressure. Scouring in the scouring solution, so that the non-cellulose substances undergo complex chemical reactions such as dissolution, cracking, saponification, and emulsification during the scour...

AI Technical Summary

Problems solved by technology

[0006] 2. The operation is complicated, and it is necessary to continuously discharge waste, water, wash, alkali, and boost the pressure, and the labor intensity of the workers is high.

[0007] 3. Scouring a pot of ramie wastewater amounted to 25 tons, the alkali content reached 9 grams per liter, the color was yellowish black, and the pH value reached 14; because the degumming aid containing sodium tripolyphosphate was used in the second scouring , so the phosphorus content in the scouring wastewater is high, and the treatment is very difficult, causing great pollution to the environment, and the cost is high

[0008] 4. Hemicellulose is completely decomposed in the process of alkali boiling, and the concentration of alkali in the alkali boiling solution is 15 grams per liter at the same time, a small amount of cellulose dissolves, and the production rate is low, only about 60%.

[0009] 5. After scouring, ramie contains more lignin, which makes spinning difficult, and other measures are still needed to solve it

[0010] 6. It is easy to produce uneven scouring and occurrence of raw hemp, which requires high technical requirements for cage loading and scouring operations

[0011] 7. The ramie hemp handle has been washed for many times, so the hemp handle is messed up, so there are more messy hemp, which affects the follow-up process