Pretreatment Processes of Mohair Fibers
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- Created on Friday, 13 May 2016 16:56
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- Published on Friday, 13 May 2016 16:56.
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- Pretreatment Processes of Mohair Fibers writer Faik KeserPosted by %PM, 13% 625% 2016 17%:%May in Paint-Finish Read 2527 times
WASHING
As with wool, the first process in the processing of mohair fiber is washing. The aim is to clean the fibers as effectively as possible without matting, yellowing and destroying the natural shine of the fibers. Washing is a critical process for lint and determines the properties of the desired end product. Mohair fibers contain less impurities than wool. In general, with the washing process, an average of 15% in fibersThere is a loss of -20 mass. Mohair is generally much more sensitive to alkali than wool.
Therefore, very little or no soda should be used. Today, washings using non-ionic detergents are preferred.Mohair fibers are more exposed to weather conditions due to the open structure of the fleece on the goat, and therefore the oil in the fibers undergoes more oxidation compared to the wool fibers. This situation causes the removal of the oil in the mohair more difficult than in the wool.
For this reason, a larger amount of washing agent should be used compared to wool in order to remove 1 gram of oil from the lint during wool washing. It has been found that the fibers clean as effectively as soap without causing physical damage, but the lipase enzyme is not an effective fleece washing agent.Washing conditions for mohair are milder than wool and the temperature of the first wash tub should never exceed 50ºC and then this temperature should be lowered to 45º or 40º in the last tub.
During the washing process, the pH should also be strictly controlled and in a 3-step washing process, the pH of the first tub should be adjusted to 10.5, the pH of the second tub should be adjusted to 9.5 and the pH of the third tub should be adjusted to 8.5.
The use of the 4th and 5th wash basins is optional. Only non-alkaline-The first bath temperature can be 60º in washing with an ionic detergent. The temperature should be kept as low as possible (like 80°C) during drying after washing.
CARBONIZATION
According to the vegetable matter content, mohair fibers;
- low (1-3%)
- medium (3-6%)
- high (6% and more)
divided into 3 classes, including.
Although carbonization is applied to a very small amount (about 2%) of the mohair, this rate can reach up to 15% due to the growth of a large amount of grass and other plant materials and the presence of a high amount of seeds, especially in regions with heavy rainfall and in seasons. For example, 2% of Kap lint grown in South Africa requires carbonization. However, the amount of lint that will be carbonized in heavy rainy seasons can reach up to 12%. Vegetal residues such as velcro, twigs and other plant fragments attached to the goat's hide cause very serious problems in textile production.
It is inevitable that there will be some plant fragments, but increasing their proportion increases the amount of debris in the combing and carding process. Some plant particles cannot be removed as a result of combing and carding processes. Therefore, to completely remove cellulosic residues, carbonization is usually used, in which acids, normally sulfuric acid, are used, followed by heating, whisking and pouring off the residues. The sulfuric acid content of the mohair fibers prepared for the heating process should be lower than 6% and normally the carbonization process should be applied when the vegetable surplus amount exceeds 3%. Carbonization is an expensive process and leads to reduced fiber brightness and strength.