Improvement of Colour Uniformity During Dyeing Operation: The Case of Dress Gloving Leather
| dc.contributor.advisor | Berhanu, Assefa (PhD) | |
| dc.contributor.advisor | Aravindhan, R. (PhD) | |
| dc.contributor.advisor | Jawahar, Malathy (Mrs.) | |
| dc.contributor.author | Wondwossen, Mamuye | |
| dc.date.accessioned | 2020-11-26T06:35:06Z | |
| dc.date.accessioned | 2023-11-28T13:37:05Z | |
| dc.date.available | 2020-11-26T06:35:06Z | |
| dc.date.available | 2023-11-28T13:37:05Z | |
| dc.date.issued | 2018-06-17 | |
| dc.description.abstract | In leather industry, the tanner produces a production lot with large number of leather samples to match a colour provided by a client. However, even when the leathers are dyed with the same colorants under well monitored conditions may show some colour non-uniformity. This is highly challenging today for leather manufacturers, especially glove producers to sort colour of leathers consistently. The present study is focused on identifying the factors of colour variation during dyeing operation and reducing colour non-uniformity by managing the factors with welldesigned dyeing recipe. Dyeing properties of the dyestuffs was investigated, by choosing two commercially available dye stuffs. Factors of colour non-uniformity are identified by conducting dye trials on possible causes of colour non-uniformity with four different well-designed dyeing recipes. When concentration of dyestuff, substance of skin or length of dyeing float are varied individually keeping others factors the same, a perceivable total colour difference (∆E*≥0.5) is observed. Controlling and monitoring of colour non-uniformity is analyzed by conducting dye trials using four different well-designed dyeing recipes viz. reverse dyeing recipe, regular dyeing recipe, the multiple stage dyeing recipe and regular dyeing recipe with dye levelling agent. The total colour difference (∆E*) values obtained using multiple stage dyeing recipe was smallest as compared to the other three recipes by varying all possible factors of colour non-uniformity individually. From these observations, multiple stage dyeing recipe was the best alternative way to manage colour non-uniformity. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/23591 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Dyeing Operation | en_US |
| dc.subject | Dress Gloving Leather | en_US |
| dc.subject | Colour Uniformity | en_US |
| dc.title | Improvement of Colour Uniformity During Dyeing Operation: The Case of Dress Gloving Leather | en_US |
| dc.type | Thesis | en_US |