The Technology Of Split Nubuck Sofa Leather

In the available technologies, most are designed to manufacture upper leatherfrom cattle leather. Meanwhile, the major products in present market are cattle graingarment leather, shoe upper leather, sofa leather, etc. Although the research on splitleather has developed rapidly during the recent years, it is mostly limited in correctedleather and glove leather, even suede garment leather and transfer coating leather onlybelong to low range products. At the present time, the research on split nubuck sofaleather is completely new, especially the research on the cleaning technology of it. Thesplit leather has its own particularity so that it needs to be fill with massive chemicalmaterials during the production process. The manufacture of split nubuck sofa leatherfrom wet blue has its own limitations and meanwhile it is relatively limited in thechoice of materials for cleaning technology. Therefore, there is great difficulty todevelop split cattle sofa leather with lower costs.According to the characteristics of split leather from cattle hides, this thesis hasresearched and developed the technology of split nubuck sofa leather through plenty ofexperiments. By means of homogenization treatment to wet blue, the homogeneousdegree of it is raised, which lays a foundation for the following retanning and filling,dyeing and fat-liquoring technologies. Through selections and compatibility ofretanning agents, fat-liquoring agents and dyes as well as the contrast experimentsamong retanning, dyeing and fat-liquoring technologies, the author finally choses theretanning agents, fat-liquoring agents and dyes which have better cleaning, fillingproperties and can combine with leathers well. At the same time, these agents and dyeshave fewer influence on the waterproofing and antifouling properties of the resultantleathers. What’s more, the napping property of crust leather is really good and thevillus are delicate, homogeneous and tiny without colored spot and color difference.With methods of wet model, buffing technology and dry treatment line, we canproduce sofa leather which has tiny nap, soft handle, full temper, good constancy andlow percentage elongation. As a result, this kind of leather can come up to the idealizedstandards of furniture leather.It is the first time in China to produce cattle split nubuck sofa leather similar toupper leather by using split leather. The split nubuck sofa leather produced inexperiment has the characteristics of intensive true leather hands and comfortablehandle,etc. The successful research on this kind of leather has important significance in raising product grade and market competition, enlarging exportation and increasingenterprises’ economic benefit. Putting it into production can provides China’sleather-making enterprises reliably technical support and guarantee to the upgrade andupdate of split leather products, which can raise the technical content of products,increase enterprise’s economic efficiency and enhance the capacity of earning foreignexchanges. Applying cleaning technology to produce split nubuck sofa leather meetswith the requirement of market development. Additionally, this technology canincrease the economic added value of split leather by providing reliable technicalsupport and guarantee to the update and upgrade of split leather product. This projectpossesses significantly economic, social and environmental benefits and goodprospects.By the way of cleaning technology illustrated in this thesis, leather-makingenterprises can reduce tanning pollution, which has brilliant significance to achieveclean production of leather-making industry and sustainable development.