The shrinkage temperature,chromium content in waste liquor,thickness increasing rate,tearing force,softness and leather yield were investigated by orthogonal design,the retanning,filling and fatliquoring processes of wet dyeing and finishing of cattle upper leather were designed and optimized.The results show the optimum retanning process is 6％formaldehyde retanning agent,60 min rotation time,4％chrome retanning agent,90 min rotation time.The optimum filling process is 4％of acrylic resin,6％of amino resin,8％of synthetic tanning agent and 4％of vege-table tannin extract.The optimum fatliquoring process is 6％of synthetic oil,3％of tallow oil,4％of lecithin and 3％of synthetic ester.The properties of the upper leather made by the best technology integration meet the requirements of QB/T 1873-2010.
The objective of this research is to address the issue of automated selection of the optimal stretching position for leather during the leather toggling process. By analysing a substantial number of leather profiles and the actions involved in manual stretching and leather stretching, it has been determined that selecting appropriate stretching positions and intervals is the pivotal factor in enhancing leather yield. Through orthogonal experimentation, it has been deduced that the ideal distances between the stretching points on both sides of the head and tail, as well as on both sides of the body parallel to the midrib line, are 12cm and 9cm respectively. Building upon this, the study proposes an algorithm for identifying and locating the most suitable stretching positions based on the simplified skeleton method and the intersection method of drawn circles. The algorithm employs machine vision to obtain the initial image of the leather source, followed by preprocessing to eliminate image defects and accentuated contours. Subsequently, the thinning algorithm extracts the image skeleton, and the convolution operation filters out the ridges and limbs of the leather, resulting in the simplest skeleton that determines the requisite stretching points. Building upon the determination of the necessary stretching points, the remaining contour regions of the leather are established using the circle intersection method, thus obtaining the remaining stretching points. The identified algorithm for identifying the optimal stretching points in this study holds significant importance in the research and development of automated equipment for the leather stretching plate drying process, and serves as a valuable reference for enhancing leather yield and optimising the process.
In order to improve the fragrance retention performance of fragrant leather,the wet blue was used as raw material leather,the lavender essence oil/β-cyclodextrin inclusion compound(LEO/β-CD)formed by β-cyclodex-trin(β-CD)included with lavender essence oil(LEO)was used as fragrant,and the pungent odor intensity,fra-grance concentration,fragrant comfort and the softness of the obtained fragrant leather were used as evaluation indica-tors,and the orthogonal design method was used to optimize the aromatization process of retanning,oiling,and colo-ring processes,and the fragrance retention performance of the obtained fragrant leather at different temperatures was investigated.The experiment results show that the optimized preparation process of lavender fragrant leather is as fol-lows:the addition amount of LEO/β-CD in the retanning,fatliquoring and coloring processes is 0.1％,0.5％and 0.2％,respectively.The fragrance retention performance of the obtained fragrant leather is much higher than that of ordinary fragrant leather,and it can be stored at room temperature for more than 6 months.The fragrant leather pre-pared by using β-cyclodextrin inclusion fragrance has long-lasting fragrance retention performance,which provides a new idea for the preparation of fragrant functional leather.
Low carbon economy is a major issue in the development process of Chinese leather industry.With a low carbon economy as the macro background,leather in the process of enterprise development in our country under the influence of low carbon economy policy in the face of such as pressure on energy conservation and emissions reduction is more and more big,more and more capital investment,competition between enterprises,such as the low carbon e-conomy under the background of how to improve the method of leather enterprise core competitiveness analysis,such as it is concluded that the core competitiveness of enterprises can be improved from the aspects of improving the inter-nal management mechanism,improving the independent innovation ability of enterprises,and balancing the relation-ship between internal and external industry chains.
By analyzing the surface characteristics of different parts of the last(middle saddle surface,back heel elliptic cone,front head crown surface)and their twisting changes,the formation reasons of shoe stilt were revealed.On this basis,the stilt and treatment methods of 4 different parts of the heel elliptic cone of the last,the saddle sur-face of the tarsal waist,the crown surface of the front head and the bend of the foot of the boot last were further inves-tigated.Then the warpage principles of 4 different parts of the last surface and 5 different structures of the shoe upper were summarized,which provided very important basic theory for improving the accuracy and benefit of manual warp-age and the research and development of digital warpage technology.
