| Leather waste collagen fiber is obtained from the leather leftover materials mechanical dissociation, which is characterized by its larger dispersion of the length and fineness. It has high specific surface area and the tendency to fibrillation. As a result, the fibers are easy to tangle together and separate poorly. According to the characteristics of the fibers and the existing study, the article will adopt non-woven technology. Firstly, collagen fibers mixed with a certain proportion of waste leather fibers were made into nonwoven fabric by airlaid and spunlace technology, and then were reinforced further through the thermal bonding process. The experiment attempted to produce more bonding among fibers under the effect of temperature and pressure in order to improve the situation of spunlace consolidation with lower strength and achieve the purpose of increasing the materials’ strength.In this study, collagen fibers were mixed with hot melt fibers at the ratio of 80:20,70:30 and 60:40 between collagen fibers and hot melt fibers. Through the surface treatment of the chemical agents, electrostatic flocculation phenomenon of the mixed fibers during the airlaid process was significantly improved and received better net effect.This subject carried out a systematic study on the thermal bonding process of collagen fibers. In the experiment, we took three important impact factors- temperature, pressure and time as parameters and took unit breaking strength R value as the parameter to analyze the materials’ strength. Firstly, we took a single-factor test to investigate the impact which each parameter took on the tensile properties of products. And then, we proceed to the orthogonal experiment to get the optimal process parameters.The study results show that as the increase of hot rolling temperature, pressure and time, the breaking strength of the products tends to increase first and then decrease. Comparing the unit breaking strength R value of three groups in different proportions, A (80:20), B(70:30), C (60:40), group B has the maximum value followed by group C and the results of the group A is minimum.Taking the orthogonal test on group B, we analyze synthetically and get the optimal hot rolling process:hot rolling temperature 70℃, hot rolling pressure 7Mpa, hot rolling time 7s. And the affect order of the three hot rolling parameters is as follows:hot rolling temperature>hot rolling time>hot rolling pressure.The subject also tested and analyzed the tearing strength and permeability performance. We found out the influence rules that different thermal bonding process factors took on the application perfonnance of the products, providing reliable experimental basis for the products’practical application. The study results show that tearing strength of three groups A, B, C materials in different proportions will go down with the rise of the hot rolling temperature, rise first but then reduce again while hot rolling pressure is increasing. Meanwhile, with the single variable going on, the permeability performance of the materials will decrease continuously.Finally, we tested the group B material under the optimal process conditions according to the standard of textiles-nonwovens for synthetic leather. Among those results, the breaking strength reaches 80% of the pure spunlaced polyester fabric. Meanwhile, both the tearing strength and dry-hot shrinkage meet the standard’s requirement, which lays a good foundation for broader application of this product. |
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