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A systematic study of a modified drafting system based on the ring spinning frame, which is called the SDS (soft drafting system), is reported in this article to raise yarn quality. Two parts of an experiment were conducted to investigate differences between the conventional and modified drafting systems by spinning three kinds of yarns (in part I) and the effects of process parameters (block gauge, pressure on the front rollers and break draft) on the SDS by using response surface methodology (RSM) to spin 18.2 tex cotton yarn (in part II). The results show that the SDS can significantly improve yarn evenness and reduce yarn imperfections of thick places by +35% and +50%, respectively, and neps by +140% per km. In addition, it is noted that the three parameters are all statistically significant for the SDS to spin yarns, while interactions between them are not. More importantly, RSM predicted a minimum CVm% of 13.95% under the optimum conditions of 1.75 mm, 190 N and 1.21 for the block gauge, pressure on the front rollers and break draft, respectively, which is very close to the conditions of the practical spinning test.

Innovation strategies for the promotion of solid waste recycling technologies include not only new technologies for resource utilization of solid waste but also sustainable business models to support the adoption of these technologies. This study presents how to incorporate the determinant factors affecting technology promotion and business strategy into a sustainable business model for the promotion of solid waste recycling technologies. A systematic literature review summarizes the determinant factors affecting the aforementioned promotion, including market-, policy-, company-, and technology-related factors. Combined with the theoretical background of the sustainable business model, this study analyzes that for the promotion of solid waste recycling technologies from value dimensions (value proposition, value creation & delivery, and value capture) and sustainability dimensions (economic, social, and environmental). We confirm the importance of incorporating determinant factors into the sustainable business model from the analysis of the Daye Non-Ferrous Metal Recycling Park. Our case study proposes that innovation of the sustainable business model needs to drive changes in business strategy. To promote the aforementioned technologies, we propose an Internet-based technology service platform as the core strategy of the sustainable business model. As the private sector, technology companies can make full use of technological innovation, public policies, and the market environment to achieve and develop sustained competitive advantages through an Internet-based platform and to effectively enhance the promotion of solid waste recycling technologies and help achieve sustainable development.