?The challenge An increasing demand for softness Paper is an essential element of our modern lives, while tissue is a kind of paper which has the most contact and closest connection with us. With the development of science and technology, people's quality of life continues to improve, leading to increasing demand for tissues, particularly in the softness which determines the feeling of skin touch as a primary requirement for medium- and high-end tissues. The improvement of tissue softness is enabled by selection of proper pulp, improvement of beating process or addition of chemical agents during papermaking. Among these methods, addition of chemical agents is the most common way to improve the softness of tissues due to its low investment and ease of operation. In the past, chemicals used

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