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Most of the time ,after using the general handkerchief paper ,we could find that the area used actually is a small area in the center of the handkerchief and the area around is wasted . So we change the square paper into round paper. This way can reduce raw material and ensure adequate area for holding.
Zhejiang University of Technology
Hanzhou, China
Zhejiang University of Technology
Hanzhou, China
Yuanshan Ying
Zhenzhen Yu