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In order to promote the recycle of fiber products, it is necessary to expand the application of recovered fibers. In the present study, the forming method of spherical fiber assembly using recovered fibers was devised; its compatibility as pillow fillers was evaluated as well. By revealing the relationship between structure and compression property of the obtained spherical fiber assembly, it was found that the compression property can be controlled by changing the mixture ratio of core-sheath conjugate fiber, the density of fiber assembly, and the fiber composition. Consequently, it was shown that by using the spherical fiber assembly as pillow fillers, it was possible to make pillows with controlled sinking ratio and body pressure value, indicating that the spherical fiber assembly had sufficient physical properties required for application to pillow fillers.

Compression Property and Application to Pillow Fillers of Spherical Fiber Assembly Using Recovered Fibers