| 摘要 |
A sheet material, such as a needle-punched or tufted fabric, is prepared employing gas-expandable polymeric fibers, such as a polypropylene resin containing an undecomposed blowing agent, and, thereafter, expanding the diameter of the polymeric fibers by heating the fibers to form cellular polymeric fibers, the expansion locking such cellular fibers into the sheet material. The gas-expandable polymeric fibers may be employed either in the backing sheet or as the face fabric.
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