| 摘要 |
PROBLEM TO BE SOLVED: To provide a cushioning material having excellent biodegradability, light weight and excellent rigidity. SOLUTION: The fiber cushioning material includes: a fiber structure including a biodegradable fiber A of a core-sheath type conjugate fiber, and having the sheath part and the core part both of which are composed of biodegradable thermoplastic resins regulated so that the melting temperature of the biodegradable thermoplastic resin constituting the core part may be higher than that of the biodegradable thermoplastic resin constituting the sheath part, and a biodegradable fiber B constituted of a biodegradable thermoplastic resin having a melting temperature at least 20°C higher than that of the biodegradable thermoplastic resin constituting the sheath part of the biodegradable fiber A, as main constituent fibers. The fiber cushioning material satisfies the following requirements: (1) at least a part of intersection points of the biodegradable fiber A and a constituent fiber contacting therewith is fused; and (2) the constituent fiber is oriented in the thickness direction of the fiber structure. COPYRIGHT: (C)2009,JPO&INPIT
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