Fibrous Network Structure Having Excellent Compression Durability
The present invention provides a network structure having excellent repeated compression durability, the network structure having a low repeated compression residual strain and a high hardness retention after repeated compression. A network structure comprising a three-dimensional random loop bonded structure obtained by forming random loops with curling treatment of a continuous linear structure including a polyester-based thermoplastic elastomer and having a fineness of not less than 100 dtex and not more than 60000 dtex, and by making each loop mutually contact in a molten state, wherein the network structure has an apparent density of 0.005 g/cm 3 to 0.20 g/cm 3 , a 50%-constant displacement repeated compression residual strain of not more than 15%, and a 50%-compression hardness retention of not less than 85% after 50%-constant displacement repeated compression.
1 . A network structure comprising a three-dimensional random loop bonded structure obtained by forming random loops with curling treatment of a continuous linear structure including a polyester-based thermoplastic elastomer and having a fineness of not less than 100 dtex and not more than 60000 dtex, and by making each loop mutually contact in a molten state, wherein the network structure has an apparent density of 0.005 g/cm 3 to 0.20 g/cm 3 , a 50%-constant displacement repeated compression residual strain of not more than 15%, and a 50%-compression hardness retention of not less than 85% after 50%-constant displacement repeated compression.
2 . The network structure according to claim 1 , wherein the network structure has a 25%-compression hardness retention of not less than 85% after 50%-constant displacement repeated compression.
3 . The network structure according to claim 1 , wherein the network structure has a thickness of not less than 10 mm and not more than 300 mm.
4 . The network structure according to claim 1 , wherein the cross section of the continuous linear structure that forms the network structure is a hollow cross section and/or a modified cross section.
5 . The network structure according to claim 1 , wherein the network structure has a hysteresis loss of not more than 28%.
6 . The network structure according to claim 1 , wherein the network structure has a number of bonding points per unit weight of 60/g to 500/g.
7 . The network structure according to claim 1 , wherein the 50%-compression hardness retention is not less than 90% after 50%-constant displacement repeated compression.