Network structure having excellent compression durability
The present invention provides a network structure having excellent repeated compression durability, a low repeated compression residual strain and a high hardness retention after repeated compression. A network structure made of a three-dimensional random loop bonded structure obtained by forming random loops with curling treatment of a continuous linear structure including at least one thermoplastic elastic resin selected from the group consisting of a polyolefin-based thermoplastic elastomer, an ethylene-vinyl acetate copolymer, a polyurethane-based thermoplastic elastomer and a polyamide-based thermoplastic elastomer, the continuous linear structure 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 after 50%-constant displacement repeated compression of not less than 85%.
1. A network structure made of a three-dimensional random loop bonded structure obtained by forming random loops with curling treatment of a continuous linear structure including at least one thermoplastic elastic resin selected from the group consisting of a polyolefin-based thermoplastic elastomer, an ethylene-vinyl acetate copolymer, a polyurethane-based thermoplastic elastomer and a polyamide-based thermoplastic elastomer, the continuous linear structure 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 after 50%-constant displacement repeated compression of not less than 85%.
2. The network structure according to claim 1 , wherein the hysteresis loss is not more than 35%.
3. The network structure according to claim 1 , wherein the three-dimensional random loop bonded structure includes a polyolefin-based thermoplastic elastomer, and the 25%-compression hardness retention after 50%-constant displacement repeated compression is not less than 80%.
4. The network structure according to claim 1 , wherein the three-dimensional random loop bonded structure includes an ethylene-vinyl acetate copolymer, and the 25%-compression hardness retention after 50%-constant displacement repeated compression is not less than 65%.
5. The network structure according to claim 1 , wherein the three-dimensional random loop bonded structure includes a polyurethane-based thermoplastic elastomer or a polyamide-based thermoplastic elastomer, and the 25%-compression hardness retention after 50%-constant displacement repeated compression is not less than 75%.
6. The network structure according to claim 1 , wherein the thickness of the network structure is not less than 10 mm and not more than 300 mm.
7. The network structure according to claim 1 , wherein the shape of the cross section of the continuous linear structure that forms the network structure is a hollow cross section and/or a modified cross section.