Elastic network structure
Provided is an elastic network structure having durability and cushioning properties suitable for furniture, bedding such as a bed, seats for vehicles, seats for shipping, etc., the network structure being lightweight and having excellent chemical resistance, excellent light resistance, soft repellency, and excellent cushioning characteristics in a low temperature environment. The elastic network structure comprises a three-dimensional random loop bonded structure obtained by forming random loops with curling treatment of a continuous linear structure having not less than 300 decitex, and by making each loop mutually contact in a molten state to weld the majority of contacted part, the continuous linear structure mainly including a low density polyethylene resin with a specific gravity of not more than 0.94 g/cm 3 .
1. An elastic network structure having an elastic recovery rate of not less than 95% measured in a test of 75% compression and decompression and a hysteresis loss from 35% to 70%, the elastic network structure comprising a three-dimensional random loop bonded structure obtained by forming random loops with curling treatment of a continuous linear structure having not less than 300 decitex, and by making each loop mutually contact in a molten state to weld majority of contacted parts, the continuous linear structure mainly including an ethylene-α-olefin copolymer resin containing ethylene and an α-olefin with a carbon number of not less than 3, the ethylene-α-olefin copolymer resin having a specific gravity of not more than 0.94.
2. The elastic network structure according to claim 1 , wherein the network structure has an apparent density of 0.005 to 0.2 g/cm 3 .
3. The elastic network structure according to claim 1 , wherein a compressive strain retention after light resistance test by a carbon arc lamp is not less than 60%.
4. The elastic network structure according to claim 1 , wherein a 25%-compression hardness at 0° C. of the network structure is not more than 150% compared with a 25%-compression hardness at 20° C.
5. The elastic network structure according to claim 1 , wherein a 50%-compression hardness at 0° C. of the network structure is not more than 150% compared with a 50%-compression hardness at 20° C.
6. The elastic network structure according to claim 1 , wherein a diameter of a random loop is not more than 50 mm.
7. The elastic network structure according to claim 1 , wherein a thickness of the network structure is not less than 3 mm.
8. The elastic network structure according to claim 2 , wherein a compressive strain retention after light resistance test by a carbon arc lamp is not less than 60%.
9. The elastic network structure according to claim 8 , wherein a 25%-compression hardness at 0° C. of the network structure is not more than 150% compared with a 25%-compression hardness at 20° C., and a 50%-compression hardness at 0° C. of the network structure is not more than 150% compared with a 50%-compression hardness at 20° C.
10. The elastic network structure according to claim 9 , wherein a diameter of a random loop is not more than 50 mm, and a thickness of the network structure is not less than 3 mm.
11. The elastic network structure according to claim 1 , wherein the ethylene-α-olefin copolymer resin has a specific gravity of not more than 0.935.
12. A cushion comprising an elastic network structure having an elastic recovery rate of not less than 95% measured in a test of 75% compression and decompression and a hysteresis loss from 35% to 70%, the elastic network structure comprising a three-dimensional random loop bonded structure obtained by forming random loops with curling treatment of a continuous linear structure having not less than 300 decitex, and by making each loop mutually contact in a molten state to weld majority of contacted parts, the continuous linear structure mainly including an ethylene-α-olefin copolymer resin containing ethylene and an α-olefin with a carbon number of not less than 3, the ethylene-α-olefin copolymer resin having a specific gravity of not more than 0.94.
13. The cushion according to claim 12 , wherein the network structure has an apparent density of 0.005 to 0.2 g/cm 3 .
14. The cushion according to claim 12 , wherein a compressive strain retention after light resistance test by a carbon arc lamp is not less than 60%.
15. The cushion according to claims 12 , wherein a 25%-compression hardness at 0° C. of the network structure is not more than 150% compared with a 25%-compression hardness at 20° C.
16. The cushion according to claim 12 , wherein a 50%-compression hardness at 0° C. of the network structure is not more than 150% compared with a 50%-compression hardness at 20° C.
17. The cushion according to claim 12 , wherein a diameter of a random loop is not more than 50 mm.
18. The cushion according to claim 12 , wherein a thickness of the network structure is not less than 3 mm.
19. The cushion according to claim 12 , wherein the ethylene-α-olefin copolymer resin has a specific gravity of not more than 0.935.