Net-like structure

Abstract

A net-like structure has a three-dimensional random loop bonded structure constituted of a thermoplastic elastomer continuous linear body having a fiber size of greater than or equal to 0.1 mm and less than or equal to 3.0 mm. The net-like structure has, in the thickness direction, a solid-section fiber main region mainly including solid-section fibers, a hollow-section fiber main region mainly including hollow-section fibers, and a mixed region including solid-section fibers and hollow-section fibers in a mixed state, located between the solid-section fiber main region and the hollow-section fiber main region. Both solid-section fiber main region-side residual strain of the net-like structure and hollow-section fiber main region-side residual strain of the net-like structure are less than or equal to 20%, and the difference between the solid-section fiber main region-side residual strain and the hollow-section fiber main region-side residual strain is less than or equal to 10 points.

1 . A net-like structure having a three-dimensional random loop bonded structure constituted of a thermoplastic elastomer continuous linear body that is either a polyester-based thermoplastic elastomer continuous linear body or a polyolefin-based thermoplastic elastomer continuous linear body having a fiber size of greater than or equal to 0.1 mm and less than or equal to 3.0 mm,
 wherein   the net-like structure has, in a thickness direction of said net-like structure, a solid-section fiber main region mainly including fibers having a solid cross section, a hollow-section fiber main region mainly including fibers having a hollow cross section, and a mixed region including fibers having a solid cross section and fibers having a hollow cross section in a mixed state, located between said solid-section fiber main region and said hollow-section fiber main region,   both solid-section fiber main region-side residual strain after 750 N constant load repeated compression at pressurization from the side of said solid-section fiber main region of said net-like structure and hollow-section fiber main region-side residual strain after 750 N constant load repeated compression at pressurization from the side of said hollow-section fiber main region of said net-like structure are less than or equal to 20%, and   a difference between said solid-section fiber main region-side residual strain and said hollow-section fiber main region-side residual strain is less than or equal to 10 points.   
     
     
         2 . The net-like structure according to  claim 1 , wherein an apparent density is greater than or equal to 0.005 g/cm 3  and less than or equal to 0.20 g/cm 3 . 
     
     
         3 . The net-like structure according to  claim 1 , wherein said fibers having a hollow cross section have a fiber size greater than said fibers having a solid cross section, and a difference in fiber size between said fibers having a solid cross section and said fibers having a hollow cross section is greater than or equal to 0.07 mm. 
     
     
         4 . The net-like structure according to  claim 1 , wherein a ratio between 25% compression hardness at pressurization from the side of said solid-section fiber main region and 25% compression hardness at pressurization from the side of said hollow-section fiber main region is greater than or equal to 1.03. 
     
     
         5 . The net-like structure according to  claim 1 , wherein a ratio between 40% compression hardness at pressurization from the side of said solid-section fiber main region and 40% compression hardness at pressurization from the side of said hollow-section fiber main region is greater than or equal to 1.05. 
     
     
         6 . The net-like structure according to  claim 1 , wherein a difference between a compression deflection coefficient at pressurization from the side of said solid-section fiber main region and a compression deflection coefficient at pressurization from the side of said hollow-section fiber main region is less than or equal to 5. 
     
     
         7 . The net-like structure according to  claim 1 , wherein a difference between a hysteresis loss at pressurization from the side of said solid-section fiber main region and a hysteresis loss at pressurization from the side of said hollow-section fiber main region is less than or equal to 5 points. 
     
     
         8 . The net-like structure according to  claim 1 , wherein said thermoplastic elastomer continuous linear body is said polyester-based thermoplastic elastomer continuous linear body, and
 both a hysteresis loss at pressurization from the side of said solid-section fiber main region and a hysteresis loss at pressurization from the side of said hollow-section fiber main region are less than or equal to 30%.   
     
     
         9 . The net-like structure according to  claim 1 , wherein said thermoplastic elastomer continuous linear body is said polyolefin-based thermoplastic elastomer continuous linear body, and
 both a hysteresis loss at pressurization from the side of said solid-section fiber main region and a hysteresis loss at pressurization from the side of said hollow-section fiber main region are less than or equal to 60%.   
     
     
         10 . A cushion material including the net-like structure according to  claim 1  inside the cushion, wherein the cushion material is usable reversibly.