Fibrous network structure having excellent compression durability

A process for producing a network structure comprising:

• distributing a polyester-based thermoplastic elastomer to nozzle orifices from a multi-row nozzle having a plurality of orifices,
• discharging the polyester-based thermoplastic elastomer downward through the nozzle at a spinning temperature higher by not less than 20° C. and less than 120° C. than the melting point of the polyester-based thermoplastic elastomer to form continuous linear structures,
• contacting the continuous linear structures each other in a molten state and thereby fusing the continuous linear structures to form a three-dimensional structure,
• sandwiching the three-dimensional structure with a take-up conveyor net disposed so as to be partially exposed over a water surface,
• cooling the three-dimensional structure with cooling water in a cooling bath,
• drawing out the three-dimensional structure,
• draining or drying the three-dimensional structure to obtain the network structure having both surface or one surface smoothed, wherein
• a net surface temperature of the take-up conveyor net over the water surface at or around a fiber-falling region is not less than 80° C., the network structure has a 50%-constant displacement repeated compression residual strain after 80000 times of repetition of not more than 15%, and
• the network structure has a 50%-compression hardness retention after 50%-constant displacement repeated compression of not less than 85%.

A process for producing a network structure comprising:

• distributing a polyester-based thermoplastic elastomer to nozzle orifices from a multi-row nozzle having a plurality of orifices,
• discharging the polyester-based thermoplastic elastomer downward through the nozzle at a spinning temperature higher by not less than 20° C. and less than 120° C. than the melting point of the polyester-based thermoplastic elastomer to form continuous linear structures,
• contacting the continuous linear structures each other in a molten state and thereby fusing the continuous linear structures to form a three-dimensional structure,
• sandwiching the three-dimensional structure with a take-up conveyor net,
• cooling the three-dimensional structure with cooling water in a cooling bath,
• drawing out the three-dimensional structure,
• draining or drying the three-dimensional structure to obtain the network structure having both surface or one surface smoothed, wherein
• a temperature of the cooling water in the cooling bath at or around a fiber-falling region is not less than 80° C., and
• a nozzle face-cooling water distance is 25 cm to 35 cm,
• the network structure has a 50%-constant displacement repeated compression residual strain after 80000 times of repetition of not more than 15%, and
• the network structure has a 50%-compression hardness retention after 50%-constant displacement repeated compression of not less than 85%.