| 摘要 |
<p>By taking into account the difficulty in smoothly bending along the shape of, for example, a care bed, there is provided a three-dimensional net-like structure made from polyethylene having a swelling ratio dependent on a shear rate such as to be 0.93 to 1.16 at a shear rate of 24.3 sec -1 and 1.15 to 1.34 at a shear rate of 608 sec -1 and having an MFR of 3 to 35 g/ 10 min and a density of 0.82 to 0.95 g/cm 3 and configured to have a spring structure of filaments randomly brought into contact with and tangled with one another, have a three-dimensional striped sparse-dense configuration in a lateral direction relative to an extrusion direction. The swelling ratio is shown as D 2 /D 1 against shear rate when a molten thermoplastic resin is extruded to filaments from a capillary having a tube inner diameter D 1 of 1.0 mmÆ and a length of 10 mm and D 2 denotes a diameter of cross section of the filaments extruded and cooled down.</p> |
