Three-dimensional net-like structure
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United States of America Patent
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Mar 20, 2018
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app pub date -
Dec 14, 2012
filing date -
Dec 14, 2011
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Abstract
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/cm3 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 D2/D1 against shear rate when a molten thermoplastic resin is extruded to filaments from a capillary having a tube inner diameter D1 of 1.0 mm and a length of 10 mm and D2 denotes a diameter of cross section of the filaments extruded and cooled down.
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