| CPC B32B 7/14 (2013.01) [B32B 5/022 (2013.01); B32B 5/26 (2013.01); A61F 2013/15552 (2013.01); A61F 2013/49023 (2013.01); A61F 2013/49033 (2013.01); A61F 13/4906 (2013.01); B29C 65/08 (2013.01); B29C 66/21 (2013.01); B29L 2031/4878 (2013.01)] | 8 Claims |
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5. A stretchable member, comprising:
an elastic sheet stretchable structure in which an elastic sheet is interposed between a first sheet layer having air permeability and a second sheet layer having air permeability, and the first sheet layer and the second sheet layer are bonded at a large number of fused dot-like bonded portions arranged at intervals, each of the bonded portions extending along a longitudinal axis,
wherein a stretchable region having the elastic sheet stretchable structure is capable of being expanded and contracted in a stretchable direction due to a contraction force of the elastic sheet,
the stretchable region has at least two stretchable regions including a first stretchable region and a second stretchable region,
the first stretchable region contains a plurality of rows of first bonded portions aligned in a first direction with their longitudinal axes aligned to the first direction, the rows of the first bonded portions being arranged in a second direction orthogonal to the first direction, and
the second stretchable region contains a plurality of rows of second bonded portions aligned in the second direction orthogonal to the first direction with their longitudinal axes aligned to the second direction, the rows of the second bonded portions being arranged in the first direction orthogonal to the second direction,
an intermediate stretchable region is provided between the first stretchable region and the second stretchable region,
in a case where
(1) a pitch of the bonded portions in the intermediate stretchable region in a stretchable direction is Xm,
(2) a pitch of the bonded portions in the first stretchable region in a stretchable direction is Xa, and
(3) a pitch of the bonded portions in the second stretchable region in a stretchable direction is Xb,
Xm≤{(Xa+Xb)/2}×1.6 is established,
wherein, (1) where the first direction is inclined with respect to a direction orthogonal to the stretchable direction,
a separation distance in the stretchable direction and in the direction orthogonal thereto between bonded portions located on a first-stretchable-region side in the stretchable direction of the intermediate stretchable region and bonded portions located on an intermediate-stretchable-region side in the stretchable direction of the first stretchable region in an elastic limit elongation state is 10 mm or less,
a separation distance in the first direction between bonded portions in the intermediate stretchable region is 10 mm or less,
a separation distance in the stretchable direction and in the direction orthogonal thereto between bonded portions located on the second-stretchable-region side in the stretchable direction of the intermediate stretchable region and bonded portions located on the intermediate-stretchable-region side in the stretchable direction of the second stretchable region in an elastic limit elongation state is 10 mm or less, or
(2) where the first direction is aligned to the direction orthogonal to the stretchable direction,
a separation distance in the stretchable direction between bonded portions located on a first-stretchable-region side in the stretchable direction of the intermediate stretchable region and bonded portions located on an intermediate-stretchable-region side in the stretchable direction of the first stretchable region in an elastic limit elongation state is 10 mm or less,
a separation distance in the stretchable direction between bonded portions located on second-stretchable-region side in the stretchable direction of the intermediate stretchable region and bonded portions located on the intermediate-stretchable-region side in the stretchable direction of the second stretchable region in an elastic limit elongation state is 10 mm or less, and a separation distance in the first direction between the bonded portions in the intermediate-stretchable region and the bonded portions in the second stretchable region is 10 mm or less.
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