Stretchable wire member
An object is to solve problems associated with a stretchable wire member that includes, for example, a garment with stretchable wires formed thereon, that is, to solve the problems of wrinkles and undulations that often occur after the garment is stretched. A stretchable wire member includes a fabric; a base layer disposed on a surface of the fabric; a conductive layer disposed in part of the fabric, the conductive layer being on a surface of the base layer; and a protective layer covering the conductive layer. In the stretchable wire member, an elastic modulus E′3 of a multilayer body portion including the fabric, the base layer, and the protective layer ranges from 1 MPa to 6 MPa.
1. A stretchable wire member comprising:
a fabric;
a base layer formed along a surface of the fabric;
a conductive layer disposed on a part of a surface of the base layer; and
a protective layer covering the conductive layer, and another part of the base layer which is not covered by the conductive layer,
wherein an elastic modulus E′3 of a first multilayer body portion including the fabric, the base layer, and the protective layer, excluding the conductive layer, ranges from 1 MPa to 6 MPa.
2. The stretchable wire member according to claim 1 , wherein an elastic modulus E′4 of a second multilayer body portion including the fabric, the base layer, the conductive layer, and the protective layer ranges from 3 MPa to 8 MPa; and
a relation E′4>E′3 is satisfied.
3. The stretchable wire member according to claim 1 , wherein the first multilayer body portion is outside a region having the conductive layer.
4. The stretchable wire member according to claim 1 , wherein an undulation length measured after the stretchable wire member is stretched 100% is less than or equal to 7%.
5. The stretchable wire member according to claim 1 , wherein an undulation height measured after the stretchable wire member is stretched 100% is less than or equal to 7 mm.
6. The stretchable wire member according to claim 1 , wherein the number of undulations counted, in a 50 mm pre-stretch length range, after 100% stretch is one or zero.
7. The stretchable wire member according to claim 1 , wherein a frequency dependence represented by a difference (E′4−E′3) between a storage elastic modulus E′3 of the first multilayer body portion and a storage elastic modulus E′4, the storage elastic modulus E′3 and the storage elastic modulus E′4 being measured at a frequency of 0.1 Hz and a frequency of 28 Hz, respectively, is less than or equal to 0.6 MPa.
8. The stretchable wire member according to claim 1 , wherein an elastic modulus E′1 of the base layer ranges from 1 MPa to 10 MPa;
an elastic modulus E′2 of the conductive layer ranges from 2 MPa to 60 MPa; and
a 100% stretch distortion of the stretchable wire member is less than or equal to 10%.
9. The stretchable wire member according to claim 1 , wherein the fabric is at least one knit that is made in plain stitch, rib stitch, smooth stitch, or any one or combination of textural variations of the stitches; and
a longitudinal direction of the conductive layer is a course direction of the knit.
10. The stretchable wire member according to claim 1 , wherein the fabric is a knit that is made in purl stitch or a textural variation thereof; and
a longitudinal direction of the conductive layer is a wale direction of the knit.
11. The stretchable wire member according to claim 1 , wherein the fabric is at least one knit that is made in tricot, denbigh stitch, vandyke stitch, cord stitch, or any one or combination of textural variations of the stitches; and
a longitudinal direction of the conductive layer is a course direction of the knit.
12. The stretchable wire member according to claim 1 , wherein the base layer extends outward more than 2 mm from an outer edge of the conductive layer.
13. The stretchable wire member according to claim 1 , wherein a ratio of an undulation length measured after 100% stretch to a distortion length under no load is less than two.
14. The stretchable wire member according to claim 1 , wherein a width of the conductive layer is greater than or equal to 0.1 mm and is smaller than or equal to 10 mm.
15. The stretchable wire member according to claim 1 , wherein an elastic modulus E′1 of the base layer and an elastic modulus E′2 of the conductive layer satisfy a relation E′2>E′1.