Elastic composite tape
An elastic composite strip has a longitudinally elongated substrate strip having a pair of opposite faces and formed of an elastomer that is highly stretchable longitudinally but only limitedly or not stretchy at all transversely. A respective soft knit fabric cover strip that is highly stretchable longitudinally but only limitedly or not stretchy at all transversely extends longitudinally on each of the faces. Respective arrays of longitudinally spaced and transversely extending lines of adhesive are bonded to the faces and to filaments of the respective cover strips.
1. A uniaxially stretchable elastic composite tape comprising:
a perforated, longitudinally elongated, elastic, and generally planar substrate foil that can stretch greatly longitudinally and not stretch significantly transversely in its plane;
at least one outer warp-knit textile layer juxtaposed with the substrate foil and formed of transversely extending warp chains and longitudinally extending weft filaments, the weft filaments being loose such that the layer can stretch greatly longitudinally, the warp chains being relatively nonstretchable such that the layer cannot stretch significantly transversely; and
adhesive adhering the outer knit textile layer to the substrate foil.
2. The elastic composite tape defined in claim 1 wherein the adhesive is in zones separated by adhesive free zones.
3. The elastic composite tape defined in claim 2 wherein the adhesive zones are thin, generally parallel, longitudinally spaced, and transversely extending strips.
4. The elastic composite tape defined in claim 1 wherein the foil comprises an elastic core layer and a pair of polyolefin cover layers between which the core layer is sandwiched.
5. The elastic composite tape defined in claim 1 wherein the knit layer is formed of yarns made of a polyamide, polyester, polypropylene, wool or cotton.
6. The elastic composite tape defined in claim 5 wherein there are two such outer knit textile layers between which the substrate foil is sandwiched.
7. The elastic composite tape defined in claim 6 wherein the outer layers extend past an outer edge of the substrate foil and are there laminated to each other.
8. The elastic composite tape defined in claim 1 wherein the outer warp-knit textile layer has a weight per unit area between 15 and 50 g/m 2 and that the elastic substrate foil has a thickness from 20 to 100 μm.
9. The elastic composite tape defined in claim 1 wherein the tape can be stretched longitudinally by 50% to 150%, has a permanent deformation after plural stretchings of at most 15%, and a resistance to longitudinal tearing of more than 25 N with a width of 50 mm.
10. A uniaxially stretchable elastic composite tape comprising:
a perforated, longitudinally elongated, elastic, and generally planar substrate foil that can stretch greatly longitudinally and not stretch significantly transversely in its plane;
two outer warp-knit textile layer sandwiching the substrate foil and each being able to stretch greatly longitudinally and not stretch significantly transversely, the warp-knit textile layers having ends extending longitudinally past the substrate foil and laminated together; and
respective arrays of longitudinally spaced and transversely extending adhesive strips adhering the outer warp-knit textile layers to the substrate foil, the adhesive strips being separated by transversely extending adhesive-free zones.