| 摘要 |
1. A composite material comprising a top layer (1), a bottom layer (2) which is directly joined thereto along substantially parallel, spaced-apart ultrasonic weld seams (5), and an intermediate layer which is in the form of individual elongate portions (3) of material, which are disposed substantially parallel to the weld seams, between the weld seams, in channels formed by the top and bottom layers, characterised in that the top layer (1) and/or the bottom layer (2) and/or the individual elongate portions (3) comprise elastic material with resiliency, the top layer (1) and the bottom layer (2) are welded with a tensile stress which differs as between the two layers or in relation to the elongate portions (3) of material in the longitudinal direction of the elongate portions of material, in a ratio of 1.1 to 1.6 relative to at least one of the other two layers, and the layers (1, 2) or elongate portions (3), which are welded with the lower degree of tensile stress, are reduced in length by resilient recovery of at least one of the layers or elongate portions of material, which are welded with the higher degree of tensile stress. |
