FIELD: sealing elements.
SUBSTANCE: stretchable structure with an elastic sheet is provided, in which the first sheet layer and the second sheet layer are fastened by means of holes 31 for connecting connected sections of sheets passing through elastic film 30, in a set of spaced connected sections of sheets, groups 40 and 40 of connected sections in a stretchable zone have a mutual arrangement, in which they intersect line ED passing in the direction of stretching in corresponding places in orthogonal direction LD, or a mutual arrangement, in which they do not intersect line ED passing in the direction of stretching within a dividing interval with a width of 0.5 mm or less, determined in direction LD orthogonal to line ED passing in the direction of stretching, and groups 40 and 40 of connected sections have a mutual arrangement, in which they do not intersect an inclined line within the dividing interval with a given width H determined in the orthogonal direction from a group of inclined lines bounded in the orthogonal direction by inclined lines q crossing line ED passing in the direction of stretching at an angle γ located within the range of angles of 45 degrees or less.
EFFECT: excessive closing of connection holes is prevented, which leads to a decrease in air permeability.
3 cl, 25 dwg
