| 摘要 |
The present invention relates to a method of producing an elongate sheet of material (13) that includes barrier flaps (3, 4) which extend along the side-edges of said sheet in spaced relationship with respective side-edges, and which project up from the plane of the sheet. The method comprises the steps of placing along each edge-part of a first elongate sheet (1) a second elongate sheet (3, 4) whose width is smaller than the width of the first sheet, such that the outer side-edges of respective second sheets will lie edge-to-edge with the side-edges of the first sheet; placing along each edge-part of the first elongate sheet (1) and on top of respective second sheets a third elongate sheet (6, 7) whose width is smaller than the width of the first sheet, such that the outer side-edges of respective third sheets will lie edge-to-edge with the side-edges of the first sheet and the second sheets; joining the first, second and third sheets together with a join (11, 12) that extends along the outer side-edges of the sheets; and swinging the third sheets (6, 7) laterally outwards through 180 DEG around their join lines, wherewith the composite sheet consisting of the mutually join first, second and third sheets is stretched laterally and wherewith the second sheet (3, 4) rises up from the plane of the first and third sheets. The invention also relates to an outer sheet produced in accordance with the method.
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