| http://www.w3.org/ns/prov#value | - The tight-sealing is performed of each of the two edges 2a or 3a of one of the individual strips 2 and 3 on the corresponding edge 2a or 3a of the other individual strip over a length at least equal to a forward movement step of the composite strip 1 in such a manner as to obtain lateral sealing sections and a tubular packing element.
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