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It is also desirable to have a thickness which is less than that of the film used to form the first compartment to ensure a sufficient heat transfer through the film to soften the base web if heat sealing is used. [0077] The thickness of the covering film is generally from 20 to 160 ??m, preferably from 40 to 100 ??m, such as 40 to 80 ??m or 50 to 60 ??m. [0078] This film may be a single-layered f
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