FIELD: printing arts. SUBSTANCE: sheet unit has a sheet with the first set of bellows folds and the second set of bellows folds located across them, which form a great number of rows of segments positioned in the first and second directions, with a great number of segments in each row. Provision is made for a means of attachment of the sheet unit in folded state made in the form of sealing means, means for opening of sealing means and a means for attachment of the sheet unit to the product located in any extreme row of the unit segments. EFFECT: improved design. 11 cl, 12 dwg
