(57) The invention relates to a friction surface comprising a conventional foil (1), such
as paper or plastic foil, and hot melt bulges (2) and pattern formed by them made
on the foil surface by a screening technique. The foil (1) chosen to be used should
be such that it is most suitable for the specific package, but the thickness of it
should preferably be more than 35 mm and it should at least temporarily endure the
heat of about 140 - 180° C, which the hot melt has. The bulges made of hot melt are
most advantageously made 50-150 µm high, whereby their ability to adhere to other
surfaces is excellent. By using filling materials of the hot melts the friction can
be increased even more, but in such cases normally thicker basic foil has to be used
so as to prevent the foil from tearing. By using a friction surface, considerably
high piles of packages can be made. Because the hot melt can be remelted, the top
packages can be bound together by spreading any kind of foil on them, which can be
attached on the friction surface by heating.
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