MULTILAYER PAPER MATERIAL, METHOD FOR ITS FORMING AND METHOD FOR OBTAINING THREE-DIMENSIONAL CONTAINERS

摘要

A multilayer papery material comprising at least one first sheet (2, 12) of three-dimensional structure and at least one second sheet (14, 14') fixed to the first sheet (2, 12) and defining empty spaces therewith, characterised in that at least said second sheet (14, 14') is made of papery material having a degree of extensibility of not less than 5% in all directions.