The invention relates to a method for producing a bobbin comprising a plurality of wounds of a laminated sheet, the method comprising the steps of: •providing a continuous sheet of alkaloids containing material having a free surface; •providing a continuous sheet of a first protective material having a free surface; •adhering the free surface of the continuous sheet of the first protective material to the free surface of the continuous sheet of alkaloids containing material to form a continuous laminated sheet comprising at least one layer of alkaloids containing material and at least one layer of a first protective material, wherein said at least one layer of alkaloids containing material and said at least one layer of a first protective material define an adhesion surface between them; •feeding said laminated sheet to a rotatable center core; •rotating the center core so as to wind said continuous laminated sheet around it in such a way to form said bobbin comprising a plurality of wounds of a continuous laminated sheet comprising at least one layer of alkaloids containing material and at least one layer of a first protective material.