Method and apparatus for removing wrapping from rolls

A method for removing a wrapping, such as plastic film, from a roll of material, said roll having a cylindrical body, a first roll body end portion with a first end gable, a second roll body end portion with a second end gable, the method comprising the steps of:

• moving a cutting means into abutment against the wrapping at said first roll body end portion such that the wrapping is punctured, rotating the roll about its center axis over a rotational angle from 270 to 360 degrees, at the same time as the wrapping is cut by the cutting means at said first roll body end portion, the cutting means forming an end portion cutting angle relative said first end gable of the first end portion,
• moving the cutting means axially along the center axis of the roll towards said second roll body end portion and at the same time rotating the roll about said center axis such that the wrapping on an envelope surface of the roll is cut in a helical manner, wherein the wrapping on the envelope surface of the roll is cut with the cutting means forming an envelope surface cutting angle relative said first end gable of said first end portion, wherein said envelope surface cutting angle is larger than said end portion cutting angle;
• and
• rotating the roll further about its center axis over the rotational angle from 270 to 360 degrees, at the same time as the wrapping is cut by the cutting means at said second roll body end portion, the cutting means forming said end portion cutting angle,
• such that the wrapping is cut off the roll automatically and in one continuous piece.