Method for winding a board, paper or material web and a winder for a paper, board or materail web

A method for winding a paper, board or material web, comprising the steps of:

• winding simultaneously a plurality of separate rolls, each of the plurality of rolls having a winding core, the winding cores forming a plurality of adjacent abutting winding cores having roll ends placed against each other, the ends formed by severing cuts which deviate from a plane perpendicular to an axis defined by each winding core;
• wherein the winding cores and the separate rolls formed thereon are positioned side by side supported on at last two winder drums;
• coupling the winding cores so that the axis defined by each winding core is aligned along a common axis of rotation during winding, by the roll ends placed against each other;
• loading the core ends against one another by core chucks arranged in connection with a first free end and a second free end of outermost winding cores, so that the winding core ends placed against each other are loaded longitudinally;
• and
• causing the winding cores to extend longitudinally by winding simultaneously the plurality of separate rolls;
• and
• as the web is wound on the winding cores, yielding longitudinally, portions of the winding cores ends formed by the severing cuts, said portions of the winding cores ends formed by the severing cuts having a profile of a depth and shape so as to yield longitudinally, thus provide axial play between the winding cores.

A winder for a paper, board or material web, comprising

• a two-drum type winder having at least one drum;
• a plurality of adjacent winding cores mounted and supported on the at least one drum of the winder, the winding cores defining axes, and having roll ends placed against each other, the ends formed by severing cuts which deviate from a plane perpendicular to the winding core axes, the plurality of winding cores being in receiving relation to a slit component of the web, the plurality of winding cores defining outermost winding cores having free ends;
• a core chuck engageable with each of the free ends of the outermost winding cores so as to keep the winding cores placed one after the other in place one against the other;
• and
• wherein the winding core ends placed against each other are coupled to each other by the severing cuts, and wherein the severing cuts have a shape dimensioned such that there remains allowance for longitudinal yielding between the winding core ends.

A method of manufacturing a winding core for a winder, comprising the steps of:

• making a plurality of winding cores;
• forming each winding core of the plurality of winding core to form a first severing cut which forms a first axial end of each winding core, which first severing cut is formed to have first grooves which deviate from a plane perpendicular to an axis defined by the winding core;
• further forming each core of the plurality of winding cores to form a second severing cut which forms a second axial end of each winding core, the second severing cut being formed to have second grooves which deviate from the plane perpendicular to the axis defined by the winding core;
• and
• wherein the formed first grooves of the first severing cut correspond to the formed second grooves of the second severing cut and wherein the correspondence is not complete such that the first grooves and the second grooves do not fully correspond to each other but the grooves on the first sides of the winding cores are unequal in depth to the grooves of the second sides, thereby providing axial play.