An unwinder for web material includes: a first and second reel holder, a dynamic storage device, a junction device arranged between the first or second reel holder and the dynamic storage device and configured to join an end portion of web material running out on the first reel to an initial portion of web material of the second reel, an actuator configured to pull the web material. The dynamic storage device includes: a plurality of first return rollers, a carriage mounted on a guide and free to move along the guide approaching or moving away from the first return rollers, a plurality of second return rollers mounted idly on the carriage. The return rollers define a zigzag path for the web material. The dynamic storage device includes a plurality of motorized shafts and each first return roller is mounted by means of two rolling bearings on a respective motorized shaft.

An unwinder for web material includes: a first and second reel holder, a dynamic storage device, a junction device arranged between the first or second reel holder and the dynamic storage device and configured to join an end portion of web material running out on the first reel to an initial portion of web material of the second reel, an actuator configured to pull the web material. The dynamic storage device includes: a plurality of first return rollers, a carriage mounted on a guide and free to move along the guide approaching or moving away from the first return rollers, a plurality of second return rollers mounted idly on the carriage. The return rollers define a zigzag path for the web material. The dynamic storage device includes a plurality of motorized shafts and each first return roller is mounted by means of two rolling bearings on a respective motorized shaft.

Disclosed is a festooner and a method for buffering a strip, the festooner having a first set of buffer rollers and a second set of buffer rollers, wherein the first set of buffer rollers and the second set of buffer rollers define a meandering first buffer path between them, wherein the festooner further includes a first endless drive element for driving the first set of buffer rollers and the second set of buffer rollers. The festooner further includes a third set of buffer rollers and a fourth set of buffer rollers coaxial to the first set of buffer rollers and the second set of buffer rollers, respectively, defining a meandering second buffer path between them. The festooner further includes a second endless drive element for driving the third set of buffer rollers and the fourth set of buffer rollers.

Disclosed is a festooner and a method for buffering a strip, wherein the festooner includes a first holder and a second holder which are oppositely movable towards and away from each other in a buffer direction to vary a buffer capacity of the festooner, and a first set of buffer rollers and a second set of buffer rollers held by the first holder and the second holder, respectively, wherein the first set of buffer rollers and the second set of buffer rollers define a meandering buffer path between them. The festooner further includes an endless drive element for driving each buffer roller, wherein the festooner further includes an overlength collector for collecting and paying out an overlength of the endless drive element.