Described herein is an array of finished products, each finished product in the array having a length relative error of less than 0.81% of a target length, H is disclosed. The finished products, which may be toilet paper and kitchen towels, are formed from transversally cutting elongate logs of convolutely wound web materials.

A paper roll cutting device comprises a rotating motorized arm (20), provided with a rotation axis (21) fixed in the space, and at least one cutting blade (30) to cut at least a paper stick (100) obtaining said paper rolls connected to the rotating motorized arm (20), wherein the rotation axis (31) of the cutting blade (30) is cyclically movable during the rotation of the motorized arm (20), the distance between the rotation axis (21) of the rotating arm (20) and the rotation axis (31) of the cutting blade (30) being progressively cyclically variable during the rotation of the motorized arm (20) with a minimum distance at the lower point of the rotation trajectory of the cutting blade (30).

A cutting system has a processing machine and a sheet cutter which selectively attaches to the processing machine. The processing machine includes a conveying mechanism, a processing unit, and a lid. The conveying mechanism is configured to convey the sheet. The processing unit is configured to process the sheet conveyed by the conveying mechanism. The lid is configured to open and close a conveyance path through which the sheet is conveyed. The sheet cutter includes a main body, a cutting unit attached to the main body and including a cutter slidable in a first direction, the cutting unit being configured to cut, along in the first direction, the sheet with the cutter, and an attacher configured to attach the main body to the processing machine. In a case where the main body is attached to the processing machine, the main body is positioned relative to the lid.

This roll cutter device is provided with roll units in which a thin plate material is passed between a pair of rolls. Three sets of the roll units are provided in an axial direction of the rolls in such a way that central axes of the rolls lie on one straight line in the axial direction. The configuration is such that a plurality of the roll units including an upper roll and a receiving roll exist in the axial direction.

A blade sharpening system for log saw machines is provided. An example multiphase grinding wheel has a grinding face with one or more abrasive concentric rings for sharpening the cutting blade of the log saw machine, and one or more padded concentric rings consisting of fiber padding. Sharpening with the multiphase grinding wheel improves cut quality, increases blade life, removes glues and varnishes from the cutting blade, reduces blade deformation, and hones the edge of the cutting blade. A pneumatic tensioning system uses air bladders to apply a dynamically cushioned pressure between the grinding wheels and the cutting blade. The fiber-padded grinding wheels and the air bladder tensioner provide improved sharpness of the cutting blade and longer life for the mechanical components. The padded grinding wheels decrease fire risk, and the tensioner can be operated remotely, decreasing human injuries common with conventional setup actions near the sharp cutting blade.

A cutting die for rotary die-cutting of a label laminates is described herein. The cutting tools of the die include at least one of the following cutting edge parameters: effective height, shape and bevel angle arranged to be different in a first direction when compared to a second direction of the cutting die. The use of the cutting die, a method for designing a cutting die and a method for die-cutting a label laminate are also described.

A film cutting apparatus includes: a punch plate including a first punch protruded on an upper surface and a second punch protruded on a lower surface; a first die plate having a first hole corresponding to the first punch, the first die plate providing a surface on which a film is provided; a second die plate having a second hole corresponding to the second punch, the second die plate providing a surface on which a film is provided; at least two guide bars penetrating the first die plate and the punch plate and fixed to the second die plate; a first elastic member between the first die plate and the punch plate; a second elastic member between the punch plate and the second die plate; and an elevator configured to press the first die plate.

Slabbing machine for removing material M wound around a reel R, comprising a frame; a structure for holding the material M wound around the reel R; a beam connected to the frame and displaceable along the frame in a radial direction y; a blade holder connected to the beam and displaceable along the beam in a longitudinal direction x perpendicular to the radial direction y; a blade mounted on the blade holder for cutting the material M down to a cutting plane p perpendicular to the radial direction y and located at the farthest end of the blade in radial direction y; wherein one or several air outlets are mounted on the blade holder 1 and directed towards the cutting plane p for blowing air towards the cutting plane p.

The machine includes a feeding path for the logs to be cut and a cutting head arranged along the feeding path. The cutting head includes a coupling for a disc-shaped cutting blade and is designed to impart the disc-shaped cutting blade a rotary motion around the axis thereof and a cyclic movement to cut the logs into single rolls, and to allow the logs to move forward along the feeding path. The machine also includes at least a grinding unit, including at least one grinding wheel mounted onto a rotation shaft and co-acting with a side of the disc-shaped cutting blade to grind the cutting edge of the same disc-shaped cutting blade. A controlled approach system is also provided to move the grinding wheel towards the disc-shaped cutting blade.

The grinding unit includes at least one grinding wheel adapted to rotate around a respective rotation axis, and a thrust actuator adapted to push the grinding wheel against a cutting edge of a disc-shaped cutting blade. A load cell is also provided for detecting an axial thrust exerted on the grinding wheel.