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Additional option: Lubrication felt

Additional option: lubrication device with felt

The lubrication device with felt from DIENES

For special applications, it has been proven in practice to continuously wet the top knife edges with a liquid in order to improve the cutting edge quality. This can be done with the help of felt. Knife lubrication is mainly used for cutting adhesive films and papers, metal foils, especially aluminum, copper and brass.

The impregnation of the felt can be done in different ways. Either the felt is placed in a liquid bath until it is saturated and then inserted into the respective lubrication device or the lubrication felt located in the holder is moistened at regular intervals / continuously. If the wetting is too low, the so-called built-up edge occurs when cutting metal foils and particles adhere to the knife edges in the case of labels, label stock, etc.. This can reduce the quality of the cut edges and even lead to rejects.

To ensure continuous wetting of the knife edges, it is possible to automate this process. In this case, the exact amount of liquid is fed to the knife from an oil reservoir as required and takes care of the continuous wetting.

With the additional lubrication felt function from DIENES, it is ensured that the felt can follow the axial knife movement. Constant contact with the knife edge is achieved by means of an adjusting screw. The lubrication device can be swung out for easy knife replacement.

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Application fields of the knife lubrication with felt

In principle, there are several possibilities for knife lubrication. In the case of fixed felt, a felt bar or felt roller is mounted over the entire working width of the machine, often with a supply reservoir. Alternatively, a single felt can be mounted on the respective knife holder. A pivoting felt follows the axial movement of the upper knife, and by means of an adjusting screw, constant contact with the knife edge is achieved. In this case, the lubrication device can be swung off for knife replacement.

Usually, a felt is clamped in a U-shaped metal rail, with the top knife edges dipping into the protruding felt. A felt shaft, on the other hand, requires considerably more installation space, depending on the working width of the winder.

Lubrication is then usually provided by a felt impregnated with liquid. While the main task of knife lubrication for adhesive foils is to minimize the adhesion of adhesive residues, the objective for cutting metal foils is somewhat different. Here, it is primarily important that the fine metal particles produced during the cutting process do not settle on the knife edge and thus lead to a so-called built-up edge. The deposits between top and bottom knife edges have a negative effect on the quality of the cut edge.

Caution, in the simplest design the felt is fixed in the hand guard and thus cannot follow the horizontal stroke of the knife. Depending on the size of the horizontal stroke, this results in an inclined position of the upper knife to the respective lower knife edge and increased friction. To eliminate this effect, which is detrimental to the cutting result, DIENES has developed lubrication devices that follow the horizontal movement of the knife.

All advantages at a glance

  • Einsparung von Kosten
  • Optimiertes Auftragen des Schmierstoffes
  • Erheblich höhere Messerstandzeit
  • Bessere Schnittkantenqualität
  • Geringster Schmierstoffbedarf
  • Einfache, sichere und saubere Handhabung
  • Rückstandsfreies Arbeiten
On the left the adjusting slide type “Easy Set” and on the right the lubrication device.

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