Device to compensate load alternation

Our device to compensate load alternation (in short CLA) for sets of deep hardened matched steel embossing rollers provides new embossing quality

If you use sets of deep hardened matched steel embossing rollers to emboss your tissue products, you are aware that the ply bonding in the cross-bar section is always critical. The device to compensate load alternation patented by UniMaTec has now solved this problem: the controlled movement of the deep hardened matched steel embossing rollers when the load  alternates from the web bar section to the cross bar section provides you with a completely new standard of embossing quality. An extremely even ply bonding can at last be obtained for the whole product!

Further advantages of the device to compensate load alternation for your production:

  • Minimisation of the traditional engraving height from currently 0.45 to as little as 0.2 mm. Even with these values, ply bonding in cross direction is still guaranteed.
  • Our device enables you to process modern, much thinner materials in an optimal way.
  • The UniMaTec device to compensate load alternation reliably solves the problem – due to edge embossing - of undesirable inclinations often seen with bulk packs.

The technology

The UniMaTec device to compensate load alternation mainly consists of 2 sets of half-shells which are coupled through pressure springs, pressure pistons and screws. These pre-assembled units are then placed on both rolls, on the right and left of the roller bodies, between two deep groove ball bearings pre-mounted on the journals.

The deep hardened matched steel embossing rollers having been prepared to receive the device to compensate load alternation are now assembled with the spherical roller bearings, the bearing housings and the nip adjustment device and installed in the roll frame. Afterwards the rolls are adjusted to the material to be embossed. If you want to emboss several material thicknesses or several types of material, the embossing nip is first dimensioned for the thinnest material. If necessary, a suitable shim can be inserted between the components of the nip adjustment device if different materials are to be processed. Once this basic adjustment has been made, the rolls are pushed apart (approx. 30-40 mm) in order to mount the devices to compensate load alternation. Once the rolls are in the preset position again, the opening nip can be adjusted as usual.

When the deep hardened matched steel embossing rollers are brought together, the device to compensate load alternation produces a predefined counter pressure moving the rolls in the direction opposite to the pressure direction until the bearing play has been completely eliminated in the pressure direction. This makes it possible for the rolls to encounter the load alternation without bearing play - i.e. virtually transfixed - in the embossing direction.

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