To provide the perfect semi-conductive layer for its electrostatic assist (ESA) 2.0 solution for roller and sleeve coverings, Hannecard has developed an innovative system that uses nanoparticles of carbon.
Nanoparticles are components which have a size of 1 to 100nm (1 nm = 10-3µm). These components are so small that they don’t respond to Newton’s mechanics principles, but rather to the principles of quantum physics.
Before Hannecard introduced the option of nanoparticles, the only alternative was the use of carbon black, which is sized, depending upon the grade used, between 1 and 50µm. The shape and the size even in the same grade is quite random.
The advantages of the nanoparticles in the ESA 2.0 coverings include:
- Homogeneity in size and shape, which gives constant properties independent of their orientation in the compound.
- Perfect dispersion in liquids: as they have “no mass” they mix in any liquid with an even distribution (providing the appropriate material is used to dose them).
- Same mechanical, electrical and chemical in any direction: this is a key point because over time any other covering loses electrical properties due to the orientation of the carbon under load.
The nanoparticles of carbon are just a part of the covering. Hannecard uses a proprietary process to use these components inside of the polyurethane ESA 2.0. The use of such products is subject to health regulations, which we fulfil and enforce for all production teams involved.
The combination of polyurethane and nanoparticles of carbon is the ideal match for the requirements in gravure printing with ESA. The polyurethane offers resistance to abrasion, deformation and cuts. The nanoparticles of carbon provide electrical resistance constancy under working conditions.
Electrostatic assist (ESA) 2.0 roller and sleeve coverings are available in three product ranges: HannePearl, HanneVision and HanneCrystal. All Hannecard ESA 2.0 products were developed to meet two goals: safety in operations and print quality.