„Diamond Coated Rotor“ for preeflow

A new standard in the micro dispensing of highly abrasive Materials within the 1-component and 2-component range

Precise, repeatable, and process-safe applications in the field of micro dispensing have always been the emphasis of the preeflow by ViscoTec brand. Thanks to the volumetric endless piston principle, almost all low to high viscosity materials can be processed.

Solids-laden fluids, or filled material with, in some cases, highly abrasive properties are currently gaining in importance and will do so in the future. These are mostly thermally or electrically conductive materials in the 1-component and 2-component range. Particularly frequent are applications with thermal gap fillers or thermal conductive pastes, which are becoming increasingly important due to the continuing boom in the area of electronics and circuit board production, from small wearables to smartphones and tablets to electric vehicles.

The abrasive properties of such materials are particularly challenging for the dispensing equipment and can lead to severe and premature wear. By selecting the most suitable set-up and parameters, the service life can be optimized with standard equipment, but the rotor and stator wear faster than usual, and as a result, need to be replaced. This is due to the technology and is the case for all dispensers working according to the progressive cavity pump technology.

preeflow has taken up this challenge and developed a solution to significantly improve the service life of the system when processing highly abrasive materials, especially in the small and extremely small quantity range. At the end of intensive development work and after a wide range of field and long-term tests, specially coated rotors proved to be the best technical and commercial solution. These rotors refined with a so-called "Diamond Coating" (in short: "DC") can double or triple the lifetime of the system until the rotor must be replaced. In laboratory settings, working with a widely used and highly abrasive 2-component gap filler, the service life could even be improved significantly beyond that. For both existing and new users, this offers numerous advantages, including:

▪ Improvement of process reliability through a volumetric dispensing system

▪ Cost reduction due to reduced spare part requirements

▪ Reduced set-up and downtimes

▪ Safer and easier handling compared to ceramic rotors

▪ Drop-in replacement: No additional technical adjustments required

The rotors with diamond coating are now available for the eco-PENs and eco-DUOs in sizes 330, 450 and 600.