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DRIPPING |
Specification
Principle of technology Dripping is the simplest particle formation Principle of technology Dripping is the simplest particle formation technique we use. It involves a precursor liquid passing through a nozzle of appropriate diameter, then being broken into equally sized droplets by gravitational forces. The droplets are further processed to form particles by cross-linking or polymerization (hardening process) of the precursor liquid. It is a requirement of the technology that the hardening process is very fast in order to achieve optimal particle quality. If no such fast hardening process is feasible, e.g. in cases where the hardening process is based on radical polymerization, the dripping technology has to be combined with other technologies such as preeTec’s proprietary tandem process, or a two phase system process. Dripping technology gives a very narrow bead size distribution. However, the volumetric flow per nozzle is limited and the size of the resulting particles can only be controlled within a narrow range. Materials that can be processed
Application examples
Superabsorbent polymer (SAP) Beads made from modified acrylics with a very low size distribution (mean size 1.8 mm; sdev 0.01mm) produced by dripping method in a two phase system. |
- Dripping
Production of microparticles in the size range of 0.5 to 4 mm with very narrow size distribution at low to medium volumetric flow