A peristaltic pump contains a flexible tube, which performs both the suction and the compression of the liquid to be filled. This is achieved by manipulating the external of the tubing, e.g. by rollers. This means that the liquid (product) is only in contact with the tubing. No valves or other mechanical parts to be cleaned after the filling has been completed.
As the FDA and GMP rules are becoming more difficult and expensive to comply with, peristaltic filling is regarded as an attractive alternative to other filling principles, as cleaning is just a matter of exchanging the tubes.
Peristaltic pumping benefits
- Less cleaning validation
- No product contamination
- Very short change-over times
- Limited waste of expensive products
- High precision (i.e. 0.5% on filling of 1 ml)
- Easy to adjust and calibrate
- Same pump head can fill from 0.1 ml to 250 ml without changing mechanical parts
- Back-suction prevents after dripping
- Filling speed and acceleration can easily be adjusted when filling e.g. foaming products
- The product is not in contact with any mechanical parts and the liquid handling is very gentle to products containing living cells, i.e. fragile blood cells are not damaged by pumps based on the peristaltic principle.
- Pharmaceutical industry
- Contract filling and packaging