There are applications, e.g. in the chemicals industry or in the paints and lacquers industry, where elastomers cannot be used. Pumps would be susceptible to chemical attack, particularly when using mixtures of different solvents. Therefore, not only the medium itself but also the cleaning process must be taken into consideration when designing the pump.
In this case, a viable alternative would be to use PTFE (Teflon) both in the secondary seals and in the stator. KNOLL Maschinenbau recently assembled an MX20 for a south German paints manufacturer to meet its special requirements of suitability for use in paints production and frequent cleaning with a mixture of solvents. Given that these solvents are recycled, their composition and concentration may change, but this must not alter the properties of the eccentric screw pump.
To this end, the MX20 was fitted with a solid stator made of Teflon. The excentric movement of the rotor is compensated by a titanium torsion bar. No elastomer seals are used. As a result, the MX, first, has the required level of resistance to cleaning with solvents and, second, retains its KNOLL trademark properties:
- High ease of servicing even when using non-standard components;
- Good cleanability (CIP and SIP);
- Excellent pump characteristics (low pulsation, high pressures, suitability for high viscosity levels).
In the case of this special version, attention was also given to preserving the modularity of all key components so that the paints manufacturer can, when necessary, adapt the pump to changing conditions within the manufacturing process.
All in all, this MX20 is a great example of how KNOLL Maschinenbau responds flexibly to its customers’ needs to facilitate their manufacturing processes as best possible.
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[...] m Pas, a solid stator made of a specially hardened material is used for this pump. The KNOLL solid stator uses the tried and tested “half-shell system” employed in the production process for the [...]