Woven sieve textile used by Schwegmann consist of smooth and steady (monofile) threads, which are thermofixed and therefore able to keep their typical corrugated form, even under pressure. This means that the threads stay in their position during filtration, which guarantees an definable mesh size.
However, this effect can be influenced by different factors:
It could also be possible, that gelatinous particles change their shape and thereby pass a smaller mesh opening.
Furthermore the "open filter area" influences the filtration result to be achieved with a sieve textile. The open filter area defines the extent to which the filter area consists of mesh openings (in ratio to the threads of the sieve textile).
The open filter area differs a lot with regard to the different mesh openings of sieve textiles, depending on the thread diameter: while a textile with a mesh opening of 1000 µm can have an open filter area of 59% - a 25 µm - textile will have an open filter area of only about 19%, since the thread diameter is not reduced proportionally to the mesh opening. The thread would be to thin, the textile would not be stable enough.
Despite of the afore mentioned influences on filtration results, these sieve textiles offer high removal efficiencies and highly reproducible filtration results.
Mesh opening of sieve textile as well as size of particles are indicated in µm (1000 µm = 1 mm).
The materials mainly used are polyamid, polyester and polypropylene. These materials differ with regards to their resistance against chemicals and temperatures.