Surface tension - Import export

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Wet media differ greatly as regards safe handling, service life and cost of treatment. Surface tension Degreasing properties Cleaning properties Drying properties Residues Filtration properties Bag filter Cartridge filter Distillation Screen basket filter Settling chamber Micro/Ultrafiltration Filling Stabilising Distilling ReFilling Stock bath Bath treatment/Titration Bath change Disposal

For liquidliquidextraction according to the MixerSettlerprinciple, design acc. to Dr. E. Müller (Lurgi). With screw stirrer for intensive mixing of the phases, especially suited for metallic salt extraction. Pumping capacity and residence times are changed by adjusting the stirrer speed. An additional advantage of the unit is the application for extractions during which reactions of considerable density changes occur. Typical applications for this universal apparatus are metal salt extractions mixtures with low surface tension if the dispersed phase coalesces with difficulty if variation in residence time of the phases occur in the extraction stages if reactions are expected during the extraction process if considerable changes in density are expected as a result of extraction

The effect achieved by the corona treatment is an increase in surface tension to values between 38 to 60 mN/m. Since the surface tension is caused by dispersive and polar interaction components the introduction of polar functional groups in particular increased the polar component of the surface tension.

Measurement of the surface tension The adhesion of a surface is usually directly dependent on the surface energy. If the surface energy is substantially lower than that of the printing ink used, the wetting is disturbed, resulting in poor adhesion. For this reason, plastic surfaces have to be pre-treated. Depending on the type of ink used the surface tension required can vary: solvent based inks => 38 bis 42 mN/m (=Dyn/cm) water soluble inks => 40 bis 44 mN/m UV inks => 44 bis 46 mN/m With the test inks of AFS, which are available from 34 to 56 dyn/cm surface tensions of plastic films can be easily and reproducibly determined according to DIN ISO 8296. Depending on whether the ink sticks or bubbles on the surface it indicated whether the surface tension is above or below the dyne-value of the currently used test ink. We also offer the test inks in a case with 12 bottles from 34 to 56 dyn/cm.