Provided is a method of producing a wet master batch, including the step of: solid-liquid separating and dehydrating a coagulum slurry obtained by mixing a rubber latex with a carbon black slurry containing a carbon black dispersed in water and coagulating the mixture, the solid-liquid separating and dehydrating step including gravity filtering and vacuum filtering the coagulum slurry on a filtration filter and then pressurizing, by means of a pressurizer, the coagulum slurry on the outer peripheral surface of a drum, to thereby pressure dehydrate the coagulum slurry. Also provided is a solid-liquid separating and dehydrating apparatus for wet master batch production, which includes: a filtration filter; a filtration portion; a drum; and a pressurizer.

Provided is a method of producing a wet master batch, including the step of: solid-liquid separating and dehydrating a coagulum slurry obtained by mixing a rubber latex with a carbon black slurry containing a carbon black dispersed in water and coagulating the mixture, the solid-liquid separating and dehydrating step including gravity filtering and vacuum filtering the coagulum slurry on a filtration filter and then pressurizing, by means of a pressurizer, the coagulum slurry on the outer peripheral surface of a drum, to thereby pressure dehydrate the coagulum slurry. Also provided is a solid-liquid separating and dehydrating apparatus for wet master batch production, which includes: a filtration filter; a filtration portion; a drum; and a pressurizer.

Described herein is a method for cleaning an electrocoating bath in a continuous facility, where a skid connected to a conveying installation is conveyed through the electrocoating bath, and where the skid includes a filter medium; the filter medium is secured on the skid via at least one movable connecting element; the movable connecting element allows the orientation of the filter medium at the interface between electrocoating bath and air; and, after immersion of the skid into the electrocoating bath, during the conveying of the skid through the electrocoating bath, the filter medium is oriented at the interface between electrocoating bath and air and is drawn along the surface of the electrocoating bath. Also described herein is a skid for use in the cleaning method.

Described herein is a method for cleaning an electrocoating bath in a continuous facility, where a skid connected to a conveying installation is conveyed through the electrocoating bath, and where the skid includes a filter medium; the filter medium is secured on the skid via at least one movable connecting element; the movable connecting element allows the orientation of the filter medium at the interface between electrocoating bath and air; and, after immersion of the skid into the electrocoating bath, during the conveying of the skid through the electrocoating bath, the filter medium is oriented at the interface between electrocoating bath and air and is drawn along the surface of the electrocoating bath. Also described herein is a skid for use in the cleaning method.