Bath Tank

The bath tank is the central component of a deliming bath system used in leather processing. It serves as the containment vessel where hides are immersed in deliming solutions to neutralize lime and prepare the material for subsequent tanning stages. The tank must withstand corrosive chemicals while maintaining precise temperature and chemical concentration levels throughout the processing cycle. Constructed from materials such as stainless steel 316L, fiberglass reinforced plastic, or polypropylene, the tank is designed for durability and chemical resistance. Typical specifications include a nominal capacity of 5000–20000 liters, a working temperature range of 20–40°C, and a pH range of 7–9. Agitation speeds of 10–30 rpm ensure uniform chemical distribution. The tank's wall thickness ranges from 6–12 mm, and it may be designed for a maximum operating pressure of 0.1–0.3 MPa with a leakage rate of ≤0.1 mL/min. Internal surface finish is specified at 0.4–0.8 μm Ra to prevent bacterial growth and facilitate cleaning. Overall dimensions are customizable, typically 3000–6000 mm in length, 1500–2500 mm in width, and 1500–2500 mm in height, with an empty weight of 1500–5000 kg. The agitator drive motor may require electrical power of 5.5–22 kW, and the tank's ingress protection rating is IP54–IP65. These values are reference ranges and must be verified for the specific model and application. The bath tank operates by containing deliming solutions, typically ammonium salts or acids, that chemically react with lime residues in hides. It facilitates controlled immersion, agitation, and drainage processes, ensuring uniform treatment of leather materials while preventing contamination and maintaining solution integrity. Proper selection of the bath tank involves considering the required capacity, material compatibility, and process parameters. Verification questions should address the actual working volume, temperature control accuracy, and compliance with relevant standards such as ASTM A240 for material grade, and leakage, ISO 4287 for surface finish, IEC 60034 for motor power, and IEC 60529 for ingress protection. Maintenance signals include signs of corrosion, leakage, or surface degradation. Failure boundaries include structural failure under excessive pressure or temperature, and loss of chemical containment. Always confirm model-specific values and standards with the legal manufacturer or supplier.

The bath tank operates by containing deliming solutions (typically ammonium salts or acids) that chemically react with lime residues in hides. The tank facilitates controlled immersion, agitation, and drainage processes, ensuring uniform treatment of leather materials while preventing contamination and maintaining solution integrity. Agitation at 10–30 rpm promotes even chemical distribution, while temperature control within 20–40°C and pH maintenance at 7–9 optimize enzyme activity. The tank's design allows for efficient loading and unloading of hides, and its corrosion-resistant materials ensure long-term durability.