US 12,049,676 B2Granted

Method for dyeing and/or retanning of leather

AssigneeECCO Sko A/S

InventorsThomas Gogsig, Ilona Francisca Maria Coremans, Stojanka Petrusic

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Abstract

A method for dyeing and/or retanning of leather objects includes providing a leather object. The leather object has been processed by at least a tanning process. The leather object is introduced into a process chamber. The leather object is subjected in the process chamber to a pressurized fluid. The pressure of the pressurized fluid is controlled to reach a supercritical state. The leather object is subjected to a dyeing agent and/or a retanning agent, which dyeing or retanning agent is dissolved and/or transported in the pressurized fluid for at least a predefined period of time while the pressurized fluid is in the supercritical state. The pressure is reduced in the process chamber. The leather object is removed from the process chamber. The pressure reduction is controlled over time.

Claims18

Dependent claims

A method for dyeing and/or retanning of leather objects, said method comprising steps of:

providing a leather object, which leather object has been processed by at least a tanning process,
introducing the leather object into a process chamber,
subjecting the leather object in the process chamber to a pressurized fluid,
controlling a pressure of the pressurized fluid to reach a supercritical state,
subjecting the leather object to a dyeing agent and/or a retanning agent, which dyeing or retanning agent is dissolved and/or transported in the pressurized fluid for at least a predefined period of time while the pressurized fluid is in the supercritical state,
reducing the pressure in the process chamber, and
removing the leather object from the process chamber,
wherein the step of reducing the pressure in the process chamber comprises controlling the pressure reduction over time.

5 more elements

Dependencies are inferred from the claim text.