Manufacturing process of three-dimensional leather objects

A process for manufacturing a three-dimensional leather object, the process comprising:

• providing a piece of leather, the piece of leather having a flesh side and a grain side;
• applying a hardener additive onto the flesh side of the piece of leather, wherein the hardener additive is activated at an activation temperature of approximately 40° C. to 50° C., wherein the hardener additive comprises thiophene, sodium diocytl sulphosuccinate, alcohols, fatty alcohols C12-C18 that are even numbered and ethoxylates;
• drying the hardener additive;
• providing a shape matching a shape of the three-dimensional leather object;
• positioning the flesh side of the piece of leather on the provided shape;
• introducing the shape of the piece of leather inside a vacuum sack such that the vacuum sack generates a membrane applied on the grain side of the piece of leather;
• applying a rough vacuum in the vacuum sack such that the flesh side of the piece of leather adheres onto the shape;
• heating the vacuum sack with the shape and the piece of leather until the piece of leather reaches the activation temperature of the hardener additive;
• applying the vacuum progressively during the step of heating so as to progressively compress the piece of leather onto the shape until a desired shape is obtained;
• cooling the vacuum sack with the shape and the piece of leather until the piece of leather reaches a temperature of approximately 25° C. under vacuum conditions;
• extracting the shape with the piece of leather from the vacuum sack;
• and
• removing the piece of leather from the shape such that the piece of leather has a shape of the three-dimensional leather object.