Manufacturing process of three-dimensional leather objects

Manufacturing process of three-dimensional leather objects, comprising the following steps:

• providing a piece of leather with a flesh side and a grain side;
• applying a hardener additive on the flesh side of the piece of leather;
• wherein said hardener additive is activated at an activation temperature of approximately 40°-50° C.;
• drying of the hardener additive;
• providing a shape with the same shape as a three-dimensional object to be obtained;
• positioning the flesh side of the piece of leather on the shape;
• introducing the shape with the piece of leather inside a vacuum sack in such a way that the vacuum sack generates a membrane applied on the grain side of the piece of leather;
• applying rough vacuum in said vacuum sack in such a way that the flesh side of the piece of leather adheres on 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 vacuum progressively during the heating step, in such a way to progressively compress the piece of leather onto the shape until the 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. in vacuum conditions;
• extracting the shape with the piece of leather from the vacuum sack;
• removing the piece of leather from the shape in such a way that the piece of leather has the shape of a three-dimensional object.