US 11,987,854 B2
Manufacturing process of three-dimensional leather objects
Corrado Luigi Cingolani, Castelfidardo (IT)
Appl. No. 17/599,957
Filed by EGAS CONSULTING SOCIETA' A RESPONSABILITA' LIMITATA SEMPLIFICATA, Castelfidardo (IT)
PCT Filed Apr. 6, 2020, PCT No. PCT/EP2020/059785
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/207977, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 102019000005366 (IT), filed on Apr. 8, 2019.
Prior Publication US 2022/0170121 A1, Jun. 2, 2022
Int. Cl. C14B 1/30 (2006.01); B68F 1/00 (2006.01); C14B 1/44 (2006.01); C14B 1/58 (2006.01); C14C 11/00 (2006.01)
CPC C14B 1/30 (2013.01) [B68F 1/00 (2013.01); C14B 1/44 (2013.01); C14B 1/58 (2013.01); C14C 11/00 (2013.01)] 11 Claims
OG exemplary drawing
 
1. 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.