US 12,403,634 B2
Method for obtaining an object through the use of machine tools
Fabio Salvadori, Casciana Terme Lari (IT)
Assigned to ALFA HOLDING DI ANNARITA CAPONI E C. S.A.S., Pisa (IT)
Appl. No. 17/251,459
Filed by Fabio Salvadori, Casciana Terme Lari (IT)
PCT Filed Jun. 25, 2019, PCT No. PCT/IB2019/055335
§ 371(c)(1), (2) Date Dec. 11, 2020,
PCT Pub. No. WO2020/003116, PCT Pub. Date Jan. 2, 2020.
Claims priority of application No. 102018000006777 (IT), filed on Jun. 28, 2018.
Prior Publication US 2021/0252749 A1, Aug. 19, 2021
Int. Cl. B05D 3/00 (2006.01); B29C 41/08 (2006.01); B29C 41/22 (2006.01); B29C 44/36 (2006.01); B29K 25/00 (2006.01); B29K 75/00 (2006.01)
CPC B29C 41/08 (2013.01) [B29C 41/22 (2013.01); B29C 44/367 (2013.01); B05D 3/00 (2013.01); B29K 2025/06 (2013.01); B29K 2075/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for obtaining an object comprising the steps of:
producing a base structure of the object;
creating a compact rigid shell onto at least a part of said base structure said compact rigid shell conferring predetermined structural features to said base structure, said compact rigid shell obtained by spraying a first polyurethane material onto at least a part of said base structures;
providing a coating by spraying onto said at least part of said rigid shell, a second type of polyurethane material, said second type of polyurethane material being an expanded polyurethane material which forms an external layer overlapping said rigid shell, said external layer being produced with an increased thickness; and
subsequently machining, said external layer of expanded polyurethane material using a machine tool so as to remove said increased thickness and to bring the object to a final size.