Manufacturing process for a semi-matte decorative part and semi-matte decorative part

The manufacturing process using abrasive powders creates semi-matte decorative parts that resist dirt accumulation, are easy to clean, and provide a unique appearance by reducing specular reflection and enhancing diffuse reflection.

FR3141632B1Active Publication Date: 2026-05-08G & F CHATELAIN SUCCURSALE DE CHANEL SARL
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Patent Information

Application Number
FR2022011512
Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-11-04
Publication Date
2026-05-08
Estimated Expiration
2042-11-04

AI Technical Summary

Technical Problem

Matte decorative parts tend to trap dirt, making them difficult to clean, especially when light-colored, and lack visual differentiation from polished surfaces.

Method used

A manufacturing process involving a tumbling step with abrasive powders like diamond, boron nitride, silicon carbide, or alumina to create a semi-matte finish with controlled surface asymmetry and roughness, reducing specular reflection and enhancing diffuse reflection.

Benefits of technology

The process results in decorative parts that accumulate less dirt, are easier to clean, and offer a distinct silky or velvety appearance compared to matte finishes, with reduced specular reflection and increased diffuse reflection.

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Abstract

The present invention relates to a method for manufacturing a semi-matte decorative part, the method comprising the steps of: - providing a decorative part, this decorative part having a hardness equal to or greater than 800 HV, - placing the decorative part in a drum, the drum comprising an abrasive powder of a material selected from at least one of the following materials: diamond, boron nitride, silicon carbide, alumina and / or boron carbide, - operating the drum for at least 3 hours so that the decorative part is set in motion at an average speed of between 0.5 m / min and 1.5 m / min. The semi-matte decorative part (1) has a silky or velvety appearance with light colors, for example, they can be white. It gets less dirty compared to known matte parts and can be easily cleaned. Figure to be published with the abstract: Figure 2
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