Method for impregnation of a part made of plastic material
AssigneeThe Swatch Group Research and Development Ltd
InventorNicolas Francois
Life of this patent
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Abstract
A method for core impregnation of a finished part made of plastic material with an additive, including: dissolving the additive in a liquid medium to form a solution; placing the plastic part at ambient pressure in a pressure enclosure; hermetically sealing the chamber; impregnating the plastic part with the solution by a fluid at supercritical or near supercritical conditions in the enclosure at a pressure between 3 MPa and 6 MPa, at a temperature between 25° C. and 65° C. for a duration between 1 minute and 15 minutes; releasing the pressure inside the enclosure so that the liquid medium diffuses outside the plastic part and to trap the additive inside the plastic part.
Claims18
A method for core impregnation of a finished part made of plastic material with at least one additive, the method comprising:
- dissolving the at least one additive in a liquid medium to form a solution;
- placing a plastic part at ambient pressure in a pressure enclosure;
- hermetically sealing the chamber;
- impregnating the plastic part with the solution by carbon dioxide in the enclosure at a pressure between 3 MPa and 6 MPa, at a temperature between 40° C. and 65° C. for a duration between 1 minute and 10 minutes;
- releasing the pressure inside the enclosure so that the liquid medium diffuses outside the plastic part and to trap the at least one additive inside the plastic part,
- wherein the plastic part is a watch case, a watch wristband, a watch bezel, a watch crown, a watch dial, a watch push-button, a watch crystal, or a watch loop.
A method for core impregnation of a finished part made of plastic material with at least one additive, the method comprising:
- dissolving the at least one additive in a liquid medium to form a solution, wherein the at least one additive is a hyaluronic acid or ceramide;
- placing a plastic part at ambient pressure in a pressure enclosure;
- hermetically sealing the chamber;
- impregnating the plastic part with the solution by carbon dioxide in the enclosure at a pressure between 3 MPa and 6 MPa, at a temperature between 40° C. and 65° C. for a duration between 1 minute and 10 minutes;
- releasing the pressure inside the enclosure so that the liquid medium diffuses outside the plastic part and to trap the at least one additive inside the plastic part.
Dependencies are inferred from the claim text.