Fused deposition modeling-based additive manufacturing process at low temperatures

US11440242B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Dirk Achten · Leverkusen, DE
• Thomas Büsgen · Leverkusen, DE
• Dirk Dijkstra · Odenthal, DE
• Nicolas Degiorgio · Krefeld, DE
• Roland Wagner · Feldkirchen-Westerham, DE
• Levent Akbas · Witten, DE
• Peter Reichert · Thousand Oaks, US
• Jörg Büchner · Bensberg, DE

Key dates

• Filing date: Sep 11, 2017
• Grant date: Sep 13, 2022
• Expiry date: Mar 24, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2995/007
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for manufacturing an article comprises the steps of: I) applying a filament of an at least partially fused construction material to a support so as to obtain a layer of the construction material which corresponds to a first selected cross-section of the article; II) applying a filament of the at least partially fused construction material to a previously applied layer of the construction material so as to obtain a further layer of the construction material which corresponds to a further selected cross-section of the article and which is bonded to the previously applied layer; and III) repeating step II) until the article is formed. At least steps II) and III) are carried out in a chamber and the construction material comprises a fusible polymer. The fusible polymer has a fusion range (DSC, differential scanning calorimetry; 2nd heating at a heating rate of 5 K/min.) of ≥20° C. to ≤100° C. The fusible polymer further has a complex viscosity |η*| (determined by viscosity measurement in the melt using a plate-plate oscillating viscometer according to ISO 6721-10 at 100° C. and a shear rate of l/s) of ≥10 Pas to ≤1000000 Pas. Finally, the temperature inside the chamber is ≤50…