A COMPOSITE MATERIAL FOR ADDITIVE MANUFACTURING OF A THREE-DIMENSIONAL COMPOSITE PRODUCT

• Main Authors: Nurminen, Ari, Kinnunen, Ari P, Saarikoski, Eve, Kosonen, Harri
• Format: Patent
• Language: English; French; German
• Published: 27.02.2019
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The invention relates to a composite material filament having rheological characteristics suitable for use in additive manufacturing by extrusion, a method for manufacturing a three-dimensional composite product with an additive manufacturing system from a filament of such composite material, and to a three-dimensional composite product obtained by an additive manufacturing system using such composite material. The filament is formed of material comprising semi-crystalline polylactic acid and chemical pulp of wood-based cellulose fibres, wherein the amount of chemical pulp of wood-based cellulose fibres is selected such that sufficient complex viscosity is obtained at melt state, such that upon additive manufacturing by extrusion, composite melt formed of the filament has a ratio of shear storage modulus to shear loss modulus G'/G" equal to or higher than 1.0 at a temperature equal to or higher than 133°C.