Multi-layer thermoplastic fibre-matrix semi-finished product

• Main Authors: NICKEL, STEFANIE DR, JOACHIMI, DETLEV DR, MARGRAF, GUENTER DR
• Format: Patent
• Language: English; French; German
• Published: 16.10.2013
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

Semi-finished flat product comprises (A) a core with a layer thickness of 0.3-5 mm, which is made of a continuously endless fibers-reinforced or long fibers-reinforced thermoplastic composite material, and is connected over the entire surface on upper- and/or lower side, with (b) at least one layer of a thermoformable thermoplastic molding composition, having a layer thickness of 0.1-3 mm. The core comprises 0.001-80 wt.% at least one reinforcing fiber having a fiber diameter of 3-40 mu m. The core with the layer of the molding composition, is constructed multilayered in a sandwich manner. Semi-finished flat product comprises (A) a core with a layer thickness of 0.3-5 mm, which is made of a continuously endless fibers-reinforced or long fibers-reinforced thermoplastic composite material, and is connected over the entire surface on upper- and/or lower side, with (b) at least one layer of a thermoformable thermoplastic molding composition, having a layer thickness of 0.1-3 mm, a comparable melting point as the matrix of the fiber-reinforced thermoplastic composite material or higher melting point, and a melt viscosity, which is greater by at least 10%, measured according to ISO 11443 at a residual moisture content of less than 0.03% and a molding temperature within shear rate of 1-100/s. The core comprises 0.001-80 wt.% at least one reinforcing fiber exhibiting a fiber diameter of 3-40 mu m. The core with the layer of the molding composition, is constructed multilayered in a sandwich manner. The molding temperature at the beginning of deformation, is at least 3[deg] C greater than the melting point of the material for the core and not > 10[deg] C greater than the melting point of the material of the layer of the thermoplastic molding composition. Die Erfindung betrifft mehrschichtige thermoplastische in Sandwich-Bauweise aufgebaute Plattenhalbzeuge enthaltend einen Kern (A) aus kontinuierlich endlos faserverstärkten thermoplastischen Verbundwerkstoffen oder aus langfaserverstärkten thermoplastischen Verbundwerkstoffen der ganzflächig an Ober- und/oder Unterseite mit wenigstens einer Schicht einer thermoformbaren thermoplastischen Formmasse (B) verbunden ist, welche einen vergleichbaren oder höheren Schmelzpunkt als die Matrix des faserverstärkten thermoplastischen Verbundwerkstoffes im Kern besitzt und bei der Umformtemperatur im Bereich der Scherraten von 1/s - 100/s eine mindestens um 10% höhere Schmelzviskosität gemessen nach ISO 11443 bei Restfeuchtegehalt < 0,03% aufweist wobei der Kern (A) mindestens eine Verstärkungsfaser enthält sowie deren Verwendung in mechanisch belasteten Bauteilen, bevorzugt in Kraftfahrzeugen, Flugzeugen oder Windenergieanlagen.