Method and device for producing a fiber-reinforced semi-finished plate by ultrasonic welding

A process for producing a fiber-reinforced semifinished panel comprising the following operations:

• (1) unrolling two or more unidirectionally fiber-reinforced semifinished products from rolls;
• (2) joining the two or more unidirectionally fiber-reinforced semifinished products to afford a fiber-reinforced semifinished panel sheeting by ultrasonic welding;
• (3) cutting the fiber-reinforced semifinished panel from the fiber-reinforced semifinished panel sheeting,
• wherein the two or more unidirectionally fiber-reinforced semifinished products are face to face superposed and are inseparably conjoined by ultrasonic welding;
• wherein the two or more unidirectionally fiber-reinforced semifinished products are conjoined to an extent of more than 99%, based on the surfaces with which they face each other;
• wherein the process is performed continuously;
• and
• wherein the alignment of the fibers of at least one of the two or more unidirectionally fiber-reinforced semifinished products is distinct from the alignment of the fibers of the other unidirectionally fiber-reinforced semifinished product or products.