Unidirectionally fiber-reinforced endless winding ply

A method for manufacturing a single-ply semi-finished product web reinforced with unidirectionally orientated continuous fibers, comprising the steps of:

• a) introducing a single-ply initial semi-finished product web which is reinforced with continuous fibers orientated unidirectionally in the movement direction of the initial semi-finished product web and in which the unidirectionally orientated continuous fibers are embedded in a matrix containing at least 60% by weight of one or more thermoplastic polymers selected from the group consisting of polyamide, polyolefin and mixtures thereof, and which exhibits two opposing, parallel peripheral edges spaced apart by the width of the initial semi-finished product web and extending in the movement direction of the initial semi-finished product web, wherein the dispersal of the fibers in the initial semi-finished product web extends over the entire width;
• b) severing parallelogram-shaped segments of the initial semi-finished product web, wherein the segments exhibit two opposing, parallel cutting edges in addition to the two opposing, parallel peripheral edges, wherein one cutting edge exhibits a predetermined angle with respect to the perpendicular of the peripheral edge in the segment, the value β of which is in the range of 0° to less than 90°, where α+β=90°;
• c) positioning one or more of the segments on the semi-finished product web to be lengthened, such that the peripheral edges of the segments are parallel and overlap adjacent segments at the peripheral edges, wherein the overlap is more than 1 to 8 mm, wherein the cutting edges also lie along the movement direction of the semi-finished product web and form the peripheral edges of the new semi-finished product web, and wherein the unidirectionally orientated continuous fibers of the segments enclose a predetermined angle with the movement direction, the value of which is α;
• d) connecting the adjacent segments by ultrasonic welding, forming a welding seam, wherein the welding seam substantially encompasses the region of the overlap of the segments.