Patent EP-2151517-A1 (EP)
Inventor: SEUSS RAINER
IPC: B29C70/20
Filed: 2008-08-07
Abstract: The method for producing unidirectional fiber layer (1) in the form of an endless web, which is present in a transport device moving with constant speed and moves in its longitudinal direction together with the transport device, comprises juxtaposingly placing the fibers (11) in the form of individual segments in a defined position, where each segment consists of fiber that consists of multiple filaments. The segments and the fibers run parallel to each other but below an angle to the longitudinal direction of the developed fiber layer. The width of each segment is measured. The method for producing unidirectional fiber layer (1) in the form of an endless web, which is present in a transport device moving with constant speed and moves in its longitudinal direction together with the transport device, comprises juxtaposingly placing the fibers (11) in the form of individual segments in a defined position, where each segment consists of fiber that consists of multiple filaments. The segments and the fibers run parallel to each other but below an angle to the longitudinal direction of the developed fiber layer. The width of each segment is measured and an embedding speed is determined according to the measured width with which the segment in the developed fiber layer is placed in the targeted defined position to the previously placed segment. The fiber is widened to a strip, which forms a segment. Several strips (12) are placed to each other to a respective segment in a fiber-free manner and/or to the respective segment in the unidirectional fiber layer in a lane-free manner. The fibers are widened to a constant width. Widening devices causing the widening of the individual fibers are varied to each other in a widening direction related to its position, so that the finished widened strips are combined to a lane-free segment after completing the widening process. The strips are overlappingly placed to each other to the segment and/or the segment overlappingly placed to each other in the fiber layer with corresponding distances. The width of the strips or the segments are constantly measured, and are impressed for placing moving components relative to the transport direction for compensating its width variation. Several fibers are widened simultaneously to the strips in separate or common widening units. The width of the strips or the segments is targetedly adjusted to a defined weight per unit area. A size existing on the fibers is thermally or chemically broken before, during or after widening. A transverse cohesion is imparted to the individual strips, the individual segments or the unidirectional fiber layer by chemical binding agent or by mechanical or hydraulic treatment. The strips are regulated to an actual width for reaching a lane-free position or an area-wise stepped overlapping position and/or a position with defined weight per unit area. The width of the strips is directly measured after leaving the widening units or during the widening way, and the strips are supplied to a regulating device for regulating the actual width. The fibers consist of carbon, ceramic, glass and/or aramide or their preproducts and/or intermediate products. Independent claims are included for: (1) a multiaxial wire structure; and (2) a device for producing a unidirectional fiber layer from fibers.