A warp yarn take-up system includes a clamping device for holding a plurality of layers of warp yarns, the clamping device being movable at least in a direction corresponding to the advance direction of the warp yarns. The clamping device includes a bottom clamp, a top clamp, and at least one intermediate clamping element present between the bottom clamp and the top clamp. The bottom clamp, the top clamp, and the at least one intermediate clamping element are held together by clamping.

An installation for fabricating a fiber texture in the form of a strip presenting a profile that varies at least in cross-section includes a loom, one or more take-up rollers, and a storage mandrel, each take-up roller and the storage mandrel presenting a radius that varies across its axial width so as to define an outer surface having a profile in relief. One or more take-up rollers include a plurality of sectors releasably fastened on the outer surface of the take-up roller. Each sector extends over a fraction of the circumference of the take-up roller and over all or part of the axial width of the take-up roller. Each sector also presents at least one thickness that is determined in such a manner as to modify locally the thickness of the profile in relief of the outer surface of the take-up roller.

An installation for fabricating a fiber texture in the form of a strip presenting a profile that varies at least in cross-section includes a loom, one or more take-up rollers, and a storage mandrel, each take-up roller and the storage mandrel presenting a radius that varies across its axial width so as to define an outer surface having a profile in relief. One or more take-up rollers include a plurality of sectors releasably fastened on the outer surface of the take-up roller. Each sector extends over a fraction of the circumference of the take-up roller and over all or part of the axial width of the take-up roller. Each sector also presents at least one thickness that is determined in such a manner as to modify locally the thickness of the profile in relief of the outer surface of the take-up roller.

A three dimensional woven preform, a fiber reinforced composite incorporating the preform, and methods of making thereof are disclosed. The woven preform includes one or more layers of a warp steered fabric. A portion of the warp steered fabric is compressed into a mold to form an upstanding leg. The preform includes the upstanding leg and a joggle in a body portion. The body portion and upstanding leg are integrally woven so there is continuous fiber across the preform. A portion of the warp steered fabric includes stretch broken carbon fibers in the warp direction, and another portion includes conventional carbon fibers. The warp steered fabric can be woven on a loom equipped with a differential take-up mechanism. The warp steered fabric can be a single or multilayer fabric. The preform or the composite can be a portion of an aircraft window frame.

A three dimensional woven preform, a fiber reinforced composite incorporating the preform, and methods of making thereof are disclosed. The woven preform includes one or more layers of a warp steered fabric. A portion of the warp steered fabric is compressed into a mold to form an upstanding leg. The preform includes the upstanding leg and a joggle in a body portion. The body portion and upstanding leg are integrally woven so there is continuous fiber across the preform. A portion of the warp steered fabric includes stretch broken carbon fibers in the warp direction, and another portion includes conventional carbon fibers. The warp steered fabric can be woven on a loom equipped with a differential take-up mechanism. The warp steered fabric can be a single or multilayer fabric. The preform or the composite can be a portion of an aircraft window frame.

Method and apparatus for producing and drawing-off a web-shaped product (2) with a production machine (1) and two clamp carriers (7.1, 7.2) with clamps (10.1, 10.2). The clamp carriers (7.1, 7.2) are driven moving back and forth parallel to a drawing-off direction of the web-shaped product (2). The clamp carriers (7.1, 7.2) are respectively drivable with a pair of drive spindles (14.1, 14.2), which are arranged in such a manner so that the web center of the web-shaped product (2) within the apparatus (6) extends in an area between the two drive spindles (14.1, 14.2) of the respective clamp carrier (7.1, 7.2). The method is characterized in that the web-shaped product (2) is produced with successive main sections (4.1, 4.2, 4.3, 4.4) and auxiliary sections (3.1, 3.2, 3.3, 3.4, 3.5), and that the clamps (10) are actuated in such a manner so that the opening and closing of the clamps (10) takes place only in the time segments of the production in which an auxiliary section (3.1, 3.2, 3.3, 3.4, 3.5) of the web-shaped product (2) is being produced.

Method and apparatus for producing and drawing-off a web-shaped product (2) with a production machine (1) and two clamp carriers (7.1, 7.2) with clamps (10.1, 10.2). The clamp carriers (7.1, 7.2) are driven moving back and forth parallel to a drawing-off direction of the web-shaped product (2). The clamp carriers (7.1, 7.2) are respectively drivable with a pair of drive spindles (14.1, 14.2), which are arranged in such a manner so that the web center of the web-shaped product (2) within the apparatus (6) extends in an area between the two drive spindles (14.1, 14.2) of the respective clamp carrier (7.1, 7.2). The method is characterized in that the web-shaped product (2) is produced with successive main sections (4.1, 4.2, 4.3, 4.4) and auxiliary sections (3.1, 3.2, 3.3, 3.4, 3.5), and that the clamps (10) are actuated in such a manner so that the opening and closing of the clamps (10) takes place only in the time segments of the production in which an auxiliary section (3.1, 3.2, 3.3, 3.4, 3.5) of the web-shaped product (2) is being produced.

Three-dimensional woven preforms are curved and have continuous fibers in the direction of curvature and wherein the base of the preforms is curved with the warp fibers continuous across the length of the preform and some of the warp fibers are longer than other warp fibers.

Three-dimensional woven preforms are curved and have continuous fibers in the direction of curvature and wherein the base of the preforms is curved with the warp fibers continuous across the length of the preform and some of the warp fibers are longer than other warp fibers.

A method for manufacturing a preform for a turbomachine component with a weaving installation including at least a first delivery roll and a storage roll. The method includes the following steps: feeding the weaving installation with weft and warp filaments, weaving the weft and warp filaments together to form the preform, driving the preform in a direction of travel towards the storage roll, applying a predetermined tension on the preform, winding the preform onto and storing it on the storage roll. The method also includes a step of immobilizing the preform on the first delivery roll positioned upstream of the storage roll in the direction of travel of the preform.