Device for the twist-free width change of a fiber strip passing through the device, and system having a plurality of such devices
The invention relates to a device ( 1 ) for the twist-free width change of a fiber strip ( 2 ) of continuous fibers ( 3 ) passing through the device ( 1 ) to a specified effective width ( 8 ). The device ( 1 ) comprises a transport unit ( 4 ) for transporting the fiber strip ( 2 ). The device ( 1 ) further comprises at least one width change assembly ( 5 ) configured such that the width change assembly ( 5 ) transfers an initial distance (a) of two adjacent fibers ( 3 ) of the fiber strip ( 2 ) to a target distance (b) of adjacent fibers ( 3 ) of the fiber strip ( 2 ). For a large part of the pairs of adjacent fibers ( 3 ), the ratio between the target distance (b) and the initial distance (a) matches within a tolerance range of 20%. This results in a reliable and economical device.
1. A device for the twist-free width change of a fiber strip made of a plurality of continuous fibers passing through the device to a predefined width (B), comprising
a transport assembly for transporting the fiber strip,
at least one width change assembly which changes an initial spacing (a) of two adjacent fibers of the fiber strip to a target spacing (b) of adjacent fibers of the fiber strip, the ratio between the target spacing (b) and the initial spacing (a) for all pairs of adjacent fibers matching within a tolerance band of 20%;
wherein the at least one width change assembly has:
a first partially circular guide contour having a first contour radius that is located in an arrangement plane (yz) perpendicular to a transport direction (x) of the fiber strip,
a second partially circular guide contour having a second contour radius which lies in a further arrangement plane (yz) perpendicular to the transport direction (x) of the fiber strip,
the two partially circular guide contours being arranged coaxially,
the fiber strip being guided over the two guide contours such that the individual fibers rest on both guide contours, the two guide contours following each other directly without any interposed guide components.
2. The device as claimed in claim 1 , wherein at least one further width change assembly, which changes an initial spacing (a) of two adjacent fibers of the fiber strip to a target spacing (b) of adjacent fibers of the fiber strip, the ratio between the target spacing (b) and the initial spacing (a) for all the pairs of adjacent fibers matching within a tolerance band of 20%.
3. The device as claimed in claim 1 , wherein the at least one width change assembly has an edge stop for defined guidance of all the edges of the fiber strip.
4. The device as claimed in claim 1 , wherein the fiber strip is passed through a portion of an inner circumference of at least one of the guide contours.
5. The device as claimed in claim 1 , wherein the fiber strip is passed over a portion of an outer circumference of at least one of the guide contours.
6. The device as claimed in claim 1 , wherein the device has a top and a bottom, and wherein the fiber strip is guided between components located at the top and components located at the bottom, wherein at least some of the components located at the top have an operating position and a release position, in which the fiber strip is accessible from above.
7. The device as claimed in claim 1 , comprising a heating unit for heating the fiber strip before entry into the at least one width change assembly.
8. A system comprising a plurality of devices as claimed in claim 1 to produce a combined overall fiber strip made of a plurality of fiber strips arranged beside one another.
9. The system as claimed in claim 8 , wherein at least sections of the devices transport the fiber strips on different working planes.