Methods and apparatus for coating fibers
Frame for use in coating a reinforcing fiber are provided. The frame includes a first frame end having a first cross-sectional shape. The first cross-sectional shape has one or more contact locations that are spaced apart from each other. The reinforcing fiber contacts the first frame end at the one or more contact locations. Methods are also provided for coating such a fiber.
1 . A frame for use in coating a reinforcing fiber, the frame comprising:
a first frame end having a first cross-sectional shape, wherein the first cross-sectional shape includes one or more contact locations that are spaced apart from each other, and wherein the reinforcing fiber contacts the first frame end at the one or more contact locations, and wherein at least a portion of the reinforcing fiber is spaced apart from the first frame end via support from the one or more contact locations where the portion wraps around the first frame end.
2 . The frame of claim 1 , further comprising:
a second frame end opposite the first frame end, wherein the second frame end has a second cross-sectional shape, wherein the second cross-sectional shape includes one or more contact locations that are spaced apart from each other, and wherein the reinforcing fiber contacts the second frame end at the one or more contact locations.
3 . The frame of claim 2 , wherein the second cross-sectional shape is the same as the first cross-sectional shape.
4 . The frame of claim 1 , wherein the first frame end includes a first contact location spaced apart from an adjacent second contact location by a separation length, wherein a first length is defined by the first contact location, wherein the first length is less than the separation length.
5 . The frame of claim 1 , wherein each contact locations define a point contact between the first frame end and the reinforcing fiber.
6 . The frame of claim 1 , wherein the first frame end is static relative to the frame.
7 . The frame of claim 1 , wherein the frame end is moveable relative to the frame.
8 . The frame of claim 1 , wherein the one or more contact locations are a plurality of contact locations, and wherein the plurality of contact locations has a periodicity factor of at least 2.
9 . The frame of claim 1 , wherein the first cross-sectional shape is a duckbill shape, wherein the duckbill shape comprises a first contact location of the one or more contact locations and a second contact location of the one or more contact locations, wherein the duckbill shape is undercut adjacent each of the first contact location and the second contact location, and wherein the first contact location and the second contact location are separated by a generally V-shaped slot.
10 . The frame of claim 1 , wherein the first cross-sectional shape is an opened mouth shape, wherein the opened mouth shape comprises a first contact location of the one or more contact locations and a second contact location of the one or more contact locations, the first contact location and the second contact location separated by a generally V-shaped slot, and wherein the opened mouth shape comprises a rounded edge adjacent each of the first contact location and the second contact location and opposite the generally V-shaped slot.
11 . The frame of claim 1 , wherein the first cross-sectional shape is a tooth shape, wherein the tooth shape comprises a first contact location of the one or more contact locations, a second contact location of the one or more contact locations, and a midline defined between the first contact location and the second contact location, and wherein the tooth shape further comprises a first linear edge adjacent the first contact location and a second linear edge adjacent the second contact location, each of the first linear edge and the second linear edge extending inward toward the midline at a non-zero angle less than 90°.
12 . The frame of claim 1 , wherein the first cross-sectional shape is a ribbed shape, and wherein the ribbed shape comprises a plurality of ribs, each rib of the plurality of ribs defining a contact location of the one or more contact locations.
13 . The frame of claim 1 , wherein the first cross-sectional shape is a fluted shape, and wherein the fluted shape comprises a plurality of semicircular protrusions, each semicircular protrusion of the plurality of semicircular protrusions defining a contact location of the one or more contact locations.
14 . The frame of claim 1 , wherein the first cross-sectional shape is a finned shape, and wherein the finned shape comprises a plurality of fins, each fin of the plurality of fins defining a contact location of the one or more contact locations.