Abstract: A fiber opening device for use in a discontinuous spinning process. The opening device includes an opening roller rotatably mounted about an axis and having a cylindrical working surface which extends around the axis. Opening elements are provided around the working surface. A space is defined between an axially outermost fiber opening element and an adjacent outer edge of the cylindrical working surface. A pressure reduction opening is provided for reducing pressure in or around that space. The pressure reduction opening is arranged to urge fibers into engagement with the working surface.

Abstract: The invention relates to opening rollers for open-end spinning apparatus, particularly of the type in which there is a roller body on which is wound a helical coil of metallic wire type card-clothing.The card-clothing coil is located between a pair of abutments, each of which has an annular inner end face in the shape of a helix with an acclivity or step between its maximum and minimum axial displacements, this annular face being complementary in shape to the adjacent end of the card-clothing coil, so that when the ends of the coil are engaged with their respective abutments, there are no recesses between the roller body and the ends of the coil in which lint can lodge.The abutments can be formed by separate distance pieces, or by forming integrally with the roller body, or by moulding after the card-clothing coil has been applied to the roller body.It is preferred to use interlocking type card-clothing wire.