A method of manufacturing a thread comprising bamboo fibers, the method comprising:
- supplying bamboo parts to a bamboo part splitting device, and splitting flat pieces from the bamboo parts with a bamboo part splitting device comprising:
- at least a first rotary member and a second rotary member for guiding the bamboo parts between them, and
- at least one splitting edge positioned downstream from the first and second rotary member for splitting the flat pieces of bamboo from the bamboo parts,
- wherein the flat pieces have a thickness (T) of less than 2.5 mm;
- splitting the flat pieces with a flat piece splitting device comprising:
- a first rotary element configured for rotation about a first axis, and
- a second rotary element configured for rotation about a second axis, the first and second axes being parallel,
- wherein the flat pieces are split from the bamboo parts by the bamboo part splitting device in a first direction and are subsequently split into elongate bamboo fibers by the flat piece splitting device in a second direction which is orthogonal to the first direction;
- flattening the bamboo fibers with a flattening device comprising two rollers, at least one of which is driven, wherein the bamboo fibers are guided between the rollers and flattened by the rollers, and wherein the flattening contributes to opening and separating the split bamboo fibers;
- cleaning the bamboo fibers with a cleaning device, wherein the cleaning is performed after the flattening, wherein the cleaning comprises removing parenchyma which is attached to the bamboo fibers, and wherein the cleaning comprises combing the bamboo fibers and/or frictionally engaging the bamboo fibers with rotary cleaning members having a circumferential surface;
- wherein the splitting, flattening and cleaning results in elongate bamboo fibers having a width (W) of less than 2.5 mm and a cross-sectional area of between 0.005 and 0.1 mm2,
- the method further comprising:
- arranging the bamboo fibers into an elongate strand of bamboo fibers,
- wherein the formed strand has a cross-sectional area of 0.1-100 mm2, and
- wherein each cross section of the strand comprises multiple bamboo fibers, wherein in each cross section of the strand a plurality of bamboo fibers are staggered in a longitudinal direction of the strand relative to a plurality of other bamboo fibers in said cross section, and wherein at least 30 percent of the bamboo fibers are not braided or twisted;
- and
- interconnecting the bamboo fibers into a thread by:
- providing a web around the strand, wherein the web has an open structure and comprises multiple openings, and/or
- applying a coating or resin onto the bamboo fibers, and/or
- winding a binding thread around the strand,
- and wherein the thread is formed as an endless thread in a continuous process.