Knotter

a continuous-action device for the preliminary removal of knots, incompletely processed chips, fiber bunches, and various large bodies from paper pulp. In a centrifugal knotter the cellulose fibers are passed through holes in a cylindrical sieve by means of the static pressure of the pulp and the centrifugal force resulting from the rotation of a rotor blade in the sieve. Vibration knotters consist of a trough with a perforated bottom, suspended in a reinforced-concrete basin. The sorted pulp passes through the holes of a sieve into the basin. Vibration transports knots and unprocessed chips along the trough; they are then washed away from the good fiber when the trough is removed from the apparatus. The water suspension used in the knotter contains 0.8–2.5 percent pulp by weight. The diameter of the holes in the sieve is 4–9 mm, and the total area of the sieve is up to 2 m². Knotters can process up to 250 tons of pulp per day.

a device for removing knots, clumps of fibers, poorly crushed particles, and other inclusions in paper pulp before the pulp is fed to a paper machine. The pulp is cleaned in the knotter as it passes through slits in rotating drums or through holes in sieves. The productivity of knotters reaches 170–230 tons per day for air-dry fiber.

in textile production, a hand device or machine mechanism designed to tie knots in yarn ends when fixing breaks in the yarn or connecting yarns from two packs. A hand knotter makes the process of tying knots easier and reduces the time required for tying ends to 1 sec. The most commonly used type in the USSR was designed by M. V. Bashkirov and resembles a latch needle used in machine knitting. It has a base by which it is secured to each working position on a winder. Knotter mechanisms that automatically tie a knot and cut off the ends are the principal working part in knotting machines. They are capable of tying a knot in 0.15–0.25 sec.