Textiles: fiber preparation – Working – Carding
Patent
1979-12-11
1983-05-24
Rimrodt, Louis
Textiles: fiber preparation
Working
Carding
19105, 19106R, 19300, D01G 1512
Patent
active
043843883
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a method of controlling the working conditions between two rotating cylinders, which are equipped with a point clothing, and on the cylindrical surface of which a fiber web is processed or mutually transferred, and which cooperate at a small mutual distance between the cylindrical surfaces at the web processing or web transfer points, of a processing machine of the staple fiber spinning plant, and apparatus for implementing the method.
In staple fiber spinning, particularly in the first stages of the process leading to the yarn formation, the problem arises to bring progressive order into the random arrangement of fibers as it prevails in the bales and at the same time to eliminate the impurities contained in the raw material. This problem is solved using fiber processing machines of the type described above, in which the fibers in the form of a thin fiber web are transferred from a first cylinder equipped with a clothing to a second cylinder which also is equipped with a clothing, or in which the fibers of the fiber web are subject to a combing process between the surfaces of two cylinders equipped with a clothing, which move relative to each other, by the points of the clothing without transfer of fibers from one cylinder to the other. Typical examples of such fiber processing stages are found e.g. on the card, where e.g. between the taker-in or licker-in roll and the main cylinder, or between the main cylinder and the doffer respectively, an almost complete transfer of the fibers from one cylinder to the other is effected, whereas between the main cylinder and the flats a combing action, also called carding action is effected without transfer of the fibers. The transfer of the fibers between two cylinders as well as the carding action depend substantially on the working conditions between the two cylinders involved, the distance between the cylinder surfaces at the transfer point, or at the processing point respectively, exerting a decisive influence (besides other factors, such as e.g. the type of the clothing points or the surface speed). Experience has shown that the transfer of the fibers as well as the carding action is better, the smaller the distance defined above is. Thus one tries to keep said distance as narrow as possible, namely in the range of 1/10 mm.
The term cylinder in this context is understood to designate a substantially cylindrical surface equipped with a point clothing, independently of whether said surface is convex or concave, and whether the cylindrical surface extends over the full circle or over only a part thereof, and whether the surface consists of one rigid body or of a number of elements connected in chain-like fashion, such as the group of flats of a revolving flat card.
The term distance between two cylinders equipped with a point clothing in this context is understood to designate always the distance or clearance at the closest point between the points of the clothing, which can be determined e.g. by inserting a feeler gauge between the clothings.
For increasing the production rate of the processing machines in question two approaches were chosen: on one hand, the rotational speed of the processing elements was increased, and on the other hand, the dimensions of the cylinders of the machine, namely the diameter as well as the working width, were increased. Fulfillment of both measures, however, implies compromises concerning the quality of the working conditions of the machine, as caused by the increased rotational speed and by the increased dimensions the undesirable deformation of the cylinders, i.e. their bulging, caused by the centrifugal force, is increased progressively. A further influence connected with the increase of the production rate and, thus of the carding action directly, is the influence of the heat expansion of the cylinders involved, the present trend of suppressing to a large extent the air exchange between the cylinders and the surrounding room, for preventing dust emissions, impeding the natural cooling of the workin
REFERENCES:
patent: 1550391 (1925-08-01), Platt
patent: 4100650 (1978-07-01), Wirth et al.
Rieter Machine Works Ltd.
Rimrodt Louis
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