Патент USA US2407109код для вставки
Sept. 3, 1946. I ‘ - R. A. SMITH‘ ’ 2,407,109 PRODUCTIVON 0F STAPLE FIBER Filed July 18, 1942 INVENTOR. ‘ Pusan?- H SM/TH BY ' ' M774” ’ / ATTORNEo/Va Patented Sept. 3, ‘1946 2,407,109 “ UNITED STATES PATENT‘ OFFICE Robert A. Smith, Ridley Park,_Pa., assignor to American Viscose Corporation, Wilmington, Del., a corporation of Delaware 1 Application .luly 18, 1942, Serial No. 451,486 9 Claims.‘ (01. 19-66)‘ 2 This invention relates to the production of sta ple ?bers of rayon and other synthetic ?lamen tary material and is particularly concerned with a process and apparatus for treating staple ?ber during its manufacture to facilitate its subse quent processing and to improve its ultimate of the invention, associated with a staple cutter, and Figure 4 is an elevation of the embodiment of Figure 3. Figures 1 and 2 show one form of apparatus adapted to accomplish the invention. As there characteristics. - shown, an upright obstruction 2 having a ser rated surface 3 is arranged to receive clumps 4 In many procedures for cutting continuous ?la of staple ?bers thrown thereagainst. Any form mentary material to staple ?bers, a continuous ?lamentary material proceeds to the cutting de 10 of device may be employed to throw the clumps vice as a heavy bundle such as in the form of of staple ?bers against the obstruction, but, as shown, there is employed a form of‘staple ?ber a rope or tow of approximately circular, elliptical, cutter which normally throws the clumps of or rectangular cross-section, frequently contain ?bers cut therefrom at a fairly high velocity. ing many thousands of ?laments and this bun dle is then cut to discontinuous lengths thereby 15 This cutter comprises a rotating disc 5 having forming numerous individual bunches or clumps an axial feed channel‘ 6 communicating with a radial channel ‘I which opens into the periphery of ?bers- These clumps then proceed either to of the disc, the continuous ?lamentary, material opening, carding, spinning and like processes or in the form of a tow being fed into the axial to subsequent stages of treatment, such as wash ing, bleaching, and then to the opening and other 20 channel and being delivered by centrifugal force‘ developed by rotation of the disc or by a, fluid stages, depending upon their condition at the time of cutting. jet, such as of water or air, directed into the axial channel so that the tow extends from the In accordance with this invention, the ?ber periphery of the disc and is brought by rotation clumps are subjected to an opening effected by throwing them against an obstruction presenting 25 of the disc into cutting relationship with a sta tionary knife 8 (or a plurality thereof positioned an indented surface composed ‘of corrugations, about the periphery of the disc). The serrated serrations, notches and the like. The impact surface 3 of the obstruction is arranged in the splatters the clump across or along the surface path oftravel of. the ?ber clumps 4 thrown from and the indentations assist the action by intro ducing offset points of impingement of the clump 30 the disc 5 so that they are impacted thereupon and splatter across the surface thereof. This against the obstruction. By carrying out the splattering is accentuated by the indentations of procedure of the invention while the ?ber clumps are in a wet condition such that the ?bers are the surface so that considerable ~~opening is ac complished thereby. The tow of continuous ?la in a somewhat softened or plastic condition, there is obtained the additional desirable characteris 35 mentary material may be in a plastic condition at the time of cutting so that the serrated sur tic of crimpiness simultaneously with the open face 3 accomplishes a certain amount of crimp? ing operation so that a subsequent separate step ing simultaneously with the opening of the of crimping is unnecessary to better adapt such clumps. When the ?ber product is in a plastic staple ?bers for subsequent textile processes, such 40 condition, it may be desirable to assist its removal as in carding and spinning. ‘ from the surface 3, which ordinarily would occur The opening treatment in accordance with the readily and rapidly by gravity, by means of a invention whether performed under conditions ?uid jet 9 which is shown above the indented favoring crimping or not may advantageously be surface of the obstruction with a long ori?ce associated directly with the cutting operation by adapted to sweep the entire surface. A duct II] arranging the indented surface obstruction in the is arranged beneath the obstruction 2 so that it path of discharge of the cut ?ber clumps from may receive the opened clumps discharged from a cutter of the Beria type applying a rotatable the indented surface. member for delivering the ‘continuous ?lamen tary tow to the cutting element by centrifugal force. In this arrangement, crimping is obtained along with the opening provided the tow is in a wet or somewhat plastic ‘condition at the time of treatment. Figures 3 and 4 show a modi?ed arrangement 1 in which the obstruction is provided with an in verted stepped surface l2 on which the surfaces of the‘steps are arranged substantially parallel to the plane of rotation of the radial channel 1 of the disc 5 of a staple ?ber cutter such as that In the drawing, illustrative of the invention,’ 55 shown in Figures 1 and 2. Since the ?ber clumps‘ Figure 1 is a plan view of one embodiment of the 4 have a high velocity when they strike the invention, associated with a staple ?ber cutter, stepped under surface [2 of the obstruction l I, Figure 2 is an elevation of the embodiment of the various steps shear off portions of the ?ber Figure 1, bundles or clumps. As in the embodiment of Figure 3 is a plan view of a second embodiment 60 Figures 1 and 2, carrying out the invention with 2,407,109 3 4 ?ber clumps which are in a wet or somewhat ing, crimping or the like, an obstruction having anvindented surface and means, for impelling a clump of textile ?bers of spinnable length at high velocity in free ?ight against said surface, said obstruction having a pitch distance'facing the softened condition also gives rise’ to crimping since the ?ber clump ordinarily strikes the steps at an angle. A suitable conveyor, here shown as a conveyor belt [3, is disposed beneath the ob-_ _ struction I l to receive the opened staple and transfers it to the next point of operation. If de sired, a jet of ?uid may be arranged to cooperate clump in its ?ight less than the effective dimen sion of the clump parallel thereto. 2. In a devicev adapted to subject ?bers to open with the obstruction in a manner similar tothat in Figures 1 and 2. e ing, crimping or the like, an obstruction having 10 a grooved surface. and means for impelling a The indented surface of the obstruction may be clump of textile ?bers of spinnable length at high arranged at various angles other than those shown in the drawing. Such variation yields somewhat distinct opening characteristics and velocity in' freev?ight against said surface, said obstruction having a pitch distance facing the when a Wet ?lamentary material is being 013 erated upon they provide some variation of crimp ing characteristics. The form of indentations may be various, the serrated and stepped modi ?cations shown in the drawing being merely il lustrative. The dimensions of the indentations may vary widely. However, certain of the dimen sions are preferably smaller than particular dimensions of the clumps of staple ?bers being cut, depending upon the manner in which the clumps strike the indented surface. For example, in the arrangement of Figures 1 and 2, where the‘ length of the ?ber clumps strikes transversely of the serrations, the “pitch” of the serrations should be smaller than the length of the clump, so that clump in‘ its ?ight less than the effective dimen sion of the clump parallel thereto. 3.- In a device adapted to subject ?bers to open ing, crimpin‘g'or the like, an obstruction having a stepped surface and means for 'impelling a clump of textile ?bers of spinnable length at high velocity in free ?ight against the surface, said obstruction having a pitch distance facing the clump in its flight less than the eifective dimen sion of the clump parallel thereto. 4. In a device adaptedto subject ?bers to open ing, crimping or the like, an obstruction having a grooved surface and. means for impelling a clump of textile fibers of spinnable length at high velocity in free ?ight against said surface with the length ofthe clump generally transverse of a clump bears against a plurality of the serrations. 30 the grooves, said obstruction having a pitch dis In the arrangement of Figures 3 and 4 where the steps shear off portions of the clump, the height of the steps facing the clump-s should be smaller than the bundle thickness or diameter so that a tance. facing the clump in its ?ight less than the effective dimension of the clump parallel thereto. 5. In combination, an obstruction having a stepped surface and means for impelling a clump plurality of shearings are effected upon each of textile ?bers of spinnable length at high velocity in free ?ight against the surface with As stated above the operation of this invention the length of the clump in a plane approxi has as its main purpose the opening of the staple mately parallel to the corner edges of the steps, ?ber clumps when it is performedupon a dry tow said obstruction having a pitch distance facing so that subsequent processing can be more elli 40 the clump; in its ?ight. less than the effective ciently'performed upon the product. However, dimension of the clump parallel thereto. when the invention is applied to the handling of 6. In combination, an obstruction having an arwet continuous ?lamentary material, it has the indented surface, means for cutting a clump of function not only of opening the ?ber clumps but textile ?bers from a bundle of continuous ?la of_ crimping the ?bers within the clumps. 45 mentary material and for impelling the clump in Previous procedures involving the cutting staple free ?ight against said surface, said obstruction ?bersfrom a continuous ?lamentary tow in a wet having a pitch distancefacing the clump in its condition ordinarily sent the clumps obtained at ?ight less than the effective dimension of the thecutting step through wet treatment processes, clump parallel thereto. such aswashing, bleaching and then drying. It 7. In combination, a centrifugal cutting device has been found that the application of the pro for simultaneouly cutting ?lamentary material cedure of this invention to staple ?ber clumps at and for impelling. the ?ber bundle cut therefrom the time of their cutting while in the wet condi and an obstruction having an indented surface tion has resulted in making the subsequent wet arranged-to present its indented surface to the processing and drying treatments markedly more 55 cut ?ber bundle impelledfrom said cutter. efficient‘ since the opened staple permits a better 8. In combination,‘ a, centrifugal cutting device clump. ' penetration, of the treatment liquids. and a more uniform and rapid distribution of heat and gases for simultaneously cuttingw ?lamentary material and forimpelling the cut, ?ber bundle therefrom in drying. The procedure of the present inven and a grooved obstruction arranged in the path tion has the additional highly important ad 60 of discharge of the cut ?ber bundle with the. vantage of being readily combined with the cut grooves transverseto the plane of ?ight of the ting operation so that these two steps can for practical purposes be considered as a single op 9. In combination, a centrifugal cutting device bundle. I - _ - c . erational procedure. for simultaneously cutting ?lamentary material While preferred embodiments have been dis 65 and for impelling the cut‘?ber bundle therefrom closed, the description is‘ intended to be illustra tive only, and it is to be understood that changes and variations may be made without departing from the spirit and scope of the invention as de ?ned by the appended claims. 70 I claim: 1. In a device adapted to subject ?bers to open and an obstruction, havinga stepped surface ar-. ranged to receive the cut ?ber bundles discharged , therefrom with the corner edges of the steps in a plane approximately parallel to the plane of ?ight of the clump. ' ' ROBERT A. SMITH.