Патент USA US2107758код для вставки
Feb. 8, 1938. E. KNECHTEL 2,107,758 PROCESS FOR AVOIDING THE OVERCHARGING OF DRIVES FOR RAYON CENTRIFUGES Filed March 4, 1931 '10 WW3 , Patented Feb. 8, 1938 2,107,758 STAT-ES ‘PATENT '1 OFFICE 2,107,758 PROCESS FOR AVOIDING THE OVERCHARG ING OF DRIVES FOR RAYON CENTRIFUGES ' Erich Knechtel, Sydowsaue, near Stettin, Ger many, assignor to North American Rayon Cor poration, a. corporation of Delaware Application March 4, 1931, Serial No. 520,162 In Germany March 10, 1930 5 Claims. 7 ' g , In the manufacture of rayon, especially viscose , rayon, according to the so-called centrifuge or (01. 18—54) chamber of a spinning centrifuge illustrating the use of my invention. spinning pot process, where spinning baths are used containing sulphuric acid and salts and 5 Zjunder certain conditions also organic matters, certain di?iculties have arisen when the spinning Fig. 2 is a plan view of a plurality of spinning chambers illustrating the use of my invention with the covers of said chambers removed. In the drawing in which like numerals of refer pots are run at a great number of revolutions. ence indicate like parts, I represents the vertical This is particularly the case if the spindle speed ' walls of the spinning chambers and 2 indicates exceeds 5,000, for instance at from 7,000 to 12,000 the bottom partition. 10' revolutions per minute,where it has been found The partition 2 has an opening 3 through which 10 that in a continuous. operation during which, ‘in the course of several hours, the spinning pot is the spinning spindle 4 projects. The spinning pot gradually ?lled with fresh rayon, the'necessary driving forces increase in an incomprehensible cover 6 having an opening 1 for the insertion of a 15 manner which, especially in the case of electric ,motors, may cause ‘ dangerous over-loadings. ’ It has been found that this increase and addi tional load during such a spinning period is hardly caused-by an increased friction of the gears, or by the larger amount of rayon in the spinning pot. A more thorough investigation 5 is supported and rotated by the spindle 4. A thread guide tube (not shown) is illustrated in Figure 1. 15 In order to eliminate the formation of the aforementioned salt crusts with consequent dan ger of overloading the rotating means, the pots are sprayed during rotation with liquid which is brought through the spinning chamber by means H of a supply pipe 8. Branch pipes 9 having nozzles shows that with this large number of revolutions in are supported on the supply pipe 8 and are as required by the high spinning speed, and more positioned in such a manner as to send a fan so with the manufacture of a strong warpv twist, shaped spray tangentially against the side of the spinning pot. This eliminates the formation of 25 crystals with the resultant danger to the spinning crystals are caused by ‘the evaporation of spin ning bath solutions out of the spinning pot. The evaporation is accelerated by the great surface ‘speed of the pot in the surrounding atmosphere. Further tests have shown that these salt crusts make the surface of the pot uneven and thus cause a larger amount'of friction in the air, which again causes theabove over-load. According to the present invention the for mation of these salt crusts is eliminated, or the 35 ‘deposits are continuously or intermittently re 7 moved. This may be done in different ways. operation. ' From the foregoing description taken in con nection with the accompanying drawing, it is be lieved that the operation and advantages of my 30 invention will be apparent. to those skilled in the art. Having now fully set forth my invention as required by the patent statutes, what I desire to claim is: 35 1. In the method of collecting wet spun ?la ments in a driven spinning pot, the step of sub mitting the outer surface of the pot to a spray Thus, the spinning pots can be sprayed con tinuously or intermittently with liquids, such as warm water, during the working time. This water , of liquid in a direction tangential to the said sur ' 40, is able to dissolve the salt crusts immediately face and in the direction of rotation thereof while 40 . > after they begin to form. ~ the centrifuge is in operation. Another method of procedure is to maintain 2. In the method of collecting spun ?laments ' such atmospheric conditions in the spinning pot in a driven spinning pot, the step of submitting chambers as will not allow the formation of salt the outer surface of the pot to a fan-shaped spray ' 45 crusts, e. g. by maintaining an especially high air of liquid in a direction tangential to the said sur 45 humidity, or by introducing wet vapor into the face and in the direction of rotation thereof while spinning pot chambers. the centrifuge is in operation. ; Another form of this process is to spray warm water of 30-40° C. by means of a nozzlev in a. fan in a driven spinning pot, the step of submitting 50 like form in tangential direction on the outer mantle of the centrifuge pot in the direction of I its rotation. ' I In the drawing accompanying this application, 55' - Figure 1 is a cross sectional view through the 3. In the method of collecting spun ?laments the outer surface of the pot to a periodic spray 50 of liquid in a direction tangential to the said sur face and in the direction of rotation thereof while the centrifuge is in operation. 4. In the method of collecting spun ?laments in a driven spinning pot, the step of submitting 55 2 ‘ ' 2,107,758 the outer surface of the pot to a spray of liquid maintained at a temperature between about 30° and 40° C. in a direction tangential to the said surface and in the direction of rotation thereof while the centrifuge is in operation. 5. In the method of collecting spun ?laments in a driven spinning pot, the step of submitting the outer surface of the pot to a spray of liquid in a direction tangential to the said surface and. in the direction of rotation thereof while the centrifuge is in operation the said vspray being discontinued during a part of the operation of the 5 centrifuge. ‘ 1 ‘ ERICH KNECII-ITEL.