METHOD FOR OBTAINING VISCOSE FILAMENT RAYON WITH CYCLICALLY VARYING LINEAR DENSITY CALLED "FLAME" RAYON, AN INSTALLATION FOR THE REALIZATION OF THIS METHOD, AND A PRODUCT, OBTAINED USING THIS METHOD AND THIS INSTALLATION

Abstract

Innovation suggests methods and installations for productions of viscose filament rayon with cyclically varying linear density. According to the method of the invention, constantly synchronizated viscose solution supplying and spinning devices actuation is interrupted, as first (27) and second (28) spinning devices and arranging freshly spun yam in centrifuge system 39-5 are actuated by the use of existing power feeding installation (40-4), motors 40-1 and 40-2 and reduction gear groups 39-1 and 39-2 named as the first power feeding and actuating installation. According to the method of the invention new power feeding 40-7 and actuating; 40-3 installation is added to the same spinning machine named second power feeding and actuating installation which work runs under unit 42 control. According to the invention power shaft 21 actuation do not depends on other spinning devices actuation anymore and quantity of viscose dozed to the spinning could be changed independently of other devices work.

When to the spinning machine one or two individual installations for dying are joined suggested method allows production of dyed in one or two colours filament rayon with cyclically varying linear density.

Claims

1. A method for obtaining viscose filament rayon with cyclically varying thickness, including the following stages: mercerization of initial pulp i.e. processing with a concentrated solution of sodium hydroxide, resulting in alkali cellulose, which afterwards undergoes the process of destruction to decrease the cellulose degree of polymerization, followed by temperature reduction and dosing of the alkali cellulose amount for the production of one batch of viscose; carbon-disulphide treatment which causes the alkali cellulose to transform into cellulose xanthate; the cellulose solution of one batch is then mixed and homogenized with the one from the previous and the following batch and deaerated, filtered to remove the impurities; then the viscose solution is fed for spinning to the spinning machine, as the viscose solution coming out from the spinnerets enters the spin bath where as a result of the chemical reactions in course transforms into filament fibres which are passed through spinning devices to a centrifuge at each working position in order a rayon cake to be formed; With the main characteristic that the spinning is performed by interrupting the synchronization of the viscose solution supply to the spinnerets of spinning machine and the takeover of the freshly-spun in the spin bath filament rayon by separately actuating of the first and the second spinning devices and the rayon arranging in centrifuge device using the existing first power feeding installation, and separately actuation and control of the power shaft and viscose dozing pump joined to it by using new second power feeding installation, run by a control unit (inverter) thus carrying out a programmed change of the quantity of the supplied for spinning viscose independently from the operation of the first and second spinning and etc., devices of the spinning machine.

2. A method for obtaining dyed in mass viscose filament rayon with cyclically varying thickness/linear density according to claim 1, with the main characteristic that viscose solution before spinning is mixed with preliminarily prepared pigment suspension from one of a couple of dispersed in water organic pigments prepared as pastes; homogenization of the mixture, which is passed for the same way of spinning as claim 1 and all other stages of the above-described processes.

3. A method for obtaining bicolour dyed in mass viscose filament rayon with cyclically varying thickness/linear density according to claim 1, with the main characteristic that to the spinning machine are added two independently operating installations for dying in mass by the use of which viscose solution before spinning could be coloured by two preliminary prepared different in colour pigment suspensions. By the use of two homogenizers and two local viscose pipe collectors to the neighbour working positions of spinning machine at the same time could be supplied differently coloured viscose solutions for spinning. After spinning differently coloured freshly spun filament fibers from these two working positions are transferred to the first working position centrifuge only by the use of first and second spinning devices of the same first working position. After spinning as claim 1 freshly spun bicolour filament rayon with cyclically varying thickness is passing through all other stages of the above described processes.

4. An installation for the production of viscose filament rayon with cyclically varying thickness, added to the existing spinning machine part of which are local viscose pipe collector (38) to which a range of working positions are joined each one supplied with viscose solution dozing pumps, power shaft actuating viscose dozing pumps, first and second spinning devices (27,28), an arranging system (39-5) by which freshly spun filament rayon is transferred from second spinning device (28) to the centrifuge (29) where freshly spun cake is obtained, two electric motors 40-1 and 40-2 powered by electricity from first feeding unit 40-4 and actuating as follows: first electric motor 40-1 through the first reduction gear 39-1 and a gear transmission system 39-3 is connected for actuation of first 27-1 and the second 28-1 spinning devices as the second electric motor (40-2) is actuating the arranging device 39-5 with the main characteristic that a second power feeding installation is added consisting of a third electric motor (40-3), powered by electricity from the second feeding unit (40-7) and connected to it a new control unit (42controlling inverter system), as the third electric motor through an additional reduction gear group (39-2) is actuating the power shaft (21) only and the viscose solution dosing pumps (22) both work of which is controlled by unit (42) according to the preliminarily set into this unit program operating range of changes of the power shaft (21) and viscose dozing pumps; /22/revolutions, independently from the operation of the all other devices. The spinning on the spinning machine (10) is followed by all other stages of the above-described processes from washing unit (12), till a storage unit (19).

5. An installation for the production of dyed in mass viscose filament rayon with cyclically varying thickness according to claim 2, with the main characteristic that to the spinning machine (10) an individual installation for dying in mass (10-1) is joined, including a storage tank for a preliminarily prepared pigment suspension (30), a suspension dosing pump (31), a homogenizer (32(connected to the local viscose pipe collector of the spinning machine, to which are joined a range of working positions. Power shaft and all other spinning devices actuating is arranged in accordance with scheme described in claim 4.

6. An installation for the production of bicolour viscose filament rayon with cyclically varying thickness according to claim 3, with the main characteristic that to the spinning machine (10) are joined two individual installations for dying in mass (10-1), with two storage tanks for preliminarily prepared pigment suspensions (30), including two suspension dosing pumps 31 and two homogenizers 32 connected through two local viscose pipe collectors to one spinning machine with joined to them a range of working positions. The actuation of viscose dozing pumps independently to which viscose pipe collectors are joined is arranged by one and the same power shaft (21) which operation follows the scheme described in Clam 4.

7. Viscose filament rayon with cyclically varying thickness/linear density obtained following the method and installation as described in claim 1.

8. Viscose filament rayon dyed in mass with cyclically varying thickness/linear density obtained following the method and installation as described in claim 2.

9. Bicolour viscose filament rayon with cyclically varying thickness/linear density obtained following the method and installation as described in claim 3.

Description

SHORT DESCRIPTION OF THE FIGURES ENCLOSED

[0044] FIG. 1 illustrates the sequence of the processes in the classical production of raw white bright or dyed in mass viscose filament rayon.

[0045] FIG. 2 presents the classical unit structure of installation 10-1, i.e. the installation performing the dyeing in mass of the viscose filament rayon

[0046] FIG. 3 illustrates a design of the classical actuation of the spinning machine for the production of raw white bright or dyed in mass viscose rayon filament rayon with uniform thickness/linear density.

[0047] FIG. 4 presents the actuation of the spinning machine according to the invention.

[0048] FIG. 5 illustrates the variation of the linear density/thickness/of the viscose filament rayon from one cake, whose spinning is performed following the classical spinning procedure i.e. of the actuation of the spinning machine's units. On the abscissa is marked the rayon fiber length of investigated rayon cake, and the ordinate (Y-axis) shows the variation of the fiber linear density/thickness presented in tex. This figure gives a clear concept of the way the rayon fibre thickness changes from start to the end of a centrifugal filament rayon cake using the classical spinning procedure.

[0049] FIG. 6 illustrates the variation of the linear density/thickness of a viscose filament rayon filament from cake whose spinning follows the innovative method and actuation procedure of the spinning machine's units according to the invention.

[0050] FIG. 7 illustrates the installation, which added to FIG. 4, enables the production of bicolour rayon with cyclically varying thickness(flame one) simultaneously.

MODEL PERFORMANCE OF THE INVENTION

[0051] The installation for the production of raw white bright or dyed in mass viscose filament rayon presented on FIG. 1 includes the following, units, consecutively connected following the technological operations as: unit 1 for mercerizationtreatment of the initial pulp (cellulose) with a concentrated solution of sodium hydroxide, unit 2for aging, here as a result of the process of destruction alkali cellulose is obtained, i.e. the degree of polymerization is decreased, unit 3temperature reduction, unit 4dosing of the alkali cellulose amount for the production of one batch of viscose, unit 5for carbon-disulphide treatment of the alkali cellulose to obtain cellulose xanthate, units 6 and 7 for mixing and homogenization of the cellulose solution of one batch to the one from the previous and the following batch and de aeration, unit 8filtering to remove the impurities.

[0052] Unit 9, for the preparation of a dyeing suspension and unit 10-1 for viscose solution dyeing could be connected to spinning machine 10 if dyed in mass rayon filament rayon have to be produced. After the spinning, the freshly-spun viscose rayon is treated in unit 12 with various solutions, prepared in unit 13 to remove the residues from the spin bath and chemical reactions after the spinning.

[0053] Further, following the technology serially connected are units 14, 15, 16, 17 and 18 for centrifugation, drying, conditioning, rewinding, quality control inspection and packing as finished production 19 to be stored in unit 20.

[0054] In order to obtain dyed in mass filament rayon, to the spinning machine 10 an individual dyeing installation 10-1 is connected. As shown in FIG. 2, it includes a pigment suspension storage tank 30, pigment suspension dosing pump 31, a control unit 34 for the dosing pump 31 control a homogenizer 32, where the pigment or pigments particles have to be mixes with viscose solution and distributed uniformly throughout the entire volume of it; reduction geared electromotors 35 which guarantee the components mixing inside of homogenizer 32 and suspension circulation in suspension storage tank/30/. From the main pipe collector 36 the cellulose solution passes into the homogenizer 32 through the local viscose pipeline 37 and flow meter 33. The already dyed after the homogenization solution fills up under pressure the local viscose pipe collector 38, which supplies dyed in mass viscose to all the working positions of the spinning machine 10.

[0055] According to FIG. 4 for the actuation of the spinning machine are used two independent from each other power feeding units as follows: feeding unit 40-4 powers the first and the second electric motors 40-1 and 40-2, as motor 40-1 through reduction gear 39-1 and the gear transmission system 39-3 continues actuating the first 27-1 and second 28-1 spinning devices, and the motor 40-2 through reduction gear 39-4 keeps actuating the fiber arranging in the centrifuge 29-1 device 39-5 of the spinning machine 10. According to the invention is added a third electric motor 40-3, powered by a second feeding unit 40-7, as the electric motor 40-3, which through reduction gear 39-2 actuates the power shaft 21 and the viscose solution dosing pump 22 joined to it. According to the invention, the third electric motor operation is controlled by the control units 42 and 40-7.

[0056] Thus, the actuation of the power shaft 21 is performed independently from the powering of the spinning devices 27-1 and 28-1. In accordance with the program set in the control units 42 and 40-7, a change of the revolutions of the power shaft takes placewhen the number of revolutions is higher, a greater amount of viscose is being dosed, so the fiber spun will be thicker. Oppositely when the number of power shaft revolutions is lower, a smaller amount of the solution to be spun will result in a thinner fiber. The result from the alternationhigher/lower solution fed for spinning, according to the invented method and program set in control unit 42, is the production of viscose filament rayon with a cyclically varying thickness/linear density/without the number of filaments changes.

[0057] Example if the classical scheme of spinning devices including power shaft actuating is under use the spinning will run with constant quantity of viscose solution dozed from dozing pumps and transferred from local pipe collector to the spinnerets for spinning. This quantity supplied for spinning will be around 22 grams per minute and is a constant for the whole production cycle of 33.0 tex for example. The result of this classical production behaviour, where power shaft and other spinning devices actuation is strongly connected is production of 33.0 tex with actual count between 33.4 till 35.3 because of centrifugal way of spinning presented on FIG. 5.

[0058] If actuating scheme is under use and actuating of power shaft is independent from other spinning devises according innovation and program in control unit 42 set power shaft revolutions could be cyclically changed from 8 to 24 turns and respectively the quantity of viscose solution fed for spinning will cyclically range between 7 and 30 grams per minute. The result of this innovative way of viscose solution dozing for winning is production of 33.0 tex filament rayon with cyclically vanilla thickness between 18.0 till 35.0 tex presented on FIG. 6.

[0059] In the production of dyed in mass viscose filament rayon with cyclically varying thickness, the prepared viscose solution from pipeline 37 before being fed under pressure through flow meter 33 in the pipe collector 38 of the spinning machine is supplied to the homogenizer 32 of the installation for the production of dyed in mass viscose filament rayon. The preliminarily prepared pigment suspension, which for the time of the production cycle is stored in tank 30 (FIG. 2) is dosed by pump 31 to the viscose solution before the same is passed to the homogenizer 32 (FIG. 2). In the homogenizer 32 the viscose solution is mixed with the dosed by pump 31 suspension thus causing the pigment particles to distribute uniformly throughout its entire volume. The already dyed after homogenization viscose solution is again fed under pressure to the local viscose pipe collector 38 of the spinning machine /FIG. 2/, to which the solution dosing, pumps have been added. The quantity of the already dyed in mass viscose supplied to the spinnerets for spinning is controlled by the program set in the control unit 42. Based on this program, the frequency inverter part of control unit 42 operate the motor 40-3, which through reduction gear 39-2 and the connection 41-7 actuates the power shaft 21 and respectively the viscose dosing pumps 22. When the number of revs of the power shall is higher, a greater amount of viscose is dosed and the fiber spun is thicker, and when the number of power shaft revs are lower the spun fiber is thinner. Thus, dyed in mass viscose filament rayon with cyclical change of the linear density /thickness/ is obtained, where linear density cyclically deviation depends on the type of program set in the control unit 42.

[0060] Further, the installation operates in the already known way: in unit 12 the freshly-spun viscose filament rayon is treated with various solutions prepared in unit 13 for removal of the residues of the spin bath, the sodium sulfate and sulfur resulted from the chemical reactions during spinning.

[0061] The obtained semi-finished product is centrifuged, conditioned rewound and prepared for quality control inspection and packaging as finished productionunits 14, 15, 16, 17, 18, 19 and after quality inspection stored in unit 20.

[0062] In control unit 42 can be installed various programs for the operation control of the third electric motor 40-3, which practically enhances the possibilities for production of different types of viscose filament rayon with cyclically variation of thickness, i.e. differently (flamed).

[0063] With the new product, a wide range of items is created of a new fancy article preparingviscose filament rayon yarn with cyclically variation of the linear density /thickness/ along the fiber length with unique effects.