DD219223A1 - METHOD FOR THE CHALLENGING, LOSS-FREE SPINNING OF HIGH-PERFORMANCE REGENERATIVE FIBERS - Google Patents

Abstract

The invention relates to a method for modifying the Abadspinnverfahrens and allows the production of two mutually dependent fiber types (wool and cotton type) of high uniformity in favorable raw material and energy consumption. The object is achieved to produce regenerated from low-viscosity viscose regenerated fibers by low-viscosity viscose high cellulose concentration in spunballs spun with little (wool type) or much (cotton type) zinc sulfate by using Viellochduesen with little delay and immediately subjected to a reaction-inhibiting, stepped treatment becomes. The drawing is carried out in a plasticizing bath, whereby the water used in the regeneration plant is used in the cotton type and passed into the spinning bath system after passing through the cable washing machine. The water obtained from the wool type regenerators is used in the first post-treatment stages. The use of viscose modifiers is reduced due to the reaction-inhibiting treatment. By alkaline-oxidative suspension with subsequent acid and neutral wash the desulfurization step. Fig. 1

Description

Title of Invention

Method for galette-free, low-loss spinning of higher quality regenerated fibers

Field of application of the invention '-

The invention relates to a method of modifying the one-bath spinning process and enables the production of high-uniformity fiber-spun fabrics.

Characteristic of the known technical solutions

The production of regenerated fibers by the one-bath and Mehrbadverfahren is known (üährling., The production of rayon and rayon - Fachbuchverlag Leipzig 1957; K. Götze, man-made fibers by the viscose Springer-Verlag, Berlin, Heidelberg * New York, 1967). The one-bath spinning is driving the Ver most commonly used because easy operation is given because of the simple machine design, sulfate concentration through the use of spinning baths high sulfuric acid and sodium at Spinnbadtemperaturen of 46 54 ⁰ C highly productive performances are achieved and the fiber webs in many applications meet the requirements of the textile industry (K. Götze, man-made fibers according to the viscose process, Vol. 1, p 567, Vol 2, p 856, DD-PS 118 130).

From a qualitative disadvantage, however, is that at the end of a single-bath machine, so the main cable extractor, a different regeneration state of the individual cable is present, since the distance of the first spinning unit to the drafting system is a multiple of the distance of the last spinning station. Thus, no conditions exist to perform optimal plasticizing and stretching because of excessive gamma degradation (gamma value: number of moles of CS ₂ to 100 moles ^c s ^H io ° 5 ^ ^{of the wei} ~ test away from Plastifizierungsbad spinning stations to capillary breaks during stretching process leads. '

The reaction inhibition, for example, by using modifiers, zinc sulfate-rich baths, or the cooling of the main cable always leads only to a general slowdown in the gamma value degradation. The actual equalization, ie the adjustment of the degree of decomposition within a narrow tolerance range, does not succeed. (DD-PS 71 332) '. ': ... ' ^: .- ··; , ' ^: ' ..: ·. .. '...'; - '''

In the multi-bath spinning process for the production of high-quality regenerated fibers, these disadvantages are reversed in the form that only a few, up to a maximum of 8, single cables, which are usually spun below 40 ⁰ C, combined to form a cable part and between godet pairs in a second bath at temperatures of 85 - 95 C are drawn * Several such pretreated cable parts make up the main cable, which is received at the machine end of the main trigger and subjected to further treatment (K. Götze, man-made fibers according to the viscose process, Vol. 1, p. 670, Vol. 2, p 857, BE-PS 586 365, BE-PS 581 631, 3A-A 14565/60, 3A-A 168/52).

However, the Anspinntechnik according to this method is difficult, the mechanical engineering effort and space requirements are high. Due to the requirement, the

To introduce single or partial cable in a highly plastic state in the second bath, must be compared to the one-bath process at reduced spinning speed. The use of regenerating systems for fiber cables with the usual post-treatment by neutral washing and desulfurization incurs disadvantages due to poorly resolved fiber stacks.

Object of the invention > '

The object of the invention is to produce regenerated fibers which can be assigned in use value between normal single-bath staple fibers and high-quality multi-fiber staple fibers, without having to use the Mehrbadgalettenverfahren and a reduction of the spinning speed. _r ,

Explanation of the essence of the invention

The object of the invention is to produce a wool type (type 'N) and a cotton type (type B) from a low-alkaline viscose which is uniform in the basic composition and to spin this viscose at the temperatures customary for one-bath processes.

According to the invention, for low-loss, low-loss spinning of higher-grade regenerated fibers, low-viscosity viscose, which has been increased by 6 10 % in the cellulose concentration with a corresponding increase in viscose viscosities, ie maintaining the average degree of polymerisation of 290 320, becomes two-thirds of type 'W at a viscose level from 94 to 98 EZ ₃₀ and a temperature of 48 to 52 ^° C. in low-zinc spinning baths containing 84 to 88 g of H ₂ SO ₄ , 320 to 340 g of Na ₃ SO ₄ and 3-5 g of ZnSO ₄ per liter, one-third to the type 8 at a viscosity of 100-104

EZo _n and a temperature of 44 - 48 C in zinc-rich spinning baths with 78 - 82 g H ₂ SO ₄ , 230 - 250 g Na ₂ SO ₄ and 40 - 60 g ZnSO ₄ per liter at a delay of 0.9 - 1, 2 spun.

Multi-hole nozzles with 2000-60000 boreholes are used, and a partial cable made up of 2 to 8 spinning units at a distance of a maximum of 3 m, based on the furthest away from the spinning station, is passed through a washing bath which, in the case of type W 3 - 4% by mass H ₃ SO ₄ at 30 - 40 ⁰ C, the type B contains 3 - 4 mass HpSO ₄ at 20 - 25 ⁰ C and in which by variable, rigid yarn guide a Waschstreckeneinstellung of 0.80 - 2.40 m after the first part cable to 0.40 - 1, 20 m after the last sub-cable is made.

The constructed according to the countercurrent principle method of guiding the washing liquids is designed so that the absorbed by the main take-off, equalized main cable in type W is passed through a plasticizing, which is supplied with water of 35 - 45 ⁰ C from the neutral washing stages of fiber post-treatment. The xDurchsatzmenge is designed so that a concentration of H ₂ SO ₄ of 1 - 30% is present Kabelverstreckung made - 2 mass% for the _A to 20th

The upper part of this bath is used to supply the wash bath. The again occurring here Badüberschuß is repelled into the channel. '

For the production of the type B countercurrent washing machine is extended by one stage, by excluding the 90 ⁰ C hot overflow water of the regenerators type B with a content of 0.5-1 mass% H_SO. on

O. & -4. ,

60-70 C, into the plasticizing trough.

and 40 - 60 % at a temperature of 55 65 ⁰ C is stretched. After enrichment to 1 - 2.Masseprozent H-SO. and again cooling to 20 - 25 ⁰ C, the bath is discharged into the washing bath circulation. The resulting excess bath is passed completely into the Spinnbadsysteme. ,

The regeneration of the relaxed main cable type W or B is done in a known manner at 92-94 ⁰ C in 0.5-1% sulfuric acid in a closed tube system with coupled carbon disulfide recovery ·

The fiber cables of type W and B are cut to the required staple length and with 65 - 75 ⁰ C hot, neutral to slightly alkaline water, which is removed from the subsequent washing and sodium hydroxide solution is added (pH 7 - 10) and 1 -2% by mass Na ^ SO ^, 0.02% by mass of oxidants, such as NaOCl or HO, and the same amount of washing-active substances based on sulfonic acid compounds, suspended on the aftertreatment machine. .

The subsequent treatment of the fiber material is carried out at 75-85 ⁰ C at an acid concentration from .05 to 0.15% by mass of H ₃ SO _4, said Waschbadkonzentration and temperature by mixing neutral water of ftachbehandlungsmaschine with verschlepptem alkaline water of Faseraufschwemmung and hot upper reaches of water is achieved from the type W regenerators. Then, the neutral wash is carried out at 70-80 ⁰ C.

The sulphide-free wastewater is fed to the channel after filtration and passage of heat exchangers.

The preferably heated to 30 - 35 ⁰ G viscose for the production of the type B is added immediately before spinning with 0.2-0.4 mass% modifier, based on the cellulose content of the viscose, the same parts by mass of oxaethylated fatty amines and polyaethylene oxide consists.

Embodiment (Figures 1 and 2)

On a 32-digit single-bath spinning machine with 30 cm graduation for each spinning station, 8 spinning stations are combined to form 4 adjacent spinning stations with double power and it is 0.08 mm in the VVq 11 type of 0.42 tex with 25000-Lochdusen the 8ohrungsweite. in the cotton type of 0.13 tex with 60000-Lochdusen the Bohrüngsweite 0.05 mm spun with .40 m / min take-off speed.

A viscose made from 80 % hardwood and 20 % softwood pulp with approx. 91.5 % alpha-cellulose content and containing 9% by mass of cellulose and 5.2% by mass of NaOH is used. The viscosity is determined in the falling ball viscometer at 80 ° inclination with 160 see. The average degree of polymerisation is 300. Viscosity is adjusted to 96 EZ ₃₀ for the wool type and to 102 EZ ₃₀ for the cotton type. (Determination of the electrolyte number EZ ₃₀ see Faserforschung and Textiltechnik 16, (1965) 5, p. 240.)

The spinning bath is the 'WoIltyp at a temperature of 50 ⁰ C to 86 g H ₃ SO ₄ , 330 g Na ₃ SO ₄ and. 4 g of ZnSO ₄ per liter, 240 g of Ma ₃ SO ₄ adjusted und.50 g of ZnSO ₄ per liter at a temperature of 46 Baumwollty'p at ⁰ C to 80 g of H ₃ SO _4, ·

The Fig. 1, which shows the process scheme of Wolltypherstellung, resulting from four combined single spinning stations with double spinning power part cable 1 is passed over Abstreufadenadenführer 2 and a non-driven role 3 in the 2 m away '// ash 4, where it over rigid Umlenkfadenführer and Scraper 5 in a width of 10 cm graded from 1, SO m treated in the first sub-cable to 0.40 m at the fourth sub-cable and again via a non-driven role 6 and yarn guide 7 as the main cable 8 is combined.

The main cable of the Baurawolltyps is about the main trigger 9 and according to Fig. 2, showing the specific steps in the cotton type manufacturing, via the plasticizer 10OJ whose bath liquid contains 1-2 mass M ₃ SO ₄ , passed to the drafting device 11, where a short. Cable surface cooling by Wasserauf spraying made after the performed at 63 ⁰ C by 50 % drawing

The draw of the wool type is in analogous igis-e to 25 % be:

set,

to 25 % at 40 ⁰ C in the plasticization trough 10

The complete regeneration of the main cable 8, combined with the CS ₂ recovery in both fiber types, is carried out in the regeneration systems 12 and 12 'at an acid concentration of 0.7 percent H ₃ SO ₄ in the relaxed state at 93 ⁰ C.

The reaktionshemmende'Waschbadumlaufsystem 13 is in the wool type ingot to 3.5 ^H o ^ 4 ^ ^{ei e: j} - ^ner temperature of

4 35 ⁰ C adjusted by regulating the fresh water inlet from the Plastifizierungsrinne 10, which is supplied from the neutral washing area of the aftertreatment 16.

:. . ''^':. · - ⁸ -The Überschußbad is repelled in the channel 14.

In the case of the cotton type, according to FIG. 2, the 90 ^° C. hot bath obtained in the same amount for the fiber production of this type / type produced in the regeneration plants 12 'and having a content of 0.7% H ₂ SO. cooled to 65 ⁰ C and passed into the plasticization trough 10 '. The upper run bath after repeated cooling via a heat exchanger 2O'auf 22 ⁰ C at 1.5 percent H ₃ SO ₄ in the WascHbadumlaufsystem 13 'registered. The resulting as a result of this supply excess is passed completely into the Spinnbadumlaufsystem 21.

The ZnSO.-carbon bath of regeneration systems 12 of the wool type will be guided in the recirculation system 17 of the staple fiber after treatment for both fiber types and by supplying 75 ⁰ C hot water, the neutral washing zones 16 as well as by the adhering to the nonwoven Aufschwemmwasser to 80 ⁰ C at a H ₂ S0 ₄ Concentration of 0.1 mass% *:

The upper portion of the acid bath 17 containing 1 to 2 mass of Na ₃ SO ₄ with 0.1 mass of H ₂ SO ₄ is passed into the circulation circulation system 15, where after neutralization with black liquor and supply of NaOCl liquor and sulfonic acid-based washing-active substances a pH Value of 7-10 and a NaOCl content and content of detergent substances of 0.02 mass each is set at 70 ⁰ C. The excess of the sulfide-free Aufschwemmflüssigkeit is passed after passing through a filter device 18 and a heat exchanger 19 in the channel 14.

The feed of 0.3 ingot modifier to the viscose for Erspinnung of the type B according to the invention takes place in such a manner that the viscose passes through a first heat exchanger and the diluted, warmed to 32 ⁰ C Modifikatormischung is entered via a ho.chtourigen Mixer spinning unrnittelbarvor ,

Claims (4)

Erfindunqsanspruch 1. A method for galettelosen, low-loss spinning of higher quality regenerated fibers, characterized in that low-alkali viscoses are processed. - increased relative to the initial concentration by 6-10 percent in the cellulose concentration at an average degree of polymerization of 290-320 and two-thirds to a wool type at a viscidity of 94-98 EZ ₃₀ and a spin bath composition of 84-88 g H ₂ SO ₄ , 320 340 g of Na ₂ SO ₄ and 3-5 g of ZnSO ₄ ΡΓ ° liter at 48 52 ⁰ C, one-third to a Baumwo-Lltyp at a viscidity of 100 - 104 EZ ₃₀ and a spin bath composition of 78 - 82 g of H ₂ SO ₄ , 230 250 g Na ₃ SO ₄ and 40 - SO g ZnSO ₄ per liter at 44 - 48 C and a draft of 0.9 - 1.2 are spun, with one from two to eight 20000- to 60000-hole nozzles produced and united sub-cable at a distance of a maximum of 3m, based on the furthest spinning station, is pulled through a washing bath, the wool type 3-4 pigs H ₃ SO ₄ at 30 - 40 ⁰ C, the cotton type 3-4 pigs H ₂ SO ₄ at 20 - 25 ⁰ C and wherein the washing path variable to 0.80 - 2.40 m after the first sub-cable to 0.40 - 1.20 m after the last sub-cable set by thread guide and the subsequent treatment of the main cable in one ^: - 10 - Plasticizing trough for 1 - 2 massed H ₃ SO ₄ , for the wool type with a draft of 20 - 30 % at a temperature of 35 - 45, C, for cotton types around 40 -; 60 % at a temperature of 55 - 65 ⁰ C is made. 2. The method according to item 1, characterized in that the waste water of the regeneration plant of the type B is passed through the Plastifizierungsrinne, then through the Waschbadumlaufsystem and then into the Spinnbadsystem. . 3. The method according to item 1 and 2, characterized in that an aqueous slurry of fiber stacks of WoIl- and cotton type using the neutralized with sodium hydroxide wastewater from the regeneration of the wool type in the range pH 7 - 10 in the presence of 0.02 mass of oxidants and the same amount of washing-active substances based on sulfonic acid and 1 2% by mass of Na ₂ SO ₄ at 65-75 ⁰ C is performed and subse-. ßend a treatment of the nonwoven fabric with heated to 75 85 ⁰ C H ₃ SO ₄ of 0.05 - 0.15 pigs with subsequent aqueous neutral washing at 70 - 80 ⁰ C is performed. 4. The method according to item 1 to 3, characterized in that the heated to 30 - 35 ⁰ C viscose immediately before spinning the cotton type 0.2 to 0.4% by weight modifier, based on the cellulose content of the viscose, are added consists of equal proportions of an oxaethylated fatty amine and a Polyaethylenoxides. For this 2 pages drawing - - 11 -