PL29498B1 - The method of processing cut viscose fibers. - Google Patents
The method of processing cut viscose fibers. Download PDFInfo
- Publication number
- PL29498B1 PL29498B1 PL29498A PL2949838A PL29498B1 PL 29498 B1 PL29498 B1 PL 29498B1 PL 29498 A PL29498 A PL 29498A PL 2949838 A PL2949838 A PL 2949838A PL 29498 B1 PL29498 B1 PL 29498B1
- Authority
- PL
- Poland
- Prior art keywords
- acid
- fibers
- viscose fibers
- processing cut
- baths
- Prior art date
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- 239000000835 fiber Substances 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 6
- 229920000297 Rayon Polymers 0.000 title claims description 3
- 239000002253 acid Substances 0.000 claims description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 150000007513 acids Chemical class 0.000 claims description 4
- 241001494479 Pecora Species 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000008043 acidic salts Chemical class 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
Description
W patencie francuskim nr 797 779 opi¬ sany jest sposób, wedlug którego na ksan- togenian celulozy dziala sie obojetnymi cieczami w odpowiednich temperaturach, które powoduja przemiane ksantogenianu w wodzian celulozy.Stwierdzono, ze stosowanie w tym ce¬ lu kapieli, zawierajacych male ilosci kwa¬ sów mineralnych, np. 0,3 — 5% kwasu siarkowego lub odpowiednie ilosci innych kwasów mineralnych, w podwyzszonych temperaturach, np. powyzej 80°C, daje do¬ bre wyniki dzieki szybszemu rozkladowi i szybszemu odpedzeniu gazowych produk¬ tów rozkladu. W przypadku stosowania kapieli slabo kwasnych temperatura ka¬ pieli rozkladajacych moze byc nieco niz¬ sza, dzieki czemu zapobiega sie wywiazy¬ waniu sie szkodliwych oparów z kapieli rozkladajacych. Prócz tego stosowanie sla¬ bo kwasnych kapieli rozkladajacych umoz¬ liwia otrzymywanie wlókien bardziej czy¬ stych i bielszych, niz w przypadku uzycia cieczy obojetnych. Wazne w tym sposobie jest stosowanie dostatecznie malego steze¬ nia kwasu, aby uniknac uszkodzenia celu¬ lozy kwasem w wysokich temperaturach.Na ogól nie nalezy stosowac bardziej ste¬ zonego kwasu niz 5°/o-owy kwas siarkowy lub odpowiednie ilosci innego kwasu mi¬ neralnego. Mozna ewentualnie równiez stosowac roztwory soli. Dobre wyniki da-je równiez stosowanie kwasnych soli za¬ miast wolnych kwasów mineralnych, np. kwasnego siarczanu.Przyklad. Z wiskozy, zawierajacej 6,5% blonnika i 6% wodorotlenku sodo¬ wego, przedzie sie nitki do 20%-owego roztworu siarczanu amonu, zawierajacego 5% siarczanu sodu, a nastepnie wlókna laczy sie w tasme. Tasme doprowadza sie w sposób ciagly do maszyny tnacej, która ja tnie na oddzielne wlókna pozadanej dlugosci. Odcinki wlókien spadaja do ryn¬ ny, przez która plynie kapiel, zawierajaca 1,5% kwasu siarkowego. Kapiel utrzymu¬ je sie w stanie wrzenia przez wdmuchi¬ wanie pary bezposredniej lub ogrzewanie rynny. Pienienie sie na skutek ogrzania zapewnia dobre rozdzielanie odcinków wlókien. PLFrench Patent No. 797 779 describes a method whereby cellulose xanthogenate is treated with inert liquids at appropriate temperatures which cause the xanthate to be converted to cellulose hydrate. Mineral acids, eg 0.3-5% sulfuric acid, or appropriate amounts of other mineral acids, at elevated temperatures, eg above 80 ° C, give good results due to faster decomposition and faster stripping of gaseous decomposition products. When weakly acid baths are used, the temperature of the decomposing baths may be slightly lower, thereby preventing the release of harmful vapors from decomposing baths. Moreover, the use of weakly acid decomposing baths makes it possible to obtain fibers which are purer and whiter than when using inert liquids. It is important to use a sufficiently low concentration of the acid in this process to avoid acid damage to the cellulose at high temperatures. In general, no more concentrated acid than 5% sulfuric acid or the appropriate amount of another muscle acid should be used. nervous. Alternatively, salt solutions can also be used. It is also possible to use acidic salts instead of free mineral acids, for example acid sulfate, for example. From a viscose containing 6.5% fiber and 6% sodium hydroxide, the strands are made into a 20% ammonium sulphate solution containing 5% sodium sulphate and then the fibers are combined into a tape. The tape is fed continuously to the cutting machine, which cuts it into separate fibers of the desired length. The fiber sections fall into a gutter through which a bath containing 1.5% sulfuric acid flows. The bath is boiled by blowing in direct steam or heating the chute. Foaming due to heating ensures good separation of the fiber sections. PL
Claims (2)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL29498B1 true PL29498B1 (en) | 1941-01-31 |
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