SE179003C1

SE179003C1 -

Info

Publication number: SE179003C1
Authority: SE
Publication date: 1962-01-01

Description

Uppfinnare: H Waning, H S Jongepier oeb. H J 11 Janssen Prioritetbegord Iran den 31 juli 1954 (Nederkinderna) Foreliggande uppfinning hanfor sig till ett salt och en anordning for torrspinning, sdrskill for torrspinning av tradar av polyakrylnitril. Inventors: H Waning, H S Jongepier oeb. H J 11 Janssen Priority request Iran 31 July 1954 (Nederkinderna) The present invention relates to a salt and a device for dry spinning, in particular for dry spinning of threads of polyacrylonitrile.

Det är, exempelvis fran den brittiska patentskriften 614 959, kant att for torrspinning ay polyakrylnitril upplosa polymeren i exempelvis dimetylformamid, 15- till 25-procentig losning, vilken losning sprutas vid hog temperatur genom ett spinnmunstycke monterat i ovre delen av ett spinnsehakt, varefter polyakrylnitriltraden erhalles genom avdrivfling av losningsmedlet. Avdrivningen av losningsmedlet astadkommes genom inledning av en gas, exempelvis luft pa cirka 200° C, spinnschaktet. Den heta gasen tillfOrs antingen vid spinnschaktets nedre ande och biases ut vid ovre anden eller ledes in vid byre an-den och bases ut vid nedre anden. Spinnschaktet är vidare i allmanhet forsett med en vdrmemantel, genom vilken overhettad anga eller en upphetiningsvatska ledes vid hog temperatur. Detta ãr nodvandigt for att uppehalla den erforderliga, hoga temperaturen I schaktet. For example, from British Patent Specification 614 959, for dry spinning ay polyacrylonitrile, it is possible to dissolve the polymer in, for example, dimethylformamide, 15 to 25% solution, which solution is sprayed at high temperature through a spinning nozzle mounted in the upper part of a spinneret, after which the polyacrylonitrile thread obtained by evaporation of the solvent. The evaporation of the solvent is effected by introducing a gas, for example air at about 200 ° C, into the spin shaft. The hot gas is either supplied at the lower end of the spinneret and biased out at the upper end or led in at the upper end and based out at the lower end. The spin shaft is further generally provided with a heating jacket, through which an overheated steam or a heating vessel is passed at a high temperature. This is necessary to maintain the required high temperature in the shaft.

For uppnaende ay tillfredsstallande drift vid spinningen är det absolut nodvandigt att den trad, som bildas vid spinnmunstycket, ror sig lugnt genom schaktet. Luftvirvlar kunna namligen latt bildas i schaktet, sa aft traden fladdrar. FOljden harav as, att vissa fibrer komma i kontakt med schaktets vaggar och fastna ddr eller att intilliggande &Mar komma i kontakt med varandra, hafta samman och bilda en fiber med dubbel tjocklek. A bifogade ritning, fig. 1, som är ett tvarsnitt genom tradar av polyakrylnitril, visas en sadan dubbeltrad vid a. Det är uppenbart, att man i sklana fall far ett garn med samre kvalitet. In order to achieve satisfactory operation during spinning, it is absolutely necessary that the thread formed at the spinning nozzle moves calmly through the shaft. Namely, air vortices can be easily formed in the shaft, so often the thread flutters. The consequence is that certain fibers come into contact with the cradles of the shaft and get stuck there or that adjacent & Mar come into contact with each other, stick together and form a fiber with double thickness. A attached drawing, Fig. 1, which is a cross-section through threads of polyacrylonitrile, shows such a double thread at a. It is obvious that in sparse cases a yarn of lower quality is obtained.

Det liar nu visat sig, att tradarna rora sig lugnt genom 'axeln, cm den temperatur, vid vilken gasen infores i schaktet Sr 10-70° C och ldmpligen -° C hiigre an schaktvag. gens temperatur i narheten av spinnmunstycket. Forutom i denna avpassning av temperaturen ligger uppfinningen i foljande atgarder, vilka Oka den gynnsamma inverkan av denna temperaturskillnad mellan schaktets -vagg och den intradande luften: Den heta gasen infores i schaktets ovre ande genom ett tradnat eller en perforerad platta eller perforerad folie. Gasen infores vi-dare lampligen i det utrymme, som av n Stet. eller plattan eller folien r skill fran spinnschaktet, genom ett ringformigt, med hal for-sett r6r. It has now been found that the wires move calmly through the shaft, at the temperature at which the gas is introduced into the shaft Sr 10-70 ° C and typically - ° C above the shaft wave. temperature near the spinneret. In addition to this adaptation of temperature, the invention lies in the following procedures, which increase the beneficial effect of this temperature difference between the shaft wall and the incoming air: The hot gas is introduced into the upper spirit of the shaft through a threaded or perforated plate or perforated foil. The gas is further suitably introduced into the space provided by n Stet. or the plate or foil is separated from the spinneret by an annular, non-slip tube.

Pa nagot avstand fran. spinnmunstycket infores aven het gas genom en ringformig slits. At some distance from. the spinneret is also introduced into the hot gas through an annular slot.

Pa nagot avstand fran spinnmunstycket ãr anordnat ett organ i schaktet, vilket har till uppgift att styra den heta gasen och utgores av en mantel, som has formen av en stympad kon, pa sadant salt att den ringformiga slits, som Sr namnd under punkt 2, mynnar mellan schaktets vagg och styrelementet. At some distance from the spinneret a member is arranged in the shaft, which has the task of controlling the hot gas and consists of a jacket, which has the shape of a truncated cone, on such a salt that the annular slit, as Sr mentioned under point 2, opens between the shaft of the shaft and the guide element.

Anordningen enligt uppfinningen kommer i det foljande att beskrivas med hanvisning till fig. 2, som visar ett langdsnitt genom ovre delen av ett schakt 1, den runt denna anordnade upphettningsmanteln 2, traden 5 och spinnmunstycket 6. Upphettningsmediet for spinnschaktets mantel intrader i manteln vid 3 och lanmar den vid 4. Upphettningsgasen intrader i Ovre delen av spinnschaktet genom ett ringformigt ror med hal 7 och nar den aterstaende delen av schaktet genom tradnatet 8, s. k. trklduk nr 40 av elektrolytnickel. Upphettningsgasen inledes vidare i schaktet genom den ringformiga slitsen 9, till vilken gasen le-des genom tillforselroret 10, den ringformiga kanalen 11 och oppningarna 12. Till kanalen 13 är anslutet ett styrorgan 14 med formen av manteln till en stympad ken. 2— — Exempel 1. a) En 20-procentig 15sning av polyakrylnitril i dimetylformamid sprutades genom ett spinnmunstycke med 40 hal in i ett spinnschakt enligt fig. 2, i vilket luft pa 200° -C endast infordes genom det ringfornuga roret 7. Spinnschaktets vagg halls vid en temperatur av 200° C. Natet 8 och styrorganet 14 voro borttagna. Da man f8rfor pa detta aft, syntes det vara fullstandigt omojligt att genomfora regeIbunden spinning. Till f151jd av fibrernas starka fladdring upptradde fiberbrott ofta. b) Da man f8rfor pa samma satt som enligt fOregaende stycke med den skillnaden, att spinnschaktet hölIs vid 160° C, ffirlopte spinningen regelbundet, ehuru tra dens r5relse i spinnschaktet fortfarande var nagot orolig. Den spunnna traden syntes emellertid inneUlla 3-5 clabbla fibrer. The device according to the invention will be described in the following with reference to Fig. 2, which shows a longitudinal section through the upper part of a shaft 1, the heating jacket 2 arranged around it, the wire 5 and the spinning nozzle 6. The heating medium for the spinning shaft jacket enters the jacket at 3 and land it at 4. The heating gas enters the upper part of the spinneret through an annular tube with hal 7 and reaches the remaining part of the shaft through the wire 8, so-called dry cloth no. 40 of electrolyte nickel. The heating gas is further introduced into the shaft through the annular slot 9, to which the gas is led through the supply pipe 10, the annular channel 11 and the openings 12. To the channel 13 a control member 14 with the shape of the jacket is connected to a truncated ken. Example 1 a) A 20% solution of polyacrylonitrile in dimethylformamide was sprayed through a 40 halide spinneret into a spinneret of Fig. 2, into which air at 200 ° C was introduced only through the annular tube 7. The spinneret. cradle is kept at a temperature of 200 ° C. The seam 8 and the guide means 14 were removed. When attempted this evening, it seemed completely impossible to carry out regular spinning. Due to the strong flutter of the fibers, fiber breakage often occurred. b) When proceeding in the same manner as in the previous paragraph with the difference that the spinning shaft was kept at 160 ° C, the spinning proceeded regularly, although its movement in the spinning shaft was still somewhat disturbing. However, the spun yarn appeared to contain 3-5 clabbla fibers.

Exempel 2. Om spinningen genomfordes pa det i exempel lb angivna sattet med natet 8 och styrorganet 14 anordnade i schaktet, varjamte samma mangd het luft pa 200° C infordes genom slitsen 9 som genom rdret 7, forhipte spinningen mycket regelbundet utan bildning av nagra dubbla fibrer I det bildade garnet. Example 2. If the spinning was carried out in the manner indicated in Example 1b with the seam 8 and the guide means 14 arranged in the shaft, the same amount of hot air at 200 ° C was introduced through the slot 9 as through the tube 7, the spinning proceeded very regularly without forming any double fibers In the yarn formed.

Claims

Patent claim:

1. By spinning dry spinning of polyacrylonitrile fibers, in which the spinning solution is injected through a spinning nozzle into a spinning shaft, in which the solder is driven off the spinning solution, the yag is heated by means of a heating jacket or hot gas is led into the shaft space above the spinning nozzle. temperature, at which the gas enters the shaft, is 10-70 ° C and probably 20-40 ° C higher than the temperature of the shaft cradle near the spinneret, and that hot gas is also led into the shaft through an annular slot and that pa. some distance Iran the spinning nozzle arranged a guide means for the hot gas in the form of a jacket for a truncated cone, and the annular slot opens into the space between the shaft of the shaft and the guide means.

Device for carrying out the set according to claim 1, comprising a spinning shaft (1) provided with a heating jacket (2), in which there is arranged a spinning nozzle (6) and a supply opening for hot gas, placed above the spinning nozzle, marked by an annular slot (9), through which area a heated gas can be supplied, and a guide means (14), which takes the form of a mantle to a truncated lion, mounted on. side salt in the shaft, that the annular slot (9) will open in the space between the guide member (11) and the shaft cradle (1).

3. Products manufactured in accordance with the method claimed in the patent claim. 1. Publications: Patents from France 1,046,392, 1,056,662; Great Britain 614 959; USA 2 636 217.