CH166503A

CH166503A - Process for the manufacture of fuses.

Info

Publication number: CH166503A
Authority: CH
Inventors: Fritzsche Johannes Ing Dipl
Original assignee: Fritzsche Johannes Ing Dipl
Priority date: 1932-10-07
Filing date: 1932-10-07
Publication date: 1934-01-15
Also published as: ES132056A1

Description

  

      Verfahren    zur Herstellung von     Zündschnüren.       Die Erfindung bezieht sich auf die     Her-          stellung    von Zündschnüren. bestehend aus  schlauchartigem Mantel mit den Hohlraum  ausfüllender     Zündmasseseele    und besonders  auf die Herstellung von langsam brennen  den     Zündschnüren,    sogenannten Sicherheits  zündschnüren.  



  Beim Gebrauch von Zündschnüren emp  findet man es oft als Übelstand, dass das  Zündmittel an den Enden der Zündschnur her  ausfällt. Bei Sicherheitszündschnüren ist -das  besonders deshalb lästig, weil man zur An  zündung die Pulverseele so freilegen muss,  dass man     mit,    einer Flamme die Pulverseele  berühren kann. Bei Zündschnüren mit pul  verartiger     Zündmasseseel.e    ist die Freilegung  der     Zündmasseseele    zwecks     Anzündung    um.       ständlich,    weil die lockere pulverartige Zünd  schnurfüllung dabei leicht herausfällt und  verstreut wird.

   Auch beim Versand der bis  her üblichen Zündschnüre fällt immer reich  lich Zündmasse an den Stirnflächen der  Zündschnüre heraus, und die verstreute       Zündmasse    war eine Gefahrenquelle, die die         Erlassung    besonderer Transportvorschriften  nötig gemacht hat.  



  Die Übelstände werden     vermieden    durch  das erfindungsgemässe Verfahren, welches  den Zweck hat, Zündschnüre mit verfestigter       Zündmittelseele    zu erzeugen. Das Verfahren  beruht darauf, dass man die Zündmasse in  losem, pulverartigen Zustand in     die-Zünd-          schnur    einfüllt und erst     dann,    also erst in  der Zündschnur, die Zündmasse in einen  festeren Zustand überführt.

   Man     verfährt.     hierbei so,     da.ss    man lose,     pulverartige        Zünd-          masse    zunächst in einen dünnen Mantel aus  mindestens einem Streifen staubdichten Ma  terials, zum Beispiel Papier, einhüllt und       dann    erst die     mit    dem Mantel umgebene       Zündmasseseele    mit den bei Zündschnüren  allgemein üblichen Fadenumwicklungen ver  sieht. Es erfolgt ferner erfindungsgemäss  eine zur Verfestigung der Zündmasse füh  rende Behandlung der Seele, welche während  oder nach dem Aufbringen der Fadenumwick  lungen erfolgen kann.

   Diese     Behandlung     kann darin -bestehen, dass die Zündschnur      der     Einwirkung    von Druck, Wärme und  Feuchtigkeit ausgesetzt     wird.    Ob alle drei  Faktoren, nämlich Druck, Wärme und  Feuchtigkeit, angewendet werden und in  welchem Masse, hängt von dem Grade der  gewünschten Verfestigung ab. Man kann  auch nur einen allein oder zwei dieser Fak  toren zusammen anwenden.

   Man kann sich  darauf beschränken, die Verfestigung der in  der Zündschnur eingeschlossenen ursprüng  lich ganz lockeren     Zündmasseseele    nur so  weit zu treiben, dass die einzelnen Partikel  der     Zündmasseseele    so weit zusammen  haftend gemacht werden, dass sie an den       Zündschnurenden    nicht mehr herausfallen,  im übrigen aber die Festigkeit der Seele  unterhalb der     Druckfestigkeit    von 0,5 kg  pro Quadratzentimeter bleibt, gemessen an  aus der fertigen Zündschnur herausgelösten       Zündmasseseelestückchen.        Man        kann    aber  auch die verfestigend wirkende Behandlung  so weit treiben, dass aus der ursprünglich  lockeren,

   pulverartigen Masse in der Zünd  schnur eine feste     Zündmassestange    gebildet  wird. Die Druckfestigkeit solcher     Zünd-          massestangen    lässt sich so weit steigern,     .dass     man die in losem Zustande eingefüllte     Zünd-          masse    an den     Zündschnurenden    in Form einer  festen Stange von mehr als 0,5 kg pro  Quadratzentimeter Druckfestigkeit freilegen  kann.  



  Der die     Zündmittelseele        unmittelbar    um  gebende dünne Mantel aus staubdichtem Ma  terial bezweckt bei der zur Verfestigung der       Zündmittelseele    angewandten Druckeinwir  kung zu verhindern, dass die Zündmasse zwi  schen die Fäden der     Umwicklungslagen    ein  dringt und schützt ausserdem die     Zündmasse     vor Schädigungen, welche durch die Behand  lung mit Wärme und Feuchtigkeit sonst ein  treten     könnten.    Die Behandlung der Zünd  schnur mit Wärme kann in der Weise ge  schehen,

   dass die Zündschnur zwischen heissen  Walzen oder durch heisse Düsen hindurch  geführt     wird.    Druck lässt sich in der Weise  zur Verfestigung der     Zündmasseseele    anwen  den, dass man die     Schnur    durch enge Düsen  zwängt und     die    Schnur einer starken Zug-         spannung    aussetzt. Die Behandlung durch  Feuchtigkeitseinwirkung geschieht am besten  in der Weise,     tlass    man zum Umwickeln der  im dünnen, schlauchartigen Mantel ein  geschlossenen     Zündmasseseele    Garn mit mehr  als<B>3</B>% bis 20% Feuchtigkeitsgehalt an  wendet.  



  Solche Zündmassen, welche keine Nei  gung zeigen, sich durch Druck, Wärme und  Feuchtigkeitseinwirkung zum Zusammen  ballen bringen zu lassen, kann man durch.  Zusätze geeigneter machen. Als Zusätze ver  wendet man vorteilhaft solche Stoffe, die  unter Druck und Wärme plastisch werden  oder unter Feuchtigkeitseinwirkung ver  klebend wirken.

   Das Vorhandensein von  freien Salpeterkörnchen und freien Schwefel  körnchen in der Zündmasse erleichtert die  Zusammenballung der     Zündmasseseele.    Auch  Schwarzpulver in staubförmigem Zustand,  sogenanntes     Mehlpulver,    ist leichter     zusa.m-          menballbar    als das bisher meist zur Sicher  heitszündschnurfüllung     verwendete    gekörnte  Schwarzpulver, und man kann die Zu  sammenballung einer aus Schwarzpulver  bestehenden     Sicherheitszündschnurseele    da  durch erleichtern, dass man das Schwarz  pulver statt in kleinkörniger Form ganz oder  zum Teil, mindestens<B>10%</B> in Staubform, als  sogenanntes Mehlpulver verwendet.  



  Die Bildung der in einen dünnen Strei  fen eingehüllten     Zündmittelseele    kann in der  Weise erfolgen, dass durch ein dem Quer  schnitt der     unverfestigten        Zündmasseseele     entsprechendes Loch ein Streifen aus dün  nem, aber staubdichtem Material hindurch  gezogen wird. Der Streifen hat eine Breite  gleich dreimal dem Lochdurchmesser, und er  wird so durch das Loch hindurchgezogen,  dass er sich dabei rohrähnlich     zusammenbiegt.     Beim Zusammenbiegen läuft der Streifen  durch pulverige Zündmasse hindurch, beladet  sich damit und tritt als schlauchähnlicher,  pulvergefüllter Strang durch das Loch aus.

    Dann wird dieser für sich noch nicht wider  standsfähige     Strang    mit widerstandsfähiger  Umwicklung, aus Fäden bestehend, versehen      und der verfestigend wirkenden Behandlung  unterzogen.  



  Damit n )an beim Vorbereiten der     Zünd-          sehnurenden    für die     Anzündung    die nur mit       (lem    dünnen Innenmantel umgebene     Zünd-          mittelseele    leicht freilegen kann, empfiehlt  e s sich, die in der Regel den dünnen Innen  mantel umgebenden weiteren Mantellagen     aus          Tsoliermasse    nicht mit dem Innenmantel zu       verkleben,    weil sonst die Ablösung der  äussern Lagen erschwert wird.



      Process for the manufacture of fuses. The invention relates to the production of fuses. Consists of a hose-like jacket with a primer mass that fills the cavity and especially the production of slow-burning fuses, so-called safety fuses.



  When using fuses, one often finds it an inconvenience that the primer fails at the ends of the fuse. In the case of safety fuses, this is particularly annoying because to ignite the powder core you have to expose it so that you can touch the powder core with a flame. In the case of fuses with powder-like Zündmasseseel.e, the exposure of the Zündmasseseel for the purpose of ignition is over. Of course, because the loose, powder-like fuse cord filling easily falls out and is scattered.

   Even when shipping the fuses that were customary up to now, there was always a lot of detonating compound falling out of the faces of the detonating cords, and the scattered detonating compound was a source of danger that made it necessary to issue special transport regulations.



  The disadvantages are avoided by the method according to the invention, which has the purpose of producing fuse cords with a solidified fuse core. The method is based on the fact that the detonating compound is poured into the detonating cord in a loose, powder-like state and only then, i.e. only in the detonating cord, is the detonating compound transferred to a more solid state.

   One moves. Here in such a way that loose, powder-like detonating compound is first wrapped in a thin coat of at least one strip of dust-proof material, for example paper, and only then is the priming compound surrounded by the coat seen with the thread wraps generally used in detonating cords. According to the invention there is also a treatment of the core which leads to the solidification of the ignition compound and which can take place during or after the application of the thread wraps.

   This treatment can consist of exposing the detonating cord to the effects of pressure, heat and moisture. Whether all three factors, namely pressure, heat, and humidity, are used, and to what extent, depends on the degree of consolidation desired. One can use just one of these factors alone or two of these factors together.

   One can limit oneself to only pushing the solidification of the primer mass, which was originally quite loose in the fuse, to such an extent that the individual particles of the primer are made to stick together so far that they no longer fall out at the fuse ends, but otherwise the The strength of the core remains below the compressive strength of 0.5 kg per square centimeter, as measured by pieces of primer mass detached from the finished fuse. But you can also take the hardening treatment so far that the originally loose,

   powder-like mass in the ignition cord a solid ignition mass rod is formed. The compressive strength of such detonating mass rods can be increased to such an extent that the detonating mass filled in loose can be exposed at the ends of the detonating cord in the form of a solid rod of more than 0.5 kg per square centimeter of compressive strength.



  The purpose of the thin jacket of dust-proof material immediately surrounding the ignition core is to prevent the ignition compound from penetrating between the threads of the wrapping layers when the pressure is applied to solidify the ignition core and also protects the primer from damage caused by the treatment Otherwise heat and moisture could enter. The treatment of the fuse with heat can be done in the way,

   that the fuse is passed between hot rollers or through hot nozzles. Pressure can be used to solidify the primer mass by forcing the cord through narrow nozzles and subjecting the cord to strong tensile stress. The treatment by the action of moisture is best done in such a way that one uses a closed primer thread with more than 3% to 20% moisture content to wrap the thin, hose-like sheath.



  Such igniting masses, which show no tendency to be brought to agglomeration by pressure, heat and moisture, can be passed through. Make additives more suitable. The additives used are advantageously those substances which become plastic under pressure and heat or have an adhesive effect under the action of moisture.

   The presence of free granules of saltpeter and granules of sulfur in the primer facilitates the agglomeration of the primer. Black powder in a dusty state, so-called flour powder, is easier to ball up than the granular black powder that has hitherto mostly been used to fill safety fuses, and the agglomeration of a black powder safety fuse core can be made easier by using the black powder instead of small-grained ones Form wholly or partially, at least <B> 10% </B> in dust form, used as so-called flour powder.



  The formation of the igniter core encased in a thin strip can take place in such a way that a strip of thin but dustproof material is drawn through a hole corresponding to the cross section of the unconsolidated ignition material core. The width of the strip is three times the diameter of the hole, and it is pulled through the hole in such a way that it bends like a tube. When bent, the strip runs through powdery ignition material, is loaded with it and emerges through the hole as a hose-like, powder-filled strand.

    Then this strand, which is not yet resistant in itself, is provided with a resistant wrapping consisting of threads and subjected to the treatment which has a strengthening effect.



  So that when preparing the ends of the ignition cord for ignition, the ignition core, which is only surrounded by a thin inner jacket, can easily be exposed, it is advisable not to cover the additional layers of insulating compound surrounding the thin inner jacket with the inner jacket stick together, otherwise it will be difficult to remove the outer layers.

Claims

PATENT CLAIM I: Process for the production of ignition cords, consisting of a hose-like jacket with. the ignition mass soul filling the cavity. characterized. that the detonating compound is in a loose, powder-like state (- first wrapped in a thin coat of at least one strip of dust-proof material and then the priming compound surrounded by the thin coat is wrapped with threads and treated with a treatment that leads to the solidification of the priming compound . 1-N TERAN <RTI

ID = "0003.0020"> LANGUAGE 1. Method according to claim I, as characterized by. that the treatment that leads to the consolidation of the soul consists in the action of pressure. Method according to patent claim I, characterized in that the treatment leading to the consolidation of the soul consists in the action of heat. : 9. Method according to patent claim I, because by gekennzc, icbnet that the treatment leading to the solidification of the soul consists in the action of moisture. 1.

Method according to patent claim I, characterized in that the treatment which leads to the solidification of the soul consists in allowing pressure and heat to act on the enveloped soul. Method according to patent claim I, characterized in that the treatment which leads to the consolidation of the core consists in allowing pressure and moisture to act on the wrapped core. (I. The method according to claim I, characterized in that the treatment leading to the solidification of the soul consists in allowing heat and moisture to act on the wrapped soul.

Method according to patent claim I, characterized in that the treatment which leads to the consolidation of the soul consists in allowing pressure, heat and moisture to act on the covered soul. Method according to patent claim I, characterized in that the solidification is only driven so far that the individual ignition material granules are sufficiently connected to one another so as not to fall out at the fuse ends, but otherwise the strength of the core is below the compressive strength of 0, 5 kg per square centimeter remains, measured by pieces of primer mass detached from the finished fuse. 9.

Method according to patent claim I, characterized in that the solidification is carried to such an extent that the individual firing compound granules connect with one another to such an extent that pieces of priming mass detached from the finished fuse have more than 0.5 kg per square centimeter of compressive strength. 10. The method according to claim I, characterized in that ignition material is used which contains more than 10% dust-like black powder. . Method according to patent claim I, characterized in that ignition material is used which contains components which become plastic under pressure and heat.

Method according to patent claim I, characterized in that ignition material is used which contains constituents which act to stick under the action of moisture. 1ä. Method according to patent claim I, characterized in that ignition material is used which contains free salt granules as the solidifying agent. 1.4.

Method according to patent claim 1, characterized in that ignition material is used which contains free sulfur granules as the agent promoting solidification. 15th

Method according to patent claim I, characterized by. that the formation of the igniter core encased in a thin strip takes place in such a way that a strip of thin, dust-tight material with a width equal to about three times the hole diameter is pulled through a hole corresponding to the cross-section of the unsolidified detonator core, so that it bends like a pipe,

and that the strip which is bending together runs through ignition material during the bending together, is loaded with it and exits through the hole as a hose-like, powder-filled strand, in order then to be provided with a resistant wrapping consisting of threads and to be subjected to a hardening treatment.

CLAIM II: Safety fuse, produced by the method according to claim I, consisting of a hose-like jacket with the cavity-filling ignition material soul, characterized in that the granules forming the ignition material have at least one such connection among themselves that they fall out at the ends is made more difficult and that the powder soul is immediately given by a jacket made of a thin, dust-proof strip, over which more, mainly consisting of threads and insulating material layers are arranged.

SUBSTITUTE DISCLAIMERS <B> 16. </B> Safety fuse according to patent claim II, characterized in that the dust-proof strip is made of paper. 17. Safety fuse according to Patent Claim II, characterized in that the further jacket layers surrounding the thin inner jacket formed from dustproof strips with the thin one.

Inner sheath are not glued, so that they can easily be removed so far in order to expose the powder core at the fuse end, which is only covered with the thin inner sheath, that the priming mass core only covered with the thin inner sheath protrudes from the fuse end and is therefore easily ignitable . 18th

Safety fuse according to patent claim II, characterized in that the ignition mass soul is a crumbly ignition mass rod encased in my thin coat of gas-tight strips with a compressive strength of less than 0.5 kg per square centimeter. 19th

Safety fuse according to patent claim II, characterized in that the ignition material core is an ignition material rod encased in a thin jacket of gas-tight strips with a compressive strength of more than 0.5 kg per square centimeter.