EP0051881B1 - Procédé de production en continu d'une poudre simple base - Google Patents

Procédé de production en continu d'une poudre simple base Download PDF

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Publication number
EP0051881B1
EP0051881B1 EP81109638A EP81109638A EP0051881B1 EP 0051881 B1 EP0051881 B1 EP 0051881B1 EP 81109638 A EP81109638 A EP 81109638A EP 81109638 A EP81109638 A EP 81109638A EP 0051881 B1 EP0051881 B1 EP 0051881B1
Authority
EP
European Patent Office
Prior art keywords
nitrocellulose
screw
screw press
solvent
mixing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81109638A
Other languages
German (de)
English (en)
Other versions
EP0051881A1 (fr
Inventor
Peter Dr. Presinger
Gregor Dipl.-Ing. Stockmann
Alfred Jeck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WNC Nitrochemie GmbH
Original Assignee
WNC Nitrochemie GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6116601&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0051881(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by WNC Nitrochemie GmbH filed Critical WNC Nitrochemie GmbH
Priority to AT81109638T priority Critical patent/ATE6855T1/de
Publication of EP0051881A1 publication Critical patent/EP0051881A1/fr
Application granted granted Critical
Publication of EP0051881B1 publication Critical patent/EP0051881B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/0075—Shaping the mixture by extrusion

Definitions

  • the invention relates to a process for the continuous production of single-base powder by means of a twin-screw screw press, in which solvent-moist nitrocellulose is introduced into a feed zone of the screw press, mixed in subsequent mixing and kneading zones of the screw press with added solvent and, if appropriate, further additives and thereby gelatinized and at the discharge end of the Screw press is extruded in the form of a strand.
  • FR-A-11 99918 also discloses a method for producing powders based on nitrocellulose or other powder base bodies using a twin-screw extruder.
  • the nitrocellulose and other additives are each brought together via a metering device and then jointly introduced into a first zone of the screw press equipped with kneading elements, where they are mixed further.
  • the first zone is followed by a displacement or separation zone defined by screw elements and another kneading zone defined by kneading elements, in which further additives, e.g. Solvent into which the screw press can be inserted before the gelatinized nitrocellulose mass is extruded at the discharge end of the screw press.
  • the object of the invention is to design the method mentioned in the introduction in such a way that blockages of the screw press by nitrocellulose are avoided.
  • the solvent is added, e.g. Alcohol, separated from the nitrocellulose, at a point on the screw press that follows the feed zone used exclusively for the supply of the nitrocellulose.
  • the screw press or its mixing and kneading screws are designed so that the solvent in a mixing zone, i.e. no kneading zone, comes together with the nitrocellulose already in the screw press and the first kneading zone of the screw press follows this mixing zone.
  • the invention achieves an uninterrupted and, in addition, process sequence so uniform that a high-quality product is obtained which is practically free of quality fluctuations.
  • the components of the powder to be prepared are expediently metered in in a manner known per se.
  • a dosing pump is appropriate for the solvent.
  • the nitrocellulose is advantageously input using a metering screw.
  • a device for the continuous production of single-base powder as main unit comprises a twin-screw screw press 1 of a type known in principle, in which two mixing and kneading screws 2 (only one of the two is shown in the figures) lying in the same direction in FIG turn a screw housing 3 which is eight-shaped in cross section and has a double jacket for temperature control purposes.
  • the two mixing and kneading screws 2 are composed of screw elements 4 with a box profile, screw elements 5 with a rounded profile and disk-shaped kneading elements 6, which are mounted on two screw shafts 7, in a specific configuration adapted to the production process.
  • the screw housing 3 Above the initial section of the mixing and kneading screws 2, the screw housing 3 has a large filling opening 8.
  • the end of the screw housing is closed off by a die arrangement 9, which is only indicated schematically in FIG.
  • the screw elements 4 with a box profile sit on the screw shafts 7.
  • a feed zone E of the screw press that is open through the filling opening.
  • screw elements 5 sit on the screw shafts and define a first mixing zone Me of the screw press there.
  • kneading elements 6 on the screw shafts which define a first kneading zone Ke.
  • further mixing zones Mi which are, however, significantly shorter than the first mixing zone Me
  • further kneading zones Ki which are defined by screw elements 5 or kneading elements 6.
  • the last kneading zone is followed by a comparatively long pressure zone D, likewise defined by screw elements 5, which extends up to the die arrangement 9.
  • a metering device 10 for nitrocellulose is assigned to the filling opening 8. This comprises a feed hopper 11, to which a metering screw 12 connects, which in turn opens into a vertical chute 13 extending into the filling opening 7.
  • a metering device 20 for solvents which comprises a storage container 21 and a metering pump 22 connected to it.
  • a line 23 leading away from the metering pump ends in the region of the first mixing zone Me in the interior of the screw housing 3, specifically cf. Figure 2, approximately at the end of the first third of its longitudinal extension in the working direction.
  • the hopper 11 is loaded with solvent-moist nitrocellulose, e.g. with so-called press-displaced nitrocellulose, the water content of which has been replaced by solvents in the press.
  • the reservoir 21 is filled with solvent, e.g. Filled with acetone.
  • the nitrocellulose is drawn off in metered quantity from the feed hopper 11 by means of the metering screw 12 and is fed into the feed zone E of the screw press via the chute 13.
  • the dosing is carried out in such a way that the screw press works with relining at least in the feed zone.
  • the screw elements 4 in the area of the feed zone E convey the nitrocellulose that has fallen in to the subsequent first mixing zone Me.
  • the solvent supplied continuously under pressure by means of the metering pump 22 is added to the nitrocellulose and mixed with the nitrocellulose in the axial direction while conveying the same.
  • This now highly solvent-moist mixture reaches the first kneading zone Ke, is kneaded there under shear stress and moves on through the subsequent mixing and kneading zones Mi or Ki to the discharge end of the screw press, the mixture being gelatinized.
  • the screw elements in the pressure zone D at the end the gelatinized mixture is pressed through the matrix arrangement 9, i.e. extruded in strand form.
  • the extruded strands can then be processed to the finished powder in a known manner by cutting, drying and possibly post-processing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Ceramic Products (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Claims (5)

1. Procédé pour la fabrication continue d'une poudre monobasique au moyen d'une presse à vis à deux arbres, suivant lequel de la nitrocellulose humidifiée par un solvant est introduite dans une zone d'admission de la presse à vis et mélangée dans des zones suivantes de mélange et de pétrissage de la presse avec du solvant introduit et le cas échéant avec d'autres matières d'addition est ainsi rendue gélatineuse, est extrudée sous forme de joncs l'extrémité de décharge de la presse à vis, caractérisé en ce que le solvant est ajouté à la nitrocellulose exclusivement dans une zone de mélange (Me) placée à la suite de la zone d'admission ouverte (E).
2. Procédé selon la revendication 1, caractérisé en ce que le solvant est ajouté au moyen d'une pompe de dosage (22).
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que la nitrocellulose est introduite au moyen d'une vis sans fin de dosage (12).
4. Procédé selon la revendication 3, caractérisé en ce que la nitrocellulose est dosée en vue d'une sous-alimentation d'au moins la zone d'admission (E) de la presse à vis sans fin (1 ).
5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la nitrocellulose est introduite dans une zone d'admission (E) définie par des éléments de vis (4) à profil en caisson.
EP81109638A 1980-11-12 1981-11-11 Procédé de production en continu d'une poudre simple base Expired EP0051881B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109638T ATE6855T1 (de) 1980-11-12 1981-11-11 Verfahren zum kontinuierlichen herstellen einbasiger pulver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3042697 1980-11-12
DE3042697A DE3042697C2 (de) 1980-11-12 1980-11-12 Verfahren zum kontinuierlichen Herstellen einbasiger Pulver

Publications (2)

Publication Number Publication Date
EP0051881A1 EP0051881A1 (fr) 1982-05-19
EP0051881B1 true EP0051881B1 (fr) 1984-03-28

Family

ID=6116601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109638A Expired EP0051881B1 (fr) 1980-11-12 1981-11-11 Procédé de production en continu d'une poudre simple base

Country Status (4)

Country Link
EP (1) EP0051881B1 (fr)
AT (1) ATE6855T1 (fr)
DE (1) DE3042697C2 (fr)
ES (1) ES8300312A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2031517C (fr) * 1989-05-11 1999-08-24 Klaus-Dieter Mogendorf Methode de preparation de poudre propulsive tribasique eet appareil connexe
GB2258656B (en) * 1991-08-15 1994-01-12 Albright & Wilson Processing of powder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1048212B (de) * 1957-08-09 1958-12-31 Dynamit Nobel Ag Vorrichtung zur kontinuierlichen Herstellung von Schiesspulvern und Treibsaetzen
GB1283265A (en) * 1969-05-26 1972-07-26 Seikisui Chemical Co Ltd Process for the extrusion of a homogeneous mixture of a thermoplastic material with a liquid
FR2325491A1 (fr) * 1975-09-25 1977-04-22 Poudres & Explosifs Ste Nale Procede de boudinage des compositions pyrotechniques, et boudineuse a vis
FR2326289A1 (fr) * 1975-10-01 1977-04-29 Poudres & Explosifs Ste Nale Boudineuse a fourreau ouvrable
DE2825567B1 (de) * 1978-06-10 1979-11-15 Dynamit Nobel Ag Verfahren zur kontinuierlichen Herstellung von Explosivstoffgemischen

Also Published As

Publication number Publication date
DE3042697C2 (de) 1986-02-20
ES507083A0 (es) 1982-11-01
ATE6855T1 (de) 1984-04-15
ES8300312A1 (es) 1982-11-01
EP0051881A1 (fr) 1982-05-19
DE3042697A1 (de) 1982-06-03

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