Electrically ignitable caseless propellant charge, the production and use thereof

a propellant charge, electric ignition technology, applied in the direction of nitrated explosive compositions, non-explosive fillers/gelling/thickening agents, explosives, etc., can solve the problems of relatively complex structure of known propellant charges of similar forms, relatively complicated cases, etc., to improve compressibility, improve flow behaviour, and increase storage stability

Inactive Publication Date: 2016-02-18
FISCHERWERKE ARTUR FISCHER GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]It has now been found that it is possible to provide caseless electrically ignitable propellant charges (especially in tablet form) which comprise conductive material in finely divided form in their matrix.
[0044]There can advantageously be added as further additive a (preferably hydrophobic or hydrophobised)—for example pyro-genic or precipitated—silicic acid (optionally with contained silicates, such as aluminium and / or calcium silicates), such as, for example, SIPERNAT® D10 from Evonik Industries AG, Hanau, Germany. The proportion can be, for example, from 0.2 to 3% by weight, for example from 0.3 to 1% by weight. This can give rise to a number of advantages, such as, for example, increased storage stability on account of the hydrophobicity, neutralisation of nitrous acids formed on burning off a propellant charge according to the invention in respect of the pH value, improved flow behaviour and improved compressibility in the production process and / or further improved burn-off behaviour of the propellant charges.

Problems solved by technology

A disadvantage of such devices is the necessity for relatively complicated cases.
Known tablets or propellant charges of similar form accordingly have relatively complex structures.

Method used

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  • Electrically ignitable caseless propellant charge, the production and use thereof
  • Electrically ignitable caseless propellant charge, the production and use thereof

Examples

Experimental program
Comparison scheme
Effect test

example 2

Ignition of a Propellant Charge According to the Invention

[0055]In the case of a tablet 6×6 mm, the energy released after ignition with 100 to 110 volts was about 300 to 350 J.

example 3

Climatised Storage Tests with Propellant Tablets According to the Invention

[0056]Propellant tablets according to the invention were subjected to dry storage at 20° C. and 50% relative humidity until the weight was constant. They could be ignited properly with an ignition voltage of 100-110 volts.

[0057]The following water absorption is observed with a propellant charge from Example 1 at the temperatures and relative humidities indicated:

DaysWatersinceWeightRelativeabsorptionstart ofTime of(g)TemperaturehumidityTablets(% bystorageday5 items° C.(%)Ø mm Xweight)010:001.342047.786.706.000310:001.356549.587.006.001.0847410:071356549.387.006.021.08474 items1.0791509:504 items49.487.106.021.48311.0834610:204 items49.286.606.031.33491.0818709.574 items49.186.906.031.25151.0809

[0058]The propellant tablets are therefore stable towards even elevated humidity and can be stored even at sub-tropical humidities.

example 4

Propellant Charge Containing Carbon Fibres and Silicic Acid

[0059]Propellant charges having the following composition are produced analogously to Example 1:

SubstanceWeight (g)Weight (%)Potassium chlorate36.015.378Manganese(IV) oxide3.6 1.538Carbon fibres (fibre length2.6 1.111average 0.25 to 0.35 mm R&GFaserverbundwerkstoffe GmbH,Waldenbuch, Germany))Alder buckthorn charcoal8.0 3.417(particle size primarily inthe range from 0.02 to0.05 mm)Acrylic granules1 particle4.0 1.709size 200-400 μmZinc peroxide (50-60%)43.018.367Sipernat D1021.5 0.641Nitrocellulose E 3302 with73.031.11835% by weight ethanolIsooctane28.011.960Acetone28.011.960Graphite powder (particle6.4 2.734size predominantly in therange 0.05 to 1 mm)Total:234.1(100)   

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Abstract

Electrically ignitable caseless propellant charge in the form of a caseless propellant tablet (5), characterised in that it is obtainable by mixing together of at least one current-conductive material in dissolved or dispersed form or powder form and graphite in powder form, together with nitrocellulose, with or without addition of further additives, and subsequent compaction to form a propellant tablet, the production and use thereof, and related subject matter of the invention. Uses include: use of the propellant charge in a bolt-driving tool for installing bolts, as an explosive charge in a warning shot device, as a gas-generating element in airbags, for driving cutting devices, for driving pressing devices (for example for squeezing tong-like elements together) or as a propellant charge in small calibre rifles for sporting purposes, or for captive bolt devices for animal slaughtering.

Description

TECHNICAL FIELD OF INVENTION[0001]The invention relates to an electrically ignitable caseless propellant charge (for example for bolt-driving tools or other devices and purposes as described in detail below) in the form of a caseless propellant tablet, or furthermore a tablet-like ignition charge.DISCUSSION OF RELATED ART[0002]Offenlegungsschrift DE 2417967 describes nitrocellulose-based propellant charges suitable for driving-in for fastening purposes, which are provided in cases having two open ends, at one end of which ignition can be effected by means of a spark or a hot wire. Alternatively, ignition can be effected by means of a current through a specially shaped current-conducting case-like metal coating, as described in Auslegeschrift DE 1 300 845.[0003]A disadvantage of such devices is the necessity for relatively complicated cases.[0004]On the other hand, U.S. Pat. No. 3,854,400 describes caseless propellants having a porosity achieved by dissolving out a binder (for exampl...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B25/20C06B29/20
CPCC06B29/20C06B25/20C06B23/001C06B23/007C06B25/18C06B33/00
Inventor HAUG, WILLIZEH, MEINRAD
Owner FISCHERWERKE ARTUR FISCHER GMBH & CO KG
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