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Dry process manufacture of pyrotechnical objects, resulting pyrotechnical objects

A process, pyrotechnic technology, applied in the direction of compressed gas generation, ignition device, explosive processing equipment, etc., can solve the problems of high investment cost, long drying step verification time, adverse impact on production, etc.

Inactive Publication Date: 2012-03-28
ARIANEGRP SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these methods require a drying step which has proven to be lengthy and difficult
The presence of this step has a detrimental effect on yield and also entails high investment costs

Method used

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  • Dry process manufacture of pyrotechnical objects, resulting pyrotechnical objects
  • Dry process manufacture of pyrotechnical objects, resulting pyrotechnical objects
  • Dry process manufacture of pyrotechnical objects, resulting pyrotechnical objects

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Embodiment Construction

[0068] The manufacturing process according to the invention comprises a step 1 for mixing the raw materials forming the composition. Such as figure 1 As shown, mixing can be achieved using different equipment known in the state of the art. Said mixing can be achieved by means of a "rotator" 10 , a convective screw stirrer 11 , or a convective paddle stirrer 12 , for example. According to the invention, the ingredients are dry mixed.

[0069] Next, the resulting mixture is subjected to a compaction step 2 and optionally a granulation step 2bis. According to the invention, this granulation step is achieved by a dry process, ie without the use of solvents. The mixture in powder form is first sprayed into a compactor 20 for a compaction step. Ejection of the material in the forward direction S is achieved, for example, using a screw system 13 open in the compactor 20 . The compactor 20 is in the form of two rollers 200, 201 arranged in parallel and spaced apart leaving a gap ...

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Abstract

The invention concerns a method for dry process manufacturing of pyrotechnical objects from at least one reducing filler selected among guanidine derivatives, metal hydrides, alkaline or alkaline-earth metal hydrides and at least one oxidizing filler selected among alkaline metal nitrates, alkaline-earth metal nitrates of basic metals; at least one of said reducing and oxidizing filler(s) having creeping property. Said method enables pellets and small balls to be directly obtained by compacting / compression; granules, useable as such, to be obtained by compacting followed by granulation; compressed objects to be obtained by compacting, granulating followed by compression. The invention also concerns the resulting efficient pyrotechnical objects.

Description

technical field [0001] The present invention relates to the technical field of pyrotechnic articles, in particular to the technical field of pyrotechnic articles used in the field of motor vehicle safety, such as gas generators for airbags. The invention more particularly relates to a dry process for the manufacture of pyrotechnic articles, in particular for use in the field of motor vehicle safety. The invention also relates to said objects and uses thereof which are novel in themselves. Background technique [0002] The manufacturing process of pyrotechnic articles is known in the art and comprises a kneading step, an extrusion step by means of a twin-screw extruder and a step for chopping the rod obtained after extrusion. Such a manufacturing process is described, for example, in French patent application No. 2 779 426 . However, this process cannot be used for all types of pyrotechnic compositions. Indeed, when the composition contains large amounts of charges such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J2/22C06D5/00C06B21/00
CPCC06C9/00C06B21/0041C06B21/0066C06D5/06C06B21/00C06D5/00B01J2/22
Inventor 玛丽·戈德雷埃里克·吉罗迪米特里·沙雷特
Owner ARIANEGRP SAS
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