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Dry process manufacture of pyrotechnical objects, resulting pyrotechnical objects

A dry process and process technology, which is applied to the dry process of pyrotechnic articles and the field of manufacturing pyrotechnic articles, can solve the problems of long verification time, difficulty, high investment cost and the like of drying steps.

Inactive Publication Date: 2008-06-11
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

Examples

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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. As shown in Figure 1, mixing can be achieved using different devices 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 between ...

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PUM

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Abstract

The present invention relates to a dry process for the manufacture of pyrotechnic objects from at least one reducing charge selected from guanidine derivatives, metal hydrides, alkali metal hydrides and alkaline earth metal hydrides, and at least one oxidizing charge selected from alkali metal nitrates, alkaline earth metal nitrates and basic metal nitrates, at least one of said reducing and oxidizing charges having the property of flowing under stress. Said process makes it possible to obtain pellets and small tablets directly by compaction / compression, to obtain granules, usable as such, by compaction and then granulation, and to obtain compressed objects by compaction, granulation and then compression. The high-performance pyrotechnic objects obtained constitute a further subject of the invention.

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 Applications(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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