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Methods of manufacturing monolithic gas generant grains

A gas generating agent and gas generation technology, which are applied in the production of compressed gas, extrusion of molds and granulation, explosives, etc., can solve the problem that passengers cannot get the benefits of airbags.

Active Publication Date: 2010-01-06
AUTOLIV ASP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the pressure rate in the airbag increases too fast, the gas generant will generate too much pressure, and the occupants who are out of their seats may not get the benefits of the airbag

Method used

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  • Methods of manufacturing monolithic gas generant grains
  • Methods of manufacturing monolithic gas generant grains
  • Methods of manufacturing monolithic gas generant grains

Examples

Experimental program
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Embodiment 1

[0080] In one example, a coolant (basic copper carbonate) was dry blended with the spray dried gas generant composition. The blended powder is then compacted by rolling or soft stamping on a rotary pharmaceutical compactor. The mixed powder is compacted by applying a pressure of at least about 40,000 psig (about 275 MPa), and then pelletized to increase its bulk density to achieve proper die filling. Through this procedure, the bulk density is increased to between about 0.75 and about 1.75 g / cc. These pre-pressed powders are then mixed with a release agent such as graphite and placed in a pre-forming die of the desired shape, e.g. Figure 6 An annular disk shape with many holes is shown. The die and powder are placed in a large high tonnage hydraulic press that can exert over 50 tons of force. The raw material is stamped to form a monolithic gas generant solid.

[0081] Various aspects of the present disclosure provide methods of manufacturing monolithic gas generant parti...

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PUM

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Abstract

Methods for making a pressed monolithic gas generant for an inflatable restraint device (for example, an airbag system for a vehicle) are provided. The methods include admixing a gas generant material with a ballistic performance modifier to form a mixture. The mixture is granulated. Then, a pressed monolithic gas generant grain is formed by applying pressure to the granulated mixture, where the grain has an actual density of at least about 95% of the maximum theoretical density. The pressure may be applied in a controlled manner to both side of the gas generant material in a die cavity, and removing formed grain from die cavity while maintaining some pressure to both sides of the grain, thereby further improving various pyrotechnic properties. The methods of the disclosure provide pyrotechnic compositions that are economical to manufacture, have improved burn rate, combustion profile, effluent quality, strength, durability, and integrity of the grain, while having a consistent shape between different production lots.

Description

technical field [0001] The present disclosure relates to inflatable restraint systems, and further to methods of making pyrotechnic gas generating materials for use in such systems. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Passive inflatable restraint systems are often used in a variety of applications, such as in motor vehicles. When the vehicle slows down due to a collision, an inflatable restraint system deploys an airbag cushion to prevent occupants from contact with the vehicle, thus minimizing occupant injuries. Such devices typically use a gas generator comprising a pyrotechnic gas generating agent. The gas generating agent burns rapidly to generate hot gas to inflate the airbag, thereby restricting the position of the occupants relative to the vehicle. [0004] The vehicle occupant may not be in a predetermined position for maximum...

Claims

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Application Information

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IPC IPC(8): C06B21/00C06B45/00C06D5/06
CPCC06B45/00B01J2/22C06D5/06C06B21/0041
Inventor 罗杰·布雷德福德托马斯·克罗宁伊万·门登霍尔布雷特·赫西
Owner AUTOLIV ASP INC
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