Rubber Bladder

The JÄGER Group saves lives in seconds with the rubber bladder

Help in seconds

Since the patented „detexline“ extinguishing system, unlike conventional systems, works with just one line, both fire detection and extinguishing take place via this line. During normal operation, the system is depressurized and only becomes active in an emergency. In the event of a fire, however, the extinguishing agent must be able to enter the line precisely from the opening of the stainless steel extinguisher within seconds. For a positionindependent and fast extinguishing process, Jäger Gummi und Kunststoff together with Protecfire developed the so-called rubber bladder.

In case of fire the following happens: The control head in the extinguishing system receives a command and releases the gas pressure cartridge in the bladder. The bladder inflates – starting from the bottom – in the extinguishing agent tank. In this way, the existing extinguishing agent is successfully pressed in one direction towards the extinguishing line, which distributes the extinguishing agent via several nozzles. Therefore it does not matter how the extinguisher is positioned.

Highest demands on an extinguishing system ready for use

The specifications are high: the material must fit the requirements for extinguishing agents and be resistant according to use – at ambient temperatures of -30 °C to +80 °C. The wall thicknesses must be thin so that there is enough space in the extinguisher for the propellant gas cartridge (with nitrogen) and the extinguishing agent, the bladder can be inflated and the expansion during inflation begins evenly from the bottom of the extinguisher. Consequently, the rubber bladder must be reliably manufactured with a constant wall thickness in order to be able to press the extinguishing agent evenly from all sides in the direction of the outlet opening to the extinguishing pipe.

From the right compound to the right tool

Together with its sister company Artemis, Jäger develops a tool concept and a suitable mix. The requirements are high and must be met over a long period of time. The Protecfire system is designed to be maintenance free for ten years and must function at all times in the event of an emergency.

The compounding experts at Jäger Gummi und Kunststoff and Artemis are developing a mixture of extremely elastic natural rubber (NR) and styrene- butadiene rubber (SBR) to meet the required material resistance at sub-zero temperatures. In addition, a threaded metal ring is vulcanized on for the connection to the extinguishing line.

The rubber bladder is manufactured using an injection mold in the injection molding (IM) process. Initially, there are still deviations in the wall thickness, as the core centering cannot be held permanently. Jäger reworks the tool immediately and subsequently realizes reliable core centering. Now the product is perfect – it can be delivered to Protecfire.

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