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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