Plastic Pipes Conference Association # 2021 Amsterdam
Yoshikatsu NISHIDA, Yukihisa YAMADA, Masaya IWASAKI, Masaru TOMOBE, Yuichi KOUGA
By using polyethylene as the main material for this fire extinguishing device pipe, a resin-made fire extinguishing device is developed that is maintenance-free for eight years and can cope with the abnormal heat generation of lithium ion batteries. In order to prevent the internal extinguishant from permeating and being lost during long-term use, the pipe structure for this fire extinguishing device was made to be a multi-layer structure (PE80/AD *1 /EVOH/AD *1 /PE80). And, by forming the fire extinguishing device into the shape of the pipe, the extinguishant opening was formed into a beak-like shape to allow the evaporated extinguishant can be diffused widely. One of the examination item of Underwriters Laboratories Inc. (hereinafter referred to as a "UL") demands that the amount of permeation of fire extinguishing agent is as small as the weight change of a metal container. This fire extinguishing device pipe is caused by moisture a much greater weight change than ordinary polyethylene pipes. As such this fire extinguishing device has been certified due to be proved the relationship between the permeation of extinguishing agent and the change in weight. As a result of the above, this fire extinguishing device was the first self-contained automatic extinguisher unit in the world to obtain UL certification. (UL No. EX26912) *1 ‘’AD’’ stands for the adhesive layer.
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