The leakage airflow is almost "zero" for the positive pressure duct "Non-Leak Duct." For negative pressure duct used in high-pressure ventilation systems such as long-distance shields, "Pita Joint Duct."
■ Non-Leak Duct (Positive Pressure Use) ● Non-Leak Duct (Packing Type) (Patent Application No. 2015-38261) Measured value φ2500 at 8kPa with a maximum leakage rate of 0.1m³/min (per one fastening connection point) Available in φ800 to φ2500, standard length of 10m ● Small Diameter Non-Leak Duct (Patent No. 4917069) This is a duct for positive pressure use. Air leakage is almost zero. With a leakage rate of 1/3700 compared to conventional ducts, it is an excellent air duct for long-distance small cross-section shield and tunnel ventilation. Available in φ300 to φ700, standard length of 10m ■ Pita Joint Duct (Negative Pressure Use) This is a duct for negative pressure use. Air leakage is almost zero even at -80kPa. With low friction resistance and good long-distance air delivery characteristics, it enables significant energy savings and allows for a smaller blower size. Compared to conventional steel pipes, the outer diameter of the joint section is smaller, allowing for space-saving installation. It offers excellent cost performance for methane gas exhaust, long-distance shields, small cross-section tunnel mechanical excavation, TBM, and more.
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Our company develops environmental equipment primarily focused on the purification of air, water, and soil. We have strengths in devices centered around filter technology for dust collection, deodorization, dehumidification, and turbid water purification, with a strong track record in tunnels, steel mills, and measures against dioxins, VOCs, and asbestos. We are also involved in the purification of work environments as well as in nanoparticle processes in precision metallurgy, chemistry, and pharmaceuticals. Recently, we have been focusing on disaster recovery, decontamination projects, and water treatment and wastewater treatment. 【Recent Awards】 2019 - Excellent Entrepreneur Award from Nikkan Kogyo Shimbun - Special Award from the Woman Empowerment Award - Director-General's Award from the Ministry of Economy, Trade and Industry for the "Excellent Environmental Equipment Award" 2020 - Chairman's Award from the Japan Society of Industrial Machinery Manufacturers for the "Excellent Environmental Equipment Award" - Certification as a Work-Life Balance Promoting Company in Minato Ward - Corporate Value Certification - Global Niche Top Company by the Ministry of Economy, Trade and Industry 2021 - Grand Prize at the Invention Awards - Environmental Management Award - One of the "300 Flourishing Small and Medium Enterprises" 2022 - Tokyo Metropolitan Government Commendation for Meritorious Service (for Contributions to Technological Advancement)