AIR-CONDITIONING FLEXIBLE DUCT AND METHOD FOR MANUFACTURING THE SAME

• Main Authors: SAITO KIWAMU, MURATA TAKATOMO, OKAMOTO MAMORU
• Format: Patent
• Language: English; Japanese
• Published: 29.03.2023
• Subjects: AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING; BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; RANGES; VENTILATING; WEAPONS

To securely suppress generation of a large pleat on an inner surface material in a bent portion of an air-conditioning flexible duct by using simple and inexpensive means and reduce pressure loss.SOLUTION: A spirally cylindrical inner surface material 12 is formed by spirally winding a core material 11 and spirally winding and stretching between pitches of the core material 11 a non-woven fabric or resin film band material 15. An air-conditioning flexible duct 1 is manufactured by coating an outer periphery of the inner surface material 12 with a soft heat insulating layer 13. Before the coating process, a spiral band-shaped hot melt adhesive layer 16 is formed by applying a hot melt adhesive 16a with constant width W16 to an intermediate part in the width direction of the band material 15.SELECTED DRAWING: Figure 3 【課題】空調用フレキシブルダクトの曲げ部分における内面材に大きなヒダが出来るのを簡易かつ安価な手段で確実に抑制し、圧力損失を低減する。【解決手段】芯材１１を螺旋状に巻回するとともに、不織布又は樹脂フィルムの帯材１５を螺旋状に巻いて芯材１１のピッチ間に張り渡して螺旋筒状の内面材１２を成形する。内面材１２の外周を軟質断熱層１３にて被覆することによって、空調用フレキシブルダクト１を製造する。前記被覆工程の前に、帯材１５の幅方向の中間部に一定幅Ｗ１６のホットメルト接着剤１６ａを塗布することによって螺旋帯状のホットメルト接着剤層１６を形成する。【選択図】図３