| 摘要 |
PROBLEM TO BE SOLVED: To discover a worn place, confirm and grasp the wear condition and wear progressive extent apparently by the naked eye without causing a decrease in abrasion resistance, compression strength and flexibility, and an increase in weight and costs, and also to enable the manufacture using existing manufacturing equipment with high productivity. SOLUTION: A pressure-proof hose 1 for ready-mixed concrete pressure feeding comprises a clamp 3 for connection at the end of a pressure-proof hose body 2 consisting of a laminate of an inside rubber layer 4, a reinforcing layer 5 and an outside rubber layer 6. A topping rubber 5b of inside and outside reinforcing chords 5A and 5B forming the reinforcing layer 5 consists of a coloring agent compounding material such as red, yellow, white, etc., different in hue from the inside rubber layer 4 reinforced with carbon black. COPYRIGHT: (C)2007,JPO&INPIT
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