| 摘要 |
PROBLEM TO BE SOLVED: To provide a pumping tube (rubber tube) enabling the setting of performances according to requested performances different for each longitudinal position of the tube. SOLUTION: The longitudinal center portion of the pumping tube 1 is curved along the inner peripheral surface of a pump case 5 to form a curved part 6. A roller 13 rollingly presses the curved part 6 to feed a slurry. The longitudinal both ends of the tube are extended from the inside to the outside of the pump case 5 to form an intake part 8 and a delivery part 9. The hardness (Hs) of inner layer rubbers 2 at the intake part 8 and the delivery part 9 is set higher than the hardness (Hs) of the curved part 6 within the range of 10 to 30. Thus, the rigidities of the intake part 8 and the delivery part 9 can be increased while increasing the performances of the curved part 6 such as flexibility, bending fatigue resistance, and wear resistance. COPYRIGHT: (C)2005,JPO&NCIPI
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