| 摘要 |
PURPOSE:To improve the recovery of the cross section shape of an elastic tube and the slurry shifting efficiency by providing pressing rollers which push back the inner periphery side bulged section of the elastic tube generated by a squeeze of a squeezing roller to the inside of this tube near the squeezing roller. CONSTITUTION:Pressing rollers 25 which press the inner peripheral side bulged section P of an elastic tube 14 generated by a squeeze of a squeezing roller 7 to push back the tube 14 inward is provided near the squeezing roller 7. Thereby, the pressing rollers 25 are revolved and rotated in relation with the revolution and rotation of the squeezing roller 7, and the inner periphery side bulged section P of the elastic tube 14 bulged to the inner periphery side of the squeezing roller 7 is pushed back to the inside of the tube 14. Accordingly, aggregates hardly enter a corner section 14b in the elastic tube 14 in front of the squeezing roller 7 and are easily pushed out of it when entering it and are hardly bitten, thus the slurry shifting efficiency is improved. In addition, the recovery action of the cross section shape of the elastic tube 14 is improved.
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