Internal Heat Generation in the Elastic Roll of High Speed_Super Calender

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Other Title
  • 高速スーパーカレンダー用弾性ロールの内部発熱
  • コウソク スーパーカレンダーヨウ ダンセイ ロール ノ ナイブ ハツネツ ニ

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Description

As paper machine speed increases, that of the super calenders is also getting higher. Internal heat generation of the elastic rolls accordingly increases and that causes bad effect to the final sheet quality by roll vibration swelling, many burning accidents of elastic covers and difficulty of roll maintenance, all of which cannot be ever overlooked. This report calculated the internal heat generation theoretically, and calculated the internal beat generation of actually operated super calender of 3, 400mm roll face length and 500m/min operating speed by theoretical formula.<BR>Secondly this report measured the total driving power consumption and compared the both figures. The result was that the former (65kW) occupies one fourth of the latter (250kW) and that this amount cannot be neglected.<BR>On the contrary the total driving power consumption of the 4 or 8 roll machine calender of 3, 400mm face length and 500m/min operating speed is only about 50kW, as shown in Fig. 5. This fact also shows that the former mentioned internal heat generation reaches upto relatively large amount.<BR>So far the designing of the elastic rolls employed the conceptional try and error method from the experiences, however above results shows that the elastic rolls of super calender shall furnish following features and the investigation of the elastic roll shall be directed to the same direction hereafter.<BR>(1) The elastic rolls shall have same character in every direction to keep the heat swelling evenly.<BR>(2) The cover material shall have the big heat conductivity to discharge generated internal heat immediately.<BR>(3) The cover material shall have heat proofness to prevent from burning down.<BR>(4) The crown of the elastic rolls shall be kept adequately.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 29 (3), 113-126, 1975

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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