Corrugated board manufacturing apparatus including a preheater section with a variable heat transfer system and a hotplate section with a passive hold-down mechanisim
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United States of America Patent
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May 21, 2002
Grant Date -
May 2, 2002
app pub date -
Nov 30, 1998
filing date -
Nov 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A variable heat transfer system and a passive, segmented hold-down mechanism for a preheater section and a hotplate section of a machine for manufacturing corrugated board. The preheater assembly having the variable heat transfer system includes a plurality of actuators to urge a continuous web of material toward a preheater drum. A sacrificial material is positioned between the web of material on the preheater drum and the actuators. In response to moisture detection in the material by a plurality of sensors, one or more of the actuators applies variable pressure in the cross-machine direction to the wet portion of the material. Also, the passive, segmented hold-down mechanism includes a plurality of independently weighted feet for varying a variable pressure profile in the cross-machine direction formed upon the web of corrugated board. The hold-down mechanism compensates for variations in the contour of the surface of the hotplate section.
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