Pre-conditioning of a medium web during the fabrication of corrugated paperboard
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United States of America Patent
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Jul 18, 2000
Grant Date -
N/A
app pub date -
Jun 1, 1998
filing date -
Jun 1, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for preconditioning a medium web on a corragator before fluting the medium web during the manufacturing process of corrugated paperboard uses steam flows and pressures to press the medium web against a hot plate assembly. A plurality of elongated steam showers are located within a steam chamber secured to the preconditioning apparatus. The steam chamber wall structure includes a sealed web inlet and sealed web outlet for the medium web. The velocity and pressure (e.g., average steam pressure within steam chamber approximately 0.1 to 0.3 psi) of steam injected into the steam chamber holds the medium web against hot plates to promote heat transfer from the hot plates to the medium web. In addition, the medium web is heated directly by the latent heat of steam condensation, and also moistened directly by the condensation of the steam. A vacuum may or may not be used to increase the pressure of the medium web against the hot plates.
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