Heating module for upper web surface in a double backer
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
Aug 29, 1996
filing date -
Aug 29, 1996
priority date (Note) -
Expired
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Abstract
An apparatus for curing the web bonding adhesive and drying the corrugated paperboard web utilizes a top heating module contacting the upper face surface of the paperboard web for simultaneously heating the paperboard web along with a series of lower heating units. The top heating module includes of a series of internal heating elements. The heating elements are preferably tubes which receive a supply heated gas or liquid and transfer the heat contained therein to a heat exchange fluid within the module. The heat from the heat exchange fluid is then transferred to the paperboard web through a web-conforming contact member. As the paper-board passes through the double backer, the combination of the top heating module and the lower heating units cure the adhesive bonds in the paperboard web. The web-conforming contact member preferably comprises a thin metal membrane and the heat exchange fluid is a liquid. Heat transfer and uniform contact is achieved by hydrostatic pressure of the liquid acting through the membrane against the web.
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