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ISO-C1 Entering the Tunnel
The high-grade chemicals are precisely metered and pumped through a mixing system
and nozzle. The combined liquid chemicals are deposited
onto a continuously running lower facer, with
the upper and side facers being fed on line just after the chemical
laydown. As the chemical reaction begins creating heat,
the blowing agent begins to vaporize, initiating the
foaming as the material enters the pressure conveyor.
The foam continues to expand, pushing the facings
against the surfaces of the pressure conveyor which controls
the height and width of the bun. The polyiso bunstock exits the conveyor in a continuous
fashion, and is cut to the appropriate length.
Note: A photo of the "wet end" of the tunnel is not shown due to the proprietary nature of the process.
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