Very often the hot melt applicators/guns used to apply high temperature polyamides for splices in roofing plants are completely insufficient.

They offer minimal melt rate in the heated pressure tube. They offer minimal output rates as they are only pressurized with air to a maximum of 60 psi. The temperatures are set too high to compensate for their limited melt capacity and they degrade the adhesive.

This affects the bond strength of the adhesive. This type of applicator is also breaking down constantly. Finally, it requires regular filling - exposing operators to high temperature adhesive.
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Fiberglass Gluing in Roofing Plants - by Pierce Covert,
Glue Machinery Corporation
www.gluemachinery.com

Why does hot melt fail to bond corrugated?

There are many reasons why hot melt fails to bond corrugated paper substrates together.

Some of the reasons are as follow:

- In case erecting and sealing improper compression and substantial memory in the board can be the problem.

- During the winter months the temperature of the corrugated may be low enough to set the adhesive too fast.

- Very often the hot melt is the wrong product with the incorrect open time, set time and chemical makeup.

- The use of recycled paperboard can also present a challenge to the bonding process with hot melt adhesives.
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Why does hot melt fail to bond corrugated? - by Pierce Covert,
Glue Machinery Corporation
www.gluemachinery.com