Cardboard foaming at startup
After the single-faced machine was stopped for a period of time, a temporary non-circular appearance on the lower corrugating roller or pressure roller caused spheroidal foaming. After the machine restarts for a while, blistering disappears.
the reason
a. Condensate accumulates in the lower corrugated roll or pressure roll
b. Deformation measures of the lower corrugating roller when the vacuum system of the lower corrugating roller is not heated or the vacuum chamber of the lower corrugating roller is used to obtain a vacuum effect
a. Check the siphon Check the pressure difference between the steam inlet and the return line. The minimum differential pressure during normal operation must not be less than 5 psi.
b. Minimizing the number of shutdowns is considered to disengage the upper corrugating roller and the lower corrugating roller and allow them to idle when they are stopped. If possible, reinstall the heated corrugating roller. If the consumption of the following method is lower than that when the lower corrugated roller is started under cooling, consider cutting the core paper and let the single-faced machine idle until it reaches the uniform temperature, then reload the core paper and start it.