Cardboard defects caused by single-sided and double-sided machines (5)

Cardboard foaming at startup

After the single-sided machine was stopped for a period of time, a temporary non-round condition on the lower corrugating roller or pressure roller caused a spherical blistering on the cardboard. After the machine restarts for a while, blistering disappears.

the reason

Condensate deposits in the lower corrugating roll or pressure roll

The vacuum system when the lower corrugating roller is not heated, or

The vacuum chamber on the lower corrugating roller is used to obtain the vacuum

When effect, cause the deformation of the lower corrugated roller

Measure

Check the siphon and look for condensation in the steam drum

Deposition

Check the pressure difference between the steam inlet pipe and the return pipe,

The minimum pressure difference during normal operation must not be less than 5 lbs/sq.

Minimize stoppages to a minimum

Consider removing the upper corrugating roller and the lower corrugating roller and

Stop running to make it idle. If possible, reheat

After the corrugated roller. If the following method consumes less than the lower tile

Less consumption of starter rolls when starting under cooling, consider

Cut the core paper and make the single-faced machine idle until it reaches an even temperature.

Then reinstall the core paper and start

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