Process for monitoring web breaks

A process for monitoring web breaks in a machine for producing a material web that includes at least one impingement dryer, said process comprising:

• guiding the material web through the at least one impingement dryer:
• monitoring the material web for web breaks in at least one of a region, viewed in a web travel direction, before an intake into the at least one impingement dryer, after an exit from the at least one impingement dryer and within the at least one impingement dryer;
• and
• at least partially deactivating the at least one impingement dryer when a web break is detected,
• wherein at least one impingement dryer comprises at least one impingement hood, and, when a web break is detected, the at least one impingement hood is deactivated, and
• wherein the deactivation of the at least one impingement hood comprises reversing operational states of the at least one impingement hood from a normal operational state, in which the material web is impinged with at least one of hot air and hot steam, to a web break operational state, in which the material web is impinged with at least one of hood-internal hot air and hot steam impingement.

A process for monitoring web breaks in a machine for producing a material web that includes at least one impingement dryer, said process comprising:

• guiding the material web through the at least one impingement dryer;
• monitoring the material web for web breaks in at least one of a region, viewed in a web travel direction, before an intake into the at least one impingement dryer, after an exit from the at least one impingement dryer and within the at least one impingement dryer;
• and
• at least partially deactivating the at least one impingement dryer when a web break is detected,
• wherein at least one impingement dryer comprises at least one impingement hood, and, when a web break is detected, the at least one impingement hood is deactivated, and
• wherein the at least one impingement hood is deactivated by switching a burner assigned to the at least one impingement hood to minimum capacity.

A process for monitoring web breaks in a machine for producing a material web that includes at least one impingement dryer, said process comprising:

• guiding the material web through the at least one impingement dryer;
• monitoring the material web for web breaks in at least one of a region, viewed in a web travel direction, before an intake into the at least one impingement dryer, after an exit from the at least one impingement dryer and within the at least one impingement dryer;
• and
• at least partially deactivating the at least one impingement dryer when a web break is detected,
• wherein the monitoring of the material web for web breaks comprises at least one of monitoring the material web with at least one optical sensor and at least one camera.

A process for monitoring web breaks in a machine for producing a material web that includes at least one impingement dryer, said process comprising:

• guiding the material web through the at least one impingement dryer;
• monitoring the material web for web breaks in at least one of a region, viewed in a web travel direction, before an intake into the at least one impingement dryer, after an exit from the at least one impingement dryer and within the at least one impingement dryer;
• and
• at least partially deactivating the at least one impingement dryer when a web break is detected,
• wherein the at least one impingement dryer comprises a suctioned roll and a suction roll is arranged after the at least one impingement dryer, and the web breaks are monitored by monitoring a vacuum of at least one of the suctioned roll and the suction roll.