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Reading fluids circuit diagrams - pneumatic circuit examples
The previous articles in this series introduced fluids circuit elements and presented example hydraulic schematics. This article describes two example pneumatic schematic diagrams: winder lowering cradle safety pins and winder belted threader operation.
Insights ● Article
Preventive unwind stand maintenance reduces waste and downtime
The unwind is responsible for several functions in the finishing process, including supercalendering, coating, and rewinding paper into a denser, more stable roll. During operation, it endures constant tension, high speed and vibration, which slowly take their toll. So proper maintenance is essential.
Insights ● Article
Calender safety - Handling calender rolls and parent rolls
Due to the weight and overall size of calender rolls, reel spools, and paper rolls, handling accidents can cause serious injury or death to personnel, and costly repairs to the roll, spool, or other equipment. However, handling accidents can be avoided if basic safety rules are followed.
Insights ● Article
Sizer applicator beam not unloading at sheet break, a case study
When a sizer applicator beam refuses to unload properly, it presents a personnel and equipment safety risk. This case study follows the diagnosis and ultimate identification of the problem - at the TS cylinder rod end packing assembly.
Insights ● Article
Chronic dryer drive oscillation and worn couplings, a case study
The clack-clack-clack noise warned of heavy oscillation in the drive, subjecting the machine to potentially damaging duress. The only known cure was a shutdown and restart, costing the mill productivity and dollars. The shift supervisor calls in a drive technician for assistance...
Insights ● Article
Reel process audits can reduce broke and defects near the spool
Reel equipment can take a beating during normal operation. Periodic inspections of the reel equipment are recommended to develop a baseline with regard to its process variables and mechanical condition.
Insights ● Article
Reduce downtime with press roll maintenance, three case studies
A scheduled service plan guarantees product quality and machine runnability. Case studies show downtime reduction with Valmet press roll scheduled maintenance.
Insights ● Article
Precise head fit prevents uneven loading and excess cover wear
Machine component precision fittings are critical to papermaking success. Commonly misunderstood, head fits are an important part of every roll repair program.
Insights ● Article
SymRoll troubleshooting - leakage, cover wear and vibration
For troublefree function of SymRolls, the following are troubleshooting and maintenance tips and procedures regarding oil leakage, hydraulic and pneumatic systems, roll cover wear, roll vibration and other roll change factors.
Insights ● Article
SAFETY BULLETIN: Precautions to take before refiner maintenance
Valmet has learned of a catastrophic failure of a Valmet Disk Refiner. Excess pressure was used trying to unplug an inlet pipe. No injuries, but much damage.
Insights ● Article
