Headbox Services

Alignment Services

Nip Test and Tuning

On-Site Grinding and Coating

Tail Threading

Fabric Cleaner

Water Jet Tail Cutter

Water Jet Turn-Up

 

Superfinishing Machine

Superfinishing equipment

On-Site SF Machine

 

Actuator and Microadjuster

blade angle meter

 

Blade Angle Meter

blade angle meter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Headbox Services

The headbox performance shows significant role in making a good quality of products. Maintaining and improving headbox performance is thus very important and by maintaining the headbox performance, you can get some benefit for e.g.

Headbox Condition Test

jet impingement

Headox performance check-up by PMPRO specialists to reveal;

  • existing slice opening profile in related to the paper profiles
  • change, deformation and damage of the top and bottom lips
  • headbox alignment and control of the jet impingement
  • functioning of the slice control system
  • general condition and cleanliness of the slice flow surfaces
  • spare parts needed for headbox reconditioning

Headbox conditon test takes 12-14 hours shutdown. The slice opening is zeroed after the test.

 

Headbox Reconditioning

apron grindingheadbox inside polishing

Beased on headbox testing result, the headbox reconditioning and the time-need for the actions are verified. Typical scope of headbox reconditioning are for example;

  • apron recondition by grinding and polishing
  • headbox realignment
  • still chamber polishing
  • realignment of top slice beam relative to apron
  • replacement of top slice lip and its end seal
  • changing of seals at side walls
  • polishing of side wall flow surface
  • checking of side wall end clearances and adjusted
  • surface coating by non-stick polymer solutions
  • realignment of breast roll and forming board

The shutdown need for headbox reconditioning is approx 2-3 days. Combining testing and reconditioning to one visit is also possible.

Headbox Coating

headbox coating

Target of the service is to remove all dirtiness and hard scale then coating with non-stick polymer solution. The coating will ease of the cleaning of the headbox flow surface. Non-stick polymer will leave un-noticeable thin film on surface. This coating will form low surface energy film making the surface hydrophobic and better dirt repellant. Before coating headbox flow surface chemical resistance property will be improved by recovering of Chromium Oxide film (PASSIVATION by Nitric Acid). This surface passivation will prevent corrosion pitting of headbox flow surface .

Headbox Apron (Bottom Lip) Repair

apron plate repair

Replaced apron could be repaired. The apron plate is sent to the workshop and put on the special support. The apron inspection and measurement are made before and after the repair. The apron repair is done by welding, grinding, bending and polishing. The repaired apron plate is sent back to the mill ready for next apron replacement.

Headbox Slice Control System Upgrade

Loosened and backlash in old style slice control system cause of poor movement and poor stability of the system thus impair the headbox performance and finally paper profile. For this kind of case, PMPRO recommend to install a new, clearance-free slice control system to the headbox.