Label Dispensing¶
One of the best tools available to fault find label dispensing problems is the video camera in your mobile phone (especially if it has slow motion capabilities). Record a video while printing a few labels. That should reveal if the label dispensing is setup correctly.
Usually a camera position slightly below and in front of the printer give a clear view of the label dispensing.
Example of camera position to record the label dispensing.
Crucial for Good Label Dispensing Are¶
- Right Print Position
If the problem occurs for an applicator with pad - the proper Print position is very important. See applicator manual for correct setting on your applicator. If too far down the label will crash into the pad - if too far up, the label will not be able to reach up the pad.
- Good Function for Support Blow
- Check the air flow through the Support Blow nozzle. If reduced, clean manually with a 1 mm drill. See picture Check air support to the printer - air pressure should be approx. 5.0 bar Check for air leakage Enable the Support Blow Valve () and check if the air is leaking on its way through the printer.
- Clean and Not Worn Print Roll
- Worn or dirty print roll has a very negative impact on the label feed.
- Proper Settings
See printer and applicator manuals for recommended settings that have an impact on the label dispensing.
- Back feed - ().
- If the delay is too short, the label has no time to come loose from the liner before retracted into the printer again. Preferably make a film in slow motion of the dispensing sequence. This shows if the label is fully dispensed out and retracts before it is caught by the vacuum in the pad.
- Media suitable for dispensing
- See Media section in the Label Dispensing tutorial.
Label Falls off the Applicator Pad¶
Correct size of applicator pad used
Check air supply to the printer - air pressure should be approx. 5.0 bar
- Check for air leakage
Enable the Applicator Valve () and check if the air is leaking or obstructed on its way through the printer and applicator.
- Check o-rings on the applicator pad and bracket.
The venturi outlet on applicator pad must not be blocked.
Settings¶
- See printer and applicator manuals for recommended settings that have an impact on the label dispensing.
- Back feed - ().
If the delay is too short, the label has no time to come loose from the liner before retracted into the printer again. Preferably make a film in slow motion of the dispensing sequence. This shows if the label is fully dispensed out and retracts before it is caught by the vacuum in the pad.