A sheet can have the correct nominal thickness and still rise into a printhead. We recommend checking where the media lifts and when the contact happens before treating a larger head gap as the answer. A bent leading edge, a poorly seated blank and a changed loading method need different checks.
Use the installed printer’s height-setting and restart instructions. This guide does not establish a universal clearance, vacuum value or approved media thickness for HANNAI printing configurations.
Start with the position of the smear
In a Reddit thread about a BN-20 smearing at the start of a print, users discussed media curl and possible contact. The useful observation is the location: the start of the job behaved differently from the rest. The replies do not prove the cause on another printer, so we use them to frame a comparison rather than copy their suggested feed distances.
Keep a failed sample with its leading edge and machine direction marked. Record whether the mark occurs at the beginning, one side, the same position on each blank or after the job has been running. Preserve any warning or contact event before clearing it. A smear alone does not prove a head strike; contact risk needs the printer’s approved inspection.
Inspect the material as it is actually presented
Compare the incoming material with its supported condition in the machine. Look for curled corners, bent edges, seams, loose scraps, adhesive lift and incorrect seating. Include a fixture’s height where a fixture is part of the approved setup. Nominal material thickness describes only one part of the available clearance.
We would distinguish a uniformly thick substrate from one local raised point. A setting suitable for a flat sample may not accommodate a lifted corner. Do not hold material down by hand near a moving carriage or disable a detector to let an unstable sample pass.
Use the location to narrow the investigation
| Pattern to record | Comparison worth making | Decision boundary |
|---|---|---|
| Mark near the leading edge only | Accepted and failed leading edges; loading and support | Do not assume the whole sheet needs a different gap |
| Contact risk at one corner or fixture position | Highest point, seating and local debris | A material preset cannot correct a mis-seated part |
| Problem appears after a material or preset change | Original and replacement material records; selected settings | Confirm which condition changed before adjusting |
| A previously stable job develops repeated contact | Retained sample, warning history and safe inspection findings | Stop and follow service guidance; do not continue to prove repeatability |
Stabilize the support, then confirm the approved gap
Inspect accessible supports and loading surfaces using the prescribed safe state. Confirm only the functions actually fitted: a flatbed fixture, roller transport and a vacuum hold-down are different arrangements. Do not assume every packaging printer has adjustable vacuum or automatic height sensing.
Epson’s P10000/P20000 platen-gap guidance associates leading-area scuffing with possible curl and head contact. Its named gap settings apply to those models. For the installed machine, confirm the permitted material condition and height method rather than importing another printer’s dimensions or setting names.
An unnecessarily large gap is not a substitute for stable media. Ask the printer supplier which print-quality and alignment checks apply after the authorized height change. Keep the previous setting, selected media entry and reason for the change in the job record.
What to check after suspected contact
Stop the job using the machine procedure and obtain the required inspection before another trial. Do not wipe the nozzle plate, move the carriage or force it past an obstruction using an improvised method. Follow the system’s parking, access and isolation sequence; some service actions require trained personnel.
Once cleared for testing, retain a nozzle check and any required alignment results. Test the intended loading sequence and representative approved material, including the condition associated with the original problem. One flat sample does not establish that the remainder of a variable lot is suitable.
Make the next setup repeatable
Keep the material reference, leading-edge photograph, support or fixture identity, media preset, authorized height setting and accepted sample together. If a comparable trial changes more than one condition, record the limitation instead of attributing recovery only to the gap.
Our digital printing equipment page is the starting point for a configuration discussion. Through the inquiry page, send the material shape and flatness information, strike location, printer identity and loading method so the applicable setup can be confirmed.