STR
Name every gap in the STR module from CK transfer drum to FAM combining belt
1.4mm
Name 3 sources of contamination in combining
TBA, perfume, cores/FAM debris, ice build up from LCNR, WLA
Name 3 hot spots that should be cleaned after a trim loss.
T&R feet, T&R DD, FK, Scraper blades/bearer rings, WF plows
Which wing is OPT applied to first?
DS
Explain the purpose of hi vac and low vac on the OPT anvil.
Hi vac carries OPT around anvil, low vac allows it to be slipped underneath and released.
What is "stair stepping" and how do you fix it?
Core CD variation caused by BDT and SPP not being in phase with each other, FAM not positioned at MD center of BDT feet
What causes dry edge and WLA streaks?
Web mistracks, charring in glue gun
What component does the FK load on?
Explain 2 ways we mitigate contamination from the FK
Bearer rings
Scraper blade, hitting hot spots
What would you do to address OPT flipping down between the plows and T&R infeed conveyor?
Check SFA bonding gap and return to CL
Name 2 reasons why PFA placement on the pad can be off target.
Pad position on T&R DD, wrapper web tracking, PFA gun not at CL position
Verify BDT-TDD-FLDD-FAM combining belt gaps, verify vacuums are at target, inspect combining surface belt for contamination that could prevent vacuum, verify UCR gap, verify FAM combining drum plenum angle, verify blowoffs are at target
Name the function and position of both the mister and air knife.
What will happen if either component is positioned off target?
Mister - cools TBA and helps prevent contamination build up, should spray tangent to the LCNR; if angle off target, large build up of TBA contamination that can mistrack the web or wrap combining
Air Knife - keep TBA off combining belt, angled downward at backsheet and cores; if off target, combining will build up with contamination which can affect core transfer due to vacuums being plugged
What component allows the FK cut pressure to increase at splice events?
Proportional valve
How would you verify cutting on SFA? What problems does cutting on SFA cause? What is the target dry edge from SFA to end of OPT?
Check pad 1 and pad 2 to verify SFA application, inspect anvil and blades for glue contamination; 3.5mm
If PFA is too far toward the lead end of the pad, what would you do?
Phase T&R forwards to pick up pad later and move it toward DS on T&R DD
What causes false core skew?
Web tracking at vision system
What causes a combining wrap and how would you react afterwards?
Clean contamination, verify WLA drooling, check and home UCR gap
Explain where the main HMI gets its Average CD positions from for BDT, Crimper, and FK and what those positions mean.
Vision systems in the line detecting center point of web/pad
When would you trigger on adjusting core placement at the FK discharge and how would you adjust it?
If you strobe the WF plows from below and notice the core is hitting the plows or is entering them skewed; Address core skew if necessary, then adjust crimper infeed, crimper, and FK infeed to center the core and pad
What checks would you do to verify whether or not the PFA MP is leaking?
Check pad for PFA ghosting, check T&R DD and 1st TFD roller for PFA contamination
Name a possible cause of BDT feet skewing in run.
Cam bearing failure, locking collar loose
Explain the purpose of the UCR and FAM combining drum plenums
Hold and release the web/materials
Explain the purpose of the FK jacking bolt and what can happen when the wrong one is installed.
To act as a physical stopper to set the FK DD to die gap
Name 5 critical process set ups for a successful wingfold transition.
WF plow is placed centered in CD (250mm vs backplate)
Web and core centered and stable
WF conv belt is centered vs plow
WF conv belt vacuum as per centerline – if not, impacts WF stability and skew
SFA bonding roll gap needs to be setup correctly to avoid wing skew/OPT buckles/flipping down
OPT anvil gap at target
Plows free of contamination
Flute and Fountain Air positions and angles at target
Flute and Fountain Air pressure/air flow at CL (first blowoff is most critical)
OPT is not making contact with OS plow
How is the T&R linked electrically to TFD rejects?
Dirty - something detected outside of window; OPT rejects, trim loss, contamination on sensor, wrapper tension
Error - nothing detected within image window; lack of core transfer, wrapper tension
T&R home offsets command image to be taken, linked via digitronics