Guangzhou Keshenglong Carton Packing Machine Co.,Ltd

1. Feeding Unit
Trouble	Possible causes	Remedy
Sheets don't feed	Feed gate is too tight	Check clearance with sample sheet from order and make adjustment accordingly
	Rear panel is too tight	Check setting against sheet size and/or manufacturing diagram
	Too many sheets in feeder	Reduce quantity in feeder
	Moist sheets	Check sheets for moisture content.
Double feeding of sheets	Front gate is too high	Reset gate to just allow one sheet through
Sheets crushed	Feed roll is too low	Adjust clearance in accordance with sheet thickness
	Crushed at thecorrugator	Check thickness of sheets received from corrugator
	Feed rolls are out of parallel	Make sure feed rolls are parallel and are not loose on either end
Sheets slipping	Worn feed roll	Check feed roll to see if it has hardened and has become too smooth to grip sheet firmly without crushing
	Sheet size is too small.	Check sheet size to see if it is below the minimum sheet size of machine
	Excessive bending	Check the bending degree of sheet and pick out too bended ones
	Improperly calibrated indicator	Check dial and instrument panel on operator's side of machine
Variable printing and slotting results	Improper feeding	See "Sheets don't feed" and "Sheets slipping" parts above
Poor printing	Poor printing	See "Sheets crushed"
2. Printing Unit
Trouble	Possible causes	Remedy
Insufficient Ink	No ink in ink tank	Replenish ink tank
	Clogged hoses	Remove and clean
	Air pressure loss	Check and fix air circuit
	Ink bubbling	Add antifoaming agent to ink
	Electricity failure	Check and fix electric circuit
	Ink circulating system filter clogged	Remove and clean filter
	Pump not turned on	Ensure that system switches are activated and press Reset button
Impression roll does not move up or down	Air solenoid valve defective	Replace solenoid valve
	Pneumatic lines clogged with oil / water	Remove blockage, replace lines if necessary
	Leaky pneumatic lines	Repair or replace
	Air supply not activated	Ensure that air supply valves are open
Jam-up in printing unit	Loose liner on sheet	Replace sheet
	Loose sheet guide	If sheets are slightly warped, a loose sheet guide may cause snags, so the guide needs to be tightened
	Sheet liner sticking to printing plate	This will happen if machine is stopped during feeding, so remove jammed board and carefully clean printing plate
Loss of register	Misplaced printing plate	Relocate printing plate
	Stretched or loose printing plate	Repair or replace
	Loose or worn gears in phase shifter or main drive	Repair or replace
	Loose axle sleeve	Replace
	Insufficient pressure on pull rolls	Adjust roll clearance
	Worn upper pull roll	Replace
Printing out of registration	Insufficient sheet control	Add pull bands
Print not centered	Printing blanket not centered	Improperly scribed plate centerline. Lateral setting of print cylinder not returned to "0" after previous order
Ink return flow sluggish or stops during run	Ink return pump clogged with paper dust	Dismantle and clean return pump (must be done once a week)
Ink viscosity drops and/or ink level increases	Water getting into ink, automatic wash-up device turned on	Check water shut-off valve and cylinder, increase air supply
Ink overflows	Ink flow is too great	Ink return flow should visually be controlled below than 3/8", and supply capacity is greater than return capability
Ink overflows	Ink return pump clogged	Dismantle return pump and clean
Ink throws at high speed on print cylinder	Ink flow is too great	Cut down ink flow
Wash up water runs sluggishly or stops in return line	Ink return pump clogged with paper dust	Dismantle return pump and clean
Insufficient ink supply	No ink in tank	Fill ink in tank
	Clogged hoses	Remove and clean
	Ink bubbling	Add antifoaming agent to ink
	Ink filter clogged	Remove and clean or replace
3. Slotting Unit
Trouble	Possiblecauses	Remedy
Slotting out of registration	Improperly sheet feeding	See "Feeding unit"
	Less pressure on sheet when transporting	Decrease clearance between guide rolls, or pre-creasing wheels, or creasing wheels
	Seriously worn slotting blade	Replace the slotting blade
	Loose slotting blade	Tighten slotting blade
	Incorrect phase of slotting blade	Adjust phase
	The upper and down shafts of pre-creasing wheels or creasing wheels are not parallel	Adjust shafts to be parallel
Slotting not uniform, coarse edge, or sheet crushed	Seriously worn slotting blade	Add pull bands to blade carrier
	The driving chain for lateral movement of blade carrier is loose	Check and fasten the chain
	The front and back slotting blades are not in a line	Adjust the blades and make them in a line
	Less pressure of creasing wheels	Decrease the clearance between the creasing wheels
	Poor quality sheets, such as dryness and low fiber proportion	Use high quality sheets
	Sheets crushed at the corrugator	Check sheets for damage as received fromcorrugator

Trouble Shooting Chart