Low film weight

Insufficient film weight

Poor adjustment of lining machine

1) Increase air pressure
2) Use larger nozzle orifice
3) Increase lifting range of     needle

Solid content of compound

Use compound of higher solid content

Compound viscosity

Use compound of lower viscosity

Sedimentation and separation of compound

Stir well compound in lining tank

Excessive dilution

Reduce water dilution ratio

High film weight

Excessive film weight

Poor adjustment of lining machine

Opposite to method for low film weight

Improper selection of compound

Pigtailing

Cut-off of ompound at nozzle not harp, leaving small cess of compound appearing on shoulder or center panel

Improper cut-off

1) Lap needle and nozzle      (Lapping)
2) Increase air pressure      and decrease nozzle      orifice diameter
3) Increase after-spin of      end
4) Strengthen needle spring

5) Replace nozzle opening      cam or adjust electronic      timer

Viscosity of compound

Increase yield value

Build-up

Accumulation of compound around nozzle orifice

Improper cut-off

As above

Viscosity of compound

As above

Spills (Splashing)

Spilling of compound over curl(Bouncing out 
of channel)

Excessive compound

1) Decrease air pressure
2) Decrease nozzle orifice       diameter
3) Decrease lifting range of      needle

Excessive chuck speed

Decrease chuck speed

Solid content or viscosity of compound

1) Use compound of high      solid content and lower      liquid volume
2) Use high viscosity      compound
3) Reduce dilution

Overlap

Decrease lapped portion

Improper placement

Adjust nozzle to proper position

Plowing

Nozzle contact with compound coated on can ends

Nozzle position too low

Lift nozzle

Underlap

Part of compound missing along circumference due to inaccuracy in one or two turn lining

Poor adjustment of nozzle cam lobe, or electronic timing

Increase lobe or increase timing of needle lift

Slipping of ends on chuck

Adjust chuck to can ends

Hold-down pad does not works

Ensure smooth rotation of hold-down pad

Uneven distribution of compound caused by low air pressure

Increase air pressure and decrease nozzle orifice diameter

Overlap

Compound continues beyond accurate one or two turn lining

Poor adjustment of needle operating cam lobe or electronic timing

Decrease lobe or timing set of needle lift

Droplets

Drops of ompound on center of can end

Contact of nozzle with can end leaving chuck

Adjust nozzle position

Incomplete cut-off of nozzle orifice

1) Lap needle to nozzle
2) Strengthen needle spring

Rough nozzle opening cam

Replace the cam

Variation in film weight

Irregular variation of coating amount (film weight)

Worn-out or loose nozzle parts

Replace or tighten nozzle parts

Variation of pressure

Fault in compressor air, leaking

Sedimentation, separation, air bubbles or coagulation in compound

Examine contents of rubber tank and mix or strain, or change compound

Variation of compound temperature

Keep rubber tank temperature constant

Skips

Part of curl left uncoated

Low film weight

Increase film weight

Low chuck speed

Increase chuck speed

Slipping of can ends

Adjust chuck to can ends

Clogging by sedimentation, separation, air bubbles or coagulation in compound

Examine contents of tank and mix or strain, or change compound

Oil skips Excess application of drawing lubricant or machine oil

Adjust surface tension and viscosity of compound. Reduce or eliminate the oils

Blisters

Bubbles in the dried film

Improper drying

Decrease drying temperature, especially excessively high initial temperature

Bubbles trapped while lining

1) Adjust nozzle position
2) Adjust nozzle orifice      diameter and pressure
3) Adjust compound viscosity

Cracks

Breaking apart of the dried film

Improper drying

Raise drying temperature and increase time of drying cycle

Squeezing

Compound is extruded during seaming

Insufficient drying

Increase drying temperature and drying cycle

Seaming dimensions

Adjust seaming dimensions

High film weight

See solution above