Tech Info

INDUCTION SEALING PROBLEMS

SYMPTOMS
NO SEAL

PROBABLE CAUSE

  1. Wrong sealing face on liner for that type of container
  2. Induction sealing equipment off
  3. Air space too wide
  4. Removing closure too soon after induction sealing
  5. Too low power setting for line speed
PARTIAL SEALS
High Percentage of Leakers
  1. Closure having too low on torque
  2. Induction head not centered above container
  3. Induction head not level
  4. Land area having high areas or low areas
  5. Land area not level
  6. Product touching liner when being induction sealed
  7. Part of land area contaminated with product, flame treated, or chemical treated
PARTIAL SEALS
LOW PERCENTAGE OF LEAKERS
LESS THAN 2%
  1. Inconsistency in required on torque
  2. Land area not flat or level
  3. Land area contaminated with product
  4. Closure not designed to accommodate the overhang of liner
  5. Liner too thick or rigid for closure to apply consistent pressure on
  6. the land area
  7. Closure not turning a full 360°
  8. Container finish has saddle, ridges, flashing, parting line or narrow
  9. land area
  10. Closure is too large for neck of container
  11. Closure should be designed to have raised pressure bead to cover
  12. majority of land area to ensure consistent and complete seals
DO LEAKERS OCCUR IN A COMMON
AREA
  1. Closure not turning a full 360°
  2. Check both parting lines
  3. Oversize liner (overhang) interfering with uniform pressure
  4. In unscrewed closure most times the overhang is in the same
  5. location so leakers could be at the overhang or opposite to it.
EXCESSIVE REMOVAL TORQUE OF
CLOSURE ON ONE-PIECE LINER
  1. Insufficient exposure time (conveyor too fast)
  2. Insufficient induction field strength (low power)
  3. Improper coil height
  4. Insufficient hot melt adhesive
  5. Hot melt off centre and squeezes up threads
  6. Liner disk undersized. Plastic from container finish squeezing and
  7. bonding to closure pulp backing
  8. Too high on-torque application
  9. Product touching liner when being induction sealed
SCORCHED OR BURNT PULP AND
INDUCTION LINER
  1. Excessive exposure time (low conveyor time)
  2. Excessive power setting (field strength too high)
  3. Bottle jamming under induction head
  4. Closure not fully torqued-on (no heat sink from containers and closure)
  5. Induction sealing head alignment not parallel, centred and level to closure
VERY LITTLE OR NO REMOVAL
TORQUES OF CLOSURE
  1. Closure applied too lightly (very little on-torque before sealing)
  2. Excessive power setting degradation of pulp backing
  3. Excessive application torque and stripping of threads

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UPDATE SOON!

UPDATE SOON!