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Here is a list of some common sealing problems
that are encountered, and their possible causes.
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To calculate application
torque, the standard "rule of thumb" is to take
the closure diameter in mm and divide by 2. The result
equals the application torque in inch pounds. |
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No Seal or Weak Seal No Seal or Weak
Seal
High Removal Torque
Scorching
Low Removal Torque
Pulp Shears Out of Closure
Other Factors to be considered
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- Output setting too low
- Conveyor line speed too fast
- Container / sealing head adjustment
- coupling distance extreme
- off-center
- head not parallel
- Insufficient cap torque
- Product contamination
- Marginal quality container finish
- Insufficient land area
- mold marks, flashing, or parting line
- saddle or taper
- Bottle treatments and pigments
- Incompatible liner material
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- Insufficient wax absorption due to lack of power or excessive
conveyor line speed
- Bonded backing sticking to closure (single element)
- Liner quenched by product splashing
- Excessive application torque
- Undersized liner disk and plastic from the container finish
invading the pulp
- Excess amount of bonding wax or wrong temp wax
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- Excessive output power setting
- Closure sealing head alignment
- not centered
- not parallel
- Low application torque
- Improper liner material
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- Insufficient wax absorption (see High
Removal Torque)
- Improper gluing
- Friction fit liner is undersized
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- The proper sealing head for the closure
- Variations in container height
- Dimensional conflicts between closure and container
- Storage considerations of the liner material or container
- Porosity of the pulp
- Liner insertion into the closure
- Package, material, or equipment changes
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