Plastic Blow Molding Tips


Polymer sticking to core rods Melt temperature is too hot
Parison mold temperature is too hot
High or low packing or holding pressures
Hot core rods
Hot core rod tip
Low lubricant level in resin
Polymer sticking to parison mold Melt temperature is too hot
Parison mold temperature is too hot
Packing or holding pressure is too low
Packing or holding time is too short
Low lubricant level in resin
Short moulding Loss of heat in the parison mold
Loss of heat in the extruder or manifold
Loss of injection pressure
Loss of holding pressure
Loss of screw RPM
Foreign material is blocking the nozzle
orifice.
Nozzle is frozen off due to low
temperature in base
Manifold is too cold
Nozzle orifice is too small
Not enough preform time
Hopper is empty
Neck folds and shoulder cuts Neck zone temperature is too cold
Melt temperature is too cold
Core-rod temperature is too cold
Injection pressure is too high
Holding pressure is too high
Holding time is too long
Cure time is too long
Parison Flashing Melt temperature is too hot
Parison mold temperature is too hot
High injection pressure
High holding pressure
Low clamping pressure
Nozzle is damaged or not seated correctly
Mold construction is poor
Long, high-pressure, preform time
Mold coolant lines are plugged
Pigtails Reverse RPM is too high
Decompress time is too long.
Incomplete Threads Neck zone is too cold
Melt is too cold
Injection pressure is too low
Holding pressure is too low
Holding time is too short
Poor venting in parison mold
Insufficient blow pressure
Rocker bottoms Blow time is too long
Poor blow mold venting
Poor cooling in blow mold bottom
Melt temperature is too high
Cycle is too fast
Warped side walls Insufficient blow time
Insufficient blow pressure
Poor mold venting
Poor mold cooling
Low melt temperature
Parison temperature is too low
Cycle is too fast
Poor gates (fish eyes, flash, tails, etc.) Too much decompress, RPM or time (fisheyes only)
Not enough slug on parison bottom (fisheyes and holes only)
Too much slug on bottom of parison (tailsonly)
Not enough decompress, RPM or time
(drool and tails)
Bottom zone is too cold (tails)
Manifold is too hot (fish eyes)
Manifold too cold (tails)
Inadequate external tip cooling
(fish eyes)
Insufficient packing time
Insufficient cure time
Insufficient hold pressure


The injection moulding guide is based on our current knowledge and experience. In view of the many factors that may affect processing and application, this data does not relieve processors from the responsibility of carrying out their own tests and experiments; neither does it imply any legally binding assurance of certain properties or suitability for a specific purpose. We expressly disclaim liability for any loss, damage, or injury directly or indirectly suffered or incurred as a result of or related to anyone using or relying on any of the information in this documents. We expressly disclaim any contrary implication.

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