What are the typical Parison Programmer faults?

It is very rare that the parison programmer has a genuine fault – its nearly always something else!


Servo valves are high on the list of being the cause of problems, partly because they are dirt sensitive, and partly because so many companies have inadequate maintenance standards.

Cable damage

Cable damage is common. Cables melt when they touch the head or extruder barrel. Wires often get pulled out of plugs.

Hydraulic accumulator

If you are getting sluggish response it is worth checking the hydraulic accumulator.

Virgin-regrind mix

If you are trying to produce a much lighter container than normal you might find that there is a greater variation in weight than you can accept. On the subject of weight variation the biggest culprit is inevitably traced to variations in the virgin-regrind mix.