Side TMS 5001, Instruction Manual

Page: 84 / 107

Page 83 of 106
TMS 5001
8.2
LIST OF SHAPING DEFECTS AND SOLUTION
8.2.1
ASPECT
DEFECTS CAUSE SOLUTIÓN
White stains or bottom Too low preform temperature - Find out reason and increase
temperature progressively
Failure in the decompression
valves
-Check the operation of the
decompression electro-valves
- Check static relay.
- Control the different parts of
the pneumatic facility.
Total opacity Too high preform temperature -Find out the reason and reduce
temperature progressively.
- Check oven air fan.
Crystallised preform material -Control preform quality and
temperature.
Partial opacity -Make sure all necks turn
around unhindered.
Porosity
(orange peel)
Dirty blowing air -Control blowing air quality
Environmental humidity -Control operation of air drier
and condensation removal.
Dirty mould cavities -Clean mould cavities as
explained in the maintenance
manual
Impurities on PET during the
process
-Control preform quality
8.2.2
FORM
DEFECTS CAUSE SOLUTIÓN
Corrugation
(Rings towards the inside)
Lack of primary air during the
blowing stage
- Check the presence of primary
air and pressure.
- Check primary electro valve
feeding.
Longitudinal malformation of
the container
Dirty outlets in blowing cavity - Clean air outlets
Low preform temperature - Increase preform temperature
progressively
Mould opening during blowing
process
- Check mould closing
adjustment.
- Check stress of the posts.
Vertical seam marked Incorrect mould closing - Check mould closing.
- Check stress of the posts.
Lack of press parallelism - Check parallelism between the
press and the rods.
Impurities inside the mould - Clean residues on the mould.
Ovalisation Too short high pressure lapse - Increase secondary air blow
lapse.
Lack of low pressure (primary)
pre-blown air
- Check operation of primary air
valve
Few air outlets in the mould - Clean mould exits.
Perpendicularity Too much material in the bottom
hinders cooling process.
- Control cavity cooling and water
cooler operation.
- Lower temperature in the upper
part.