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Kenplas Forum ==> Injection Molding (Machine) ==> black specks in preform
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check the material feeding pipe also.
regrind material to be cleaned properly.
Once hopper to be cleaned fully. ie make the hopper empty and clean inside the hopper.
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what is the effect of mould breaking speed can do on the preform quality.
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scratch like marks are comming in internal wall of preform
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Black specks not seen in resin. What are the possible resin for black specks during processing of preforms and during blowing bottles if not seen in preforms.
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1. Contamination within the pellets.
2. Improper purging materials or purging temperature.
3. Check overheating (band heaters).
4. Previous materials in the screw and barrel.
5. 25% or more recycled PET blended.
a) Pull and clean the screw and barrel.
b) Check for pits and excessive wear in barrel and on the screw.
c) Check screw non-return valve for hang-up areas.
d) Check nozzle and end cap for hang-up areas.
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This forum published since July 03, 2002.
Renewed on June 22, 2005. |
Discussion Forum