Defect injection
Defect injection
(OP)
Hello,
I have two parts (cavity 1 and 2) with different appearance (matte area on a larger surface on one part compared to the other) and I do not know if the injection parameters determined this effect and how they can influence the mechanical properties of parts?
It is possible the melt front cooling more quickly for one of the parts (the injection point to be asymmetrical compared to the two parts?).
It can be differences in crystallinity between glossy and matt zones?
Thank you.
I have two parts (cavity 1 and 2) with different appearance (matte area on a larger surface on one part compared to the other) and I do not know if the injection parameters determined this effect and how they can influence the mechanical properties of parts?
It is possible the melt front cooling more quickly for one of the parts (the injection point to be asymmetrical compared to the two parts?).
It can be differences in crystallinity between glossy and matt zones?
Thank you.






RE: Defect injection
Dan - Owner
http://www.Hi-TecDesigns.com
RE: Defect injection
RE: Defect injection
www.tynevalleyplastics.co.uk
Politicians like to panic, they need activity. It is their substitute for achievement.
RE: Defect injection
RE: Defect injection
www.tynevalleyplastics.co.uk
Politicians like to panic, they need activity. It is their substitute for achievement.
RE: Defect injection
Take a look at the mould cavities, if it looks the same then that is your answer.
Paul Kuklych
http://www.improve-your-injection-molding.com
RE: Defect injection
Thank you all.
RE: Defect injection
Campp... Have You done the obvious and 'sectioned thru/across these line-areas' to examine material flow/fusion... and mechanically tested Ftu, Fty, Fcy, FSy, strain, etc] at/across these 'line-areas' [as-well-as characterizing 'other areas away from this line'].... while looking for obvious physical and mechanical inconsistencies?
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
RE: Defect injection
The parts were molded in different cavities as evidenced by the in-molded "1" and "2" visible in the picture. The question becomes "why are the 2 cavities different?". If the surface finish isn't clearly called out on the print, I'd guess that the tool maker took some liberties - perhaps to help part ejection (or some other manufacturing parameter).