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Ulynovsk
23rd December 2018, 06:23 PM
Circle around the intake duct. Hot runner system. Material polypropylene327
rickbatey
27th December 2018, 10:33 AM
Adjust heat at tip of valve gate and see if slowing the injection rate helps.
Rick
Little Pink Steve
11th January 2019, 09:20 AM
In addition to Ricks comments, it appears that you may be trying to over pack the mould and "BALLOONING" is visible at the surface around the gate. The stress marks from the ejector pins would suggest this.
Little Pink Steve
17th January 2019, 06:55 PM
What was the conclusion to this?
Derrick
21st January 2019, 02:54 AM
What is at bottom, and bigger ejector the same size as the circle? Actually, I am thinking of ejector rebounding after holding pressure removed.
Pilot
5th February 2019, 09:27 AM
It looks, that the part is overpacked too much...… but this will not solve the sprue issue :-)
michaelhurley87
28th June 2019, 02:01 PM
This part is way too over packed to even worry about the blush at the gate. Is that defect on a short shot? Try reducing initial fill speed, adding extruder delay or reducing recovery (screw speed/BP). But first... get rid of the pin push.