gettin' rid off gate blushing in monitor front bezel

[ssm]

I need assistance/advice, for elimination of the painting ( retouch) for the mentioned molded component (obvious reasons$$$),comments from any that have been facing similar issues are welcome.
I modified gates, runners, condition improved, but it stills not acceptable.

Any idea?

 

[dhuffy]

ssm,

Can you describe the layout (number of cavities, runner sizes, sprue sizes, gate size and style, etc...)? That will help in seeing where you are at. I guess you should also include where you started from also

Dave

 

Gate blush is caused by shear heating as plastic enters the gate. As soon as the gate has been coated with hot plastic, the flow changes and the shear effects disappear. Try putting an injection profile in: go very slow until the melt has passed the gate, then speed up. To avoid flow marks/ weld lines the best profile may be: very slow until the gate has been passed, then very fast to avoid flow marks, etc, then slow at the end to avoid diesel burns and flash.

Any questions? will be happy to offer help if I can

Stephen O' Leary
Training Manager
First Polymer Training

http://www.firstpolymer.com

s.oleary@firstpolymer.com