burn marks?

[yangozugur]

What's the mean these marks?

ı am not sure this is burn marks or something?

Could it be the black color left over from previous that on nozzle?

have to say that after 10 products are good a few products have defects that you see.

ı think mold is getting hot and we see these marks but it improves after a few broken products, and so on.


why could this be?

[Suhas]

Can you take a close up and post?
Looks like the area needs venting.
Suhas

[Josue]

Looks like degradation for me, or as you mention if you ran black color or a different resin, I will recommend you to clean very well hopper, hoses, dryer, even a few black pellets could cause a mess, need to be sure all its clean between color changes, and also barrel purge with asaclean or other chemical purge ,
regards

[yangozugur]

Can you take a close up and post?
Looks like the area needs venting.
Suhas

You'r right
it's not obviously.

[yangozugur]

Looks like degradation for me, or as you mention if you ran black color or a different resin, I will recommend you to clean very well hopper, hoses, dryer, even a few black pellets could cause a mess, need to be sure all its clean between color changes, and also barrel purge with asaclean or other chemical purge ,
regards

ı thought take ram out to clean with any cleaner but problem come up 3 out of 20 and ı am confusing.
ı will consider degradation.
Thank you Josue
regards.