SOLVE BLACK LINE PROBLEM
I M THANKFUL TO ALL WHO HELPED ME TO SOLVE BLACK LINE PROBLEM BY REDUCING BARREL LAST TWO ZONE TEMPS BY 25~30* I WANT U R EXPERT OPINIONS ON MY LOGIC FOR THE CULPRIT. PLZ!! SHARE U R VIEWS !! AS THE BOTTLE WAS HEAVY WALL >1mm NEEDED BLOW TIME LONGER THAN 10 s. SO INJECTION DELAY TIME WAS MAX. TO COMPENSATE RESIDENCE TIME OF PREFORM IN INJ. MOLD. THIS WAS ADDING TEMP. FOR LONGER TIME TO THE FEED ZONE MATERIAL TO REACH TO METERING ZONE TILL IT GETS INJECTED.
AND THIS WAS THE CAUSE OF COLOR MASTER BATCH GETTING DEGRADED GIVING BLACK LINE IN THE SHORTEST RUNNER PATH i.e. THE FIRST ENTERED MATERIAL IN NEXT SHOT
This will by all means provide a wide!! useful knowledge to the members as well visitors & followers!!
diff. Of inj. Blow molding with horizntal plastifier!!
In this case!! Screw always returns back to its home position back!! I.e.
Always screw remains at the end position (home position) so the Temp of
hopper throat zone as well its preceding zone!! Which mainly covers a feed
zone!! Has the Most effect on the Melt!! And this is the culprit only!!
So only by changing Temp of these last Two zones could solve the problem!!
Rest all parameters e.g. Inj. P/F, screw speed etc. Remained same!!
In case of any further clarification!! We can surely!! Discuss more!! If,
I hv surely mentioned about Injection Blow Molding!!
Any how!! Thanx for ur participation!!
Will u like to be a part of New Trouble shooting group for inj blow
molding, inj. Molding & blow molding?? If, we create a new group??
Sure I would love to be a part of the group.