Thank you rick again for the reply.
At least I know I'm thinking in the right direction.
I hope to run a trial soon. I will report back the results so this maybe helpful to others in a similar position.
Thank you rick for the reply.
When I say fail, I mean the hinge breaks upon flexing once or twice.
A few more details.
The lid is fine right after molding. 1 day after 4% fails. 2-3 days after 20% fails. (upon flexing once or twice)
What is the reason for this? I assume it is because aligned...
Thank you Paul for the reply.
Unfortunately the machine parameters are no where to be found. I recently joined the company at an entry level position and I've been trying to get the production to keep track of the settings. After months of trying now we are keeping track of some parameters...
Hi everyone,
First thank you to all of you who posts questions and replies to them. I've learnt a great deal from Eng-tips.
My question today is on PP living hinges. Production guys at my company are having difficulty in molding a living hinge that can be flexed more than a couple times.
The...
I've been looking into this problem as well.
I came across an additive called Polymag which you can add at 1% to make either the TPE or PP magnetic. Ten you can crush it all up and seperate the magnetic regrind from the non magnetic regrind. I have'nt had the chance to see if it really works...
I hope it's alright to keep posting questions.
Currently the company I work for manufactures thin-wall ice cream tubs with high flow PPCO-block. We do not add the regrind into the same process as we face numerous quality issues. I've been told black spots, poor mixing of regrind and virgin...
Thank you again for the helpful reply.
We do not have a compounding capability at the moment. We dry blend all material. Thats the main reason I have to go with a concentrate.
I set my target at 5% because it will be easier for me to convince both my boss and production to allow me to do a...
Thank you again for the help and advise.
I tested the crate after cooling to (-40C). The HDPE crate did not fail as badly as I thought it would. But out of three crates one cracked slightly on the sidewall.
The PPCO-Block crate I tested did not break at all. However it had stress whitening...
Thank you again for your reply.
I was hoping to test at 5% loading to see what effect it would have. I'm trying to obtain a sample with 1micron particle size (according to the supplier)
If people are loading at 40%, I hopefully can convince my boss to let me load at 5% to see the results...
Thank you Dr.DeArmitt for your reply.
I wrote to Kraton Polymers earlier today to see if they have an additive that can help me. By you confirming my thought process it slightly puts my mind at ease.
I'm testing a HDPE crate tomorrow at (-40C) to see if it fails and how it fails. Will report...
Can someone advise with what the Industry norm is for CaCO3 in blow molded items? Say for personal care items or milk jugs or motor oil cans or seats? Do companies add CaCO3 in these items to get a cost saving? How do you achieve this? What I've seen with injection molding is that the overral...
Is HDPE good for Deep Freezer Applications (-40C)? HDPE has a very low Tg and most datatsheets list brittleness temperature as -75C for HDPE. Therefore shouldn't hdpe be better for Deep Freezer applications? Such as a crate. However what ive seen is that suppliers list PPCO in their data sheets...
