×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Problems feeding TPE pellets into small injection machine

Problems feeding TPE pellets into small injection machine

Problems feeding TPE pellets into small injection machine

(OP)
Hello

I hope im in the right forum.

Would like your tips and ideas as I'm having great difficulty feeding TPE resin into the auxiliary injection machine.

the material is Versaflex OM1245 in 3.5mm pillow shaped pellets. the machines have screws from 16-25mm and a the largest feed port is an oval 22x25mm.

we've tried vibrators, vibrating inserts, augers, etc but it just bridges. The latest idea now is to try starve feeding using a masterbatch doser, eductor, line vac, belt, or vibratory conveyor.

Thanks in advance,
ABerlin

RE: Problems feeding TPE pellets into small injection machine

Your problem can only be solved through trial and error. You may have to dust the pellets with talc or similar powder to reduce stickiness or friction. An agitator in the throat of the feed hopper is often used. You may have to use two or more feeders in series to go from large hopper to a smaller one.

RE: Problems feeding TPE pellets into small injection machine

(OP)
Thank you compositepro

I think youre right about the trial and error, the analytical approach does exist but i know what those calculation will tell me 'your feed port is 10x too small' however i can't increase much. what do you think about starve feeding and injection machine (as opposed to an extruder)?

RE: Problems feeding TPE pellets into small injection machine

If by starve feeding you mean feeding at a rate slower than the screw can remove pellets from the feed throat, then yes I think that would be very helpful to prevent bridging in the feed throat.

RE: Problems feeding TPE pellets into small injection machine

ABerlinMML,

From my old feed mill design days, a rule of thumb derived by trial, and error, was that the smallest size of a chute was 8 times the largest dimension of a pellet. so based on that, your min dimension should be 28mm. so it looks like you are close , but not quite close enough.
You may need a " Bin Feeder" at the discharge end.
B.E.

You are judged not by what you know, but by what you can do.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

eBook - Mastering Tolerances for Machined Parts
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
eBook – How to Choose the Correct Corrosion Testing Method
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close