×
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

Solution needed for sieving of small but long plastic material

Solution needed for sieving of small but long plastic material

Solution needed for sieving of small but long plastic material

(OP)
Hello,

I'm in search of a solution for a sieving problem I have.
In our process we sieve our material to be <12mm after grinding.
The material is a plastic bottle (with cap).

The as we all know just under the cap of a plastic bottle is a strip to secure the cap when the bottle is not used yet.
The problem lies with these strips. When they go to our grinding process they will pass a 12mm sieve because they are very small, eventhough they are longer than 12mm.

This is a problem for our customer because they need material to be <12mm but we can't sieve those strip pieces in a good way.
I figure this is a problem which probably isn't experienced only in our process but in other processes also where they try to sieve and have problems with long small materials.

Does anyone know of a solution to this problem?

Thanks in advance!

RE: Solution needed for sieving of small but long plastic material

Water flotation - PET has specific gravity higher than water, PP is lower.

RE: Solution needed for sieving of small but long plastic material

(OP)
Yes that is used allso but after the grinding. PET and HDPE are grinded together. We need a way to sieve off everything smaller than 12,5mm (those long pieces not included) before it goes in the floatation tanks.

RE: Solution needed for sieving of small but long plastic material

Try Googling matchstick sifters. They have a corrugated screen with slots in the bottom, the match sticks orient one way on the screen, the slots remove the short sticks. A different set of slots remove the long sticks.
B.E.

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

RE: Solution needed for sieving of small but long plastic material

(OP)
Thanks for the input, most helpful!

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! Already a Member? Login


Resources

eBook - Integrating the Engineering Ecosystem
Aras Innovator provides multiple options for integrating data between systems, depending on the scenario. Utilizing the right approach to meet specific business requirements is vital. These needs range from authoring tools, federating data from various and dissimilar databases, and triggering processes and workflows. Download Now
Research Report - Simulation-Driven Design for SOLIDWORKS Users
In this engineering.com research report, we discuss the rising role of simulation and the paradigm shift commonly called the democratization of simulation. In particular, we focus on how SOLIDWORKS users can take advantage of simulation-driven design through two analysis tools: SOLIDWORKS Simulation and 3DEXPERIENCE WORKS. Download Now
White Paper - Industry 4.0 and the Future of Engineering Education
With industries becoming more automated, more tech-driven and more complex, engineers need to keep their skills and knowledge up to date in order to stay on top of this wave—and to be prepared for the Industry 4.0 future. The University of Cincinnati offers two online Master of Engineering degree programs designed specifically for practicing engineers. Download Now
eBook - The Design Gridlock Manifesto
In this eBook, you’ll learn 6 ways old CAD technology slows your company down and hear how design teams have put those problems to rest. “The Design Gridlock Manifesto” shares first-hand modern CAD experiences from 15 companies around the world. 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