Contact US

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!

*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

What type of plastic is this

What type of plastic is this

What type of plastic is this

Please help me identify this type of plastic

I saw a cheap plastic toy with a area where it looks like there are two transparent mat finished layers of plastic film on top of each other. When you use a stencil or any hard object to draw on the top plastic it looks like it gets stuck on the bottom plastic only at the points where you apply pressure. The places where the two plastic layers stick to each other becomes much more clear (transparent) than the re around it where the two plastic layers are still separated. If you want to clear what you have drawn you just slide a slider between the two plastic layers which separate the two layers from each other and the then you have a clean slate to draw your next picture.

Please help me identify this plastic product i.e. trade name or type of plastic name.

Where would one be able to source this product.


RE: What type of plastic is this

Top layer is likely polyethylene, bottom layer (20+ years ago) would have been some type of wax.

RE: What type of plastic is this

Magic Slate https://www.google.com/search?q=mystic+writing+pad...

The patent: http://www.freepatentsonline.com/2663095.pdf
Which leads to 563 hits for "magic slate": http://www.freepatentsonline.com/result.html?sort=...

This says the top sheet was probably polyester: http://kellykilmer.blogspot.com/2008/09/magic-slat...

But this is so retro. The newest ones are LCD based:

There are other variants of the same concept
> Etch-a-Sketch http://www.walmart.com/ip/Etch-A-Sketch/22626823
> MagnaDoodle/MegaSketcher, but it's based on a magnetic stylus that draws iron particles through a mesh screen. A magnetic swiper pulls all the particles back through the screen to erase

FAQ731-376: Eng-Tips.com Forum Policies

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx

RE: What type of plastic is this

You might be able to make something like a silicone rubber work for the backing pad, or another high-tack elastomer (polyurethane?).

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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