×
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!

*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

PLASTIC COMPRESSION

PLASTIC COMPRESSION

PLASTIC COMPRESSION

(OP)
Hello,
I would like to know if anyboby knows about rapid manufacturing of plastic pieces aplying compresion. I mean, once you have the mold, you introduce the plastic with something manually and then you put the other part of the mold and press manually or with something. I need to know which plastic (is for a cap, nothing special)and which tools to put the plastic on the mold.

Thank you

RE: PLASTIC COMPRESSION

There is a process manufactured by an Italian company called Sacmi. They use compression moulding for caps and can produce around 1200 caps per minute.

RE: PLASTIC COMPRESSION

(OP)
Hello, this is not what i am looking for. I need something manual. I want to build the mold and apply manually the plastic and then press with something and get the piece. It is not for big production.I don't know what plastic material to use

Thank you

RE: PLASTIC COMPRESSION

To process the plastic you have to melt it, this then gives you a handling problem, you could try manufacturing a heated syringe from metal and squirt it into a punch and die set up. However you do it you will have to employ the skills of a toolmaker.

Usual materials for caps are either PP or PE.

My thoughs are that a manual process will lead to very poor quality with a high variation in part quality.

Why do you want to use this method, do you have budgetary constraints ?

RE: PLASTIC COMPRESSION

(OP)
Thank you. I am going to use this to make a kind of cap to protect a piece during a process. I don´t need many precission, only this have to fit a protect from something solid. I was thinking about a liquid or spray that apllied on the mold I am going to make then after press, it solidifies.

RE: PLASTIC COMPRESSION

Does the cap need any mechanical properties ? could you use wax ? How thick were you planing to have the part ?

RE: PLASTIC COMPRESSION

(OP)
What is wax?
I don´t need any special property in thickness, but 1 mm or 2 mm for example, it has to stand metal spray not breaking but I don't mind if it is damaged but not broken.ç
Where are you?I am from Spain

RE: PLASTIC COMPRESSION

I am in Thailand .... wax is the stuff candles are made from. How is the metal spray ? is it abrasive ?

RE: PLASTIC COMPRESSION

(OP)
Is not very abrassive, it is used to elimate some grease or metal surface defects but small.

RE: PLASTIC COMPRESSION

How many peices will you need ?

RE: PLASTIC COMPRESSION

(OP)
less than 10

RE: PLASTIC COMPRESSION

Then why don't you machine them on a lathe ?

RE: PLASTIC COMPRESSION

(OP)
Because I think that is faster and cheaper to do it in the way I told you,and the form is difficult to machining, then I prefer to machine once the mold and then to take from it the plastic pieces.

RE: PLASTIC COMPRESSION

Have you considered Vacuum Casting the parts? Vacuum Casting is a process used to create Polyurethane parts that simulate production plastics such as ABS, Nylon, and Rubber. From intricate buttons and connectors to large casings and car bumpers,
Using a long life silicone rubber, it is possible to cast up to 50 off from one mould, depending on complexity of part.
Surface finishes can be as per any requirement from gloss to spark finish.

Regards

Kieran
www.moulddesigner.com

RE: PLASTIC COMPRESSION

How about dipping them in Plastisol (which is the coating used on handles of pliers, cutters, etc.)?  This is available at hardware stores in the USA but I don't know about Spain.

RE: PLASTIC COMPRESSION

Plastisol will give you a rubbery part. If you want something harder, you could always mold it from epoxy. Either way, be sure to use mold release.

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

Solutions Brief - Protecting and Rescuing On-Ground Personnel
Keeping our warfighters safe and delivering them a competitive advantage is a key goal of departments of defense around the world. It’s a goal shared by embedded computing manufacturers like Abaco: we never forget who we serve.This case study describes how a major international contractor integrated an Abaco single board computer at the heart of its CAS/CSAR solution. Download Now
Datasheet - Top Enhancements Creo 7.0
PTC's Creo 7.0 has breakthrough innovations in the areas of generative design, real-time simulation, multibody design, additive manufacturing, and more! With Creo 7.0, you will be able to design the most innovative products faster than ever before, keeping you on the cutting edge of product design and ahead of your competition. 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