Good Book for Plastic Design

It is NOT in "a" book.

Plastics industry - Wikipedia, the free encyclopedia

1. SPI - Society of the Plastics Industry
   
3. Plastics Industry Association - Training, News & Information | MAPP.
4. Plastics Industry Associations

Thanks Lyn for the links. I started using different plastics mainly as a convenient material for building prototypes. I learnt that one can use a converted cheap heat gun (from hardware store) to do plastics welding. The R&D Company I work for throws aways a plastics scrap. So I can get off-cuts cheaply this way. I have not yet ventured into moulding. It could well be that there are cheap and simple ways to get into moulding as well. I've seen some guys do joining by fusing soft plastics together. Takes a bit of practice, but it appears to be relatively simple to get into. Do tell - Does plastics moulding require sophisticated or expensive equipment or is there a similar easy way to get into it?

True injection molding requires lots of pressure to keep the mold closed during filling and filling itself takes considerable pressure, usually hydraulic. Thousands of pounds of pressure are required. Typically 2,000PSI is required to insure that the mold halves don't separate during injection.

For prototyping a Maker-bot may be better for you. MakerBot Replicator™ It uses thermoplastic rod that is melted and dispensed by a traversing head. There are other machines that do this too.

Look at rapid prototyping to get an idea.

Good luck.

Hi all

Making prototype plastic parts has always interested me. Using an aluminium die, (good heat transfer and easy machining) combined with a hydraulic jack to both close the mold and force in the molten plastic has potential. I've uploaded some pictures of a homemade injection moulder, which made some useful parts for the owner.

You can see some plastic poking from the nozzle. The injector was charged by removing the piston and feeding in chopped up scrap plastic. His wife is still looking for her oven thermometer, I hope she doesn't read this blog.

Tony

donno if it's for any good or efficient but i've found my answeres from
http://www.plasticstoday.com/
http://plastics.ides.com/generics

Hi Sanji

Protomold had 6 PDF files on mold design which I have, but don't seem to be on their site anymore. If you email me*, I'll attach them.

Tony

*CR4 ADMIN - email address removed

From the CR4 Rules: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers and email addresses posted in threads or comments. You can share this information via the CR4 internal messaging system.

what kind of plastic design

anyway using this online may help

http://www.tangram.co.uk/index.htm

just found from my email:

Free Design Guide for Plastic Parts
How to use the Plastic Design Guide

1. Refer to the Design Considerations at the bottom of this email. Consider whether each item on the checklist is a factor in the application or affects performance requirements for the component design.
   
2. Select the categories that have the greatest affect on your application.
   
3. Review the materials in the Plastic Properties Handbook and make a list of possible material candidates.
   
4. Contact our technical support to discuss options or ask additional questions.

Plastic Machining Design Considerations

• Thermosensitivity - tolerance can change in different temperature conditions
• Sensitivity to humidity and hygroscopic absorption affects tolerance
• Sensitivity to chemicals and oils
• Notch sensitive corners and square ID's
• Tolerances
• High loads
• High impact
• Fatigue loading or cycle loading requires consideration of flexing, deflecting, and compression
• Temperature - max/min extent of time
• Electrical considerations such as insulating properties
• Wear resistance or abrasion resistance
• Dimensional shape retention (load, cold flow, temperature)
• Regulatory requirements (FDA, UL, etc.)
• Appearance (color, texture)
• Optical requirements
• Outdoor use

Now that you've identified the important factors in your application, evaluate material specs in the

Plastic Properties Handbook and select your material!

EPP Corporation is an ISO Certified Plastic Machining expert specializing in the critical instrumentation, medical, aerospace, fluid power, and military industries

Alex Curtiss EPP Corporation (847) 952-8400 sales@eppcorp.com
eppcorp.com

Thank you tanbui for your valuable information ll get back to u if i got any doubt