Logo
Testimonial Contact Us Sitemap
Intertek IATF
 
  Air Assist
  Overmold
  Rubber Molds
  Unscrewing Plastic Injection Molds
  Hot Runner Molds
  Cold Runner Mold
  Precision Plastics
  Family Mold
 
  Plastic Injection Mold Design
  Plastic Injection Mold Repair
 
  Foam Injection
 
  Painting, Plating & Welding
  Assembly Services
  Custom Packaging
 
  Baby Series
  Home Series
  Personal Series
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  CONTACT US TODAY!  
 
BY PHONE
+86-769-87888726
(24 Hour Messaging Service)
 
BY EMAIL
ckho@richfieldsplastics.com
 
BY SKYPE
 

Case Study

Plastic Tool, Mold Manufacturing and Plastic Injection Molding

 
Service: Plastic Tool and Mold Manufacturing, Plastic Injection Molding, and Secondary Process (Pad Printing)
 
Customer: Global house wares company selling bake ware, cookware, cutlery, gadgets, and tools originally from US.
 
Product Description: lid for sugar jar used in the kitchen
 
Type of Material Used: Polypropylene (PP) plastic material, color Red, RoHS compliant
 
Problem: Customer had a cover mold with internal threads built with unscrewing device. They approached us and said they were having the following difficulties with the mold:
  1. Unscrewing device was not working consistently; parts often got stuck during unscrewing, thus production is delayed by 2 hours every time this happens.
  2. Cycle time is taking too long because unscrewing molds need to unscrew the part out before the part can be ejected from the mold.
  3. Production output is low.
  4. Scrap rate is high.
Solution: Richfields team looked into the 3D model of the part, and analyzed the functions of the plastic part produced by this mold. We noticed that the threads are not deep enough and can actually be ejected by forced ejection using ejector plate. This will make it simpler instead of using unscrewing device. These are the things that we did:
  1. Re-built the tool using ejector plate only, without using unscrewing device. The ejection process was a Forced ejection. We added some drafts on the threads facing the ejection direction so that the threads will not be damaged during forced ejection
  2. Proper tool layout to achieve efficiency during production
  3. Injection Molding Parameters were set to achieve best parts
Very simple changes actually resolved the problems mentioned before by the customer. Richfields was able to achieve the following for the customer:
  1. No more troubling with unscrewing device since we are doing forced ejection using ejector plate.
  2. The cycle time per shot cycle is 8 seconds faster than the original mold design using unscrewing device.
  3. Production rate is now very consistent and has high production yield.
  4. Scrap rate minimal.
 
Back to Case Study
 
ph. +86-769-87888726 | fax +86-769-87909012 | mo. +86-13058533382 |
Copyright © 2008 Richfields Corp. Ltd., Unit 1304, 13/F., Cameron Commercial Center, Nos. 458-468 Hennessy Road, Causeway Bay, HK.
| |