Method of injection molding an article with a cellular density distribution which gradually varies between a high density cellular exterior and a low density cellular interior
US6146562A · kind A · utility
Inventor
Key dates
| Filing date | Mar 13, 1998 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Mar 13, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C44/0415
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing an injection molded article with a gradually varying cellular density distribution, whereby the cellular density distribution varies between a first cellular structure of a high density and a second cellular structure of a relatively lower density. The method comprises forming a mold cavity be engaging a first mold section with a second mold section and injecting into the mold cavity an injection mixture which contains a blowing agent. A gradually varying density distribution is created according to a predetermined control function which depends on the mold cavity volume and the injection rate of the injection mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.