Method of three layer injection molding with sequential and simultaneous coinjection
US6099780A · kind A · utility
42Cited by
7References
8Claims
0Family size
Inventor
Key dates
| Filing date | Dec 3, 1998 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Dec 3, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/253
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of multi-cavity valve gated three layer injection molding to form containers or preforms having a middle layer of a barrier material between inner and outer layers of a PET type material. The barrier material is injected through an annular channel in each heated nozzle simultaneously with the PET type material being injected through a central melt bore in each valve pin. This reduces cycle time and produces a thicker inner layer of PET.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.