Method for fabricating a thin inner barrier layer within a preform
US5571470A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1994 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Feb 18, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0069
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A very thin inner layer composed of a polymer chosen for its barrier and/or inertness properties is fabricated within a container preform constructed mainly from another polymer, or a structure of polymers. The inner layer on the preform is produced either by a controlled coating method involving coating of the injection mold core rod prior to injection molding or by a coating applied directly to the preform after injection molding. This enables both inner and main layers to be brought together at a time when the interface between them is molten. A tie layer can be employed, when desirable, to enable the layers to be combined without melting the layer interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.