Back-diffusion quality control method for barrier treated containers
US4391128A · kind A · utility
45Cited by
7References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1981 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | Apr 20, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process is provided for making a distinction between solid, porous materials, e.g. thermoplastics, having surfaces which are either untreated or treated to render them measurably impermeable to volatiles. The surfaces are first exposed to a high concentration of a volatile fluid which is removed after a fixed time period. The surfaces are then exposed to an environment, e.g. a vacuum, to cause the volatile fluid to back-diffuse and the fluid that back-diffuses is measured. The rate at which the fluid back-diffuses from the untreated surface is considerably greater than that of the treated surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.