Blown film thickness gauge
US3988582A · kind A · utility
7Cited by
4References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1975 |
| Grant date | Oct 26, 1976 |
| Priority date | — |
| Expiry date | Aug 28, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/076
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for measuring the thickness of the plastic film of a blown film machine, making the measurement adjacent the extruder die without contacting the film. A radiation source and detector spaced from one side of the plastic film and a metal member spaced from the other side, with the detector receiving fluorescent x-rays from the metal member produced by source photons and receiving back scattered source photons from the film and the metal member, with both the fluorescent x-rays and the scattered photons producing indications of thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.