System and method for reducing viscosity variations in roofing asphalt
US11186747B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 2019 |
| Grant date | Nov 30, 2021 |
| Priority date | — |
| Expiry date | Oct 11, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2555/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An asphalt shingle coating system that includes a coater, a mixer, a viscosity gauge, a wax supply, a wax pump and a control system. The coater applies a layer of a coating asphalt mixture on an asphalt shingle substrate. The mixer mixes the coating asphalt mixture and is positioned upstream of the coater. The viscosity gauge may be positioned between the coater and the mixer, and it measures the viscosity of said coating asphalt mixture before it is delivered to the coater. The wax supply is in fluid communication with the mixer and a wax pump may deliver a volume of wax from the wax supply to the mixer, and the control system may selectively adjust the operation of the wax pump to substantially maintain a desired viscosity of said coating asphalt mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.