Granule application device and process
US4900589A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Sep 7, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05C19/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A granule application device for use in making a shingle roofing product is provided. This device includes a sheet having a weather protected headlap area and having a weather exposed butt area which moves continuously from an upstream end to a downstream end. The device includes a blender applicator which dispenses blended butt granules on the sticky, asphalt treated, upper surface of the sheet for covering the butt area only. The device also includes a headlap applicator which dispenses less expensive headlap granules on the headlap area only. The device also includes a recycle applicator, which dispenses recycle granules over the blended granules on the butt area only, and dispenses scrap granules over the headlap area only. The moving sheet is supported on a talc drum and a slate drum near the downstream end, and is supported on a back roll near the upstream end thereof. The manual control of the dispensing of the less expensive headlap granules, and the overall arrangement, reduces the percentage of more expensive blended granules in the recycled granules, thereby minimizing the overall cost of the shingle roofing product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.