Method of converting asphalt composition roofing shingles into dimensional construction products
US6039914A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1998 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Apr 14, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/92
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Disclosed is a process of converting asphalt composition roofing shingles into dimensional construction products. Asphalt composition roofing shingles are de-consolidated, such as by grinding, into a crumble. The asphalt shingle crumble is processed in a manner to increase the fusibility activity of the asphalt without decomposing a substantial fractional amount of the asphalt to an ash-like brittleness. The foregoing can be achieved by heat exchange using infrared heaters as the heat source. One disclosed example trial of the process warmed the crumble to a bulk temperature of between about 130.degree. F. and 150.degree. F. Following that, the asphalt shingle crumble is compacted into the shape of a given dimensional construction product such as blocks, curbs, tiles, beams, posts, and so on. The best quality products are achieved by a two-step compaction process in which there occurs a certain time elapse between the two compaction steps. Hence the disclosed the process involves coordinating (i) the proper temperature range to raise the crumble to, against (ii) the proper compaction pressure(s) and time sequence in execution of the compaction step(s).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.