Patent ID: 8617699
Filing Date: 2013-12-31
Classification: B29C,B29D,B29K,B32B,E04C,E04D,Y10T

Abstract:
1. A method, comprising: providing a production line configured for continuous fabrication of polymer or predominantly polymer roofing boards by a setting and expansion of precursor materials on a conveyor; dispensing to the production line a first polymer or predominantly polymer material foam precursor; allowing the first foam precursor to rise and at least partially set to form a foam core layer for an insulation board, the foam core layer for the insulation board having a first density; dispensing to the production line a second polymer or predominantly polymer material foam precursor; and allowing the second foam precursor to rise and set to form a core layer for a cover board, the foam core layer for the cover board having a second density greater than the first density.