Patent ID: 8632708
Filing Date: 2014-01-21
Classification: B29C,B29K,B29L,B32B,E04C,E06C,Y10T

Abstract:
1. A pultrusion method for making a ladder rail comprising the steps of: wetting an unimpregnated middle mat layer within a prewetting die with prewetting resin comprising filler; forming a seven-layer laminate by successively stacking unwet, unimpregnated top and bottom roving, mat, and veil layers onto the wet middle mat layer; compressing the seven-layer laminate so that said prewetting resin comprising filler from said wet middle mat layer fully saturates each of said roving layers and said middle mat layer; feeding the compressed laminate to a compacting impregnator compacting the compressed laminate while wetting only the top and bottom mat and veil layers with top coat resin; and forming a seven-layer ladder rail by passing the compacted laminate through a curing die at a rate of greater than 5 ft/min.